commit 8b29f3f3982ea931c65be1ad6a90c7fcea9d634d
parent a4ea9b423db655bb889f0be09aba993b10d930ec
Author: falkTX <falktx@gmail.com>
Date: Sat, 24 May 2014 00:59:31 +0100
Add NanoWidget class, exposes all NanoVG API :D
Diffstat:
10 files changed, 14160 insertions(+), 0 deletions(-)
diff --git a/dgl/Makefile b/dgl/Makefile
@@ -23,6 +23,7 @@ OBJS = \
src/ImageKnob.cpp.o \
src/ImageSlider.cpp.o \
src/ImageSwitch.cpp.o \
+ src/NanoWidget.cpp.o \
src/Widget.cpp.o
ifeq ($(MACOS),true)
diff --git a/dgl/NanoWidget.hpp b/dgl/NanoWidget.hpp
@@ -0,0 +1,765 @@
+/*
+ * DISTRHO Plugin Framework (DPF)
+ * Copyright (C) 2012-2014 Filipe Coelho <falktx@falktx.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any purpose with
+ * or without fee is hereby granted, provided that the above copyright notice and this
+ * permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+ * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef DGL_NANO_WIDGET_HPP_INCLUDED
+#define DGL_NANO_WIDGET_HPP_INCLUDED
+
+#include "Widget.hpp"
+
+struct NVGcolor;
+struct NVGcontext;
+struct NVGpaint;
+
+START_NAMESPACE_DGL
+
+// -----------------------------------------------------------------------
+
+/**
+ NanoVG Image class.
+
+ This implements NanoVG images as a C++ class where deletion is handled automatically.
+ Images need to be created within a NanoWidget class.
+ */
+class NanoImage
+{
+public:
+ /**
+ Destructor.
+ */
+ ~NanoImage();
+
+ /**
+ Get width.
+ */
+ int getWidth() const;
+
+ /**
+ Get height.
+ */
+ int getHeight() const;
+
+ /**
+ Get size.
+ */
+ Size<int> getSize() const;
+
+ /**
+ Update image data.
+ */
+ void updateImage(const uchar* data);
+
+protected:
+ /**
+ Constructors are protected.
+ NanoImages must be created within a NanoWidget class.
+ */
+ NanoImage(const char* filename);
+ NanoImage(uchar* data, int ndata);
+ NanoImage(int w, int h, const uchar* data);
+
+private:
+ NVGcontext* const fContext;
+ const int fImageId;
+ friend class NanoWidget;
+
+ DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(NanoImage)
+};
+
+// -----------------------------------------------------------------------
+
+/**
+ NanoVG Widget class.
+
+ This class implements the NanoVG drawing API inside a DGL Widget.
+ All calls should be wrapped in beginFrame() & endFrame().
+
+ @section Color utils
+ Colors in NanoVG are stored as uints in ABGR format.
+
+ @section State Handling
+ NanoVG contains state which represents how paths will be rendered.
+ The state contains transform, fill and stroke styles, text and font styles, and scissor clipping.
+
+ @section Render styles
+ Fill and stroke render style can be either a solid color or a paint which is a gradient or a pattern.
+ Solid color is simply defined as a color value, different kinds of paints can be created
+ using linearGradient(), boxGradient(), radialGradient() and imagePattern().
+
+ Current render style can be saved and restored using save() and restore().
+
+ @section Transforms
+ The paths, gradients, patterns and scissor region are transformed by an transformation
+ matrix at the time when they are passed to the API.
+ The current transformation matrix is a affine matrix:
+ [sx kx tx]
+ [ky sy ty]
+ [ 0 0 1]
+ Where: sx,sy define scaling, kx,ky skewing, and tx,ty translation.
+ The last row is assumed to be 0,0,1 and is not stored.
+
+ Apart from resetTransform(), each transformation function first creates
+ specific transformation matrix and pre-multiplies the current transformation by it.
+
+ Current coordinate system (transformation) can be saved and restored using save() and restore().
+
+ @section Images
+ NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering.
+ In addition you can upload your own image. The image loading is provided by stb_image.
+
+ @section Paints
+ NanoVG supports four types of paints: linear gradient, box gradient, radial gradient and image pattern.
+ These can be used as paints for strokes and fills.
+
+ @section Scissoring
+ Scissoring allows you to clip the rendering into a rectangle. This is useful for varius
+ user interface cases like rendering a text edit or a timeline.
+
+ @section Paths
+ Drawing a new shape starts with beginPath(), it clears all the currently defined paths.
+ Then you define one or more paths and sub-paths which describe the shape. The are functions
+ to draw common shapes like rectangles and circles, and lower level step-by-step functions,
+ which allow to define a path curve by curve.
+
+ NanoVG uses even-odd fill rule to draw the shapes. Solid shapes should have counter clockwise
+ winding and holes should have counter clockwise order. To specify winding of a path you can
+ call pathWinding(). This is useful especially for the common shapes, which are drawn CCW.
+
+ Finally you can fill the path using current fill style by calling fill(), and stroke it
+ with current stroke style by calling stroke().
+
+ The curve segments and sub-paths are transformed by the current transform.
+
+ @section Text
+ NanoVG allows you to load .ttf files and use the font to render text.
+
+ The appearance of the text can be defined by setting the current text style
+ and by specifying the fill color. Common text and font settings such as
+ font size, letter spacing and text align are supported. Font blur allows you
+ to create simple text effects such as drop shadows.
+
+ At render time the font face can be set based on the font handles or name.
+
+ Font measure functions return values in local space, the calculations are
+ carried in the same resolution as the final rendering. This is done because
+ the text glyph positions are snapped to the nearest pixels sharp rendering.
+
+ The local space means that values are not rotated or scale as per the current
+ transformation. For example if you set font size to 12, which would mean that
+ line height is 16, then regardless of the current scaling and rotation, the
+ returned line height is always 16. Some measures may vary because of the scaling
+ since aforementioned pixel snapping.
+
+ While this may sound a little odd, the setup allows you to always render the
+ same way regardless of scaling. I.e. following works regardless of scaling:
+
+ @code
+ const char* txt = "Text me up.";
+ textBounds(vg, x,y, txt, NULL, bounds);
+ beginPath(vg);
+ roundedRect(vg, bounds[0],bounds[1], bounds[2]-bounds[0], bounds[3]-bounds[1]);
+ fill(vg);
+ @endcode
+
+ Note: currently only solid color fill is supported for text.
+ */
+class NanoWidget : public Widget
+{
+public:
+ enum Align {
+ // Horizontal align
+ ALIGN_LEFT = 1 << 0, // Align horizontally to left (default).
+ ALIGN_CENTER = 1 << 1, // Align horizontally to center.
+ ALIGN_RIGHT = 1 << 2, // Align horizontally to right.
+ // Vertical align
+ ALIGN_TOP = 1 << 3, // Align vertically to top.
+ ALIGN_MIDDLE = 1 << 4, // Align vertically to middle.
+ ALIGN_BOTTOM = 1 << 5, // Align vertically to bottom.
+ ALIGN_BASELINE = 1 << 6 // Align vertically to baseline (default).
+ };
+
+ enum Alpha {
+ STRAIGHT_ALPHA,
+ PREMULTIPLIED_ALPHA,
+ };
+
+ enum LineCap {
+ BUTT,
+ ROUND,
+ SQUARE,
+ BEVEL,
+ MITER
+ };
+
+ enum PatternRepeat {
+ REPEAT_NONE = 0x0, // No repeat
+ REPEAT_X = 0x1, // Repeat in X direction
+ REPEAT_Y = 0x2 // Repeat in Y direction
+ };
+
+ enum Solidity {
+ SOLID = 1, // CCW
+ HOLE = 2 // CW
+ };
+
+ enum Winding {
+ CCW = 1, // Winding for solid shapes
+ CW = 2 // Winding for holes
+ };
+
+ struct Color {
+ union {
+ float rgba[4];
+ struct { float r,g,b,a; };
+ };
+
+ Color() noexcept;
+ Color(const NVGcolor&) noexcept;
+ operator NVGcolor() const noexcept;
+ };
+
+ struct Paint {
+ float xform[6];
+ float extent[2];
+ float radius;
+ float feather;
+ Color innerColor;
+ Color outerColor;
+ int imageId;
+ PatternRepeat repeat;
+
+ Paint() noexcept;
+ Paint(const NVGpaint&) noexcept;
+ operator NVGpaint() const noexcept;
+ };
+
+ struct GlyphPosition {
+ const char* str; // Position of the glyph in the input string.
+ float x; // The x-coordinate of the logical glyph position.
+ float minx, maxx; // The bounds of the glyph shape.
+ };
+
+ struct TextRow {
+ const char* start; // Pointer to the input text where the row starts.
+ const char* end; // Pointer to the input text where the row ends (one past the last character).
+ const char* next; // Pointer to the beginning of the next row.
+ float width; // Logical width of the row.
+ float minx, maxx; // Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending.
+ };
+
+ typedef int FontId;
+
+ /**
+ Constructor.
+ */
+ NanoWidget(Window& parent);
+
+ /**
+ Destructor.
+ */
+ ~NanoWidget() override;
+
+ /**
+ Get the NanoVG context.
+ You should not need this under normal circumstances.
+ */
+ NVGcontext* getContext() const noexcept
+ {
+ return fContext;
+ }
+
+protected:
+ /**
+ Begin drawing a new frame.
+ @param withAlha Controls if drawing the shapes to the render target should be done using straight or pre-multiplied alpha.
+ */
+ void beginFrame(Alpha alpha = PREMULTIPLIED_ALPHA);
+
+ /**
+ Ends drawing flushing remaining render state.
+ */
+ void endFrame();
+
+ /* --------------------------------------------------------------------
+ * Color utils */
+
+ /**
+ Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f).
+ */
+ static Color RGB(uchar r, uchar g, uchar b);
+
+ /**
+ Returns a color value from red, green, blue values. Alpha will be set to 1.0f.
+ */
+ static Color RGBf(float r, float g, float b);
+
+ /**
+ Returns a color value from red, green, blue and alpha values.
+ */
+ static Color RGBA(uchar r, uchar g, uchar b, uchar a);
+
+ /**
+ Returns a color value from red, green, blue and alpha values.
+ */
+ static Color RGBAf(float r, float g, float b, float a);
+
+ /**
+ Linearly interpolates from color c0 to c1, and returns resulting color value.
+ */
+ static Color lerpRGBA(const Color& c0, const Color& c1, float u);
+
+ /**
+ Returns color value specified by hue, saturation and lightness.
+ HSL values are all in range [0..1], alpha will be set to 255.
+ */
+ static Color HSL(float h, float s, float l);
+
+ /**
+ Returns color value specified by hue, saturation and lightness and alpha.
+ HSL values are all in range [0..1], alpha in range [0..255]
+ */
+ static Color HSLA(float h, float s, float l, uchar a);
+
+ /* --------------------------------------------------------------------
+ * State Handling */
+
+ /**
+ Pushes and saves the current render state into a state stack.
+ A matching restore() must be used to restore the state.
+ */
+ void save();
+
+ /**
+ Pops and restores current render state.
+ */
+ void restore();
+
+ /**
+ Resets current render state to default values. Does not affect the render state stack.
+ */
+ void reset();
+
+ /* --------------------------------------------------------------------
+ * Render styles */
+
+ /**
+ Sets current stroke style to a solid color.
+ */
+ void strokeColor(const Color& color);
+
+ /**
+ Sets current stroke style to a paint, which can be a one of the gradients or a pattern.
+ */
+ void strokePaint(const Paint& paint);
+
+ /**
+ Sets current fill style to a solid color.
+ */
+ void fillColor(const Color& color);
+
+ /**
+ Sets current fill style to a paint, which can be a one of the gradients or a pattern.
+ */
+ void fillPaint(const Paint& paint);
+
+ /**
+ Sets the miter limit of the stroke style.
+ Miter limit controls when a sharp corner is beveled.
+ */
+ void miterLimit(float limit);
+
+ /**
+ Sets the stroke width of the stroke style.
+ */
+ void strokeWidth(float size);
+
+ /**
+ Sets how the end of the line (cap) is drawn,
+ Can be one of: BUTT, ROUND, SQUARE.
+ */
+ void lineCap(LineCap cap = BUTT);
+
+ /**
+ Sets how sharp path corners are drawn.
+ Can be one of MITER, ROUND, BEVEL.
+ */
+ void lineJoin(LineCap join = MITER);
+
+ /* --------------------------------------------------------------------
+ * Transforms */
+
+ /**
+ Resets current transform to a identity matrix.
+ */
+ void resetTransform();
+
+ /**
+ Pre-multiplies current coordinate system by specified matrix.
+ The parameters are interpreted as matrix as follows:
+ [a c e]
+ [b d f]
+ [0 0 1]
+ */
+ void transform(float a, float b, float c, float d, float e, float f);
+
+ /**
+ Translates current coordinate system.
+ */
+ void translate(float x, float y);
+
+ /**
+ Rotates current coordinate system. Angle is specified in radians.
+ */
+ void rotate(float angle);
+
+ /**
+ Skews the current coordinate system along X axis. Angle is specified in radians.
+ */
+ void skewX(float angle);
+
+ /**
+ Skews the current coordinate system along Y axis. Angle is specified in radians.
+ */
+ void skewY(float angle);
+
+ /**
+ Scales the current coordinate system.
+ */
+ void scale(float x, float y);
+
+ /**
+ Stores the top part (a-f) of the current transformation matrix in to the specified buffer.
+ [a c e]
+ [b d f]
+ [0 0 1]
+ */
+ void currentTransform(float xform[6]);
+
+ /**
+ The following functions can be used to make calculations on 2x3 transformation matrices.
+ A 2x3 matrix is represented as float[6]. */
+
+ /**
+ Sets the transform to identity matrix.
+ */
+ static void transformIdentity(float dst[6]);
+
+ /**
+ Sets the transform to translation matrix matrix.
+ */
+ static void transformTranslate(float dst[6], float tx, float ty);
+
+ /**
+ Sets the transform to scale matrix.
+ */
+ static void transformScale(float dst[6], float sx, float sy);
+
+ /**
+ Sets the transform to rotate matrix. Angle is specified in radians.
+ */
+ static void transformRotate(float dst[6], float a);
+
+ /**
+ Sets the transform to skew-x matrix. Angle is specified in radians.
+ */
+ static void transformSkewX(float dst[6], float a);
+
+ /**
+ Sets the transform to skew-y matrix. Angle is specified in radians.
+ */
+ static void transformSkewY(float dst[6], float a);
+
+ /**
+ Sets the transform to the result of multiplication of two transforms, of A = A*B.
+ */
+ static void transformMultiply(float dst[6], const float src[6]);
+
+ /**
+ Sets the transform to the result of multiplication of two transforms, of A = B*A.
+ */
+ static void transformPremultiply(float dst[6], const float src[6]);
+
+ /**
+ Sets the destination to inverse of specified transform.
+ Returns 1 if the inverse could be calculated, else 0.
+ */
+ static int transformInverse(float dst[6], const float src[6]);
+
+ /**
+ Transform a point by given transform.
+ */
+ static void transformPoint(float& dstx, float& dsty, const float xform[6], float srcx, float srcy);
+
+ /**
+ Convert degrees to radians.
+ */
+ static float degToRad(float deg);
+
+ /**
+ Convert radians to degrees.
+ */
+ static float radToDeg(float rad);
+
+ /* --------------------------------------------------------------------
+ * Images */
+
+ /**
+ Creates image by loading it from the disk from specified file name.
+ */
+ NanoImage createImage(const char* filename);
+
+ /**
+ Creates image by loading it from the specified chunk of memory.
+ */
+ NanoImage createImageMem(uchar* data, int ndata);
+
+ /**
+ Creates image from specified image data.
+ */
+ NanoImage createImageRGBA(int w, int h, const uchar* data);
+
+ /* --------------------------------------------------------------------
+ * Paints */
+
+ /**
+ Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates
+ of the linear gradient, icol specifies the start color and ocol the end color.
+ The gradient is transformed by the current transform when it is passed to fillPaint() or strokePaint().
+ */
+ Paint linearGradient(float sx, float sy, float ex, float ey, const Color& icol, const Color& ocol);
+
+ /**
+ Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering
+ drop shadows or highlights for boxes. Parameters (x,y) define the top-left corner of the rectangle,
+ (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry
+ the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient.
+ The gradient is transformed by the current transform when it is passed to fillPaint() or strokePaint().
+ */
+ Paint boxGradient(float x, float y, float w, float h, float r, float f, const Color& icol, const Color& ocol);
+
+ /**
+ Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify
+ the inner and outer radius of the gradient, icol specifies the start color and ocol the end color.
+ The gradient is transformed by the current transform when it is passed to fillPaint() or strokePaint().
+ */
+ Paint radialGradient(float cx, float cy, float inr, float outr, const Color& icol, const Color& ocol);
+
+ /**
+ Creates and returns an image patter. Parameters (ox,oy) specify the left-top location of the image pattern,
+ (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render,
+ and repeat tells if the image should be repeated across x or y.
+ The gradient is transformed by the current transform when it is passed to fillPaint() or strokePaint().
+ */
+ Paint imagePattern(float ox, float oy, float ex, float ey, float angle, const NanoImage& image, PatternRepeat repeat);
+
+ /* --------------------------------------------------------------------
+ * Scissoring */
+
+ /**
+ Sets the current
+ The scissor rectangle is transformed by the current transform.
+ */
+ void scissor(float x, float y, float w, float h);
+
+ /**
+ Reset and disables scissoring.
+ */
+ void resetScissor();
+
+ /* --------------------------------------------------------------------
+ * Paths */
+
+ /**
+ Clears the current path and sub-paths.
+ */
+ void beginPath();
+
+ /**
+ Starts new sub-path with specified point as first point.
+ */
+ void moveTo(float x, float y);
+
+ /**
+ Adds line segment from the last point in the path to the specified point.
+ */
+ void lineTo(float x, float y);
+
+ /**
+ Adds bezier segment from last point in the path via two control points to the specified point.
+ */
+ void bezierTo(float c1x, float c1y, float c2x, float c2y, float x, float y);
+
+ /**
+ Adds an arc segment at the corner defined by the last path point, and two specified points.
+ */
+ void arcTo(float x1, float y1, float x2, float y2, float radius);
+
+ /**
+ Closes current sub-path with a line segment.
+ */
+ void closePath();
+
+ /**
+ Sets the current sub-path winding.
+ */
+ void pathWinding(Winding dir);
+
+ /**
+ Creates new arc shaped sub-path.
+ */
+ void arc(float cx, float cy, float r, float a0, float a1, Winding dir);
+
+ /**
+ Creates new rectangle shaped sub-path.
+ */
+ void rect(float x, float y, float w, float h);
+
+ /**
+ Creates new rounded rectangle shaped sub-path.
+ */
+ void roundedRect(float x, float y, float w, float h, float r);
+
+ /**
+ Creates new ellipse shaped sub-path.
+ */
+ void ellipse(float cx, float cy, float rx, float ry);
+
+ /**
+ Creates new circle shaped sub-path.
+ */
+ void circle(float cx, float cy, float r);
+
+ /**
+ Fills the current path with current fill style.
+ */
+ void fill();
+
+ /**
+ Fills the current path with current stroke style.
+ */
+ void stroke();
+
+ /* --------------------------------------------------------------------
+ * Text */
+
+ /**
+ Creates font by loading it from the disk from specified file name.
+ Returns handle to the font.
+ */
+ FontId createFont(const char* name, const char* filename);
+
+ /**
+ Creates font by loading it from the specified memory chunk.
+ Returns handle to the font.
+ */
+ FontId createFontMem(const char* name, uchar* data, int ndata, bool freeData);
+
+ /**
+ Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found.
+ */
+ FontId findFont(const char* name);
+
+ /**
+ Sets the font size of current text style.
+ */
+ void fontSize(float size);
+
+ /**
+ Sets the blur of current text style.
+ */
+ void fontBlur(float blur);
+
+ /**
+ Sets the letter spacing of current text style.
+ */
+ void textLetterSpacing(float spacing);
+
+ /**
+ Sets the proportional line height of current text style. The line height is specified as multiple of font size.
+ */
+ void textLineHeight(float lineHeight);
+
+ /**
+ Sets the text align of current text style.
+ */
+ void textAlign(Align align);
+
+ /**
+ Sets the font face based on specified id of current text style.
+ */
+ void fontFaceId(FontId font);
+
+ /**
+ Sets the font face based on specified name of current text style.
+ */
+ void fontFace(const char* font);
+
+ /**
+ Draws text string at specified location. If end is specified only the sub-string up to the end is drawn.
+ */
+ float text(float x, float y, const char* string, const char* end);
+
+ /**
+ Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn.
+ White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+ Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+ */
+ void textBox(float x, float y, float breakRowWidth, const char* string, const char* end);
+
+ /**
+ Measures the specified text string. Parameter bounds should be a pointer to float[4],
+ if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+ Returns the horizontal advance of the measured text (i.e. where the next character should drawn).
+ Measured values are returned in local coordinate space.
+ */
+ float textBounds(float x, float y, const char* string, const char* end, float* bounds);
+
+ /**
+ Measures the specified multi-text string. Parameter bounds should be a pointer to float[4],
+ if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+ Measured values are returned in local coordinate space.
+ */
+ void textBoxBounds(float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds);
+
+ /**
+ Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used.
+ Measured values are returned in local coordinate space.
+ */
+ int textGlyphPositions(float x, float y, const char* string, const char* end, GlyphPosition* positions, int maxPositions);
+
+ /**
+ Returns the vertical metrics based on the current text style.
+ Measured values are returned in local coordinate space.
+ */
+ void textMetrics(float* ascender, float* descender, float* lineh);
+
+ /**
+ Breaks the specified text into lines. If end is specified only the sub-string will be used.
+ White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+ Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+ */
+ int textBreakLines(const char* string, const char* end, float breakRowWidth, TextRow* rows, int maxRows);
+
+private:
+ NVGcontext* fContext;
+
+ DISTRHO_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(NanoWidget)
+};
+
+// -----------------------------------------------------------------------
+
+END_NAMESPACE_DGL
+
+#endif // DGL_NANO_WIDGET_HPP_INCLUDED
diff --git a/dgl/src/NanoWidget.cpp b/dgl/src/NanoWidget.cpp
@@ -0,0 +1,590 @@
+/*
+ * DISTRHO Plugin Framework (DPF)
+ * Copyright (C) 2012-2014 Filipe Coelho <falktx@falktx.com>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any purpose with
+ * or without fee is hereby granted, provided that the above copyright notice and this
+ * permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD
+ * TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN
+ * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
+ * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER
+ * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
+ * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include "../NanoWidget.hpp"
+
+// -----------------------------------------------------------------------
+
+#define NANOVG_GL2_IMPLEMENTATION
+#include "nanovg/nanovg_gl.h"
+
+#if defined(NANOVG_GL2)
+# define nvgCreateGL nvgCreateGL2
+# define nvgDeleteGL nvgDeleteGL2
+#elif defined(NANOVG_GL3)
+# define nvgCreateGL nvgCreateGL3
+# define nvgDeleteGL nvgDeleteGL3
+#elif defined(NANOVG_GLES2)
+# define nvgCreateGL nvgCreateGLES2
+# define nvgDeleteGL nvgDeleteGLES2
+#elif defined(NANOVG_GLES3)
+# define nvgCreateGL nvgCreateGLES3
+# define nvgDeleteGL nvgDeleteGLES3
+#endif
+
+START_NAMESPACE_DGL
+
+// -----------------------------------------------------------------------
+// Conversions
+
+NanoWidget::Color::Color() noexcept
+ : r(1.0f), g(1.0f), b(1.0f), a(1.0f) {}
+
+NanoWidget::Color::Color(const NVGcolor& c) noexcept
+ : r(c.r), g(c.g), b(c.b), a(c.a) {}
+
+NanoWidget::Color::operator NVGcolor() const noexcept
+{
+ NVGcolor nc = { r, g, b, a };
+ return nc;
+}
+
+NanoWidget::Paint::Paint() noexcept
+ : radius(0.0f), feather(0.0f), innerColor(), outerColor(), imageId(0), repeat(REPEAT_NONE)
+{
+ std::memset(xform, 0, sizeof(float)*6);
+ std::memset(extent, 0, sizeof(float)*2);
+}
+
+NanoWidget::Paint::Paint(const NVGpaint& p) noexcept
+ : radius(p.radius), feather(p.feather), innerColor(p.innerColor), outerColor(p.outerColor), imageId(p.image), repeat(static_cast<PatternRepeat>(p.repeat))
+{
+ std::memcpy(xform, p.xform, sizeof(float)*6);
+ std::memcpy(extent, p.extent, sizeof(float)*2);
+}
+
+NanoWidget::Paint::operator NVGpaint() const noexcept
+{
+ NVGpaint p;
+ p.radius = radius;
+ p.feather = feather;
+ p.innerColor = innerColor;
+ p.outerColor = outerColor;
+ p.image = imageId;
+ p.repeat = repeat;
+ std::memcpy(p.xform, xform, sizeof(float)*6);
+ std::memcpy(p.extent, extent, sizeof(float)*2);
+ return p;
+}
+
+// -----------------------------------------------------------------------
+// NanoImage
+
+static NVGcontext* sLastContext = nullptr;
+
+NanoImage::NanoImage(const char* filename)
+ : fContext(sLastContext),
+ fImageId((fContext != nullptr) ? nvgCreateImage(fContext, filename) : 0) {}
+
+NanoImage::NanoImage(uchar* data, int ndata)
+ : fContext(sLastContext),
+ fImageId((fContext != nullptr) ? nvgCreateImageMem(fContext, data, ndata) : 0) {}
+
+NanoImage::NanoImage(int w, int h, const uchar* data)
+ : fContext(sLastContext),
+ fImageId((fContext != nullptr) ? nvgCreateImageRGBA(fContext, w, h, data) : 0) {}
+
+NanoImage::~NanoImage()
+{
+ if (fContext != nullptr && fImageId != 0)
+ nvgDeleteImage(fContext, fImageId);
+}
+
+int NanoImage::getWidth() const
+{
+ return getSize().getWidth();
+}
+
+int NanoImage::getHeight() const
+{
+ return getSize().getHeight();
+}
+
+Size<int> NanoImage::getSize() const
+{
+ int w=0, h=0;
+
+ if (fContext != nullptr && fImageId != 0)
+ nvgImageSize(fContext, fImageId, &w, &h);
+
+ return Size<int>(w, h);
+}
+
+void NanoImage::updateImage(const uchar* data)
+{
+ if (fContext != nullptr && fImageId != 0)
+ nvgUpdateImage(fContext, fImageId, data);
+}
+
+// -----------------------------------------------------------------------
+// NanoWidget
+
+NanoWidget::NanoWidget(Window& parent)
+ : Widget(parent),
+ fContext(nvgCreateGL(512, 512, NVG_ANTIALIAS))
+{
+ DISTRHO_SAFE_ASSERT_RETURN(fContext != nullptr,);
+}
+
+NanoWidget::~NanoWidget()
+{
+ if (fContext == nullptr)
+ return;
+
+ nvgDeleteGL(fContext);
+}
+
+// -----------------------------------------------------------------------
+
+void NanoWidget::beginFrame(Alpha alpha)
+{
+ nvgBeginFrame(fContext, getWidth(), getHeight(), 1.0f, static_cast<NVGalpha>(alpha));
+}
+
+void NanoWidget::endFrame()
+{
+ nvgEndFrame(fContext);
+}
+
+// -----------------------------------------------------------------------
+// Color utils
+
+NanoWidget::Color NanoWidget::RGB(uchar r, uchar g, uchar b)
+{
+ return nvgRGB(r, g, b);
+}
+
+NanoWidget::Color NanoWidget::RGBf(float r, float g, float b)
+{
+ return nvgRGBf(r, g, b);
+}
+
+NanoWidget::Color NanoWidget::RGBA(uchar r, uchar g, uchar b, uchar a)
+{
+ return nvgRGBA(r, g, b, a);
+}
+
+NanoWidget::Color NanoWidget::RGBAf(float r, float g, float b, float a)
+{
+ return nvgRGBAf(r, g, b, a);
+}
+
+NanoWidget::Color NanoWidget::lerpRGBA(const Color& c0, const Color& c1, float u)
+{
+ return nvgLerpRGBA(c0, c1, u);
+}
+
+NanoWidget::Color NanoWidget::HSL(float h, float s, float l)
+{
+ return nvgHSL(h, s, l);
+}
+
+NanoWidget::Color NanoWidget::HSLA(float h, float s, float l, uchar a)
+{
+ return nvgHSLA(h, s, l, a);
+}
+
+// -----------------------------------------------------------------------
+// State Handling
+
+void NanoWidget::save()
+{
+ nvgSave(fContext);
+}
+
+void NanoWidget::restore()
+{
+ nvgRestore(fContext);
+}
+
+void NanoWidget::reset()
+{
+ nvgReset(fContext);
+}
+
+// -----------------------------------------------------------------------
+// Render styles
+
+void NanoWidget::strokeColor(const Color& color)
+{
+ nvgStrokeColor(fContext, color);
+}
+
+void NanoWidget::strokePaint(const Paint& paint)
+{
+ nvgStrokePaint(fContext, paint);
+}
+
+void NanoWidget::fillColor(const Color& color)
+{
+ nvgFillColor(fContext, color);
+}
+
+void NanoWidget::fillPaint(const Paint& paint)
+{
+ nvgFillPaint(fContext, paint);
+}
+
+void NanoWidget::miterLimit(float limit)
+{
+ nvgMiterLimit(fContext, limit);
+}
+
+void NanoWidget::strokeWidth(float size)
+{
+ nvgStrokeWidth(fContext, size);
+}
+
+void NanoWidget::lineCap(NanoWidget::LineCap cap)
+{
+ nvgLineCap(fContext, cap);
+}
+
+void NanoWidget::lineJoin(NanoWidget::LineCap join)
+{
+ nvgLineJoin(fContext, join);
+}
+
+// -----------------------------------------------------------------------
+// Transforms
+
+void NanoWidget::resetTransform()
+{
+ nvgResetTransform(fContext);
+}
+
+void NanoWidget::transform(float a, float b, float c, float d, float e, float f)
+{
+ nvgTransform(fContext, a, b, c, d, e, f);
+}
+
+void NanoWidget::translate(float x, float y)
+{
+ nvgTranslate(fContext, x, y);
+}
+
+void NanoWidget::rotate(float angle)
+{
+ nvgRotate(fContext, angle);
+}
+
+void NanoWidget::skewX(float angle)
+{
+ nvgSkewX(fContext, angle);
+}
+
+void NanoWidget::skewY(float angle)
+{
+ nvgSkewY(fContext, angle);
+}
+
+void NanoWidget::scale(float x, float y)
+{
+ nvgScale(fContext, x, y);
+}
+
+void NanoWidget::currentTransform(float xform[6])
+{
+ nvgCurrentTransform(fContext, xform);
+}
+
+void NanoWidget::transformIdentity(float dst[6])
+{
+ nvgTransformIdentity(dst);
+}
+
+void NanoWidget::transformTranslate(float dst[6], float tx, float ty)
+{
+ nvgTransformTranslate(dst, tx, ty);
+}
+
+void NanoWidget::transformScale(float dst[6], float sx, float sy)
+{
+ nvgTransformScale(dst, sx, sy);
+}
+
+void NanoWidget::transformRotate(float dst[6], float a)
+{
+ nvgTransformRotate(dst, a);
+}
+
+void NanoWidget::transformSkewX(float dst[6], float a)
+{
+ nvgTransformSkewX(dst, a);
+}
+
+void NanoWidget::transformSkewY(float dst[6], float a)
+{
+ nvgTransformSkewY(dst, a);
+}
+
+void NanoWidget::transformMultiply(float dst[6], const float src[6])
+{
+ nvgTransformMultiply(dst, src);
+}
+
+void NanoWidget::transformPremultiply(float dst[6], const float src[6])
+{
+ nvgTransformPremultiply(dst, src);
+}
+
+int NanoWidget::transformInverse(float dst[6], const float src[6])
+{
+ return nvgTransformInverse(dst, src);
+}
+
+void NanoWidget::transformPoint(float& dstx, float& dsty, const float xform[6], float srcx, float srcy)
+{
+ nvgTransformPoint(&dstx, &dsty, xform, srcx, srcy);
+}
+
+float NanoWidget::degToRad(float deg)
+{
+ return nvgDegToRad(deg);
+}
+
+float NanoWidget::radToDeg(float rad)
+{
+ return nvgRadToDeg(rad);
+}
+
+// -----------------------------------------------------------------------
+// Images
+
+NanoImage NanoWidget::createImage(const char* filename)
+{
+ sLastContext = fContext;
+ return NanoImage(filename);
+}
+
+NanoImage NanoWidget::createImageMem(uchar* data, int ndata)
+{
+ sLastContext = fContext;
+ return NanoImage(data, ndata);
+}
+
+NanoImage NanoWidget::createImageRGBA(int w, int h, const uchar* data)
+{
+ sLastContext = fContext;
+ return NanoImage(w, h, data);
+}
+
+// -----------------------------------------------------------------------
+// Paints
+
+NanoWidget::Paint NanoWidget::linearGradient(float sx, float sy, float ex, float ey, const NanoWidget::Color& icol, const NanoWidget::Color& ocol)
+{
+ return nvgLinearGradient(fContext, sx, sy, ex, ey, icol, ocol);
+}
+
+NanoWidget::Paint NanoWidget::boxGradient(float x, float y, float w, float h, float r, float f, const NanoWidget::Color& icol, const NanoWidget::Color& ocol)
+{
+ return nvgBoxGradient(fContext, x, y, w, h, r, f, icol, ocol);
+}
+
+NanoWidget::Paint NanoWidget::radialGradient(float cx, float cy, float inr, float outr, const NanoWidget::Color& icol, const NanoWidget::Color& ocol)
+{
+ return nvgRadialGradient(fContext, cx, cy, inr, outr, icol, ocol);
+}
+
+NanoWidget::Paint NanoWidget::imagePattern(float ox, float oy, float ex, float ey, float angle, const NanoImage& image, NanoWidget::PatternRepeat repeat)
+{
+ return nvgImagePattern(fContext, ox, oy, ex, ey, angle, image.fImageId, repeat);
+}
+
+// -----------------------------------------------------------------------
+// Scissoring
+
+void NanoWidget::scissor(float x, float y, float w, float h)
+{
+ nvgScissor(fContext, x, y, w, h);
+}
+
+void NanoWidget::resetScissor()
+{
+ nvgResetScissor(fContext);
+}
+
+// -----------------------------------------------------------------------
+// Paths
+
+void NanoWidget::beginPath()
+{
+ nvgBeginPath(fContext);
+}
+
+void NanoWidget::moveTo(float x, float y)
+{
+ nvgMoveTo(fContext, x, y);
+}
+
+void NanoWidget::lineTo(float x, float y)
+{
+ nvgLineTo(fContext, x, y);
+}
+
+void NanoWidget::bezierTo(float c1x, float c1y, float c2x, float c2y, float x, float y)
+{
+ nvgBezierTo(fContext, c1x, c1y, c2x, c2y, x, y);
+}
+
+void NanoWidget::arcTo(float x1, float y1, float x2, float y2, float radius)
+{
+ nvgArcTo(fContext, x1, y1, x2, y2, radius);
+}
+
+void NanoWidget::closePath()
+{
+ nvgClosePath(fContext);
+}
+
+void NanoWidget::pathWinding(NanoWidget::Winding dir)
+{
+ nvgPathWinding(fContext, dir);
+}
+
+void NanoWidget::arc(float cx, float cy, float r, float a0, float a1, NanoWidget::Winding dir)
+{
+ nvgArc(fContext, cx, cy, r, a0, a1, dir);
+}
+
+void NanoWidget::rect(float x, float y, float w, float h)
+{
+ nvgRect(fContext, x, y, w, h);
+}
+
+void NanoWidget::roundedRect(float x, float y, float w, float h, float r)
+{
+ nvgRoundedRect(fContext, x, y, w, h, r);
+}
+
+void NanoWidget::ellipse(float cx, float cy, float rx, float ry)
+{
+ nvgEllipse(fContext, cx, cy, rx, ry);
+}
+
+void NanoWidget::circle(float cx, float cy, float r)
+{
+ nvgCircle(fContext, cx, cy, r);
+}
+
+void NanoWidget::fill()
+{
+ nvgFill(fContext);
+}
+
+void NanoWidget::stroke()
+{
+ nvgStroke(fContext);
+}
+
+// -----------------------------------------------------------------------
+// Text
+
+NanoWidget::FontId NanoWidget::createFont(const char* name, const char* filename)
+{
+ return nvgCreateFont(fContext, name, filename);
+}
+
+NanoWidget::FontId NanoWidget::createFontMem(const char* name, uchar* data, int ndata, bool freeData)
+{
+ return nvgCreateFontMem(fContext, name, data, ndata, freeData);
+}
+
+NanoWidget::FontId NanoWidget::findFont(const char* name)
+{
+ return nvgFindFont(fContext, name);
+}
+
+void NanoWidget::fontSize(float size)
+{
+ nvgFontSize(fContext, size);
+}
+
+void NanoWidget::fontBlur(float blur)
+{
+ nvgFontBlur(fContext, blur);
+}
+
+void NanoWidget::textLetterSpacing(float spacing)
+{
+ nvgTextLetterSpacing(fContext, spacing);
+}
+
+void NanoWidget::textLineHeight(float lineHeight)
+{
+ nvgTextLineHeight(fContext, lineHeight);
+}
+
+void NanoWidget::textAlign(NanoWidget::Align align)
+{
+ nvgTextAlign(fContext, align);
+}
+
+void NanoWidget::fontFaceId(FontId font)
+{
+ nvgFontFaceId(fContext, font);
+}
+
+void NanoWidget::fontFace(const char* font)
+{
+ nvgFontFace(fContext, font);
+}
+
+float NanoWidget::text(float x, float y, const char* string, const char* end)
+{
+ return nvgText(fContext, x, y, string, end);
+}
+
+void NanoWidget::textBox(float x, float y, float breakRowWidth, const char* string, const char* end)
+{
+ nvgTextBox(fContext, x, y, breakRowWidth, string, end);
+}
+
+float NanoWidget::textBounds(float x, float y, const char* string, const char* end, float* bounds)
+{
+ return nvgTextBounds(fContext, x, y, string, end, bounds);
+}
+
+void NanoWidget::textBoxBounds(float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds)
+{
+ nvgTextBoxBounds(fContext, x, y, breakRowWidth, string, end, bounds);
+}
+
+int NanoWidget::textGlyphPositions(float x, float y, const char* string, const char* end, NanoWidget::GlyphPosition* positions, int maxPositions)
+{
+ return nvgTextGlyphPositions(fContext, x, y, string, end, (NVGglyphPosition*)positions, maxPositions);
+}
+
+void NanoWidget::textMetrics(float* ascender, float* descender, float* lineh)
+{
+ nvgTextMetrics(fContext, ascender, descender, lineh);
+}
+
+int NanoWidget::textBreakLines(const char* string, const char* end, float breakRowWidth, NanoWidget::TextRow* rows, int maxRows)
+{
+ return nvgTextBreakLines(fContext, string, end, breakRowWidth, (NVGtextRow*)rows, maxRows);
+}
+
+// -----------------------------------------------------------------------
+
+END_NAMESPACE_DGL
+
+extern "C" {
+#include "nanovg/nanovg.c"
+}
+
+// -----------------------------------------------------------------------
diff --git a/dgl/src/nanovg/LICENSE.txt b/dgl/src/nanovg/LICENSE.txt
@@ -0,0 +1,18 @@
+Copyright (c) 2013 Mikko Mononen memon@inside.org
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+claim that you wrote the original software. If you use this software
+in a product, an acknowledgment in the product documentation would be
+appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.
+
diff --git a/dgl/src/nanovg/fontstash.h b/dgl/src/nanovg/fontstash.h
@@ -0,0 +1,1670 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#ifndef FONS_H
+#define FONS_H
+
+#define FONS_INVALID -1
+
+enum FONSflags {
+ FONS_ZERO_TOPLEFT = 1,
+ FONS_ZERO_BOTTOMLEFT = 2,
+};
+
+enum FONSalign {
+ // Horizontal align
+ FONS_ALIGN_LEFT = 1<<0, // Default
+ FONS_ALIGN_CENTER = 1<<1,
+ FONS_ALIGN_RIGHT = 1<<2,
+ // Vertical align
+ FONS_ALIGN_TOP = 1<<3,
+ FONS_ALIGN_MIDDLE = 1<<4,
+ FONS_ALIGN_BOTTOM = 1<<5,
+ FONS_ALIGN_BASELINE = 1<<6, // Default
+};
+
+enum FONSerrorCode {
+ // Font atlas is full.
+ FONS_ATLAS_FULL = 1,
+ // Scratch memory used to render glyphs is full, requested size reported in 'val', you may need to bump up FONS_SCRATCH_BUF_SIZE.
+ FONS_SCRATCH_FULL = 2,
+ // Calls to fonsPushState has craeted too large stack, if you need deep state stack bump up FONS_MAX_STATES.
+ FONS_STATES_OVERFLOW = 3,
+ // Trying to pop too many states fonsPopState().
+ FONS_STATES_UNDERFLOW = 4,
+};
+
+struct FONSparams {
+ int width, height;
+ unsigned char flags;
+ void* userPtr;
+ int (*renderCreate)(void* uptr, int width, int height);
+ int (*renderResize)(void* uptr, int width, int height);
+ void (*renderUpdate)(void* uptr, int* rect, const unsigned char* data);
+ void (*renderDraw)(void* uptr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts);
+ void (*renderDelete)(void* uptr);
+};
+
+struct FONSquad
+{
+ float x0,y0,s0,t0;
+ float x1,y1,s1,t1;
+};
+
+struct FONStextIter {
+ float x, y, nextx, nexty, scale, spacing;
+ unsigned int codepoint;
+ short isize, iblur;
+ struct FONSfont* font;
+ struct FONSglyph* prevGlyph;
+ const char* str;
+ const char* next;
+ const char* end;
+ unsigned int utf8state;
+};
+
+// Contructor and destructor.
+struct FONScontext* fonsCreateInternal(struct FONSparams* params);
+void fonsDeleteInternal(struct FONScontext* s);
+
+void fonsSetErrorCallback(struct FONScontext* s, void (*callback)(void* uptr, int error, int val), void* uptr);
+// Returns current atlas size.
+void fonsGetAtlasSize(struct FONScontext* s, int* width, int* height);
+// Expands the atlas size.
+int fonsExpandAtlas(struct FONScontext* s, int width, int height);
+// Reseta the whole stash.
+int fonsResetAtlas(struct FONScontext* stash, int width, int height);
+
+// Add fonts
+int fonsAddFont(struct FONScontext* s, const char* name, const char* path);
+int fonsAddFontMem(struct FONScontext* s, const char* name, unsigned char* data, int ndata, int freeData);
+int fonsGetFontByName(struct FONScontext* s, const char* name);
+
+// State handling
+void fonsPushState(struct FONScontext* s);
+void fonsPopState(struct FONScontext* s);
+void fonsClearState(struct FONScontext* s);
+
+// State setting
+void fonsSetSize(struct FONScontext* s, float size);
+void fonsSetColor(struct FONScontext* s, unsigned int color);
+void fonsSetSpacing(struct FONScontext* s, float spacing);
+void fonsSetBlur(struct FONScontext* s, float blur);
+void fonsSetAlign(struct FONScontext* s, int align);
+void fonsSetFont(struct FONScontext* s, int font);
+
+// Draw text
+float fonsDrawText(struct FONScontext* s, float x, float y, const char* string, const char* end);
+
+// Measure text
+float fonsTextBounds(struct FONScontext* s, float x, float y, const char* string, const char* end, float* bounds);
+void fonsLineBounds(struct FONScontext* s, float y, float* miny, float* maxy);
+void fonsVertMetrics(struct FONScontext* s, float* ascender, float* descender, float* lineh);
+
+// Text iterator
+int fonsTextIterInit(struct FONScontext* stash, struct FONStextIter* iter, float x, float y, const char* str, const char* end);
+int fonsTextIterNext(struct FONScontext* stash, struct FONStextIter* iter, struct FONSquad* quad);
+
+// Pull texture changes
+const unsigned char* fonsGetTextureData(struct FONScontext* stash, int* width, int* height);
+int fonsValidateTexture(struct FONScontext* s, int* dirty);
+
+// Draws the stash texture for debugging
+void fonsDrawDebug(struct FONScontext* s, float x, float y);
+
+#endif // FONS_H
+
+
+#ifdef FONTSTASH_IMPLEMENTATION
+
+#define FONS_NOTUSED(v) (void)sizeof(v)
+
+#ifdef FONS_USE_FREETYPE
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_ADVANCES_H
+#include <math.h>
+
+struct FONSttFontImpl {
+ FT_Face font;
+};
+
+static FT_Library ftLibrary;
+
+int fons__tt_init()
+{
+ FT_Error ftError;
+ ftError = FT_Init_FreeType(&ftLibrary);
+ return ftError == 0;
+}
+
+int fons__tt_loadFont(struct FONScontext *context, struct FONSttFontImpl *font, unsigned char *data, int dataSize)
+{
+ FT_Error ftError;
+ FONS_NOTUSED(context);
+
+ //font->font.userdata = stash;
+ ftError = FT_New_Memory_Face(ftLibrary, (const FT_Byte*)data, dataSize, 0, &font->font);
+ return ftError == 0;
+}
+
+void fons__tt_getFontVMetrics(struct FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
+{
+ *ascent = font->font->ascender;
+ *descent = font->font->descender;
+ *lineGap = font->font->height - (*ascent - *descent);
+}
+
+float fons__tt_getPixelHeightScale(struct FONSttFontImpl *font, float size)
+{
+ return size / (font->font->ascender - font->font->descender);
+}
+
+int fons__tt_getGlyphIndex(struct FONSttFontImpl *font, int codepoint)
+{
+ return FT_Get_Char_Index(font->font, codepoint);
+}
+
+int fons__tt_buildGlyphBitmap(struct FONSttFontImpl *font, int glyph, float size, float scale, int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
+{
+ FT_Error ftError;
+ FT_GlyphSlot ftGlyph;
+ FONS_NOTUSED(scale);
+
+ ftError = FT_Set_Pixel_Sizes(font->font, 0, (FT_UInt)(size * (float)font->font->units_per_EM / (float)(font->font->ascender - font->font->descender)));
+ if (ftError) return 0;
+ ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER);
+ if (ftError) return 0;
+ ftError = FT_Get_Advance(font->font, glyph, FT_LOAD_NO_SCALE, (FT_Fixed*)advance);
+ if (ftError) return 0;
+ ftGlyph = font->font->glyph;
+ *lsb = ftGlyph->metrics.horiBearingX;
+ *x0 = ftGlyph->bitmap_left;
+ *x1 = *x0 + ftGlyph->bitmap.width;
+ *y0 = -ftGlyph->bitmap_top;
+ *y1 = *y0 + ftGlyph->bitmap.rows;
+ return 1;
+}
+
+void fons__tt_renderGlyphBitmap(struct FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride, float scaleX, float scaleY, int glyph)
+{
+ FT_GlyphSlot ftGlyph = font->font->glyph;
+ int ftGlyphOffset = 0;
+ int x, y;
+ FONS_NOTUSED(outWidth);
+ FONS_NOTUSED(outHeight);
+ FONS_NOTUSED(scaleX);
+ FONS_NOTUSED(scaleY);
+ FONS_NOTUSED(glyph); // glyph has already been loaded by fons__tt_buildGlyphBitmap
+
+ for ( y = 0; y < ftGlyph->bitmap.rows; y++ ) {
+ for ( x = 0; x < ftGlyph->bitmap.width; x++ ) {
+ output[(y * outStride) + x] = ftGlyph->bitmap.buffer[ftGlyphOffset++];
+ }
+ }
+}
+
+int fons__tt_getGlyphKernAdvance(struct FONSttFontImpl *font, int glyph1, int glyph2)
+{
+ FT_Vector ftKerning;
+ FT_Get_Kerning(font->font, glyph1, glyph2, FT_KERNING_DEFAULT, &ftKerning);
+ return ftKerning.x;
+}
+
+#else
+
+#define STB_TRUETYPE_IMPLEMENTATION
+static void* fons__tmpalloc(size_t size, void* up);
+static void fons__tmpfree(void* ptr, void* up);
+#define STBTT_malloc(x,u) fons__tmpalloc(x,u)
+#define STBTT_free(x,u) fons__tmpfree(x,u)
+#include "stb_truetype.h"
+
+struct FONSttFontImpl {
+ stbtt_fontinfo font;
+};
+
+int fons__tt_init(struct FONScontext *context)
+{
+ FONS_NOTUSED(context);
+ return 1;
+}
+
+int fons__tt_loadFont(struct FONScontext *context, struct FONSttFontImpl *font, unsigned char *data, int dataSize)
+{
+ int stbError;
+ FONS_NOTUSED(dataSize);
+
+ font->font.userdata = context;
+ stbError = stbtt_InitFont(&font->font, data, 0);
+ return stbError;
+}
+
+void fons__tt_getFontVMetrics(struct FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
+{
+ stbtt_GetFontVMetrics(&font->font, ascent, descent, lineGap);
+}
+
+float fons__tt_getPixelHeightScale(struct FONSttFontImpl *font, float size)
+{
+ return stbtt_ScaleForPixelHeight(&font->font, size);
+}
+
+int fons__tt_getGlyphIndex(struct FONSttFontImpl *font, int codepoint)
+{
+ return stbtt_FindGlyphIndex(&font->font, codepoint);
+}
+
+int fons__tt_buildGlyphBitmap(struct FONSttFontImpl *font, int glyph, float size, float scale, int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
+{
+ FONS_NOTUSED(size);
+ stbtt_GetGlyphHMetrics(&font->font, glyph, advance, lsb);
+ stbtt_GetGlyphBitmapBox(&font->font, glyph, scale, scale, x0, y0, x1, y1);
+ return 1;
+}
+
+void fons__tt_renderGlyphBitmap(struct FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride, float scaleX, float scaleY, int glyph)
+{
+ stbtt_MakeGlyphBitmap(&font->font, output, outWidth, outHeight, outStride, scaleX, scaleY, glyph);
+}
+
+int fons__tt_getGlyphKernAdvance(struct FONSttFontImpl *font, int glyph1, int glyph2)
+{
+ return stbtt_GetGlyphKernAdvance(&font->font, glyph1, glyph2);
+}
+
+#endif
+
+#ifndef FONS_SCRATCH_BUF_SIZE
+# define FONS_SCRATCH_BUF_SIZE 16000
+#endif
+#ifndef FONS_HASH_LUT_SIZE
+# define FONS_HASH_LUT_SIZE 256
+#endif
+#ifndef FONS_INIT_FONTS
+# define FONS_INIT_FONTS 4
+#endif
+#ifndef FONS_INIT_GLYPHS
+# define FONS_INIT_GLYPHS 256
+#endif
+#ifndef FONS_INIT_ATLAS_NODES
+# define FONS_INIT_ATLAS_NODES 256
+#endif
+#ifndef FONS_VERTEX_COUNT
+# define FONS_VERTEX_COUNT 1024
+#endif
+#ifndef FONS_MAX_STATES
+# define FONS_MAX_STATES 20
+#endif
+
+static unsigned int fons__hashint(unsigned int a)
+{
+ a += ~(a<<15);
+ a ^= (a>>10);
+ a += (a<<3);
+ a ^= (a>>6);
+ a += ~(a<<11);
+ a ^= (a>>16);
+ return a;
+}
+
+static int fons__mini(int a, int b)
+{
+ return a < b ? a : b;
+}
+
+static int fons__maxi(int a, int b)
+{
+ return a > b ? a : b;
+}
+
+struct FONSglyph
+{
+ unsigned int codepoint;
+ int index;
+ int next;
+ short size, blur;
+ short x0,y0,x1,y1;
+ short xadv,xoff,yoff;
+};
+
+struct FONSfont
+{
+ struct FONSttFontImpl font;
+ char name[64];
+ unsigned char* data;
+ int dataSize;
+ unsigned char freeData;
+ float ascender;
+ float descender;
+ float lineh;
+ struct FONSglyph* glyphs;
+ int cglyphs;
+ int nglyphs;
+ int lut[FONS_HASH_LUT_SIZE];
+};
+
+struct FONSstate
+{
+ int font;
+ int align;
+ float size;
+ unsigned int color;
+ float blur;
+ float spacing;
+};
+
+struct FONSatlasNode {
+ short x, y, width;
+};
+
+struct FONSatlas
+{
+ int width, height;
+ struct FONSatlasNode* nodes;
+ int nnodes;
+ int cnodes;
+};
+
+struct FONScontext
+{
+ struct FONSparams params;
+ float itw,ith;
+ unsigned char* texData;
+ int dirtyRect[4];
+ struct FONSfont** fonts;
+ struct FONSatlas* atlas;
+ int cfonts;
+ int nfonts;
+ float verts[FONS_VERTEX_COUNT*2];
+ float tcoords[FONS_VERTEX_COUNT*2];
+ unsigned int colors[FONS_VERTEX_COUNT];
+ int nverts;
+ unsigned char *scratch;
+ int nscratch;
+ struct FONSstate states[FONS_MAX_STATES];
+ int nstates;
+ void (*handleError)(void* uptr, int error, int val);
+ void* errorUptr;
+};
+
+static void* fons__tmpalloc(size_t size, void* up)
+{
+ unsigned char* ptr;
+ struct FONScontext* stash = (struct FONScontext*)up;
+
+ // 16-byte align the returned pointer
+ size = (size + 0xf) & ~0xf;
+
+ if (stash->nscratch+(int)size > FONS_SCRATCH_BUF_SIZE) {
+ if (stash->handleError)
+ stash->handleError(stash->errorUptr, FONS_SCRATCH_FULL, stash->nscratch+(int)size);
+ return NULL;
+ }
+ ptr = stash->scratch + stash->nscratch;
+ stash->nscratch += (int)size;
+ return ptr;
+}
+
+static void fons__tmpfree(void* ptr, void* up)
+{
+ (void)ptr;
+ (void)up;
+ // empty
+}
+
+// Copyright (c) 2008-2010 Bjoern Hoehrmann <bjoern@hoehrmann.de>
+// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
+
+#define FONS_UTF8_ACCEPT 0
+#define FONS_UTF8_REJECT 12
+
+static unsigned int fons__decutf8(unsigned int* state, unsigned int* codep, unsigned int byte)
+{
+ static const unsigned char utf8d[] = {
+ // The first part of the table maps bytes to character classes that
+ // to reduce the size of the transition table and create bitmasks.
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+ 1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1, 9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+ 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7, 7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+ 8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2, 2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+ 10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8,
+
+ // The second part is a transition table that maps a combination
+ // of a state of the automaton and a character class to a state.
+ 0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
+ 12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
+ 12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
+ 12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
+ 12,36,12,12,12,12,12,12,12,12,12,12,
+ };
+
+ unsigned int type = utf8d[byte];
+
+ *codep = (*state != FONS_UTF8_ACCEPT) ?
+ (byte & 0x3fu) | (*codep << 6) :
+ (0xff >> type) & (byte);
+
+ *state = utf8d[256 + *state + type];
+ return *state;
+}
+
+// Atlas based on Skyline Bin Packer by Jukka Jylänki
+
+static void fons__deleteAtlas(struct FONSatlas* atlas)
+{
+ if (atlas == NULL) return;
+ if (atlas->nodes != NULL) free(atlas->nodes);
+ free(atlas);
+}
+
+static struct FONSatlas* fons__allocAtlas(int w, int h, int nnodes)
+{
+ struct FONSatlas* atlas = NULL;
+
+ // Allocate memory for the font stash.
+ atlas = (struct FONSatlas*)malloc(sizeof(struct FONSatlas));
+ if (atlas == NULL) goto error;
+ memset(atlas, 0, sizeof(struct FONSatlas));
+
+ atlas->width = w;
+ atlas->height = h;
+
+ // Allocate space for skyline nodes
+ atlas->nodes = (struct FONSatlasNode*)malloc(sizeof(struct FONSatlasNode) * nnodes);
+ if (atlas->nodes == NULL) goto error;
+ memset(atlas->nodes, 0, sizeof(struct FONSatlasNode) * nnodes);
+ atlas->nnodes = 0;
+ atlas->cnodes = nnodes;
+
+ // Init root node.
+ atlas->nodes[0].x = 0;
+ atlas->nodes[0].y = 0;
+ atlas->nodes[0].width = (short)w;
+ atlas->nnodes++;
+
+ return atlas;
+
+error:
+ if (atlas) fons__deleteAtlas(atlas);
+ return NULL;
+}
+
+static int fons__atlasInsertNode(struct FONSatlas* atlas, int idx, int x, int y, int w)
+{
+ int i;
+ // Insert node
+ if (atlas->nnodes+1 > atlas->cnodes) {
+ atlas->cnodes = atlas->cnodes == 0 ? 8 : atlas->cnodes * 2;
+ atlas->nodes = (struct FONSatlasNode*)realloc(atlas->nodes, sizeof(struct FONSatlasNode) * atlas->cnodes);
+ if (atlas->nodes == NULL)
+ return 0;
+ }
+ for (i = atlas->nnodes; i > idx; i--)
+ atlas->nodes[i] = atlas->nodes[i-1];
+ atlas->nodes[idx].x = (short)x;
+ atlas->nodes[idx].y = (short)y;
+ atlas->nodes[idx].width = (short)w;
+ atlas->nnodes++;
+
+ return 1;
+}
+
+static void fons__atlasRemoveNode(struct FONSatlas* atlas, int idx)
+{
+ int i;
+ if (atlas->nnodes == 0) return;
+ for (i = idx; i < atlas->nnodes-1; i++)
+ atlas->nodes[i] = atlas->nodes[i+1];
+ atlas->nnodes--;
+}
+
+static void fons__atlasExpand(struct FONSatlas* atlas, int w, int h)
+{
+ // Insert node for empty space
+ if (w > atlas->width)
+ fons__atlasInsertNode(atlas, atlas->nnodes, atlas->width, 0, w - atlas->width);
+ atlas->width = w;
+ atlas->height = h;
+}
+
+static void fons__atlasReset(struct FONSatlas* atlas, int w, int h)
+{
+ atlas->width = w;
+ atlas->height = h;
+ atlas->nnodes = 0;
+
+ // Init root node.
+ atlas->nodes[0].x = 0;
+ atlas->nodes[0].y = 0;
+ atlas->nodes[0].width = (short)w;
+ atlas->nnodes++;
+}
+
+static int fons__atlasAddSkylineLevel(struct FONSatlas* atlas, int idx, int x, int y, int w, int h)
+{
+ int i;
+
+ // Insert new node
+ if (fons__atlasInsertNode(atlas, idx, x, y+h, w) == 0)
+ return 0;
+
+ // Delete skyline segments that fall under the shaodw of the new segment.
+ for (i = idx+1; i < atlas->nnodes; i++) {
+ if (atlas->nodes[i].x < atlas->nodes[i-1].x + atlas->nodes[i-1].width) {
+ int shrink = atlas->nodes[i-1].x + atlas->nodes[i-1].width - atlas->nodes[i].x;
+ atlas->nodes[i].x += (short)shrink;
+ atlas->nodes[i].width -= (short)shrink;
+ if (atlas->nodes[i].width <= 0) {
+ fons__atlasRemoveNode(atlas, i);
+ i--;
+ } else {
+ break;
+ }
+ } else {
+ break;
+ }
+ }
+
+ // Merge same height skyline segments that are next to each other.
+ for (i = 0; i < atlas->nnodes-1; i++) {
+ if (atlas->nodes[i].y == atlas->nodes[i+1].y) {
+ atlas->nodes[i].width += atlas->nodes[i+1].width;
+ fons__atlasRemoveNode(atlas, i+1);
+ i--;
+ }
+ }
+
+ return 1;
+}
+
+static int fons__atlasRectFits(struct FONSatlas* atlas, int i, int w, int h)
+{
+ // Checks if there is enough space at the location of skyline span 'i',
+ // and return the max height of all skyline spans under that at that location,
+ // (think tetris block being dropped at that position). Or -1 if no space found.
+ int x = atlas->nodes[i].x;
+ int y = atlas->nodes[i].y;
+ int spaceLeft;
+ if (x + w > atlas->width)
+ return -1;
+ spaceLeft = w;
+ while (spaceLeft > 0) {
+ if (i == atlas->nnodes) return -1;
+ y = fons__maxi(y, atlas->nodes[i].y);
+ if (y + h > atlas->height) return -1;
+ spaceLeft -= atlas->nodes[i].width;
+ ++i;
+ }
+ return y;
+}
+
+static int fons__atlasAddRect(struct FONSatlas* atlas, int rw, int rh, int* rx, int* ry)
+{
+ int besth = atlas->height, bestw = atlas->width, besti = -1;
+ int bestx = -1, besty = -1, i;
+
+ // Bottom left fit heuristic.
+ for (i = 0; i < atlas->nnodes; i++) {
+ int y = fons__atlasRectFits(atlas, i, rw, rh);
+ if (y != -1) {
+ if (y + rh < besth || (y + rh == besth && atlas->nodes[i].width < bestw)) {
+ besti = i;
+ bestw = atlas->nodes[i].width;
+ besth = y + rh;
+ bestx = atlas->nodes[i].x;
+ besty = y;
+ }
+ }
+ }
+
+ if (besti == -1)
+ return 0;
+
+ // Perform the actual packing.
+ if (fons__atlasAddSkylineLevel(atlas, besti, bestx, besty, rw, rh) == 0)
+ return 0;
+
+ *rx = bestx;
+ *ry = besty;
+
+ return 1;
+}
+
+static void fons__addWhiteRect(struct FONScontext* stash, int w, int h)
+{
+ int x, y, gx, gy;
+ unsigned char* dst;
+ if (fons__atlasAddRect(stash->atlas, w, h, &gx, &gy) == 0)
+ return;
+
+ // Rasterize
+ dst = &stash->texData[gx + gy * stash->params.width];
+ for (y = 0; y < h; y++) {
+ for (x = 0; x < w; x++)
+ dst[x] = 0xff;
+ dst += stash->params.width;
+ }
+
+ stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], gx);
+ stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], gy);
+ stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], gx+w);
+ stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], gy+h);
+}
+
+struct FONScontext* fonsCreateInternal(struct FONSparams* params)
+{
+ struct FONScontext* stash = NULL;
+
+ // Allocate memory for the font stash.
+ stash = (struct FONScontext*)malloc(sizeof(struct FONScontext));
+ if (stash == NULL) goto error;
+ memset(stash, 0, sizeof(struct FONScontext));
+
+ stash->params = *params;
+
+ // Allocate scratch buffer.
+ stash->scratch = (unsigned char*)malloc(FONS_SCRATCH_BUF_SIZE);
+ if (stash->scratch == NULL) goto error;
+
+ // Initialize implementation library
+ if (!fons__tt_init(stash)) goto error;
+
+ if (stash->params.renderCreate != NULL) {
+ if (stash->params.renderCreate(stash->params.userPtr, stash->params.width, stash->params.height) == 0)
+ goto error;
+ }
+
+ stash->atlas = fons__allocAtlas(stash->params.width, stash->params.height, FONS_INIT_ATLAS_NODES);
+ if (stash->atlas == NULL) goto error;
+
+ // Allocate space for fonts.
+ stash->fonts = (struct FONSfont**)malloc(sizeof(struct FONSfont*) * FONS_INIT_FONTS);
+ if (stash->fonts == NULL) goto error;
+ memset(stash->fonts, 0, sizeof(struct FONSfont*) * FONS_INIT_FONTS);
+ stash->cfonts = FONS_INIT_FONTS;
+ stash->nfonts = 0;
+
+ // Create texture for the cache.
+ stash->itw = 1.0f/stash->params.width;
+ stash->ith = 1.0f/stash->params.height;
+ stash->texData = (unsigned char*)malloc(stash->params.width * stash->params.height);
+ if (stash->texData == NULL) goto error;
+ memset(stash->texData, 0, stash->params.width * stash->params.height);
+
+ stash->dirtyRect[0] = stash->params.width;
+ stash->dirtyRect[1] = stash->params.height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+
+ // Add white rect at 0,0 for debug drawing.
+ fons__addWhiteRect(stash, 2,2);
+
+ fonsPushState(stash);
+ fonsClearState(stash);
+
+ return stash;
+
+error:
+ fonsDeleteInternal(stash);
+ return NULL;
+}
+
+static struct FONSstate* fons__getState(struct FONScontext* stash)
+{
+ return &stash->states[stash->nstates-1];
+}
+
+void fonsSetSize(struct FONScontext* stash, float size)
+{
+ fons__getState(stash)->size = size;
+}
+
+void fonsSetColor(struct FONScontext* stash, unsigned int color)
+{
+ fons__getState(stash)->color = color;
+}
+
+void fonsSetSpacing(struct FONScontext* stash, float spacing)
+{
+ fons__getState(stash)->spacing = spacing;
+}
+
+void fonsSetBlur(struct FONScontext* stash, float blur)
+{
+ fons__getState(stash)->blur = blur;
+}
+
+void fonsSetAlign(struct FONScontext* stash, int align)
+{
+ fons__getState(stash)->align = align;
+}
+
+void fonsSetFont(struct FONScontext* stash, int font)
+{
+ fons__getState(stash)->font = font;
+}
+
+void fonsPushState(struct FONScontext* stash)
+{
+ if (stash->nstates >= FONS_MAX_STATES) {
+ if (stash->handleError)
+ stash->handleError(stash->errorUptr, FONS_STATES_OVERFLOW, 0);
+ return;
+ }
+ if (stash->nstates > 0)
+ memcpy(&stash->states[stash->nstates], &stash->states[stash->nstates-1], sizeof(struct FONSstate));
+ stash->nstates++;
+}
+
+void fonsPopState(struct FONScontext* stash)
+{
+ if (stash->nstates <= 1) {
+ if (stash->handleError)
+ stash->handleError(stash->errorUptr, FONS_STATES_UNDERFLOW, 0);
+ return;
+ }
+ stash->nstates--;
+}
+
+void fonsClearState(struct FONScontext* stash)
+{
+ struct FONSstate* state = fons__getState(stash);
+ state->size = 12.0f;
+ state->color = 0xffffffff;
+ state->font = 0;
+ state->blur = 0;
+ state->spacing = 0;
+ state->align = FONS_ALIGN_LEFT | FONS_ALIGN_BASELINE;
+}
+
+static void fons__freeFont(struct FONSfont* font)
+{
+ if (font == NULL) return;
+ if (font->glyphs) free(font->glyphs);
+ if (font->freeData && font->data) free(font->data);
+ free(font);
+}
+
+static int fons__allocFont(struct FONScontext* stash)
+{
+ struct FONSfont* font = NULL;
+ if (stash->nfonts+1 > stash->cfonts) {
+ stash->cfonts = stash->cfonts == 0 ? 8 : stash->cfonts * 2;
+ stash->fonts = (struct FONSfont**)realloc(stash->fonts, sizeof(struct FONSfont*) * stash->cfonts);
+ if (stash->fonts == NULL)
+ return -1;
+ }
+ font = (struct FONSfont*)malloc(sizeof(struct FONSfont));
+ if (font == NULL) goto error;
+ memset(font, 0, sizeof(struct FONSfont));
+
+ font->glyphs = (struct FONSglyph*)malloc(sizeof(struct FONSglyph) * FONS_INIT_GLYPHS);
+ if (font->glyphs == NULL) goto error;
+ font->cglyphs = FONS_INIT_GLYPHS;
+ font->nglyphs = 0;
+
+ stash->fonts[stash->nfonts++] = font;
+ return stash->nfonts-1;
+
+error:
+ fons__freeFont(font);
+
+ return FONS_INVALID;
+}
+
+int fonsAddFont(struct FONScontext* stash, const char* name, const char* path)
+{
+ FILE* fp = 0;
+ int dataSize = 0;
+ unsigned char* data = NULL;
+
+ // Read in the font data.
+ fp = fopen(path, "rb");
+ if (!fp) goto error;
+ fseek(fp,0,SEEK_END);
+ dataSize = (int)ftell(fp);
+ fseek(fp,0,SEEK_SET);
+ data = (unsigned char*)malloc(dataSize);
+ if (data == NULL) goto error;
+ fread(data, 1, dataSize, fp);
+ fclose(fp);
+ fp = 0;
+
+ return fonsAddFontMem(stash, name, data, dataSize, 1);
+
+error:
+ if (data) free(data);
+ if (fp) fclose(fp);
+ return FONS_INVALID;
+}
+
+int fonsAddFontMem(struct FONScontext* stash, const char* name, unsigned char* data, int dataSize, int freeData)
+{
+ int i, ascent, descent, fh, lineGap;
+ struct FONSfont* font;
+
+ int idx = fons__allocFont(stash);
+ if (idx == FONS_INVALID)
+ return FONS_INVALID;
+
+ font = stash->fonts[idx];
+
+ strncpy(font->name, name, sizeof(font->name));
+ font->name[sizeof(font->name)-1] = '\0';
+
+ // Init hash lookup.
+ for (i = 0; i < FONS_HASH_LUT_SIZE; ++i)
+ font->lut[i] = -1;
+
+ // Read in the font data.
+ font->dataSize = dataSize;
+ font->data = data;
+ font->freeData = (unsigned char)freeData;
+
+ // Init font
+ stash->nscratch = 0;
+ if (!fons__tt_loadFont(stash, &font->font, data, dataSize)) goto error;
+
+ // Store normalized line height. The real line height is got
+ // by multiplying the lineh by font size.
+ fons__tt_getFontVMetrics( &font->font, &ascent, &descent, &lineGap);
+ fh = ascent - descent;
+ font->ascender = (float)ascent / (float)fh;
+ font->descender = (float)descent / (float)fh;
+ font->lineh = (float)(fh + lineGap) / (float)fh;
+
+ return idx;
+
+error:
+ fons__freeFont(font);
+ stash->nfonts--;
+ return FONS_INVALID;
+}
+
+int fonsGetFontByName(struct FONScontext* s, const char* name)
+{
+ int i;
+ for (i = 0; i < s->nfonts; i++) {
+ if (strcmp(s->fonts[i]->name, name) == 0)
+ return i;
+ }
+ return FONS_INVALID;
+}
+
+
+static struct FONSglyph* fons__allocGlyph(struct FONSfont* font)
+{
+ if (font->nglyphs+1 > font->cglyphs) {
+ font->cglyphs = font->cglyphs == 0 ? 8 : font->cglyphs * 2;
+ font->glyphs = (struct FONSglyph*)realloc(font->glyphs, sizeof(struct FONSglyph) * font->cglyphs);
+ if (font->glyphs == NULL) return NULL;
+ }
+ font->nglyphs++;
+ return &font->glyphs[font->nglyphs-1];
+}
+
+
+// Based on Exponential blur, Jani Huhtanen, 2006
+
+#define APREC 16
+#define ZPREC 7
+
+static void fons__blurCols(unsigned char* dst, int w, int h, int dstStride, int alpha)
+{
+ int x, y;
+ for (y = 0; y < h; y++) {
+ int z = 0; // force zero border
+ for (x = 1; x < w; x++) {
+ z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
+ dst[x] = (unsigned char)(z >> ZPREC);
+ }
+ dst[w-1] = 0; // force zero border
+ z = 0;
+ for (x = w-2; x >= 0; x--) {
+ z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
+ dst[x] = (unsigned char)(z >> ZPREC);
+ }
+ dst[0] = 0; // force zero border
+ dst += dstStride;
+ }
+}
+
+static void fons__blurRows(unsigned char* dst, int w, int h, int dstStride, int alpha)
+{
+ int x, y;
+ for (x = 0; x < w; x++) {
+ int z = 0; // force zero border
+ for (y = dstStride; y < h*dstStride; y += dstStride) {
+ z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
+ dst[y] = (unsigned char)(z >> ZPREC);
+ }
+ dst[(h-1)*dstStride] = 0; // force zero border
+ z = 0;
+ for (y = (h-2)*dstStride; y >= 0; y -= dstStride) {
+ z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
+ dst[y] = (unsigned char)(z >> ZPREC);
+ }
+ dst[0] = 0; // force zero border
+ dst++;
+ }
+}
+
+
+static void fons__blur(struct FONScontext* stash, unsigned char* dst, int w, int h, int dstStride, int blur)
+{
+ int alpha;
+ float sigma;
+ (void)stash;
+
+ if (blur < 1)
+ return;
+ // Calculate the alpha such that 90% of the kernel is within the radius. (Kernel extends to infinity)
+ sigma = (float)blur * 0.57735f; // 1 / sqrt(3)
+ alpha = (int)((1<<APREC) * (1.0f - expf(-2.3f / (sigma+1.0f))));
+ fons__blurRows(dst, w, h, dstStride, alpha);
+ fons__blurCols(dst, w, h, dstStride, alpha);
+ fons__blurRows(dst, w, h, dstStride, alpha);
+ fons__blurCols(dst, w, h, dstStride, alpha);
+// fons__blurrows(dst, w, h, dstStride, alpha);
+// fons__blurcols(dst, w, h, dstStride, alpha);
+}
+
+static struct FONSglyph* fons__getGlyph(struct FONScontext* stash, struct FONSfont* font, unsigned int codepoint,
+ short isize, short iblur)
+{
+ int i, g, advance, lsb, x0, y0, x1, y1, gw, gh, gx, gy, x, y;
+ float scale;
+ struct FONSglyph* glyph = NULL;
+ unsigned int h;
+ float size = isize/10.0f;
+ int pad, added;
+ unsigned char* bdst;
+ unsigned char* dst;
+
+ if (isize < 2) return NULL;
+ if (iblur > 20) iblur = 20;
+ pad = iblur+2;
+
+ // Reset allocator.
+ stash->nscratch = 0;
+
+ // Find code point and size.
+ h = fons__hashint(codepoint) & (FONS_HASH_LUT_SIZE-1);
+ i = font->lut[h];
+ while (i != -1) {
+ if (font->glyphs[i].codepoint == codepoint && font->glyphs[i].size == isize && font->glyphs[i].blur == iblur)
+ return &font->glyphs[i];
+ i = font->glyphs[i].next;
+ }
+
+ // Could not find glyph, create it.
+ scale = fons__tt_getPixelHeightScale(&font->font, size);
+ g = fons__tt_getGlyphIndex(&font->font, codepoint);
+ fons__tt_buildGlyphBitmap(&font->font, g, size, scale, &advance, &lsb, &x0, &y0, &x1, &y1);
+ gw = x1-x0 + pad*2;
+ gh = y1-y0 + pad*2;
+
+ // Find free spot for the rect in the atlas
+ added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy);
+ if (added == 0 && stash->handleError != NULL) {
+ // Atlas is full, let the user to resize the atlas (or not), and try again.
+ stash->handleError(stash->errorUptr, FONS_ATLAS_FULL, 0);
+ added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy);
+ }
+ if (added == 0) return NULL;
+
+ // Init glyph.
+ glyph = fons__allocGlyph(font);
+ glyph->codepoint = codepoint;
+ glyph->size = isize;
+ glyph->blur = iblur;
+ glyph->index = g;
+ glyph->x0 = (short)gx;
+ glyph->y0 = (short)gy;
+ glyph->x1 = (short)(glyph->x0+gw);
+ glyph->y1 = (short)(glyph->y0+gh);
+ glyph->xadv = (short)(scale * advance * 10.0f);
+ glyph->xoff = (short)(x0 - pad);
+ glyph->yoff = (short)(y0 - pad);
+ glyph->next = 0;
+
+ // Insert char to hash lookup.
+ glyph->next = font->lut[h];
+ font->lut[h] = font->nglyphs-1;
+
+ // Rasterize
+ dst = &stash->texData[(glyph->x0+pad) + (glyph->y0+pad) * stash->params.width];
+ fons__tt_renderGlyphBitmap(&font->font, dst, gw-pad*2,gh-pad*2, stash->params.width, scale,scale, g);
+
+ // Make sure there is one pixel empty border.
+ dst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+ for (y = 0; y < gh; y++) {
+ dst[y*stash->params.width] = 0;
+ dst[gw-1 + y*stash->params.width] = 0;
+ }
+ for (x = 0; x < gw; x++) {
+ dst[x] = 0;
+ dst[x + (gh-1)*stash->params.width] = 0;
+ }
+
+ // Debug code to color the glyph background
+/* unsigned char* fdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+ for (y = 0; y < gh; y++) {
+ for (x = 0; x < gw; x++) {
+ int a = (int)fdst[x+y*stash->params.width] + 20;
+ if (a > 255) a = 255;
+ fdst[x+y*stash->params.width] = a;
+ }
+ }*/
+
+ // Blur
+ if (iblur > 0) {
+ stash->nscratch = 0;
+ bdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+ fons__blur(stash, bdst, gw,gh, stash->params.width, iblur);
+ }
+
+ stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], glyph->x0);
+ stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], glyph->y0);
+ stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], glyph->x1);
+ stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], glyph->y1);
+
+ return glyph;
+}
+
+static void fons__getQuad(struct FONScontext* stash, struct FONSfont* font,
+ struct FONSglyph* prevGlyph, struct FONSglyph* glyph,
+ float scale, float spacing, float* x, float* y, struct FONSquad* q)
+{
+ float rx,ry,xoff,yoff,x0,y0,x1,y1;
+
+ if (prevGlyph) {
+ float adv = fons__tt_getGlyphKernAdvance(&font->font, prevGlyph->index, glyph->index) * scale;
+ *x += (int)(adv + spacing + 0.5f);
+ }
+
+ // Each glyph has 2px border to allow good interpolation,
+ // one pixel to prevent leaking, and one to allow good interpolation for rendering.
+ // Inset the texture region by one pixel for corret interpolation.
+ xoff = (short)(glyph->xoff+1);
+ yoff = (short)(glyph->yoff+1);
+ x0 = (float)(glyph->x0+1);
+ y0 = (float)(glyph->y0+1);
+ x1 = (float)(glyph->x1-1);
+ y1 = (float)(glyph->y1-1);
+
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ rx = (float)(int)(*x + xoff);
+ ry = (float)(int)(*y + yoff);
+
+ q->x0 = rx;
+ q->y0 = ry;
+ q->x1 = rx + x1 - x0;
+ q->y1 = ry + y1 - y0;
+
+ q->s0 = x0 * stash->itw;
+ q->t0 = y0 * stash->ith;
+ q->s1 = x1 * stash->itw;
+ q->t1 = y1 * stash->ith;
+ } else {
+ rx = (float)(int)(*x + xoff);
+ ry = (float)(int)(*y - yoff);
+
+ q->x0 = rx;
+ q->y0 = ry;
+ q->x1 = rx + x1 - x0;
+ q->y1 = ry - y1 + y0;
+
+ q->s0 = x0 * stash->itw;
+ q->t0 = y0 * stash->ith;
+ q->s1 = x1 * stash->itw;
+ q->t1 = y1 * stash->ith;
+ }
+
+ *x += (int)(glyph->xadv / 10.0f + 0.5f);
+}
+
+static void fons__flush(struct FONScontext* stash)
+{
+ // Flush texture
+ if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) {
+ if (stash->params.renderUpdate != NULL)
+ stash->params.renderUpdate(stash->params.userPtr, stash->dirtyRect, stash->texData);
+ // Reset dirty rect
+ stash->dirtyRect[0] = stash->params.width;
+ stash->dirtyRect[1] = stash->params.height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+ }
+
+ // Flush triangles
+ if (stash->nverts > 0) {
+ if (stash->params.renderDraw != NULL)
+ stash->params.renderDraw(stash->params.userPtr, stash->verts, stash->tcoords, stash->colors, stash->nverts);
+ stash->nverts = 0;
+ }
+}
+
+static __inline void fons__vertex(struct FONScontext* stash, float x, float y, float s, float t, unsigned int c)
+{
+ stash->verts[stash->nverts*2+0] = x;
+ stash->verts[stash->nverts*2+1] = y;
+ stash->tcoords[stash->nverts*2+0] = s;
+ stash->tcoords[stash->nverts*2+1] = t;
+ stash->colors[stash->nverts] = c;
+ stash->nverts++;
+}
+
+static float fons__getVertAlign(struct FONScontext* stash, struct FONSfont* font, int align, short isize)
+{
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ if (align & FONS_ALIGN_TOP) {
+ return font->ascender * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_MIDDLE) {
+ return (font->ascender + font->descender) / 2.0f * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_BASELINE) {
+ return 0.0f;
+ } else if (align & FONS_ALIGN_BOTTOM) {
+ return font->descender * (float)isize/10.0f;
+ }
+ } else {
+ if (align & FONS_ALIGN_TOP) {
+ return -font->ascender * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_MIDDLE) {
+ return -(font->ascender + font->descender) / 2.0f * (float)isize/10.0f;
+ } else if (align & FONS_ALIGN_BASELINE) {
+ return 0.0f;
+ } else if (align & FONS_ALIGN_BOTTOM) {
+ return -font->descender * (float)isize/10.0f;
+ }
+ }
+ return 0.0;
+}
+
+float fonsDrawText(struct FONScontext* stash,
+ float x, float y,
+ const char* str, const char* end)
+{
+ struct FONSstate* state = fons__getState(stash);
+ unsigned int codepoint;
+ unsigned int utf8state = 0;
+ struct FONSglyph* glyph = NULL;
+ struct FONSglyph* prevGlyph = NULL;
+ struct FONSquad q;
+ short isize = (short)(state->size*10.0f);
+ short iblur = (short)state->blur;
+ float scale;
+ struct FONSfont* font;
+ float width;
+
+ if (stash == NULL) return x;
+ if (state->font < 0 || state->font >= stash->nfonts) return x;
+ font = stash->fonts[state->font];
+ if (!font->data) return x;
+
+ scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f);
+
+ if (end == NULL)
+ end = str + strlen(str);
+
+ // Align horizontally
+ if (state->align & FONS_ALIGN_LEFT) {
+ // empty
+ } else if (state->align & FONS_ALIGN_RIGHT) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width;
+ } else if (state->align & FONS_ALIGN_CENTER) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width * 0.5f;
+ }
+ // Align vertically.
+ y += fons__getVertAlign(stash, font, state->align, isize);
+
+ for (; str != end; ++str) {
+ if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
+ continue;
+ glyph = fons__getGlyph(stash, font, codepoint, isize, iblur);
+ if (glyph) {
+ fons__getQuad(stash, font, prevGlyph, glyph, scale, state->spacing, &x, &y, &q);
+
+ if (stash->nverts+6 > FONS_VERTEX_COUNT)
+ fons__flush(stash);
+
+ fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color);
+ fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color);
+ fons__vertex(stash, q.x1, q.y0, q.s1, q.t0, state->color);
+
+ fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color);
+ fons__vertex(stash, q.x0, q.y1, q.s0, q.t1, state->color);
+ fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color);
+ }
+ prevGlyph = glyph;
+ }
+ fons__flush(stash);
+
+ return x;
+}
+
+int fonsTextIterInit(struct FONScontext* stash, struct FONStextIter* iter,
+ float x, float y, const char* str, const char* end)
+{
+ struct FONSstate* state = fons__getState(stash);
+ float width;
+
+ memset(iter, 0, sizeof(*iter));
+
+ if (stash == NULL) return 0;
+ if (state->font < 0 || state->font >= stash->nfonts) return 0;
+ iter->font = stash->fonts[state->font];
+ if (!iter->font->data) return 0;
+
+ iter->isize = (short)(state->size*10.0f);
+ iter->iblur = (short)state->blur;
+ iter->scale = fons__tt_getPixelHeightScale(&iter->font->font, (float)iter->isize/10.0f);
+
+ // Align horizontally
+ if (state->align & FONS_ALIGN_LEFT) {
+ // empty
+ } else if (state->align & FONS_ALIGN_RIGHT) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width;
+ } else if (state->align & FONS_ALIGN_CENTER) {
+ width = fonsTextBounds(stash, x,y, str, end, NULL);
+ x -= width * 0.5f;
+ }
+ // Align vertically.
+ y += fons__getVertAlign(stash, iter->font, state->align, iter->isize);
+
+ if (end == NULL)
+ end = str + strlen(str);
+
+ iter->x = iter->nextx = x;
+ iter->y = iter->nexty = y;
+ iter->spacing = state->spacing;
+ iter->str = str;
+ iter->next = str;
+ iter->end = end;
+ iter->codepoint = 0;
+
+ return 1;
+}
+
+int fonsTextIterNext(struct FONScontext* stash, struct FONStextIter* iter, struct FONSquad* quad)
+{
+ struct FONSglyph* glyph = NULL;
+ const char* str = iter->next;
+ iter->str = iter->next;
+
+ if (str == iter->end)
+ return 0;
+
+ for (; str != iter->end; str++) {
+ if (fons__decutf8(&iter->utf8state, &iter->codepoint, *(const unsigned char*)str))
+ continue;
+ str++;
+ // Get glyph and quad
+ iter->x = iter->nextx;
+ iter->y = iter->nexty;
+ glyph = fons__getGlyph(stash, iter->font, iter->codepoint, iter->isize, iter->iblur);
+ if (glyph != NULL)
+ fons__getQuad(stash, iter->font, iter->prevGlyph, glyph, iter->scale, iter->spacing, &iter->nextx, &iter->nexty, quad);
+ iter->prevGlyph = glyph;
+ break;
+ }
+ iter->next = str;
+
+ return 1;
+}
+
+void fonsDrawDebug(struct FONScontext* stash, float x, float y)
+{
+ int i;
+ int w = stash->params.width;
+ int h = stash->params.height;
+ float u = w == 0 ? 0 : (1.0f / w);
+ float v = h == 0 ? 0 : (1.0f / h);
+
+ if (stash->nverts+6+6 > FONS_VERTEX_COUNT)
+ fons__flush(stash);
+
+ // Draw background
+ fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff);
+ fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff);
+ fons__vertex(stash, x+w, y+0, u, v, 0x0fffffff);
+
+ fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff);
+ fons__vertex(stash, x+0, y+h, u, v, 0x0fffffff);
+ fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff);
+
+ // Draw texture
+ fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff);
+ fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff);
+ fons__vertex(stash, x+w, y+0, 1, 0, 0xffffffff);
+
+ fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff);
+ fons__vertex(stash, x+0, y+h, 0, 1, 0xffffffff);
+ fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff);
+
+ // Drawbug draw atlas
+ for (i = 0; i < stash->atlas->nnodes; i++) {
+ struct FONSatlasNode* n = &stash->atlas->nodes[i];
+
+ if (stash->nverts+6 > FONS_VERTEX_COUNT)
+ fons__flush(stash);
+
+ fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+n->width, y+n->y+0, u, v, 0xc00000ff);
+
+ fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+0, y+n->y+1, u, v, 0xc00000ff);
+ fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff);
+ }
+
+ fons__flush(stash);
+}
+
+float fonsTextBounds(struct FONScontext* stash,
+ float x, float y,
+ const char* str, const char* end,
+ float* bounds)
+{
+ struct FONSstate* state = fons__getState(stash);
+ unsigned int codepoint;
+ unsigned int utf8state = 0;
+ struct FONSquad q;
+ struct FONSglyph* glyph = NULL;
+ struct FONSglyph* prevGlyph = NULL;
+ short isize = (short)(state->size*10.0f);
+ short iblur = (short)state->blur;
+ float scale;
+ struct FONSfont* font;
+ float startx, advance;
+ float minx, miny, maxx, maxy;
+
+ if (stash == NULL) return 0;
+ if (state->font < 0 || state->font >= stash->nfonts) return 0;
+ font = stash->fonts[state->font];
+ if (!font->data) return 0;
+
+ scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f);
+
+ // Align vertically.
+ y += fons__getVertAlign(stash, font, state->align, isize);
+
+ minx = maxx = x;
+ miny = maxy = y;
+ startx = x;
+
+ if (end == NULL)
+ end = str + strlen(str);
+
+ for (; str != end; ++str) {
+ if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
+ continue;
+ glyph = fons__getGlyph(stash, font, codepoint, isize, iblur);
+ if (glyph) {
+ fons__getQuad(stash, font, prevGlyph, glyph, scale, state->spacing, &x, &y, &q);
+ if (q.x0 < minx) minx = q.x0;
+ if (q.x1 > maxx) maxx = q.x1;
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ if (q.y0 < miny) miny = q.y0;
+ if (q.y1 > maxy) maxy = q.y1;
+ } else {
+ if (q.y1 < miny) miny = q.y1;
+ if (q.y0 > maxy) maxy = q.y0;
+ }
+ }
+ prevGlyph = glyph;
+ }
+
+ advance = x - startx;
+
+ // Align horizontally
+ if (state->align & FONS_ALIGN_LEFT) {
+ // empty
+ } else if (state->align & FONS_ALIGN_RIGHT) {
+ minx -= advance;
+ maxx -= advance;
+ } else if (state->align & FONS_ALIGN_CENTER) {
+ minx -= advance * 0.5f;
+ maxx -= advance * 0.5f;
+ }
+
+ if (bounds) {
+ bounds[0] = minx;
+ bounds[1] = miny;
+ bounds[2] = maxx;
+ bounds[3] = maxy;
+ }
+
+ return advance;
+}
+
+void fonsVertMetrics(struct FONScontext* stash,
+ float* ascender, float* descender, float* lineh)
+{
+ struct FONSfont* font;
+ struct FONSstate* state = fons__getState(stash);
+ short isize;
+
+ if (stash == NULL) return;
+ if (state->font < 0 || state->font >= stash->nfonts) return;
+ font = stash->fonts[state->font];
+ isize = (short)(state->size*10.0f);
+ if (!font->data) return;
+
+ if (ascender)
+ *ascender = font->ascender*isize/10.0f;
+ if (descender)
+ *descender = font->descender*isize/10.0f;
+ if (lineh)
+ *lineh = font->lineh*isize/10.0f;
+}
+
+void fonsLineBounds(struct FONScontext* stash, float y, float* miny, float* maxy)
+{
+ struct FONSfont* font;
+ struct FONSstate* state = fons__getState(stash);
+ short isize;
+
+ if (stash == NULL) return;
+ if (state->font < 0 || state->font >= stash->nfonts) return;
+ font = stash->fonts[state->font];
+ isize = (short)(state->size*10.0f);
+ if (!font->data) return;
+
+ y += fons__getVertAlign(stash, font, state->align, isize);
+
+ if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+ *miny = y - font->ascender * (float)isize/10.0f;
+ *maxy = *miny + font->lineh*isize/10.0f;
+ } else {
+ *maxy = y + font->descender * (float)isize/10.0f;
+ *miny = *maxy - font->lineh*isize/10.0f;
+ }
+}
+
+const unsigned char* fonsGetTextureData(struct FONScontext* stash, int* width, int* height)
+{
+ if (width != NULL)
+ *width = stash->params.width;
+ if (height != NULL)
+ *height = stash->params.height;
+ return stash->texData;
+}
+
+int fonsValidateTexture(struct FONScontext* stash, int* dirty)
+{
+ if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) {
+ dirty[0] = stash->dirtyRect[0];
+ dirty[1] = stash->dirtyRect[1];
+ dirty[2] = stash->dirtyRect[2];
+ dirty[3] = stash->dirtyRect[3];
+ // Reset dirty rect
+ stash->dirtyRect[0] = stash->params.width;
+ stash->dirtyRect[1] = stash->params.height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+ return 1;
+ }
+ return 0;
+}
+
+void fonsDeleteInternal(struct FONScontext* stash)
+{
+ int i;
+ if (stash == NULL) return;
+
+ if (stash->params.renderDelete)
+ stash->params.renderDelete(stash->params.userPtr);
+
+ for (i = 0; i < stash->nfonts; ++i)
+ fons__freeFont(stash->fonts[i]);
+
+ if (stash->atlas) fons__deleteAtlas(stash->atlas);
+ if (stash->fonts) free(stash->fonts);
+ if (stash->texData) free(stash->texData);
+ if (stash->scratch) free(stash->scratch);
+ free(stash);
+}
+
+void fonsSetErrorCallback(struct FONScontext* stash, void (*callback)(void* uptr, int error, int val), void* uptr)
+{
+ if (stash == NULL) return;
+ stash->handleError = callback;
+ stash->errorUptr = uptr;
+}
+
+void fonsGetAtlasSize(struct FONScontext* stash, int* width, int* height)
+{
+ if (stash == NULL) return;
+ *width = stash->params.width;
+ *height = stash->params.height;
+}
+
+int fonsExpandAtlas(struct FONScontext* stash, int width, int height)
+{
+ int i, maxy = 0;
+ unsigned char* data = NULL;
+ if (stash == NULL) return 0;
+
+ width = fons__maxi(width, stash->params.width);
+ height = fons__maxi(height, stash->params.height);
+
+ if (width == stash->params.width && height == stash->params.height)
+ return 1;
+
+ // Flush pending glyphs.
+ fons__flush(stash);
+
+ // Create new texture
+ if (stash->params.renderResize != NULL) {
+ if (stash->params.renderResize(stash->params.userPtr, width, height) == 0)
+ return 0;
+ }
+ // Copy old texture data over.
+ data = (unsigned char*)malloc(width * height);
+ if (data == NULL)
+ return 0;
+ for (i = 0; i < stash->params.height; i++) {
+ unsigned char* dst = &data[i*width];
+ unsigned char* src = &stash->texData[i*stash->params.width];
+ memcpy(dst, src, stash->params.width);
+ if (width > stash->params.width)
+ memset(dst+stash->params.width, 0, width - stash->params.width);
+ }
+ if (height > stash->params.height)
+ memset(&data[stash->params.height * width], 0, (height - stash->params.height) * width);
+
+ free(stash->texData);
+ stash->texData = data;
+
+ // Increase atlas size
+ fons__atlasExpand(stash->atlas, width, height);
+
+ // Add axisting data as dirty.
+ for (i = 0; i < stash->atlas->nnodes; i++)
+ maxy = fons__maxi(maxy, stash->atlas->nodes[i].y);
+ stash->dirtyRect[0] = 0;
+ stash->dirtyRect[1] = 0;
+ stash->dirtyRect[2] = stash->params.width;
+ stash->dirtyRect[3] = maxy;
+
+ stash->params.width = width;
+ stash->params.height = height;
+ stash->itw = 1.0f/stash->params.width;
+ stash->ith = 1.0f/stash->params.height;
+
+ return 1;
+}
+
+int fonsResetAtlas(struct FONScontext* stash, int width, int height)
+{
+ int i, j;
+ if (stash == NULL) return 0;
+
+ // Flush pending glyphs.
+ fons__flush(stash);
+
+ // Create new texture
+ if (stash->params.renderResize != NULL) {
+ if (stash->params.renderResize(stash->params.userPtr, width, height) == 0)
+ return 0;
+ }
+
+ // Reset atlas
+ fons__atlasReset(stash->atlas, width, height);
+
+ // Clear texture data.
+ stash->texData = (unsigned char*)realloc(stash->texData, width * height);
+ if (stash->texData == NULL) return 0;
+ memset(stash->texData, 0, width * height);
+
+ // Reset dirty rect
+ stash->dirtyRect[0] = width;
+ stash->dirtyRect[1] = height;
+ stash->dirtyRect[2] = 0;
+ stash->dirtyRect[3] = 0;
+
+ // Reset cached glyphs
+ for (i = 0; i < stash->nfonts; i++) {
+ struct FONSfont* font = stash->fonts[i];
+ font->nglyphs = 0;
+ for (j = 0; j < FONS_HASH_LUT_SIZE; j++)
+ font->lut[j] = -1;
+ }
+
+ stash->params.width = width;
+ stash->params.height = height;
+ stash->itw = 1.0f/stash->params.width;
+ stash->ith = 1.0f/stash->params.height;
+
+ // Add white rect at 0,0 for debug drawing.
+ fons__addWhiteRect(stash, 2,2);
+
+ return 1;
+}
+
+
+#endif
diff --git a/dgl/src/nanovg/nanovg.c b/dgl/src/nanovg/nanovg.c
@@ -0,0 +1,2475 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include <stdio.h>
+#include <math.h>
+#include "nanovg.h"
+#define FONTSTASH_IMPLEMENTATION
+#include "fontstash.h"
+#include "stb_image.c"
+
+
+#define NVG_INIT_COMMANDS_SIZE 256
+#define NVG_INIT_POINTS_SIZE 128
+#define NVG_INIT_PATHS_SIZE 16
+#define NVG_INIT_VERTS_SIZE 256
+#define NVG_MAX_STATES 32
+
+#define NVG_KAPPA90 0.5522847493f // Lenght proportional to radius of a cubic bezier handle for 90deg arcs.
+
+#define NVG_COUNTOF(arr) (sizeof(arr) / sizeof(0[arr]))
+
+
+enum NVGcommands {
+ NVG_MOVETO = 0,
+ NVG_LINETO = 1,
+ NVG_BEZIERTO = 2,
+ NVG_CLOSE = 3,
+ NVG_WINDING = 4,
+};
+
+enum NVGpointFlags
+{
+ NVG_PT_CORNER = 0x01,
+ NVG_PT_LEFT = 0x02,
+ NVG_PT_BEVEL = 0x04,
+ NVG_PR_INNERBEVEL = 0x08,
+};
+
+enum NVGexpandFeatures {
+ NVG_FILL = 0x01,
+ NVG_STROKE = 0x02,
+ NVG_CAPS = 0x04,
+};
+
+struct NVGstate {
+ struct NVGpaint fill;
+ struct NVGpaint stroke;
+ float strokeWidth;
+ float miterLimit;
+ int lineJoin;
+ int lineCap;
+ float xform[6];
+ struct NVGscissor scissor;
+ float fontSize;
+ float letterSpacing;
+ float lineHeight;
+ float fontBlur;
+ int textAlign;
+ int fontId;
+};
+
+struct NVGpoint {
+ float x,y;
+ float dx, dy;
+ float len;
+ float dmx, dmy;
+ unsigned char flags;
+};
+
+struct NVGpathCache {
+ struct NVGpoint* points;
+ int npoints;
+ int cpoints;
+ struct NVGpath* paths;
+ int npaths;
+ int cpaths;
+ struct NVGvertex* verts;
+ int nverts;
+ int cverts;
+ float bounds[4];
+};
+
+struct NVGcontext {
+ struct NVGparams params;
+ float* commands;
+ int ccommands;
+ int ncommands;
+ float commandx, commandy;
+ struct NVGstate states[NVG_MAX_STATES];
+ int nstates;
+ struct NVGpathCache* cache;
+ float tessTol;
+ float distTol;
+ float fringeWidth;
+ float devicePxRatio;
+ struct FONScontext* fs;
+ int fontImage;
+ int alphaBlend;
+ int drawCallCount;
+ int fillTriCount;
+ int strokeTriCount;
+ int textTriCount;
+};
+
+static float nvg__sqrtf(float a) { return sqrtf(a); }
+static float nvg__modf(float a, float b) { return fmodf(a, b); }
+static float nvg__sinf(float a) { return sinf(a); }
+static float nvg__cosf(float a) { return cosf(a); }
+static float nvg__tanf(float a) { return tanf(a); }
+static float nvg__atan2f(float a,float b) { return atan2f(a, b); }
+static float nvg__acosf(float a) { return acosf(a); }
+
+static int nvg__mini(int a, int b) { return a < b ? a : b; }
+static int nvg__maxi(int a, int b) { return a > b ? a : b; }
+static int nvg__clampi(int a, int mn, int mx) { return a < mn ? mn : (a > mx ? mx : a); }
+static float nvg__minf(float a, float b) { return a < b ? a : b; }
+static float nvg__maxf(float a, float b) { return a > b ? a : b; }
+static float nvg__absf(float a) { return a >= 0.0f ? a : -a; }
+static float nvg__clampf(float a, float mn, float mx) { return a < mn ? mn : (a > mx ? mx : a); }
+static float nvg__cross(float dx0, float dy0, float dx1, float dy1) { return dx1*dy0 - dx0*dy1; }
+
+static float nvg__normalize(float *x, float* y)
+{
+ float d = nvg__sqrtf((*x)*(*x) + (*y)*(*y));
+ if (d > 1e-6f) {
+ float id = 1.0f / d;
+ *x *= id;
+ *y *= id;
+ }
+ return d;
+}
+
+
+static void nvg__deletePathCache(struct NVGpathCache* c)
+{
+ if (c == NULL) return;
+ if (c->points != NULL) free(c->points);
+ if (c->paths != NULL) free(c->paths);
+ if (c->verts != NULL) free(c->verts);
+ free(c);
+}
+
+static struct NVGpathCache* nvg__allocPathCache()
+{
+ struct NVGpathCache* c = (struct NVGpathCache*)malloc(sizeof(struct NVGpathCache));
+ if (c == NULL) goto error;
+ memset(c, 0, sizeof(struct NVGpathCache));
+
+ c->points = (struct NVGpoint*)malloc(sizeof(struct NVGpoint)*NVG_INIT_POINTS_SIZE);
+ if (!c->points) goto error;
+ c->npoints = 0;
+ c->cpoints = NVG_INIT_POINTS_SIZE;
+
+ c->paths = (struct NVGpath*)malloc(sizeof(struct NVGpath)*NVG_INIT_PATHS_SIZE);
+ if (!c->paths) goto error;
+ c->npaths = 0;
+ c->cpaths = NVG_INIT_PATHS_SIZE;
+
+ c->verts = (struct NVGvertex*)malloc(sizeof(struct NVGvertex)*NVG_INIT_VERTS_SIZE);
+ if (!c->verts) goto error;
+ c->nverts = 0;
+ c->cverts = NVG_INIT_VERTS_SIZE;
+
+ return c;
+error:
+ nvg__deletePathCache(c);
+ return NULL;
+}
+
+static void nvg__setDevicePixelRatio(struct NVGcontext* ctx, float ratio)
+{
+ ctx->tessTol = 1.0f / ratio;
+ ctx->distTol = 0.01f / ratio;
+ ctx->fringeWidth = 1.0f / ratio;
+ ctx->devicePxRatio = ratio;
+}
+
+struct NVGcontext* nvgCreateInternal(struct NVGparams* params)
+{
+ struct FONSparams fontParams;
+ struct NVGcontext* ctx = (struct NVGcontext*)malloc(sizeof(struct NVGcontext));
+ if (ctx == NULL) goto error;
+ memset(ctx, 0, sizeof(struct NVGcontext));
+
+ ctx->params = *params;
+
+ ctx->commands = (float*)malloc(sizeof(float)*NVG_INIT_COMMANDS_SIZE);
+ if (!ctx->commands) goto error;
+ ctx->ncommands = 0;
+ ctx->ccommands = NVG_INIT_COMMANDS_SIZE;
+
+ ctx->alphaBlend = NVG_STRAIGHT_ALPHA;
+
+ ctx->cache = nvg__allocPathCache();
+ if (ctx->cache == NULL) goto error;
+
+ nvgSave(ctx);
+ nvgReset(ctx);
+
+ nvg__setDevicePixelRatio(ctx, 1.0f);
+
+ if (ctx->params.renderCreate(ctx->params.userPtr) == 0) goto error;
+
+ // Init font rendering
+ memset(&fontParams, 0, sizeof(fontParams));
+ fontParams.width = params->atlasWidth;
+ fontParams.height = params->atlasHeight;
+ fontParams.flags = FONS_ZERO_TOPLEFT;
+ fontParams.renderCreate = NULL;
+ fontParams.renderUpdate = NULL;
+ fontParams.renderDraw = NULL;
+ fontParams.renderDelete = NULL;
+ fontParams.userPtr = NULL;
+ ctx->fs = fonsCreateInternal(&fontParams);
+ if (ctx->fs == NULL) goto error;
+
+ // Create font texture
+ ctx->fontImage = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, fontParams.width, fontParams.height, NULL);
+ if (ctx->fontImage == 0) goto error;
+
+ return ctx;
+
+error:
+ nvgDeleteInternal(ctx);
+ return 0;
+}
+
+void nvgDeleteInternal(struct NVGcontext* ctx)
+{
+ if (ctx == NULL) return;
+ if (ctx->commands != NULL) free(ctx->commands);
+ if (ctx->cache != NULL) nvg__deletePathCache(ctx->cache);
+
+ if (ctx->fs)
+ fonsDeleteInternal(ctx->fs);
+
+ if (ctx->params.renderDelete != NULL)
+ ctx->params.renderDelete(ctx->params.userPtr);
+
+ free(ctx);
+}
+
+void nvgBeginFrame(struct NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio, int alphaBlend)
+{
+/* printf("Tris: draws:%d fill:%d stroke:%d text:%d TOT:%d\n",
+ ctx->drawCallCount, ctx->fillTriCount, ctx->strokeTriCount, ctx->textTriCount,
+ ctx->fillTriCount+ctx->strokeTriCount+ctx->textTriCount);*/
+
+ ctx->nstates = 0;
+ nvgSave(ctx);
+ nvgReset(ctx);
+
+ nvg__setDevicePixelRatio(ctx, devicePixelRatio);
+ ctx->alphaBlend = alphaBlend;
+
+ ctx->params.renderViewport(ctx->params.userPtr, windowWidth, windowHeight, ctx->alphaBlend);
+
+ ctx->drawCallCount = 0;
+ ctx->fillTriCount = 0;
+ ctx->strokeTriCount = 0;
+ ctx->textTriCount = 0;
+}
+
+void nvgEndFrame(struct NVGcontext* ctx)
+{
+ ctx->params.renderFlush(ctx->params.userPtr, ctx->alphaBlend);
+}
+
+struct NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b)
+{
+ return nvgRGBA(r,g,b,255);
+}
+
+struct NVGcolor nvgRGBf(float r, float g, float b)
+{
+ return nvgRGBAf(r,g,b,1.0f);
+}
+
+struct NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+ struct NVGcolor color;
+ // Use longer initialization to suppress warning.
+ color.r = r / 255.0f;
+ color.g = g / 255.0f;
+ color.b = b / 255.0f;
+ color.a = a / 255.0f;
+ return color;
+}
+
+struct NVGcolor nvgRGBAf(float r, float g, float b, float a)
+{
+ struct NVGcolor color;
+ // Use longer initialization to suppress warning.
+ color.r = r;
+ color.g = g;
+ color.b = b;
+ color.a = a;
+ return color;
+}
+
+struct NVGcolor nvgTransRGBA(struct NVGcolor c, unsigned char a)
+{
+ c.a = a / 255.0f;
+ return c;
+}
+
+struct NVGcolor nvgTransRGBAf(struct NVGcolor c, float a)
+{
+ c.a = a;
+ return c;
+}
+
+struct NVGcolor nvgLerpRGBA(struct NVGcolor c0, struct NVGcolor c1, float u)
+{
+ int i;
+ float oneminu;
+ struct NVGcolor cint;
+
+ u = nvg__clampf(u, 0.0f, 1.0f);
+ oneminu = 1.0f - u;
+ for( i = 0; i <4; ++i )
+ {
+ cint.rgba[i] = c0.rgba[i] * oneminu + c1.rgba[i] * u;
+ }
+
+ return cint;
+}
+
+struct NVGcolor nvgHSL(float h, float s, float l)
+{
+ return nvgHSLA(h,s,l,255);
+}
+
+static float nvg__hue(float h, float m1, float m2)
+{
+ if (h < 0) h += 1;
+ if (h > 1) h -= 1;
+ if (h < 1.0f/6.0f)
+ return m1 + (m2 - m1) * h * 6.0f;
+ else if (h < 3.0f/6.0f)
+ return m2;
+ else if (h < 4.0f/6.0f)
+ return m1 + (m2 - m1) * (2.0f/3.0f - h) * 6.0f;
+ return m1;
+}
+
+struct NVGcolor nvgHSLA(float h, float s, float l, unsigned char a)
+{
+ float m1, m2;
+ struct NVGcolor col;
+ h = nvg__modf(h, 1.0f);
+ if (h < 0.0f) h += 1.0f;
+ s = nvg__clampf(s, 0.0f, 1.0f);
+ l = nvg__clampf(l, 0.0f, 1.0f);
+ m2 = l <= 0.5f ? (l * (1 + s)) : (l + s - l * s);
+ m1 = 2 * l - m2;
+ col.r = nvg__clampf(nvg__hue(h + 1.0f/3.0f, m1, m2), 0.0f, 1.0f);
+ col.g = nvg__clampf(nvg__hue(h, m1, m2), 0.0f, 1.0f);
+ col.b = nvg__clampf(nvg__hue(h - 1.0f/3.0f, m1, m2), 0.0f, 1.0f);
+ col.a = a/255.0f;
+ return col;
+}
+
+
+static struct NVGstate* nvg__getState(struct NVGcontext* ctx)
+{
+ return &ctx->states[ctx->nstates-1];
+}
+
+void nvgTransformIdentity(float* t)
+{
+ t[0] = 1.0f; t[1] = 0.0f;
+ t[2] = 0.0f; t[3] = 1.0f;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformTranslate(float* t, float tx, float ty)
+{
+ t[0] = 1.0f; t[1] = 0.0f;
+ t[2] = 0.0f; t[3] = 1.0f;
+ t[4] = tx; t[5] = ty;
+}
+
+void nvgTransformScale(float* t, float sx, float sy)
+{
+ t[0] = sx; t[1] = 0.0f;
+ t[2] = 0.0f; t[3] = sy;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformRotate(float* t, float a)
+{
+ float cs = nvg__cosf(a), sn = nvg__sinf(a);
+ t[0] = cs; t[1] = sn;
+ t[2] = -sn; t[3] = cs;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformSkewX(float* t, float a)
+{
+ t[0] = 1.0f; t[1] = 0.0f;
+ t[2] = nvg__tanf(a); t[3] = 1.0f;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformSkewY(float* t, float a)
+{
+ t[0] = 1.0f; t[1] = nvg__tanf(a);
+ t[2] = 0.0f; t[3] = 1.0f;
+ t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformMultiply(float* t, const float* s)
+{
+ float t0 = t[0] * s[0] + t[1] * s[2];
+ float t2 = t[2] * s[0] + t[3] * s[2];
+ float t4 = t[4] * s[0] + t[5] * s[2] + s[4];
+ t[1] = t[0] * s[1] + t[1] * s[3];
+ t[3] = t[2] * s[1] + t[3] * s[3];
+ t[5] = t[4] * s[1] + t[5] * s[3] + s[5];
+ t[0] = t0;
+ t[2] = t2;
+ t[4] = t4;
+}
+
+void nvgTransformPremultiply(float* t, const float* s)
+{
+ float s2[6];
+ memcpy(s2, s, sizeof(float)*6);
+ nvgTransformMultiply(s2, t);
+ memcpy(t, s2, sizeof(float)*6);
+}
+
+int nvgTransformInverse(float* inv, const float* t)
+{
+ double invdet, det = (double)t[0] * t[3] - (double)t[2] * t[1];
+ if (det > -1e-6 && det < 1e-6) {
+ nvgTransformIdentity(inv);
+ return 0;
+ }
+ invdet = 1.0 / det;
+ inv[0] = (float)(t[3] * invdet);
+ inv[2] = (float)(-t[2] * invdet);
+ inv[4] = (float)(((double)t[2] * t[5] - (double)t[3] * t[4]) * invdet);
+ inv[1] = (float)(-t[1] * invdet);
+ inv[3] = (float)(t[0] * invdet);
+ inv[5] = (float)(((double)t[1] * t[4] - (double)t[0] * t[5]) * invdet);
+ return 1;
+}
+
+void nvgTransformPoint(float* dx, float* dy, const float* t, float sx, float sy)
+{
+ *dx = sx*t[0] + sy*t[2] + t[4];
+ *dy = sx*t[1] + sy*t[3] + t[5];
+}
+
+float nvgDegToRad(float deg)
+{
+ return deg / 180.0f * NVG_PI;
+}
+
+float nvgRadToDeg(float rad)
+{
+ return rad / NVG_PI * 180.0f;
+}
+
+static void nvg__setPaintColor(struct NVGpaint* p, struct NVGcolor color)
+{
+ memset(p, 0, sizeof(*p));
+ nvgTransformIdentity(p->xform);
+ p->radius = 0.0f;
+ p->feather = 1.0f;
+ p->innerColor = color;
+ p->outerColor = color;
+}
+
+
+// State handling
+void nvgSave(struct NVGcontext* ctx)
+{
+ if (ctx->nstates >= NVG_MAX_STATES)
+ return;
+ if (ctx->nstates > 0)
+ memcpy(&ctx->states[ctx->nstates], &ctx->states[ctx->nstates-1], sizeof(struct NVGstate));
+ ctx->nstates++;
+}
+
+void nvgRestore(struct NVGcontext* ctx)
+{
+ if (ctx->nstates <= 1)
+ return;
+ ctx->nstates--;
+}
+
+void nvgReset(struct NVGcontext* ctx)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ memset(state, 0, sizeof(*state));
+
+ nvg__setPaintColor(&state->fill, nvgRGBA(255,255,255,255));
+ nvg__setPaintColor(&state->stroke, nvgRGBA(0,0,0,255));
+ state->strokeWidth = 1.0f;
+ state->miterLimit = 10.0f;
+ state->lineCap = NVG_BUTT;
+ state->lineJoin = NVG_MITER;
+ nvgTransformIdentity(state->xform);
+
+ state->scissor.extent[0] = 0.0f;
+ state->scissor.extent[1] = 0.0f;
+
+ state->fontSize = 16.0f;
+ state->letterSpacing = 0.0f;
+ state->lineHeight = 0.0f;
+ state->fontBlur = 0.0f;
+ state->textAlign = NVG_ALIGN_LEFT | NVG_ALIGN_BASELINE;
+ state->fontId = 0;
+}
+
+// State setting
+void nvgStrokeWidth(struct NVGcontext* ctx, float width)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->strokeWidth = width;
+}
+
+void nvgMiterLimit(struct NVGcontext* ctx, float limit)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->miterLimit = limit;
+}
+
+void nvgLineCap(struct NVGcontext* ctx, int cap)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->lineCap = cap;
+}
+
+void nvgLineJoin(struct NVGcontext* ctx, int join)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->lineJoin = join;
+}
+
+
+void nvgTransform(struct NVGcontext* ctx, float a, float b, float c, float d, float e, float f)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float t[6] = { a, b, c, d, e, f };
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgResetTransform(struct NVGcontext* ctx)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ nvgTransformIdentity(state->xform);
+}
+
+void nvgTranslate(struct NVGcontext* ctx, float x, float y)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformTranslate(t, x,y);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgRotate(struct NVGcontext* ctx, float angle)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformRotate(t, angle);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgSkewX(struct NVGcontext* ctx, float angle)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformSkewX(t, angle);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgSkewY(struct NVGcontext* ctx, float angle)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformSkewY(t, angle);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgScale(struct NVGcontext* ctx, float x, float y)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float t[6];
+ nvgTransformScale(t, x,y);
+ nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgCurrentTransform(struct NVGcontext* ctx, float* xform)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ if (xform == NULL) return;
+ memcpy(xform, state->xform, sizeof(float)*6);
+}
+
+void nvgStrokeColor(struct NVGcontext* ctx, struct NVGcolor color)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ nvg__setPaintColor(&state->stroke, color);
+}
+
+void nvgStrokePaint(struct NVGcontext* ctx, struct NVGpaint paint)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->stroke = paint;
+ nvgTransformMultiply(state->stroke.xform, state->xform);
+}
+
+void nvgFillColor(struct NVGcontext* ctx, struct NVGcolor color)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ nvg__setPaintColor(&state->fill, color);
+}
+
+void nvgFillPaint(struct NVGcontext* ctx, struct NVGpaint paint)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->fill = paint;
+ nvgTransformMultiply(state->fill.xform, state->xform);
+}
+
+int nvgCreateImage(struct NVGcontext* ctx, const char* filename)
+{
+ int w, h, n, image;
+ unsigned char* img = stbi_load(filename, &w, &h, &n, 4);
+ if (img == NULL) {
+// printf("Failed to load %s - %s\n", filename, stbi_failure_reason());
+ return 0;
+ }
+ image = nvgCreateImageRGBA(ctx, w, h, img);
+ stbi_image_free(img);
+ return image;
+}
+
+int nvgCreateImageMem(struct NVGcontext* ctx, unsigned char* data, int ndata)
+{
+ int w, h, n, image;
+ unsigned char* img = stbi_load_from_memory(data, ndata, &w, &h, &n, 4);
+ if (img == NULL) {
+// printf("Failed to load %s - %s\n", filename, stbi_failure_reason());
+ return 0;
+ }
+ image = nvgCreateImageRGBA(ctx, w, h, img);
+ stbi_image_free(img);
+ return image;
+}
+
+int nvgCreateImageRGBA(struct NVGcontext* ctx, int w, int h, const unsigned char* data)
+{
+ return ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_RGBA, w, h, data);
+}
+
+void nvgUpdateImage(struct NVGcontext* ctx, int image, const unsigned char* data)
+{
+ int w, h;
+ ctx->params.renderGetTextureSize(ctx->params.userPtr, image, &w, &h);
+ ctx->params.renderUpdateTexture(ctx->params.userPtr, image, 0,0, w,h, data);
+}
+
+void nvgImageSize(struct NVGcontext* ctx, int image, int* w, int* h)
+{
+ ctx->params.renderGetTextureSize(ctx->params.userPtr, image, w, h);
+}
+
+void nvgDeleteImage(struct NVGcontext* ctx, int image)
+{
+ ctx->params.renderDeleteTexture(ctx->params.userPtr, image);
+}
+
+struct NVGpaint nvgLinearGradient(struct NVGcontext* ctx,
+ float sx, float sy, float ex, float ey,
+ struct NVGcolor icol, struct NVGcolor ocol)
+{
+ struct NVGpaint p;
+ float dx, dy, d;
+ const float large = 1e5;
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ // Calculate transform aligned to the line
+ dx = ex - sx;
+ dy = ey - sy;
+ d = sqrtf(dx*dx + dy*dy);
+ if (d > 0.0001f) {
+ dx /= d;
+ dy /= d;
+ } else {
+ dx = 0;
+ dy = 1;
+ }
+
+ p.xform[0] = dy; p.xform[1] = -dx;
+ p.xform[2] = dx; p.xform[3] = dy;
+ p.xform[4] = sx - dx*large; p.xform[5] = sy - dy*large;
+
+ p.extent[0] = large;
+ p.extent[1] = large + d*0.5f;
+
+ p.radius = 0.0f;
+
+ p.feather = nvg__maxf(1.0f, d);
+
+ p.innerColor = icol;
+ p.outerColor = ocol;
+
+ return p;
+}
+
+struct NVGpaint nvgRadialGradient(struct NVGcontext* ctx,
+ float cx, float cy, float inr, float outr,
+ struct NVGcolor icol, struct NVGcolor ocol)
+{
+ struct NVGpaint p;
+ float r = (inr+outr)*0.5f;
+ float f = (outr-inr);
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ nvgTransformIdentity(p.xform);
+ p.xform[4] = cx;
+ p.xform[5] = cy;
+
+ p.extent[0] = r;
+ p.extent[1] = r;
+
+ p.radius = r;
+
+ p.feather = nvg__maxf(1.0f, f);
+
+ p.innerColor = icol;
+ p.outerColor = ocol;
+
+ return p;
+}
+
+struct NVGpaint nvgBoxGradient(struct NVGcontext* ctx,
+ float x, float y, float w, float h, float r, float f,
+ struct NVGcolor icol, struct NVGcolor ocol)
+{
+ struct NVGpaint p;
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ nvgTransformIdentity(p.xform);
+ p.xform[4] = x+w*0.5f;
+ p.xform[5] = y+h*0.5f;
+
+ p.extent[0] = w*0.5f;
+ p.extent[1] = h*0.5f;
+
+ p.radius = r;
+
+ p.feather = nvg__maxf(1.0f, f);
+
+ p.innerColor = icol;
+ p.outerColor = ocol;
+
+ return p;
+}
+
+
+struct NVGpaint nvgImagePattern(struct NVGcontext* ctx,
+ float cx, float cy, float w, float h, float angle,
+ int image, int repeat)
+{
+ struct NVGpaint p;
+ NVG_NOTUSED(ctx);
+ memset(&p, 0, sizeof(p));
+
+ nvgTransformRotate(p.xform, angle);
+ p.xform[4] = cx;
+ p.xform[5] = cy;
+
+ p.extent[0] = w;
+ p.extent[1] = h;
+
+ p.image = image;
+ p.repeat = repeat;
+
+ return p;
+}
+
+// Scissoring
+void nvgScissor(struct NVGcontext* ctx, float x, float y, float w, float h)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+
+ nvgTransformIdentity(state->scissor.xform);
+ state->scissor.xform[4] = x+w*0.5f;
+ state->scissor.xform[5] = y+h*0.5f;
+ nvgTransformMultiply(state->scissor.xform, state->xform);
+
+ state->scissor.extent[0] = w*0.5f;
+ state->scissor.extent[1] = h*0.5f;
+}
+
+void nvgResetScissor(struct NVGcontext* ctx)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ memset(state->scissor.xform, 0, sizeof(state->scissor.xform));
+ state->scissor.extent[0] = 0;
+ state->scissor.extent[1] = 0;
+}
+
+static int nvg__ptEquals(float x1, float y1, float x2, float y2, float tol)
+{
+ float dx = x2 - x1;
+ float dy = y2 - y1;
+ return dx*dx + dy*dy < tol*tol;
+}
+
+static float nvg__distPtSeg(float x, float y, float px, float py, float qx, float qy)
+{
+ float pqx, pqy, dx, dy, d, t;
+ pqx = qx-px;
+ pqy = qy-py;
+ dx = x-px;
+ dy = y-py;
+ d = pqx*pqx + pqy*pqy;
+ t = pqx*dx + pqy*dy;
+ if (d > 0) t /= d;
+ if (t < 0) t = 0;
+ else if (t > 1) t = 1;
+ dx = px + t*pqx - x;
+ dy = py + t*pqy - y;
+ return dx*dx + dy*dy;
+}
+
+static void nvg__appendCommands(struct NVGcontext* ctx, float* vals, int nvals)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ int i;
+
+ if (ctx->ncommands+nvals > ctx->ccommands) {
+ float* commands;
+ int ccommands = ctx->ncommands+nvals + ctx->ccommands/2;
+ commands = (float*)realloc(ctx->commands, sizeof(float)*ccommands);
+ if (commands == NULL) return;
+ ctx->commands = commands;
+ ctx->ccommands = ccommands;
+ }
+
+ // transform commands
+ i = 0;
+ while (i < nvals) {
+ int cmd = (int)vals[i];
+ switch (cmd) {
+ case NVG_MOVETO:
+ nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+ i += 3;
+ break;
+ case NVG_LINETO:
+ nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+ i += 3;
+ break;
+ case NVG_BEZIERTO:
+ nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+ nvgTransformPoint(&vals[i+3],&vals[i+4], state->xform, vals[i+3],vals[i+4]);
+ nvgTransformPoint(&vals[i+5],&vals[i+6], state->xform, vals[i+5],vals[i+6]);
+ i += 7;
+ break;
+ case NVG_CLOSE:
+ i++;
+ break;
+ case NVG_WINDING:
+ i += 2;
+ break;
+ default:
+ i++;
+ }
+ }
+
+ memcpy(&ctx->commands[ctx->ncommands], vals, nvals*sizeof(float));
+
+ ctx->ncommands += nvals;
+
+ if ((int)vals[0] != NVG_CLOSE && (int)vals[0] != NVG_WINDING) {
+ ctx->commandx = vals[nvals-2];
+ ctx->commandy = vals[nvals-1];
+ }
+}
+
+
+static void nvg__clearPathCache(struct NVGcontext* ctx)
+{
+ ctx->cache->npoints = 0;
+ ctx->cache->npaths = 0;
+}
+
+static struct NVGpath* nvg__lastPath(struct NVGcontext* ctx)
+{
+ if (ctx->cache->npaths > 0)
+ return &ctx->cache->paths[ctx->cache->npaths-1];
+ return NULL;
+}
+
+static void nvg__addPath(struct NVGcontext* ctx)
+{
+ struct NVGpath* path;
+ if (ctx->cache->npaths+1 > ctx->cache->cpaths) {
+ struct NVGpath* paths;
+ int cpaths = ctx->cache->npaths+1 + ctx->cache->cpaths/2;
+ paths = (struct NVGpath*)realloc(ctx->cache->paths, sizeof(struct NVGpath)*cpaths);
+ if (paths == NULL) return;
+ ctx->cache->paths = paths;
+ ctx->cache->cpaths = cpaths;
+ }
+ path = &ctx->cache->paths[ctx->cache->npaths];
+ memset(path, 0, sizeof(*path));
+ path->first = ctx->cache->npoints;
+ path->winding = NVG_CCW;
+
+ ctx->cache->npaths++;
+}
+
+static struct NVGpoint* nvg__lastPoint(struct NVGcontext* ctx)
+{
+ if (ctx->cache->npoints > 0)
+ return &ctx->cache->points[ctx->cache->npoints-1];
+ return NULL;
+}
+
+static void nvg__addPoint(struct NVGcontext* ctx, float x, float y, int flags)
+{
+ struct NVGpath* path = nvg__lastPath(ctx);
+ struct NVGpoint* pt;
+ if (path == NULL) return;
+
+ if (ctx->cache->npoints > 0) {
+ pt = nvg__lastPoint(ctx);
+ if (nvg__ptEquals(pt->x,pt->y, x,y, ctx->distTol)) {
+ pt->flags |= flags;
+ return;
+ }
+ }
+
+ if (ctx->cache->npoints+1 > ctx->cache->cpoints) {
+ struct NVGpoint* points;
+ int cpoints = ctx->cache->npoints+1 + ctx->cache->cpoints/2;
+ points = (struct NVGpoint*)realloc(ctx->cache->points, sizeof(struct NVGpoint)*cpoints);
+ if (points == NULL) return;
+ ctx->cache->points = points;
+ ctx->cache->cpoints = cpoints;
+ }
+
+ pt = &ctx->cache->points[ctx->cache->npoints];
+ memset(pt, 0, sizeof(*pt));
+ pt->x = x;
+ pt->y = y;
+ pt->flags = flags;
+
+ ctx->cache->npoints++;
+ path->count++;
+}
+
+static void nvg__closePath(struct NVGcontext* ctx)
+{
+ struct NVGpath* path = nvg__lastPath(ctx);
+ if (path == NULL) return;
+ path->closed = 1;
+}
+
+static void nvg__pathWinding(struct NVGcontext* ctx, int winding)
+{
+ struct NVGpath* path = nvg__lastPath(ctx);
+ if (path == NULL) return;
+ path->winding = winding;
+}
+
+static float nvg__getAverageScale(float *t)
+{
+ float sx = sqrtf(t[0]*t[0] + t[2]*t[2]);
+ float sy = sqrtf(t[1]*t[1] + t[3]*t[3]);
+ return (sx + sy) * 0.5f;
+}
+
+static struct NVGvertex* nvg__allocTempVerts(struct NVGcontext* ctx, int nverts)
+{
+ if (nverts > ctx->cache->cverts) {
+ struct NVGvertex* verts;
+ int cverts = (nverts + 0xff) & ~0xff; // Round up to prevent allocations when things change just slightly.
+ verts = (struct NVGvertex*)realloc(ctx->cache->verts, sizeof(struct NVGvertex)*cverts);
+ if (verts == NULL) return NULL;
+ ctx->cache->verts = verts;
+ ctx->cache->cverts = cverts;
+ }
+
+ return ctx->cache->verts;
+}
+
+static float nvg__triarea2(float ax, float ay, float bx, float by, float cx, float cy)
+{
+ float abx = bx - ax;
+ float aby = by - ay;
+ float acx = cx - ax;
+ float acy = cy - ay;
+ return acx*aby - abx*acy;
+}
+
+static float nvg__polyArea(struct NVGpoint* pts, int npts)
+{
+ int i;
+ float area = 0;
+ for (i = 2; i < npts; i++) {
+ struct NVGpoint* a = &pts[0];
+ struct NVGpoint* b = &pts[i-1];
+ struct NVGpoint* c = &pts[i];
+ area += nvg__triarea2(a->x,a->y, b->x,b->y, c->x,c->y);
+ }
+ return area * 0.5f;
+}
+
+static void nvg__polyReverse(struct NVGpoint* pts, int npts)
+{
+ struct NVGpoint tmp;
+ int i = 0, j = npts-1;
+ while (i < j) {
+ tmp = pts[i];
+ pts[i] = pts[j];
+ pts[j] = tmp;
+ i++;
+ j--;
+ }
+}
+
+
+static void nvg__vset(struct NVGvertex* vtx, float x, float y, float u, float v)
+{
+ vtx->x = x;
+ vtx->y = y;
+ vtx->u = u;
+ vtx->v = v;
+}
+
+static void nvg__tesselateBezier(struct NVGcontext* ctx,
+ float x1, float y1, float x2, float y2,
+ float x3, float y3, float x4, float y4,
+ int level, int type)
+{
+ float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
+ float dx,dy,d2,d3;
+
+ if (level > 10) return;
+
+ x12 = (x1+x2)*0.5f;
+ y12 = (y1+y2)*0.5f;
+ x23 = (x2+x3)*0.5f;
+ y23 = (y2+y3)*0.5f;
+ x34 = (x3+x4)*0.5f;
+ y34 = (y3+y4)*0.5f;
+ x123 = (x12+x23)*0.5f;
+ y123 = (y12+y23)*0.5f;
+
+ dx = x3 - x1;
+ dy = y3 - y1;
+ d2 = nvg__absf(((x2 - x4) * dy - (y2 - y4) * dx));
+ d3 = nvg__absf(((x3 - x4) * dy - (y3 - y4) * dx));
+
+ if ((d2 + d3)*(d2 + d3) < ctx->tessTol * (dx*dx + dy*dy)) {
+ nvg__addPoint(ctx, x4, y4, type);
+ return;
+ }
+
+/* if (nvg__absf(x1+x3-x2-x2) + nvg__absf(y1+y3-y2-y2) + nvg__absf(x2+x4-x3-x3) + nvg__absf(y2+y4-y3-y3) < ctx->tessTol) {
+ nvg__addPoint(ctx, x4, y4, type);
+ return;
+ }*/
+
+ x234 = (x23+x34)*0.5f;
+ y234 = (y23+y34)*0.5f;
+ x1234 = (x123+x234)*0.5f;
+ y1234 = (y123+y234)*0.5f;
+
+ nvg__tesselateBezier(ctx, x1,y1, x12,y12, x123,y123, x1234,y1234, level+1, 0);
+ nvg__tesselateBezier(ctx, x1234,y1234, x234,y234, x34,y34, x4,y4, level+1, type);
+}
+
+static void nvg__flattenPaths(struct NVGcontext* ctx)
+{
+ struct NVGpathCache* cache = ctx->cache;
+// struct NVGstate* state = nvg__getState(ctx);
+ struct NVGpoint* last;
+ struct NVGpoint* p0;
+ struct NVGpoint* p1;
+ struct NVGpoint* pts;
+ struct NVGpath* path;
+ int i, j;
+ float* cp1;
+ float* cp2;
+ float* p;
+ float area;
+
+ if (cache->npaths > 0)
+ return;
+
+ // Flatten
+ i = 0;
+ while (i < ctx->ncommands) {
+ int cmd = (int)ctx->commands[i];
+ switch (cmd) {
+ case NVG_MOVETO:
+ nvg__addPath(ctx);
+ p = &ctx->commands[i+1];
+ nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER);
+ i += 3;
+ break;
+ case NVG_LINETO:
+ p = &ctx->commands[i+1];
+ nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER);
+ i += 3;
+ break;
+ case NVG_BEZIERTO:
+ last = nvg__lastPoint(ctx);
+ if (last != NULL) {
+ cp1 = &ctx->commands[i+1];
+ cp2 = &ctx->commands[i+3];
+ p = &ctx->commands[i+5];
+ nvg__tesselateBezier(ctx, last->x,last->y, cp1[0],cp1[1], cp2[0],cp2[1], p[0],p[1], 0, NVG_PT_CORNER);
+ }
+ i += 7;
+ break;
+ case NVG_CLOSE:
+ nvg__closePath(ctx);
+ i++;
+ break;
+ case NVG_WINDING:
+ nvg__pathWinding(ctx, (int)ctx->commands[i+1]);
+ i += 2;
+ break;
+ default:
+ i++;
+ }
+ }
+
+ cache->bounds[0] = cache->bounds[1] = 1e6f;
+ cache->bounds[2] = cache->bounds[3] = -1e6f;
+
+ // Calculate the direction and length of line segments.
+ for (j = 0; j < cache->npaths; j++) {
+ path = &cache->paths[j];
+ pts = &cache->points[path->first];
+
+ // If the first and last points are the same, remove the last, mark as closed path.
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+ if (nvg__ptEquals(p0->x,p0->y, p1->x,p1->y, ctx->distTol)) {
+ path->count--;
+ p0 = &pts[path->count-1];
+ path->closed = 1;
+ }
+
+ // Enforce winding.
+ if (path->count > 2) {
+ area = nvg__polyArea(pts, path->count);
+ if (path->winding == NVG_CCW && area < 0.0f)
+ nvg__polyReverse(pts, path->count);
+ if (path->winding == NVG_CW && area > 0.0f)
+ nvg__polyReverse(pts, path->count);
+ }
+
+ for(i = 0; i < path->count; ++i) {
+ // Calculate segment direction and length
+ p0->dx = p1->x - p0->x;
+ p0->dy = p1->y - p0->y;
+ p0->len = nvg__normalize(&p0->dx, &p0->dy);
+ // Update bounds
+ cache->bounds[0] = nvg__minf(cache->bounds[0], p0->x);
+ cache->bounds[1] = nvg__minf(cache->bounds[1], p0->y);
+ cache->bounds[2] = nvg__maxf(cache->bounds[2], p0->x);
+ cache->bounds[3] = nvg__maxf(cache->bounds[3], p0->y);
+ // Advance
+ p0 = p1++;
+ }
+ }
+}
+
+static int nvg__curveDivs(float r, float arc, float tol)
+{
+ float da = acosf(r / (r + tol)) * 2.0f;
+ return nvg__maxi(2, (int)ceilf(arc / da));
+}
+
+static void nvg__chooseBevel(int bevel, struct NVGpoint* p0, struct NVGpoint* p1, float w,
+ float* x0, float* y0, float* x1, float* y1)
+{
+ if (bevel) {
+ *x0 = p1->x + p0->dy * w;
+ *y0 = p1->y - p0->dx * w;
+ *x1 = p1->x + p1->dy * w;
+ *y1 = p1->y - p1->dx * w;
+ } else {
+ *x0 = p1->x + p1->dmx * w;
+ *y0 = p1->y + p1->dmy * w;
+ *x1 = p1->x + p1->dmx * w;
+ *y1 = p1->y + p1->dmy * w;
+ }
+}
+
+static struct NVGvertex* nvg__roundJoin(struct NVGvertex* dst, struct NVGpoint* p0, struct NVGpoint* p1,
+ float lw, float rw, float lu, float ru, int ncap, float fringe)
+{
+ int i, n;
+ float dlx0 = p0->dy;
+ float dly0 = -p0->dx;
+ float dlx1 = p1->dy;
+ float dly1 = -p1->dx;
+ NVG_NOTUSED(fringe);
+
+ if (p1->flags & NVG_PT_LEFT) {
+ float lx0,ly0,lx1,ly1,a0,a1;
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1);
+ a0 = atan2f(-dly0, -dlx0);
+ a1 = atan2f(-dly1, -dlx1);
+ if (a1 > a0) a1 -= NVG_PI*2;
+
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ n = nvg__clampi((int)ceilf(((a0 - a1) / NVG_PI) * ncap), 2, ncap);
+ for (i = 0; i < n; i++) {
+ float u = i/(float)(n-1);
+ float a = a0 + u*(a1-a0);
+ float rx = p1->x + cosf(a) * rw;
+ float ry = p1->y + sinf(a) * rw;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ nvg__vset(dst, rx, ry, ru,1); dst++;
+ }
+
+ nvg__vset(dst, lx1, ly1, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+
+ } else {
+ float rx0,ry0,rx1,ry1,a0,a1;
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1);
+ a0 = atan2f(dly0, dlx0);
+ a1 = atan2f(dly1, dlx1);
+ if (a1 < a0) a1 += NVG_PI*2;
+
+ nvg__vset(dst, p1->x + dlx0*rw, p1->y + dly0*rw, lu,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ n = nvg__clampi((int)ceilf(((a1 - a0) / NVG_PI) * ncap), 2, ncap);
+ for (i = 0; i < n; i++) {
+ float u = i/(float)(n-1);
+ float a = a0 + u*(a1-a0);
+ float lx = p1->x + cosf(a) * lw;
+ float ly = p1->y + sinf(a) * lw;
+ nvg__vset(dst, lx, ly, lu,1); dst++;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ }
+
+ nvg__vset(dst, p1->x + dlx1*rw, p1->y + dly1*rw, lu,1); dst++;
+ nvg__vset(dst, rx1, ry1, ru,1); dst++;
+
+ }
+ return dst;
+}
+
+static struct NVGvertex* nvg__bevelJoin(struct NVGvertex* dst, struct NVGpoint* p0, struct NVGpoint* p1,
+ float lw, float rw, float lu, float ru, float fringe)
+{
+ float rx0,ry0,rx1,ry1;
+ float lx0,ly0,lx1,ly1;
+ float mx,my,len,mu;
+ float dlx0 = p0->dy;
+ float dly0 = -p0->dx;
+ float dlx1 = p1->dy;
+ float dly1 = -p1->dx;
+ NVG_NOTUSED(fringe);
+
+ if (p1->flags & NVG_PT_LEFT) {
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1);
+
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ if (p1->flags & NVG_PT_BEVEL) {
+ // TODO: this needs more work.
+ mx = (dlx0 + dlx1) * 0.5f;
+ my = (dly0 + dly1) * 0.5f;
+ len = sqrtf(mx*mx + my*my);
+ mu = ru + len*(lu-ru)*0.5f;
+
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ nvg__vset(dst, lx1, ly1, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+ } else {
+ rx0 = p1->x - p1->dmx * rw;
+ ry0 = p1->y - p1->dmy * rw;
+
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+ }
+
+ nvg__vset(dst, lx1, ly1, lu,1); dst++;
+ nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+
+ } else {
+ nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1);
+
+ nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ if (p1->flags & NVG_PT_BEVEL) {
+ // TODO: this needs more work.
+ mx = (dlx0 + dlx1) * 0.5f;
+ my = (dly0 + dly1) * 0.5f;
+ len = sqrtf(mx*mx + my*my);
+ mu = lu + len*(ru-lu)*0.5f;
+
+ nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+ nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+ nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+ nvg__vset(dst, rx1, ry1, ru,1); dst++;
+ } else {
+ lx0 = p1->x + p1->dmx * lw;
+ ly0 = p1->y + p1->dmy * lw;
+
+ nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+ nvg__vset(dst, lx0, ly0, lu,1); dst++;
+
+ nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+ nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+ }
+
+ nvg__vset(dst, p1->x + dlx1*rw, p1->y + dly1*rw, lu,1); dst++;
+ nvg__vset(dst, rx1, ry1, ru,1); dst++;
+ }
+
+ return dst;
+
+ NVG_NOTUSED(mu);
+}
+
+static int nvg__expandStrokeAndFill(struct NVGcontext* ctx, int feats, float w, int lineCap, int lineJoin, float miterLimit)
+{
+ struct NVGpathCache* cache = ctx->cache;
+ struct NVGpath* path;
+ struct NVGpoint* pts;
+ struct NVGvertex* verts;
+ struct NVGvertex* dst;
+ struct NVGpoint* p0;
+ struct NVGpoint* p1;
+ int cverts, convex, i, j, s, e;
+ float wo = 0, iw = 0, aa = ctx->fringeWidth;
+ int ncap = nvg__curveDivs(w, NVG_PI, ctx->tessTol / 4.0f);
+ int nleft = 0;
+
+ if (w > 0.0f) iw = 1.0f / w;
+
+ // Calculate which joins needs extra vertices to append, and gather vertex count.
+ for (i = 0; i < cache->npaths; i++) {
+ path = &cache->paths[i];
+ pts = &cache->points[path->first];
+ path->nbevel = 0;
+ nleft = 0;
+
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+ for (j = 0; j < path->count; j++) {
+ float dlx0, dly0, dlx1, dly1, dmr2, cross, limit;
+ dlx0 = p0->dy;
+ dly0 = -p0->dx;
+ dlx1 = p1->dy;
+ dly1 = -p1->dx;
+ // Calculate extrusions
+ p1->dmx = (dlx0 + dlx1) * 0.5f;
+ p1->dmy = (dly0 + dly1) * 0.5f;
+ dmr2 = p1->dmx*p1->dmx + p1->dmy*p1->dmy;
+ if (dmr2 > 0.000001f) {
+ float scale = 1.0f / dmr2;
+ if (scale > 600.0f) {
+ scale = 600.0f;
+ }
+ p1->dmx *= scale;
+ p1->dmy *= scale;
+ }
+
+ // Clear flags, but keep the corner.
+ p1->flags = (p1->flags & NVG_PT_CORNER) ? NVG_PT_CORNER : 0;
+
+ // Keep track of left turns.
+ cross = p1->dx * p0->dy - p0->dx * p1->dy;
+ if (cross > 0.0f) {
+ nleft++;
+ p1->flags |= NVG_PT_LEFT;
+ }
+
+ // Calculate if we should use bevel or miter for inner join.
+ limit = nvg__maxf(1.01f, nvg__minf(p0->len, p1->len) * iw);
+ if ((dmr2 * limit*limit) < 1.0f)
+ p1->flags |= NVG_PR_INNERBEVEL;
+
+ // Check to see if the corner needs to be beveled.
+ if (p1->flags & NVG_PT_CORNER) {
+ if ((dmr2 * miterLimit*miterLimit) < 1.0f || lineJoin == NVG_BEVEL || lineJoin == NVG_ROUND) {
+ p1->flags |= NVG_PT_BEVEL;
+ }
+ }
+
+ if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0)
+ path->nbevel++;
+
+ p0 = p1++;
+ }
+
+ path->convex = (nleft == path->count) ? 1 : 0;
+ }
+
+ // Calculate max vertex usage.
+ cverts = 0;
+ for (i = 0; i < cache->npaths; i++) {
+ path = &cache->paths[i];
+ if (feats & NVG_FILL)
+ cverts += path->count + path->nbevel + 1;
+ if (feats & NVG_STROKE) {
+ int loop = ((feats & NVG_CAPS) && path->closed == 0) ? 0 : 1;
+ if (lineCap == NVG_ROUND)
+ cverts += (path->count + path->nbevel*(ncap+2) + 1) * 2; // plus one for loop
+ else
+ cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop
+ if (loop == 0) {
+ // space for caps
+ if (lineCap == NVG_ROUND) {
+ cverts += (ncap*2 + 2)*2;
+ } else {
+ cverts += (3+3)*2;
+ }
+ }
+ }
+ }
+
+ verts = nvg__allocTempVerts(ctx, cverts);
+ if (verts == NULL) return 0;
+
+ if ((feats & NVG_FILL) && cache->npaths == 1 && cache->paths[0].convex)
+ convex = 1;
+ else
+ convex = 0;
+
+ for (i = 0; i < cache->npaths; i++) {
+ path = &cache->paths[i];
+ pts = &cache->points[path->first];
+
+ // Calculate shape vertices.
+ if (feats & NVG_FILL) {
+ wo = 0.5f*aa;
+ dst = verts;
+ path->fill = dst;
+
+ if (w == 0.0f) {
+ for (j = 0; j < path->count; ++j) {
+ nvg__vset(dst, pts[j].x, pts[j].y, 0.5f,1);
+ dst++;
+ }
+ } else {
+ // Looping
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+ for (j = 0; j < path->count; ++j) {
+ if (p1->flags & NVG_PT_BEVEL) {
+ float dlx0 = p0->dy;
+ float dly0 = -p0->dx;
+ float dlx1 = p1->dy;
+ float dly1 = -p1->dx;
+ if (p1->flags & NVG_PT_LEFT) {
+ float lx = p1->x + p1->dmx * wo;
+ float ly = p1->y + p1->dmy * wo;
+ nvg__vset(dst, lx, ly, 0.5f,1); dst++;
+ } else {
+ float lx0 = p1->x + dlx0 * wo;
+ float ly0 = p1->y + dly0 * wo;
+ float lx1 = p1->x + dlx1 * wo;
+ float ly1 = p1->y + dly1 * wo;
+ nvg__vset(dst, lx0, ly0, 0.5f,1); dst++;
+ nvg__vset(dst, lx1, ly1, 0.5f,1); dst++;
+ }
+ } else {
+ nvg__vset(dst, p1->x + (p1->dmx * wo), p1->y + (p1->dmy * wo), 0.5f,1); dst++;
+ }
+ p0 = p1++;
+ }
+ }
+
+ path->nfill = (int)(dst - verts);
+ verts = dst;
+ } else {
+ wo = 0.0f;
+ path->fill = 0;
+ path->nfill = 0;
+ }
+
+ // Calculate fringe or stroke
+ if (feats & NVG_STROKE) {
+ float lw = w + wo, rw = w - wo;
+ float lu = 0, ru = 1;
+ int loop = ((feats & NVG_CAPS) && path->closed == 0) ? 0 : 1;
+ dst = verts;
+ path->stroke = dst;
+
+ // Create only half a fringe for convex shapes so that
+ // the shape can be rendered without stenciling.
+ if (convex) {
+ lw = wo; // This should generate the same vertex as fill inset above.
+ lu = 0.5f; // Set outline fade at middle.
+ }
+
+ if (loop) {
+ // Looping
+ p0 = &pts[path->count-1];
+ p1 = &pts[0];
+ s = 0;
+ e = path->count;
+ } else {
+ // Add cap
+ p0 = &pts[0];
+ p1 = &pts[1];
+ s = 1;
+ e = path->count-1;
+ }
+
+ if (loop == 0) {
+ // Add cap
+ float dx, dy, dlx, dly, px, py;
+ dx = p1->x - p0->x;
+ dy = p1->y - p0->y;
+ nvg__normalize(&dx, &dy);
+ dlx = dy;
+ dly = -dx;
+ if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE) {
+ if (lineCap == NVG_BUTT) {
+ px = p0->x;
+ py = p0->y;
+ } else /*if (lineCap == NVG_SQUARE)*/ {
+ px = p0->x - dx*w;
+ py = p0->y - dy*w;
+ }
+ nvg__vset(dst, px + dlx*lw - dx*aa, py + dly*lw - dy*aa, lu,0); dst++;
+ nvg__vset(dst, px - dlx*rw - dx*aa, py - dly*rw - dy*aa, ru,0); dst++;
+ nvg__vset(dst, px + dlx*lw, py + dly * lw, lu,1); dst++;
+ nvg__vset(dst, px - dlx*rw, py - dly * rw, ru,1); dst++;
+ } else if (lineCap == NVG_ROUND) {
+ px = p0->x;
+ py = p0->y;
+ for (j = 0; j < ncap; j++) {
+ float a = j/(float)(ncap-1)*NVG_PI;
+ float ax = cosf(a) * w, ay = sinf(a) * w;
+ nvg__vset(dst, px - dlx*ax - dx*ay, py - dly*ax - dy*ay, lu,1); dst++;
+ nvg__vset(dst, px, py, 0.5f,1); dst++;
+ }
+ nvg__vset(dst, px + dlx*lw, py + dly * lw, lu,1); dst++;
+ nvg__vset(dst, px - dlx*rw, py - dly * rw, ru,1); dst++;
+ }
+ }
+
+ for (j = s; j < e; ++j) {
+ if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) {
+ if (lineJoin == NVG_ROUND) {
+ dst = nvg__roundJoin(dst, p0, p1, lw, rw, lu, ru, ncap, ctx->fringeWidth);
+ } else {
+ dst = nvg__bevelJoin(dst, p0, p1, lw, rw, lu, ru, ctx->fringeWidth);
+ }
+ } else {
+ nvg__vset(dst, p1->x + (p1->dmx * lw), p1->y + (p1->dmy * lw), lu,1); dst++;
+ nvg__vset(dst, p1->x - (p1->dmx * rw), p1->y - (p1->dmy * rw), ru,1); dst++;
+ }
+ p0 = p1++;
+ }
+
+ if (loop) {
+ // Loop it
+ nvg__vset(dst, verts[0].x, verts[0].y, lu,1); dst++;
+ nvg__vset(dst, verts[1].x, verts[1].y, ru,1); dst++;
+ } else {
+ // Add cap
+ float dx, dy, dlx, dly, px, py;
+ dx = p1->x - p0->x;
+ dy = p1->y - p0->y;
+ nvg__normalize(&dx, &dy);
+ dlx = dy;
+ dly = -dx;
+ if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE) {
+ if (lineCap == NVG_BUTT) {
+ px = p1->x;
+ py = p1->y;
+ } else /*if (lineCap == NVG_SQUARE)*/ {
+ px = p1->x + dx*w;
+ py = p1->y + dy*w;
+ }
+ nvg__vset(dst, px + dlx*lw, py + dly * lw, lu,1); dst++;
+ nvg__vset(dst, px - dlx*rw, py - dly * rw, ru,1); dst++;
+ nvg__vset(dst, px + dlx*lw + dx*aa, py + dly*lw + dy*aa, lu,0); dst++;
+ nvg__vset(dst, px - dlx*rw + dx*aa, py - dly*rw + dy*aa, ru,0); dst++;
+ } else if (lineCap == NVG_ROUND) {
+ px = p1->x;
+ py = p1->y;
+ nvg__vset(dst, px + dlx*lw, py + dly * lw, lu,1); dst++;
+ nvg__vset(dst, px - dlx*rw, py - dly * rw, ru,1); dst++;
+ for (j = 0; j < ncap; j++) {
+ float a = j/(float)(ncap-1)*NVG_PI;
+ float ax = cosf(a) * w, ay = sinf(a) * w;
+ nvg__vset(dst, px, py, 0.5f,1); dst++;
+ nvg__vset(dst, px - dlx*ax + dx*ay, py - dly*ax + dy*ay, lu,1); dst++;
+ }
+ }
+ }
+
+ path->nstroke = (int)(dst - verts);
+
+ verts = dst;
+ } else {
+ path->stroke = 0;
+ path->nstroke = 0;
+ }
+ }
+
+ return 1;
+}
+
+
+// Draw
+void nvgBeginPath(struct NVGcontext* ctx)
+{
+ ctx->ncommands = 0;
+ nvg__clearPathCache(ctx);
+}
+
+void nvgMoveTo(struct NVGcontext* ctx, float x, float y)
+{
+ float vals[] = { NVG_MOVETO, x, y };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgLineTo(struct NVGcontext* ctx, float x, float y)
+{
+ float vals[] = { NVG_LINETO, x, y };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgBezierTo(struct NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y)
+{
+ float vals[] = { NVG_BEZIERTO, c1x, c1y, c2x, c2y, x, y };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgArcTo(struct NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius)
+{
+ float x0 = ctx->commandx;
+ float y0 = ctx->commandy;
+ float dx0,dy0, dx1,dy1, a, d, cx,cy, a0,a1;
+ int dir;
+
+ if (ctx->ncommands == 0) {
+ return;
+ }
+
+ // Handle degenerate cases.
+ if (nvg__ptEquals(x0,y0, x1,y1, ctx->distTol) ||
+ nvg__ptEquals(x1,y1, x2,y2, ctx->distTol) ||
+ nvg__distPtSeg(x1,y1, x0,y0, x2,y2) < ctx->distTol*ctx->distTol ||
+ radius < ctx->distTol) {
+ nvgLineTo(ctx, x1,y1);
+ return;
+ }
+
+ // Calculate tangential circle to lines (x0,y0)-(x1,y1) and (x1,y1)-(x2,y2).
+ dx0 = x0-x1;
+ dy0 = y0-y1;
+ dx1 = x2-x1;
+ dy1 = y2-y1;
+ nvg__normalize(&dx0,&dy0);
+ nvg__normalize(&dx1,&dy1);
+ a = nvg__acosf(dx0*dx1 + dy0*dy1);
+ d = radius / nvg__tanf(a/2.0f);
+
+// printf("a=%f° d=%f\n", a/NVG_PI*180.0f, d);
+
+ if (d > 10000.0f) {
+ nvgLineTo(ctx, x1,y1);
+ return;
+ }
+
+ if (nvg__cross(dx0,dy0, dx1,dy1) > 0.0f) {
+ cx = x1 + dx0*d + dy0*radius;
+ cy = y1 + dy0*d + -dx0*radius;
+ a0 = nvg__atan2f(dx0, -dy0);
+ a1 = nvg__atan2f(-dx1, dy1);
+ dir = NVG_CW;
+// printf("CW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f);
+ } else {
+ cx = x1 + dx0*d + -dy0*radius;
+ cy = y1 + dy0*d + dx0*radius;
+ a0 = nvg__atan2f(-dx0, dy0);
+ a1 = nvg__atan2f(dx1, -dy1);
+ dir = NVG_CCW;
+// printf("CCW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f);
+ }
+
+ nvgArc(ctx, cx, cy, radius, a0, a1, dir);
+}
+
+void nvgClosePath(struct NVGcontext* ctx)
+{
+ float vals[] = { NVG_CLOSE };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgPathWinding(struct NVGcontext* ctx, int dir)
+{
+ float vals[] = { NVG_WINDING, (float)dir };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgArc(struct NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir)
+{
+ float a = 0, da = 0, hda = 0, kappa = 0;
+ float dx = 0, dy = 0, x = 0, y = 0, tanx = 0, tany = 0;
+ float px = 0, py = 0, ptanx = 0, ptany = 0;
+ float vals[3 + 5*7 + 100];
+ int i, ndivs, nvals;
+ int move = ctx->ncommands > 0 ? NVG_LINETO : NVG_MOVETO;
+
+ // Clamp angles
+ da = a1 - a0;
+ if (dir == NVG_CW) {
+ if (nvg__absf(da) >= NVG_PI*2) {
+ da = NVG_PI*2;
+ } else {
+ while (da < 0.0f) da += NVG_PI*2;
+ }
+ } else {
+ if (nvg__absf(da) >= NVG_PI*2) {
+ da = -NVG_PI*2;
+ } else {
+ while (da > 0.0f) da -= NVG_PI*2;
+ }
+ }
+
+ // Split arc into max 90 degree segments.
+ ndivs = nvg__maxi(1, nvg__mini((int)(nvg__absf(da) / (NVG_PI*0.5f) + 0.5f), 5));
+ hda = (da / (float)ndivs) / 2.0f;
+ kappa = nvg__absf(4.0f / 3.0f * (1.0f - nvg__cosf(hda)) / nvg__sinf(hda));
+
+ if (dir == NVG_CCW)
+ kappa = -kappa;
+
+ nvals = 0;
+ for (i = 0; i <= ndivs; i++) {
+ a = a0 + da * (i/(float)ndivs);
+ dx = nvg__cosf(a);
+ dy = nvg__sinf(a);
+ x = cx + dx*r;
+ y = cy + dy*r;
+ tanx = -dy*r*kappa;
+ tany = dx*r*kappa;
+
+ if (i == 0) {
+ vals[nvals++] = (float)move;
+ vals[nvals++] = x;
+ vals[nvals++] = y;
+ } else {
+ vals[nvals++] = NVG_BEZIERTO;
+ vals[nvals++] = px+ptanx;
+ vals[nvals++] = py+ptany;
+ vals[nvals++] = x-tanx;
+ vals[nvals++] = y-tany;
+ vals[nvals++] = x;
+ vals[nvals++] = y;
+ }
+ px = x;
+ py = y;
+ ptanx = tanx;
+ ptany = tany;
+ }
+
+ nvg__appendCommands(ctx, vals, nvals);
+}
+
+void nvgRect(struct NVGcontext* ctx, float x, float y, float w, float h)
+{
+ float vals[] = {
+ NVG_MOVETO, x,y,
+ NVG_LINETO, x+w,y,
+ NVG_LINETO, x+w,y+h,
+ NVG_LINETO, x,y+h,
+ NVG_CLOSE
+ };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgRoundedRect(struct NVGcontext* ctx, float x, float y, float w, float h, float r)
+{
+ if (r < 0.1f) {
+ nvgRect(ctx, x,y,w,h);
+ return;
+ }
+ else {
+ float vals[] = {
+ NVG_MOVETO, x+r, y,
+ NVG_LINETO, x+w-r, y,
+ NVG_BEZIERTO, x+w-r*(1-NVG_KAPPA90), y, x+w, y+r*(1-NVG_KAPPA90), x+w, y+r,
+ NVG_LINETO, x+w, y+h-r,
+ NVG_BEZIERTO, x+w, y+h-r*(1-NVG_KAPPA90), x+w-r*(1-NVG_KAPPA90), y+h, x+w-r, y+h,
+ NVG_LINETO, x+r, y+h,
+ NVG_BEZIERTO, x+r*(1-NVG_KAPPA90), y+h, x, y+h-r*(1-NVG_KAPPA90), x, y+h-r,
+ NVG_LINETO, x, y+r,
+ NVG_BEZIERTO, x, y+r*(1-NVG_KAPPA90), x+r*(1-NVG_KAPPA90), y, x+r, y,
+ NVG_CLOSE
+ };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+ }
+}
+
+void nvgEllipse(struct NVGcontext* ctx, float cx, float cy, float rx, float ry)
+{
+ float vals[] = {
+ NVG_MOVETO, cx+rx, cy,
+ NVG_BEZIERTO, cx+rx, cy+ry*NVG_KAPPA90, cx+rx*NVG_KAPPA90, cy+ry, cx, cy+ry,
+ NVG_BEZIERTO, cx-rx*NVG_KAPPA90, cy+ry, cx-rx, cy+ry*NVG_KAPPA90, cx-rx, cy,
+ NVG_BEZIERTO, cx-rx, cy-ry*NVG_KAPPA90, cx-rx*NVG_KAPPA90, cy-ry, cx, cy-ry,
+ NVG_BEZIERTO, cx+rx*NVG_KAPPA90, cy-ry, cx+rx, cy-ry*NVG_KAPPA90, cx+rx, cy,
+ NVG_CLOSE
+ };
+ nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgCircle(struct NVGcontext* ctx, float cx, float cy, float r)
+{
+ nvgEllipse(ctx, cx,cy, r,r);
+}
+
+void nvgDebugDumpPathCache(struct NVGcontext* ctx)
+{
+ const struct NVGpath* path;
+ int i, j;
+
+ printf("Dumping %d cached paths\n", ctx->cache->npaths);
+ for (i = 0; i < ctx->cache->npaths; i++) {
+ path = &ctx->cache->paths[i];
+ printf(" - Path %d\n", i);
+ if (path->nfill) {
+ printf(" - fill: %d\n", path->nfill);
+ for (j = 0; j < path->nfill; j++)
+ printf("%f\t%f\n", path->fill[j].x, path->fill[j].y);
+ }
+ if (path->nstroke) {
+ printf(" - stroke: %d\n", path->nstroke);
+ for (j = 0; j < path->nstroke; j++)
+ printf("%f\t%f\n", path->stroke[j].x, path->stroke[j].y);
+ }
+ }
+}
+
+void nvgFill(struct NVGcontext* ctx)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ const struct NVGpath* path;
+ int i;
+
+ nvg__flattenPaths(ctx);
+ if (ctx->params.edgeAntiAlias)
+ nvg__expandStrokeAndFill(ctx, NVG_FILL|NVG_STROKE, ctx->fringeWidth, NVG_BUTT, NVG_MITER, 3.6f);
+ else
+ nvg__expandStrokeAndFill(ctx, NVG_FILL, 0.0f, NVG_BUTT, NVG_MITER, 1.2f);
+
+ ctx->params.renderFill(ctx->params.userPtr, &state->fill, &state->scissor, ctx->fringeWidth,
+ ctx->cache->bounds, ctx->cache->paths, ctx->cache->npaths);
+
+ // Count triangles
+ for (i = 0; i < ctx->cache->npaths; i++) {
+ path = &ctx->cache->paths[i];
+ ctx->fillTriCount += path->nfill-2;
+ ctx->fillTriCount += path->nstroke-2;
+ ctx->drawCallCount += 2;
+ }
+}
+
+void nvgStroke(struct NVGcontext* ctx)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getAverageScale(state->xform);
+ float strokeWidth = nvg__clampf(state->strokeWidth * scale, 0.0f, 20.0f);
+ struct NVGpaint strokePaint = state->stroke;
+ const struct NVGpath* path;
+ int i;
+
+ if (strokeWidth < ctx->fringeWidth) {
+ // If the stroke width is less than pixel size, use alpha to emulate coverate.
+ // Since coverage is area, scale by alpha*alpha.
+ float alpha = nvg__clampf(strokeWidth / ctx->fringeWidth, 0.0f, 1.0f);
+ strokePaint.innerColor.a *= alpha*alpha;
+ strokePaint.outerColor.a *= alpha*alpha;
+ strokeWidth = ctx->fringeWidth;
+ }
+
+ nvg__flattenPaths(ctx);
+ if (ctx->params.edgeAntiAlias)
+ nvg__expandStrokeAndFill(ctx, NVG_STROKE|NVG_CAPS, strokeWidth*0.5f + ctx->fringeWidth*0.5f, state->lineCap, state->lineJoin, state->miterLimit);
+ else
+ nvg__expandStrokeAndFill(ctx, NVG_STROKE|NVG_CAPS, strokeWidth*0.5f, state->lineCap, state->lineJoin, state->miterLimit);
+
+ ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, &state->scissor, ctx->fringeWidth,
+ strokeWidth, ctx->cache->paths, ctx->cache->npaths);
+
+ // Count triangles
+ for (i = 0; i < ctx->cache->npaths; i++) {
+ path = &ctx->cache->paths[i];
+ ctx->strokeTriCount += path->nstroke-2;
+ ctx->drawCallCount++;
+ }
+}
+
+// Add fonts
+int nvgCreateFont(struct NVGcontext* ctx, const char* name, const char* path)
+{
+ return fonsAddFont(ctx->fs, name, path);
+}
+
+int nvgCreateFontMem(struct NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData)
+{
+ return fonsAddFontMem(ctx->fs, name, data, ndata, freeData);
+}
+
+int nvgFindFont(struct NVGcontext* ctx, const char* name)
+{
+ if (name == NULL) return -1;
+ return fonsGetFontByName(ctx->fs, name);
+}
+
+// State setting
+void nvgFontSize(struct NVGcontext* ctx, float size)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->fontSize = size;
+}
+
+void nvgFontBlur(struct NVGcontext* ctx, float blur)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->fontBlur = blur;
+}
+
+void nvgTextLetterSpacing(struct NVGcontext* ctx, float spacing)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->letterSpacing = spacing;
+}
+
+void nvgTextLineHeight(struct NVGcontext* ctx, float lineHeight)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->lineHeight = lineHeight;
+}
+
+void nvgTextAlign(struct NVGcontext* ctx, int align)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->textAlign = align;
+}
+
+void nvgFontFaceId(struct NVGcontext* ctx, int font)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->fontId = font;
+}
+
+void nvgFontFace(struct NVGcontext* ctx, const char* font)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ state->fontId = fonsGetFontByName(ctx->fs, font);
+}
+
+static float nvg__quantize(float a, float d)
+{
+ return ((int)(a / d + 0.5f)) * d;
+}
+
+static float nvg__getFontScale(struct NVGstate* state)
+{
+ return nvg__minf(nvg__quantize(nvg__getAverageScale(state->xform), 0.01f), 4.0f);
+}
+
+float nvgText(struct NVGcontext* ctx, float x, float y, const char* string, const char* end)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ struct NVGpaint paint;
+ struct FONStextIter iter;
+ struct FONSquad q;
+ struct NVGvertex* verts;
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ int dirty[4];
+ int cverts = 0;
+ int nverts = 0;
+
+ if (end == NULL)
+ end = string + strlen(string);
+
+ if (state->fontId == FONS_INVALID) return x;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ cverts = nvg__maxi(2, (int)(end - string)) * 6; // conservative estimate.
+ verts = nvg__allocTempVerts(ctx, cverts);
+ if (verts == NULL) return x;
+
+ fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end);
+ while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+ // Trasnform corners.
+ float c[4*2];
+ nvgTransformPoint(&c[0],&c[1], state->xform, q.x0*invscale, q.y0*invscale);
+ nvgTransformPoint(&c[2],&c[3], state->xform, q.x1*invscale, q.y0*invscale);
+ nvgTransformPoint(&c[4],&c[5], state->xform, q.x1*invscale, q.y1*invscale);
+ nvgTransformPoint(&c[6],&c[7], state->xform, q.x0*invscale, q.y1*invscale);
+ // Create triangles
+ if (nverts+6 <= cverts) {
+ nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++;
+ nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++;
+ nvg__vset(&verts[nverts], c[2], c[3], q.s1, q.t0); nverts++;
+ nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++;
+ nvg__vset(&verts[nverts], c[6], c[7], q.s0, q.t1); nverts++;
+ nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++;
+ }
+ }
+
+ // TODO: add back-end bit to do this just once per frame.
+ if (fonsValidateTexture(ctx->fs, dirty)) {
+ // Update texture
+ if (ctx->fontImage != 0) {
+ int iw, ih;
+ const unsigned char* data = fonsGetTextureData(ctx->fs, &iw, &ih);
+ int x = dirty[0];
+ int y = dirty[1];
+ int w = dirty[2] - dirty[0];
+ int h = dirty[3] - dirty[1];
+ ctx->params.renderUpdateTexture(ctx->params.userPtr, ctx->fontImage, x,y, w,h, data);
+ }
+ }
+
+ // Render triangles.
+ paint = state->fill;
+ paint.image = ctx->fontImage;
+ ctx->params.renderTriangles(ctx->params.userPtr, &paint, &state->scissor, verts, nverts);
+
+ ctx->drawCallCount++;
+ ctx->textTriCount += nverts/3;
+
+ return iter.x;
+}
+
+void nvgTextBox(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ struct NVGtextRow rows[2];
+ int nrows = 0, i;
+ int oldAlign = state->textAlign;
+ int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT);
+ int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE);
+ float lineh = 0;
+
+ if (state->fontId == FONS_INVALID) return;
+
+ nvgTextMetrics(ctx, NULL, NULL, &lineh);
+
+ state->textAlign = NVG_ALIGN_LEFT | valign;
+
+ while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) {
+ for (i = 0; i < nrows; i++) {
+ struct NVGtextRow* row = &rows[i];
+ if (haling & NVG_ALIGN_LEFT)
+ nvgText(ctx, x, y, row->start, row->end);
+ else if (haling & NVG_ALIGN_CENTER)
+ nvgText(ctx, x + breakRowWidth*0.5f - row->width*0.5f, y, row->start, row->end);
+ else if (haling & NVG_ALIGN_RIGHT)
+ nvgText(ctx, x + breakRowWidth - row->width, y, row->start, row->end);
+ y += lineh * state->lineHeight;
+ }
+ string = rows[nrows-1].next;
+ }
+
+ state->textAlign = oldAlign;
+}
+
+int nvgTextGlyphPositions(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, struct NVGglyphPosition* positions, int maxPositions)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ struct FONStextIter iter;
+ struct FONSquad q;
+ int npos = 0;
+
+ if (state->fontId == FONS_INVALID) return 0;
+
+ if (end == NULL)
+ end = string + strlen(string);
+
+ if (string == end)
+ return 0;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end);
+ while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+ positions[npos].str = iter.str;
+ positions[npos].x = iter.x * invscale;
+ positions[npos].minx = q.x0 * invscale;
+ positions[npos].maxx = q.x1 * invscale;
+ npos++;
+ if (npos >= maxPositions)
+ break;
+ }
+
+ return npos;
+}
+
+enum NVGcodepointType {
+ NVG_SPACE,
+ NVG_NEWLINE,
+ NVG_CHAR,
+};
+
+int nvgTextBreakLines(struct NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, struct NVGtextRow* rows, int maxRows)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ struct FONStextIter iter;
+ struct FONSquad q;
+ int nrows = 0;
+ float rowStartX = 0;
+ float rowWidth = 0;
+ float rowMinX = 0;
+ float rowMaxX = 0;
+ const char* rowStart = NULL;
+ const char* rowEnd = NULL;
+ const char* wordStart = NULL;
+ float wordStartX = 0;
+ float wordMinX = 0;
+ const char* breakEnd = NULL;
+ float breakWidth = 0;
+ float breakMaxX = 0;
+ int type = NVG_SPACE, ptype = NVG_SPACE;
+ unsigned int pcodepoint = 0;
+
+ if (maxRows == 0) return 0;
+ if (state->fontId == FONS_INVALID) return 0;
+
+ if (end == NULL)
+ end = string + strlen(string);
+
+ if (string == end) return 0;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ breakRowWidth *= scale;
+
+ fonsTextIterInit(ctx->fs, &iter, 0, 0, string, end);
+ while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+ switch (iter.codepoint) {
+ case 9: // \t
+ case 11: // \v
+ case 12: // \f
+ case 32: // space
+ case 0x00a0: // NBSP
+ type = NVG_SPACE;
+ break;
+ case 10: // \n
+ type = pcodepoint == 13 ? NVG_SPACE : NVG_NEWLINE;
+ break;
+ case 13: // \r
+ type = pcodepoint == 10 ? NVG_SPACE : NVG_NEWLINE;
+ break;
+ case 0x0085: // NEL
+ type = NVG_NEWLINE;
+ break;
+ default:
+ type = NVG_CHAR;
+ break;
+ }
+
+ if (type == NVG_NEWLINE) {
+ // Always handle new lines.
+ rows[nrows].start = rowStart != NULL ? rowStart : iter.str;
+ rows[nrows].end = rowEnd != NULL ? rowEnd : iter.str;
+ rows[nrows].width = rowWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = rowMaxX * invscale;
+ rows[nrows].next = iter.next;
+ nrows++;
+ if (nrows >= maxRows)
+ return nrows;
+ // Set null break point
+ breakEnd = rowStart;
+ breakWidth = 0.0;
+ breakMaxX = 0.0;
+ // Indicate to skip the white space at the beginning of the row.
+ rowStart = NULL;
+ rowEnd = NULL;
+ rowWidth = 0;
+ rowMinX = rowMaxX = 0;
+ } else {
+ if (rowStart == NULL) {
+ // Skip white space until the beginning of the line
+ if (type == NVG_CHAR) {
+ // The current char is the row so far
+ rowStartX = iter.x;
+ rowStart = iter.str;
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX; // q.x1 - rowStartX;
+ rowMinX = q.x0 - rowStartX;
+ rowMaxX = q.x1 - rowStartX;
+ wordStart = iter.str;
+ wordStartX = iter.x;
+ wordMinX = q.x0 - rowStartX;
+ // Set null break point
+ breakEnd = rowStart;
+ breakWidth = 0.0;
+ breakMaxX = 0.0;
+ }
+ } else {
+ float nextWidth = iter.nextx - rowStartX; //q.x1 - rowStartX;
+
+ if (nextWidth > breakRowWidth) {
+ // The run length is too long, need to break to new line.
+ if (breakEnd == rowStart) {
+ // The current word is longer than the row length, just break it from here.
+ rows[nrows].start = rowStart;
+ rows[nrows].end = iter.str;
+ rows[nrows].width = rowWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = rowMaxX * invscale;
+ rows[nrows].next = iter.str;
+ nrows++;
+ if (nrows >= maxRows)
+ return nrows;
+ rowStartX = iter.x;
+ rowStart = iter.str;
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX;
+ rowMinX = q.x0 - rowStartX;
+ rowMaxX = q.x1 - rowStartX;
+ wordStart = iter.str;
+ wordStartX = iter.x;
+ wordMinX = q.x0 - rowStartX;
+ } else {
+ // Break the line from the end of the last word, and start new line from the begining of the new.
+ rows[nrows].start = rowStart;
+ rows[nrows].end = breakEnd;
+ rows[nrows].width = breakWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = breakMaxX * invscale;
+ rows[nrows].next = wordStart;
+ nrows++;
+ if (nrows >= maxRows)
+ return nrows;
+ rowStartX = wordStartX;
+ rowStart = wordStart;
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX; // q.x1 - rowStartX;
+ rowMinX = wordMinX;
+ rowMaxX = q.x1 - rowStartX;
+ // No change to the word start
+ }
+ // Set null break point
+ breakEnd = rowStart;
+ breakWidth = 0.0;
+ breakMaxX = 0.0;
+ }
+
+ // track last non-white space character
+ if (type == NVG_CHAR) {
+ rowEnd = iter.next;
+ rowWidth = iter.nextx - rowStartX; // q.x1 - rowStartX;
+ rowMaxX = q.x1 - rowStartX;
+ }
+ // track last end of a word
+ if (ptype == NVG_CHAR && (type == NVG_SPACE || type == NVG_SPACE)) {
+ breakEnd = iter.str;
+ breakWidth = rowWidth;
+ breakMaxX = rowMaxX;
+ }
+ // track last beginning of a word
+ if ((ptype == NVG_SPACE || ptype == NVG_SPACE) && type == NVG_CHAR) {
+ wordStart = iter.str;
+ wordStartX = iter.x;
+ wordMinX = q.x0 - rowStartX;
+ }
+ }
+ }
+
+ pcodepoint = iter.codepoint;
+ ptype = type;
+ }
+
+ // Break the line from the end of the last word, and start new line from the begining of the new.
+ if (rowStart != NULL) {
+ rows[nrows].start = rowStart;
+ rows[nrows].end = rowEnd;
+ rows[nrows].width = rowWidth * invscale;
+ rows[nrows].minx = rowMinX * invscale;
+ rows[nrows].maxx = rowMaxX * invscale;
+ rows[nrows].next = end;
+ nrows++;
+ }
+
+ return nrows;
+}
+
+float nvgTextBounds(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ float width;
+
+ if (state->fontId == FONS_INVALID) return 0;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ width = fonsTextBounds(ctx->fs, x, y, string, end, bounds);
+ if (bounds != NULL) {
+ bounds[0] *= invscale;
+ bounds[1] *= invscale;
+ bounds[2] *= invscale;
+ bounds[3] *= invscale;
+ }
+ return width * invscale;
+}
+
+void nvgTextBoxBounds(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ struct NVGtextRow rows[2];
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+ int nrows = 0, i;
+ int oldAlign = state->textAlign;
+ int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT);
+ int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE);
+ float lineh = 0, rminy = 0, rmaxy = 0;
+ float minx, miny, maxx, maxy;
+
+ if (state->fontId == FONS_INVALID) {
+ if (bounds != NULL)
+ bounds[0] = bounds[1] = bounds[2] = bounds[3] = 0.0f;
+ return;
+ }
+
+ nvgTextMetrics(ctx, NULL, NULL, &lineh);
+
+ nvgTextMetrics(ctx, NULL, NULL, &lineh);
+
+ state->textAlign = NVG_ALIGN_LEFT | valign;
+
+ minx = maxx = x;
+ miny = maxy = y;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+ fonsLineBounds(ctx->fs, 0, &rminy, &rmaxy);
+ rminy *= invscale;
+ rmaxy *= invscale;
+
+ while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) {
+ for (i = 0; i < nrows; i++) {
+ struct NVGtextRow* row = &rows[i];
+ float rminx, rmaxx, dx = 0;
+ // Horizontal bounds
+ if (haling & NVG_ALIGN_LEFT)
+ dx = 0;
+ else if (haling & NVG_ALIGN_CENTER)
+ dx = breakRowWidth*0.5f - row->width*0.5f;
+ else if (haling & NVG_ALIGN_RIGHT)
+ dx = breakRowWidth - row->width;
+ rminx = x + row->minx + dx;
+ rmaxx = x + row->maxx + dx;
+ minx = nvg__minf(minx, rminx);
+ maxx = nvg__maxf(maxx, rmaxx);
+ // Vertical bounds.
+ miny = nvg__minf(miny, y + rminy);
+ maxy = nvg__maxf(maxy, y + rmaxy);
+
+ y += lineh * state->lineHeight;
+ }
+ string = rows[nrows-1].next;
+ }
+
+ state->textAlign = oldAlign;
+
+ if (bounds != NULL) {
+ bounds[0] = minx;
+ bounds[1] = miny;
+ bounds[2] = maxx;
+ bounds[3] = maxy;
+ }
+}
+
+void nvgTextMetrics(struct NVGcontext* ctx, float* ascender, float* descender, float* lineh)
+{
+ struct NVGstate* state = nvg__getState(ctx);
+ float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+ float invscale = 1.0f / scale;
+
+ if (state->fontId == FONS_INVALID) return;
+
+ fonsSetSize(ctx->fs, state->fontSize*scale);
+ fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+ fonsSetBlur(ctx->fs, state->fontBlur*scale);
+ fonsSetAlign(ctx->fs, state->textAlign);
+ fonsSetFont(ctx->fs, state->fontId);
+
+ fonsVertMetrics(ctx->fs, ascender, descender, lineh);
+ if (ascender != NULL)
+ *ascender *= invscale;
+ if (descender != NULL)
+ *descender *= invscale;
+ if (lineh != NULL)
+ *lineh *= invscale;
+}
diff --git a/dgl/src/nanovg/nanovg.h b/dgl/src/nanovg/nanovg.h
@@ -0,0 +1,590 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#ifndef NANOVG_H
+#define NANOVG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NVG_PI 3.14159265358979323846264338327f
+
+struct NVGcontext;
+
+struct NVGcolor {
+ union {
+ float rgba[4];
+ struct {
+ float r,g,b,a;
+ };
+ };
+};
+
+struct NVGpaint {
+ float xform[6];
+ float extent[2];
+ float radius;
+ float feather;
+ struct NVGcolor innerColor;
+ struct NVGcolor outerColor;
+ int image;
+ int repeat;
+};
+
+enum NVGwinding {
+ NVG_CCW = 1, // Winding for solid shapes
+ NVG_CW = 2, // Winding for holes
+};
+
+enum NVGsolidity {
+ NVG_SOLID = 1, // CCW
+ NVG_HOLE = 2, // CW
+};
+
+enum NVGlineCap {
+ NVG_BUTT,
+ NVG_ROUND,
+ NVG_SQUARE,
+ NVG_BEVEL,
+ NVG_MITER,
+};
+
+enum NVGpatternRepeat {
+ NVG_REPEATX = 0x01, // Repeat image pattern in X direction
+ NVG_REPEATY = 0x02, // Repeat image pattern in Y direction
+};
+
+enum NVGalign {
+ // Horizontal align
+ NVG_ALIGN_LEFT = 1<<0, // Default, align text horizontally to left.
+ NVG_ALIGN_CENTER = 1<<1, // Align text horizontally to center.
+ NVG_ALIGN_RIGHT = 1<<2, // Align text horizontally to right.
+ // Vertical align
+ NVG_ALIGN_TOP = 1<<3, // Align text vertically to top.
+ NVG_ALIGN_MIDDLE = 1<<4, // Align text vertically to middle.
+ NVG_ALIGN_BOTTOM = 1<<5, // Align text vertically to bottom.
+ NVG_ALIGN_BASELINE = 1<<6, // Default, align text vertically to baseline.
+};
+
+enum NVGalpha {
+ NVG_STRAIGHT_ALPHA,
+ NVG_PREMULTIPLIED_ALPHA,
+};
+
+struct NVGglyphPosition {
+ const char* str; // Position of the glyph in the input string.
+ float x; // The x-coordinate of the logical glyph position.
+ float minx, maxx; // The bounds of the glyph shape.
+};
+
+struct NVGtextRow {
+ const char* start; // Pointer to the input text where the row starts.
+ const char* end; // Pointer to the input text where the row ends (one past the last character).
+ const char* next; // Pointer to the beginning of the next row.
+ float width; // Logical width of the row.
+ float minx, maxx; // Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending.
+};
+
+
+// Begin drawing a new frame
+// Calls to nanovg drawing API should be wrapped in nvgBeginFrame() & nvgEndFrame()
+// nvgBeginFrame() defines the size of the window to render to in relation currently
+// set viewport (i.e. glViewport on GL backends). Device pixel ration allows to
+// control the rendering on Hi-DPI devices.
+// For example, GLFW returns two dimension for an opened window: window size and
+// frame buffer size. In that case you would set windowWidth/Height to the window size
+// devicePixelRatio to: frameBufferWidth / windowWidth.
+// AlphaBlend controls if drawing the shapes to the render target should be done using straight or
+// premultiplied alpha. If rendering directly to framebuffer you probably want to use NVG_STRAIGHT_ALPHA,
+// if rendering to texture which should contain transparent regions NVG_PREMULTIPLIED_ALPHA is the
+// right choice.
+void nvgBeginFrame(struct NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio, int alphaBlend);
+
+// Ends drawing flushing remaining render state.
+void nvgEndFrame(struct NVGcontext* ctx);
+
+//
+// Color utils
+//
+// Colors in NanoVG are stored as unsigned ints in ABGR format.
+
+// Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f).
+struct NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b);
+
+// Returns a color value from red, green, blue values. Alpha will be set to 1.0f.
+struct NVGcolor nvgRGBf(float r, float g, float b);
+
+
+// Returns a color value from red, green, blue and alpha values.
+struct NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
+
+// Returns a color value from red, green, blue and alpha values.
+struct NVGcolor nvgRGBAf(float r, float g, float b, float a);
+
+
+// Linearly interpoaltes from color c0 to c1, and returns resulting color value.
+struct NVGcolor nvgLerpRGBA(struct NVGcolor c0, struct NVGcolor c1, float u);
+
+// Sets transparency of a color value.
+struct NVGcolor nvgTransRGBA(struct NVGcolor c0, unsigned char a);
+
+// Sets transparency of a color value.
+struct NVGcolor nvgTransRGBAf(struct NVGcolor c0, float a);
+
+// Returns color value specified by hue, saturation and lightness.
+// HSL values are all in range [0..1], alpha will be set to 255.
+struct NVGcolor nvgHSL(float h, float s, float l);
+
+// Returns color value specified by hue, saturation and lightness and alpha.
+// HSL values are all in range [0..1], alpha in range [0..255]
+struct NVGcolor nvgHSLA(float h, float s, float l, unsigned char a);
+
+//
+// State Handling
+//
+// NanoVG contains state which represents how paths will be rendered.
+// The state contains transform, fill and stroke styles, text and font styles,
+// and scissor clipping.
+
+// Pushes and saves the current render state into a state stack.
+// A matching nvgRestore() must be used to restore the state.
+void nvgSave(struct NVGcontext* ctx);
+
+// Pops and restores current render state.
+void nvgRestore(struct NVGcontext* ctx);
+
+// Resets current render state to default values. Does not affect the render state stack.
+void nvgReset(struct NVGcontext* ctx);
+
+//
+// Render styles
+//
+// Fill and stroke render style can be either a solid color or a paint which is a gradient or a pattern.
+// Solid color is simply defined as a color value, different kinds of paints can be created
+// using nvgLinearGradient(), nvgBoxGradient(), nvgRadialGradient() and nvgImagePattern().
+//
+// Current render style can be saved and restored using nvgSave() and nvgRestore().
+
+// Sets current stroke style to a solid color.
+void nvgStrokeColor(struct NVGcontext* ctx, struct NVGcolor color);
+
+// Sets current stroke style to a paint, which can be a one of the gradients or a pattern.
+void nvgStrokePaint(struct NVGcontext* ctx, struct NVGpaint paint);
+
+// Sets current fill cstyle to a solid color.
+void nvgFillColor(struct NVGcontext* ctx, struct NVGcolor color);
+
+// Sets current fill style to a paint, which can be a one of the gradients or a pattern.
+void nvgFillPaint(struct NVGcontext* ctx, struct NVGpaint paint);
+
+// Sets the miter limit of the stroke style.
+// Miter limit controls when a sharp corner is beveled.
+void nvgMiterLimit(struct NVGcontext* ctx, float limit);
+
+// Sets the stroke witdth of the stroke style.
+void nvgStrokeWidth(struct NVGcontext* ctx, float size);
+
+// Sets how the end of the line (cap) is drawn,
+// Can be one of: NVG_BUTT (default), NVG_ROUND, NVG_SQUARE.
+void nvgLineCap(struct NVGcontext* ctx, int cap);
+
+// Sets how sharp path corners are drawn.
+// Can be one of NVG_MITER (default), NVG_ROUND, NVG_BEVEL.
+void nvgLineJoin(struct NVGcontext* ctx, int join);
+
+//
+// Transforms
+//
+// The paths, gradients, patterns and scissor region are transformed by an transformation
+// matrix at the time when they are passed to the API.
+// The current transformation matrix is a affine matrix:
+// [sx kx tx]
+// [ky sy ty]
+// [ 0 0 1]
+// Where: sx,sy define scaling, kx,ky skewing, and tx,ty translation.
+// The last row is assumed to be 0,0,1 and is not stored.
+//
+// Apart from nvgResetTransform(), each transformation function first creates
+// specific transformation matrix and pre-multiplies the current transformation by it.
+//
+// Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore().
+
+// Resets current transform to a identity matrix.
+void nvgResetTransform(struct NVGcontext* ctx);
+
+// Premultiplies current coordinate system by specified matrix.
+// The parameters are interpreted as matrix as follows:
+// [a c e]
+// [b d f]
+// [0 0 1]
+void nvgTransform(struct NVGcontext* ctx, float a, float b, float c, float d, float e, float f);
+
+// Translates current coordinate system.
+void nvgTranslate(struct NVGcontext* ctx, float x, float y);
+
+// Rotates current coordinate system. Angle is specifid in radians.
+void nvgRotate(struct NVGcontext* ctx, float angle);
+
+// Skews the current coordinate system along X axis. Angle is specifid in radians.
+void nvgSkewX(struct NVGcontext* ctx, float angle);
+
+// Skews the current coordinate system along Y axis. Angle is specifid in radians.
+void nvgSkewY(struct NVGcontext* ctx, float angle);
+
+// Scales the current coordinat system.
+void nvgScale(struct NVGcontext* ctx, float x, float y);
+
+// Stores the top part (a-f) of the current transformation matrix in to the specified buffer.
+// [a c e]
+// [b d f]
+// [0 0 1]
+// There should be space for 6 floats in the return buffer for the values a-f.
+void nvgCurrentTransform(struct NVGcontext* ctx, float* xform);
+
+
+// The following functions can be used to make calculations on 2x3 transformation matrices.
+// A 2x3 matrix is representated as float[6].
+
+// Sets the transform to identity matrix.
+void nvgTransformIdentity(float* dst);
+
+// Sets the transform to translation matrix matrix.
+void nvgTransformTranslate(float* dst, float tx, float ty);
+
+// Sets the transform to scale matrix.
+void nvgTransformScale(float* dst, float sx, float sy);
+
+// Sets the transform to rotate matrix. Angle is specifid in radians.
+void nvgTransformRotate(float* dst, float a);
+
+// Sets the transform to skew-x matrix. Angle is specifid in radians.
+void nvgTransformSkewX(float* dst, float a);
+
+// Sets the transform to skew-y matrix. Angle is specifid in radians.
+void nvgTransformSkewY(float* dst, float a);
+
+// Sets the transform to the result of multiplication of two transforms, of A = A*B.
+void nvgTransformMultiply(float* dst, const float* src);
+
+// Sets the transform to the result of multiplication of two transforms, of A = B*A.
+void nvgTransformPremultiply(float* dst, const float* src);
+
+// Sets the destination to inverse of specified transform.
+// Returns 1 if the inverse could be calculated, else 0.
+int nvgTransformInverse(float* dst, const float* src);
+
+// Transform a point by given transform.
+void nvgTransformPoint(float* dstx, float* dsty, const float* xform, float srcx, float srcy);
+
+// Converts degress to radians and vice versa.
+float nvgDegToRad(float deg);
+float nvgRadToDeg(float rad);
+
+//
+// Images
+//
+// NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering.
+// In addition you can upload your own image. The image loading is provided by stb_image.
+
+// Creates image by loading it from the disk from specified file name.
+// Returns handle to the image.
+int nvgCreateImage(struct NVGcontext* ctx, const char* filename);
+
+// Creates image by loading it from the specified chunk of memory.
+// Returns handle to the image.
+int nvgCreateImageMem(struct NVGcontext* ctx, unsigned char* data, int ndata);
+
+// Creates image from specified image data.
+// Returns handle to the image.
+int nvgCreateImageRGBA(struct NVGcontext* ctx, int w, int h, const unsigned char* data);
+
+// Updates image data specified by image handle.
+void nvgUpdateImage(struct NVGcontext* ctx, int image, const unsigned char* data);
+
+// Returns the domensions of a created image.
+void nvgImageSize(struct NVGcontext* ctx, int image, int* w, int* h);
+
+// Deletes created image.
+void nvgDeleteImage(struct NVGcontext* ctx, int image);
+
+//
+// Paints
+//
+// NanoVG supports four types of paints: linear gradient, box gradient, radial gradient and image pattern.
+// These can be used as paints for strokes and fills.
+
+// Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates
+// of the linear gradient, icol specifies the start color and ocol the end color.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+struct NVGpaint nvgLinearGradient(struct NVGcontext* ctx, float sx, float sy, float ex, float ey,
+ struct NVGcolor icol, struct NVGcolor ocol);
+
+// Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering
+// drop shadows or hilights for boxes. Parameters (x,y) define the top-left corner of the rectangle,
+// (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry
+// the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+struct NVGpaint nvgBoxGradient(struct NVGcontext* ctx, float x, float y, float w, float h,
+ float r, float f, struct NVGcolor icol, struct NVGcolor ocol);
+
+// Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify
+// the inner and outer radius of the gradient, icol specifies the start color and ocol the end color.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+struct NVGpaint nvgRadialGradient(struct NVGcontext* ctx, float cx, float cy, float inr, float outr,
+ struct NVGcolor icol, struct NVGcolor ocol);
+
+// Creates and returns an image patter. Parameters (ox,oy) specify the left-top location of the image pattern,
+// (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render,
+// and repeat is combination of NVG_REPEATX and NVG_REPEATY which tells if the image should be repeated across x or y.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+struct NVGpaint nvgImagePattern(struct NVGcontext* ctx, float ox, float oy, float ex, float ey,
+ float angle, int image, int repeat);
+
+//
+// Scissoring
+//
+// Scissoring allows you to clip the rendering into a rectangle. This is useful for varius
+// user interface cases like rendering a text edit or a timeline.
+
+// Sets the current
+// The scissor rectangle is transformed by the current transform.
+void nvgScissor(struct NVGcontext* ctx, float x, float y, float w, float h);
+
+// Reset and disables scissoring.
+void nvgResetScissor(struct NVGcontext* ctx);
+
+//
+// Paths
+//
+// Drawing a new shape starts with nvgBeginPath(), it clears all the currently defined paths.
+// Then you define one or more paths and sub-paths which describe the shape. The are functions
+// to draw common shapes like rectangles and circles, and lower level step-by-step functions,
+// which allow to define a path curve by curve.
+//
+// NanoVG uses even-odd fill rule to draw the shapes. Solid shapes should have counter clockwise
+// winding and holes should have counter clockwise order. To specify winding of a path you can
+// call nvgPathWinding(). This is useful especially for the common shapes, which are drawn CCW.
+//
+// Finally you can fill the path using current fill style by calling nvgFill(), and stroke it
+// with current stroke style by calling nvgStroke().
+//
+// The curve segments and sub-paths are transformed by the current transform.
+
+// Clears the current path and sub-paths.
+void nvgBeginPath(struct NVGcontext* ctx);
+
+// Starts new sub-path with specified point as first point.
+void nvgMoveTo(struct NVGcontext* ctx, float x, float y);
+
+// Adds line segment from the last point in the path to the specified point.
+void nvgLineTo(struct NVGcontext* ctx, float x, float y);
+
+// Adds bezier segment from last point in the path via two control points to the specified point.
+void nvgBezierTo(struct NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y);
+
+// Adds an arc segment at the corner defined by the last path point, and two specified points.
+void nvgArcTo(struct NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius);
+
+// Closes current sub-path with a line segment.
+void nvgClosePath(struct NVGcontext* ctx);
+
+// Sets the current sub-path winding, see NVGwinding and NVGsolidity.
+void nvgPathWinding(struct NVGcontext* ctx, int dir);
+
+// Creates new arc shaped sub-path.
+void nvgArc(struct NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir);
+
+// Creates new rectangle shaped sub-path.
+void nvgRect(struct NVGcontext* ctx, float x, float y, float w, float h);
+
+// Creates new rounded rectangle shaped sub-path.
+void nvgRoundedRect(struct NVGcontext* ctx, float x, float y, float w, float h, float r);
+
+// Creates new ellipse shaped sub-path.
+void nvgEllipse(struct NVGcontext* ctx, float cx, float cy, float rx, float ry);
+
+// Creates new circle shaped sub-path.
+void nvgCircle(struct NVGcontext* ctx, float cx, float cy, float r);
+
+// Fills the current path with current fill style.
+void nvgFill(struct NVGcontext* ctx);
+
+// Fills the current path with current stroke style.
+void nvgStroke(struct NVGcontext* ctx);
+
+
+//
+// Text
+//
+// NanoVG allows you to load .ttf files and use the font to render text.
+//
+// The appearance of the text can be defined by setting the current text style
+// and by specifying the fill color. Common text and font settings such as
+// font size, letter spacing and text align are supported. Font blur allows you
+// to create simple text effects such as drop shadows.
+//
+// At render time the font face can be set based on the font handles or name.
+//
+// Font measure functions return values in local space, the calculations are
+// carried in the same resolution as the final rendering. This is done because
+// the text glyph positions are snapped to the nearest pixels sharp rendering.
+//
+// The local space means that values are not rotated or scale as per the current
+// transformation. For example if you set font size to 12, which would mean that
+// line height is 16, then regardless of the current scaling and rotation, the
+// returned line height is always 16. Some measures may vary because of the scaling
+// since aforementioned pixel snapping.
+//
+// While this may sound a little odd, the setup allows you to always render the
+// same way regardless of scaling. I.e. following works regardless of scaling:
+//
+// const char* txt = "Text me up.";
+// nvgTextBounds(vg, x,y, txt, NULL, bounds);
+// nvgBeginPath(vg);
+// nvgRoundedRect(vg, bounds[0],bounds[1], bounds[2]-bounds[0], bounds[3]-bounds[1]);
+// nvgFill(vg);
+//
+// Note: currently only solid color fill is supported for text.
+
+// Creates font by loading it from the disk from specified file name.
+// Returns handle to the font.
+int nvgCreateFont(struct NVGcontext* ctx, const char* name, const char* filename);
+
+// Creates image by loading it from the specified memory chunk.
+// Returns handle to the font.
+int nvgCreateFontMem(struct NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData);
+
+// Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found.
+int nvgFindFont(struct NVGcontext* ctx, const char* name);
+
+// Sets the font size of current text style.
+void nvgFontSize(struct NVGcontext* ctx, float size);
+
+// Sets the blur of current text style.
+void nvgFontBlur(struct NVGcontext* ctx, float blur);
+
+// Sets the letter spacing of current text style.
+void nvgTextLetterSpacing(struct NVGcontext* ctx, float spacing);
+
+// Sets the proportional line height of current text style. The line height is specified as multiple of font size.
+void nvgTextLineHeight(struct NVGcontext* ctx, float lineHeight);
+
+// Sets the text align of current text style, see NVGaling for options.
+void nvgTextAlign(struct NVGcontext* ctx, int align);
+
+// Sets the font face based on specified id of current text style.
+void nvgFontFaceId(struct NVGcontext* ctx, int font);
+
+// Sets the font face based on specified name of current text style.
+void nvgFontFace(struct NVGcontext* ctx, const char* font);
+
+// Draws text string at specified location. If end is specified only the sub-string up to the end is drawn.
+float nvgText(struct NVGcontext* ctx, float x, float y, const char* string, const char* end);
+
+// Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn.
+// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+// Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+void nvgTextBox(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end);
+
+// Measures the specified text string. Parameter bounds should be a pointer to float[4],
+// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+// Returns the horizontal advance of the measured text (i.e. where the next character should drawn).
+// Measured values are returned in local coordinate space.
+float nvgTextBounds(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds);
+
+// Measures the specified multi-text string. Parameter bounds should be a pointer to float[4],
+// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+// Measured values are returned in local coordinate space.
+void nvgTextBoxBounds(struct NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds);
+
+// Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used.
+// Measured values are returned in local coordinate space.
+int nvgTextGlyphPositions(struct NVGcontext* ctx, float x, float y, const char* string, const char* end, struct NVGglyphPosition* positions, int maxPositions);
+
+// Returns the vertical metrics based on the current text style.
+// Measured values are returned in local coordinate space.
+void nvgTextMetrics(struct NVGcontext* ctx, float* ascender, float* descender, float* lineh);
+
+// Breaks the specified text into lines. If end is specified only the sub-string will be used.
+// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+// Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+int nvgTextBreakLines(struct NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, struct NVGtextRow* rows, int maxRows);
+
+//
+// Internal Render API
+//
+enum NVGtexture {
+ NVG_TEXTURE_ALPHA = 0x01,
+ NVG_TEXTURE_RGBA = 0x02,
+};
+
+struct NVGscissor
+{
+ float xform[6];
+ float extent[2];
+};
+
+struct NVGvertex {
+ float x,y,u,v;
+};
+
+struct NVGpath {
+ int first;
+ int count;
+ unsigned char closed;
+ int nbevel;
+ struct NVGvertex* fill;
+ int nfill;
+ struct NVGvertex* stroke;
+ int nstroke;
+ int winding;
+ int convex;
+};
+
+struct NVGparams {
+ void* userPtr;
+ int atlasWidth, atlasHeight;
+ int edgeAntiAlias;
+ int (*renderCreate)(void* uptr);
+ int (*renderCreateTexture)(void* uptr, int type, int w, int h, const unsigned char* data);
+ int (*renderDeleteTexture)(void* uptr, int image);
+ int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data);
+ int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h);
+ void (*renderViewport)(void* uptr, int width, int height, int alphaBlend);
+ void (*renderFlush)(void* uptr, int alphaBlend);
+ void (*renderFill)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe, const float* bounds, const struct NVGpath* paths, int npaths);
+ void (*renderStroke)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe, float strokeWidth, const struct NVGpath* paths, int npaths);
+ void (*renderTriangles)(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, const struct NVGvertex* verts, int nverts);
+ void (*renderDelete)(void* uptr);
+};
+
+// Contructor and destructor, called by the render back-end.
+struct NVGcontext* nvgCreateInternal(struct NVGparams* params);
+void nvgDeleteInternal(struct NVGcontext* ctx);
+
+// Debug function to dump cached path data.
+void nvgDebugDumpPathCache(struct NVGcontext* ctx);
+
+#define NVG_NOTUSED(v) do { (void)(1 ? (void)0 : ( (void)(v) ) ); } while(0)
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NANOVG_H
diff --git a/dgl/src/nanovg/nanovg_gl.h b/dgl/src/nanovg/nanovg_gl.h
@@ -0,0 +1,1311 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty. In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+// claim that you wrote the original software. If you use this software
+// in a product, an acknowledgment in the product documentation would be
+// appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+// misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+#ifndef NANOVG_GL3_H
+#define NANOVG_GL3_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NVG_ANTIALIAS 1
+
+#if defined NANOVG_GL2_IMPLEMENTATION
+# define NANOVG_GL2 1
+# define NANOVG_GL_IMPLEMENTATION 1
+#elif defined NANOVG_GL3_IMPLEMENTATION
+# define NANOVG_GL3 1
+# define NANOVG_GL_IMPLEMENTATION 1
+# define NANOVG_GL_USE_UNIFORMBUFFER 1
+#elif defined NANOVG_GLES2_IMPLEMENTATION
+# define NANOVG_GLES2 1
+# define NANOVG_GL_IMPLEMENTATION 1
+#elif defined NANOVG_GLES3_IMPLEMENTATION
+# define NANOVG_GLES3 1
+# define NANOVG_GL_IMPLEMENTATION 1
+#endif
+
+
+#if defined NANOVG_GL2
+
+struct NVGcontext* nvgCreateGL2(int atlasw, int atlash, int edgeaa);
+void nvgDeleteGL2(struct NVGcontext* ctx);
+
+#elif defined NANOVG_GL3
+
+struct NVGcontext* nvgCreateGL3(int atlasw, int atlash, int edgeaa);
+void nvgDeleteGL3(struct NVGcontext* ctx);
+
+#elif defined NANOVG_GLES2
+
+struct NVGcontext* nvgCreateGLES2(int atlasw, int atlash, int edgeaa);
+void nvgDeleteGLES2(struct NVGcontext* ctx);
+
+#elif defined NANOVG_GLES3
+
+struct NVGcontext* nvgCreateGLES3(int atlasw, int atlash, int edgeaa);
+void nvgDeleteGLES3(struct NVGcontext* ctx);
+
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
+
+#ifdef NANOVG_GL_IMPLEMENTATION
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include "nanovg.h"
+
+enum GLNVGuniformLoc {
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ GLNVG_LOC_VIEW,
+ GLNVG_LOC_FRAG,
+#else
+ GLNVG_LOC_VIEWSIZE,
+ GLNVG_LOC_SCISSORMAT,
+ GLNVG_LOC_SCISSOREXT,
+ GLNVG_LOC_SCISSORSCALE,
+ GLNVG_LOC_PAINTMAT,
+ GLNVG_LOC_EXTENT,
+ GLNVG_LOC_RADIUS,
+ GLNVG_LOC_FEATHER,
+ GLNVG_LOC_INNERCOL,
+ GLNVG_LOC_OUTERCOL,
+ GLNVG_LOC_STROKEMULT,
+ GLNVG_LOC_TEX,
+ GLNVG_LOC_TEXTYPE,
+ GLNVG_LOC_TYPE,
+#endif
+ GLNVG_MAX_LOCS
+};
+
+enum GLNVGshaderType {
+ NSVG_SHADER_FILLGRAD,
+ NSVG_SHADER_FILLIMG,
+ NSVG_SHADER_SIMPLE,
+ NSVG_SHADER_IMG
+};
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+enum GLNVGuniformBindings {
+ GLNVG_VIEW_BINDING = 0,
+ GLNVG_FRAG_BINDING = 1,
+};
+#endif
+
+struct GLNVGshader {
+ GLuint prog;
+ GLuint frag;
+ GLuint vert;
+ GLint loc[GLNVG_MAX_LOCS];
+};
+
+struct GLNVGtexture {
+ int id;
+ GLuint tex;
+ int width, height;
+ int type;
+};
+
+enum GLNVGcallType {
+ GLNVG_NONE = 0,
+ GLNVG_FILL,
+ GLNVG_CONVEXFILL,
+ GLNVG_STROKE,
+ GLNVG_TRIANGLES,
+};
+
+struct GLNVGcall {
+ int type;
+ int image;
+ int pathOffset;
+ int pathCount;
+ int triangleOffset;
+ int triangleCount;
+ int uniformOffset;
+};
+
+struct GLNVGpath {
+ int fillOffset;
+ int fillCount;
+ int strokeOffset;
+ int strokeCount;
+};
+
+struct GLNVGfragUniforms {
+ float scissorMat[12]; // matrices are actually 3 vec4s
+ float paintMat[12];
+ struct NVGcolor innerCol;
+ struct NVGcolor outerCol;
+ float scissorExt[2];
+ float scissorScale[2];
+ float extent[2];
+ float radius;
+ float feather;
+ float strokeMult;
+ int texType;
+ int type;
+};
+
+struct GLNVGcontext {
+ struct GLNVGshader shader;
+ struct GLNVGtexture* textures;
+ float view[2];
+ int ntextures;
+ int ctextures;
+ int textureId;
+ GLuint vertBuf;
+#if defined NANOVG_GL3
+ GLuint vertArr;
+#endif
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ GLuint viewBuf;
+ GLuint fragBuf;
+#endif
+ int fragSize;
+ int edgeAntiAlias;
+
+ // Per frame buffers
+ struct GLNVGcall* calls;
+ int ccalls;
+ int ncalls;
+ struct GLNVGpath* paths;
+ int cpaths;
+ int npaths;
+ struct NVGvertex* verts;
+ int cverts;
+ int nverts;
+ unsigned char* uniforms;
+ int cuniforms;
+ int nuniforms;
+};
+
+static int glnvg__maxi(int a, int b) { return a > b ? a : b; }
+
+static struct GLNVGtexture* glnvg__allocTexture(struct GLNVGcontext* gl)
+{
+ struct GLNVGtexture* tex = NULL;
+ int i;
+
+ for (i = 0; i < gl->ntextures; i++) {
+ if (gl->textures[i].id == 0) {
+ tex = &gl->textures[i];
+ break;
+ }
+ }
+ if (tex == NULL) {
+ if (gl->ntextures+1 > gl->ctextures) {
+ struct GLNVGtexture* textures;
+ int ctextures = glnvg__maxi(gl->ntextures+1, 4) + gl->ctextures/2; // 1.5x Overallocate
+ textures = (struct GLNVGtexture*)realloc(gl->textures, sizeof(struct GLNVGtexture)*ctextures);
+ if (textures == NULL) return NULL;
+ gl->textures = textures;
+ gl->ctextures = ctextures;
+ }
+ tex = &gl->textures[gl->ntextures++];
+ }
+
+ memset(tex, 0, sizeof(*tex));
+ tex->id = ++gl->textureId;
+
+ return tex;
+}
+
+static struct GLNVGtexture* glnvg__findTexture(struct GLNVGcontext* gl, int id)
+{
+ int i;
+ for (i = 0; i < gl->ntextures; i++)
+ if (gl->textures[i].id == id)
+ return &gl->textures[i];
+ return NULL;
+}
+
+static int glnvg__deleteTexture(struct GLNVGcontext* gl, int id)
+{
+ int i;
+ for (i = 0; i < gl->ntextures; i++) {
+ if (gl->textures[i].id == id) {
+ if (gl->textures[i].tex != 0)
+ glDeleteTextures(1, &gl->textures[i].tex);
+ memset(&gl->textures[i], 0, sizeof(gl->textures[i]));
+ return 1;
+ }
+ }
+ return 0;
+}
+
+static void glnvg__dumpShaderError(GLuint shader, const char* name, const char* type)
+{
+ char str[512+1];
+ int len = 0;
+ glGetShaderInfoLog(shader, 512, &len, str);
+ if (len > 512) len = 512;
+ str[len] = '\0';
+ printf("Shader %s/%s error:\n%s\n", name, type, str);
+}
+
+static void glnvg__dumpProgramError(GLuint prog, const char* name)
+{
+ char str[512+1];
+ int len = 0;
+ glGetProgramInfoLog(prog, 512, &len, str);
+ if (len > 512) len = 512;
+ str[len] = '\0';
+ printf("Program %s error:\n%s\n", name, str);
+}
+
+static int glnvg__checkError(const char* str)
+{
+ GLenum err = glGetError();
+ if (err != GL_NO_ERROR) {
+ printf("Error %08x after %s\n", err, str);
+ return 1;
+ }
+ return 0;
+}
+
+static int glnvg__createShader(struct GLNVGshader* shader, const char* name, const char* header, const char* opts, const char* vshader, const char* fshader)
+{
+ GLint status;
+ GLuint prog, vert, frag;
+ const char* str[3];
+ str[0] = header;
+ str[1] = opts != NULL ? opts : "";
+
+ memset(shader, 0, sizeof(*shader));
+
+ prog = glCreateProgram();
+ vert = glCreateShader(GL_VERTEX_SHADER);
+ frag = glCreateShader(GL_FRAGMENT_SHADER);
+ str[2] = vshader;
+ glShaderSource(vert, 3, str, 0);
+ str[2] = fshader;
+ glShaderSource(frag, 3, str, 0);
+
+ glCompileShader(vert);
+ glGetShaderiv(vert, GL_COMPILE_STATUS, &status);
+ if (status != GL_TRUE) {
+ glnvg__dumpShaderError(vert, name, "vert");
+ return 0;
+ }
+
+ glCompileShader(frag);
+ glGetShaderiv(frag, GL_COMPILE_STATUS, &status);
+ if (status != GL_TRUE) {
+ glnvg__dumpShaderError(frag, name, "frag");
+ return 0;
+ }
+
+ glAttachShader(prog, vert);
+ glAttachShader(prog, frag);
+
+ glBindAttribLocation(prog, 0, "vertex");
+ glBindAttribLocation(prog, 1, "tcoord");
+
+ glLinkProgram(prog);
+ glGetProgramiv(prog, GL_LINK_STATUS, &status);
+ if (status != GL_TRUE) {
+ glnvg__dumpProgramError(prog, name);
+ return 0;
+ }
+
+ shader->prog = prog;
+ shader->vert = vert;
+ shader->frag = frag;
+
+ return 1;
+}
+
+static void glnvg__deleteShader(struct GLNVGshader* shader)
+{
+ if (shader->prog != 0)
+ glDeleteProgram(shader->prog);
+ if (shader->vert != 0)
+ glDeleteShader(shader->vert);
+ if (shader->frag != 0)
+ glDeleteShader(shader->frag);
+}
+
+static void glnvg__getUniforms(struct GLNVGshader* shader)
+{
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ shader->loc[GLNVG_LOC_VIEW] = glGetUniformBlockIndex(shader->prog, "view");
+ shader->loc[GLNVG_LOC_FRAG] = glGetUniformBlockIndex(shader->prog, "frag");
+#else
+ shader->loc[GLNVG_LOC_VIEWSIZE] = glGetUniformLocation(shader->prog, "viewSize");
+ shader->loc[GLNVG_LOC_SCISSORMAT] = glGetUniformLocation(shader->prog, "scissorMat");
+ shader->loc[GLNVG_LOC_SCISSOREXT] = glGetUniformLocation(shader->prog, "scissorExt");
+ shader->loc[GLNVG_LOC_SCISSORSCALE] = glGetUniformLocation(shader->prog, "scissorScale");
+ shader->loc[GLNVG_LOC_PAINTMAT] = glGetUniformLocation(shader->prog, "paintMat");
+ shader->loc[GLNVG_LOC_EXTENT] = glGetUniformLocation(shader->prog, "extent");
+ shader->loc[GLNVG_LOC_RADIUS] = glGetUniformLocation(shader->prog, "radius");
+ shader->loc[GLNVG_LOC_FEATHER] = glGetUniformLocation(shader->prog, "feather");
+ shader->loc[GLNVG_LOC_INNERCOL] = glGetUniformLocation(shader->prog, "innerCol");
+ shader->loc[GLNVG_LOC_OUTERCOL] = glGetUniformLocation(shader->prog, "outerCol");
+ shader->loc[GLNVG_LOC_STROKEMULT] = glGetUniformLocation(shader->prog, "strokeMult");
+ shader->loc[GLNVG_LOC_TEX] = glGetUniformLocation(shader->prog, "tex");
+ shader->loc[GLNVG_LOC_TEXTYPE] = glGetUniformLocation(shader->prog, "texType");
+ shader->loc[GLNVG_LOC_TYPE] = glGetUniformLocation(shader->prog, "type");
+#endif
+}
+
+static int glnvg__renderCreate(void* uptr)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ int align = 4;
+
+ // TODO: mediump float may not be enough for GLES2 in iOS.
+ // see the following discussion: https://github.com/memononen/nanovg/issues/46
+ static const char* shaderHeader =
+#if defined NANOVG_GL2
+ "#define NANOVG_GL2 1\n";
+#elif defined NANOVG_GL3
+ "#version 150 core\n"
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ "#define USE_UNIFORMBUFFER 1\n"
+#endif
+ "#define NANOVG_GL3 1\n";
+#elif defined NANOVG_GLES2
+ "#version 100\n"
+ "precision mediump float;\n"
+ "#define NANOVG_GL2 1\n";
+#elif defined NANOVG_GLES3
+ "#version 300 es\n"
+ "precision mediump float;\n"
+ "#define NANOVG_GL3 1\n";
+#endif
+
+ static const char* fillVertShader =
+ "#ifdef NANOVG_GL3\n"
+ "#ifdef USE_UNIFORMBUFFER\n"
+ " layout(std140) uniform view {\n"
+ " vec2 viewSize;\n"
+ " };\n"
+ "#else\n"
+ " uniform vec2 viewSize;\n"
+ "#endif\n"
+ " in vec2 vertex;\n"
+ " in vec2 tcoord;\n"
+ " out vec2 ftcoord;\n"
+ " out vec2 fpos;\n"
+ "#else\n"
+ " uniform vec2 viewSize;\n"
+ " attribute vec2 vertex;\n"
+ " attribute vec2 tcoord;\n"
+ " varying vec2 ftcoord;\n"
+ " varying vec2 fpos;\n"
+ "#endif\n"
+ "void main(void) {\n"
+ " ftcoord = tcoord;\n"
+ " fpos = vertex;\n"
+ " gl_Position = vec4(2.0*vertex.x/viewSize.x - 1.0, 1.0 - 2.0*vertex.y/viewSize.y, 0, 1);\n"
+ "}\n";
+
+ static const char* fillFragShader =
+ "#ifdef NANOVG_GL3\n"
+ "#ifdef USE_UNIFORMBUFFER\n"
+ " layout(std140) uniform frag {\n"
+ " mat3 scissorMat;\n"
+ " mat3 paintMat;\n"
+ " vec4 innerCol;\n"
+ " vec4 outerCol;\n"
+ " vec2 scissorExt;\n"
+ " vec2 scissorScale;\n"
+ " vec2 extent;\n"
+ " float radius;\n"
+ " float feather;\n"
+ " float strokeMult;\n"
+ " int texType;\n"
+ " int type;\n"
+ " };\n"
+ "#else\n"
+ " uniform mat3 scissorMat;\n"
+ " uniform mat3 paintMat;\n"
+ " uniform vec4 innerCol;\n"
+ " uniform vec4 outerCol;\n"
+ " uniform vec2 scissorExt;\n"
+ " uniform vec2 scissorScale;\n"
+ " uniform vec2 extent;\n"
+ " uniform float radius;\n"
+ " uniform float feather;\n"
+ " uniform float strokeMult;\n"
+ " uniform int texType;\n"
+ " uniform int type;\n"
+ "#endif\n"
+ " uniform sampler2D tex;\n"
+ " in vec2 ftcoord;\n"
+ " in vec2 fpos;\n"
+ " out vec4 outColor;\n"
+ "#else\n"
+ " uniform mat3 scissorMat;\n"
+ " uniform mat3 paintMat;\n"
+ " uniform vec4 innerCol;\n"
+ " uniform vec4 outerCol;\n"
+ " uniform vec2 scissorExt;\n"
+ " uniform vec2 scissorScale;\n"
+ " uniform vec2 extent;\n"
+ " uniform float radius;\n"
+ " uniform float feather;\n"
+ " uniform float strokeMult;\n"
+ " uniform int texType;\n"
+ " uniform int type;\n"
+ " uniform sampler2D tex;\n"
+ " varying vec2 ftcoord;\n"
+ " varying vec2 fpos;\n"
+ "#endif\n"
+ "\n"
+ "float sdroundrect(vec2 pt, vec2 ext, float rad) {\n"
+ " vec2 ext2 = ext - vec2(rad,rad);\n"
+ " vec2 d = abs(pt) - ext2;\n"
+ " return min(max(d.x,d.y),0.0) + length(max(d,0.0)) - rad;\n"
+ "}\n"
+ "\n"
+ "// Scissoring\n"
+ "float scissorMask(vec2 p) {\n"
+ " vec2 sc = (abs((scissorMat * vec3(p,1.0)).xy) - scissorExt);\n"
+ " sc = vec2(0.5,0.5) - sc * scissorScale;\n"
+ " return clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);\n"
+ "}\n"
+ "#ifdef EDGE_AA\n"
+ "// Stroke - from [0..1] to clipped pyramid, where the slope is 1px.\n"
+ "float strokeMask() {\n"
+ " return min(1.0, (1.0-abs(ftcoord.x*2.0-1.0))*strokeMult) * min(1.0, ftcoord.y);\n"
+ "}\n"
+ "#endif\n"
+ "\n"
+ "void main(void) {\n"
+ " vec4 result;\n"
+ " float scissor = scissorMask(fpos);\n"
+ "#ifdef EDGE_AA\n"
+ " float strokeAlpha = strokeMask();\n"
+ "#else\n"
+ " float strokeAlpha = 1.0;\n"
+ "#endif\n"
+ " if (type == 0) { // Gradient\n"
+ " // Calculate gradient color using box gradient\n"
+ " vec2 pt = (paintMat * vec3(fpos,1.0)).xy;\n"
+ " float d = clamp((sdroundrect(pt, extent, radius) + feather*0.5) / feather, 0.0, 1.0);\n"
+ " vec4 color = mix(innerCol,outerCol,d);\n"
+ " // Combine alpha\n"
+ " color.w *= strokeAlpha * scissor;\n"
+ " result = color;\n"
+ " } else if (type == 1) { // Image\n"
+ " // Calculate color fron texture\n"
+ " vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;\n"
+ "#ifdef NANOVG_GL3\n"
+ " vec4 color = texture(tex, pt);\n"
+ "#else\n"
+ " vec4 color = texture2D(tex, pt);\n"
+ "#endif\n"
+ " color = texType == 0 ? color : vec4(1,1,1,color.x);\n"
+ " // Combine alpha\n"
+ " color.w *= strokeAlpha * scissor;\n"
+ " result = color;\n"
+ " } else if (type == 2) { // Stencil fill\n"
+ " result = vec4(1,1,1,1);\n"
+ " } else if (type == 3) { // Textured tris\n"
+ "#ifdef NANOVG_GL3\n"
+ " vec4 color = texture(tex, ftcoord);\n"
+ "#else\n"
+ " vec4 color = texture2D(tex, ftcoord);\n"
+ "#endif\n"
+ " color = texType == 0 ? color : vec4(1,1,1,color.x);\n"
+ " color.w *= scissor;\n"
+ " result = color * innerCol;\n"
+ " }\n"
+ "#ifdef NANOVG_GL3\n"
+ " outColor = result;\n"
+ "#else\n"
+ " gl_FragColor = result;\n"
+ "#endif\n"
+ "}\n";
+
+ glnvg__checkError("init");
+
+ if (gl->edgeAntiAlias) {
+ if (glnvg__createShader(&gl->shader, "shader", shaderHeader, "#define EDGE_AA 1\n", fillVertShader, fillFragShader) == 0)
+ return 0;
+ } else {
+ if (glnvg__createShader(&gl->shader, "shader", shaderHeader, NULL, fillVertShader, fillFragShader) == 0)
+ return 0;
+ }
+
+ glnvg__checkError("uniform locations");
+ glnvg__getUniforms(&gl->shader);
+
+ // Create dynamic vertex array
+#if defined NANOVG_GL3
+ glGenVertexArrays(1, &gl->vertArr);
+#endif
+ glGenBuffers(1, &gl->vertBuf);
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ // Create UBOs
+ glUniformBlockBinding(gl->shader.prog, gl->shader.loc[GLNVG_LOC_VIEW], GLNVG_VIEW_BINDING);
+ glGenBuffers(1, &gl->viewBuf);
+ glUniformBlockBinding(gl->shader.prog, gl->shader.loc[GLNVG_LOC_FRAG], GLNVG_FRAG_BINDING);
+ glGenBuffers(1, &gl->fragBuf);
+ glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &align);
+#endif
+ gl->fragSize = sizeof(struct GLNVGfragUniforms) + align - sizeof(struct GLNVGfragUniforms) % align;
+
+ glnvg__checkError("create done");
+
+ glFinish();
+
+ return 1;
+}
+
+static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, const unsigned char* data)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ struct GLNVGtexture* tex = glnvg__allocTexture(gl);
+
+ if (tex == NULL) return 0;
+
+ glGenTextures(1, &tex->tex);
+ tex->width = w;
+ tex->height = h;
+ tex->type = type;
+ glBindTexture(GL_TEXTURE_2D, tex->tex);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT,1);
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+ if (type == NVG_TEXTURE_RGBA)
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+ else
+#if defined(NANOVG_GLES2)
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, w, h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+#elif defined(NANOVG_GLES3)
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data);
+#else
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data);
+#endif
+
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+ if (glnvg__checkError("create tex"))
+ return 0;
+
+ glBindTexture(GL_TEXTURE_2D, 0);
+
+ return tex->id;
+}
+
+
+static int glnvg__renderDeleteTexture(void* uptr, int image)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ return glnvg__deleteTexture(gl, image);
+}
+
+static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ struct GLNVGtexture* tex = glnvg__findTexture(gl, image);
+
+ if (tex == NULL) return 0;
+ glBindTexture(GL_TEXTURE_2D, tex->tex);
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT,1);
+
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, x);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, y);
+#else
+ // No support for all of skip, need to update a whole row at a time.
+ if (tex->type == NVG_TEXTURE_RGBA)
+ data += y*tex->width*4;
+ else
+ data += y*tex->width;
+ x = 0;
+ w = tex->width;
+#endif
+
+ if (tex->type == NVG_TEXTURE_RGBA)
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data);
+ else
+#ifdef NANOVG_GLES2
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+#else
+ glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RED, GL_UNSIGNED_BYTE, data);
+#endif
+
+ glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+#ifndef NANOVG_GLES2
+ glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+ glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+ glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+ glBindTexture(GL_TEXTURE_2D, 0);
+
+ return 1;
+}
+
+static int glnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ struct GLNVGtexture* tex = glnvg__findTexture(gl, image);
+ if (tex == NULL) return 0;
+ *w = tex->width;
+ *h = tex->height;
+ return 1;
+}
+
+static void glnvg__xformToMat3x4(float* m3, float* t)
+{
+ m3[0] = t[0];
+ m3[1] = t[1];
+ m3[2] = 0.0f;
+ m3[3] = 0.0f;
+ m3[4] = t[2];
+ m3[5] = t[3];
+ m3[6] = 0.0f;
+ m3[7] = 0.0f;
+ m3[8] = t[4];
+ m3[9] = t[5];
+ m3[10] = 1.0f;
+ m3[11] = 0.0f;
+}
+
+static int glnvg__convertPaint(struct GLNVGcontext* gl, struct GLNVGfragUniforms* frag, struct NVGpaint* paint,
+ struct NVGscissor* scissor, float width, float fringe)
+{
+ struct GLNVGtexture* tex = NULL;
+ float invxform[6];
+
+ memset(frag, 0, sizeof(*frag));
+
+ frag->innerCol = paint->innerColor;
+ frag->outerCol = paint->outerColor;
+
+ nvgTransformInverse(invxform, paint->xform);
+ glnvg__xformToMat3x4(frag->paintMat, invxform);
+
+ if (scissor->extent[0] < 0.5f || scissor->extent[1] < 0.5f) {
+ memset(frag->scissorMat, 0, sizeof(frag->scissorMat));
+ frag->scissorExt[0] = 1.0f;
+ frag->scissorExt[1] = 1.0f;
+ frag->scissorScale[0] = 1.0f;
+ frag->scissorScale[1] = 1.0f;
+ } else {
+ nvgTransformInverse(invxform, scissor->xform);
+ glnvg__xformToMat3x4(frag->scissorMat, invxform);
+ frag->scissorExt[0] = scissor->extent[0];
+ frag->scissorExt[1] = scissor->extent[1];
+ frag->scissorScale[0] = sqrtf(scissor->xform[0]*scissor->xform[0] + scissor->xform[2]*scissor->xform[2]) / fringe;
+ frag->scissorScale[1] = sqrtf(scissor->xform[1]*scissor->xform[1] + scissor->xform[3]*scissor->xform[3]) / fringe;
+ }
+ memcpy(frag->extent, paint->extent, sizeof(frag->extent));
+ frag->strokeMult = (width*0.5f + fringe*0.5f) / fringe;
+
+ if (paint->image != 0) {
+ tex = glnvg__findTexture(gl, paint->image);
+ if (tex == NULL) return 0;
+ frag->type = NSVG_SHADER_FILLIMG;
+ frag->texType = tex->type == NVG_TEXTURE_RGBA ? 0 : 1;
+ } else {
+ frag->type = NSVG_SHADER_FILLGRAD;
+ frag->radius = paint->radius;
+ frag->feather = paint->feather;
+ }
+ return 1;
+}
+
+static struct GLNVGfragUniforms* nvg__fragUniformPtr(struct GLNVGcontext* gl, int i);
+
+#if !NANOVG_GL_USE_UNIFORMBUFFER
+static void glnvg__mat3(float* dst, float* src)
+{
+ dst[0] = src[0];
+ dst[1] = src[1];
+ dst[2] = src[2];
+
+ dst[3] = src[4];
+ dst[4] = src[5];
+ dst[5] = src[6];
+
+ dst[6] = src[8];
+ dst[7] = src[9];
+ dst[8] = src[10];
+}
+#endif
+
+static void glnvg__setUniforms(struct GLNVGcontext* gl, int uniformOffset, int image)
+{
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ glBindBufferRange(GL_UNIFORM_BUFFER, GLNVG_FRAG_BINDING, gl->fragBuf, uniformOffset, sizeof(struct GLNVGfragUniforms));
+#else
+ struct GLNVGfragUniforms* frag = nvg__fragUniformPtr(gl, uniformOffset);
+ float tmp[9]; // Maybe there's a way to get rid of this...
+ glnvg__mat3(tmp, frag->scissorMat);
+ glUniformMatrix3fv(gl->shader.loc[GLNVG_LOC_SCISSORMAT], 1, GL_FALSE, tmp);
+ glnvg__mat3(tmp, frag->paintMat);
+ glUniformMatrix3fv(gl->shader.loc[GLNVG_LOC_PAINTMAT], 1, GL_FALSE, tmp);
+ glUniform4fv(gl->shader.loc[GLNVG_LOC_INNERCOL], 1, frag->innerCol.rgba);
+ glUniform4fv(gl->shader.loc[GLNVG_LOC_OUTERCOL], 1, frag->outerCol.rgba);
+ glUniform2fv(gl->shader.loc[GLNVG_LOC_SCISSOREXT], 1, frag->scissorExt);
+ glUniform2fv(gl->shader.loc[GLNVG_LOC_SCISSORSCALE], 1, frag->scissorScale);
+ glUniform2fv(gl->shader.loc[GLNVG_LOC_EXTENT], 1, frag->extent);
+ glUniform1f(gl->shader.loc[GLNVG_LOC_RADIUS], frag->radius);
+ glUniform1f(gl->shader.loc[GLNVG_LOC_FEATHER], frag->feather);
+ glUniform1f(gl->shader.loc[GLNVG_LOC_STROKEMULT], frag->strokeMult);
+ glUniform1i(gl->shader.loc[GLNVG_LOC_TEXTYPE], frag->texType);
+ glUniform1i(gl->shader.loc[GLNVG_LOC_TYPE], frag->type);
+#endif
+
+ if (image != 0) {
+ struct GLNVGtexture* tex = glnvg__findTexture(gl, image);
+ glBindTexture(GL_TEXTURE_2D, tex != NULL ? tex->tex : 0);
+ glnvg__checkError("tex paint tex");
+ } else {
+ glBindTexture(GL_TEXTURE_2D, 0);
+ }
+}
+
+static void glnvg__renderViewport(void* uptr, int width, int height, int alphaBlend)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ NVG_NOTUSED(alphaBlend);
+ gl->view[0] = (float)width;
+ gl->view[1] = (float)height;
+}
+
+static void glnvg__fill(struct GLNVGcontext* gl, struct GLNVGcall* call)
+{
+ struct GLNVGpath* paths = &gl->paths[call->pathOffset];
+ int i, npaths = call->pathCount;
+
+ // Draw shapes
+ glEnable(GL_STENCIL_TEST);
+ glStencilMask(0xff);
+ glStencilFunc(GL_ALWAYS, 0, ~0L);
+ glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+
+ // set bindpoint for solid loc
+ glnvg__setUniforms(gl, call->uniformOffset, 0);
+ glnvg__checkError("fill simple");
+
+ glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
+ glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP);
+ glDisable(GL_CULL_FACE);
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount);
+ glEnable(GL_CULL_FACE);
+
+ // Draw aliased off-pixels
+ glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+ glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image);
+ glnvg__checkError("fill fill");
+
+ if (gl->edgeAntiAlias) {
+ glStencilFunc(GL_EQUAL, 0x00, 0xff);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+ // Draw fringes
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+ }
+
+ // Draw fill
+ glStencilFunc(GL_NOTEQUAL, 0x0, 0xff);
+ glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
+ glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount);
+
+ glDisable(GL_STENCIL_TEST);
+}
+
+static void glnvg__convexFill(struct GLNVGcontext* gl, struct GLNVGcall* call)
+{
+ struct GLNVGpath* paths = &gl->paths[call->pathOffset];
+ int i, npaths = call->pathCount;
+
+ glnvg__setUniforms(gl, call->uniformOffset, call->image);
+ glnvg__checkError("convex fill");
+
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount);
+ if (gl->edgeAntiAlias) {
+ // Draw fringes
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+ }
+}
+
+static void glnvg__stroke(struct GLNVGcontext* gl, struct GLNVGcall* call)
+{
+ struct GLNVGpath* paths = &gl->paths[call->pathOffset];
+ int npaths = call->pathCount, i;
+
+ glnvg__setUniforms(gl, call->uniformOffset, call->image);
+ glnvg__checkError("stroke fill");
+
+ // Draw Strokes
+ for (i = 0; i < npaths; i++)
+ glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+}
+
+static void glnvg__triangles(struct GLNVGcontext* gl, struct GLNVGcall* call)
+{
+ glnvg__setUniforms(gl, call->uniformOffset, call->image);
+ glnvg__checkError("triangles fill");
+
+ glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount);
+}
+
+static void glnvg__renderFlush(void* uptr, int alphaBlend)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ int i;
+
+ if (gl->ncalls > 0) {
+
+ // Setup require GL state.
+ glUseProgram(gl->shader.prog);
+
+ if (alphaBlend == NVG_PREMULTIPLIED_ALPHA)
+ glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA, GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
+ else
+ glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
+ glEnable(GL_CULL_FACE);
+ glCullFace(GL_BACK);
+ glFrontFace(GL_CCW);
+ glEnable(GL_BLEND);
+ glDisable(GL_DEPTH_TEST);
+ glDisable(GL_SCISSOR_TEST);
+ glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+ glStencilMask(0xffffffff);
+ glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+ glStencilFunc(GL_ALWAYS, 0, 0xffffffff);
+ glActiveTexture(GL_TEXTURE0);
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ // Upload ubo for frag shaders
+ glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf);
+ glBufferData(GL_UNIFORM_BUFFER, gl->nuniforms * gl->fragSize, gl->uniforms, GL_STREAM_DRAW);
+#endif
+
+ // Upload vertex data
+#if defined NANOVG_GL3
+ glBindVertexArray(gl->vertArr);
+#endif
+ glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf);
+ glBufferData(GL_ARRAY_BUFFER, gl->nverts * sizeof(struct NVGvertex), gl->verts, GL_STREAM_DRAW);
+ glEnableVertexAttribArray(0);
+ glEnableVertexAttribArray(1);
+ glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(size_t)0);
+ glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(struct NVGvertex), (const GLvoid*)(0 + 2*sizeof(float)));
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ // once per frame set ubo for view
+ glBindBuffer(GL_UNIFORM_BUFFER, gl->viewBuf);
+ glBufferData(GL_UNIFORM_BUFFER, sizeof(gl->view), 0, GL_STREAM_DRAW);
+ glBufferData(GL_UNIFORM_BUFFER, sizeof(gl->view), gl->view, GL_STREAM_DRAW);
+ glBindBufferBase(GL_UNIFORM_BUFFER, GLNVG_VIEW_BINDING, gl->viewBuf);
+
+ glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf);
+#else
+ glUniform1i(gl->shader.loc[GLNVG_LOC_TEX], 0);
+ glUniform2fv(gl->shader.loc[GLNVG_LOC_VIEWSIZE], 1, gl->view);
+#endif
+
+ for (i = 0; i < gl->ncalls; i++) {
+ struct GLNVGcall* call = &gl->calls[i];
+ if (call->type == GLNVG_FILL)
+ glnvg__fill(gl, call);
+ else if (call->type == GLNVG_CONVEXFILL)
+ glnvg__convexFill(gl, call);
+ else if (call->type == GLNVG_STROKE)
+ glnvg__stroke(gl, call);
+ else if (call->type == GLNVG_TRIANGLES)
+ glnvg__triangles(gl, call);
+ }
+
+ glDisableVertexAttribArray(0);
+ glDisableVertexAttribArray(1);
+#if defined NANOVG_GL3
+ glBindVertexArray(0);
+#endif
+ glUseProgram(0);
+ glBindTexture(GL_TEXTURE_2D, 0);
+ }
+
+ // Reset calls
+ gl->nverts = 0;
+ gl->npaths = 0;
+ gl->ncalls = 0;
+ gl->nuniforms = 0;
+}
+
+static int glnvg__maxVertCount(const struct NVGpath* paths, int npaths)
+{
+ int i, count = 0;
+ for (i = 0; i < npaths; i++) {
+ count += paths[i].nfill;
+ count += paths[i].nstroke;
+ }
+ return count;
+}
+
+static struct GLNVGcall* glnvg__allocCall(struct GLNVGcontext* gl)
+{
+ struct GLNVGcall* ret = NULL;
+ if (gl->ncalls+1 > gl->ccalls) {
+ struct GLNVGcall* calls;
+ int ccalls = glnvg__maxi(gl->ncalls+1, 128) + gl->ccalls; // 1.5x Overallocate
+ calls = (struct GLNVGcall*)realloc(gl->calls, sizeof(struct GLNVGcall) * ccalls);
+ if (calls == NULL) return NULL;
+ gl->calls = calls;
+ gl->ccalls = ccalls;
+ }
+ ret = &gl->calls[gl->ncalls++];
+ memset(ret, 0, sizeof(struct GLNVGcall));
+ return ret;
+}
+
+static int glnvg__allocPaths(struct GLNVGcontext* gl, int n)
+{
+ int ret = 0;
+ if (gl->npaths+n > gl->cpaths) {
+ struct GLNVGpath* paths;
+ int cpaths = glnvg__maxi(gl->npaths + n, 128) + gl->cpaths; // 1.5x Overallocate
+ paths = (struct GLNVGpath*)realloc(gl->paths, sizeof(struct GLNVGpath) * cpaths);
+ if (paths == NULL) return -1;
+ gl->paths = paths;
+ gl->cpaths = cpaths;
+ }
+ ret = gl->npaths;
+ gl->npaths += n;
+ return ret;
+}
+
+static int glnvg__allocVerts(struct GLNVGcontext* gl, int n)
+{
+ int ret = 0;
+ if (gl->nverts+n > gl->cverts) {
+ struct NVGvertex* verts;
+ int cverts = glnvg__maxi(gl->nverts + n, 4096) + gl->cverts/2; // 1.5x Overallocate
+ verts = (struct NVGvertex*)realloc(gl->verts, sizeof(struct NVGvertex) * cverts);
+ if (verts == NULL) return -1;
+ gl->verts = verts;
+ gl->cverts = cverts;
+ }
+ ret = gl->nverts;
+ gl->nverts += n;
+ return ret;
+}
+
+static int glnvg__allocFragUniforms(struct GLNVGcontext* gl, int n)
+{
+ int ret = 0, structSize = gl->fragSize;
+ if (gl->nuniforms+n > gl->cuniforms) {
+ unsigned char* uniforms;
+ int cuniforms = glnvg__maxi(gl->nuniforms+n, 128) + gl->cuniforms/2; // 1.5x Overallocate
+ uniforms = (unsigned char*)realloc(gl->uniforms, structSize * cuniforms);
+ if (uniforms == NULL) return -1;
+ gl->uniforms = uniforms;
+ gl->cuniforms = cuniforms;
+ }
+ ret = gl->nuniforms * structSize;
+ gl->nuniforms += n;
+ return ret;
+}
+
+static struct GLNVGfragUniforms* nvg__fragUniformPtr(struct GLNVGcontext* gl, int i)
+{
+ return (struct GLNVGfragUniforms*)&gl->uniforms[i];
+}
+
+static void glnvg__vset(struct NVGvertex* vtx, float x, float y, float u, float v)
+{
+ vtx->x = x;
+ vtx->y = y;
+ vtx->u = u;
+ vtx->v = v;
+}
+
+static void glnvg__renderFill(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe,
+ const float* bounds, const struct NVGpath* paths, int npaths)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ struct GLNVGcall* call = glnvg__allocCall(gl);
+ struct NVGvertex* quad;
+ struct GLNVGfragUniforms* frag;
+ int i, maxverts, offset;
+
+ if (call == NULL) return;
+
+ call->type = GLNVG_FILL;
+ call->pathOffset = glnvg__allocPaths(gl, npaths);
+ if (call->pathOffset == -1) goto error;
+ call->pathCount = npaths;
+ call->image = paint->image;
+
+ if (npaths == 1 && paths[0].convex)
+ call->type = GLNVG_CONVEXFILL;
+
+ // Allocate vertices for all the paths.
+ maxverts = glnvg__maxVertCount(paths, npaths) + 6;
+ offset = glnvg__allocVerts(gl, maxverts);
+ if (offset == -1) goto error;
+
+ for (i = 0; i < npaths; i++) {
+ struct GLNVGpath* copy = &gl->paths[call->pathOffset + i];
+ const struct NVGpath* path = &paths[i];
+ memset(copy, 0, sizeof(struct GLNVGpath));
+ if (path->nfill > 0) {
+ copy->fillOffset = offset;
+ copy->fillCount = path->nfill;
+ memcpy(&gl->verts[offset], path->fill, sizeof(struct NVGvertex) * path->nfill);
+ offset += path->nfill;
+ }
+ if (path->nstroke > 0) {
+ copy->strokeOffset = offset;
+ copy->strokeCount = path->nstroke;
+ memcpy(&gl->verts[offset], path->stroke, sizeof(struct NVGvertex) * path->nstroke);
+ offset += path->nstroke;
+ }
+ }
+
+ // Quad
+ call->triangleOffset = offset;
+ call->triangleCount = 6;
+ quad = &gl->verts[call->triangleOffset];
+ glnvg__vset(&quad[0], bounds[0], bounds[3], 0.5f, 1.0f);
+ glnvg__vset(&quad[1], bounds[2], bounds[3], 0.5f, 1.0f);
+ glnvg__vset(&quad[2], bounds[2], bounds[1], 0.5f, 1.0f);
+
+ glnvg__vset(&quad[3], bounds[0], bounds[3], 0.5f, 1.0f);
+ glnvg__vset(&quad[4], bounds[2], bounds[1], 0.5f, 1.0f);
+ glnvg__vset(&quad[5], bounds[0], bounds[1], 0.5f, 1.0f);
+
+ // Setup uniforms for draw calls
+ if (call->type == GLNVG_FILL) {
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 2);
+ if (call->uniformOffset == -1) goto error;
+ // Simple shader for stencil
+ frag = nvg__fragUniformPtr(gl, call->uniformOffset);
+ memset(frag, 0, sizeof(*frag));
+ frag->type = NSVG_SHADER_SIMPLE;
+ // Fill shader
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, fringe, fringe);
+ } else {
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+ if (call->uniformOffset == -1) goto error;
+ // Fill shader
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, fringe, fringe);
+ }
+
+ return;
+
+error:
+ // We get here if call alloc was ok, but something else is not.
+ // Roll back the last call to prevent drawing it.
+ if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderStroke(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor, float fringe,
+ float strokeWidth, const struct NVGpath* paths, int npaths)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ struct GLNVGcall* call = glnvg__allocCall(gl);
+ int i, maxverts, offset;
+
+ if (call == NULL) return;
+
+ call->type = GLNVG_STROKE;
+ call->pathOffset = glnvg__allocPaths(gl, npaths);
+ if (call->pathOffset == -1) goto error;
+ call->pathCount = npaths;
+ call->image = paint->image;
+
+ // Allocate vertices for all the paths.
+ maxverts = glnvg__maxVertCount(paths, npaths);
+ offset = glnvg__allocVerts(gl, maxverts);
+ if (offset == -1) goto error;
+
+ for (i = 0; i < npaths; i++) {
+ struct GLNVGpath* copy = &gl->paths[call->pathOffset + i];
+ const struct NVGpath* path = &paths[i];
+ memset(copy, 0, sizeof(struct GLNVGpath));
+ if (path->nstroke) {
+ copy->strokeOffset = offset;
+ copy->strokeCount = path->nstroke;
+ memcpy(&gl->verts[offset], path->stroke, sizeof(struct NVGvertex) * path->nstroke);
+ offset += path->nstroke;
+ }
+ }
+
+ // Fill shader
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+ if (call->uniformOffset == -1) goto error;
+ glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe);
+
+ return;
+
+error:
+ // We get here if call alloc was ok, but something else is not.
+ // Roll back the last call to prevent drawing it.
+ if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderTriangles(void* uptr, struct NVGpaint* paint, struct NVGscissor* scissor,
+ const struct NVGvertex* verts, int nverts)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ struct GLNVGcall* call = glnvg__allocCall(gl);
+ struct GLNVGfragUniforms* frag;
+
+ if (call == NULL) return;
+
+ call->type = GLNVG_TRIANGLES;
+ call->image = paint->image;
+
+ // Allocate vertices for all the paths.
+ call->triangleOffset = glnvg__allocVerts(gl, nverts);
+ if (call->triangleOffset == -1) goto error;
+ call->triangleCount = nverts;
+
+ memcpy(&gl->verts[call->triangleOffset], verts, sizeof(struct NVGvertex) * nverts);
+
+ // Fill shader
+ call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+ if (call->uniformOffset == -1) goto error;
+ frag = nvg__fragUniformPtr(gl, call->uniformOffset);
+ glnvg__convertPaint(gl, frag, paint, scissor, 1.0f, 1.0f);
+ frag->type = NSVG_SHADER_IMG;
+
+ return;
+
+error:
+ // We get here if call alloc was ok, but something else is not.
+ // Roll back the last call to prevent drawing it.
+ if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderDelete(void* uptr)
+{
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)uptr;
+ int i;
+ if (gl == NULL) return;
+
+ glnvg__deleteShader(&gl->shader);
+
+#if NANOVG_GL3
+#if NANOVG_GL_USE_UNIFORMBUFFER
+ if (gl->viewBuf != 0)
+ glDeleteBuffers(1, &gl->viewBuf);
+ if (gl->fragBuf != 0)
+ glDeleteBuffers(1, &gl->fragBuf);
+#endif
+ if (gl->vertArr != 0)
+ glDeleteVertexArrays(1, &gl->vertArr);
+#endif
+ if (gl->vertBuf != 0)
+ glDeleteBuffers(1, &gl->vertBuf);
+
+ for (i = 0; i < gl->ntextures; i++) {
+ if (gl->textures[i].tex != 0)
+ glDeleteTextures(1, &gl->textures[i].tex);
+ }
+ free(gl->textures);
+
+ free(gl);
+}
+
+
+#if defined NANOVG_GL2
+struct NVGcontext* nvgCreateGL2(int atlasw, int atlash, int edgeaa)
+#elif defined NANOVG_GL3
+struct NVGcontext* nvgCreateGL3(int atlasw, int atlash, int edgeaa)
+#elif defined NANOVG_GLES2
+struct NVGcontext* nvgCreateGLES2(int atlasw, int atlash, int edgeaa)
+#elif defined NANOVG_GLES3
+struct NVGcontext* nvgCreateGLES3(int atlasw, int atlash, int edgeaa)
+#endif
+{
+ struct NVGparams params;
+ struct NVGcontext* ctx = NULL;
+ struct GLNVGcontext* gl = (struct GLNVGcontext*)malloc(sizeof(struct GLNVGcontext));
+ if (gl == NULL) goto error;
+ memset(gl, 0, sizeof(struct GLNVGcontext));
+
+ memset(¶ms, 0, sizeof(params));
+ params.renderCreate = glnvg__renderCreate;
+ params.renderCreateTexture = glnvg__renderCreateTexture;
+ params.renderDeleteTexture = glnvg__renderDeleteTexture;
+ params.renderUpdateTexture = glnvg__renderUpdateTexture;
+ params.renderGetTextureSize = glnvg__renderGetTextureSize;
+ params.renderViewport = glnvg__renderViewport;
+ params.renderFlush = glnvg__renderFlush;
+ params.renderFill = glnvg__renderFill;
+ params.renderStroke = glnvg__renderStroke;
+ params.renderTriangles = glnvg__renderTriangles;
+ params.renderDelete = glnvg__renderDelete;
+ params.userPtr = gl;
+ params.atlasWidth = atlasw;
+ params.atlasHeight = atlash;
+ params.edgeAntiAlias = edgeaa;
+
+ gl->edgeAntiAlias = edgeaa;
+
+ ctx = nvgCreateInternal(¶ms);
+ if (ctx == NULL) goto error;
+
+ return ctx;
+
+error:
+ // 'gl' is freed by nvgDeleteInternal.
+ if (ctx != NULL) nvgDeleteInternal(ctx);
+ return NULL;
+}
+
+#if NANOVG_GL2
+void nvgDeleteGL2(struct NVGcontext* ctx)
+#elif NANOVG_GL3
+void nvgDeleteGL3(struct NVGcontext* ctx)
+#elif NANOVG_GLES2
+void nvgDeleteGLES2(struct NVGcontext* ctx)
+#elif NANOVG_GLES3
+void nvgDeleteGLES3(struct NVGcontext* ctx)
+#endif
+{
+ nvgDeleteInternal(ctx);
+}
+
+#endif
diff --git a/dgl/src/nanovg/stb_image.c b/dgl/src/nanovg/stb_image.c
@@ -0,0 +1,4676 @@
+/* stbi-1.33 - public domain JPEG/PNG reader - http://nothings.org/stb_image.c
+ when you control the images you're loading
+ no warranty implied; use at your own risk
+
+ QUICK NOTES:
+ Primarily of interest to game developers and other people who can
+ avoid problematic images and only need the trivial interface
+
+ JPEG baseline (no JPEG progressive)
+ PNG 8-bit-per-channel only
+
+ TGA (not sure what subset, if a subset)
+ BMP non-1bpp, non-RLE
+ PSD (composited view only, no extra channels)
+
+ GIF (*comp always reports as 4-channel)
+ HDR (radiance rgbE format)
+ PIC (Softimage PIC)
+
+ - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+ - decode from arbitrary I/O callbacks
+ - overridable dequantizing-IDCT, YCbCr-to-RGB conversion (define STBI_SIMD)
+
+ Latest revisions:
+ 1.33 (2011-07-14) minor fixes suggested by Dave Moore
+ 1.32 (2011-07-13) info support for all filetypes (SpartanJ)
+ 1.31 (2011-06-19) a few more leak fixes, bug in PNG handling (SpartanJ)
+ 1.30 (2011-06-11) added ability to load files via io callbacks (Ben Wenger)
+ 1.29 (2010-08-16) various warning fixes from Aurelien Pocheville
+ 1.28 (2010-08-01) fix bug in GIF palette transparency (SpartanJ)
+ 1.27 (2010-08-01) cast-to-uint8 to fix warnings (Laurent Gomila)
+ allow trailing 0s at end of image data (Laurent Gomila)
+ 1.26 (2010-07-24) fix bug in file buffering for PNG reported by SpartanJ
+
+ See end of file for full revision history.
+
+ TODO:
+ stbi_info support for BMP,PSD,HDR,PIC
+
+
+ ============================ Contributors =========================
+
+ Image formats Optimizations & bugfixes
+ Sean Barrett (jpeg, png, bmp) Fabian "ryg" Giesen
+ Nicolas Schulz (hdr, psd)
+ Jonathan Dummer (tga) Bug fixes & warning fixes
+ Jean-Marc Lienher (gif) Marc LeBlanc
+ Tom Seddon (pic) Christpher Lloyd
+ Thatcher Ulrich (psd) Dave Moore
+ Won Chun
+ the Horde3D community
+ Extensions, features Janez Zemva
+ Jetro Lauha (stbi_info) Jonathan Blow
+ James "moose2000" Brown (iPhone PNG) Laurent Gomila
+ Ben "Disch" Wenger (io callbacks) Aruelien Pocheville
+ Martin "SpartanJ" Golini Ryamond Barbiero
+ David Woo
+
+
+ If your name should be here but isn't, let Sean know.
+
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// To get a header file for this, either cut and paste the header,
+// or create stb_image.h, #define STBI_HEADER_FILE_ONLY, and
+// then include stb_image.c from it.
+
+//// begin header file ////////////////////////////////////////////////////
+//
+// Limitations:
+// - no jpeg progressive support
+// - non-HDR formats support 8-bit samples only (jpeg, png)
+// - no delayed line count (jpeg) -- IJG doesn't support either
+// - no 1-bit BMP
+// - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below):
+// int x,y,n;
+// unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+// // ... process data if not NULL ...
+// // ... x = width, y = height, n = # 8-bit components per pixel ...
+// // ... replace '0' with '1'..'4' to force that many components per pixel
+// // ... but 'n' will always be the number that it would have been if you said 0
+// stbi_image_free(data)
+//
+// Standard parameters:
+// int *x -- outputs image width in pixels
+// int *y -- outputs image height in pixels
+// int *comp -- outputs # of image components in image file
+// int req_comp -- if non-zero, # of image components requested in result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
+// If req_comp is non-zero, *comp has the number of components that _would_
+// have been output otherwise. E.g. if you set req_comp to 4, you will always
+// get RGBA output, but you can check *comp to easily see if it's opaque.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+// N=#comp components
+// 1 grey
+// 2 grey, alpha
+// 3 red, green, blue
+// 4 red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
+// can be queried for an extremely brief, end-user unfriendly explanation
+// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
+// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
+// more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB; nominally they
+// would silently load as BGR, except the existing code should have just
+// failed on such iPhone PNGs. But you can disable this conversion by
+// by calling stbi_convert_iphone_png_to_rgb(0), in which case
+// you will always just get the native iphone "format" through.
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+// ===========================================================================
+//
+// HDR image support (disable by defining STBI_NO_HDR)
+//
+// stb_image now supports loading HDR images in general, and currently
+// the Radiance .HDR file format, although the support is provided
+// generically. You can still load any file through the existing interface;
+// if you attempt to load an HDR file, it will be automatically remapped to
+// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
+// both of these constants can be reconfigured through this interface:
+//
+// stbi_hdr_to_ldr_gamma(2.2f);
+// stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+// float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+// stbi_ldr_to_hdr_scale(1.0f);
+// stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+// stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
+
+
+#ifndef STBI_NO_STDIO
+
+#if defined(_MSC_VER) && _MSC_VER >= 0x1400
+#define _CRT_SECURE_NO_WARNINGS // suppress bogus warnings about fopen()
+#endif
+
+#include <stdio.h>
+#endif
+
+#define STBI_VERSION 1
+
+enum
+{
+ STBI_default = 0, // only used for req_comp
+
+ STBI_grey = 1,
+ STBI_grey_alpha = 2,
+ STBI_rgb = 3,
+ STBI_rgb_alpha = 4
+};
+
+typedef unsigned char stbi_uc;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+
+//
+// load image by filename, open file, or memory buffer
+//
+
+extern stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
+
+#ifndef STBI_NO_STDIO
+extern stbi_uc *stbi_load (char const *filename, int *x, int *y, int *comp, int req_comp);
+extern stbi_uc *stbi_load_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
+// for stbi_load_from_file, file pointer is left pointing immediately after image
+#endif
+
+typedef struct
+{
+ int (*read) (void *user,char *data,int size); // fill 'data' with 'size' bytes. return number of bytes actually read
+ void (*skip) (void *user,unsigned n); // skip the next 'n' bytes
+ int (*eof) (void *user); // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+
+extern stbi_uc *stbi_load_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
+
+#ifndef STBI_NO_HDR
+ extern float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
+
+ #ifndef STBI_NO_STDIO
+ extern float *stbi_loadf (char const *filename, int *x, int *y, int *comp, int req_comp);
+ extern float *stbi_loadf_from_file (FILE *f, int *x, int *y, int *comp, int req_comp);
+ #endif
+
+ extern float *stbi_loadf_from_callbacks (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
+
+ extern void stbi_hdr_to_ldr_gamma(float gamma);
+ extern void stbi_hdr_to_ldr_scale(float scale);
+
+ extern void stbi_ldr_to_hdr_gamma(float gamma);
+ extern void stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_HDR
+
+// stbi_is_hdr is always defined
+extern int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+extern int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+#ifndef STBI_NO_STDIO
+extern int stbi_is_hdr (char const *filename);
+extern int stbi_is_hdr_from_file(FILE *f);
+#endif // STBI_NO_STDIO
+
+
+// get a VERY brief reason for failure
+// NOT THREADSAFE
+extern const char *stbi_failure_reason (void);
+
+// free the loaded image -- this is just free()
+extern void stbi_image_free (void *retval_from_stbi_load);
+
+// get image dimensions & components without fully decoding
+extern int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
+extern int stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
+
+#ifndef STBI_NO_STDIO
+extern int stbi_info (char const *filename, int *x, int *y, int *comp);
+extern int stbi_info_from_file (FILE *f, int *x, int *y, int *comp);
+
+#endif
+
+
+
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+extern void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+extern void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+
+
+// ZLIB client - used by PNG, available for other purposes
+
+extern char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
+extern char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
+extern int stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+extern char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
+extern int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+
+// define faster low-level operations (typically SIMD support)
+#ifdef STBI_SIMD
+typedef void (*stbi_idct_8x8)(stbi_uc *out, int out_stride, short data[64], unsigned short *dequantize);
+// compute an integer IDCT on "input"
+// input[x] = data[x] * dequantize[x]
+// write results to 'out': 64 samples, each run of 8 spaced by 'out_stride'
+// CLAMP results to 0..255
+typedef void (*stbi_YCbCr_to_RGB_run)(stbi_uc *output, stbi_uc const *y, stbi_uc const *cb, stbi_uc const *cr, int count, int step);
+// compute a conversion from YCbCr to RGB
+// 'count' pixels
+// write pixels to 'output'; each pixel is 'step' bytes (either 3 or 4; if 4, write '255' as 4th), order R,G,B
+// y: Y input channel
+// cb: Cb input channel; scale/biased to be 0..255
+// cr: Cr input channel; scale/biased to be 0..255
+
+extern void stbi_install_idct(stbi_idct_8x8 func);
+extern void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func);
+#endif // STBI_SIMD
+
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+//// end header file /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifndef STBI_HEADER_FILE_ONLY
+
+#ifndef STBI_NO_HDR
+#include <math.h> // ldexp
+#include <string.h> // strcmp, strtok
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+#include <stdlib.h>
+#include <memory.h>
+#include <assert.h>
+#include <stdarg.h>
+
+#ifndef _MSC_VER
+ #ifdef __cplusplus
+ #define stbi_inline inline
+ #else
+ #define stbi_inline
+ #endif
+#else
+ #define stbi_inline __forceinline
+#endif
+
+
+// implementation:
+typedef unsigned char uint8;
+typedef unsigned short uint16;
+typedef signed short int16;
+typedef unsigned int uint32;
+typedef signed int int32;
+typedef unsigned int uint;
+
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(uint32)==4 ? 1 : -1];
+
+#if defined(STBI_NO_STDIO) && !defined(STBI_NO_WRITE)
+#define STBI_NO_WRITE
+#endif
+
+#define STBI_NOTUSED(v) (void)sizeof(v)
+
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+
+#ifdef STBI_HAS_LROTL
+ #define stbi_lrot(x,y) _lrotl(x,y)
+#else
+ #define stbi_lrot(x,y) (((x) << (y)) | ((x) >> (32 - (y))))
+#endif
+
+///////////////////////////////////////////////
+//
+// stbi struct and start_xxx functions
+
+// stbi structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct
+{
+ uint32 img_x, img_y;
+ int img_n, img_out_n;
+
+ stbi_io_callbacks io;
+ void *io_user_data;
+
+ int read_from_callbacks;
+ int buflen;
+ uint8 buffer_start[128];
+
+ uint8 *img_buffer, *img_buffer_end;
+ uint8 *img_buffer_original;
+} stbi;
+
+
+static void refill_buffer(stbi *s);
+
+// initialize a memory-decode context
+static void start_mem(stbi *s, uint8 const *buffer, int len)
+{
+ s->io.read = NULL;
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->img_buffer_original = (uint8 *) buffer;
+ s->img_buffer_end = (uint8 *) buffer+len;
+}
+
+// initialize a callback-based context
+static void start_callbacks(stbi *s, stbi_io_callbacks *c, void *user)
+{
+ s->io = *c;
+ s->io_user_data = user;
+ s->buflen = sizeof(s->buffer_start);
+ s->read_from_callbacks = 1;
+ s->img_buffer_original = s->buffer_start;
+ refill_buffer(s);
+}
+
+#ifndef STBI_NO_STDIO
+
+static int stdio_read(void *user, char *data, int size)
+{
+ return (int) fread(data,1,size,(FILE*) user);
+}
+
+static void stdio_skip(void *user, unsigned n)
+{
+ fseek((FILE*) user, n, SEEK_CUR);
+}
+
+static int stdio_eof(void *user)
+{
+ return feof((FILE*) user);
+}
+
+static stbi_io_callbacks stbi_stdio_callbacks =
+{
+ stdio_read,
+ stdio_skip,
+ stdio_eof,
+};
+
+static void start_file(stbi *s, FILE *f)
+{
+ start_callbacks(s, &stbi_stdio_callbacks, (void *) f);
+}
+
+//static void stop_file(stbi *s) { }
+
+#endif // !STBI_NO_STDIO
+
+static void stbi_rewind(stbi *s)
+{
+ // conceptually rewind SHOULD rewind to the beginning of the stream,
+ // but we just rewind to the beginning of the initial buffer, because
+ // we only use it after doing 'test', which only ever looks at at most 92 bytes
+ s->img_buffer = s->img_buffer_original;
+}
+
+static int stbi_jpeg_test(stbi *s);
+static stbi_uc *stbi_jpeg_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_jpeg_info(stbi *s, int *x, int *y, int *comp);
+static int stbi_png_test(stbi *s);
+static stbi_uc *stbi_png_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_png_info(stbi *s, int *x, int *y, int *comp);
+static int stbi_bmp_test(stbi *s);
+static stbi_uc *stbi_bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_tga_test(stbi *s);
+static stbi_uc *stbi_tga_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_tga_info(stbi *s, int *x, int *y, int *comp);
+static int stbi_psd_test(stbi *s);
+static stbi_uc *stbi_psd_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_hdr_test(stbi *s);
+static float *stbi_hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_pic_test(stbi *s);
+static stbi_uc *stbi_pic_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_gif_test(stbi *s);
+static stbi_uc *stbi_gif_load(stbi *s, int *x, int *y, int *comp, int req_comp);
+static int stbi_gif_info(stbi *s, int *x, int *y, int *comp);
+
+
+// this is not threadsafe
+static const char *failure_reason;
+
+const char *stbi_failure_reason(void)
+{
+ return failure_reason;
+}
+
+static int e(const char *str)
+{
+ failure_reason = str;
+ return 0;
+}
+
+// e - error
+// epf - error returning pointer to float
+// epuc - error returning pointer to unsigned char
+
+#ifdef STBI_NO_FAILURE_STRINGS
+ #define e(x,y) 0
+#elif defined(STBI_FAILURE_USERMSG)
+ #define e(x,y) e(y)
+#else
+ #define e(x,y) e(x)
+#endif
+
+#define epf(x,y) ((float *) (e(x,y)?NULL:NULL))
+#define epuc(x,y) ((unsigned char *) (e(x,y)?NULL:NULL))
+
+void stbi_image_free(void *retval_from_stbi_load)
+{
+ free(retval_from_stbi_load);
+}
+
+#ifndef STBI_NO_HDR
+static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp);
+#endif
+
+static unsigned char *stbi_load_main(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ if (stbi_jpeg_test(s)) return stbi_jpeg_load(s,x,y,comp,req_comp);
+ if (stbi_png_test(s)) return stbi_png_load(s,x,y,comp,req_comp);
+ if (stbi_bmp_test(s)) return stbi_bmp_load(s,x,y,comp,req_comp);
+ if (stbi_gif_test(s)) return stbi_gif_load(s,x,y,comp,req_comp);
+ if (stbi_psd_test(s)) return stbi_psd_load(s,x,y,comp,req_comp);
+ if (stbi_pic_test(s)) return stbi_pic_load(s,x,y,comp,req_comp);
+
+ #ifndef STBI_NO_HDR
+ if (stbi_hdr_test(s)) {
+ float *hdr = stbi_hdr_load(s, x,y,comp,req_comp);
+ return hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+ }
+ #endif
+
+ // test tga last because it's a crappy test!
+ if (stbi_tga_test(s))
+ return stbi_tga_load(s,x,y,comp,req_comp);
+ return epuc("unknown image type", "Image not of any known type, or corrupt");
+}
+
+#ifndef STBI_NO_STDIO
+unsigned char *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+ FILE *f = fopen(filename, "rb");
+ unsigned char *result;
+ if (!f) return epuc("can't fopen", "Unable to open file");
+ result = stbi_load_from_file(f,x,y,comp,req_comp);
+ fclose(f);
+ return result;
+}
+
+unsigned char *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+ stbi s;
+ start_file(&s,f);
+ return stbi_load_main(&s,x,y,comp,req_comp);
+}
+#endif //!STBI_NO_STDIO
+
+unsigned char *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+ stbi s;
+ start_mem(&s,buffer,len);
+ return stbi_load_main(&s,x,y,comp,req_comp);
+}
+
+unsigned char *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+ stbi s;
+ start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+ return stbi_load_main(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_HDR
+
+float *stbi_loadf_main(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ unsigned char *data;
+ #ifndef STBI_NO_HDR
+ if (stbi_hdr_test(s))
+ return stbi_hdr_load(s,x,y,comp,req_comp);
+ #endif
+ data = stbi_load_main(s, x, y, comp, req_comp);
+ if (data)
+ return ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+ return epf("unknown image type", "Image not of any known type, or corrupt");
+}
+
+float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+ stbi s;
+ start_mem(&s,buffer,len);
+ return stbi_loadf_main(&s,x,y,comp,req_comp);
+}
+
+float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+ stbi s;
+ start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+ return stbi_loadf_main(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_STDIO
+float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+ FILE *f = fopen(filename, "rb");
+ float *result;
+ if (!f) return epf("can't fopen", "Unable to open file");
+ result = stbi_loadf_from_file(f,x,y,comp,req_comp);
+ fclose(f);
+ return result;
+}
+
+float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+ stbi s;
+ start_file(&s,f);
+ return stbi_loadf_main(&s,x,y,comp,req_comp);
+}
+#endif // !STBI_NO_STDIO
+
+#endif // !STBI_NO_HDR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_HDR is
+// defined, for API simplicity; if STBI_NO_HDR is defined, it always
+// reports false!
+
+int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
+{
+ #ifndef STBI_NO_HDR
+ stbi s;
+ start_mem(&s,buffer,len);
+ return stbi_hdr_test(&s);
+ #else
+ STBI_NOTUSED(buffer);
+ STBI_NOTUSED(len);
+ return 0;
+ #endif
+}
+
+#ifndef STBI_NO_STDIO
+extern int stbi_is_hdr (char const *filename)
+{
+ FILE *f = fopen(filename, "rb");
+ int result=0;
+ if (f) {
+ result = stbi_is_hdr_from_file(f);
+ fclose(f);
+ }
+ return result;
+}
+
+extern int stbi_is_hdr_from_file(FILE *f)
+{
+ #ifndef STBI_NO_HDR
+ stbi s;
+ start_file(&s,f);
+ return stbi_hdr_test(&s);
+ #else
+ return 0;
+ #endif
+}
+#endif // !STBI_NO_STDIO
+
+extern int stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
+{
+ #ifndef STBI_NO_HDR
+ stbi s;
+ start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+ return stbi_hdr_test(&s);
+ #else
+ return 0;
+ #endif
+}
+
+#ifndef STBI_NO_HDR
+static float h2l_gamma_i=1.0f/2.2f, h2l_scale_i=1.0f;
+static float l2h_gamma=2.2f, l2h_scale=1.0f;
+
+void stbi_hdr_to_ldr_gamma(float gamma) { h2l_gamma_i = 1/gamma; }
+void stbi_hdr_to_ldr_scale(float scale) { h2l_scale_i = 1/scale; }
+
+void stbi_ldr_to_hdr_gamma(float gamma) { l2h_gamma = gamma; }
+void stbi_ldr_to_hdr_scale(float scale) { l2h_scale = scale; }
+#endif
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum
+{
+ SCAN_load=0,
+ SCAN_type,
+ SCAN_header
+};
+
+static void refill_buffer(stbi *s)
+{
+ int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
+ if (n == 0) {
+ // at end of file, treat same as if from memory
+ s->read_from_callbacks = 0;
+ s->img_buffer = s->img_buffer_end-1;
+ *s->img_buffer = 0;
+ } else {
+ s->img_buffer = s->buffer_start;
+ s->img_buffer_end = s->buffer_start + n;
+ }
+}
+
+stbi_inline static int get8(stbi *s)
+{
+ if (s->img_buffer < s->img_buffer_end)
+ return *s->img_buffer++;
+ if (s->read_from_callbacks) {
+ refill_buffer(s);
+ return *s->img_buffer++;
+ }
+ return 0;
+}
+
+stbi_inline static int at_eof(stbi *s)
+{
+ if (s->io.read) {
+ if (!(s->io.eof)(s->io_user_data)) return 0;
+ // if feof() is true, check if buffer = end
+ // special case: we've only got the special 0 character at the end
+ if (s->read_from_callbacks == 0) return 1;
+ }
+
+ return s->img_buffer >= s->img_buffer_end;
+}
+
+stbi_inline static uint8 get8u(stbi *s)
+{
+ return (uint8) get8(s);
+}
+
+static void skip(stbi *s, int n)
+{
+ if (s->io.read) {
+ int blen = s->img_buffer_end - s->img_buffer;
+ if (blen < n) {
+ s->img_buffer = s->img_buffer_end;
+ (s->io.skip)(s->io_user_data, n - blen);
+ return;
+ }
+ }
+ s->img_buffer += n;
+}
+
+static int getn(stbi *s, stbi_uc *buffer, int n)
+{
+ if (s->io.read) {
+ int blen = s->img_buffer_end - s->img_buffer;
+ if (blen < n) {
+ int res, count;
+
+ memcpy(buffer, s->img_buffer, blen);
+
+ count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
+ res = (count == (n-blen));
+ s->img_buffer = s->img_buffer_end;
+ return res;
+ }
+ }
+
+ if (s->img_buffer+n <= s->img_buffer_end) {
+ memcpy(buffer, s->img_buffer, n);
+ s->img_buffer += n;
+ return 1;
+ } else
+ return 0;
+}
+
+static int get16(stbi *s)
+{
+ int z = get8(s);
+ return (z << 8) + get8(s);
+}
+
+static uint32 get32(stbi *s)
+{
+ uint32 z = get16(s);
+ return (z << 16) + get16(s);
+}
+
+static int get16le(stbi *s)
+{
+ int z = get8(s);
+ return z + (get8(s) << 8);
+}
+
+static uint32 get32le(stbi *s)
+{
+ uint32 z = get16le(s);
+ return z + (get16le(s) << 16);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// generic converter from built-in img_n to req_comp
+// individual types do this automatically as much as possible (e.g. jpeg
+// does all cases internally since it needs to colorspace convert anyway,
+// and it never has alpha, so very few cases ). png can automatically
+// interleave an alpha=255 channel, but falls back to this for other cases
+//
+// assume data buffer is malloced, so malloc a new one and free that one
+// only failure mode is malloc failing
+
+static uint8 compute_y(int r, int g, int b)
+{
+ return (uint8) (((r*77) + (g*150) + (29*b)) >> 8);
+}
+
+static unsigned char *convert_format(unsigned char *data, int img_n, int req_comp, uint x, uint y)
+{
+ int i,j;
+ unsigned char *good;
+
+ if (req_comp == img_n) return data;
+ assert(req_comp >= 1 && req_comp <= 4);
+
+ good = (unsigned char *) malloc(req_comp * x * y);
+ if (good == NULL) {
+ free(data);
+ return epuc("outofmem", "Out of memory");
+ }
+
+ for (j=0; j < (int) y; ++j) {
+ unsigned char *src = data + j * x * img_n ;
+ unsigned char *dest = good + j * x * req_comp;
+
+ #define COMBO(a,b) ((a)*8+(b))
+ #define CASE(a,b) case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
+ // convert source image with img_n components to one with req_comp components;
+ // avoid switch per pixel, so use switch per scanline and massive macros
+ switch (COMBO(img_n, req_comp)) {
+ CASE(1,2) dest[0]=src[0], dest[1]=255; break;
+ CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+ CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break;
+ CASE(2,1) dest[0]=src[0]; break;
+ CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+ CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break;
+ CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break;
+ CASE(3,1) dest[0]=compute_y(src[0],src[1],src[2]); break;
+ CASE(3,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = 255; break;
+ CASE(4,1) dest[0]=compute_y(src[0],src[1],src[2]); break;
+ CASE(4,2) dest[0]=compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break;
+ CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break;
+ default: assert(0);
+ }
+ #undef CASE
+ }
+
+ free(data);
+ return good;
+}
+
+#ifndef STBI_NO_HDR
+static float *ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+ int i,k,n;
+ float *output = (float *) malloc(x * y * comp * sizeof(float));
+ if (output == NULL) { free(data); return epf("outofmem", "Out of memory"); }
+ // compute number of non-alpha components
+ if (comp & 1) n = comp; else n = comp-1;
+ for (i=0; i < x*y; ++i) {
+ for (k=0; k < n; ++k) {
+ output[i*comp + k] = (float) pow(data[i*comp+k]/255.0f, l2h_gamma) * l2h_scale;
+ }
+ if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
+ }
+ free(data);
+ return output;
+}
+
+#define float2int(x) ((int) (x))
+static stbi_uc *hdr_to_ldr(float *data, int x, int y, int comp)
+{
+ int i,k,n;
+ stbi_uc *output = (stbi_uc *) malloc(x * y * comp);
+ if (output == NULL) { free(data); return epuc("outofmem", "Out of memory"); }
+ // compute number of non-alpha components
+ if (comp & 1) n = comp; else n = comp-1;
+ for (i=0; i < x*y; ++i) {
+ for (k=0; k < n; ++k) {
+ float z = (float) pow(data[i*comp+k]*h2l_scale_i, h2l_gamma_i) * 255 + 0.5f;
+ if (z < 0) z = 0;
+ if (z > 255) z = 255;
+ output[i*comp + k] = (uint8) float2int(z);
+ }
+ if (k < comp) {
+ float z = data[i*comp+k] * 255 + 0.5f;
+ if (z < 0) z = 0;
+ if (z > 255) z = 255;
+ output[i*comp + k] = (uint8) float2int(z);
+ }
+ }
+ free(data);
+ return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// "baseline" JPEG/JFIF decoder (not actually fully baseline implementation)
+//
+// simple implementation
+// - channel subsampling of at most 2 in each dimension
+// - doesn't support delayed output of y-dimension
+// - simple interface (only one output format: 8-bit interleaved RGB)
+// - doesn't try to recover corrupt jpegs
+// - doesn't allow partial loading, loading multiple at once
+// - still fast on x86 (copying globals into locals doesn't help x86)
+// - allocates lots of intermediate memory (full size of all components)
+// - non-interleaved case requires this anyway
+// - allows good upsampling (see next)
+// high-quality
+// - upsampled channels are bilinearly interpolated, even across blocks
+// - quality integer IDCT derived from IJG's 'slow'
+// performance
+// - fast huffman; reasonable integer IDCT
+// - uses a lot of intermediate memory, could cache poorly
+// - load http://nothings.org/remote/anemones.jpg 3 times on 2.8Ghz P4
+// stb_jpeg: 1.34 seconds (MSVC6, default release build)
+// stb_jpeg: 1.06 seconds (MSVC6, processor = Pentium Pro)
+// IJL11.dll: 1.08 seconds (compiled by intel)
+// IJG 1998: 0.98 seconds (MSVC6, makefile provided by IJG)
+// IJG 1998: 0.95 seconds (MSVC6, makefile + proc=PPro)
+
+// huffman decoding acceleration
+#define FAST_BITS 9 // larger handles more cases; smaller stomps less cache
+
+typedef struct
+{
+ uint8 fast[1 << FAST_BITS];
+ // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+ uint16 code[256];
+ uint8 values[256];
+ uint8 size[257];
+ unsigned int maxcode[18];
+ int delta[17]; // old 'firstsymbol' - old 'firstcode'
+} huffman;
+
+typedef struct
+{
+ #ifdef STBI_SIMD
+ unsigned short dequant2[4][64];
+ #endif
+ stbi *s;
+ huffman huff_dc[4];
+ huffman huff_ac[4];
+ uint8 dequant[4][64];
+
+// sizes for components, interleaved MCUs
+ int img_h_max, img_v_max;
+ int img_mcu_x, img_mcu_y;
+ int img_mcu_w, img_mcu_h;
+
+// definition of jpeg image component
+ struct
+ {
+ int id;
+ int h,v;
+ int tq;
+ int hd,ha;
+ int dc_pred;
+
+ int x,y,w2,h2;
+ uint8 *data;
+ void *raw_data;
+ uint8 *linebuf;
+ } img_comp[4];
+
+ uint32 code_buffer; // jpeg entropy-coded buffer
+ int code_bits; // number of valid bits
+ unsigned char marker; // marker seen while filling entropy buffer
+ int nomore; // flag if we saw a marker so must stop
+
+ int scan_n, order[4];
+ int restart_interval, todo;
+} jpeg;
+
+static int build_huffman(huffman *h, int *count)
+{
+ int i,j,k=0,code;
+ // build size list for each symbol (from JPEG spec)
+ for (i=0; i < 16; ++i)
+ for (j=0; j < count[i]; ++j)
+ h->size[k++] = (uint8) (i+1);
+ h->size[k] = 0;
+
+ // compute actual symbols (from jpeg spec)
+ code = 0;
+ k = 0;
+ for(j=1; j <= 16; ++j) {
+ // compute delta to add to code to compute symbol id
+ h->delta[j] = k - code;
+ if (h->size[k] == j) {
+ while (h->size[k] == j)
+ h->code[k++] = (uint16) (code++);
+ if (code-1 >= (1 << j)) return e("bad code lengths","Corrupt JPEG");
+ }
+ // compute largest code + 1 for this size, preshifted as needed later
+ h->maxcode[j] = code << (16-j);
+ code <<= 1;
+ }
+ h->maxcode[j] = 0xffffffff;
+
+ // build non-spec acceleration table; 255 is flag for not-accelerated
+ memset(h->fast, 255, 1 << FAST_BITS);
+ for (i=0; i < k; ++i) {
+ int s = h->size[i];
+ if (s <= FAST_BITS) {
+ int c = h->code[i] << (FAST_BITS-s);
+ int m = 1 << (FAST_BITS-s);
+ for (j=0; j < m; ++j) {
+ h->fast[c+j] = (uint8) i;
+ }
+ }
+ }
+ return 1;
+}
+
+static void grow_buffer_unsafe(jpeg *j)
+{
+ do {
+ int b = j->nomore ? 0 : get8(j->s);
+ if (b == 0xff) {
+ int c = get8(j->s);
+ if (c != 0) {
+ j->marker = (unsigned char) c;
+ j->nomore = 1;
+ return;
+ }
+ }
+ j->code_buffer |= b << (24 - j->code_bits);
+ j->code_bits += 8;
+ } while (j->code_bits <= 24);
+}
+
+// (1 << n) - 1
+static uint32 bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
+
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int decode(jpeg *j, huffman *h)
+{
+ unsigned int temp;
+ int c,k;
+
+ if (j->code_bits < 16) grow_buffer_unsafe(j);
+
+ // look at the top FAST_BITS and determine what symbol ID it is,
+ // if the code is <= FAST_BITS
+ c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+ k = h->fast[c];
+ if (k < 255) {
+ int s = h->size[k];
+ if (s > j->code_bits)
+ return -1;
+ j->code_buffer <<= s;
+ j->code_bits -= s;
+ return h->values[k];
+ }
+
+ // naive test is to shift the code_buffer down so k bits are
+ // valid, then test against maxcode. To speed this up, we've
+ // preshifted maxcode left so that it has (16-k) 0s at the
+ // end; in other words, regardless of the number of bits, it
+ // wants to be compared against something shifted to have 16;
+ // that way we don't need to shift inside the loop.
+ temp = j->code_buffer >> 16;
+ for (k=FAST_BITS+1 ; ; ++k)
+ if (temp < h->maxcode[k])
+ break;
+ if (k == 17) {
+ // error! code not found
+ j->code_bits -= 16;
+ return -1;
+ }
+
+ if (k > j->code_bits)
+ return -1;
+
+ // convert the huffman code to the symbol id
+ c = ((j->code_buffer >> (32 - k)) & bmask[k]) + h->delta[k];
+ assert((((j->code_buffer) >> (32 - h->size[c])) & bmask[h->size[c]]) == h->code[c]);
+
+ // convert the id to a symbol
+ j->code_bits -= k;
+ j->code_buffer <<= k;
+ return h->values[c];
+}
+
+// combined JPEG 'receive' and JPEG 'extend', since baseline
+// always extends everything it receives.
+stbi_inline static int extend_receive(jpeg *j, int n)
+{
+ unsigned int m = 1 << (n-1);
+ unsigned int k;
+ if (j->code_bits < n) grow_buffer_unsafe(j);
+
+ #if 1
+ k = stbi_lrot(j->code_buffer, n);
+ j->code_buffer = k & ~bmask[n];
+ k &= bmask[n];
+ j->code_bits -= n;
+ #else
+ k = (j->code_buffer >> (32 - n)) & bmask[n];
+ j->code_bits -= n;
+ j->code_buffer <<= n;
+ #endif
+ // the following test is probably a random branch that won't
+ // predict well. I tried to table accelerate it but failed.
+ // maybe it's compiling as a conditional move?
+ if (k < m)
+ return (-1 << n) + k + 1;
+ else
+ return k;
+}
+
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static uint8 dezigzag[64+15] =
+{
+ 0, 1, 8, 16, 9, 2, 3, 10,
+ 17, 24, 32, 25, 18, 11, 4, 5,
+ 12, 19, 26, 33, 40, 48, 41, 34,
+ 27, 20, 13, 6, 7, 14, 21, 28,
+ 35, 42, 49, 56, 57, 50, 43, 36,
+ 29, 22, 15, 23, 30, 37, 44, 51,
+ 58, 59, 52, 45, 38, 31, 39, 46,
+ 53, 60, 61, 54, 47, 55, 62, 63,
+ // let corrupt input sample past end
+ 63, 63, 63, 63, 63, 63, 63, 63,
+ 63, 63, 63, 63, 63, 63, 63
+};
+
+// decode one 64-entry block--
+static int decode_block(jpeg *j, short data[64], huffman *hdc, huffman *hac, int b)
+{
+ int diff,dc,k;
+ int t = decode(j, hdc);
+ if (t < 0) return e("bad huffman code","Corrupt JPEG");
+
+ // 0 all the ac values now so we can do it 32-bits at a time
+ memset(data,0,64*sizeof(data[0]));
+
+ diff = t ? extend_receive(j, t) : 0;
+ dc = j->img_comp[b].dc_pred + diff;
+ j->img_comp[b].dc_pred = dc;
+ data[0] = (short) dc;
+
+ // decode AC components, see JPEG spec
+ k = 1;
+ do {
+ int r,s;
+ int rs = decode(j, hac);
+ if (rs < 0) return e("bad huffman code","Corrupt JPEG");
+ s = rs & 15;
+ r = rs >> 4;
+ if (s == 0) {
+ if (rs != 0xf0) break; // end block
+ k += 16;
+ } else {
+ k += r;
+ // decode into unzigzag'd location
+ data[dezigzag[k++]] = (short) extend_receive(j,s);
+ }
+ } while (k < 64);
+ return 1;
+}
+
+// take a -128..127 value and clamp it and convert to 0..255
+stbi_inline static uint8 clamp(int x)
+{
+ // trick to use a single test to catch both cases
+ if ((unsigned int) x > 255) {
+ if (x < 0) return 0;
+ if (x > 255) return 255;
+ }
+ return (uint8) x;
+}
+
+#define f2f(x) (int) (((x) * 4096 + 0.5))
+#define fsh(x) ((x) << 12)
+
+// derived from jidctint -- DCT_ISLOW
+#define IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
+ int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
+ p2 = s2; \
+ p3 = s6; \
+ p1 = (p2+p3) * f2f(0.5411961f); \
+ t2 = p1 + p3*f2f(-1.847759065f); \
+ t3 = p1 + p2*f2f( 0.765366865f); \
+ p2 = s0; \
+ p3 = s4; \
+ t0 = fsh(p2+p3); \
+ t1 = fsh(p2-p3); \
+ x0 = t0+t3; \
+ x3 = t0-t3; \
+ x1 = t1+t2; \
+ x2 = t1-t2; \
+ t0 = s7; \
+ t1 = s5; \
+ t2 = s3; \
+ t3 = s1; \
+ p3 = t0+t2; \
+ p4 = t1+t3; \
+ p1 = t0+t3; \
+ p2 = t1+t2; \
+ p5 = (p3+p4)*f2f( 1.175875602f); \
+ t0 = t0*f2f( 0.298631336f); \
+ t1 = t1*f2f( 2.053119869f); \
+ t2 = t2*f2f( 3.072711026f); \
+ t3 = t3*f2f( 1.501321110f); \
+ p1 = p5 + p1*f2f(-0.899976223f); \
+ p2 = p5 + p2*f2f(-2.562915447f); \
+ p3 = p3*f2f(-1.961570560f); \
+ p4 = p4*f2f(-0.390180644f); \
+ t3 += p1+p4; \
+ t2 += p2+p3; \
+ t1 += p2+p4; \
+ t0 += p1+p3;
+
+#ifdef STBI_SIMD
+typedef unsigned short stbi_dequantize_t;
+#else
+typedef uint8 stbi_dequantize_t;
+#endif
+
+// .344 seconds on 3*anemones.jpg
+static void idct_block(uint8 *out, int out_stride, short data[64], stbi_dequantize_t *dequantize)
+{
+ int i,val[64],*v=val;
+ stbi_dequantize_t *dq = dequantize;
+ uint8 *o;
+ short *d = data;
+
+ // columns
+ for (i=0; i < 8; ++i,++d,++dq, ++v) {
+ // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+ if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
+ && d[40]==0 && d[48]==0 && d[56]==0) {
+ // no shortcut 0 seconds
+ // (1|2|3|4|5|6|7)==0 0 seconds
+ // all separate -0.047 seconds
+ // 1 && 2|3 && 4|5 && 6|7: -0.047 seconds
+ int dcterm = d[0] * dq[0] << 2;
+ v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+ } else {
+ IDCT_1D(d[ 0]*dq[ 0],d[ 8]*dq[ 8],d[16]*dq[16],d[24]*dq[24],
+ d[32]*dq[32],d[40]*dq[40],d[48]*dq[48],d[56]*dq[56])
+ // constants scaled things up by 1<<12; let's bring them back
+ // down, but keep 2 extra bits of precision
+ x0 += 512; x1 += 512; x2 += 512; x3 += 512;
+ v[ 0] = (x0+t3) >> 10;
+ v[56] = (x0-t3) >> 10;
+ v[ 8] = (x1+t2) >> 10;
+ v[48] = (x1-t2) >> 10;
+ v[16] = (x2+t1) >> 10;
+ v[40] = (x2-t1) >> 10;
+ v[24] = (x3+t0) >> 10;
+ v[32] = (x3-t0) >> 10;
+ }
+ }
+
+ for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
+ // no fast case since the first 1D IDCT spread components out
+ IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
+ // constants scaled things up by 1<<12, plus we had 1<<2 from first
+ // loop, plus horizontal and vertical each scale by sqrt(8) so together
+ // we've got an extra 1<<3, so 1<<17 total we need to remove.
+ // so we want to round that, which means adding 0.5 * 1<<17,
+ // aka 65536. Also, we'll end up with -128 to 127 that we want
+ // to encode as 0..255 by adding 128, so we'll add that before the shift
+ x0 += 65536 + (128<<17);
+ x1 += 65536 + (128<<17);
+ x2 += 65536 + (128<<17);
+ x3 += 65536 + (128<<17);
+ // tried computing the shifts into temps, or'ing the temps to see
+ // if any were out of range, but that was slower
+ o[0] = clamp((x0+t3) >> 17);
+ o[7] = clamp((x0-t3) >> 17);
+ o[1] = clamp((x1+t2) >> 17);
+ o[6] = clamp((x1-t2) >> 17);
+ o[2] = clamp((x2+t1) >> 17);
+ o[5] = clamp((x2-t1) >> 17);
+ o[3] = clamp((x3+t0) >> 17);
+ o[4] = clamp((x3-t0) >> 17);
+ }
+}
+
+#ifdef STBI_SIMD
+static stbi_idct_8x8 stbi_idct_installed = idct_block;
+
+void stbi_install_idct(stbi_idct_8x8 func)
+{
+ stbi_idct_installed = func;
+}
+#endif
+
+#define MARKER_none 0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static uint8 get_marker(jpeg *j)
+{
+ uint8 x;
+ if (j->marker != MARKER_none) { x = j->marker; j->marker = MARKER_none; return x; }
+ x = get8u(j->s);
+ if (x != 0xff) return MARKER_none;
+ while (x == 0xff)
+ x = get8u(j->s);
+ return x;
+}
+
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define RESTART(x) ((x) >= 0xd0 && (x) <= 0xd7)
+
+// after a restart interval, reset the entropy decoder and
+// the dc prediction
+static void reset(jpeg *j)
+{
+ j->code_bits = 0;
+ j->code_buffer = 0;
+ j->nomore = 0;
+ j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0;
+ j->marker = MARKER_none;
+ j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+ // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+ // since we don't even allow 1<<30 pixels
+}
+
+static int parse_entropy_coded_data(jpeg *z)
+{
+ reset(z);
+ if (z->scan_n == 1) {
+ int i,j;
+ #ifdef STBI_SIMD
+ __declspec(align(16))
+ #endif
+ short data[64];
+ int n = z->order[0];
+ // non-interleaved data, we just need to process one block at a time,
+ // in trivial scanline order
+ // number of blocks to do just depends on how many actual "pixels" this
+ // component has, independent of interleaved MCU blocking and such
+ int w = (z->img_comp[n].x+7) >> 3;
+ int h = (z->img_comp[n].y+7) >> 3;
+ for (j=0; j < h; ++j) {
+ for (i=0; i < w; ++i) {
+ if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
+ #ifdef STBI_SIMD
+ stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
+ #else
+ idct_block(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
+ #endif
+ // every data block is an MCU, so countdown the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24) grow_buffer_unsafe(z);
+ // if it's NOT a restart, then just bail, so we get corrupt data
+ // rather than no data
+ if (!RESTART(z->marker)) return 1;
+ reset(z);
+ }
+ }
+ }
+ } else { // interleaved!
+ int i,j,k,x,y;
+ short data[64];
+ for (j=0; j < z->img_mcu_y; ++j) {
+ for (i=0; i < z->img_mcu_x; ++i) {
+ // scan an interleaved mcu... process scan_n components in order
+ for (k=0; k < z->scan_n; ++k) {
+ int n = z->order[k];
+ // scan out an mcu's worth of this component; that's just determined
+ // by the basic H and V specified for the component
+ for (y=0; y < z->img_comp[n].v; ++y) {
+ for (x=0; x < z->img_comp[n].h; ++x) {
+ int x2 = (i*z->img_comp[n].h + x)*8;
+ int y2 = (j*z->img_comp[n].v + y)*8;
+ if (!decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+z->img_comp[n].ha, n)) return 0;
+ #ifdef STBI_SIMD
+ stbi_idct_installed(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant2[z->img_comp[n].tq]);
+ #else
+ idct_block(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data, z->dequant[z->img_comp[n].tq]);
+ #endif
+ }
+ }
+ }
+ // after all interleaved components, that's an interleaved MCU,
+ // so now count down the restart interval
+ if (--z->todo <= 0) {
+ if (z->code_bits < 24) grow_buffer_unsafe(z);
+ // if it's NOT a restart, then just bail, so we get corrupt data
+ // rather than no data
+ if (!RESTART(z->marker)) return 1;
+ reset(z);
+ }
+ }
+ }
+ }
+ return 1;
+}
+
+static int process_marker(jpeg *z, int m)
+{
+ int L;
+ switch (m) {
+ case MARKER_none: // no marker found
+ return e("expected marker","Corrupt JPEG");
+
+ case 0xC2: // SOF - progressive
+ return e("progressive jpeg","JPEG format not supported (progressive)");
+
+ case 0xDD: // DRI - specify restart interval
+ if (get16(z->s) != 4) return e("bad DRI len","Corrupt JPEG");
+ z->restart_interval = get16(z->s);
+ return 1;
+
+ case 0xDB: // DQT - define quantization table
+ L = get16(z->s)-2;
+ while (L > 0) {
+ int q = get8(z->s);
+ int p = q >> 4;
+ int t = q & 15,i;
+ if (p != 0) return e("bad DQT type","Corrupt JPEG");
+ if (t > 3) return e("bad DQT table","Corrupt JPEG");
+ for (i=0; i < 64; ++i)
+ z->dequant[t][dezigzag[i]] = get8u(z->s);
+ #ifdef STBI_SIMD
+ for (i=0; i < 64; ++i)
+ z->dequant2[t][i] = z->dequant[t][i];
+ #endif
+ L -= 65;
+ }
+ return L==0;
+
+ case 0xC4: // DHT - define huffman table
+ L = get16(z->s)-2;
+ while (L > 0) {
+ uint8 *v;
+ int sizes[16],i,m=0;
+ int q = get8(z->s);
+ int tc = q >> 4;
+ int th = q & 15;
+ if (tc > 1 || th > 3) return e("bad DHT header","Corrupt JPEG");
+ for (i=0; i < 16; ++i) {
+ sizes[i] = get8(z->s);
+ m += sizes[i];
+ }
+ L -= 17;
+ if (tc == 0) {
+ if (!build_huffman(z->huff_dc+th, sizes)) return 0;
+ v = z->huff_dc[th].values;
+ } else {
+ if (!build_huffman(z->huff_ac+th, sizes)) return 0;
+ v = z->huff_ac[th].values;
+ }
+ for (i=0; i < m; ++i)
+ v[i] = get8u(z->s);
+ L -= m;
+ }
+ return L==0;
+ }
+ // check for comment block or APP blocks
+ if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+ skip(z->s, get16(z->s)-2);
+ return 1;
+ }
+ return 0;
+}
+
+// after we see SOS
+static int process_scan_header(jpeg *z)
+{
+ int i;
+ int Ls = get16(z->s);
+ z->scan_n = get8(z->s);
+ if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return e("bad SOS component count","Corrupt JPEG");
+ if (Ls != 6+2*z->scan_n) return e("bad SOS len","Corrupt JPEG");
+ for (i=0; i < z->scan_n; ++i) {
+ int id = get8(z->s), which;
+ int q = get8(z->s);
+ for (which = 0; which < z->s->img_n; ++which)
+ if (z->img_comp[which].id == id)
+ break;
+ if (which == z->s->img_n) return 0;
+ z->img_comp[which].hd = q >> 4; if (z->img_comp[which].hd > 3) return e("bad DC huff","Corrupt JPEG");
+ z->img_comp[which].ha = q & 15; if (z->img_comp[which].ha > 3) return e("bad AC huff","Corrupt JPEG");
+ z->order[i] = which;
+ }
+ if (get8(z->s) != 0) return e("bad SOS","Corrupt JPEG");
+ get8(z->s); // should be 63, but might be 0
+ if (get8(z->s) != 0) return e("bad SOS","Corrupt JPEG");
+
+ return 1;
+}
+
+static int process_frame_header(jpeg *z, int scan)
+{
+ stbi *s = z->s;
+ int Lf,p,i,q, h_max=1,v_max=1,c;
+ Lf = get16(s); if (Lf < 11) return e("bad SOF len","Corrupt JPEG"); // JPEG
+ p = get8(s); if (p != 8) return e("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
+ s->img_y = get16(s); if (s->img_y == 0) return e("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
+ s->img_x = get16(s); if (s->img_x == 0) return e("0 width","Corrupt JPEG"); // JPEG requires
+ c = get8(s);
+ if (c != 3 && c != 1) return e("bad component count","Corrupt JPEG"); // JFIF requires
+ s->img_n = c;
+ for (i=0; i < c; ++i) {
+ z->img_comp[i].data = NULL;
+ z->img_comp[i].linebuf = NULL;
+ }
+
+ if (Lf != 8+3*s->img_n) return e("bad SOF len","Corrupt JPEG");
+
+ for (i=0; i < s->img_n; ++i) {
+ z->img_comp[i].id = get8(s);
+ if (z->img_comp[i].id != i+1) // JFIF requires
+ if (z->img_comp[i].id != i) // some version of jpegtran outputs non-JFIF-compliant files!
+ return e("bad component ID","Corrupt JPEG");
+ q = get8(s);
+ z->img_comp[i].h = (q >> 4); if (!z->img_comp[i].h || z->img_comp[i].h > 4) return e("bad H","Corrupt JPEG");
+ z->img_comp[i].v = q & 15; if (!z->img_comp[i].v || z->img_comp[i].v > 4) return e("bad V","Corrupt JPEG");
+ z->img_comp[i].tq = get8(s); if (z->img_comp[i].tq > 3) return e("bad TQ","Corrupt JPEG");
+ }
+
+ if (scan != SCAN_load) return 1;
+
+ if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode");
+
+ for (i=0; i < s->img_n; ++i) {
+ if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
+ if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
+ }
+
+ // compute interleaved mcu info
+ z->img_h_max = h_max;
+ z->img_v_max = v_max;
+ z->img_mcu_w = h_max * 8;
+ z->img_mcu_h = v_max * 8;
+ z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
+ z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
+
+ for (i=0; i < s->img_n; ++i) {
+ // number of effective pixels (e.g. for non-interleaved MCU)
+ z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
+ z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
+ // to simplify generation, we'll allocate enough memory to decode
+ // the bogus oversized data from using interleaved MCUs and their
+ // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+ // discard the extra data until colorspace conversion
+ z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+ z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+ z->img_comp[i].raw_data = malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15);
+ if (z->img_comp[i].raw_data == NULL) {
+ for(--i; i >= 0; --i) {
+ free(z->img_comp[i].raw_data);
+ z->img_comp[i].data = NULL;
+ }
+ return e("outofmem", "Out of memory");
+ }
+ // align blocks for installable-idct using mmx/sse
+ z->img_comp[i].data = (uint8*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
+ z->img_comp[i].linebuf = NULL;
+ }
+
+ return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define DNL(x) ((x) == 0xdc)
+#define SOI(x) ((x) == 0xd8)
+#define EOI(x) ((x) == 0xd9)
+#define SOF(x) ((x) == 0xc0 || (x) == 0xc1)
+#define SOS(x) ((x) == 0xda)
+
+static int decode_jpeg_header(jpeg *z, int scan)
+{
+ int m;
+ z->marker = MARKER_none; // initialize cached marker to empty
+ m = get_marker(z);
+ if (!SOI(m)) return e("no SOI","Corrupt JPEG");
+ if (scan == SCAN_type) return 1;
+ m = get_marker(z);
+ while (!SOF(m)) {
+ if (!process_marker(z,m)) return 0;
+ m = get_marker(z);
+ while (m == MARKER_none) {
+ // some files have extra padding after their blocks, so ok, we'll scan
+ if (at_eof(z->s)) return e("no SOF", "Corrupt JPEG");
+ m = get_marker(z);
+ }
+ }
+ if (!process_frame_header(z, scan)) return 0;
+ return 1;
+}
+
+static int decode_jpeg_image(jpeg *j)
+{
+ int m;
+ j->restart_interval = 0;
+ if (!decode_jpeg_header(j, SCAN_load)) return 0;
+ m = get_marker(j);
+ while (!EOI(m)) {
+ if (SOS(m)) {
+ if (!process_scan_header(j)) return 0;
+ if (!parse_entropy_coded_data(j)) return 0;
+ if (j->marker == MARKER_none ) {
+ // handle 0s at the end of image data from IP Kamera 9060
+ while (!at_eof(j->s)) {
+ int x = get8(j->s);
+ if (x == 255) {
+ j->marker = get8u(j->s);
+ break;
+ } else if (x != 0) {
+ return 0;
+ }
+ }
+ // if we reach eof without hitting a marker, get_marker() below will fail and we'll eventually return 0
+ }
+ } else {
+ if (!process_marker(j, m)) return 0;
+ }
+ m = get_marker(j);
+ }
+ return 1;
+}
+
+// static jfif-centered resampling (across block boundaries)
+
+typedef uint8 *(*resample_row_func)(uint8 *out, uint8 *in0, uint8 *in1,
+ int w, int hs);
+
+#define div4(x) ((uint8) ((x) >> 2))
+
+static uint8 *resample_row_1(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
+{
+ STBI_NOTUSED(out);
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(w);
+ STBI_NOTUSED(hs);
+ return in_near;
+}
+
+static uint8* resample_row_v_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
+{
+ // need to generate two samples vertically for every one in input
+ int i;
+ STBI_NOTUSED(hs);
+ for (i=0; i < w; ++i)
+ out[i] = div4(3*in_near[i] + in_far[i] + 2);
+ return out;
+}
+
+static uint8* resample_row_h_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
+{
+ // need to generate two samples horizontally for every one in input
+ int i;
+ uint8 *input = in_near;
+
+ if (w == 1) {
+ // if only one sample, can't do any interpolation
+ out[0] = out[1] = input[0];
+ return out;
+ }
+
+ out[0] = input[0];
+ out[1] = div4(input[0]*3 + input[1] + 2);
+ for (i=1; i < w-1; ++i) {
+ int n = 3*input[i]+2;
+ out[i*2+0] = div4(n+input[i-1]);
+ out[i*2+1] = div4(n+input[i+1]);
+ }
+ out[i*2+0] = div4(input[w-2]*3 + input[w-1] + 2);
+ out[i*2+1] = input[w-1];
+
+ STBI_NOTUSED(in_far);
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+
+#define div16(x) ((uint8) ((x) >> 4))
+
+static uint8 *resample_row_hv_2(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
+{
+ // need to generate 2x2 samples for every one in input
+ int i,t0,t1;
+ if (w == 1) {
+ out[0] = out[1] = div4(3*in_near[0] + in_far[0] + 2);
+ return out;
+ }
+
+ t1 = 3*in_near[0] + in_far[0];
+ out[0] = div4(t1+2);
+ for (i=1; i < w; ++i) {
+ t0 = t1;
+ t1 = 3*in_near[i]+in_far[i];
+ out[i*2-1] = div16(3*t0 + t1 + 8);
+ out[i*2 ] = div16(3*t1 + t0 + 8);
+ }
+ out[w*2-1] = div4(t1+2);
+
+ STBI_NOTUSED(hs);
+
+ return out;
+}
+
+static uint8 *resample_row_generic(uint8 *out, uint8 *in_near, uint8 *in_far, int w, int hs)
+{
+ // resample with nearest-neighbor
+ int i,j;
+ STBI_NOTUSED(in_far);
+ for (i=0; i < w; ++i)
+ for (j=0; j < hs; ++j)
+ out[i*hs+j] = in_near[i];
+ return out;
+}
+
+#define float2fixed(x) ((int) ((x) * 65536 + 0.5))
+
+// 0.38 seconds on 3*anemones.jpg (0.25 with processor = Pro)
+// VC6 without processor=Pro is generating multiple LEAs per multiply!
+static void YCbCr_to_RGB_row(uint8 *out, const uint8 *y, const uint8 *pcb, const uint8 *pcr, int count, int step)
+{
+ int i;
+ for (i=0; i < count; ++i) {
+ int y_fixed = (y[i] << 16) + 32768; // rounding
+ int r,g,b;
+ int cr = pcr[i] - 128;
+ int cb = pcb[i] - 128;
+ r = y_fixed + cr*float2fixed(1.40200f);
+ g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f);
+ b = y_fixed + cb*float2fixed(1.77200f);
+ r >>= 16;
+ g >>= 16;
+ b >>= 16;
+ if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+ if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+ if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+ out[0] = (uint8)r;
+ out[1] = (uint8)g;
+ out[2] = (uint8)b;
+ out[3] = 255;
+ out += step;
+ }
+}
+
+#ifdef STBI_SIMD
+static stbi_YCbCr_to_RGB_run stbi_YCbCr_installed = YCbCr_to_RGB_row;
+
+void stbi_install_YCbCr_to_RGB(stbi_YCbCr_to_RGB_run func)
+{
+ stbi_YCbCr_installed = func;
+}
+#endif
+
+
+// clean up the temporary component buffers
+static void cleanup_jpeg(jpeg *j)
+{
+ int i;
+ for (i=0; i < j->s->img_n; ++i) {
+ if (j->img_comp[i].data) {
+ free(j->img_comp[i].raw_data);
+ j->img_comp[i].data = NULL;
+ }
+ if (j->img_comp[i].linebuf) {
+ free(j->img_comp[i].linebuf);
+ j->img_comp[i].linebuf = NULL;
+ }
+ }
+}
+
+typedef struct
+{
+ resample_row_func resample;
+ uint8 *line0,*line1;
+ int hs,vs; // expansion factor in each axis
+ int w_lores; // horizontal pixels pre-expansion
+ int ystep; // how far through vertical expansion we are
+ int ypos; // which pre-expansion row we're on
+} stbi_resample;
+
+static uint8 *load_jpeg_image(jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
+{
+ int n, decode_n;
+ // validate req_comp
+ if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
+ z->s->img_n = 0;
+
+ // load a jpeg image from whichever source
+ if (!decode_jpeg_image(z)) { cleanup_jpeg(z); return NULL; }
+
+ // determine actual number of components to generate
+ n = req_comp ? req_comp : z->s->img_n;
+
+ if (z->s->img_n == 3 && n < 3)
+ decode_n = 1;
+ else
+ decode_n = z->s->img_n;
+
+ // resample and color-convert
+ {
+ int k;
+ uint i,j;
+ uint8 *output;
+ uint8 *coutput[4];
+
+ stbi_resample res_comp[4];
+
+ for (k=0; k < decode_n; ++k) {
+ stbi_resample *r = &res_comp[k];
+
+ // allocate line buffer big enough for upsampling off the edges
+ // with upsample factor of 4
+ z->img_comp[k].linebuf = (uint8 *) malloc(z->s->img_x + 3);
+ if (!z->img_comp[k].linebuf) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); }
+
+ r->hs = z->img_h_max / z->img_comp[k].h;
+ r->vs = z->img_v_max / z->img_comp[k].v;
+ r->ystep = r->vs >> 1;
+ r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
+ r->ypos = 0;
+ r->line0 = r->line1 = z->img_comp[k].data;
+
+ if (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
+ else if (r->hs == 1 && r->vs == 2) r->resample = resample_row_v_2;
+ else if (r->hs == 2 && r->vs == 1) r->resample = resample_row_h_2;
+ else if (r->hs == 2 && r->vs == 2) r->resample = resample_row_hv_2;
+ else r->resample = resample_row_generic;
+ }
+
+ // can't error after this so, this is safe
+ output = (uint8 *) malloc(n * z->s->img_x * z->s->img_y + 1);
+ if (!output) { cleanup_jpeg(z); return epuc("outofmem", "Out of memory"); }
+
+ // now go ahead and resample
+ for (j=0; j < z->s->img_y; ++j) {
+ uint8 *out = output + n * z->s->img_x * j;
+ for (k=0; k < decode_n; ++k) {
+ stbi_resample *r = &res_comp[k];
+ int y_bot = r->ystep >= (r->vs >> 1);
+ coutput[k] = r->resample(z->img_comp[k].linebuf,
+ y_bot ? r->line1 : r->line0,
+ y_bot ? r->line0 : r->line1,
+ r->w_lores, r->hs);
+ if (++r->ystep >= r->vs) {
+ r->ystep = 0;
+ r->line0 = r->line1;
+ if (++r->ypos < z->img_comp[k].y)
+ r->line1 += z->img_comp[k].w2;
+ }
+ }
+ if (n >= 3) {
+ uint8 *y = coutput[0];
+ if (z->s->img_n == 3) {
+ #ifdef STBI_SIMD
+ stbi_YCbCr_installed(out, y, coutput[1], coutput[2], z->s.img_x, n);
+ #else
+ YCbCr_to_RGB_row(out, y, coutput[1], coutput[2], z->s->img_x, n);
+ #endif
+ } else
+ for (i=0; i < z->s->img_x; ++i) {
+ out[0] = out[1] = out[2] = y[i];
+ out[3] = 255; // not used if n==3
+ out += n;
+ }
+ } else {
+ uint8 *y = coutput[0];
+ if (n == 1)
+ for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
+ else
+ for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255;
+ }
+ }
+ cleanup_jpeg(z);
+ *out_x = z->s->img_x;
+ *out_y = z->s->img_y;
+ if (comp) *comp = z->s->img_n; // report original components, not output
+ return output;
+ }
+}
+
+static unsigned char *stbi_jpeg_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ jpeg j;
+ j.s = s;
+ return load_jpeg_image(&j, x,y,comp,req_comp);
+}
+
+static int stbi_jpeg_test(stbi *s)
+{
+ int r;
+ jpeg j;
+ j.s = s;
+ r = decode_jpeg_header(&j, SCAN_type);
+ stbi_rewind(s);
+ return r;
+}
+
+static int stbi_jpeg_info_raw(jpeg *j, int *x, int *y, int *comp)
+{
+ if (!decode_jpeg_header(j, SCAN_header)) {
+ stbi_rewind( j->s );
+ return 0;
+ }
+ if (x) *x = j->s->img_x;
+ if (y) *y = j->s->img_y;
+ if (comp) *comp = j->s->img_n;
+ return 1;
+}
+
+static int stbi_jpeg_info(stbi *s, int *x, int *y, int *comp)
+{
+ jpeg j;
+ j.s = s;
+ return stbi_jpeg_info_raw(&j, x, y, comp);
+}
+
+// public domain zlib decode v0.2 Sean Barrett 2006-11-18
+// simple implementation
+// - all input must be provided in an upfront buffer
+// - all output is written to a single output buffer (can malloc/realloc)
+// performance
+// - fast huffman
+
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define ZFAST_BITS 9 // accelerate all cases in default tables
+#define ZFAST_MASK ((1 << ZFAST_BITS) - 1)
+
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct
+{
+ uint16 fast[1 << ZFAST_BITS];
+ uint16 firstcode[16];
+ int maxcode[17];
+ uint16 firstsymbol[16];
+ uint8 size[288];
+ uint16 value[288];
+} zhuffman;
+
+stbi_inline static int bitreverse16(int n)
+{
+ n = ((n & 0xAAAA) >> 1) | ((n & 0x5555) << 1);
+ n = ((n & 0xCCCC) >> 2) | ((n & 0x3333) << 2);
+ n = ((n & 0xF0F0) >> 4) | ((n & 0x0F0F) << 4);
+ n = ((n & 0xFF00) >> 8) | ((n & 0x00FF) << 8);
+ return n;
+}
+
+stbi_inline static int bit_reverse(int v, int bits)
+{
+ assert(bits <= 16);
+ // to bit reverse n bits, reverse 16 and shift
+ // e.g. 11 bits, bit reverse and shift away 5
+ return bitreverse16(v) >> (16-bits);
+}
+
+static int zbuild_huffman(zhuffman *z, uint8 *sizelist, int num)
+{
+ int i,k=0;
+ int code, next_code[16], sizes[17];
+
+ // DEFLATE spec for generating codes
+ memset(sizes, 0, sizeof(sizes));
+ memset(z->fast, 255, sizeof(z->fast));
+ for (i=0; i < num; ++i)
+ ++sizes[sizelist[i]];
+ sizes[0] = 0;
+ for (i=1; i < 16; ++i)
+ assert(sizes[i] <= (1 << i));
+ code = 0;
+ for (i=1; i < 16; ++i) {
+ next_code[i] = code;
+ z->firstcode[i] = (uint16) code;
+ z->firstsymbol[i] = (uint16) k;
+ code = (code + sizes[i]);
+ if (sizes[i])
+ if (code-1 >= (1 << i)) return e("bad codelengths","Corrupt JPEG");
+ z->maxcode[i] = code << (16-i); // preshift for inner loop
+ code <<= 1;
+ k += sizes[i];
+ }
+ z->maxcode[16] = 0x10000; // sentinel
+ for (i=0; i < num; ++i) {
+ int s = sizelist[i];
+ if (s) {
+ int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+ z->size[c] = (uint8)s;
+ z->value[c] = (uint16)i;
+ if (s <= ZFAST_BITS) {
+ int k = bit_reverse(next_code[s],s);
+ while (k < (1 << ZFAST_BITS)) {
+ z->fast[k] = (uint16) c;
+ k += (1 << s);
+ }
+ }
+ ++next_code[s];
+ }
+ }
+ return 1;
+}
+
+// zlib-from-memory implementation for PNG reading
+// because PNG allows splitting the zlib stream arbitrarily,
+// and it's annoying structurally to have PNG call ZLIB call PNG,
+// we require PNG read all the IDATs and combine them into a single
+// memory buffer
+
+typedef struct
+{
+ uint8 *zbuffer, *zbuffer_end;
+ int num_bits;
+ uint32 code_buffer;
+
+ char *zout;
+ char *zout_start;
+ char *zout_end;
+ int z_expandable;
+
+ zhuffman z_length, z_distance;
+} zbuf;
+
+stbi_inline static int zget8(zbuf *z)
+{
+ if (z->zbuffer >= z->zbuffer_end) return 0;
+ return *z->zbuffer++;
+}
+
+static void fill_bits(zbuf *z)
+{
+ do {
+ assert(z->code_buffer < (1U << z->num_bits));
+ z->code_buffer |= zget8(z) << z->num_bits;
+ z->num_bits += 8;
+ } while (z->num_bits <= 24);
+}
+
+stbi_inline static unsigned int zreceive(zbuf *z, int n)
+{
+ unsigned int k;
+ if (z->num_bits < n) fill_bits(z);
+ k = z->code_buffer & ((1 << n) - 1);
+ z->code_buffer >>= n;
+ z->num_bits -= n;
+ return k;
+}
+
+stbi_inline static int zhuffman_decode(zbuf *a, zhuffman *z)
+{
+ int b,s,k;
+ if (a->num_bits < 16) fill_bits(a);
+ b = z->fast[a->code_buffer & ZFAST_MASK];
+ if (b < 0xffff) {
+ s = z->size[b];
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return z->value[b];
+ }
+
+ // not resolved by fast table, so compute it the slow way
+ // use jpeg approach, which requires MSbits at top
+ k = bit_reverse(a->code_buffer, 16);
+ for (s=ZFAST_BITS+1; ; ++s)
+ if (k < z->maxcode[s])
+ break;
+ if (s == 16) return -1; // invalid code!
+ // code size is s, so:
+ b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
+ assert(z->size[b] == s);
+ a->code_buffer >>= s;
+ a->num_bits -= s;
+ return z->value[b];
+}
+
+static int expand(zbuf *z, int n) // need to make room for n bytes
+{
+ char *q;
+ int cur, limit;
+ if (!z->z_expandable) return e("output buffer limit","Corrupt PNG");
+ cur = (int) (z->zout - z->zout_start);
+ limit = (int) (z->zout_end - z->zout_start);
+ while (cur + n > limit)
+ limit *= 2;
+ q = (char *) realloc(z->zout_start, limit);
+ if (q == NULL) return e("outofmem", "Out of memory");
+ z->zout_start = q;
+ z->zout = q + cur;
+ z->zout_end = q + limit;
+ return 1;
+}
+
+static int length_base[31] = {
+ 3,4,5,6,7,8,9,10,11,13,
+ 15,17,19,23,27,31,35,43,51,59,
+ 67,83,99,115,131,163,195,227,258,0,0 };
+
+static int length_extra[31]=
+{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+
+static int dist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
+257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+
+static int dist_extra[32] =
+{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+
+static int parse_huffman_block(zbuf *a)
+{
+ for(;;) {
+ int z = zhuffman_decode(a, &a->z_length);
+ if (z < 256) {
+ if (z < 0) return e("bad huffman code","Corrupt PNG"); // error in huffman codes
+ if (a->zout >= a->zout_end) if (!expand(a, 1)) return 0;
+ *a->zout++ = (char) z;
+ } else {
+ uint8 *p;
+ int len,dist;
+ if (z == 256) return 1;
+ z -= 257;
+ len = length_base[z];
+ if (length_extra[z]) len += zreceive(a, length_extra[z]);
+ z = zhuffman_decode(a, &a->z_distance);
+ if (z < 0) return e("bad huffman code","Corrupt PNG");
+ dist = dist_base[z];
+ if (dist_extra[z]) dist += zreceive(a, dist_extra[z]);
+ if (a->zout - a->zout_start < dist) return e("bad dist","Corrupt PNG");
+ if (a->zout + len > a->zout_end) if (!expand(a, len)) return 0;
+ p = (uint8 *) (a->zout - dist);
+ while (len--)
+ *a->zout++ = *p++;
+ }
+ }
+}
+
+static int compute_huffman_codes(zbuf *a)
+{
+ static uint8 length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
+ zhuffman z_codelength;
+ uint8 lencodes[286+32+137];//padding for maximum single op
+ uint8 codelength_sizes[19];
+ int i,n;
+
+ int hlit = zreceive(a,5) + 257;
+ int hdist = zreceive(a,5) + 1;
+ int hclen = zreceive(a,4) + 4;
+
+ memset(codelength_sizes, 0, sizeof(codelength_sizes));
+ for (i=0; i < hclen; ++i) {
+ int s = zreceive(a,3);
+ codelength_sizes[length_dezigzag[i]] = (uint8) s;
+ }
+ if (!zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
+
+ n = 0;
+ while (n < hlit + hdist) {
+ int c = zhuffman_decode(a, &z_codelength);
+ assert(c >= 0 && c < 19);
+ if (c < 16)
+ lencodes[n++] = (uint8) c;
+ else if (c == 16) {
+ c = zreceive(a,2)+3;
+ memset(lencodes+n, lencodes[n-1], c);
+ n += c;
+ } else if (c == 17) {
+ c = zreceive(a,3)+3;
+ memset(lencodes+n, 0, c);
+ n += c;
+ } else {
+ assert(c == 18);
+ c = zreceive(a,7)+11;
+ memset(lencodes+n, 0, c);
+ n += c;
+ }
+ }
+ if (n != hlit+hdist) return e("bad codelengths","Corrupt PNG");
+ if (!zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
+ if (!zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
+ return 1;
+}
+
+static int parse_uncompressed_block(zbuf *a)
+{
+ uint8 header[4];
+ int len,nlen,k;
+ if (a->num_bits & 7)
+ zreceive(a, a->num_bits & 7); // discard
+ // drain the bit-packed data into header
+ k = 0;
+ while (a->num_bits > 0) {
+ header[k++] = (uint8) (a->code_buffer & 255); // wtf this warns?
+ a->code_buffer >>= 8;
+ a->num_bits -= 8;
+ }
+ assert(a->num_bits == 0);
+ // now fill header the normal way
+ while (k < 4)
+ header[k++] = (uint8) zget8(a);
+ len = header[1] * 256 + header[0];
+ nlen = header[3] * 256 + header[2];
+ if (nlen != (len ^ 0xffff)) return e("zlib corrupt","Corrupt PNG");
+ if (a->zbuffer + len > a->zbuffer_end) return e("read past buffer","Corrupt PNG");
+ if (a->zout + len > a->zout_end)
+ if (!expand(a, len)) return 0;
+ memcpy(a->zout, a->zbuffer, len);
+ a->zbuffer += len;
+ a->zout += len;
+ return 1;
+}
+
+static int parse_zlib_header(zbuf *a)
+{
+ int cmf = zget8(a);
+ int cm = cmf & 15;
+ /* int cinfo = cmf >> 4; */
+ int flg = zget8(a);
+ if ((cmf*256+flg) % 31 != 0) return e("bad zlib header","Corrupt PNG"); // zlib spec
+ if (flg & 32) return e("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
+ if (cm != 8) return e("bad compression","Corrupt PNG"); // DEFLATE required for png
+ // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+ return 1;
+}
+
+// @TODO: should statically initialize these for optimal thread safety
+static uint8 default_length[288], default_distance[32];
+static void init_defaults(void)
+{
+ int i; // use <= to match clearly with spec
+ for (i=0; i <= 143; ++i) default_length[i] = 8;
+ for ( ; i <= 255; ++i) default_length[i] = 9;
+ for ( ; i <= 279; ++i) default_length[i] = 7;
+ for ( ; i <= 287; ++i) default_length[i] = 8;
+
+ for (i=0; i <= 31; ++i) default_distance[i] = 5;
+}
+
+int stbi_png_partial; // a quick hack to only allow decoding some of a PNG... I should implement real streaming support instead
+static int parse_zlib(zbuf *a, int parse_header)
+{
+ int final, type;
+ if (parse_header)
+ if (!parse_zlib_header(a)) return 0;
+ a->num_bits = 0;
+ a->code_buffer = 0;
+ do {
+ final = zreceive(a,1);
+ type = zreceive(a,2);
+ if (type == 0) {
+ if (!parse_uncompressed_block(a)) return 0;
+ } else if (type == 3) {
+ return 0;
+ } else {
+ if (type == 1) {
+ // use fixed code lengths
+ if (!default_distance[31]) init_defaults();
+ if (!zbuild_huffman(&a->z_length , default_length , 288)) return 0;
+ if (!zbuild_huffman(&a->z_distance, default_distance, 32)) return 0;
+ } else {
+ if (!compute_huffman_codes(a)) return 0;
+ }
+ if (!parse_huffman_block(a)) return 0;
+ }
+ if (stbi_png_partial && a->zout - a->zout_start > 65536)
+ break;
+ } while (!final);
+ return 1;
+}
+
+static int do_zlib(zbuf *a, char *obuf, int olen, int exp, int parse_header)
+{
+ a->zout_start = obuf;
+ a->zout = obuf;
+ a->zout_end = obuf + olen;
+ a->z_expandable = exp;
+
+ return parse_zlib(a, parse_header);
+}
+
+char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
+{
+ zbuf a;
+ char *p = (char *) malloc(initial_size);
+ if (p == NULL) return NULL;
+ a.zbuffer = (uint8 *) buffer;
+ a.zbuffer_end = (uint8 *) buffer + len;
+ if (do_zlib(&a, p, initial_size, 1, 1)) {
+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ free(a.zout_start);
+ return NULL;
+ }
+}
+
+char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
+{
+ return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+
+char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
+{
+ zbuf a;
+ char *p = (char *) malloc(initial_size);
+ if (p == NULL) return NULL;
+ a.zbuffer = (uint8 *) buffer;
+ a.zbuffer_end = (uint8 *) buffer + len;
+ if (do_zlib(&a, p, initial_size, 1, parse_header)) {
+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ free(a.zout_start);
+ return NULL;
+ }
+}
+
+int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
+{
+ zbuf a;
+ a.zbuffer = (uint8 *) ibuffer;
+ a.zbuffer_end = (uint8 *) ibuffer + ilen;
+ if (do_zlib(&a, obuffer, olen, 0, 1))
+ return (int) (a.zout - a.zout_start);
+ else
+ return -1;
+}
+
+char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
+{
+ zbuf a;
+ char *p = (char *) malloc(16384);
+ if (p == NULL) return NULL;
+ a.zbuffer = (uint8 *) buffer;
+ a.zbuffer_end = (uint8 *) buffer+len;
+ if (do_zlib(&a, p, 16384, 1, 0)) {
+ if (outlen) *outlen = (int) (a.zout - a.zout_start);
+ return a.zout_start;
+ } else {
+ free(a.zout_start);
+ return NULL;
+ }
+}
+
+int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
+{
+ zbuf a;
+ a.zbuffer = (uint8 *) ibuffer;
+ a.zbuffer_end = (uint8 *) ibuffer + ilen;
+ if (do_zlib(&a, obuffer, olen, 0, 0))
+ return (int) (a.zout - a.zout_start);
+ else
+ return -1;
+}
+
+// public domain "baseline" PNG decoder v0.10 Sean Barrett 2006-11-18
+// simple implementation
+// - only 8-bit samples
+// - no CRC checking
+// - allocates lots of intermediate memory
+// - avoids problem of streaming data between subsystems
+// - avoids explicit window management
+// performance
+// - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+
+
+typedef struct
+{
+ uint32 length;
+ uint32 type;
+} chunk;
+
+#define PNG_TYPE(a,b,c,d) (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+
+static chunk get_chunk_header(stbi *s)
+{
+ chunk c;
+ c.length = get32(s);
+ c.type = get32(s);
+ return c;
+}
+
+static int check_png_header(stbi *s)
+{
+ static uint8 png_sig[8] = { 137,80,78,71,13,10,26,10 };
+ int i;
+ for (i=0; i < 8; ++i)
+ if (get8u(s) != png_sig[i]) return e("bad png sig","Not a PNG");
+ return 1;
+}
+
+typedef struct
+{
+ stbi *s;
+ uint8 *idata, *expanded, *out;
+} png;
+
+
+enum {
+ F_none=0, F_sub=1, F_up=2, F_avg=3, F_paeth=4,
+ F_avg_first, F_paeth_first
+};
+
+static uint8 first_row_filter[5] =
+{
+ F_none, F_sub, F_none, F_avg_first, F_paeth_first
+};
+
+static int paeth(int a, int b, int c)
+{
+ int p = a + b - c;
+ int pa = abs(p-a);
+ int pb = abs(p-b);
+ int pc = abs(p-c);
+ if (pa <= pb && pa <= pc) return a;
+ if (pb <= pc) return b;
+ return c;
+}
+
+// create the png data from post-deflated data
+static int create_png_image_raw(png *a, uint8 *raw, uint32 raw_len, int out_n, uint32 x, uint32 y)
+{
+ stbi *s = a->s;
+ uint32 i,j,stride = x*out_n;
+ int k;
+ int img_n = s->img_n; // copy it into a local for later
+ assert(out_n == s->img_n || out_n == s->img_n+1);
+ if (stbi_png_partial) y = 1;
+ a->out = (uint8 *) malloc(x * y * out_n);
+ if (!a->out) return e("outofmem", "Out of memory");
+ if (!stbi_png_partial) {
+ if (s->img_x == x && s->img_y == y) {
+ if (raw_len != (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG");
+ } else { // interlaced:
+ if (raw_len < (img_n * x + 1) * y) return e("not enough pixels","Corrupt PNG");
+ }
+ }
+ for (j=0; j < y; ++j) {
+ uint8 *cur = a->out + stride*j;
+ uint8 *prior = cur - stride;
+ int filter = *raw++;
+ if (filter > 4) return e("invalid filter","Corrupt PNG");
+ // if first row, use special filter that doesn't sample previous row
+ if (j == 0) filter = first_row_filter[filter];
+ // handle first pixel explicitly
+ for (k=0; k < img_n; ++k) {
+ switch (filter) {
+ case F_none : cur[k] = raw[k]; break;
+ case F_sub : cur[k] = raw[k]; break;
+ case F_up : cur[k] = raw[k] + prior[k]; break;
+ case F_avg : cur[k] = raw[k] + (prior[k]>>1); break;
+ case F_paeth : cur[k] = (uint8) (raw[k] + paeth(0,prior[k],0)); break;
+ case F_avg_first : cur[k] = raw[k]; break;
+ case F_paeth_first: cur[k] = raw[k]; break;
+ }
+ }
+ if (img_n != out_n) cur[img_n] = 255;
+ raw += img_n;
+ cur += out_n;
+ prior += out_n;
+ // this is a little gross, so that we don't switch per-pixel or per-component
+ if (img_n == out_n) {
+ #define CASE(f) \
+ case f: \
+ for (i=x-1; i >= 1; --i, raw+=img_n,cur+=img_n,prior+=img_n) \
+ for (k=0; k < img_n; ++k)
+ switch (filter) {
+ CASE(F_none) cur[k] = raw[k]; break;
+ CASE(F_sub) cur[k] = raw[k] + cur[k-img_n]; break;
+ CASE(F_up) cur[k] = raw[k] + prior[k]; break;
+ CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-img_n])>>1); break;
+ CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],prior[k],prior[k-img_n])); break;
+ CASE(F_avg_first) cur[k] = raw[k] + (cur[k-img_n] >> 1); break;
+ CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-img_n],0,0)); break;
+ }
+ #undef CASE
+ } else {
+ assert(img_n+1 == out_n);
+ #define CASE(f) \
+ case f: \
+ for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \
+ for (k=0; k < img_n; ++k)
+ switch (filter) {
+ CASE(F_none) cur[k] = raw[k]; break;
+ CASE(F_sub) cur[k] = raw[k] + cur[k-out_n]; break;
+ CASE(F_up) cur[k] = raw[k] + prior[k]; break;
+ CASE(F_avg) cur[k] = raw[k] + ((prior[k] + cur[k-out_n])>>1); break;
+ CASE(F_paeth) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],prior[k],prior[k-out_n])); break;
+ CASE(F_avg_first) cur[k] = raw[k] + (cur[k-out_n] >> 1); break;
+ CASE(F_paeth_first) cur[k] = (uint8) (raw[k] + paeth(cur[k-out_n],0,0)); break;
+ }
+ #undef CASE
+ }
+ }
+ return 1;
+}
+
+static int create_png_image(png *a, uint8 *raw, uint32 raw_len, int out_n, int interlaced)
+{
+ uint8 *final;
+ int p;
+ int save;
+ if (!interlaced)
+ return create_png_image_raw(a, raw, raw_len, out_n, a->s->img_x, a->s->img_y);
+ save = stbi_png_partial;
+ stbi_png_partial = 0;
+
+ // de-interlacing
+ final = (uint8 *) malloc(a->s->img_x * a->s->img_y * out_n);
+ for (p=0; p < 7; ++p) {
+ int xorig[] = { 0,4,0,2,0,1,0 };
+ int yorig[] = { 0,0,4,0,2,0,1 };
+ int xspc[] = { 8,8,4,4,2,2,1 };
+ int yspc[] = { 8,8,8,4,4,2,2 };
+ int i,j,x,y;
+ // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+ x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
+ y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
+ if (x && y) {
+ if (!create_png_image_raw(a, raw, raw_len, out_n, x, y)) {
+ free(final);
+ return 0;
+ }
+ for (j=0; j < y; ++j)
+ for (i=0; i < x; ++i)
+ memcpy(final + (j*yspc[p]+yorig[p])*a->s->img_x*out_n + (i*xspc[p]+xorig[p])*out_n,
+ a->out + (j*x+i)*out_n, out_n);
+ free(a->out);
+ raw += (x*out_n+1)*y;
+ raw_len -= (x*out_n+1)*y;
+ }
+ }
+ a->out = final;
+
+ stbi_png_partial = save;
+ return 1;
+}
+
+static int compute_transparency(png *z, uint8 tc[3], int out_n)
+{
+ stbi *s = z->s;
+ uint32 i, pixel_count = s->img_x * s->img_y;
+ uint8 *p = z->out;
+
+ // compute color-based transparency, assuming we've
+ // already got 255 as the alpha value in the output
+ assert(out_n == 2 || out_n == 4);
+
+ if (out_n == 2) {
+ for (i=0; i < pixel_count; ++i) {
+ p[1] = (p[0] == tc[0] ? 0 : 255);
+ p += 2;
+ }
+ } else {
+ for (i=0; i < pixel_count; ++i) {
+ if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+ p[3] = 0;
+ p += 4;
+ }
+ }
+ return 1;
+}
+
+static int expand_palette(png *a, uint8 *palette, int len, int pal_img_n)
+{
+ uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+ uint8 *p, *temp_out, *orig = a->out;
+
+ p = (uint8 *) malloc(pixel_count * pal_img_n);
+ if (p == NULL) return e("outofmem", "Out of memory");
+
+ // between here and free(out) below, exitting would leak
+ temp_out = p;
+
+ if (pal_img_n == 3) {
+ for (i=0; i < pixel_count; ++i) {
+ int n = orig[i]*4;
+ p[0] = palette[n ];
+ p[1] = palette[n+1];
+ p[2] = palette[n+2];
+ p += 3;
+ }
+ } else {
+ for (i=0; i < pixel_count; ++i) {
+ int n = orig[i]*4;
+ p[0] = palette[n ];
+ p[1] = palette[n+1];
+ p[2] = palette[n+2];
+ p[3] = palette[n+3];
+ p += 4;
+ }
+ }
+ free(a->out);
+ a->out = temp_out;
+
+ STBI_NOTUSED(len);
+
+ return 1;
+}
+
+static int stbi_unpremultiply_on_load = 0;
+static int stbi_de_iphone_flag = 0;
+
+void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
+{
+ stbi_unpremultiply_on_load = flag_true_if_should_unpremultiply;
+}
+void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
+{
+ stbi_de_iphone_flag = flag_true_if_should_convert;
+}
+
+static void stbi_de_iphone(png *z)
+{
+ stbi *s = z->s;
+ uint32 i, pixel_count = s->img_x * s->img_y;
+ uint8 *p = z->out;
+
+ if (s->img_out_n == 3) { // convert bgr to rgb
+ for (i=0; i < pixel_count; ++i) {
+ uint8 t = p[0];
+ p[0] = p[2];
+ p[2] = t;
+ p += 3;
+ }
+ } else {
+ assert(s->img_out_n == 4);
+ if (stbi_unpremultiply_on_load) {
+ // convert bgr to rgb and unpremultiply
+ for (i=0; i < pixel_count; ++i) {
+ uint8 a = p[3];
+ uint8 t = p[0];
+ if (a) {
+ p[0] = p[2] * 255 / a;
+ p[1] = p[1] * 255 / a;
+ p[2] = t * 255 / a;
+ } else {
+ p[0] = p[2];
+ p[2] = t;
+ }
+ p += 4;
+ }
+ } else {
+ // convert bgr to rgb
+ for (i=0; i < pixel_count; ++i) {
+ uint8 t = p[0];
+ p[0] = p[2];
+ p[2] = t;
+ p += 4;
+ }
+ }
+ }
+}
+
+static int parse_png_file(png *z, int scan, int req_comp)
+{
+ uint8 palette[1024], pal_img_n=0;
+ uint8 has_trans=0, tc[3];
+ uint32 ioff=0, idata_limit=0, i, pal_len=0;
+ int first=1,k,interlace=0, iphone=0;
+ stbi *s = z->s;
+
+ z->expanded = NULL;
+ z->idata = NULL;
+ z->out = NULL;
+
+ if (!check_png_header(s)) return 0;
+
+ if (scan == SCAN_type) return 1;
+
+ for (;;) {
+ chunk c = get_chunk_header(s);
+ switch (c.type) {
+ case PNG_TYPE('C','g','B','I'):
+ iphone = stbi_de_iphone_flag;
+ skip(s, c.length);
+ break;
+ case PNG_TYPE('I','H','D','R'): {
+ int depth,color,comp,filter;
+ if (!first) return e("multiple IHDR","Corrupt PNG");
+ first = 0;
+ if (c.length != 13) return e("bad IHDR len","Corrupt PNG");
+ s->img_x = get32(s); if (s->img_x > (1 << 24)) return e("too large","Very large image (corrupt?)");
+ s->img_y = get32(s); if (s->img_y > (1 << 24)) return e("too large","Very large image (corrupt?)");
+ depth = get8(s); if (depth != 8) return e("8bit only","PNG not supported: 8-bit only");
+ color = get8(s); if (color > 6) return e("bad ctype","Corrupt PNG");
+ if (color == 3) pal_img_n = 3; else if (color & 1) return e("bad ctype","Corrupt PNG");
+ comp = get8(s); if (comp) return e("bad comp method","Corrupt PNG");
+ filter= get8(s); if (filter) return e("bad filter method","Corrupt PNG");
+ interlace = get8(s); if (interlace>1) return e("bad interlace method","Corrupt PNG");
+ if (!s->img_x || !s->img_y) return e("0-pixel image","Corrupt PNG");
+ if (!pal_img_n) {
+ s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+ if ((1 << 30) / s->img_x / s->img_n < s->img_y) return e("too large", "Image too large to decode");
+ if (scan == SCAN_header) return 1;
+ } else {
+ // if paletted, then pal_n is our final components, and
+ // img_n is # components to decompress/filter.
+ s->img_n = 1;
+ if ((1 << 30) / s->img_x / 4 < s->img_y) return e("too large","Corrupt PNG");
+ // if SCAN_header, have to scan to see if we have a tRNS
+ }
+ break;
+ }
+
+ case PNG_TYPE('P','L','T','E'): {
+ if (first) return e("first not IHDR", "Corrupt PNG");
+ if (c.length > 256*3) return e("invalid PLTE","Corrupt PNG");
+ pal_len = c.length / 3;
+ if (pal_len * 3 != c.length) return e("invalid PLTE","Corrupt PNG");
+ for (i=0; i < pal_len; ++i) {
+ palette[i*4+0] = get8u(s);
+ palette[i*4+1] = get8u(s);
+ palette[i*4+2] = get8u(s);
+ palette[i*4+3] = 255;
+ }
+ break;
+ }
+
+ case PNG_TYPE('t','R','N','S'): {
+ if (first) return e("first not IHDR", "Corrupt PNG");
+ if (z->idata) return e("tRNS after IDAT","Corrupt PNG");
+ if (pal_img_n) {
+ if (scan == SCAN_header) { s->img_n = 4; return 1; }
+ if (pal_len == 0) return e("tRNS before PLTE","Corrupt PNG");
+ if (c.length > pal_len) return e("bad tRNS len","Corrupt PNG");
+ pal_img_n = 4;
+ for (i=0; i < c.length; ++i)
+ palette[i*4+3] = get8u(s);
+ } else {
+ if (!(s->img_n & 1)) return e("tRNS with alpha","Corrupt PNG");
+ if (c.length != (uint32) s->img_n*2) return e("bad tRNS len","Corrupt PNG");
+ has_trans = 1;
+ for (k=0; k < s->img_n; ++k)
+ tc[k] = (uint8) get16(s); // non 8-bit images will be larger
+ }
+ break;
+ }
+
+ case PNG_TYPE('I','D','A','T'): {
+ if (first) return e("first not IHDR", "Corrupt PNG");
+ if (pal_img_n && !pal_len) return e("no PLTE","Corrupt PNG");
+ if (scan == SCAN_header) { s->img_n = pal_img_n; return 1; }
+ if (ioff + c.length > idata_limit) {
+ uint8 *p;
+ if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
+ while (ioff + c.length > idata_limit)
+ idata_limit *= 2;
+ p = (uint8 *) realloc(z->idata, idata_limit); if (p == NULL) return e("outofmem", "Out of memory");
+ z->idata = p;
+ }
+ if (!getn(s, z->idata+ioff,c.length)) return e("outofdata","Corrupt PNG");
+ ioff += c.length;
+ break;
+ }
+
+ case PNG_TYPE('I','E','N','D'): {
+ uint32 raw_len;
+ if (first) return e("first not IHDR", "Corrupt PNG");
+ if (scan != SCAN_load) return 1;
+ if (z->idata == NULL) return e("no IDAT","Corrupt PNG");
+ z->expanded = (uint8 *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, 16384, (int *) &raw_len, !iphone);
+ if (z->expanded == NULL) return 0; // zlib should set error
+ free(z->idata); z->idata = NULL;
+ if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
+ s->img_out_n = s->img_n+1;
+ else
+ s->img_out_n = s->img_n;
+ if (!create_png_image(z, z->expanded, raw_len, s->img_out_n, interlace)) return 0;
+ if (has_trans)
+ if (!compute_transparency(z, tc, s->img_out_n)) return 0;
+ if (iphone && s->img_out_n > 2)
+ stbi_de_iphone(z);
+ if (pal_img_n) {
+ // pal_img_n == 3 or 4
+ s->img_n = pal_img_n; // record the actual colors we had
+ s->img_out_n = pal_img_n;
+ if (req_comp >= 3) s->img_out_n = req_comp;
+ if (!expand_palette(z, palette, pal_len, s->img_out_n))
+ return 0;
+ }
+ free(z->expanded); z->expanded = NULL;
+ return 1;
+ }
+
+ default:
+ // if critical, fail
+ if (first) return e("first not IHDR", "Corrupt PNG");
+ if ((c.type & (1 << 29)) == 0) {
+ #ifndef STBI_NO_FAILURE_STRINGS
+ // not threadsafe
+ static char invalid_chunk[] = "XXXX chunk not known";
+ invalid_chunk[0] = (uint8) (c.type >> 24);
+ invalid_chunk[1] = (uint8) (c.type >> 16);
+ invalid_chunk[2] = (uint8) (c.type >> 8);
+ invalid_chunk[3] = (uint8) (c.type >> 0);
+ #endif
+ return e(invalid_chunk, "PNG not supported: unknown chunk type");
+ }
+ skip(s, c.length);
+ break;
+ }
+ // end of chunk, read and skip CRC
+ get32(s);
+ }
+}
+
+static unsigned char *do_png(png *p, int *x, int *y, int *n, int req_comp)
+{
+ unsigned char *result=NULL;
+ if (req_comp < 0 || req_comp > 4) return epuc("bad req_comp", "Internal error");
+ if (parse_png_file(p, SCAN_load, req_comp)) {
+ result = p->out;
+ p->out = NULL;
+ if (req_comp && req_comp != p->s->img_out_n) {
+ result = convert_format(result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+ p->s->img_out_n = req_comp;
+ if (result == NULL) return result;
+ }
+ *x = p->s->img_x;
+ *y = p->s->img_y;
+ if (n) *n = p->s->img_n;
+ }
+ free(p->out); p->out = NULL;
+ free(p->expanded); p->expanded = NULL;
+ free(p->idata); p->idata = NULL;
+
+ return result;
+}
+
+static unsigned char *stbi_png_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ png p;
+ p.s = s;
+ return do_png(&p, x,y,comp,req_comp);
+}
+
+static int stbi_png_test(stbi *s)
+{
+ int r;
+ r = check_png_header(s);
+ stbi_rewind(s);
+ return r;
+}
+
+static int stbi_png_info_raw(png *p, int *x, int *y, int *comp)
+{
+ if (!parse_png_file(p, SCAN_header, 0)) {
+ stbi_rewind( p->s );
+ return 0;
+ }
+ if (x) *x = p->s->img_x;
+ if (y) *y = p->s->img_y;
+ if (comp) *comp = p->s->img_n;
+ return 1;
+}
+
+static int stbi_png_info(stbi *s, int *x, int *y, int *comp)
+{
+ png p;
+ p.s = s;
+ return stbi_png_info_raw(&p, x, y, comp);
+}
+
+// Microsoft/Windows BMP image
+
+static int bmp_test(stbi *s)
+{
+ int sz;
+ if (get8(s) != 'B') return 0;
+ if (get8(s) != 'M') return 0;
+ get32le(s); // discard filesize
+ get16le(s); // discard reserved
+ get16le(s); // discard reserved
+ get32le(s); // discard data offset
+ sz = get32le(s);
+ if (sz == 12 || sz == 40 || sz == 56 || sz == 108) return 1;
+ return 0;
+}
+
+static int stbi_bmp_test(stbi *s)
+{
+ int r = bmp_test(s);
+ stbi_rewind(s);
+ return r;
+}
+
+
+// returns 0..31 for the highest set bit
+static int high_bit(unsigned int z)
+{
+ int n=0;
+ if (z == 0) return -1;
+ if (z >= 0x10000) n += 16, z >>= 16;
+ if (z >= 0x00100) n += 8, z >>= 8;
+ if (z >= 0x00010) n += 4, z >>= 4;
+ if (z >= 0x00004) n += 2, z >>= 2;
+ if (z >= 0x00002) n += 1, z >>= 1;
+ return n;
+}
+
+static int bitcount(unsigned int a)
+{
+ a = (a & 0x55555555) + ((a >> 1) & 0x55555555); // max 2
+ a = (a & 0x33333333) + ((a >> 2) & 0x33333333); // max 4
+ a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+ a = (a + (a >> 8)); // max 16 per 8 bits
+ a = (a + (a >> 16)); // max 32 per 8 bits
+ return a & 0xff;
+}
+
+static int shiftsigned(int v, int shift, int bits)
+{
+ int result;
+ int z=0;
+
+ if (shift < 0) v <<= -shift;
+ else v >>= shift;
+ result = v;
+
+ z = bits;
+ while (z < 8) {
+ result += v >> z;
+ z += bits;
+ }
+ return result;
+}
+
+static stbi_uc *bmp_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ uint8 *out;
+ unsigned int mr=0,mg=0,mb=0,ma=0, fake_a=0;
+ stbi_uc pal[256][4];
+ int psize=0,i,j,compress=0,width;
+ int bpp, flip_vertically, pad, target, offset, hsz;
+ if (get8(s) != 'B' || get8(s) != 'M') return epuc("not BMP", "Corrupt BMP");
+ get32le(s); // discard filesize
+ get16le(s); // discard reserved
+ get16le(s); // discard reserved
+ offset = get32le(s);
+ hsz = get32le(s);
+ if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) return epuc("unknown BMP", "BMP type not supported: unknown");
+ if (hsz == 12) {
+ s->img_x = get16le(s);
+ s->img_y = get16le(s);
+ } else {
+ s->img_x = get32le(s);
+ s->img_y = get32le(s);
+ }
+ if (get16le(s) != 1) return epuc("bad BMP", "bad BMP");
+ bpp = get16le(s);
+ if (bpp == 1) return epuc("monochrome", "BMP type not supported: 1-bit");
+ flip_vertically = ((int) s->img_y) > 0;
+ s->img_y = abs((int) s->img_y);
+ if (hsz == 12) {
+ if (bpp < 24)
+ psize = (offset - 14 - 24) / 3;
+ } else {
+ compress = get32le(s);
+ if (compress == 1 || compress == 2) return epuc("BMP RLE", "BMP type not supported: RLE");
+ get32le(s); // discard sizeof
+ get32le(s); // discard hres
+ get32le(s); // discard vres
+ get32le(s); // discard colorsused
+ get32le(s); // discard max important
+ if (hsz == 40 || hsz == 56) {
+ if (hsz == 56) {
+ get32le(s);
+ get32le(s);
+ get32le(s);
+ get32le(s);
+ }
+ if (bpp == 16 || bpp == 32) {
+ mr = mg = mb = 0;
+ if (compress == 0) {
+ if (bpp == 32) {
+ mr = 0xffu << 16;
+ mg = 0xffu << 8;
+ mb = 0xffu << 0;
+ ma = 0xffu << 24;
+ fake_a = 1; // @TODO: check for cases like alpha value is all 0 and switch it to 255
+ } else {
+ mr = 31u << 10;
+ mg = 31u << 5;
+ mb = 31u << 0;
+ }
+ } else if (compress == 3) {
+ mr = get32le(s);
+ mg = get32le(s);
+ mb = get32le(s);
+ // not documented, but generated by photoshop and handled by mspaint
+ if (mr == mg && mg == mb) {
+ // ?!?!?
+ return epuc("bad BMP", "bad BMP");
+ }
+ } else
+ return epuc("bad BMP", "bad BMP");
+ }
+ } else {
+ assert(hsz == 108);
+ mr = get32le(s);
+ mg = get32le(s);
+ mb = get32le(s);
+ ma = get32le(s);
+ get32le(s); // discard color space
+ for (i=0; i < 12; ++i)
+ get32le(s); // discard color space parameters
+ }
+ if (bpp < 16)
+ psize = (offset - 14 - hsz) >> 2;
+ }
+ s->img_n = ma ? 4 : 3;
+ if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+ target = req_comp;
+ else
+ target = s->img_n; // if they want monochrome, we'll post-convert
+ out = (stbi_uc *) malloc(target * s->img_x * s->img_y);
+ if (!out) return epuc("outofmem", "Out of memory");
+ if (bpp < 16) {
+ int z=0;
+ if (psize == 0 || psize > 256) { free(out); return epuc("invalid", "Corrupt BMP"); }
+ for (i=0; i < psize; ++i) {
+ pal[i][2] = get8u(s);
+ pal[i][1] = get8u(s);
+ pal[i][0] = get8u(s);
+ if (hsz != 12) get8(s);
+ pal[i][3] = 255;
+ }
+ skip(s, offset - 14 - hsz - psize * (hsz == 12 ? 3 : 4));
+ if (bpp == 4) width = (s->img_x + 1) >> 1;
+ else if (bpp == 8) width = s->img_x;
+ else { free(out); return epuc("bad bpp", "Corrupt BMP"); }
+ pad = (-width)&3;
+ for (j=0; j < (int) s->img_y; ++j) {
+ for (i=0; i < (int) s->img_x; i += 2) {
+ int v=get8(s),v2=0;
+ if (bpp == 4) {
+ v2 = v & 15;
+ v >>= 4;
+ }
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4) out[z++] = 255;
+ if (i+1 == (int) s->img_x) break;
+ v = (bpp == 8) ? get8(s) : v2;
+ out[z++] = pal[v][0];
+ out[z++] = pal[v][1];
+ out[z++] = pal[v][2];
+ if (target == 4) out[z++] = 255;
+ }
+ skip(s, pad);
+ }
+ } else {
+ int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
+ int z = 0;
+ int easy=0;
+ skip(s, offset - 14 - hsz);
+ if (bpp == 24) width = 3 * s->img_x;
+ else if (bpp == 16) width = 2*s->img_x;
+ else /* bpp = 32 and pad = 0 */ width=0;
+ pad = (-width) & 3;
+ if (bpp == 24) {
+ easy = 1;
+ } else if (bpp == 32) {
+ if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+ easy = 2;
+ }
+ if (!easy) {
+ if (!mr || !mg || !mb) { free(out); return epuc("bad masks", "Corrupt BMP"); }
+ // right shift amt to put high bit in position #7
+ rshift = high_bit(mr)-7; rcount = bitcount(mr);
+ gshift = high_bit(mg)-7; gcount = bitcount(mr);
+ bshift = high_bit(mb)-7; bcount = bitcount(mr);
+ ashift = high_bit(ma)-7; acount = bitcount(mr);
+ }
+ for (j=0; j < (int) s->img_y; ++j) {
+ if (easy) {
+ for (i=0; i < (int) s->img_x; ++i) {
+ int a;
+ out[z+2] = get8u(s);
+ out[z+1] = get8u(s);
+ out[z+0] = get8u(s);
+ z += 3;
+ a = (easy == 2 ? get8(s) : 255);
+ if (target == 4) out[z++] = (uint8) a;
+ }
+ } else {
+ for (i=0; i < (int) s->img_x; ++i) {
+ uint32 v = (bpp == 16 ? get16le(s) : get32le(s));
+ int a;
+ out[z++] = (uint8) shiftsigned(v & mr, rshift, rcount);
+ out[z++] = (uint8) shiftsigned(v & mg, gshift, gcount);
+ out[z++] = (uint8) shiftsigned(v & mb, bshift, bcount);
+ a = (ma ? shiftsigned(v & ma, ashift, acount) : 255);
+ if (target == 4) out[z++] = (uint8) a;
+ }
+ }
+ skip(s, pad);
+ }
+ }
+ if (flip_vertically) {
+ stbi_uc t;
+ for (j=0; j < (int) s->img_y>>1; ++j) {
+ stbi_uc *p1 = out + j *s->img_x*target;
+ stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
+ for (i=0; i < (int) s->img_x*target; ++i) {
+ t = p1[i], p1[i] = p2[i], p2[i] = t;
+ }
+ }
+ }
+
+ if (req_comp && req_comp != target) {
+ out = convert_format(out, target, req_comp, s->img_x, s->img_y);
+ if (out == NULL) return out; // convert_format frees input on failure
+ }
+
+ *x = s->img_x;
+ *y = s->img_y;
+ if (comp) *comp = s->img_n;
+ return out;
+
+ NVG_NOTUSED(fake_a);
+}
+
+static stbi_uc *stbi_bmp_load(stbi *s,int *x, int *y, int *comp, int req_comp)
+{
+ return bmp_load(s, x,y,comp,req_comp);
+}
+
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+
+static int tga_info(stbi *s, int *x, int *y, int *comp)
+{
+ int tga_w, tga_h, tga_comp;
+ int sz;
+ get8u(s); // discard Offset
+ sz = get8u(s); // color type
+ if( sz > 1 ) {
+ stbi_rewind(s);
+ return 0; // only RGB or indexed allowed
+ }
+ sz = get8u(s); // image type
+ // only RGB or grey allowed, +/- RLE
+ if ((sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11)) return 0;
+ skip(s,9);
+ tga_w = get16le(s);
+ if( tga_w < 1 ) {
+ stbi_rewind(s);
+ return 0; // test width
+ }
+ tga_h = get16le(s);
+ if( tga_h < 1 ) {
+ stbi_rewind(s);
+ return 0; // test height
+ }
+ sz = get8(s); // bits per pixel
+ // only RGB or RGBA or grey allowed
+ if ((sz != 8) && (sz != 16) && (sz != 24) && (sz != 32)) {
+ stbi_rewind(s);
+ return 0;
+ }
+ tga_comp = sz;
+ if (x) *x = tga_w;
+ if (y) *y = tga_h;
+ if (comp) *comp = tga_comp / 8;
+ return 1; // seems to have passed everything
+}
+
+int stbi_tga_info(stbi *s, int *x, int *y, int *comp)
+{
+ return tga_info(s, x, y, comp);
+}
+
+static int tga_test(stbi *s)
+{
+ int sz;
+ get8u(s); // discard Offset
+ sz = get8u(s); // color type
+ if ( sz > 1 ) return 0; // only RGB or indexed allowed
+ sz = get8u(s); // image type
+ if ( (sz != 1) && (sz != 2) && (sz != 3) && (sz != 9) && (sz != 10) && (sz != 11) ) return 0; // only RGB or grey allowed, +/- RLE
+ get16(s); // discard palette start
+ get16(s); // discard palette length
+ get8(s); // discard bits per palette color entry
+ get16(s); // discard x origin
+ get16(s); // discard y origin
+ if ( get16(s) < 1 ) return 0; // test width
+ if ( get16(s) < 1 ) return 0; // test height
+ sz = get8(s); // bits per pixel
+ if ( (sz != 8) && (sz != 16) && (sz != 24) && (sz != 32) ) return 0; // only RGB or RGBA or grey allowed
+ return 1; // seems to have passed everything
+}
+
+static int stbi_tga_test(stbi *s)
+{
+ int res = tga_test(s);
+ stbi_rewind(s);
+ return res;
+}
+
+static stbi_uc *tga_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ // read in the TGA header stuff
+ int tga_offset = get8u(s);
+ int tga_indexed = get8u(s);
+ int tga_image_type = get8u(s);
+ int tga_is_RLE = 0;
+ int tga_palette_start = get16le(s);
+ int tga_palette_len = get16le(s);
+ int tga_palette_bits = get8u(s);
+ int tga_x_origin = get16le(s);
+ int tga_y_origin = get16le(s);
+ int tga_width = get16le(s);
+ int tga_height = get16le(s);
+ int tga_bits_per_pixel = get8u(s);
+ int tga_inverted = get8u(s);
+ // image data
+ unsigned char *tga_data;
+ unsigned char *tga_palette = NULL;
+ int i, j;
+ unsigned char raw_data[4];
+ unsigned char trans_data[4];
+ int RLE_count = 0;
+ int RLE_repeating = 0;
+ int read_next_pixel = 1;
+
+ // do a tiny bit of precessing
+ if ( tga_image_type >= 8 )
+ {
+ tga_image_type -= 8;
+ tga_is_RLE = 1;
+ }
+ /* int tga_alpha_bits = tga_inverted & 15; */
+ tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+ // error check
+ if ( //(tga_indexed) ||
+ (tga_width < 1) || (tga_height < 1) ||
+ (tga_image_type < 1) || (tga_image_type > 3) ||
+ ((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16) &&
+ (tga_bits_per_pixel != 24) && (tga_bits_per_pixel != 32))
+ )
+ {
+ return NULL; // we don't report this as a bad TGA because we don't even know if it's TGA
+ }
+
+ // If I'm paletted, then I'll use the number of bits from the palette
+ if ( tga_indexed )
+ {
+ tga_bits_per_pixel = tga_palette_bits;
+ }
+
+ // tga info
+ *x = tga_width;
+ *y = tga_height;
+ if ( (req_comp < 1) || (req_comp > 4) )
+ {
+ // just use whatever the file was
+ req_comp = tga_bits_per_pixel / 8;
+ *comp = req_comp;
+ } else
+ {
+ // force a new number of components
+ *comp = tga_bits_per_pixel/8;
+ }
+ tga_data = (unsigned char*)malloc( tga_width * tga_height * req_comp );
+ if (!tga_data) return epuc("outofmem", "Out of memory");
+
+ // skip to the data's starting position (offset usually = 0)
+ skip(s, tga_offset );
+ // do I need to load a palette?
+ if ( tga_indexed )
+ {
+ // any data to skip? (offset usually = 0)
+ skip(s, tga_palette_start );
+ // load the palette
+ tga_palette = (unsigned char*)malloc( tga_palette_len * tga_palette_bits / 8 );
+ if (!tga_palette) return epuc("outofmem", "Out of memory");
+ if (!getn(s, tga_palette, tga_palette_len * tga_palette_bits / 8 )) {
+ free(tga_data);
+ free(tga_palette);
+ return epuc("bad palette", "Corrupt TGA");
+ }
+ }
+ // load the data
+ trans_data[0] = trans_data[1] = trans_data[2] = trans_data[3] = 0;
+ for (i=0; i < tga_width * tga_height; ++i)
+ {
+ // if I'm in RLE mode, do I need to get a RLE chunk?
+ if ( tga_is_RLE )
+ {
+ if ( RLE_count == 0 )
+ {
+ // yep, get the next byte as a RLE command
+ int RLE_cmd = get8u(s);
+ RLE_count = 1 + (RLE_cmd & 127);
+ RLE_repeating = RLE_cmd >> 7;
+ read_next_pixel = 1;
+ } else if ( !RLE_repeating )
+ {
+ read_next_pixel = 1;
+ }
+ } else
+ {
+ read_next_pixel = 1;
+ }
+ // OK, if I need to read a pixel, do it now
+ if ( read_next_pixel )
+ {
+ // load however much data we did have
+ if ( tga_indexed )
+ {
+ // read in 1 byte, then perform the lookup
+ int pal_idx = get8u(s);
+ if ( pal_idx >= tga_palette_len )
+ {
+ // invalid index
+ pal_idx = 0;
+ }
+ pal_idx *= tga_bits_per_pixel / 8;
+ for (j = 0; j*8 < tga_bits_per_pixel; ++j)
+ {
+ raw_data[j] = tga_palette[pal_idx+j];
+ }
+ } else
+ {
+ // read in the data raw
+ for (j = 0; j*8 < tga_bits_per_pixel; ++j)
+ {
+ raw_data[j] = get8u(s);
+ }
+ }
+ // convert raw to the intermediate format
+ switch (tga_bits_per_pixel)
+ {
+ case 8:
+ // Luminous => RGBA
+ trans_data[0] = raw_data[0];
+ trans_data[1] = raw_data[0];
+ trans_data[2] = raw_data[0];
+ trans_data[3] = 255;
+ break;
+ case 16:
+ // Luminous,Alpha => RGBA
+ trans_data[0] = raw_data[0];
+ trans_data[1] = raw_data[0];
+ trans_data[2] = raw_data[0];
+ trans_data[3] = raw_data[1];
+ break;
+ case 24:
+ // BGR => RGBA
+ trans_data[0] = raw_data[2];
+ trans_data[1] = raw_data[1];
+ trans_data[2] = raw_data[0];
+ trans_data[3] = 255;
+ break;
+ case 32:
+ // BGRA => RGBA
+ trans_data[0] = raw_data[2];
+ trans_data[1] = raw_data[1];
+ trans_data[2] = raw_data[0];
+ trans_data[3] = raw_data[3];
+ break;
+ }
+ // clear the reading flag for the next pixel
+ read_next_pixel = 0;
+ } // end of reading a pixel
+ // convert to final format
+ switch (req_comp)
+ {
+ case 1:
+ // RGBA => Luminance
+ tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]);
+ break;
+ case 2:
+ // RGBA => Luminance,Alpha
+ tga_data[i*req_comp+0] = compute_y(trans_data[0],trans_data[1],trans_data[2]);
+ tga_data[i*req_comp+1] = trans_data[3];
+ break;
+ case 3:
+ // RGBA => RGB
+ tga_data[i*req_comp+0] = trans_data[0];
+ tga_data[i*req_comp+1] = trans_data[1];
+ tga_data[i*req_comp+2] = trans_data[2];
+ break;
+ case 4:
+ // RGBA => RGBA
+ tga_data[i*req_comp+0] = trans_data[0];
+ tga_data[i*req_comp+1] = trans_data[1];
+ tga_data[i*req_comp+2] = trans_data[2];
+ tga_data[i*req_comp+3] = trans_data[3];
+ break;
+ }
+ // in case we're in RLE mode, keep counting down
+ --RLE_count;
+ }
+ // do I need to invert the image?
+ if ( tga_inverted )
+ {
+ for (j = 0; j*2 < tga_height; ++j)
+ {
+ int index1 = j * tga_width * req_comp;
+ int index2 = (tga_height - 1 - j) * tga_width * req_comp;
+ for (i = tga_width * req_comp; i > 0; --i)
+ {
+ unsigned char temp = tga_data[index1];
+ tga_data[index1] = tga_data[index2];
+ tga_data[index2] = temp;
+ ++index1;
+ ++index2;
+ }
+ }
+ }
+ // clear my palette, if I had one
+ if ( tga_palette != NULL )
+ {
+ free( tga_palette );
+ }
+ // the things I do to get rid of an error message, and yet keep
+ // Microsoft's C compilers happy... [8^(
+ tga_palette_start = tga_palette_len = tga_palette_bits =
+ tga_x_origin = tga_y_origin = 0;
+ // OK, done
+ return tga_data;
+}
+
+static stbi_uc *stbi_tga_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ return tga_load(s,x,y,comp,req_comp);
+}
+
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+
+static int psd_test(stbi *s)
+{
+ if (get32(s) != 0x38425053) return 0; // "8BPS"
+ else return 1;
+}
+
+static int stbi_psd_test(stbi *s)
+{
+ int r = psd_test(s);
+ stbi_rewind(s);
+ return r;
+}
+
+static stbi_uc *psd_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ int pixelCount;
+ int channelCount, compression;
+ int channel, i, count, len;
+ int w,h;
+ uint8 *out;
+
+ // Check identifier
+ if (get32(s) != 0x38425053) // "8BPS"
+ return epuc("not PSD", "Corrupt PSD image");
+
+ // Check file type version.
+ if (get16(s) != 1)
+ return epuc("wrong version", "Unsupported version of PSD image");
+
+ // Skip 6 reserved bytes.
+ skip(s, 6 );
+
+ // Read the number of channels (R, G, B, A, etc).
+ channelCount = get16(s);
+ if (channelCount < 0 || channelCount > 16)
+ return epuc("wrong channel count", "Unsupported number of channels in PSD image");
+
+ // Read the rows and columns of the image.
+ h = get32(s);
+ w = get32(s);
+
+ // Make sure the depth is 8 bits.
+ if (get16(s) != 8)
+ return epuc("unsupported bit depth", "PSD bit depth is not 8 bit");
+
+ // Make sure the color mode is RGB.
+ // Valid options are:
+ // 0: Bitmap
+ // 1: Grayscale
+ // 2: Indexed color
+ // 3: RGB color
+ // 4: CMYK color
+ // 7: Multichannel
+ // 8: Duotone
+ // 9: Lab color
+ if (get16(s) != 3)
+ return epuc("wrong color format", "PSD is not in RGB color format");
+
+ // Skip the Mode Data. (It's the palette for indexed color; other info for other modes.)
+ skip(s,get32(s) );
+
+ // Skip the image resources. (resolution, pen tool paths, etc)
+ skip(s, get32(s) );
+
+ // Skip the reserved data.
+ skip(s, get32(s) );
+
+ // Find out if the data is compressed.
+ // Known values:
+ // 0: no compression
+ // 1: RLE compressed
+ compression = get16(s);
+ if (compression > 1)
+ return epuc("bad compression", "PSD has an unknown compression format");
+
+ // Create the destination image.
+ out = (stbi_uc *) malloc(4 * w*h);
+ if (!out) return epuc("outofmem", "Out of memory");
+ pixelCount = w*h;
+
+ // Initialize the data to zero.
+ //memset( out, 0, pixelCount * 4 );
+
+ // Finally, the image data.
+ if (compression) {
+ // RLE as used by .PSD and .TIFF
+ // Loop until you get the number of unpacked bytes you are expecting:
+ // Read the next source byte into n.
+ // If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
+ // Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
+ // Else if n is 128, noop.
+ // Endloop
+
+ // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data,
+ // which we're going to just skip.
+ skip(s, h * channelCount * 2 );
+
+ // Read the RLE data by channel.
+ for (channel = 0; channel < 4; channel++) {
+ uint8 *p;
+
+ p = out+channel;
+ if (channel >= channelCount) {
+ // Fill this channel with default data.
+ for (i = 0; i < pixelCount; i++) *p = (channel == 3 ? 255 : 0), p += 4;
+ } else {
+ // Read the RLE data.
+ count = 0;
+ while (count < pixelCount) {
+ len = get8(s);
+ if (len == 128) {
+ // No-op.
+ } else if (len < 128) {
+ // Copy next len+1 bytes literally.
+ len++;
+ count += len;
+ while (len) {
+ *p = get8u(s);
+ p += 4;
+ len--;
+ }
+ } else if (len > 128) {
+ uint8 val;
+ // Next -len+1 bytes in the dest are replicated from next source byte.
+ // (Interpret len as a negative 8-bit int.)
+ len ^= 0x0FF;
+ len += 2;
+ val = get8u(s);
+ count += len;
+ while (len) {
+ *p = val;
+ p += 4;
+ len--;
+ }
+ }
+ }
+ }
+ }
+
+ } else {
+ // We're at the raw image data. It's each channel in order (Red, Green, Blue, Alpha, ...)
+ // where each channel consists of an 8-bit value for each pixel in the image.
+
+ // Read the data by channel.
+ for (channel = 0; channel < 4; channel++) {
+ uint8 *p;
+
+ p = out + channel;
+ if (channel > channelCount) {
+ // Fill this channel with default data.
+ for (i = 0; i < pixelCount; i++) *p = channel == 3 ? 255 : 0, p += 4;
+ } else {
+ // Read the data.
+ for (i = 0; i < pixelCount; i++)
+ *p = get8u(s), p += 4;
+ }
+ }
+ }
+
+ if (req_comp && req_comp != 4) {
+ out = convert_format(out, 4, req_comp, w, h);
+ if (out == NULL) return out; // convert_format frees input on failure
+ }
+
+ if (comp) *comp = channelCount;
+ *y = h;
+ *x = w;
+
+ return out;
+}
+
+static stbi_uc *stbi_psd_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ return psd_load(s,x,y,comp,req_comp);
+}
+
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+
+static int pic_is4(stbi *s,const char *str)
+{
+ int i;
+ for (i=0; i<4; ++i)
+ if (get8(s) != (stbi_uc)str[i])
+ return 0;
+
+ return 1;
+}
+
+static int pic_test(stbi *s)
+{
+ int i;
+
+ if (!pic_is4(s,"\x53\x80\xF6\x34"))
+ return 0;
+
+ for(i=0;i<84;++i)
+ get8(s);
+
+ if (!pic_is4(s,"PICT"))
+ return 0;
+
+ return 1;
+}
+
+typedef struct
+{
+ stbi_uc size,type,channel;
+} pic_packet_t;
+
+static stbi_uc *pic_readval(stbi *s, int channel, stbi_uc *dest)
+{
+ int mask=0x80, i;
+
+ for (i=0; i<4; ++i, mask>>=1) {
+ if (channel & mask) {
+ if (at_eof(s)) return epuc("bad file","PIC file too short");
+ dest[i]=get8u(s);
+ }
+ }
+
+ return dest;
+}
+
+static void pic_copyval(int channel,stbi_uc *dest,const stbi_uc *src)
+{
+ int mask=0x80,i;
+
+ for (i=0;i<4; ++i, mask>>=1)
+ if (channel&mask)
+ dest[i]=src[i];
+}
+
+static stbi_uc *pic_load2(stbi *s,int width,int height,int *comp, stbi_uc *result)
+{
+ int act_comp=0,num_packets=0,y,chained;
+ pic_packet_t packets[10];
+
+ // this will (should...) cater for even some bizarre stuff like having data
+ // for the same channel in multiple packets.
+ do {
+ pic_packet_t *packet;
+
+ if (num_packets==sizeof(packets)/sizeof(packets[0]))
+ return epuc("bad format","too many packets");
+
+ packet = &packets[num_packets++];
+
+ chained = get8(s);
+ packet->size = get8u(s);
+ packet->type = get8u(s);
+ packet->channel = get8u(s);
+
+ act_comp |= packet->channel;
+
+ if (at_eof(s)) return epuc("bad file","file too short (reading packets)");
+ if (packet->size != 8) return epuc("bad format","packet isn't 8bpp");
+ } while (chained);
+
+ *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+
+ for(y=0; y<height; ++y) {
+ int packet_idx;
+
+ for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
+ pic_packet_t *packet = &packets[packet_idx];
+ stbi_uc *dest = result+y*width*4;
+
+ switch (packet->type) {
+ default:
+ return epuc("bad format","packet has bad compression type");
+
+ case 0: {//uncompressed
+ int x;
+
+ for(x=0;x<width;++x, dest+=4)
+ if (!pic_readval(s,packet->channel,dest))
+ return 0;
+ break;
+ }
+
+ case 1://Pure RLE
+ {
+ int left=width, i;
+
+ while (left>0) {
+ stbi_uc count,value[4];
+
+ count=get8u(s);
+ if (at_eof(s)) return epuc("bad file","file too short (pure read count)");
+
+ if (count > left)
+ count = (uint8) left;
+
+ if (!pic_readval(s,packet->channel,value)) return 0;
+
+ for(i=0; i<count; ++i,dest+=4)
+ pic_copyval(packet->channel,dest,value);
+ left -= count;
+ }
+ }
+ break;
+
+ case 2: {//Mixed RLE
+ int left=width;
+ while (left>0) {
+ int count = get8(s), i;
+ if (at_eof(s)) return epuc("bad file","file too short (mixed read count)");
+
+ if (count >= 128) { // Repeated
+ stbi_uc value[4];
+ int i;
+
+ if (count==128)
+ count = get16(s);
+ else
+ count -= 127;
+ if (count > left)
+ return epuc("bad file","scanline overrun");
+
+ if (!pic_readval(s,packet->channel,value))
+ return 0;
+
+ for(i=0;i<count;++i, dest += 4)
+ pic_copyval(packet->channel,dest,value);
+ } else { // Raw
+ ++count;
+ if (count>left) return epuc("bad file","scanline overrun");
+
+ for(i=0;i<count;++i, dest+=4)
+ if (!pic_readval(s,packet->channel,dest))
+ return 0;
+ }
+ left-=count;
+ }
+ break;
+ }
+ }
+ }
+ }
+
+ return result;
+}
+
+static stbi_uc *pic_load(stbi *s,int *px,int *py,int *comp,int req_comp)
+{
+ stbi_uc *result;
+ int i, x,y;
+
+ for (i=0; i<92; ++i)
+ get8(s);
+
+ x = get16(s);
+ y = get16(s);
+ if (at_eof(s)) return epuc("bad file","file too short (pic header)");
+ if ((1 << 28) / x < y) return epuc("too large", "Image too large to decode");
+
+ get32(s); //skip `ratio'
+ get16(s); //skip `fields'
+ get16(s); //skip `pad'
+
+ // intermediate buffer is RGBA
+ result = (stbi_uc *) malloc(x*y*4);
+ memset(result, 0xff, x*y*4);
+
+ if (!pic_load2(s,x,y,comp, result)) {
+ free(result);
+ result=0;
+ }
+ *px = x;
+ *py = y;
+ if (req_comp == 0) req_comp = *comp;
+ result=convert_format(result,4,req_comp,x,y);
+
+ return result;
+}
+
+static int stbi_pic_test(stbi *s)
+{
+ int r = pic_test(s);
+ stbi_rewind(s);
+ return r;
+}
+
+static stbi_uc *stbi_pic_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ return pic_load(s,x,y,comp,req_comp);
+}
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+typedef struct stbi_gif_lzw_struct {
+ int16 prefix;
+ uint8 first;
+ uint8 suffix;
+} stbi_gif_lzw;
+
+typedef struct stbi_gif_struct
+{
+ int w,h;
+ stbi_uc *out; // output buffer (always 4 components)
+ int flags, bgindex, ratio, transparent, eflags;
+ uint8 pal[256][4];
+ uint8 lpal[256][4];
+ stbi_gif_lzw codes[4096];
+ uint8 *color_table;
+ int parse, step;
+ int lflags;
+ int start_x, start_y;
+ int max_x, max_y;
+ int cur_x, cur_y;
+ int line_size;
+} stbi_gif;
+
+static int gif_test(stbi *s)
+{
+ int sz;
+ if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8') return 0;
+ sz = get8(s);
+ if (sz != '9' && sz != '7') return 0;
+ if (get8(s) != 'a') return 0;
+ return 1;
+}
+
+static int stbi_gif_test(stbi *s)
+{
+ int r = gif_test(s);
+ stbi_rewind(s);
+ return r;
+}
+
+static void stbi_gif_parse_colortable(stbi *s, uint8 pal[256][4], int num_entries, int transp)
+{
+ int i;
+ for (i=0; i < num_entries; ++i) {
+ pal[i][2] = get8u(s);
+ pal[i][1] = get8u(s);
+ pal[i][0] = get8u(s);
+ pal[i][3] = transp ? 0 : 255;
+ }
+}
+
+static int stbi_gif_header(stbi *s, stbi_gif *g, int *comp, int is_info)
+{
+ uint8 version;
+ if (get8(s) != 'G' || get8(s) != 'I' || get8(s) != 'F' || get8(s) != '8')
+ return e("not GIF", "Corrupt GIF");
+
+ version = get8u(s);
+ if (version != '7' && version != '9') return e("not GIF", "Corrupt GIF");
+ if (get8(s) != 'a') return e("not GIF", "Corrupt GIF");
+
+ failure_reason = "";
+ g->w = get16le(s);
+ g->h = get16le(s);
+ g->flags = get8(s);
+ g->bgindex = get8(s);
+ g->ratio = get8(s);
+ g->transparent = -1;
+
+ if (comp != 0) *comp = 4; // can't actually tell whether it's 3 or 4 until we parse the comments
+
+ if (is_info) return 1;
+
+ if (g->flags & 0x80)
+ stbi_gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
+
+ return 1;
+}
+
+static int stbi_gif_info_raw(stbi *s, int *x, int *y, int *comp)
+{
+ stbi_gif g;
+ if (!stbi_gif_header(s, &g, comp, 1)) {
+ stbi_rewind( s );
+ return 0;
+ }
+ if (x) *x = g.w;
+ if (y) *y = g.h;
+ return 1;
+}
+
+static void stbi_out_gif_code(stbi_gif *g, uint16 code)
+{
+ uint8 *p, *c;
+
+ // recurse to decode the prefixes, since the linked-list is backwards,
+ // and working backwards through an interleaved image would be nasty
+ if (g->codes[code].prefix >= 0)
+ stbi_out_gif_code(g, g->codes[code].prefix);
+
+ if (g->cur_y >= g->max_y) return;
+
+ p = &g->out[g->cur_x + g->cur_y];
+ c = &g->color_table[g->codes[code].suffix * 4];
+
+ if (c[3] >= 128) {
+ p[0] = c[2];
+ p[1] = c[1];
+ p[2] = c[0];
+ p[3] = c[3];
+ }
+ g->cur_x += 4;
+
+ if (g->cur_x >= g->max_x) {
+ g->cur_x = g->start_x;
+ g->cur_y += g->step;
+
+ while (g->cur_y >= g->max_y && g->parse > 0) {
+ g->step = (1 << g->parse) * g->line_size;
+ g->cur_y = g->start_y + (g->step >> 1);
+ --g->parse;
+ }
+ }
+}
+
+static uint8 *stbi_process_gif_raster(stbi *s, stbi_gif *g)
+{
+ uint8 lzw_cs;
+ int32 len, code;
+ uint32 first;
+ int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+ stbi_gif_lzw *p;
+
+ lzw_cs = get8u(s);
+ clear = 1 << lzw_cs;
+ first = 1;
+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ bits = 0;
+ valid_bits = 0;
+ for (code = 0; code < clear; code++) {
+ g->codes[code].prefix = -1;
+ g->codes[code].first = (uint8) code;
+ g->codes[code].suffix = (uint8) code;
+ }
+
+ // support no starting clear code
+ avail = clear+2;
+ oldcode = -1;
+
+ len = 0;
+ for(;;) {
+ if (valid_bits < codesize) {
+ if (len == 0) {
+ len = get8(s); // start new block
+ if (len == 0)
+ return g->out;
+ }
+ --len;
+ bits |= (int32) get8(s) << valid_bits;
+ valid_bits += 8;
+ } else {
+ int32 code = bits & codemask;
+ bits >>= codesize;
+ valid_bits -= codesize;
+ // @OPTIMIZE: is there some way we can accelerate the non-clear path?
+ if (code == clear) { // clear code
+ codesize = lzw_cs + 1;
+ codemask = (1 << codesize) - 1;
+ avail = clear + 2;
+ oldcode = -1;
+ first = 0;
+ } else if (code == clear + 1) { // end of stream code
+ skip(s, len);
+ while ((len = get8(s)) > 0)
+ skip(s,len);
+ return g->out;
+ } else if (code <= avail) {
+ if (first) return epuc("no clear code", "Corrupt GIF");
+
+ if (oldcode >= 0) {
+ p = &g->codes[avail++];
+ if (avail > 4096) return epuc("too many codes", "Corrupt GIF");
+ p->prefix = (int16) oldcode;
+ p->first = g->codes[oldcode].first;
+ p->suffix = (code == avail) ? p->first : g->codes[code].first;
+ } else if (code == avail)
+ return epuc("illegal code in raster", "Corrupt GIF");
+
+ stbi_out_gif_code(g, (uint16) code);
+
+ if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+ codesize++;
+ codemask = (1 << codesize) - 1;
+ }
+
+ oldcode = code;
+ } else {
+ return epuc("illegal code in raster", "Corrupt GIF");
+ }
+ }
+ }
+}
+
+static void stbi_fill_gif_background(stbi_gif *g)
+{
+ int i;
+ uint8 *c = g->pal[g->bgindex];
+ // @OPTIMIZE: write a dword at a time
+ for (i = 0; i < g->w * g->h * 4; i += 4) {
+ uint8 *p = &g->out[i];
+ p[0] = c[2];
+ p[1] = c[1];
+ p[2] = c[0];
+ p[3] = c[3];
+ }
+}
+
+// this function is designed to support animated gifs, although stb_image doesn't support it
+static uint8 *stbi_gif_load_next(stbi *s, stbi_gif *g, int *comp, int req_comp)
+{
+ int i;
+ uint8 *old_out = 0;
+
+ if (g->out == 0) {
+ if (!stbi_gif_header(s, g, comp,0)) return 0; // failure_reason set by stbi_gif_header
+ g->out = (uint8 *) malloc(4 * g->w * g->h);
+ if (g->out == 0) return epuc("outofmem", "Out of memory");
+ stbi_fill_gif_background(g);
+ } else {
+ // animated-gif-only path
+ if (((g->eflags & 0x1C) >> 2) == 3) {
+ old_out = g->out;
+ g->out = (uint8 *) malloc(4 * g->w * g->h);
+ if (g->out == 0) return epuc("outofmem", "Out of memory");
+ memcpy(g->out, old_out, g->w*g->h*4);
+ }
+ }
+
+ for (;;) {
+ switch (get8(s)) {
+ case 0x2C: /* Image Descriptor */
+ {
+ int32 x, y, w, h;
+ uint8 *o;
+
+ x = get16le(s);
+ y = get16le(s);
+ w = get16le(s);
+ h = get16le(s);
+ if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+ return epuc("bad Image Descriptor", "Corrupt GIF");
+
+ g->line_size = g->w * 4;
+ g->start_x = x * 4;
+ g->start_y = y * g->line_size;
+ g->max_x = g->start_x + w * 4;
+ g->max_y = g->start_y + h * g->line_size;
+ g->cur_x = g->start_x;
+ g->cur_y = g->start_y;
+
+ g->lflags = get8(s);
+
+ if (g->lflags & 0x40) {
+ g->step = 8 * g->line_size; // first interlaced spacing
+ g->parse = 3;
+ } else {
+ g->step = g->line_size;
+ g->parse = 0;
+ }
+
+ if (g->lflags & 0x80) {
+ stbi_gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
+ g->color_table = (uint8 *) g->lpal;
+ } else if (g->flags & 0x80) {
+ for (i=0; i < 256; ++i) // @OPTIMIZE: reset only the previous transparent
+ g->pal[i][3] = 255;
+ if (g->transparent >= 0 && (g->eflags & 0x01))
+ g->pal[g->transparent][3] = 0;
+ g->color_table = (uint8 *) g->pal;
+ } else
+ return epuc("missing color table", "Corrupt GIF");
+
+ o = stbi_process_gif_raster(s, g);
+ if (o == NULL) return NULL;
+
+ if (req_comp && req_comp != 4)
+ o = convert_format(o, 4, req_comp, g->w, g->h);
+ return o;
+ }
+
+ case 0x21: // Comment Extension.
+ {
+ int len;
+ if (get8(s) == 0xF9) { // Graphic Control Extension.
+ len = get8(s);
+ if (len == 4) {
+ g->eflags = get8(s);
+ get16le(s); // delay
+ g->transparent = get8(s);
+ } else {
+ skip(s, len);
+ break;
+ }
+ }
+ while ((len = get8(s)) != 0)
+ skip(s, len);
+ break;
+ }
+
+ case 0x3B: // gif stream termination code
+ return (uint8 *) 1;
+
+ default:
+ return epuc("unknown code", "Corrupt GIF");
+ }
+ }
+}
+
+static stbi_uc *stbi_gif_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ uint8 *u = 0;
+ stbi_gif g;
+ memset(&g, 0, sizeof(stbi_gif));
+
+ u = stbi_gif_load_next(s, &g, comp, req_comp);
+ if (u == (void *) 1) u = 0; // end of animated gif marker
+ if (u) {
+ *x = g.w;
+ *y = g.h;
+ }
+
+ return u;
+}
+
+static int stbi_gif_info(stbi *s, int *x, int *y, int *comp)
+{
+ return stbi_gif_info_raw(s,x,y,comp);
+}
+
+
+// *************************************************************************************************
+// Radiance RGBE HDR loader
+// originally by Nicolas Schulz
+#ifndef STBI_NO_HDR
+static int hdr_test(stbi *s)
+{
+ const char *signature = "#?RADIANCE\n";
+ int i;
+ for (i=0; signature[i]; ++i)
+ if (get8(s) != signature[i])
+ return 0;
+ return 1;
+}
+
+static int stbi_hdr_test(stbi* s)
+{
+ int r = hdr_test(s);
+ stbi_rewind(s);
+ return r;
+}
+
+#define HDR_BUFLEN 1024
+static char *hdr_gettoken(stbi *z, char *buffer)
+{
+ int len=0;
+ char c = '\0';
+
+ c = (char) get8(z);
+
+ while (!at_eof(z) && c != '\n') {
+ buffer[len++] = c;
+ if (len == HDR_BUFLEN-1) {
+ // flush to end of line
+ while (!at_eof(z) && get8(z) != '\n')
+ ;
+ break;
+ }
+ c = (char) get8(z);
+ }
+
+ buffer[len] = 0;
+ return buffer;
+}
+
+static void hdr_convert(float *output, stbi_uc *input, int req_comp)
+{
+ if ( input[3] != 0 ) {
+ float f1;
+ // Exponent
+ f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
+ if (req_comp <= 2)
+ output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+ else {
+ output[0] = input[0] * f1;
+ output[1] = input[1] * f1;
+ output[2] = input[2] * f1;
+ }
+ if (req_comp == 2) output[1] = 1;
+ if (req_comp == 4) output[3] = 1;
+ } else {
+ switch (req_comp) {
+ case 4: output[3] = 1; /* fallthrough */
+ case 3: output[0] = output[1] = output[2] = 0;
+ break;
+ case 2: output[1] = 1; /* fallthrough */
+ case 1: output[0] = 0;
+ break;
+ }
+ }
+}
+
+static float *hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ char buffer[HDR_BUFLEN];
+ char *token;
+ int valid = 0;
+ int width, height;
+ stbi_uc *scanline;
+ float *hdr_data;
+ int len;
+ unsigned char count, value;
+ int i, j, k, c1,c2, z;
+
+
+ // Check identifier
+ if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
+ return epf("not HDR", "Corrupt HDR image");
+
+ // Parse header
+ for(;;) {
+ token = hdr_gettoken(s,buffer);
+ if (token[0] == 0) break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+ }
+
+ if (!valid) return epf("unsupported format", "Unsupported HDR format");
+
+ // Parse width and height
+ // can't use sscanf() if we're not using stdio!
+ token = hdr_gettoken(s,buffer);
+ if (strncmp(token, "-Y ", 3)) return epf("unsupported data layout", "Unsupported HDR format");
+ token += 3;
+ height = strtol(token, &token, 10);
+ while (*token == ' ') ++token;
+ if (strncmp(token, "+X ", 3)) return epf("unsupported data layout", "Unsupported HDR format");
+ token += 3;
+ width = strtol(token, NULL, 10);
+
+ *x = width;
+ *y = height;
+
+ *comp = 3;
+ if (req_comp == 0) req_comp = 3;
+
+ // Read data
+ hdr_data = (float *) malloc(height * width * req_comp * sizeof(float));
+
+ // Load image data
+ // image data is stored as some number of sca
+ if ( width < 8 || width >= 32768) {
+ // Read flat data
+ for (j=0; j < height; ++j) {
+ for (i=0; i < width; ++i) {
+ stbi_uc rgbe[4];
+ main_decode_loop:
+ getn(s, rgbe, 4);
+ hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
+ }
+ }
+ } else {
+ // Read RLE-encoded data
+ scanline = NULL;
+
+ for (j = 0; j < height; ++j) {
+ c1 = get8(s);
+ c2 = get8(s);
+ len = get8(s);
+ if (c1 != 2 || c2 != 2 || (len & 0x80)) {
+ // not run-length encoded, so we have to actually use THIS data as a decoded
+ // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
+ uint8 rgbe[4];
+ rgbe[0] = (uint8) c1;
+ rgbe[1] = (uint8) c2;
+ rgbe[2] = (uint8) len;
+ rgbe[3] = (uint8) get8u(s);
+ hdr_convert(hdr_data, rgbe, req_comp);
+ i = 1;
+ j = 0;
+ free(scanline);
+ goto main_decode_loop; // yes, this makes no sense
+ }
+ len <<= 8;
+ len |= get8(s);
+ if (len != width) { free(hdr_data); free(scanline); return epf("invalid decoded scanline length", "corrupt HDR"); }
+ if (scanline == NULL) scanline = (stbi_uc *) malloc(width * 4);
+
+ for (k = 0; k < 4; ++k) {
+ i = 0;
+ while (i < width) {
+ count = get8u(s);
+ if (count > 128) {
+ // Run
+ value = get8u(s);
+ count -= 128;
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = value;
+ } else {
+ // Dump
+ for (z = 0; z < count; ++z)
+ scanline[i++ * 4 + k] = get8u(s);
+ }
+ }
+ }
+ for (i=0; i < width; ++i)
+ hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
+ }
+ free(scanline);
+ }
+
+ return hdr_data;
+}
+
+static float *stbi_hdr_load(stbi *s, int *x, int *y, int *comp, int req_comp)
+{
+ return hdr_load(s,x,y,comp,req_comp);
+}
+
+static int stbi_hdr_info(stbi *s, int *x, int *y, int *comp)
+{
+ char buffer[HDR_BUFLEN];
+ char *token;
+ int valid = 0;
+
+ if (strcmp(hdr_gettoken(s,buffer), "#?RADIANCE") != 0) {
+ stbi_rewind( s );
+ return 0;
+ }
+
+ for(;;) {
+ token = hdr_gettoken(s,buffer);
+ if (token[0] == 0) break;
+ if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+ }
+
+ if (!valid) {
+ stbi_rewind( s );
+ return 0;
+ }
+ token = hdr_gettoken(s,buffer);
+ if (strncmp(token, "-Y ", 3)) {
+ stbi_rewind( s );
+ return 0;
+ }
+ token += 3;
+ *y = strtol(token, &token, 10);
+ while (*token == ' ') ++token;
+ if (strncmp(token, "+X ", 3)) {
+ stbi_rewind( s );
+ return 0;
+ }
+ token += 3;
+ *x = strtol(token, NULL, 10);
+ *comp = 3;
+ return 1;
+}
+#endif // STBI_NO_HDR
+
+static int stbi_bmp_info(stbi *s, int *x, int *y, int *comp)
+{
+ int hsz;
+ if (get8(s) != 'B' || get8(s) != 'M') {
+ stbi_rewind( s );
+ return 0;
+ }
+ skip(s,12);
+ hsz = get32le(s);
+ if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108) {
+ stbi_rewind( s );
+ return 0;
+ }
+ if (hsz == 12) {
+ *x = get16le(s);
+ *y = get16le(s);
+ } else {
+ *x = get32le(s);
+ *y = get32le(s);
+ }
+ if (get16le(s) != 1) {
+ stbi_rewind( s );
+ return 0;
+ }
+ *comp = get16le(s) / 8;
+ return 1;
+}
+
+static int stbi_psd_info(stbi *s, int *x, int *y, int *comp)
+{
+ int channelCount;
+ if (get32(s) != 0x38425053) {
+ stbi_rewind( s );
+ return 0;
+ }
+ if (get16(s) != 1) {
+ stbi_rewind( s );
+ return 0;
+ }
+ skip(s, 6);
+ channelCount = get16(s);
+ if (channelCount < 0 || channelCount > 16) {
+ stbi_rewind( s );
+ return 0;
+ }
+ *y = get32(s);
+ *x = get32(s);
+ if (get16(s) != 8) {
+ stbi_rewind( s );
+ return 0;
+ }
+ if (get16(s) != 3) {
+ stbi_rewind( s );
+ return 0;
+ }
+ *comp = 4;
+ return 1;
+}
+
+static int stbi_pic_info(stbi *s, int *x, int *y, int *comp)
+{
+ int act_comp=0,num_packets=0,chained;
+ pic_packet_t packets[10];
+
+ skip(s, 92);
+
+ *x = get16(s);
+ *y = get16(s);
+ if (at_eof(s)) return 0;
+ if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
+ stbi_rewind( s );
+ return 0;
+ }
+
+ skip(s, 8);
+
+ do {
+ pic_packet_t *packet;
+
+ if (num_packets==sizeof(packets)/sizeof(packets[0]))
+ return 0;
+
+ packet = &packets[num_packets++];
+ chained = get8(s);
+ packet->size = get8u(s);
+ packet->type = get8u(s);
+ packet->channel = get8u(s);
+ act_comp |= packet->channel;
+
+ if (at_eof(s)) {
+ stbi_rewind( s );
+ return 0;
+ }
+ if (packet->size != 8) {
+ stbi_rewind( s );
+ return 0;
+ }
+ } while (chained);
+
+ *comp = (act_comp & 0x10 ? 4 : 3);
+
+ return 1;
+}
+
+static int stbi_info_main(stbi *s, int *x, int *y, int *comp)
+{
+ if (stbi_jpeg_info(s, x, y, comp))
+ return 1;
+ if (stbi_png_info(s, x, y, comp))
+ return 1;
+ if (stbi_gif_info(s, x, y, comp))
+ return 1;
+ if (stbi_bmp_info(s, x, y, comp))
+ return 1;
+ if (stbi_psd_info(s, x, y, comp))
+ return 1;
+ if (stbi_pic_info(s, x, y, comp))
+ return 1;
+ #ifndef STBI_NO_HDR
+ if (stbi_hdr_info(s, x, y, comp))
+ return 1;
+ #endif
+ // test tga last because it's a crappy test!
+ if (stbi_tga_info(s, x, y, comp))
+ return 1;
+ return e("unknown image type", "Image not of any known type, or corrupt");
+}
+
+#ifndef STBI_NO_STDIO
+int stbi_info(char const *filename, int *x, int *y, int *comp)
+{
+ FILE *f = fopen(filename, "rb");
+ int result;
+ if (!f) return e("can't fopen", "Unable to open file");
+ result = stbi_info_from_file(f, x, y, comp);
+ fclose(f);
+ return result;
+}
+
+int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
+{
+ int r;
+ stbi s;
+ long pos = ftell(f);
+ start_file(&s, f);
+ r = stbi_info_main(&s,x,y,comp);
+ fseek(f,pos,SEEK_SET);
+ return r;
+}
+#endif // !STBI_NO_STDIO
+
+int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
+{
+ stbi s;
+ start_mem(&s,buffer,len);
+ return stbi_info_main(&s,x,y,comp);
+}
+
+int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
+{
+ stbi s;
+ start_callbacks(&s, (stbi_io_callbacks *) c, user);
+ return stbi_info_main(&s,x,y,comp);
+}
+
+#endif // STBI_HEADER_FILE_ONLY
+
+/*
+ revision history:
+ 1.33 (2011-07-14)
+ make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements
+ 1.32 (2011-07-13)
+ support for "info" function for all supported filetypes (SpartanJ)
+ 1.31 (2011-06-20)
+ a few more leak fixes, bug in PNG handling (SpartanJ)
+ 1.30 (2011-06-11)
+ added ability to load files via callbacks to accomidate custom input streams (Ben Wenger)
+ removed deprecated format-specific test/load functions
+ removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway
+ error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha)
+ fix inefficiency in decoding 32-bit BMP (David Woo)
+ 1.29 (2010-08-16)
+ various warning fixes from Aurelien Pocheville
+ 1.28 (2010-08-01)
+ fix bug in GIF palette transparency (SpartanJ)
+ 1.27 (2010-08-01)
+ cast-to-uint8 to fix warnings
+ 1.26 (2010-07-24)
+ fix bug in file buffering for PNG reported by SpartanJ
+ 1.25 (2010-07-17)
+ refix trans_data warning (Won Chun)
+ 1.24 (2010-07-12)
+ perf improvements reading from files on platforms with lock-heavy fgetc()
+ minor perf improvements for jpeg
+ deprecated type-specific functions so we'll get feedback if they're needed
+ attempt to fix trans_data warning (Won Chun)
+ 1.23 fixed bug in iPhone support
+ 1.22 (2010-07-10)
+ removed image *writing* support
+ stbi_info support from Jetro Lauha
+ GIF support from Jean-Marc Lienher
+ iPhone PNG-extensions from James Brown
+ warning-fixes from Nicolas Schulz and Janez Zemva (i.e. Janez (U+017D)emva)
+ 1.21 fix use of 'uint8' in header (reported by jon blow)
+ 1.20 added support for Softimage PIC, by Tom Seddon
+ 1.19 bug in interlaced PNG corruption check (found by ryg)
+ 1.18 2008-08-02
+ fix a threading bug (local mutable static)
+ 1.17 support interlaced PNG
+ 1.16 major bugfix - convert_format converted one too many pixels
+ 1.15 initialize some fields for thread safety
+ 1.14 fix threadsafe conversion bug
+ header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+ 1.13 threadsafe
+ 1.12 const qualifiers in the API
+ 1.11 Support installable IDCT, colorspace conversion routines
+ 1.10 Fixes for 64-bit (don't use "unsigned long")
+ optimized upsampling by Fabian "ryg" Giesen
+ 1.09 Fix format-conversion for PSD code (bad global variables!)
+ 1.08 Thatcher Ulrich's PSD code integrated by Nicolas Schulz
+ 1.07 attempt to fix C++ warning/errors again
+ 1.06 attempt to fix C++ warning/errors again
+ 1.05 fix TGA loading to return correct *comp and use good luminance calc
+ 1.04 default float alpha is 1, not 255; use 'void *' for stbi_image_free
+ 1.03 bugfixes to STBI_NO_STDIO, STBI_NO_HDR
+ 1.02 support for (subset of) HDR files, float interface for preferred access to them
+ 1.01 fix bug: possible bug in handling right-side up bmps... not sure
+ fix bug: the stbi_bmp_load() and stbi_tga_load() functions didn't work at all
+ 1.00 interface to zlib that skips zlib header
+ 0.99 correct handling of alpha in palette
+ 0.98 TGA loader by lonesock; dynamically add loaders (untested)
+ 0.97 jpeg errors on too large a file; also catch another malloc failure
+ 0.96 fix detection of invalid v value - particleman@mollyrocket forum
+ 0.95 during header scan, seek to markers in case of padding
+ 0.94 STBI_NO_STDIO to disable stdio usage; rename all #defines the same
+ 0.93 handle jpegtran output; verbose errors
+ 0.92 read 4,8,16,24,32-bit BMP files of several formats
+ 0.91 output 24-bit Windows 3.0 BMP files
+ 0.90 fix a few more warnings; bump version number to approach 1.0
+ 0.61 bugfixes due to Marc LeBlanc, Christopher Lloyd
+ 0.60 fix compiling as c++
+ 0.59 fix warnings: merge Dave Moore's -Wall fixes
+ 0.58 fix bug: zlib uncompressed mode len/nlen was wrong endian
+ 0.57 fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available
+ 0.56 fix bug: zlib uncompressed mode len vs. nlen
+ 0.55 fix bug: restart_interval not initialized to 0
+ 0.54 allow NULL for 'int *comp'
+ 0.53 fix bug in png 3->4; speedup png decoding
+ 0.52 png handles req_comp=3,4 directly; minor cleanup; jpeg comments
+ 0.51 obey req_comp requests, 1-component jpegs return as 1-component,
+ on 'test' only check type, not whether we support this variant
+ 0.50 first released version
+*/
diff --git a/dgl/src/nanovg/stb_truetype.h b/dgl/src/nanovg/stb_truetype.h
@@ -0,0 +1,2064 @@
+// stb_truetype.h - v0.6c - public domain
+// authored from 2009-2012 by Sean Barrett / RAD Game Tools
+//
+// This library processes TrueType files:
+// parse files
+// extract glyph metrics
+// extract glyph shapes
+// render glyphs to one-channel bitmaps with antialiasing (box filter)
+//
+// Todo:
+// non-MS cmaps
+// crashproof on bad data
+// hinting? (no longer patented)
+// cleartype-style AA?
+// optimize: use simple memory allocator for intermediates
+// optimize: build edge-list directly from curves
+// optimize: rasterize directly from curves?
+//
+// ADDITIONAL CONTRIBUTORS
+//
+// Mikko Mononen: compound shape support, more cmap formats
+// Tor Andersson: kerning, subpixel rendering
+//
+// Bug/warning reports:
+// "Zer" on mollyrocket (with fix)
+// Cass Everitt
+// stoiko (Haemimont Games)
+// Brian Hook
+// Walter van Niftrik
+//
+// VERSION HISTORY
+//
+// 0.6c (2012-07-24) improve documentation
+// 0.6b (2012-07-20) fix a few more warnings
+// 0.6 (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
+// stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
+// 0.5 (2011-12-09) bugfixes:
+// subpixel glyph renderer computed wrong bounding box
+// first vertex of shape can be off-curve (FreeSans)
+// 0.4b (2011-12-03) fixed an error in the font baking example
+// 0.4 (2011-12-01) kerning, subpixel rendering (tor)
+// bugfixes for:
+// codepoint-to-glyph conversion using table fmt=12
+// codepoint-to-glyph conversion using table fmt=4
+// stbtt_GetBakedQuad with non-square texture (Zer)
+// updated Hello World! sample to use kerning and subpixel
+// fixed some warnings
+// 0.3 (2009-06-24) cmap fmt=12, compound shapes (MM)
+// userdata, malloc-from-userdata, non-zero fill (STB)
+// 0.2 (2009-03-11) Fix unsigned/signed char warnings
+// 0.1 (2009-03-09) First public release
+//
+// LICENSE
+//
+// This software is in the public domain. Where that dedication is not
+// recognized, you are granted a perpetual, irrevokable license to copy
+// and modify this file as you see fit.
+//
+// USAGE
+//
+// Include this file in whatever places neeed to refer to it. In ONE C/C++
+// file, write:
+// #define STB_TRUETYPE_IMPLEMENTATION
+// before the #include of this file. This expands out the actual
+// implementation into that C/C++ file.
+//
+// Simple 3D API (don't ship this, but it's fine for tools and quick start,
+// and you can cut and paste from it to move to more advanced)
+// stbtt_BakeFontBitmap() -- bake a font to a bitmap for use as texture
+// stbtt_GetBakedQuad() -- compute quad to draw for a given char
+//
+// "Load" a font file from a memory buffer (you have to keep the buffer loaded)
+// stbtt_InitFont()
+// stbtt_GetFontOffsetForIndex() -- use for TTC font collections
+//
+// Render a unicode codepoint to a bitmap
+// stbtt_GetCodepointBitmap() -- allocates and returns a bitmap
+// stbtt_MakeCodepointBitmap() -- renders into bitmap you provide
+// stbtt_GetCodepointBitmapBox() -- how big the bitmap must be
+//
+// Character advance/positioning
+// stbtt_GetCodepointHMetrics()
+// stbtt_GetFontVMetrics()
+// stbtt_GetCodepointKernAdvance()
+//
+// ADDITIONAL DOCUMENTATION
+//
+// Immediately after this block comment are a series of sample programs.
+//
+// After the sample programs is the "header file" section. This section
+// includes documentation for each API function.
+//
+// Some important concepts to understand to use this library:
+//
+// Codepoint
+// Characters are defined by unicode codepoints, e.g. 65 is
+// uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
+// the hiragana for "ma".
+//
+// Glyph
+// A visual character shape (every codepoint is rendered as
+// some glyph)
+//
+// Glyph index
+// A font-specific integer ID representing a glyph
+//
+// Baseline
+// Glyph shapes are defined relative to a baseline, which is the
+// bottom of uppercase characters. Characters extend both above
+// and below the baseline.
+//
+// Current Point
+// As you draw text to the screen, you keep track of a "current point"
+// which is the origin of each character. The current point's vertical
+// position is the baseline. Even "baked fonts" use this model.
+//
+// Vertical Font Metrics
+// The vertical qualities of the font, used to vertically position
+// and space the characters. See docs for stbtt_GetFontVMetrics.
+//
+// Font Size in Pixels or Points
+// The preferred interface for specifying font sizes in stb_truetype
+// is to specify how tall the font's vertical extent should be in pixels.
+// If that sounds good enough, skip the next paragraph.
+//
+// Most font APIs instead use "points", which are a common typographic
+// measurement for describing font size, defined as 72 points per inch.
+// stb_truetype provides a point API for compatibility. However, true
+// "per inch" conventions don't make much sense on computer displays
+// since they different monitors have different number of pixels per
+// inch. For example, Windows traditionally uses a convention that
+// there are 96 pixels per inch, thus making 'inch' measurements have
+// nothing to do with inches, and thus effectively defining a point to
+// be 1.333 pixels. Additionally, the TrueType font data provides
+// an explicit scale factor to scale a given font's glyphs to points,
+// but the author has observed that this scale factor is often wrong
+// for non-commercial fonts, thus making fonts scaled in points
+// according to the TrueType spec incoherently sized in practice.
+//
+// ADVANCED USAGE
+//
+// Quality:
+//
+// - Use the functions with Subpixel at the end to allow your characters
+// to have subpixel positioning. Since the font is anti-aliased, not
+// hinted, this is very import for quality. (This is not possible with
+// baked fonts.)
+//
+// - Kerning is now supported, and if you're supporting subpixel rendering
+// then kerning is worth using to give your text a polished look.
+//
+// Performance:
+//
+// - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
+// if you don't do this, stb_truetype is forced to do the conversion on
+// every call.
+//
+// - There are a lot of memory allocations. We should modify it to take
+// a temp buffer and allocate from the temp buffer (without freeing),
+// should help performance a lot.
+//
+// NOTES
+//
+// The system uses the raw data found in the .ttf file without changing it
+// and without building auxiliary data structures. This is a bit inefficient
+// on little-endian systems (the data is big-endian), but assuming you're
+// caching the bitmaps or glyph shapes this shouldn't be a big deal.
+//
+// It appears to be very hard to programmatically determine what font a
+// given file is in a general way. I provide an API for this, but I don't
+// recommend it.
+//
+//
+// SOURCE STATISTICS (based on v0.6c, 2050 LOC)
+//
+// Documentation & header file 520 LOC \___ 660 LOC documentation
+// Sample code 140 LOC /
+// Truetype parsing 620 LOC ---- 620 LOC TrueType
+// Software rasterization 240 LOC \ .
+// Curve tesselation 120 LOC \__ 550 LOC Bitmap creation
+// Bitmap management 100 LOC /
+// Baked bitmap interface 70 LOC /
+// Font name matching & access 150 LOC ---- 150
+// C runtime library abstraction 60 LOC ---- 60
+
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+//// SAMPLE PROGRAMS
+////
+//
+// Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
+//
+#if 0
+#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
+#include "stb_truetype.h"
+
+char ttf_buffer[1<<20];
+unsigned char temp_bitmap[512*512];
+
+stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
+GLstbtt_uint ftex;
+
+void my_stbtt_initfont(void)
+{
+ fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
+ stbtt_BakeFontBitmap(data,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
+ // can free ttf_buffer at this point
+ glGenTextures(1, &ftex);
+ glBindTexture(GL_TEXTURE_2D, ftex);
+ glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
+ // can free temp_bitmap at this point
+ glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+}
+
+void my_stbtt_print(float x, float y, char *text)
+{
+ // assume orthographic projection with units = screen pixels, origin at top left
+ glBindTexture(GL_TEXTURE_2D, ftex);
+ glBegin(GL_QUADS);
+ while (*text) {
+ if (*text >= 32 && *text < 128) {
+ stbtt_aligned_quad q;
+ stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl,0=old d3d
+ glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
+ glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
+ glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
+ glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
+ }
+ ++text;
+ }
+ glEnd();
+}
+#endif
+//
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program (this compiles): get a single bitmap, print as ASCII art
+//
+#if 0
+#include <stdio.h>
+#define STB_TRUETYPE_IMPLEMENTATION // force following include to generate implementation
+#include "stb_truetype.h"
+
+char ttf_buffer[1<<25];
+
+int main(int argc, char **argv)
+{
+ stbtt_fontinfo font;
+ unsigned char *bitmap;
+ int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
+
+ fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
+
+ stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
+ bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
+
+ for (j=0; j < h; ++j) {
+ for (i=0; i < w; ++i)
+ putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
+ putchar('\n');
+ }
+ return 0;
+}
+#endif
+//
+// Output:
+//
+// .ii.
+// @@@@@@.
+// V@Mio@@o
+// :i. V@V
+// :oM@@M
+// :@@@MM@M
+// @@o o@M
+// :@@. M@M
+// @@@o@@@@
+// :M@@V:@@.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program: print "Hello World!" banner, with bugs
+//
+#if 0
+char buffer[24<<20];
+unsigned char screen[20][79];
+
+int main(int arg, char **argv)
+{
+ stbtt_fontinfo font;
+ int i,j,ascent,baseline,ch=0;
+ float scale, xpos=0;
+ char *text = "Heljo World!";
+
+ fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
+ stbtt_InitFont(&font, buffer, 0);
+
+ scale = stbtt_ScaleForPixelHeight(&font, 15);
+ stbtt_GetFontVMetrics(&font, &ascent,0,0);
+ baseline = (int) (ascent*scale);
+
+ while (text[ch]) {
+ int advance,lsb,x0,y0,x1,y1;
+ float x_shift = xpos - (float) floor(xpos);
+ stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
+ stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
+ stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
+ // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
+ // because this API is really for baking character bitmaps into textures. if you want to render
+ // a sequence of characters, you really need to render each bitmap to a temp buffer, then
+ // "alpha blend" that into the working buffer
+ xpos += (advance * scale);
+ if (text[ch+1])
+ xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
+ ++ch;
+ }
+
+ for (j=0; j < 20; ++j) {
+ for (i=0; i < 78; ++i)
+ putchar(" .:ioVM@"[screen[j][i]>>5]);
+ putchar('\n');
+ }
+
+ return 0;
+}
+#endif
+
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+//// INTEGRATION WITH YOUR CODEBASE
+////
+//// The following sections allow you to supply alternate definitions
+//// of C library functions used by stb_truetype.
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+ // #define your own (u)stbtt_int8/16/32 before including to override this
+ #ifndef stbtt_uint8
+ typedef unsigned char stbtt_uint8;
+ typedef signed char stbtt_int8;
+ typedef unsigned short stbtt_uint16;
+ typedef signed short stbtt_int16;
+ typedef unsigned int stbtt_uint32;
+ typedef signed int stbtt_int32;
+ #endif
+
+ typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
+ typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
+
+ // #define your own STBTT_sort() to override this to avoid qsort
+ #ifndef STBTT_sort
+ #include <stdlib.h>
+ #define STBTT_sort(data,num_items,item_size,compare_func) qsort(data,num_items,item_size,compare_func)
+ #endif
+
+ // #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
+ #ifndef STBTT_ifloor
+ #include <math.h>
+ #define STBTT_ifloor(x) ((int) floor(x))
+ #define STBTT_iceil(x) ((int) ceil(x))
+ #endif
+
+ // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
+ #ifndef STBTT_malloc
+ #include <malloc.h>
+ #define STBTT_malloc(x,u) malloc(x)
+ #define STBTT_free(x,u) free(x)
+ #endif
+
+ #ifndef STBTT_assert
+ #include <assert.h>
+ #define STBTT_assert(x) assert(x)
+ #endif
+
+ #ifndef STBTT_strlen
+ #include <string.h>
+ #define STBTT_strlen(x) strlen(x)
+ #endif
+
+ #ifndef STBTT_memcpy
+ #include <memory.h>
+ #define STBTT_memcpy memcpy
+ #define STBTT_memset memset
+ #endif
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+//// INTERFACE
+////
+////
+
+#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
+#define __STB_INCLUDE_STB_TRUETYPE_H__
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// TEXTURE BAKING API
+//
+// If you use this API, you only have to call two functions ever.
+//
+
+typedef struct
+{
+ unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
+ float xoff,yoff,xadvance;
+} stbtt_bakedchar;
+
+extern int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
+ float pixel_height, // height of font in pixels
+ unsigned char *pixels, int pw, int ph, // bitmap to be filled in
+ int first_char, int num_chars, // characters to bake
+ stbtt_bakedchar *chardata); // you allocate this, it's num_chars long
+// if return is positive, the first unused row of the bitmap
+// if return is negative, returns the negative of the number of characters that fit
+// if return is 0, no characters fit and no rows were used
+// This uses a very crappy packing.
+
+typedef struct
+{
+ float x0,y0,s0,t0; // top-left
+ float x1,y1,s1,t1; // bottom-right
+} stbtt_aligned_quad;
+
+extern void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, // same data as above
+ int char_index, // character to display
+ float *xpos, float *ypos, // pointers to current position in screen pixel space
+ stbtt_aligned_quad *q, // output: quad to draw
+ int opengl_fillrule); // true if opengl fill rule; false if DX9 or earlier
+// Call GetBakedQuad with char_index = 'character - first_char', and it
+// creates the quad you need to draw and advances the current position.
+//
+// The coordinate system used assumes y increases downwards.
+//
+// Characters will extend both above and below the current position;
+// see discussion of "BASELINE" above.
+//
+// It's inefficient; you might want to c&p it and optimize it.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// FONT LOADING
+//
+//
+
+extern int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
+// Each .ttf/.ttc file may have more than one font. Each font has a sequential
+// index number starting from 0. Call this function to get the font offset for
+// a given index; it returns -1 if the index is out of range. A regular .ttf
+// file will only define one font and it always be at offset 0, so it will
+// return '0' for index 0, and -1 for all other indices. You can just skip
+// this step if you know it's that kind of font.
+
+
+// The following structure is defined publically so you can declare one on
+// the stack or as a global or etc, but you should treat it as opaque.
+typedef struct stbtt_fontinfo
+{
+ void * userdata;
+ unsigned char * data; // pointer to .ttf file
+ int fontstart; // offset of start of font
+
+ int numGlyphs; // number of glyphs, needed for range checking
+
+ int loca,head,glyf,hhea,hmtx,kern; // table locations as offset from start of .ttf
+ int index_map; // a cmap mapping for our chosen character encoding
+ int indexToLocFormat; // format needed to map from glyph index to glyph
+} stbtt_fontinfo;
+
+extern int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
+// Given an offset into the file that defines a font, this function builds
+// the necessary cached info for the rest of the system. You must allocate
+// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
+// need to do anything special to free it, because the contents are pure
+// value data with no additional data structures. Returns 0 on failure.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER TO GLYPH-INDEX CONVERSIOn
+
+int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
+// If you're going to perform multiple operations on the same character
+// and you want a speed-up, call this function with the character you're
+// going to process, then use glyph-based functions instead of the
+// codepoint-based functions.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER PROPERTIES
+//
+
+extern float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose "height" is 'pixels' tall.
+// Height is measured as the distance from the highest ascender to the lowest
+// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
+// and computing:
+// scale = pixels / (ascent - descent)
+// so if you prefer to measure height by the ascent only, use a similar calculation.
+
+extern float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose EM size is mapped to
+// 'pixels' tall. This is probably what traditional APIs compute, but
+// I'm not positive.
+
+extern void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
+// ascent is the coordinate above the baseline the font extends; descent
+// is the coordinate below the baseline the font extends (i.e. it is typically negative)
+// lineGap is the spacing between one row's descent and the next row's ascent...
+// so you should advance the vertical position by "*ascent - *descent + *lineGap"
+// these are expressed in unscaled coordinates, so you must multiply by
+// the scale factor for a given size
+
+extern void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
+// the bounding box around all possible characters
+
+extern void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
+// leftSideBearing is the offset from the current horizontal position to the left edge of the character
+// advanceWidth is the offset from the current horizontal position to the next horizontal position
+// these are expressed in unscaled coordinates
+
+extern int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
+// an additional amount to add to the 'advance' value between ch1 and ch2
+// @TODO; for now always returns 0!
+
+extern int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
+// Gets the bounding box of the visible part of the glyph, in unscaled coordinates
+
+extern void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
+extern int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
+extern int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
+// as above, but takes one or more glyph indices for greater efficiency
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// GLYPH SHAPES (you probably don't need these, but they have to go before
+// the bitmaps for C declaration-order reasons)
+//
+
+#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
+ enum {
+ STBTT_vmove=1,
+ STBTT_vline,
+ STBTT_vcurve
+ };
+#endif
+
+#ifndef stbtt_vertex // you can predefine this to use different values
+ // (we share this with other code at RAD)
+ #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
+ typedef struct
+ {
+ stbtt_vertex_type x,y,cx,cy;
+ unsigned char type,padding;
+ } stbtt_vertex;
+#endif
+
+extern int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
+// returns non-zero if nothing is drawn for this glyph
+
+extern int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
+extern int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
+// returns # of vertices and fills *vertices with the pointer to them
+// these are expressed in "unscaled" coordinates
+
+extern void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
+// frees the data allocated above
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// BITMAP RENDERING
+//
+
+extern void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
+// frees the bitmap allocated below
+
+extern unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// allocates a large-enough single-channel 8bpp bitmap and renders the
+// specified character/glyph at the specified scale into it, with
+// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
+// *width & *height are filled out with the width & height of the bitmap,
+// which is stored left-to-right, top-to-bottom.
+//
+// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
+
+extern unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
+// shift for the character
+
+extern void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
+// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
+// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
+// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
+// width and height and positioning info for it first.
+
+extern void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
+// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
+// shift for the character
+
+extern void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// get the bbox of the bitmap centered around the glyph origin; so the
+// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
+// the bitmap top left is (leftSideBearing*scale,iy0).
+// (Note that the bitmap uses y-increases-down, but the shape uses
+// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
+
+extern void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
+// shift for the character
+
+// the following functions are equivalent to the above functions, but operate
+// on glyph indices instead of Unicode codepoints (for efficiency)
+extern unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+extern unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+extern void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
+extern void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
+extern void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+extern void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+
+
+// @TODO: don't expose this structure
+typedef struct
+{
+ int w,h,stride;
+ unsigned char *pixels;
+} stbtt__bitmap;
+
+extern void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata);
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Finding the right font...
+//
+// You should really just solve this offline, keep your own tables
+// of what font is what, and don't try to get it out of the .ttf file.
+// That's because getting it out of the .ttf file is really hard, because
+// the names in the file can appear in many possible encodings, in many
+// possible languages, and e.g. if you need a case-insensitive comparison,
+// the details of that depend on the encoding & language in a complex way
+// (actually underspecified in truetype, but also gigantic).
+//
+// But you can use the provided functions in two possible ways:
+// stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
+// unicode-encoded names to try to find the font you want;
+// you can run this before calling stbtt_InitFont()
+//
+// stbtt_GetFontNameString() lets you get any of the various strings
+// from the file yourself and do your own comparisons on them.
+// You have to have called stbtt_InitFont() first.
+
+
+extern int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
+// returns the offset (not index) of the font that matches, or -1 if none
+// if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
+// if you use any other flag, use a font name like "Arial"; this checks
+// the 'macStyle' header field; i don't know if fonts set this consistently
+#define STBTT_MACSTYLE_DONTCARE 0
+#define STBTT_MACSTYLE_BOLD 1
+#define STBTT_MACSTYLE_ITALIC 2
+#define STBTT_MACSTYLE_UNDERSCORE 4
+#define STBTT_MACSTYLE_NONE 8 // <= not same as 0, this makes us check the bitfield is 0
+
+extern int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
+// returns 1/0 whether the first string interpreted as utf8 is identical to
+// the second string interpreted as big-endian utf16... useful for strings from next func
+
+extern const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
+// returns the string (which may be big-endian double byte, e.g. for unicode)
+// and puts the length in bytes in *length.
+//
+// some of the values for the IDs are below; for more see the truetype spec:
+// http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
+// http://www.microsoft.com/typography/otspec/name.htm
+
+enum { // platformID
+ STBTT_PLATFORM_ID_UNICODE =0,
+ STBTT_PLATFORM_ID_MAC =1,
+ STBTT_PLATFORM_ID_ISO =2,
+ STBTT_PLATFORM_ID_MICROSOFT =3
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
+ STBTT_UNICODE_EID_UNICODE_1_0 =0,
+ STBTT_UNICODE_EID_UNICODE_1_1 =1,
+ STBTT_UNICODE_EID_ISO_10646 =2,
+ STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
+ STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
+ STBTT_MS_EID_SYMBOL =0,
+ STBTT_MS_EID_UNICODE_BMP =1,
+ STBTT_MS_EID_SHIFTJIS =2,
+ STBTT_MS_EID_UNICODE_FULL =10
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
+ STBTT_MAC_EID_ROMAN =0, STBTT_MAC_EID_ARABIC =4,
+ STBTT_MAC_EID_JAPANESE =1, STBTT_MAC_EID_HEBREW =5,
+ STBTT_MAC_EID_CHINESE_TRAD =2, STBTT_MAC_EID_GREEK =6,
+ STBTT_MAC_EID_KOREAN =3, STBTT_MAC_EID_RUSSIAN =7
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
+ // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
+ STBTT_MS_LANG_ENGLISH =0x0409, STBTT_MS_LANG_ITALIAN =0x0410,
+ STBTT_MS_LANG_CHINESE =0x0804, STBTT_MS_LANG_JAPANESE =0x0411,
+ STBTT_MS_LANG_DUTCH =0x0413, STBTT_MS_LANG_KOREAN =0x0412,
+ STBTT_MS_LANG_FRENCH =0x040c, STBTT_MS_LANG_RUSSIAN =0x0419,
+ STBTT_MS_LANG_GERMAN =0x0407, STBTT_MS_LANG_SPANISH =0x0409,
+ STBTT_MS_LANG_HEBREW =0x040d, STBTT_MS_LANG_SWEDISH =0x041D
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MAC
+ STBTT_MAC_LANG_ENGLISH =0 , STBTT_MAC_LANG_JAPANESE =11,
+ STBTT_MAC_LANG_ARABIC =12, STBTT_MAC_LANG_KOREAN =23,
+ STBTT_MAC_LANG_DUTCH =4 , STBTT_MAC_LANG_RUSSIAN =32,
+ STBTT_MAC_LANG_FRENCH =1 , STBTT_MAC_LANG_SPANISH =6 ,
+ STBTT_MAC_LANG_GERMAN =2 , STBTT_MAC_LANG_SWEDISH =5 ,
+ STBTT_MAC_LANG_HEBREW =10, STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
+ STBTT_MAC_LANG_ITALIAN =3 , STBTT_MAC_LANG_CHINESE_TRAD =19
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __STB_INCLUDE_STB_TRUETYPE_H__
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+//// IMPLEMENTATION
+////
+////
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+
+//////////////////////////////////////////////////////////////////////////
+//
+// accessors to parse data from file
+//
+
+// on platforms that don't allow misaligned reads, if we want to allow
+// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE
+
+#define ttBYTE(p) (* (stbtt_uint8 *) (p))
+#define ttCHAR(p) (* (stbtt_int8 *) (p))
+#define ttFixed(p) ttLONG(p)
+
+#if defined(STB_TRUETYPE_BIGENDIAN) && !defined(ALLOW_UNALIGNED_TRUETYPE)
+
+ #define ttUSHORT(p) (* (stbtt_uint16 *) (p))
+ #define ttSHORT(p) (* (stbtt_int16 *) (p))
+ #define ttULONG(p) (* (stbtt_uint32 *) (p))
+ #define ttLONG(p) (* (stbtt_int32 *) (p))
+
+#else
+
+ stbtt_uint16 ttUSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
+ stbtt_int16 ttSHORT(const stbtt_uint8 *p) { return p[0]*256 + p[1]; }
+ stbtt_uint32 ttULONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+ stbtt_int32 ttLONG(const stbtt_uint8 *p) { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+
+#endif
+
+#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
+#define stbtt_tag(p,str) stbtt_tag4(p,str[0],str[1],str[2],str[3])
+
+static int stbtt__isfont(const stbtt_uint8 *font)
+{
+ // check the version number
+ if (stbtt_tag4(font, '1',0,0,0)) return 1; // TrueType 1
+ if (stbtt_tag(font, "typ1")) return 1; // TrueType with type 1 font -- we don't support this!
+ if (stbtt_tag(font, "OTTO")) return 1; // OpenType with CFF
+ if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
+ return 0;
+}
+
+// @OPTIMIZE: binary search
+static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
+{
+ stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
+ stbtt_uint32 tabledir = fontstart + 12;
+ stbtt_int32 i;
+ for (i=0; i < num_tables; ++i) {
+ stbtt_uint32 loc = tabledir + 16*i;
+ if (stbtt_tag(data+loc+0, tag))
+ return ttULONG(data+loc+8);
+ }
+ return 0;
+}
+
+int stbtt_GetFontOffsetForIndex(const unsigned char *font_collection, int index)
+{
+ // if it's just a font, there's only one valid index
+ if (stbtt__isfont(font_collection))
+ return index == 0 ? 0 : -1;
+
+ // check if it's a TTC
+ if (stbtt_tag(font_collection, "ttcf")) {
+ // version 1?
+ if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
+ stbtt_int32 n = ttLONG(font_collection+8);
+ if (index >= n)
+ return -1;
+ return ttULONG(font_collection+12+index*14);
+ }
+ }
+ return -1;
+}
+
+int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data2, int fontstart)
+{
+ stbtt_uint8 *data = (stbtt_uint8 *) data2;
+ stbtt_uint32 cmap, t;
+ stbtt_int32 i,numTables;
+
+ info->data = data;
+ info->fontstart = fontstart;
+
+ cmap = stbtt__find_table(data, fontstart, "cmap"); // required
+ info->loca = stbtt__find_table(data, fontstart, "loca"); // required
+ info->head = stbtt__find_table(data, fontstart, "head"); // required
+ info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
+ info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
+ info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
+ info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
+ if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
+ return 0;
+
+ t = stbtt__find_table(data, fontstart, "maxp");
+ if (t)
+ info->numGlyphs = ttUSHORT(data+t+4);
+ else
+ info->numGlyphs = 0xffff;
+
+ // find a cmap encoding table we understand *now* to avoid searching
+ // later. (todo: could make this installable)
+ // the same regardless of glyph.
+ numTables = ttUSHORT(data + cmap + 2);
+ info->index_map = 0;
+ for (i=0; i < numTables; ++i) {
+ stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
+ // find an encoding we understand:
+ switch(ttUSHORT(data+encoding_record)) {
+ case STBTT_PLATFORM_ID_MICROSOFT:
+ switch (ttUSHORT(data+encoding_record+2)) {
+ case STBTT_MS_EID_UNICODE_BMP:
+ case STBTT_MS_EID_UNICODE_FULL:
+ // MS/Unicode
+ info->index_map = cmap + ttULONG(data+encoding_record+4);
+ break;
+ }
+ break;
+ }
+ }
+ if (info->index_map == 0)
+ return 0;
+
+ info->indexToLocFormat = ttUSHORT(data+info->head + 50);
+ return 1;
+}
+
+int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
+{
+ stbtt_uint8 *data = info->data;
+ stbtt_uint32 index_map = info->index_map;
+
+ stbtt_uint16 format = ttUSHORT(data + index_map + 0);
+ if (format == 0) { // apple byte encoding
+ stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
+ if (unicode_codepoint < bytes-6)
+ return ttBYTE(data + index_map + 6 + unicode_codepoint);
+ return 0;
+ } else if (format == 6) {
+ stbtt_uint32 first = ttUSHORT(data + index_map + 6);
+ stbtt_uint32 count = ttUSHORT(data + index_map + 8);
+ if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
+ return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
+ return 0;
+ } else if (format == 2) {
+ STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
+ return 0;
+ } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
+ stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
+ stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
+ stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
+ stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
+ stbtt_uint16 item, offset, start, end;
+
+ // do a binary search of the segments
+ stbtt_uint32 endCount = index_map + 14;
+ stbtt_uint32 search = endCount;
+
+ if (unicode_codepoint > 0xffff)
+ return 0;
+
+ // they lie from endCount .. endCount + segCount
+ // but searchRange is the nearest power of two, so...
+ if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
+ search += rangeShift*2;
+
+ // now decrement to bias correctly to find smallest
+ search -= 2;
+ while (entrySelector) {
+ searchRange >>= 1;
+ start = ttUSHORT(data + search + 2 + segcount*2 + 2);
+ end = ttUSHORT(data + search + 2);
+ start = ttUSHORT(data + search + searchRange*2 + segcount*2 + 2);
+ end = ttUSHORT(data + search + searchRange*2);
+ if (unicode_codepoint > end)
+ search += searchRange*2;
+ --entrySelector;
+ }
+ search += 2;
+
+ item = (stbtt_uint16) ((search - endCount) >> 1);
+
+ STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
+ start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
+ end = ttUSHORT(data + index_map + 14 + 2 + 2*item);
+ if (unicode_codepoint < start)
+ return 0;
+
+ offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
+ if (offset == 0)
+ return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));
+
+ return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
+ } else if (format == 12 || format == 13) {
+ stbtt_uint32 ngroups = ttULONG(data+index_map+12);
+ stbtt_int32 low,high;
+ low = 0; high = (stbtt_int32)ngroups;
+ // Binary search the right group.
+ while (low < high) {
+ stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
+ stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
+ stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
+ if ((stbtt_uint32) unicode_codepoint < start_char)
+ high = mid;
+ else if ((stbtt_uint32) unicode_codepoint > end_char)
+ low = mid+1;
+ else {
+ stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
+ if (format == 12)
+ return start_glyph + unicode_codepoint-start_char;
+ else // format == 13
+ return start_glyph;
+ }
+ }
+ return 0; // not found
+ }
+ // @TODO
+ STBTT_assert(0);
+ return 0;
+}
+
+int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
+{
+ return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
+}
+
+static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
+{
+ v->type = type;
+ v->x = (stbtt_int16) x;
+ v->y = (stbtt_int16) y;
+ v->cx = (stbtt_int16) cx;
+ v->cy = (stbtt_int16) cy;
+}
+
+static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
+{
+ int g1,g2;
+
+ if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
+ if (info->indexToLocFormat >= 2) return -1; // unknown index->glyph map format
+
+ if (info->indexToLocFormat == 0) {
+ g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
+ g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
+ } else {
+ g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
+ g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
+ }
+
+ return g1==g2 ? -1 : g1; // if length is 0, return -1
+}
+
+int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
+{
+ int g = stbtt__GetGlyfOffset(info, glyph_index);
+ if (g < 0) return 0;
+
+ if (x0) *x0 = ttSHORT(info->data + g + 2);
+ if (y0) *y0 = ttSHORT(info->data + g + 4);
+ if (x1) *x1 = ttSHORT(info->data + g + 6);
+ if (y1) *y1 = ttSHORT(info->data + g + 8);
+ return 1;
+}
+
+int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
+{
+ return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
+}
+
+int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
+{
+ stbtt_int16 numberOfContours;
+ int g = stbtt__GetGlyfOffset(info, glyph_index);
+ if (g < 0) return 1;
+ numberOfContours = ttSHORT(info->data + g);
+ return numberOfContours == 0;
+}
+
+static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
+ stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
+{
+ if (start_off) {
+ if (was_off)
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
+ } else {
+ if (was_off)
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
+ else
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
+ }
+ return num_vertices;
+}
+
+int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+ stbtt_int16 numberOfContours;
+ stbtt_uint8 *endPtsOfContours;
+ stbtt_uint8 *data = info->data;
+ stbtt_vertex *vertices=0;
+ int num_vertices=0;
+ int g = stbtt__GetGlyfOffset(info, glyph_index);
+
+ *pvertices = NULL;
+
+ if (g < 0) return 0;
+
+ numberOfContours = ttSHORT(data + g);
+
+ if (numberOfContours > 0) {
+ stbtt_uint8 flags=0,flagcount;
+ stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
+ stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
+ stbtt_uint8 *points;
+ endPtsOfContours = (data + g + 10);
+ ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
+ points = data + g + 10 + numberOfContours * 2 + 2 + ins;
+
+ n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
+
+ m = n + 2*numberOfContours; // a loose bound on how many vertices we might need
+ vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
+ if (vertices == 0)
+ return 0;
+
+ next_move = 0;
+ flagcount=0;
+
+ // in first pass, we load uninterpreted data into the allocated array
+ // above, shifted to the end of the array so we won't overwrite it when
+ // we create our final data starting from the front
+
+ off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated
+
+ // first load flags
+
+ for (i=0; i < n; ++i) {
+ if (flagcount == 0) {
+ flags = *points++;
+ if (flags & 8)
+ flagcount = *points++;
+ } else
+ --flagcount;
+ vertices[off+i].type = flags;
+ }
+
+ // now load x coordinates
+ x=0;
+ for (i=0; i < n; ++i) {
+ flags = vertices[off+i].type;
+ if (flags & 2) {
+ stbtt_int16 dx = *points++;
+ x += (flags & 16) ? dx : -dx; // ???
+ } else {
+ if (!(flags & 16)) {
+ x = x + (stbtt_int16) (points[0]*256 + points[1]);
+ points += 2;
+ }
+ }
+ vertices[off+i].x = (stbtt_int16) x;
+ }
+
+ // now load y coordinates
+ y=0;
+ for (i=0; i < n; ++i) {
+ flags = vertices[off+i].type;
+ if (flags & 4) {
+ stbtt_int16 dy = *points++;
+ y += (flags & 32) ? dy : -dy; // ???
+ } else {
+ if (!(flags & 32)) {
+ y = y + (stbtt_int16) (points[0]*256 + points[1]);
+ points += 2;
+ }
+ }
+ vertices[off+i].y = (stbtt_int16) y;
+ }
+
+ // now convert them to our format
+ num_vertices=0;
+ sx = sy = cx = cy = scx = scy = 0;
+ for (i=0; i < n; ++i) {
+ flags = vertices[off+i].type;
+ x = (stbtt_int16) vertices[off+i].x;
+ y = (stbtt_int16) vertices[off+i].y;
+
+ if (next_move == i) {
+ if (i != 0)
+ num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+
+ // now start the new one
+ start_off = !(flags & 1);
+ if (start_off) {
+ // if we start off with an off-curve point, then when we need to find a point on the curve
+ // where we can start, and we need to save some state for when we wraparound.
+ scx = x;
+ scy = y;
+ if (!(vertices[off+i+1].type & 1)) {
+ // next point is also a curve point, so interpolate an on-point curve
+ sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
+ sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
+ } else {
+ // otherwise just use the next point as our start point
+ sx = (stbtt_int32) vertices[off+i+1].x;
+ sy = (stbtt_int32) vertices[off+i+1].y;
+ ++i; // we're using point i+1 as the starting point, so skip it
+ }
+ } else {
+ sx = x;
+ sy = y;
+ }
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
+ was_off = 0;
+ next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
+ ++j;
+ } else {
+ if (!(flags & 1)) { // if it's a curve
+ if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
+ cx = x;
+ cy = y;
+ was_off = 1;
+ } else {
+ if (was_off)
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
+ else
+ stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
+ was_off = 0;
+ }
+ }
+ }
+ num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+ } else if (numberOfContours == -1) {
+ // Compound shapes.
+ int more = 1;
+ stbtt_uint8 *comp = data + g + 10;
+ num_vertices = 0;
+ vertices = 0;
+ while (more) {
+ stbtt_uint16 flags, gidx;
+ int comp_num_verts = 0, i;
+ stbtt_vertex *comp_verts = 0, *tmp = 0;
+ float mtx[6] = {1,0,0,1,0,0}, m, n;
+
+ flags = ttSHORT(comp); comp+=2;
+ gidx = ttSHORT(comp); comp+=2;
+
+ if (flags & 2) { // XY values
+ if (flags & 1) { // shorts
+ mtx[4] = ttSHORT(comp); comp+=2;
+ mtx[5] = ttSHORT(comp); comp+=2;
+ } else {
+ mtx[4] = ttCHAR(comp); comp+=1;
+ mtx[5] = ttCHAR(comp); comp+=1;
+ }
+ }
+ else {
+ // @TODO handle matching point
+ STBTT_assert(0);
+ }
+ if (flags & (1<<3)) { // WE_HAVE_A_SCALE
+ mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[1] = mtx[2] = 0;
+ } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
+ mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[1] = mtx[2] = 0;
+ mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+ } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
+ mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
+ mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+ }
+
+ // Find transformation scales.
+ m = (float) sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
+ n = (float) sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
+
+ // Get indexed glyph.
+ comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
+ if (comp_num_verts > 0) {
+ // Transform vertices.
+ for (i = 0; i < comp_num_verts; ++i) {
+ stbtt_vertex* v = &comp_verts[i];
+ stbtt_vertex_type x,y;
+ x=v->x; y=v->y;
+ v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+ v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+ x=v->cx; y=v->cy;
+ v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+ v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+ }
+ // Append vertices.
+ tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
+ if (!tmp) {
+ if (vertices) STBTT_free(vertices, info->userdata);
+ if (comp_verts) STBTT_free(comp_verts, info->userdata);
+ return 0;
+ }
+ if (num_vertices > 0) memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
+ memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
+ if (vertices) STBTT_free(vertices, info->userdata);
+ vertices = tmp;
+ STBTT_free(comp_verts, info->userdata);
+ num_vertices += comp_num_verts;
+ }
+ // More components ?
+ more = flags & (1<<5);
+ }
+ } else if (numberOfContours < 0) {
+ // @TODO other compound variations?
+ STBTT_assert(0);
+ } else {
+ // numberOfCounters == 0, do nothing
+ }
+
+ *pvertices = vertices;
+ return num_vertices;
+}
+
+void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
+{
+ stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
+ if (glyph_index < numOfLongHorMetrics) {
+ if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*glyph_index);
+ if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
+ } else {
+ if (advanceWidth) *advanceWidth = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
+ if (leftSideBearing) *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
+ }
+}
+
+int stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+{
+ stbtt_uint8 *data = info->data + info->kern;
+ stbtt_uint32 needle, straw;
+ int l, r, m;
+
+ // we only look at the first table. it must be 'horizontal' and format 0.
+ if (!info->kern)
+ return 0;
+ if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+ return 0;
+ if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+ return 0;
+
+ l = 0;
+ r = ttUSHORT(data+10) - 1;
+ needle = glyph1 << 16 | glyph2;
+ while (l <= r) {
+ m = (l + r) >> 1;
+ straw = ttULONG(data+18+(m*6)); // note: unaligned read
+ if (needle < straw)
+ r = m - 1;
+ else if (needle > straw)
+ l = m + 1;
+ else
+ return ttSHORT(data+22+(m*6));
+ }
+ return 0;
+}
+
+int stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
+{
+ if (!info->kern) // if no kerning table, don't waste time looking up both codepoint->glyphs
+ return 0;
+ return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
+}
+
+void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
+{
+ stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
+}
+
+void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
+{
+ if (ascent ) *ascent = ttSHORT(info->data+info->hhea + 4);
+ if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
+ if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
+}
+
+void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
+{
+ *x0 = ttSHORT(info->data + info->head + 36);
+ *y0 = ttSHORT(info->data + info->head + 38);
+ *x1 = ttSHORT(info->data + info->head + 40);
+ *y1 = ttSHORT(info->data + info->head + 42);
+}
+
+float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
+{
+ int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
+ return (float) height / fheight;
+}
+
+float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
+{
+ int unitsPerEm = ttUSHORT(info->data + info->head + 18);
+ return pixels / unitsPerEm;
+}
+
+void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
+{
+ STBTT_free(v, info->userdata);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// antialiasing software rasterizer
+//
+
+void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ int x0,y0,x1,y1;
+ if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1))
+ x0=y0=x1=y1=0; // e.g. space character
+ // now move to integral bboxes (treating pixels as little squares, what pixels get touched)?
+ if (ix0) *ix0 = STBTT_ifloor(x0 * scale_x + shift_x);
+ if (iy0) *iy0 = -STBTT_iceil (y1 * scale_y + shift_y);
+ if (ix1) *ix1 = STBTT_iceil (x1 * scale_x + shift_x);
+ if (iy1) *iy1 = -STBTT_ifloor(y0 * scale_y + shift_y);
+}
+void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
+}
+
+void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
+}
+
+void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+ stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
+}
+
+typedef struct stbtt__edge {
+ float x0,y0, x1,y1;
+ int invert;
+} stbtt__edge;
+
+typedef struct stbtt__active_edge
+{
+ int x,dx;
+ float ey;
+ struct stbtt__active_edge *next;
+ int valid;
+} stbtt__active_edge;
+
+#define FIXSHIFT 10
+#define FIX (1 << FIXSHIFT)
+#define FIXMASK (FIX-1)
+
+static stbtt__active_edge *new_active(stbtt__edge *e, int off_x, float start_point, void *userdata)
+{
+ stbtt__active_edge *z = (stbtt__active_edge *) STBTT_malloc(sizeof(*z), userdata); // @TODO: make a pool of these!!!
+ float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
+ STBTT_assert(e->y0 <= start_point);
+ if (!z) return z;
+ // round dx down to avoid going too far
+ if (dxdy < 0)
+ z->dx = -STBTT_ifloor(FIX * -dxdy);
+ else
+ z->dx = STBTT_ifloor(FIX * dxdy);
+ z->x = STBTT_ifloor(FIX * (e->x0 + dxdy * (start_point - e->y0)));
+ z->x -= off_x * FIX;
+ z->ey = e->y1;
+ z->next = 0;
+ z->valid = e->invert ? 1 : -1;
+ return z;
+}
+
+// note: this routine clips fills that extend off the edges... ideally this
+// wouldn't happen, but it could happen if the truetype glyph bounding boxes
+// are wrong, or if the user supplies a too-small bitmap
+static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
+{
+ // non-zero winding fill
+ int x0=0, w=0;
+
+ while (e) {
+ if (w == 0) {
+ // if we're currently at zero, we need to record the edge start point
+ x0 = e->x; w += e->valid;
+ } else {
+ int x1 = e->x; w += e->valid;
+ // if we went to zero, we need to draw
+ if (w == 0) {
+ int i = x0 >> FIXSHIFT;
+ int j = x1 >> FIXSHIFT;
+
+ if (i < len && j >= 0) {
+ if (i == j) {
+ // x0,x1 are the same pixel, so compute combined coverage
+ scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> FIXSHIFT);
+ } else {
+ if (i >= 0) // add antialiasing for x0
+ scanline[i] = scanline[i] + (stbtt_uint8) (((FIX - (x0 & FIXMASK)) * max_weight) >> FIXSHIFT);
+ else
+ i = -1; // clip
+
+ if (j < len) // add antialiasing for x1
+ scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & FIXMASK) * max_weight) >> FIXSHIFT);
+ else
+ j = len; // clip
+
+ for (++i; i < j; ++i) // fill pixels between x0 and x1
+ scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
+ }
+ }
+ }
+ }
+
+ e = e->next;
+ }
+}
+
+static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
+{
+ stbtt__active_edge *active = NULL;
+ int y,j=0;
+ int max_weight = (255 / vsubsample); // weight per vertical scanline
+ int s; // vertical subsample index
+ unsigned char scanline_data[512], *scanline;
+
+ if (result->w > 512)
+ scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
+ else
+ scanline = scanline_data;
+
+ y = off_y * vsubsample;
+ e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;
+
+ while (j < result->h) {
+ STBTT_memset(scanline, 0, result->w);
+ for (s=0; s < vsubsample; ++s) {
+ // find center of pixel for this scanline
+ float scan_y = y + 0.5f;
+ stbtt__active_edge **step = &active;
+
+ // update all active edges;
+ // remove all active edges that terminate before the center of this scanline
+ while (*step) {
+ stbtt__active_edge * z = *step;
+ if (z->ey <= scan_y) {
+ *step = z->next; // delete from list
+ STBTT_assert(z->valid);
+ z->valid = 0;
+ STBTT_free(z, userdata);
+ } else {
+ z->x += z->dx; // advance to position for current scanline
+ step = &((*step)->next); // advance through list
+ }
+ }
+
+ // resort the list if needed
+ for(;;) {
+ int changed=0;
+ step = &active;
+ while (*step && (*step)->next) {
+ if ((*step)->x > (*step)->next->x) {
+ stbtt__active_edge *t = *step;
+ stbtt__active_edge *q = t->next;
+
+ t->next = q->next;
+ q->next = t;
+ *step = q;
+ changed = 1;
+ }
+ step = &(*step)->next;
+ }
+ if (!changed) break;
+ }
+
+ // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
+ while (e->y0 <= scan_y) {
+ if (e->y1 > scan_y) {
+ stbtt__active_edge *z = new_active(e, off_x, scan_y, userdata);
+ // find insertion point
+ if (active == NULL)
+ active = z;
+ else if (z->x < active->x) {
+ // insert at front
+ z->next = active;
+ active = z;
+ } else {
+ // find thing to insert AFTER
+ stbtt__active_edge *p = active;
+ while (p->next && p->next->x < z->x)
+ p = p->next;
+ // at this point, p->next->x is NOT < z->x
+ z->next = p->next;
+ p->next = z;
+ }
+ }
+ ++e;
+ }
+
+ // now process all active edges in XOR fashion
+ if (active)
+ stbtt__fill_active_edges(scanline, result->w, active, max_weight);
+
+ ++y;
+ }
+ STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
+ ++j;
+ }
+
+ while (active) {
+ stbtt__active_edge *z = active;
+ active = active->next;
+ STBTT_free(z, userdata);
+ }
+
+ if (scanline != scanline_data)
+ STBTT_free(scanline, userdata);
+}
+
+static int stbtt__edge_compare(const void *p, const void *q)
+{
+ stbtt__edge *a = (stbtt__edge *) p;
+ stbtt__edge *b = (stbtt__edge *) q;
+
+ if (a->y0 < b->y0) return -1;
+ if (a->y0 > b->y0) return 1;
+ return 0;
+}
+
+typedef struct
+{
+ float x,y;
+} stbtt__point;
+
+static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
+{
+ float y_scale_inv = invert ? -scale_y : scale_y;
+ stbtt__edge *e;
+ int n,i,j,k,m;
+ int vsubsample = result->h < 8 ? 15 : 5;
+ // vsubsample should divide 255 evenly; otherwise we won't reach full opacity
+
+ // now we have to blow out the windings into explicit edge lists
+ n = 0;
+ for (i=0; i < windings; ++i)
+ n += wcount[i];
+
+ e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
+ if (e == 0) return;
+ n = 0;
+
+ m=0;
+ for (i=0; i < windings; ++i) {
+ stbtt__point *p = pts + m;
+ m += wcount[i];
+ j = wcount[i]-1;
+ for (k=0; k < wcount[i]; j=k++) {
+ int a=k,b=j;
+ // skip the edge if horizontal
+ if (p[j].y == p[k].y)
+ continue;
+ // add edge from j to k to the list
+ e[n].invert = 0;
+ if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
+ e[n].invert = 1;
+ a=j,b=k;
+ }
+ e[n].x0 = p[a].x * scale_x + shift_x;
+ e[n].y0 = p[a].y * y_scale_inv * vsubsample + shift_y;
+ e[n].x1 = p[b].x * scale_x + shift_x;
+ e[n].y1 = p[b].y * y_scale_inv * vsubsample + shift_y;
+ ++n;
+ }
+ }
+
+ // now sort the edges by their highest point (should snap to integer, and then by x)
+ STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);
+
+ // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
+ stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);
+
+ STBTT_free(e, userdata);
+}
+
+static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
+{
+ if (!points) return; // during first pass, it's unallocated
+ points[n].x = x;
+ points[n].y = y;
+}
+
+// tesselate until threshhold p is happy... @TODO warped to compensate for non-linear stretching
+static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
+{
+ // midpoint
+ float mx = (x0 + 2*x1 + x2)/4;
+ float my = (y0 + 2*y1 + y2)/4;
+ // versus directly drawn line
+ float dx = (x0+x2)/2 - mx;
+ float dy = (y0+y2)/2 - my;
+ if (n > 16) // 65536 segments on one curve better be enough!
+ return 1;
+ if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
+ stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
+ stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
+ } else {
+ stbtt__add_point(points, *num_points,x2,y2);
+ *num_points = *num_points+1;
+ }
+ return 1;
+}
+
+// returns number of contours
+stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
+{
+ stbtt__point *points=0;
+ int num_points=0;
+
+ float objspace_flatness_squared = objspace_flatness * objspace_flatness;
+ int i,n=0,start=0, pass;
+
+ // count how many "moves" there are to get the contour count
+ for (i=0; i < num_verts; ++i)
+ if (vertices[i].type == STBTT_vmove)
+ ++n;
+
+ *num_contours = n;
+ if (n == 0) return 0;
+
+ *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);
+
+ if (*contour_lengths == 0) {
+ *num_contours = 0;
+ return 0;
+ }
+
+ // make two passes through the points so we don't need to realloc
+ for (pass=0; pass < 2; ++pass) {
+ float x=0,y=0;
+ if (pass == 1) {
+ points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
+ if (points == NULL) goto error;
+ }
+ num_points = 0;
+ n= -1;
+ for (i=0; i < num_verts; ++i) {
+ switch (vertices[i].type) {
+ case STBTT_vmove:
+ // start the next contour
+ if (n >= 0)
+ (*contour_lengths)[n] = num_points - start;
+ ++n;
+ start = num_points;
+
+ x = vertices[i].x, y = vertices[i].y;
+ stbtt__add_point(points, num_points++, x,y);
+ break;
+ case STBTT_vline:
+ x = vertices[i].x, y = vertices[i].y;
+ stbtt__add_point(points, num_points++, x, y);
+ break;
+ case STBTT_vcurve:
+ stbtt__tesselate_curve(points, &num_points, x,y,
+ vertices[i].cx, vertices[i].cy,
+ vertices[i].x, vertices[i].y,
+ objspace_flatness_squared, 0);
+ x = vertices[i].x, y = vertices[i].y;
+ break;
+ }
+ }
+ (*contour_lengths)[n] = num_points - start;
+ }
+
+ return points;
+error:
+ STBTT_free(points, userdata);
+ STBTT_free(*contour_lengths, userdata);
+ *contour_lengths = 0;
+ *num_contours = 0;
+ return NULL;
+}
+
+void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
+{
+ float scale = scale_x > scale_y ? scale_y : scale_x;
+ int winding_count, *winding_lengths;
+ stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
+ if (windings) {
+ stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
+ STBTT_free(winding_lengths, userdata);
+ STBTT_free(windings, userdata);
+ }
+}
+
+void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
+{
+ STBTT_free(bitmap, userdata);
+}
+
+unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+ int ix0,iy0,ix1,iy1;
+ stbtt__bitmap gbm;
+ stbtt_vertex *vertices;
+ int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+
+ if (scale_x == 0) scale_x = scale_y;
+ if (scale_y == 0) {
+ if (scale_x == 0) return NULL;
+ scale_y = scale_x;
+ }
+
+ stbtt_GetGlyphBitmapBox(info, glyph, scale_x, scale_y, &ix0,&iy0,&ix1,&iy1);
+
+ // now we get the size
+ gbm.w = (ix1 - ix0);
+ gbm.h = (iy1 - iy0);
+ gbm.pixels = NULL; // in case we error
+
+ if (width ) *width = gbm.w;
+ if (height) *height = gbm.h;
+ if (xoff ) *xoff = ix0;
+ if (yoff ) *yoff = iy0;
+
+ if (gbm.w && gbm.h) {
+ gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
+ if (gbm.pixels) {
+ gbm.stride = gbm.w;
+
+ stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
+ }
+ }
+ STBTT_free(vertices, info->userdata);
+ return gbm.pixels;
+}
+
+unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+ return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
+}
+
+void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph)
+{
+ int ix0,iy0;
+ stbtt_vertex *vertices;
+ int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+ stbtt__bitmap gbm;
+
+ stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
+ gbm.pixels = output;
+ gbm.w = out_w;
+ gbm.h = out_h;
+ gbm.stride = out_stride;
+
+ if (gbm.w && gbm.h)
+ stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);
+
+ STBTT_free(vertices, info->userdata);
+}
+
+void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph)
+{
+ stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
+}
+
+unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+ return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
+}
+
+void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint)
+{
+ stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
+}
+
+unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+ return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
+}
+
+void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint)
+{
+ stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// bitmap baking
+//
+// This is SUPER-CRAPPY packing to keep source code small
+
+extern int stbtt_BakeFontBitmap(const unsigned char *data, int offset, // font location (use offset=0 for plain .ttf)
+ float pixel_height, // height of font in pixels
+ unsigned char *pixels, int pw, int ph, // bitmap to be filled in
+ int first_char, int num_chars, // characters to bake
+ stbtt_bakedchar *chardata)
+{
+ float scale;
+ int x,y,bottom_y, i;
+ stbtt_fontinfo f;
+ stbtt_InitFont(&f, data, offset);
+ STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+ x=y=1;
+ bottom_y = 1;
+
+ scale = stbtt_ScaleForPixelHeight(&f, pixel_height);
+
+ for (i=0; i < num_chars; ++i) {
+ int advance, lsb, x0,y0,x1,y1,gw,gh;
+ int g = stbtt_FindGlyphIndex(&f, first_char + i);
+ stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
+ stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
+ gw = x1-x0;
+ gh = y1-y0;
+ if (x + gw + 1 >= pw)
+ y = bottom_y, x = 1; // advance to next row
+ if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
+ return -i;
+ STBTT_assert(x+gw < pw);
+ STBTT_assert(y+gh < ph);
+ stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
+ chardata[i].x0 = (stbtt_int16) x;
+ chardata[i].y0 = (stbtt_int16) y;
+ chardata[i].x1 = (stbtt_int16) (x + gw);
+ chardata[i].y1 = (stbtt_int16) (y + gh);
+ chardata[i].xadvance = scale * advance;
+ chardata[i].xoff = (float) x0;
+ chardata[i].yoff = (float) y0;
+ x = x + gw + 2;
+ if (y+gh+2 > bottom_y)
+ bottom_y = y+gh+2;
+ }
+ return bottom_y;
+}
+
+void stbtt_GetBakedQuad(stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
+{
+ float d3d_bias = opengl_fillrule ? 0 : -0.5f;
+ float ipw = 1.0f / pw, iph = 1.0f / ph;
+ stbtt_bakedchar *b = chardata + char_index;
+ int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5);
+ int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5);
+
+ q->x0 = round_x + d3d_bias;
+ q->y0 = round_y + d3d_bias;
+ q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
+ q->y1 = round_y + b->y1 - b->y0 + d3d_bias;
+
+ q->s0 = b->x0 * ipw;
+ q->t0 = b->y0 * iph;
+ q->s1 = b->x1 * ipw;
+ q->t1 = b->y1 * iph;
+
+ *xpos += b->xadvance;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// font name matching -- recommended not to use this
+//
+
+// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
+static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(const stbtt_uint8 *s1, stbtt_int32 len1, const stbtt_uint8 *s2, stbtt_int32 len2)
+{
+ stbtt_int32 i=0;
+
+ // convert utf16 to utf8 and compare the results while converting
+ while (len2) {
+ stbtt_uint16 ch = s2[0]*256 + s2[1];
+ if (ch < 0x80) {
+ if (i >= len1) return -1;
+ if (s1[i++] != ch) return -1;
+ } else if (ch < 0x800) {
+ if (i+1 >= len1) return -1;
+ if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
+ if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
+ } else if (ch >= 0xd800 && ch < 0xdc00) {
+ stbtt_uint32 c;
+ stbtt_uint16 ch2 = s2[2]*256 + s2[3];
+ if (i+3 >= len1) return -1;
+ c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
+ if (s1[i++] != 0xf0 + (c >> 18)) return -1;
+ if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
+ if (s1[i++] != 0x80 + ((c >> 6) & 0x3f)) return -1;
+ if (s1[i++] != 0x80 + ((c ) & 0x3f)) return -1;
+ s2 += 2; // plus another 2 below
+ len2 -= 2;
+ } else if (ch >= 0xdc00 && ch < 0xe000) {
+ return -1;
+ } else {
+ if (i+2 >= len1) return -1;
+ if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
+ if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
+ if (s1[i++] != 0x80 + ((ch ) & 0x3f)) return -1;
+ }
+ s2 += 2;
+ len2 -= 2;
+ }
+ return i;
+}
+
+int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
+{
+ return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((const stbtt_uint8*) s1, len1, (const stbtt_uint8*) s2, len2);
+}
+
+// returns results in whatever encoding you request... but note that 2-byte encodings
+// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
+const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
+{
+ stbtt_int32 i,count,stringOffset;
+ stbtt_uint8 *fc = font->data;
+ stbtt_uint32 offset = font->fontstart;
+ stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
+ if (!nm) return NULL;
+
+ count = ttUSHORT(fc+nm+2);
+ stringOffset = nm + ttUSHORT(fc+nm+4);
+ for (i=0; i < count; ++i) {
+ stbtt_uint32 loc = nm + 6 + 12 * i;
+ if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
+ && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
+ *length = ttUSHORT(fc+loc+8);
+ return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
+ }
+ }
+ return NULL;
+}
+
+static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
+{
+ stbtt_int32 i;
+ stbtt_int32 count = ttUSHORT(fc+nm+2);
+ stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);
+
+ for (i=0; i < count; ++i) {
+ stbtt_uint32 loc = nm + 6 + 12 * i;
+ stbtt_int32 id = ttUSHORT(fc+loc+6);
+ if (id == target_id) {
+ // find the encoding
+ stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);
+
+ // is this a Unicode encoding?
+ if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
+ stbtt_int32 slen = ttUSHORT(fc+loc+8), off = ttUSHORT(fc+loc+10);
+
+ // check if there's a prefix match
+ stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
+ if (matchlen >= 0) {
+ // check for target_id+1 immediately following, with same encoding & language
+ if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
+ stbtt_int32 slen = ttUSHORT(fc+loc+12+8), off = ttUSHORT(fc+loc+12+10);
+ if (slen == 0) {
+ if (matchlen == nlen)
+ return 1;
+ } else if (matchlen < nlen && name[matchlen] == ' ') {
+ ++matchlen;
+ if (stbtt_CompareUTF8toUTF16_bigendian((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
+ return 1;
+ }
+ } else {
+ // if nothing immediately following
+ if (matchlen == nlen)
+ return 1;
+ }
+ }
+ }
+
+ // @TODO handle other encodings
+ }
+ }
+ return 0;
+}
+
+static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
+{
+ stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
+ stbtt_uint32 nm,hd;
+ if (!stbtt__isfont(fc+offset)) return 0;
+
+ // check italics/bold/underline flags in macStyle...
+ if (flags) {
+ hd = stbtt__find_table(fc, offset, "head");
+ if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
+ }
+
+ nm = stbtt__find_table(fc, offset, "name");
+ if (!nm) return 0;
+
+ if (flags) {
+ // if we checked the macStyle flags, then just check the family and ignore the subfamily
+ if (stbtt__matchpair(fc, nm, name, nlen, 16, -1)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 1, -1)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
+ } else {
+ if (stbtt__matchpair(fc, nm, name, nlen, 16, 17)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 1, 2)) return 1;
+ if (stbtt__matchpair(fc, nm, name, nlen, 3, -1)) return 1;
+ }
+
+ return 0;
+}
+
+int stbtt_FindMatchingFont(const unsigned char *font_collection, const char *name_utf8, stbtt_int32 flags)
+{
+ stbtt_int32 i;
+ for (i=0;;++i) {
+ stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
+ if (off < 0) return off;
+ if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
+ return off;
+ }
+}
+
+#endif // STB_TRUETYPE_IMPLEMENTATION
