Quake-III-Arena

Quake III Arena GPL Source Release
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CGMouseDeltaFix.m (5304B)

      1 /*
      2 ===========================================================================
      3 Copyright (C) 1999-2005 Id Software, Inc.
      4 
      5 This file is part of Quake III Arena source code.
      6 
      7 Quake III Arena source code is free software; you can redistribute it
      8 and/or modify it under the terms of the GNU General Public License as
      9 published by the Free Software Foundation; either version 2 of the License,
     10 or (at your option) any later version.
     11 
     12 Quake III Arena source code is distributed in the hope that it will be
     13 useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
     14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     15 GNU General Public License for more details.
     16 
     17 You should have received a copy of the GNU General Public License
     18 along with Foobar; if not, write to the Free Software
     19 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
     20 ===========================================================================
     21 */
     22 #import "CGMouseDeltaFix.h"
     23 #import "CGPrivateAPI.h"
     24 
     25 #import <Foundation/Foundation.h>
     26 #import <mach-o/dyld.h>
     27 
     28 
     29 // We will try to automatically fall back to using the original CGGetLastMouseDelta when we are on a system new enough to have the fix.  Any version of CoreGraphics past 1.93.0 will have the fixed version.
     30 
     31 
     32 static BOOL originalVersionShouldWork = YES;
     33 static CGMouseDelta CGFix_Mouse_DeltaX, CGFix_Mouse_DeltaY;
     34 
     35 static void CGFix_NotificationCallback(CGSNotificationType note, CGSNotificationData data, CGSByteCount dataLength, CGSNotificationArg arg);
     36 
     37 static CGSRegisterNotifyProcType registerNotifyProc = NULL;
     38 
     39 void CGFix_Initialize()
     40 {
     41     NSAutoreleasePool *pool;
     42     NSBundle *cgBundle;
     43     NSString *version;
     44     NSArray *components;
     45     
     46     if (registerNotifyProc)
     47         // We've already been called once and have registered our callbacks.  If the original version works, this will be NULL, but we'll end up doing nothing (again, possibly).
     48         return;
     49 
     50     //NSLog(@"CGFix_Initialize\n");
     51         
     52     pool = [[NSAutoreleasePool alloc] init];
     53     cgBundle = [NSBundle bundleWithPath: @"/System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework"];
     54     if (!cgBundle) {
     55         // If it's moved, it must be newer than what we know about and should work
     56         //NSLog(@"No /System/Library/Frameworks/ApplicationServices.framework/Frameworks/CoreGraphics.framework\n");
     57         goto done;
     58     }
     59     
     60     version = [[cgBundle infoDictionary] objectForKey: @"CFBundleShortVersionString"];
     61     components = [version componentsSeparatedByString: @"."];
     62     //NSLog(@"version = %@\n", version);
     63     //NSLog(@"components = %@\n", components);
     64 
     65 
     66     if ([components count] < 2)
     67         // We don't understand this versioning scheme.  Must have changed.
     68         goto done;
     69     
     70     if (![[components objectAtIndex: 0] isEqualToString: @"1"] || [[components objectAtIndex: 1] intValue] > 93)
     71         // This version should be new enough to work
     72         goto done;
     73     
     74     // Look up the function pointer we need to register our callback.
     75     if (!NSIsSymbolNameDefined("_CGSRegisterNotifyProc")) {
     76         //NSLog(@"No _CGSRegisterNotifyProc\n");
     77         goto done;
     78     }
     79     
     80     registerNotifyProc = NSAddressOfSymbol(NSLookupAndBindSymbol("_CGSRegisterNotifyProc"));
     81     //NSLog(@"registerNotifyProc = 0x%08x", registerNotifyProc);
     82 
     83     // Must not work if we got here
     84     originalVersionShouldWork = NO;
     85     
     86     // We want to catch all the events that could possible indicate mouse movement and sum them up
     87     registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationMouseMoved, NULL);
     88     registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationLeftMouseDragged, NULL);
     89     registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationRightMouseDragged, NULL);
     90     registerNotifyProc( CGFix_NotificationCallback, kCGSEventNotificationNotificationOtherMouseDragged, NULL);
     91     
     92 done:
     93     [pool release];
     94 }
     95 
     96 void CGFix_GetLastMouseDelta(CGMouseDelta *dx, CGMouseDelta *dy)
     97 {
     98     if (originalVersionShouldWork) {
     99         CGGetLastMouseDelta(dx, dy);
    100         return;
    101     }
    102     
    103     *dx = CGFix_Mouse_DeltaX;
    104     *dy = CGFix_Mouse_DeltaY;
    105     
    106     CGFix_Mouse_DeltaX = CGFix_Mouse_DeltaY = 0;
    107 }
    108 
    109 static void CGFix_NotificationCallback(CGSNotificationType note, CGSNotificationData data, CGSByteCount dataLength, CGSNotificationArg arg)
    110 {
    111     CGSEventRecordPtr event;
    112 
    113     //fprintf(stderr, "CGFix_NotificationCallback(note=%d, date=0x%08x, dataLength=%d, arg=0x%08x)\n", note, data, dataLength, arg);
    114     
    115 #ifdef DEBUG
    116     if ((note != kCGSEventNotificationMouseMoved && 
    117          note != kCGSEventNotificationLeftMouseDragged &&
    118          note != kCGSEventNotificationRightMouseDragged &&
    119          note != kCGSEventNotificationNotificationOtherMouseDragged) ||
    120          dataLength != sizeof (CGSEventRecord))
    121          fprintf(stderr, "Unexpected arguments to callback function CGFix_NotificationCallback(note=%d, date=0x%08x, dataLength=%d, arg=0x%08x)\n", note, data, dataLength, arg);
    122          abort();
    123     }
    124 #endif
    125 
    126     event = (CGSEventRecordPtr)data;
    127 
    128     CGFix_Mouse_DeltaX += event->data.move.deltaX;
    129     CGFix_Mouse_DeltaY += event->data.move.deltaY;
    130     //fprintf(stderr, "  dx += %d, dy += %d\n", event->data.move.deltaX, event->data.move.deltaY);
    131 }