Quake-III-Arena

jcapimin.c (6942B)

---

 /*
  * jcapimin.c
  *
  * Copyright (C) 1994-1995, Thomas G. Lane.
  * This file is part of the Independent JPEG Group's software.
  * For conditions of distribution and use, see the accompanying README file.
  *
  * This file contains application interface code for the compression half
  * of the JPEG library.  These are the "minimum" API routines that may be
  * needed in either the normal full-compression case or the transcoding-only
  * case.
  *
  * Most of the routines intended to be called directly by an application
  * are in this file or in jcapistd.c.  But also see jcparam.c for
  * parameter-setup helper routines, jcomapi.c for routines shared by
  * compression and decompression, and jctrans.c for the transcoding case.
  */
 
 #define JPEG_INTERNALS
 #include "jinclude.h"
 #include "jpeglib.h"
 
 
 /*
  * Initialization of a JPEG compression object.
  * The error manager must already be set up (in case memory manager fails).
  */
 
 GLOBAL void
 jpeg_create_compress (j_compress_ptr cinfo)
 {
   int i;
 
   /* For debugging purposes, zero the whole master structure.
    * But error manager pointer is already there, so save and restore it.
    */
   {
     struct jpeg_error_mgr * err = cinfo->err;
     MEMZERO(cinfo, SIZEOF(struct jpeg_compress_struct));
     cinfo->err = err;
   }
   cinfo->is_decompressor = FALSE;
 
   /* Initialize a memory manager instance for this object */
   jinit_memory_mgr((j_common_ptr) cinfo);
 
   /* Zero out pointers to permanent structures. */
   cinfo->progress = NULL;
   cinfo->dest = NULL;
 
   cinfo->comp_info = NULL;
 
   for (i = 0; i < NUM_QUANT_TBLS; i++)
     cinfo->quant_tbl_ptrs[i] = NULL;
 
   for (i = 0; i < NUM_HUFF_TBLS; i++) {
     cinfo->dc_huff_tbl_ptrs[i] = NULL;
     cinfo->ac_huff_tbl_ptrs[i] = NULL;
   }
 
   cinfo->input_gamma = 1.0;	/* in case application forgets */
 
   /* OK, I'm ready */
   cinfo->global_state = CSTATE_START;
 }
 
 
 /*
  * Destruction of a JPEG compression object
  */
 
 GLOBAL void
 jpeg_destroy_compress (j_compress_ptr cinfo)
 {
   jpeg_destroy((j_common_ptr) cinfo); /* use common routine */
 }
 
 
 /*
  * Abort processing of a JPEG compression operation,
  * but don't destroy the object itself.
  */
 
 GLOBAL void
 jpeg_abort_compress (j_compress_ptr cinfo)
 {
   jpeg_abort((j_common_ptr) cinfo); /* use common routine */
 }
 
 
 /*
  * Forcibly suppress or un-suppress all quantization and Huffman tables.
  * Marks all currently defined tables as already written (if suppress)
  * or not written (if !suppress).  This will control whether they get emitted
  * by a subsequent jpeg_start_compress call.
  *
  * This routine is exported for use by applications that want to produce
  * abbreviated JPEG datastreams.  It logically belongs in jcparam.c, but
  * since it is called by jpeg_start_compress, we put it here --- otherwise
  * jcparam.o would be linked whether the application used it or not.
  */
 
 GLOBAL void
 jpeg_suppress_tables (j_compress_ptr cinfo, boolean suppress)
 {
   int i;
   JQUANT_TBL * qtbl;
   JHUFF_TBL * htbl;
 
   for (i = 0; i < NUM_QUANT_TBLS; i++) {
     if ((qtbl = cinfo->quant_tbl_ptrs[i]) != NULL)
       qtbl->sent_table = suppress;
   }
 
   for (i = 0; i < NUM_HUFF_TBLS; i++) {
     if ((htbl = cinfo->dc_huff_tbl_ptrs[i]) != NULL)
       htbl->sent_table = suppress;
     if ((htbl = cinfo->ac_huff_tbl_ptrs[i]) != NULL)
       htbl->sent_table = suppress;
   }
 }
 
 
 /*
  * Finish JPEG compression.
  *
  * If a multipass operating mode was selected, this may do a great deal of
  * work including most of the actual output.
  */
 
 GLOBAL void
 jpeg_finish_compress (j_compress_ptr cinfo)
 {
   JDIMENSION iMCU_row;
 
   if (cinfo->global_state == CSTATE_SCANNING ||
       cinfo->global_state == CSTATE_RAW_OK) {
     /* Terminate first pass */
     if (cinfo->next_scanline < cinfo->image_height)
       ERREXIT(cinfo, JERR_TOO_LITTLE_DATA);
     (*cinfo->master->finish_pass) (cinfo);
   } else if (cinfo->global_state != CSTATE_WRCOEFS)
     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
   /* Perform any remaining passes */
   while (! cinfo->master->is_last_pass) {
     (*cinfo->master->prepare_for_pass) (cinfo);
     for (iMCU_row = 0; iMCU_row < cinfo->total_iMCU_rows; iMCU_row++) {
       if (cinfo->progress != NULL) {
 	cinfo->progress->pass_counter = (long) iMCU_row;
 	cinfo->progress->pass_limit = (long) cinfo->total_iMCU_rows;
 	(*cinfo->progress->progress_monitor) ((j_common_ptr) cinfo);
       }
       /* We bypass the main controller and invoke coef controller directly;
        * all work is being done from the coefficient buffer.
        */
       if (! (*cinfo->coef->compress_data) (cinfo, (JSAMPIMAGE) NULL))
 	ERREXIT(cinfo, JERR_CANT_SUSPEND);
     }
     (*cinfo->master->finish_pass) (cinfo);
   }
   /* Write EOI, do final cleanup */
   (*cinfo->marker->write_file_trailer) (cinfo);
   (*cinfo->dest->term_destination) (cinfo);
   /* We can use jpeg_abort to release memory and reset global_state */
   jpeg_abort((j_common_ptr) cinfo);
 }
 
 
 /*
  * Write a special marker.
  * This is only recommended for writing COM or APPn markers.
  * Must be called after jpeg_start_compress() and before
  * first call to jpeg_write_scanlines() or jpeg_write_raw_data().
  */
 
 GLOBAL void
 jpeg_write_marker (j_compress_ptr cinfo, int marker,
 		   const JOCTET *dataptr, unsigned int datalen)
 {
   if (cinfo->next_scanline != 0 ||
       (cinfo->global_state != CSTATE_SCANNING &&
        cinfo->global_state != CSTATE_RAW_OK &&
        cinfo->global_state != CSTATE_WRCOEFS))
     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
 
   (*cinfo->marker->write_any_marker) (cinfo, marker, dataptr, datalen);
 }
 
 
 /*
  * Alternate compression function: just write an abbreviated table file.
  * Before calling this, all parameters and a data destination must be set up.
  *
  * To produce a pair of files containing abbreviated tables and abbreviated
  * image data, one would proceed as follows:
  *
  *		initialize JPEG object
  *		set JPEG parameters
  *		set destination to table file
  *		jpeg_write_tables(cinfo);
  *		set destination to image file
  *		jpeg_start_compress(cinfo, FALSE);
  *		write data...
  *		jpeg_finish_compress(cinfo);
  *
  * jpeg_write_tables has the side effect of marking all tables written
  * (same as jpeg_suppress_tables(..., TRUE)).  Thus a subsequent start_compress
  * will not re-emit the tables unless it is passed write_all_tables=TRUE.
  */
 
 GLOBAL void
 jpeg_write_tables (j_compress_ptr cinfo)
 {
   if (cinfo->global_state != CSTATE_START)
     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
 
   /* (Re)initialize error mgr and destination modules */
   (*cinfo->err->reset_error_mgr) ((j_common_ptr) cinfo);
   (*cinfo->dest->init_destination) (cinfo);
   /* Initialize the marker writer ... bit of a crock to do it here. */
   jinit_marker_writer(cinfo);
   /* Write them tables! */
   (*cinfo->marker->write_tables_only) (cinfo);
   /* And clean up. */
   (*cinfo->dest->term_destination) (cinfo);
   /* We can use jpeg_abort to release memory. */
   jpeg_abort((j_common_ptr) cinfo);
 }