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  1. /*
  2.  * jcinit.c
  3.  *
  4.  * Copyright (C) 1991-1997, Thomas G. Lane.
  5.  * This file is part of the Independent JPEG Group's software.
  6.  * For conditions of distribution and use, see the accompanying README file.
  7.  *
  8.  * This file contains initialization logic for the JPEG compressor.
  9.  * This routine is in charge of selecting the modules to be executed and
  10.  * making an initialization call to each one.
  11.  *
  12.  * Logically, this code belongs in jcmaster.c.  It's split out because
  13.  * linking this routine implies linking the entire compression library.
  14.  * For a transcoding-only application, we want to be able to use jcmaster.c
  15.  * without linking in the whole library.
  16.  */
  17.  
  18. #define JPEG_INTERNALS
  19. #include "jinclude.h"
  20. #include "jpeglib.h"
  21.  
  22.  
  23. /*
  24.  * Master selection of compression modules.
  25.  * This is done once at the start of processing an image.  We determine
  26.  * which modules will be used and give them appropriate initialization calls.
  27.  */
  28.  
  29. GLOBAL(void)
  30. jinit_compress_master (j_compress_ptr cinfo)
  31. {
  32.   /* Initialize master control (includes parameter checking/processing) */
  33.   jinit_c_master_control(cinfo, FALSE /* full compression */);
  34.  
  35.   /* Preprocessing */
  36.   if (! cinfo->raw_data_in) {
  37.     jinit_color_converter(cinfo);
  38.     jinit_downsampler(cinfo);
  39.     jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
  40.   }
  41.   /* Forward DCT */
  42.   jinit_forward_dct(cinfo);
  43.   /* Entropy encoding: either Huffman or arithmetic coding. */
  44.   if (cinfo->arith_code) {
  45.     ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
  46.   } else {
  47.     if (cinfo->progressive_mode) {
  48. #ifdef C_PROGRESSIVE_SUPPORTED
  49.       jinit_phuff_encoder(cinfo);
  50. #else
  51.       ERREXIT(cinfo, JERR_NOT_COMPILED);
  52. #endif
  53.     } else
  54.       jinit_huff_encoder(cinfo);
  55.   }
  56.  
  57.   /* Need a full-image coefficient buffer in any multi-pass mode. */
  58.   jinit_c_coef_controller(cinfo,
  59.                 (boolean) (cinfo->num_scans > 1 || cinfo->optimize_coding));
  60.   jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
  61.  
  62.   jinit_marker_writer(cinfo);
  63.  
  64.   /* We can now tell the memory manager to allocate virtual arrays. */
  65.   (*cinfo->mem->realize_virt_arrays) ((j_common_ptr) cinfo);
  66.  
  67.   /* Write the datastream header (SOI) immediately.
  68.    * Frame and scan headers are postponed till later.
  69.    * This lets application insert special markers after the SOI.
  70.    */
  71.   (*cinfo->marker->write_file_header) (cinfo);
  72. }
  73.