compiler/libjpeg/main/jcinit.c

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