media/libjpeg/jcinit.c

   1 /*
   2  * jcinit.c
   3  *
   4  * This file was part of the Independent JPEG Group's software:
   5  * Copyright (C) 1991-1997, Thomas G. Lane.
   6  * Lossless JPEG Modifications:
   7  * Copyright (C) 1999, Ken Murchison.
   8  * libjpeg-turbo Modifications:
   9  * Copyright (C) 2020, 2022, D. R. Commander.
  10  * For conditions of distribution and use, see the accompanying README.ijg
  11  * file.
  12  *
  13  * This file contains initialization logic for the JPEG compressor.
  14  * This routine is in charge of selecting the modules to be executed and
  15  * making an initialization call to each one.
  16  *
  17  * Logically, this code belongs in jcmaster.c.  It's split out because
  18  * linking this routine implies linking the entire compression library.
  19  * For a transcoding-only application, we want to be able to use jcmaster.c
  20  * without linking in the whole library.
  21  */
  22
  23 #define JPEG_INTERNALS
  24 #include "jinclude.h"
  25 #include "jpeglib.h"
  26 #include "jpegapicomp.h"
  27
  28
  29 /*
  30  * Master selection of compression modules.
  31  * This is done once at the start of processing an image.  We determine
  32  * which modules will be used and give them appropriate initialization calls.
  33  */
  34
  35 GLOBAL(void)
  36 jinit_compress_master(j_compress_ptr cinfo)
  37 {
  38   /* Initialize master control (includes parameter checking/processing) */
  39   jinit_c_master_control(cinfo, FALSE /* full compression */);
  40
  41   /* Preprocessing */
  42   if (!cinfo->raw_data_in) {
  43     if (cinfo->data_precision == 16) {
  44 #ifdef C_LOSSLESS_SUPPORTED
  45       j16init_color_converter(cinfo);
  46       j16init_downsampler(cinfo);
  47       j16init_c_prep_controller(cinfo,
  48                                 FALSE /* never need full buffer here */);
  49 #else
  50       ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
  51 #endif
  52     } else if (cinfo->data_precision == 12) {
  53       j12init_color_converter(cinfo);
  54       j12init_downsampler(cinfo);
  55       j12init_c_prep_controller(cinfo,
  56                                 FALSE /* never need full buffer here */);
  57     } else {
  58       jinit_color_converter(cinfo);
  59       jinit_downsampler(cinfo);
  60       jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
  61     }
  62   }
  63
  64   if (cinfo->master->lossless) {
  65 #ifdef C_LOSSLESS_SUPPORTED
  66     /* Prediction, sample differencing, and point transform */
  67     if (cinfo->data_precision == 16)
  68       j16init_lossless_compressor(cinfo);
  69     else if (cinfo->data_precision == 12)
  70       j12init_lossless_compressor(cinfo);
  71     else
  72       jinit_lossless_compressor(cinfo);
  73     /* Entropy encoding: either Huffman or arithmetic coding. */
  74     if (cinfo->arith_code) {
  75       ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
  76     } else {
  77       jinit_lhuff_encoder(cinfo);
  78     }
  79
  80     /* Need a full-image difference buffer in any multi-pass mode. */
  81     if (cinfo->data_precision == 16)
  82       j16init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
  83                                                  cinfo->optimize_coding));
  84     else if (cinfo->data_precision == 12)
  85       j12init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
  86                                                  cinfo->optimize_coding));
  87     else
  88       jinit_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
  89                                                cinfo->optimize_coding));
  90 #else
  91     ERREXIT(cinfo, JERR_NOT_COMPILED);
  92 #endif
  93   } else {
  94     if (cinfo->data_precision == 16)
  95       ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
  96     /* Forward DCT */
  97     if (cinfo->data_precision == 12)
  98       j12init_forward_dct(cinfo);
  99     else
 100       jinit_forward_dct(cinfo);
 101     /* Entropy encoding: either Huffman or arithmetic coding. */
 102     if (cinfo->arith_code) {
 103 #ifdef C_ARITH_CODING_SUPPORTED
 104       jinit_arith_encoder(cinfo);
 105 #else
 106       ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
 107 #endif
 108     } else {
 109       if (cinfo->progressive_mode) {
 110 #ifdef C_PROGRESSIVE_SUPPORTED
 111         jinit_phuff_encoder(cinfo);
 112 #else
 113         ERREXIT(cinfo, JERR_NOT_COMPILED);
 114 #endif
 115       } else
 116         jinit_huff_encoder(cinfo);
 117     }
 118
 119     /* Need a full-image coefficient buffer in any multi-pass mode. */
 120     if (cinfo->data_precision == 12)
 121       j12init_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
 122                                                  cinfo->optimize_coding));
 123     else
 124       jinit_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
 125                                                cinfo->optimize_coding));
 126   }
 127
 128   if (cinfo->data_precision == 16)
 129 #ifdef C_LOSSLESS_SUPPORTED
 130     j16init_c_main_controller(cinfo, FALSE /* never need full buffer here */);
 131 #else
 132     ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
 133 #endif
 134   else if (cinfo->data_precision == 12)
 135     j12init_c_main_controller(cinfo, FALSE /* never need full buffer here */);
 136   else
 137     jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
 138
 139   jinit_marker_writer(cinfo);
 140
 141   /* We can now tell the memory manager to allocate virtual arrays. */
 142   (*cinfo->mem->realize_virt_arrays) ((j_common_ptr)cinfo);
 143
 144   /* Write the datastream header (SOI) immediately.
 145    * Frame and scan headers are postponed till later.
 146    * This lets application insert special markers after the SOI.
 147    */
 148   (*cinfo->marker->write_file_header) (cinfo);
 149 }