kc3-lang/libjpeg-turbo/src/jcinit.c

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• Hash : 6ec8e41f
  Author :
  Date : 2024-06-13T11:52:13
  

  Handle lossless JPEG images w/2-15 bits per sample
  
  Closes #768
  Closes #769
  

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• src/jcinit.c

• /*
   * jcinit.c
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1991-1997, Thomas G. Lane.
   * Lossless JPEG Modifications:
   * Copyright (C) 1999, Ken Murchison.
   * libjpeg-turbo Modifications:
   * Copyright (C) 2020, 2022, 2024, D. R. Commander.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file contains initialization logic for the JPEG compressor.
   * This routine is in charge of selecting the modules to be executed and
   * making an initialization call to each one.
   *
   * Logically, this code belongs in jcmaster.c.  It's split out because
   * linking this routine implies linking the entire compression library.
   * For a transcoding-only application, we want to be able to use jcmaster.c
   * without linking in the whole library.
   */
  
  #define JPEG_INTERNALS
  #include "jinclude.h"
  #include "jpeglib.h"
  #include "jpegapicomp.h"
  
  
  /*
   * Master selection of compression modules.
   * This is done once at the start of processing an image.  We determine
   * which modules will be used and give them appropriate initialization calls.
   */
  
  GLOBAL(void)
  jinit_compress_master(j_compress_ptr cinfo)
  {
    /* Initialize master control (includes parameter checking/processing) */
    jinit_c_master_control(cinfo, FALSE /* full compression */);
  
    /* Preprocessing */
    if (!cinfo->raw_data_in) {
      if (cinfo->data_precision <= 8) {
        jinit_color_converter(cinfo);
        jinit_downsampler(cinfo);
        jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
      } else if (cinfo->data_precision <= 12) {
        j12init_color_converter(cinfo);
        j12init_downsampler(cinfo);
        j12init_c_prep_controller(cinfo,
                                  FALSE /* never need full buffer here */);
      } else {
  #ifdef C_LOSSLESS_SUPPORTED
        j16init_color_converter(cinfo);
        j16init_downsampler(cinfo);
        j16init_c_prep_controller(cinfo,
                                  FALSE /* never need full buffer here */);
  #else
        ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
  #endif
      }
    }
  
    if (cinfo->master->lossless) {
  #ifdef C_LOSSLESS_SUPPORTED
      /* Prediction, sample differencing, and point transform */
      if (cinfo->data_precision <= 8)
        jinit_lossless_compressor(cinfo);
      else if (cinfo->data_precision <= 12)
        j12init_lossless_compressor(cinfo);
      else
        j16init_lossless_compressor(cinfo);
      /* Entropy encoding: either Huffman or arithmetic coding. */
      if (cinfo->arith_code) {
        ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
      } else {
        jinit_lhuff_encoder(cinfo);
      }
  
      /* Need a full-image difference buffer in any multi-pass mode. */
      if (cinfo->data_precision <= 8)
        jinit_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
                                                 cinfo->optimize_coding));
      else if (cinfo->data_precision <= 12)
        j12init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
                                                   cinfo->optimize_coding));
      else
        j16init_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
                                                   cinfo->optimize_coding));
  #else
      ERREXIT(cinfo, JERR_NOT_COMPILED);
  #endif
    } else {
      /* Forward DCT */
      if (cinfo->data_precision == 8)
        jinit_forward_dct(cinfo);
      else if (cinfo->data_precision == 12)
        j12init_forward_dct(cinfo);
      else
        ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
      /* Entropy encoding: either Huffman or arithmetic coding. */
      if (cinfo->arith_code) {
  #ifdef C_ARITH_CODING_SUPPORTED
        jinit_arith_encoder(cinfo);
  #else
        ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
  #endif
      } else {
        if (cinfo->progressive_mode) {
  #ifdef C_PROGRESSIVE_SUPPORTED
          jinit_phuff_encoder(cinfo);
  #else
          ERREXIT(cinfo, JERR_NOT_COMPILED);
  #endif
        } else
          jinit_huff_encoder(cinfo);
      }
  
      /* Need a full-image coefficient buffer in any multi-pass mode. */
      if (cinfo->data_precision == 12)
        j12init_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
                                                   cinfo->optimize_coding));
      else
        jinit_c_coef_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
                                                 cinfo->optimize_coding));
    }
  
    if (cinfo->data_precision <= 8)
      jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
    else if (cinfo->data_precision <= 12)
      j12init_c_main_controller(cinfo, FALSE /* never need full buffer here */);
    else
  #ifdef C_LOSSLESS_SUPPORTED
      j16init_c_main_controller(cinfo, FALSE /* never need full buffer here */);
  #else
      ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
  #endif
  
    jinit_marker_writer(cinfo);
  
    /* We can now tell the memory manager to allocate virtual arrays. */
    (*cinfo->mem->realize_virt_arrays) ((j_common_ptr)cinfo);
  
    /* Write the datastream header (SOI) immediately.
     * Frame and scan headers are postponed till later.
     * This lets application insert special markers after the SOI.
     */
    (*cinfo->marker->write_file_header) (cinfo);
  }
  

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