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

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• Hash : e69dd40c
  Author :
  Date : 2024-01-23T13:26:41
  

  Reorganize source to make things easier to find
  
  - Move all libjpeg documentation, except for README.ijg, into the doc/
    subdirectory.
  
  - Move the TurboJPEG C API documentation from doc/html/ into
    doc/turbojpeg/.
  
  - Move all C source code and headers into a src/ subdirectory.
  
  - Move turbojpeg-jni.c into the java/ subdirectory.
  
  Referring to #226, there is no ideal solution to this problem.  A
  semantically ideal solution would have involved placing all source code,
  including the SIMD and Java source code, under src/ (or perhaps placing
  C library source code under lib/ and C test program source code under
  test/), all header files under include/, and all documentation under
  doc/.  However:
  
  - To me it makes more sense to have separate top-level directories for
    each language, since the SIMD extensions and the Java API are
    technically optional features.  src/ now contains only the code that
    is relevant to the core C API libraries and associated programs.
  - I didn't want to bury the java/ and simd/ directories or add a level
    of depth to them, since both directories already contain source code
    that is 3-4 levels deep.
  - I would prefer not to separate the header files from the C source
    code, because:
    1. It would be disruptive.  libjpeg and libjpeg-turbo have
       historically placed C source code and headers in the same
       directory, and people who are familiar with both projects (self
       included) are used to looking for the headers in the same directory
       as the C source code.
    2. In terms of how the headers are used internally in libjpeg-turbo,
       the distinction between public and private headers is a bit fuzzy.
  - It didn't make sense to separate the test source code from the library
    source code, since there is not a clear distinction in some cases.
    (For instance, the IJG image I/O functions are used by cjpeg and djpeg
    as well as by the TurboJPEG API.)
  
  This solution is minimally disruptive, since it keeps all C source code
  and headers together and keeps java/ and simd/ as top-level directories.
  It is a bit awkward, because java/ and simd/ technically contain source
  code, even though they are not under src/.  However, other solutions
  would have been more awkward for different reasons.
  
  Closes #226
  

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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, 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 == 16) {
  #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
      } 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 {
        jinit_color_converter(cinfo);
        jinit_downsampler(cinfo);
        jinit_c_prep_controller(cinfo, FALSE /* never need full buffer here */);
      }
    }
  
    if (cinfo->master->lossless) {
  #ifdef C_LOSSLESS_SUPPORTED
      /* Prediction, sample differencing, and point transform */
      if (cinfo->data_precision == 16)
        j16init_lossless_compressor(cinfo);
      else if (cinfo->data_precision == 12)
        j12init_lossless_compressor(cinfo);
      else
        jinit_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 == 16)
        j16init_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
        jinit_c_diff_controller(cinfo, (boolean)(cinfo->num_scans > 1 ||
                                                 cinfo->optimize_coding));
  #else
      ERREXIT(cinfo, JERR_NOT_COMPILED);
  #endif
    } else {
      if (cinfo->data_precision == 16)
        ERREXIT1(cinfo, JERR_BAD_PRECISION, cinfo->data_precision);
      /* Forward DCT */
      if (cinfo->data_precision == 12)
        j12init_forward_dct(cinfo);
      else
        jinit_forward_dct(cinfo);
      /* 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 == 16)
  #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
    else if (cinfo->data_precision == 12)
      j12init_c_main_controller(cinfo, FALSE /* never need full buffer here */);
    else
      jinit_c_main_controller(cinfo, FALSE /* never need full buffer here */);
  
    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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