kc3-lang/libjpeg-turbo/jclossy.c

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• Hash : 2e8360e0
  Author :
  Date : 1999-04-27T00:00:00
  

  IJG's JPEG software v6b with lossless JPEG support
  
  Patch obtained from:
  https://sourceforge.net/projects/jpeg/files/ftp.oceana.com
  
  Author date taken from original announcement and timestamp of patch
  tarball:
  https://groups.google.com/g/comp.protocols.dicom/c/rrkP8BxoMRk/m/Ij4dfprggp8J
  

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• jclossy.c

• /*
   * jclossy.c
   *
   * Copyright (C) 1998, Thomas G. Lane.
   * This file is part of the Independent JPEG Group's software.
   * For conditions of distribution and use, see the accompanying README file.
   *
   * This file contains the control logic for the lossy JPEG compressor.
   */
  
  #define JPEG_INTERNALS
  #include "jinclude.h"
  #include "jpeglib.h"
  #include "jlossy.h"
  
  
  /*
   * Initialize for a processing pass.
   */
  
  METHODDEF(void)
  start_pass (j_compress_ptr cinfo, J_BUF_MODE pass_mode)
  {
    j_lossy_c_ptr lossyc = (j_lossy_c_ptr) cinfo->codec;
  
    (*lossyc->fdct_start_pass) (cinfo);
    (*lossyc->coef_start_pass) (cinfo, pass_mode);
  }
  
  
  /*
   * Initialize the lossy compression codec.
   * This is called only once, during master selection.
   */
  
  GLOBAL(void)
  jinit_lossy_c_codec (j_compress_ptr cinfo)
  {
    j_lossy_c_ptr lossyc;
  
    /* Create subobject in permanent pool */
    lossyc = (j_lossy_c_ptr)
      (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
  				SIZEOF(jpeg_lossy_c_codec));
    cinfo->codec = (struct jpeg_c_codec *) lossyc;
  
    /* Initialize sub-modules */
  
    /* Forward DCT */
    jinit_forward_dct(cinfo);
    /* Entropy encoding: either Huffman or arithmetic coding. */
    if (cinfo->arith_code) {
      ERREXIT(cinfo, JERR_ARITH_NOTIMPL);
    } else {
      if (cinfo->process == JPROC_PROGRESSIVE) {
  #ifdef C_PROGRESSIVE_SUPPORTED
        jinit_phuff_encoder(cinfo);
  #else
        ERREXIT(cinfo, JERR_NOT_COMPILED);
  #endif
      } else
        jinit_shuff_encoder(cinfo);
    }
  
    /* Need a full-image coefficient buffer in any multi-pass mode. */
    jinit_c_coef_controller(cinfo,
  			  (boolean) (cinfo->num_scans > 1 ||
  				     cinfo->optimize_coding));
  
    /* Initialize method pointers.
     *
     * Note: entropy_start_pass and entropy_finish_pass are assigned in
     * jcshuff.c or jcphuff.c and compress_data is assigned in jccoefct.c.
     */
    lossyc->pub.start_pass = start_pass;
  }
  

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