kc3-lang/libjpeg-turbo/jchuff.h

• Show log

  Commit

• Hash : 7e3acc0e
  Author :
  Date : 2015-10-10T10:25:46
  

  Rename README, LICENSE, BUILDING text files
  
  The IJG README file has been renamed to README.ijg, in order to avoid
  confusion (many people were assuming that that was our project's README
  file and weren't reading README-turbo.txt) and to lay the groundwork for
  markdown versions of the libjpeg-turbo README and build instructions.
  

Download

• jchuff.h

• /*
   * jchuff.h
   *
   * This file was part of the Independent JPEG Group's software:
   * Copyright (C) 1991-1997, Thomas G. Lane.
   * It was modified by The libjpeg-turbo Project to include only code relevant
   * to libjpeg-turbo.
   * For conditions of distribution and use, see the accompanying README.ijg
   * file.
   *
   * This file contains declarations for Huffman entropy encoding routines
   * that are shared between the sequential encoder (jchuff.c) and the
   * progressive encoder (jcphuff.c).  No other modules need to see these.
   */
  
  /* The legal range of a DCT coefficient is
   *  -1024 .. +1023  for 8-bit data;
   * -16384 .. +16383 for 12-bit data.
   * Hence the magnitude should always fit in 10 or 14 bits respectively.
   */
  
  #if BITS_IN_JSAMPLE == 8
  #define MAX_COEF_BITS 10
  #else
  #define MAX_COEF_BITS 14
  #endif
  
  /* Derived data constructed for each Huffman table */
  
  typedef struct {
    unsigned int ehufco[256];     /* code for each symbol */
    char ehufsi[256];             /* length of code for each symbol */
    /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
  } c_derived_tbl;
  
  /* Expand a Huffman table definition into the derived format */
  EXTERN(void) jpeg_make_c_derived_tbl
          (j_compress_ptr cinfo, boolean isDC, int tblno,
           c_derived_tbl ** pdtbl);
  
  /* Generate an optimal table definition given the specified counts */
  EXTERN(void) jpeg_gen_optimal_table
          (j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]);
  

Download