• Alexander Alekhin's avatar
    3rdparty: added libjpeg-turbo source code (1.5.3) · 77795392
    Alexander Alekhin authored
    Repo: https://github.com/libjpeg-turbo/libjpeg-turbo.git
    Tag: 1.5.3
    
    excluded libjpeg-turbo files:
    - bmp.c
    - bmp.h
    - cderror.h
    - cdjpeg.c
    - cdjpeg.h
    - cjpeg.c
    - djpeg.c
    - example.c
    - jcstest.c
    - jdatadst-tj.c
    - jdatasrc-tj.c
    - jpegtran.c
    - rdbmp.c
    - rdcolmap.c
    - rdgif.c
    - rdjpgcom.c
    - rdppm.c
    - rdrle.c
    - rdswitch.c
    - rdtarga.c
    - tjbench.c
    - tjunittest.c
    - tjutil.c
    - tjutil.h
    - transupp.c
    - transupp.h
    - turbojpeg-jni.c
    - turbojpeg.c
    - turbojpeg.h
    - wrbmp.c
    - wrgif.c
    - wrjpgcom.c
    - wrppm.c
    - wrrle.c
    - wrtarga.c
    77795392
jchuff.h 1.43 KB
/*
 * 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[]);