source: golgotha/src/i4/loaders/jpg/jchuff.h @ 80

Last change on this file since 80 was 80, checked in by Sam Hocevar, 12 years ago
  • Adding the Golgotha source code. Not sure what's going to be interesting in there, but since it's all public domain, there's certainly stuff to pick up.
  • Property svn:keywords set to Id
File size: 1.3 KB
Line 
1/*
2 * jchuff.h
3 *
4 * Copyright (C) 1991-1996, Thomas G. Lane.
5 * This file is part of the Independent JPEG Group's software.
6 * For conditions of distribution and use, see the accompanying README file.
7 *
8 * This file contains declarations for Huffman entropy encoding routines
9 * that are shared between the sequential encoder (jchuff.c) and the
10 * progressive encoder (jcphuff.c).  No other modules need to see these.
11 */
12
13/* Derived data constructed for each Huffman table */
14
15typedef struct {
16  unsigned int ehufco[256];     /* code for each symbol */
17  char ehufsi[256];             /* length of code for each symbol */
18  /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
19} c_derived_tbl;
20
21/* Short forms of external names for systems with brain-damaged linkers. */
22
23#ifdef NEED_SHORT_EXTERNAL_NAMES
24#define jpeg_make_c_derived_tbl jMkCDerived
25#define jpeg_gen_optimal_table  jGenOptTbl
26#endif /* NEED_SHORT_EXTERNAL_NAMES */
27
28/* Expand a Huffman table definition into the derived format */
29EXTERN(void) jpeg_make_c_derived_tbl
30        JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, c_derived_tbl ** pdtbl));
31
32/* Generate an optimal table definition given the specified counts */
33EXTERN(void) jpeg_gen_optimal_table
34        JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]));
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