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annotate libs/libjpeg/jchuff.h @ 2:334d17aed7de

visual studio project files
author John Tsiombikas <nuclear@member.fsf.org>
date Sun, 02 Feb 2014 18:36:38 +0200
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nuclear@0 1 /*
nuclear@0 2 * jchuff.h
nuclear@0 3 *
nuclear@0 4 * Copyright (C) 1991-1997, Thomas G. Lane.
nuclear@0 5 * This file is part of the Independent JPEG Group's software.
nuclear@0 6 * For conditions of distribution and use, see the accompanying README file.
nuclear@0 7 *
nuclear@0 8 * This file contains declarations for Huffman entropy encoding routines
nuclear@0 9 * that are shared between the sequential encoder (jchuff.c) and the
nuclear@0 10 * progressive encoder (jcphuff.c). No other modules need to see these.
nuclear@0 11 */
nuclear@0 12
nuclear@0 13 /* The legal range of a DCT coefficient is
nuclear@0 14 * -1024 .. +1023 for 8-bit data;
nuclear@0 15 * -16384 .. +16383 for 12-bit data.
nuclear@0 16 * Hence the magnitude should always fit in 10 or 14 bits respectively.
nuclear@0 17 */
nuclear@0 18
nuclear@0 19 #if BITS_IN_JSAMPLE == 8
nuclear@0 20 #define MAX_COEF_BITS 10
nuclear@0 21 #else
nuclear@0 22 #define MAX_COEF_BITS 14
nuclear@0 23 #endif
nuclear@0 24
nuclear@0 25 /* Derived data constructed for each Huffman table */
nuclear@0 26
nuclear@0 27 typedef struct {
nuclear@0 28 unsigned int ehufco[256]; /* code for each symbol */
nuclear@0 29 char ehufsi[256]; /* length of code for each symbol */
nuclear@0 30 /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
nuclear@0 31 } c_derived_tbl;
nuclear@0 32
nuclear@0 33 /* Short forms of external names for systems with brain-damaged linkers. */
nuclear@0 34
nuclear@0 35 #ifdef NEED_SHORT_EXTERNAL_NAMES
nuclear@0 36 #define jpeg_make_c_derived_tbl jMkCDerived
nuclear@0 37 #define jpeg_gen_optimal_table jGenOptTbl
nuclear@0 38 #endif /* NEED_SHORT_EXTERNAL_NAMES */
nuclear@0 39
nuclear@0 40 /* Expand a Huffman table definition into the derived format */
nuclear@0 41 EXTERN(void) jpeg_make_c_derived_tbl
nuclear@0 42 JPP((j_compress_ptr cinfo, boolean isDC, int tblno,
nuclear@0 43 c_derived_tbl ** pdtbl));
nuclear@0 44
nuclear@0 45 /* Generate an optimal table definition given the specified counts */
nuclear@0 46 EXTERN(void) jpeg_gen_optimal_table
nuclear@0 47 JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]));