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author | tma <tma@edf5b092-35ff-0310-97b2-ce42778d08ea> | 2008-08-21 23:29:09 +0000 |
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committer | tma <tma@edf5b092-35ff-0310-97b2-ce42778d08ea> | 2008-08-21 23:29:09 +0000 |
commit | 2158189d919e58cdccb0a365f8614183905960be (patch) | |
tree | da26ed5fe4c0f8d062ccbf7bbf77ac73f30fa46b /code/jpeg-6b/jchuff.h | |
parent | 128ce8a882ef213fcfe63dcb3106a16ef9fd39b1 (diff) | |
download | ioquake3-aero-2158189d919e58cdccb0a365f8614183905960be.tar.gz ioquake3-aero-2158189d919e58cdccb0a365f8614183905960be.zip |
* Update to jpeg-6b (only a decade old)
git-svn-id: svn://svn.icculus.org/quake3/trunk@1452 edf5b092-35ff-0310-97b2-ce42778d08ea
Diffstat (limited to 'code/jpeg-6b/jchuff.h')
-rw-r--r-- | code/jpeg-6b/jchuff.h | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/code/jpeg-6b/jchuff.h b/code/jpeg-6b/jchuff.h new file mode 100644 index 0000000..a9599fc --- /dev/null +++ b/code/jpeg-6b/jchuff.h @@ -0,0 +1,47 @@ +/* + * jchuff.h + * + * Copyright (C) 1991-1997, 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 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; + +/* Short forms of external names for systems with brain-damaged linkers. */ + +#ifdef NEED_SHORT_EXTERNAL_NAMES +#define jpeg_make_c_derived_tbl jMkCDerived +#define jpeg_gen_optimal_table jGenOptTbl +#endif /* NEED_SHORT_EXTERNAL_NAMES */ + +/* Expand a Huffman table definition into the derived format */ +EXTERN(void) jpeg_make_c_derived_tbl + JPP((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 + JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[])); |