1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/libs/libjpeg/jchuff.h	Thu Sep 08 06:28:38 2011 +0300
     1.3 @@ -0,0 +1,47 @@
     1.4 +/*
     1.5 + * jchuff.h
     1.6 + *
     1.7 + * Copyright (C) 1991-1997, Thomas G. Lane.
     1.8 + * This file is part of the Independent JPEG Group's software.
     1.9 + * For conditions of distribution and use, see the accompanying README file.
    1.10 + *
    1.11 + * This file contains declarations for Huffman entropy encoding routines
    1.12 + * that are shared between the sequential encoder (jchuff.c) and the
    1.13 + * progressive encoder (jcphuff.c).  No other modules need to see these.
    1.14 + */
    1.15 +
    1.16 +/* The legal range of a DCT coefficient is
    1.17 + *  -1024 .. +1023  for 8-bit data;
    1.18 + * -16384 .. +16383 for 12-bit data.
    1.19 + * Hence the magnitude should always fit in 10 or 14 bits respectively.
    1.20 + */
    1.21 +
    1.22 +#if BITS_IN_JSAMPLE == 8
    1.23 +#define MAX_COEF_BITS 10
    1.24 +#else
    1.25 +#define MAX_COEF_BITS 14
    1.26 +#endif
    1.27 +
    1.28 +/* Derived data constructed for each Huffman table */
    1.29 +
    1.30 +typedef struct {
    1.31 +  unsigned int ehufco[256];	/* code for each symbol */
    1.32 +  char ehufsi[256];		/* length of code for each symbol */
    1.33 +  /* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
    1.34 +} c_derived_tbl;
    1.35 +
    1.36 +/* Short forms of external names for systems with brain-damaged linkers. */
    1.37 +
    1.38 +#ifdef NEED_SHORT_EXTERNAL_NAMES
    1.39 +#define jpeg_make_c_derived_tbl	jMkCDerived
    1.40 +#define jpeg_gen_optimal_table	jGenOptTbl
    1.41 +#endif /* NEED_SHORT_EXTERNAL_NAMES */
    1.42 +
    1.43 +/* Expand a Huffman table definition into the derived format */
    1.44 +EXTERN(void) jpeg_make_c_derived_tbl
    1.45 +	JPP((j_compress_ptr cinfo, boolean isDC, int tblno,
    1.46 +	     c_derived_tbl ** pdtbl));
    1.47 +
    1.48 +/* Generate an optimal table definition given the specified counts */
    1.49 +EXTERN(void) jpeg_gen_optimal_table
    1.50 +	JPP((j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]));