/* * reserved comment block * DO NOT REMOVE OR ALTER!
*/ /* * 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.
*/
/* Derived data constructed for each Huffman table */
typedefstruct { unsignedint 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. */
/* 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[]));
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