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- /*
- * jchuff.h
- *
- * This file was part of the Independent JPEG Group's software:
- * Copyright (C) 1991-1997, Thomas G. Lane.
- * It was modified by The libjpeg-turbo Project to include only code relevant
- * to libjpeg-turbo.
- * mozjpeg Modifications:
- * Copyright (C) 2014, Mozilla Corporation.
- * 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;
- /* Expand a Huffman table definition into the derived format */
- EXTERN(void) jpeg_make_c_derived_tbl(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
- (j_compress_ptr cinfo, JHUFF_TBL *htbl, long freq[]);
- EXTERN(void) quantize_trellis
- (j_compress_ptr cinfo, c_derived_tbl *dctbl, c_derived_tbl *actbl, JBLOCKROW coef_blocks, JBLOCKROW src, JDIMENSION num_blocks,
- JQUANT_TBL * qtbl, double *norm_src, double *norm_coef, JCOEF *last_dc_val,
- JBLOCKROW coef_blocks_above, JBLOCKROW src_above);
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