a6b1bda094
Add extension parameter JFLOAT_TRELLIS_DELTA_DC_WEIGHT that controls how distortion is calculated in DC trellis quantization. The parameter defines weighting between actual distortion of DC and distortion of vertical gradient of DC. By default the parameter is 0.0 and has no effect. Addresses #117
50 lines
1.8 KiB
C
50 lines
1.8 KiB
C
/*
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* jchuff.h
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*
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* This file was part of the Independent JPEG Group's software:
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* Copyright (C) 1991-1997, Thomas G. Lane.
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* It was modified by The libjpeg-turbo Project to include only code relevant
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* to libjpeg-turbo.
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* mozjpeg Modifications:
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* Copyright (C) 2014, Mozilla Corporation.
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* For conditions of distribution and use, see the accompanying README file.
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*
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* This file contains declarations for Huffman entropy encoding routines
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* that are shared between the sequential encoder (jchuff.c) and the
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* progressive encoder (jcphuff.c). No other modules need to see these.
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*/
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/* The legal range of a DCT coefficient is
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* -1024 .. +1023 for 8-bit data;
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* -16384 .. +16383 for 12-bit data.
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* Hence the magnitude should always fit in 10 or 14 bits respectively.
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*/
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#if BITS_IN_JSAMPLE == 8
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#define MAX_COEF_BITS 10
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#else
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#define MAX_COEF_BITS 14
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#endif
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/* Derived data constructed for each Huffman table */
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typedef struct {
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unsigned int ehufco[256]; /* code for each symbol */
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char ehufsi[256]; /* length of code for each symbol */
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/* If no code has been allocated for a symbol S, ehufsi[S] contains 0 */
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} c_derived_tbl;
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/* Expand a Huffman table definition into the derived format */
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EXTERN(void) jpeg_make_c_derived_tbl
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(j_compress_ptr cinfo, boolean isDC, int tblno,
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c_derived_tbl ** pdtbl);
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/* Generate an optimal table definition given the specified counts */
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EXTERN(void) jpeg_gen_optimal_table
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(j_compress_ptr cinfo, JHUFF_TBL * htbl, long freq[]);
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EXTERN(void) quantize_trellis
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(j_compress_ptr cinfo, c_derived_tbl *dctbl, c_derived_tbl *actbl, JBLOCKROW coef_blocks, JBLOCKROW src, JDIMENSION num_blocks,
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JQUANT_TBL * qtbl, double *norm_src, double *norm_coef, JCOEF *last_dc_val,
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JBLOCKROW coef_blocks_above, JBLOCKROW src_above);
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