992 lines
33 KiB
C
992 lines
33 KiB
C
/*
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* jcparam.c
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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) 1991-1998, Thomas G. Lane.
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* Modified 2003-2008 by Guido Vollbeding.
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* libjpeg-turbo Modifications:
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* Copyright (C) 2009-2011, 2018, D. R. Commander.
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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 optional default-setting code for the JPEG compressor.
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* Applications do not have to use this file, but those that don't use it
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* must know a lot more about the innards of the JPEG code.
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*/
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#define JPEG_INTERNALS
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#include "jinclude.h"
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#include "jpeglib.h"
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#include "jstdhuff.c"
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/*
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* Quantization table setup routines
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*/
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GLOBAL(void)
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jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
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const unsigned int *basic_table, int scale_factor,
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boolean force_baseline)
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/* Define a quantization table equal to the basic_table times
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* a scale factor (given as a percentage).
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* If force_baseline is TRUE, the computed quantization table entries
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* are limited to 1..255 for JPEG baseline compatibility.
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*/
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{
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JQUANT_TBL **qtblptr;
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int i;
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long temp;
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/* Safety check to ensure start_compress not called yet. */
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if (cinfo->global_state != CSTATE_START)
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ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
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if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
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ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
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qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
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if (*qtblptr == NULL)
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*qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
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for (i = 0; i < DCTSIZE2; i++) {
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temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
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/* limit the values to the valid range */
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if (temp <= 0L) temp = 1L;
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if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
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if (force_baseline && temp > 255L)
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temp = 255L; /* limit to baseline range if requested */
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(*qtblptr)->quantval[i] = (UINT16) temp;
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}
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/* Initialize sent_table FALSE so table will be written to JPEG file. */
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(*qtblptr)->sent_table = FALSE;
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}
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/* These are the sample quantization tables given in Annex K (Clause K.1) of
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* Recommendation ITU-T T.81 (1992) | ISO/IEC 10918-1:1994.
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* The spec says that the values given produce "good" quality, and
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* when divided by 2, "very good" quality.
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*/
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static const unsigned int std_luminance_quant_tbl[9][DCTSIZE2] = {
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{
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/* JPEG Annex K
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*/
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16, 11, 10, 16, 24, 40, 51, 61,
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12, 12, 14, 19, 26, 58, 60, 55,
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14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62,
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18, 22, 37, 56, 68, 109, 103, 77,
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24, 35, 55, 64, 81, 104, 113, 92,
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49, 64, 78, 87, 103, 121, 120, 101,
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72, 92, 95, 98, 112, 100, 103, 99
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},
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{
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/* flat
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*/
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16
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},
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{
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12, 17, 20, 21, 30, 34, 56, 63,
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18, 20, 20, 26, 28, 51, 61, 55,
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19, 20, 21, 26, 33, 58, 69, 55,
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26, 26, 26, 30, 46, 87, 86, 66,
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31, 33, 36, 40, 46, 96, 100, 73,
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40, 35, 46, 62, 81, 100, 111, 91,
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46, 66, 76, 86, 102, 121, 120, 101,
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68, 90, 90, 96, 113, 102, 105, 103
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},
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{
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/* From http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20333&p=98008#p98008
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*/
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16, 16, 16, 18, 25, 37, 56, 85,
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16, 17, 20, 27, 34, 40, 53, 75,
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16, 20, 24, 31, 43, 62, 91, 135,
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18, 27, 31, 40, 53, 74, 106, 156,
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25, 34, 43, 53, 69, 94, 131, 189,
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37, 40, 62, 74, 94, 124, 169, 238,
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56, 53, 91, 106, 131, 169, 226, 311,
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85, 75, 135, 156, 189, 238, 311, 418
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},
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{
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9, 10, 12, 14, 27, 32, 51, 62,
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11, 12, 14, 19, 27, 44, 59, 73,
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12, 14, 18, 25, 42, 59, 79, 78,
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17, 18, 25, 42, 61, 92, 87, 92,
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23, 28, 42, 75, 79, 112, 112, 99,
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40, 42, 59, 84, 88, 124, 132, 111,
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42, 64, 78, 95, 105, 126, 125, 99,
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70, 75, 100, 102, 116, 100, 107, 98
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},
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{
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/* Relevance of human vision to JPEG-DCT compression (1992) Klein, Silverstein and Carney.
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*/
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10, 12, 14, 19, 26, 38, 57, 86,
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12, 18, 21, 28, 35, 41, 54, 76,
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14, 21, 25, 32, 44, 63, 92, 136,
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19, 28, 32, 41, 54, 75, 107, 157,
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26, 35, 44, 54, 70, 95, 132, 190,
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38, 41, 63, 75, 95, 125, 170, 239,
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57, 54, 92, 107, 132, 170, 227, 312,
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86, 76, 136, 157, 190, 239, 312, 419
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},
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{
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/* DCTune perceptual optimization of compressed dental X-Rays (1997) Watson, Taylor, Borthwick
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*/
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7, 8, 10, 14, 23, 44, 95, 241,
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8, 8, 11, 15, 25, 47, 102, 255,
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10, 11, 13, 19, 31, 58, 127, 255,
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14, 15, 19, 27, 44, 83, 181, 255,
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23, 25, 31, 44, 72, 136, 255, 255,
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44, 47, 58, 83, 136, 255, 255, 255,
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95, 102, 127, 181, 255, 255, 255, 255,
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241, 255, 255, 255, 255, 255, 255, 255
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},
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{
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/* A visual detection model for DCT coefficient quantization (12/9/93) Ahumada, Watson, Peterson
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*/
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15, 11, 11, 12, 15, 19, 25, 32,
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11, 13, 10, 10, 12, 15, 19, 24,
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11, 10, 14, 14, 16, 18, 22, 27,
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12, 10, 14, 18, 21, 24, 28, 33,
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15, 12, 16, 21, 26, 31, 36, 42,
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19, 15, 18, 24, 31, 38, 45, 53,
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25, 19, 22, 28, 36, 45, 55, 65,
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32, 24, 27, 33, 42, 53, 65, 77
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},
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{
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/* An improved detection model for DCT coefficient quantization (1993) Peterson, Ahumada and Watson
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*/
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14, 10, 11, 14, 19, 25, 34, 45,
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10, 11, 11, 12, 15, 20, 26, 33,
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11, 11, 15, 18, 21, 25, 31, 38,
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14, 12, 18, 24, 28, 33, 39, 47,
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19, 15, 21, 28, 36, 43, 51, 59,
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25, 20, 25, 33, 43, 54, 64, 74,
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34, 26, 31, 39, 51, 64, 77, 91,
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45, 33, 38, 47, 59, 74, 91, 108
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}
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};
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static const unsigned int std_chrominance_quant_tbl[9][DCTSIZE2] = {
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{
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/* JPEG Annex K
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*/
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17, 18, 24, 47, 99, 99, 99, 99,
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18, 21, 26, 66, 99, 99, 99, 99,
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24, 26, 56, 99, 99, 99, 99, 99,
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47, 66, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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},
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{
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/* flat
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*/
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16,
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16, 16, 16, 16, 16, 16, 16, 16
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},
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{
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8, 12, 15, 15, 86, 96, 96, 98,
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13, 13, 15, 26, 90, 96, 99, 98,
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12, 15, 18, 96, 99, 99, 99, 99,
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17, 16, 90, 96, 99, 99, 99, 99,
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96, 96, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99
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},
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{
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/* From http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20333&p=98008#p98008
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*/
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16, 16, 16, 18, 25, 37, 56, 85,
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16, 17, 20, 27, 34, 40, 53, 75,
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16, 20, 24, 31, 43, 62, 91, 135,
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18, 27, 31, 40, 53, 74, 106, 156,
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25, 34, 43, 53, 69, 94, 131, 189,
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37, 40, 62, 74, 94, 124, 169, 238,
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56, 53, 91, 106, 131, 169, 226, 311,
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85, 75, 135, 156, 189, 238, 311, 418
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},
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{
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9, 10, 17, 19, 62, 89, 91, 97,
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12, 13, 18, 29, 84, 91, 88, 98,
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14, 19, 29, 93, 95, 95, 98, 97,
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20, 26, 84, 88, 95, 95, 98, 94,
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26, 86, 91, 93, 97, 99, 98, 99,
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99, 100, 98, 99, 99, 99, 99, 99,
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99, 99, 99, 99, 99, 99, 99, 99,
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97, 97, 99, 99, 99, 99, 97, 99
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},
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{
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/* Relevance of human vision to JPEG-DCT compression (1992) Klein, Silverstein and Carney.
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* Copied from luma
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*/
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10, 12, 14, 19, 26, 38, 57, 86,
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12, 18, 21, 28, 35, 41, 54, 76,
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14, 21, 25, 32, 44, 63, 92, 136,
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19, 28, 32, 41, 54, 75, 107, 157,
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26, 35, 44, 54, 70, 95, 132, 190,
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38, 41, 63, 75, 95, 125, 170, 239,
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57, 54, 92, 107, 132, 170, 227, 312,
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86, 76, 136, 157, 190, 239, 312, 419
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},
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{
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/* DCTune perceptual optimization of compressed dental X-Rays (1997) Watson, Taylor, Borthwick
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* Copied from luma
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*/
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7, 8, 10, 14, 23, 44, 95, 241,
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8, 8, 11, 15, 25, 47, 102, 255,
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10, 11, 13, 19, 31, 58, 127, 255,
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14, 15, 19, 27, 44, 83, 181, 255,
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23, 25, 31, 44, 72, 136, 255, 255,
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44, 47, 58, 83, 136, 255, 255, 255,
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95, 102, 127, 181, 255, 255, 255, 255,
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241, 255, 255, 255, 255, 255, 255, 255
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},
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{
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/* A visual detection model for DCT coefficient quantization (12/9/93) Ahumada, Watson, Peterson
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* Copied from luma
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*/
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15, 11, 11, 12, 15, 19, 25, 32,
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11, 13, 10, 10, 12, 15, 19, 24,
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11, 10, 14, 14, 16, 18, 22, 27,
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12, 10, 14, 18, 21, 24, 28, 33,
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15, 12, 16, 21, 26, 31, 36, 42,
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19, 15, 18, 24, 31, 38, 45, 53,
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25, 19, 22, 28, 36, 45, 55, 65,
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32, 24, 27, 33, 42, 53, 65, 77
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},
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{
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/* An improved detection model for DCT coefficient quantization (1993) Peterson, Ahumada and Watson
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* Copied from luma
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*/
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14, 10, 11, 14, 19, 25, 34, 45,
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10, 11, 11, 12, 15, 20, 26, 33,
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11, 11, 15, 18, 21, 25, 31, 38,
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14, 12, 18, 24, 28, 33, 39, 47,
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19, 15, 21, 28, 36, 43, 51, 59,
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25, 20, 25, 33, 43, 54, 64, 74,
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34, 26, 31, 39, 51, 64, 77, 91,
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45, 33, 38, 47, 59, 74, 91, 108
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}
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};
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#if JPEG_LIB_VERSION >= 70
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GLOBAL(void)
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jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
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/* Set or change the 'quality' (quantization) setting, using default tables
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* and straight percentage-scaling quality scales.
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* This entry point allows different scalings for luminance and chrominance.
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*/
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{
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/* Set up two quantization tables using the specified scaling */
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jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl[cinfo->master->quant_tbl_master_idx],
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cinfo->q_scale_factor[0], force_baseline);
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jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl[cinfo->master->quant_tbl_master_idx],
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cinfo->q_scale_factor[1], force_baseline);
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}
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#endif
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GLOBAL(void)
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jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
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boolean force_baseline)
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/* Set or change the 'quality' (quantization) setting, using default tables
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* and a straight percentage-scaling quality scale. In most cases it's better
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* to use jpeg_set_quality (below); this entry point is provided for
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* applications that insist on a linear percentage scaling.
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*/
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{
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/* Set up two quantization tables using the specified scaling */
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jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl[cinfo->master->quant_tbl_master_idx],
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scale_factor, force_baseline);
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jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl[cinfo->master->quant_tbl_master_idx],
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scale_factor, force_baseline);
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}
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GLOBAL(int)
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jpeg_quality_scaling (int quality)
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{
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return jpeg_float_quality_scaling(quality);
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}
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GLOBAL(float)
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jpeg_float_quality_scaling(float quality)
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/* Convert a user-specified quality rating to a percentage scaling factor
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* for an underlying quantization table, using our recommended scaling curve.
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* The input 'quality' factor should be 0 (terrible) to 100 (very good).
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*/
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{
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/* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */
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if (quality <= 0.f) quality = 1.f;
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if (quality > 100.f) quality = 100.f;
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/* The basic table is used as-is (scaling 100) for a quality of 50.
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* Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
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* note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
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* to make all the table entries 1 (hence, minimum quantization loss).
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* Qualities 1..50 are converted to scaling percentage 5000/Q.
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*/
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if (quality < 50.f)
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quality = 5000.f / quality;
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else
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quality = 200.f - quality*2.f;
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return quality;
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}
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GLOBAL(void)
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jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
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/* Set or change the 'quality' (quantization) setting, using default tables.
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* This is the standard quality-adjusting entry point for typical user
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* interfaces; only those who want detailed control over quantization tables
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* would use the preceding three routines directly.
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*/
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{
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/* Convert user 0-100 rating to percentage scaling */
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quality = jpeg_quality_scaling(quality);
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/* Set up standard quality tables */
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jpeg_set_linear_quality(cinfo, quality, force_baseline);
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}
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/*
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* Default parameter setup for compression.
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*
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* Applications that don't choose to use this routine must do their
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* own setup of all these parameters. Alternately, you can call this
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* to establish defaults and then alter parameters selectively. This
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* is the recommended approach since, if we add any new parameters,
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* your code will still work (they'll be set to reasonable defaults).
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*/
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GLOBAL(void)
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jpeg_set_defaults (j_compress_ptr cinfo)
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{
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int i;
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/* Safety check to ensure start_compress not called yet. */
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if (cinfo->global_state != CSTATE_START)
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ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
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/* Allocate comp_info array large enough for maximum component count.
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* Array is made permanent in case application wants to compress
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* multiple images at same param settings.
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*/
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if (cinfo->comp_info == NULL)
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cinfo->comp_info = (jpeg_component_info *)
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(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
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MAX_COMPONENTS * sizeof(jpeg_component_info));
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/* Initialize everything not dependent on the color space */
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#if JPEG_LIB_VERSION >= 70
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cinfo->scale_num = 1; /* 1:1 scaling */
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cinfo->scale_denom = 1;
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#endif
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cinfo->data_precision = BITS_IN_JSAMPLE;
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/* Set up two quantization tables using default quality of 75 */
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jpeg_set_quality(cinfo, 75, TRUE);
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/* Set up two Huffman tables */
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std_huff_tables((j_common_ptr) cinfo);
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/* Initialize default arithmetic coding conditioning */
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for (i = 0; i < NUM_ARITH_TBLS; i++) {
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cinfo->arith_dc_L[i] = 0;
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cinfo->arith_dc_U[i] = 1;
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cinfo->arith_ac_K[i] = 5;
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}
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/* Default is no multiple-scan output */
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cinfo->scan_info = NULL;
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cinfo->num_scans = 0;
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/* Expect normal source image, not raw downsampled data */
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cinfo->raw_data_in = FALSE;
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/* Use Huffman coding, not arithmetic coding, by default */
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cinfo->arith_code = FALSE;
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#ifdef ENTROPY_OPT_SUPPORTED
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if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION)
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/* By default, do extra passes to optimize entropy coding */
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cinfo->optimize_coding = TRUE;
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else
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/* By default, don't do extra passes to optimize entropy coding */
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cinfo->optimize_coding = FALSE;
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#else
|
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/* By default, don't do extra passes to optimize entropy coding */
|
|
cinfo->optimize_coding = FALSE;
|
|
#endif
|
|
|
|
/* The standard Huffman tables are only valid for 8-bit data precision.
|
|
* If the precision is higher, force optimization on so that usable
|
|
* tables will be computed. This test can be removed if default tables
|
|
* are supplied that are valid for the desired precision.
|
|
*/
|
|
if (cinfo->data_precision > 8)
|
|
cinfo->optimize_coding = TRUE;
|
|
|
|
/* By default, use the simpler non-cosited sampling alignment */
|
|
cinfo->CCIR601_sampling = FALSE;
|
|
|
|
#if JPEG_LIB_VERSION >= 70
|
|
/* By default, apply fancy downsampling */
|
|
cinfo->do_fancy_downsampling = TRUE;
|
|
#endif
|
|
|
|
cinfo->master->overshoot_deringing =
|
|
cinfo->master->compress_profile == JCP_MAX_COMPRESSION;
|
|
|
|
/* No input smoothing */
|
|
cinfo->smoothing_factor = 0;
|
|
|
|
/* DCT algorithm preference */
|
|
cinfo->dct_method = JDCT_DEFAULT;
|
|
|
|
/* No restart markers */
|
|
cinfo->restart_interval = 0;
|
|
cinfo->restart_in_rows = 0;
|
|
|
|
/* Fill in default JFIF marker parameters. Note that whether the marker
|
|
* will actually be written is determined by jpeg_set_colorspace.
|
|
*
|
|
* By default, the library emits JFIF version code 1.01.
|
|
* An application that wants to emit JFIF 1.02 extension markers should set
|
|
* JFIF_minor_version to 2. We could probably get away with just defaulting
|
|
* to 1.02, but there may still be some decoders in use that will complain
|
|
* about that; saying 1.01 should minimize compatibility problems.
|
|
*/
|
|
cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */
|
|
cinfo->JFIF_minor_version = 1;
|
|
cinfo->density_unit = 0; /* Pixel size is unknown by default */
|
|
cinfo->X_density = 1; /* Pixel aspect ratio is square by default */
|
|
cinfo->Y_density = 1;
|
|
|
|
/* Choose JPEG colorspace based on input space, set defaults accordingly */
|
|
|
|
jpeg_default_colorspace(cinfo);
|
|
|
|
cinfo->master->dc_scan_opt_mode = 1;
|
|
|
|
#ifdef C_PROGRESSIVE_SUPPORTED
|
|
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
|
|
cinfo->master->optimize_scans = TRUE;
|
|
jpeg_simple_progression(cinfo);
|
|
} else
|
|
cinfo->master->optimize_scans = FALSE;
|
|
#endif
|
|
|
|
cinfo->master->trellis_quant =
|
|
cinfo->master->compress_profile == JCP_MAX_COMPRESSION;
|
|
cinfo->master->lambda_log_scale1 = 14.75;
|
|
cinfo->master->lambda_log_scale2 = 16.5;
|
|
cinfo->master->quant_tbl_master_idx =
|
|
cinfo->master->compress_profile == JCP_MAX_COMPRESSION ? 3 : 0;
|
|
|
|
cinfo->master->use_lambda_weight_tbl = TRUE;
|
|
cinfo->master->use_scans_in_trellis = FALSE;
|
|
cinfo->master->trellis_freq_split = 8;
|
|
cinfo->master->trellis_num_loops = 1;
|
|
cinfo->master->trellis_q_opt = FALSE;
|
|
cinfo->master->trellis_quant_dc = TRUE;
|
|
cinfo->master->trellis_delta_dc_weight = 0.0;
|
|
}
|
|
|
|
|
|
/*
|
|
* Select an appropriate JPEG colorspace for in_color_space.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_default_colorspace (j_compress_ptr cinfo)
|
|
{
|
|
switch (cinfo->in_color_space) {
|
|
case JCS_GRAYSCALE:
|
|
jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
|
|
break;
|
|
case JCS_RGB:
|
|
case JCS_EXT_RGB:
|
|
case JCS_EXT_RGBX:
|
|
case JCS_EXT_BGR:
|
|
case JCS_EXT_BGRX:
|
|
case JCS_EXT_XBGR:
|
|
case JCS_EXT_XRGB:
|
|
case JCS_EXT_RGBA:
|
|
case JCS_EXT_BGRA:
|
|
case JCS_EXT_ABGR:
|
|
case JCS_EXT_ARGB:
|
|
jpeg_set_colorspace(cinfo, JCS_YCbCr);
|
|
break;
|
|
case JCS_YCbCr:
|
|
jpeg_set_colorspace(cinfo, JCS_YCbCr);
|
|
break;
|
|
case JCS_CMYK:
|
|
jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
|
|
break;
|
|
case JCS_YCCK:
|
|
jpeg_set_colorspace(cinfo, JCS_YCCK);
|
|
break;
|
|
case JCS_UNKNOWN:
|
|
jpeg_set_colorspace(cinfo, JCS_UNKNOWN);
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
* Set the JPEG colorspace, and choose colorspace-dependent default values.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
|
|
{
|
|
jpeg_component_info *compptr;
|
|
int ci;
|
|
|
|
#define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \
|
|
(compptr = &cinfo->comp_info[index], \
|
|
compptr->component_id = (id), \
|
|
compptr->h_samp_factor = (hsamp), \
|
|
compptr->v_samp_factor = (vsamp), \
|
|
compptr->quant_tbl_no = (quant), \
|
|
compptr->dc_tbl_no = (dctbl), \
|
|
compptr->ac_tbl_no = (actbl) )
|
|
|
|
/* Safety check to ensure start_compress not called yet. */
|
|
if (cinfo->global_state != CSTATE_START)
|
|
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
|
|
|
/* For all colorspaces, we use Q and Huff tables 0 for luminance components,
|
|
* tables 1 for chrominance components.
|
|
*/
|
|
|
|
cinfo->jpeg_color_space = colorspace;
|
|
|
|
cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
|
|
cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
|
|
|
|
switch (colorspace) {
|
|
case JCS_GRAYSCALE:
|
|
cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
|
|
cinfo->num_components = 1;
|
|
/* JFIF specifies component ID 1 */
|
|
SET_COMP(0, 1, 1,1, 0, 0,0);
|
|
break;
|
|
case JCS_RGB:
|
|
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
|
|
cinfo->num_components = 3;
|
|
SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);
|
|
SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
|
|
SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);
|
|
break;
|
|
case JCS_YCbCr:
|
|
cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
|
|
cinfo->num_components = 3;
|
|
/* JFIF specifies component IDs 1,2,3 */
|
|
/* We default to 2x2 subsamples of chrominance */
|
|
SET_COMP(0, 1, 2,2, 0, 0,0);
|
|
SET_COMP(1, 2, 1,1, 1, 1,1);
|
|
SET_COMP(2, 3, 1,1, 1, 1,1);
|
|
break;
|
|
case JCS_CMYK:
|
|
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
|
|
cinfo->num_components = 4;
|
|
SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
|
|
SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
|
|
SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
|
|
SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
|
|
break;
|
|
case JCS_YCCK:
|
|
cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
|
|
cinfo->num_components = 4;
|
|
SET_COMP(0, 1, 2,2, 0, 0,0);
|
|
SET_COMP(1, 2, 1,1, 1, 1,1);
|
|
SET_COMP(2, 3, 1,1, 1, 1,1);
|
|
SET_COMP(3, 4, 2,2, 0, 0,0);
|
|
break;
|
|
case JCS_UNKNOWN:
|
|
cinfo->num_components = cinfo->input_components;
|
|
if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
|
|
ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
|
|
MAX_COMPONENTS);
|
|
for (ci = 0; ci < cinfo->num_components; ci++) {
|
|
SET_COMP(ci, ci, 1,1, 0, 0,0);
|
|
}
|
|
break;
|
|
default:
|
|
ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
|
|
}
|
|
}
|
|
|
|
|
|
#ifdef C_PROGRESSIVE_SUPPORTED
|
|
|
|
LOCAL(jpeg_scan_info *)
|
|
fill_a_scan(jpeg_scan_info *scanptr, int ci, int Ss, int Se, int Ah, int Al)
|
|
/* Support routine: generate one scan for specified component */
|
|
{
|
|
scanptr->comps_in_scan = 1;
|
|
scanptr->component_index[0] = ci;
|
|
scanptr->Ss = Ss;
|
|
scanptr->Se = Se;
|
|
scanptr->Ah = Ah;
|
|
scanptr->Al = Al;
|
|
scanptr++;
|
|
return scanptr;
|
|
}
|
|
|
|
LOCAL(jpeg_scan_info *)
|
|
fill_a_scan_pair (jpeg_scan_info * scanptr, int ci,
|
|
int Ss, int Se, int Ah, int Al)
|
|
/* Support routine: generate one scan for pair of components */
|
|
{
|
|
scanptr->comps_in_scan = 2;
|
|
scanptr->component_index[0] = ci;
|
|
scanptr->component_index[1] = ci + 1;
|
|
scanptr->Ss = Ss;
|
|
scanptr->Se = Se;
|
|
scanptr->Ah = Ah;
|
|
scanptr->Al = Al;
|
|
scanptr++;
|
|
return scanptr;
|
|
}
|
|
|
|
LOCAL(jpeg_scan_info *)
|
|
fill_scans (jpeg_scan_info *scanptr, int ncomps,
|
|
int Ss, int Se, int Ah, int Al)
|
|
/* Support routine: generate one scan for each component */
|
|
{
|
|
int ci;
|
|
|
|
for (ci = 0; ci < ncomps; ci++) {
|
|
scanptr->comps_in_scan = 1;
|
|
scanptr->component_index[0] = ci;
|
|
scanptr->Ss = Ss;
|
|
scanptr->Se = Se;
|
|
scanptr->Ah = Ah;
|
|
scanptr->Al = Al;
|
|
scanptr++;
|
|
}
|
|
return scanptr;
|
|
}
|
|
|
|
LOCAL(jpeg_scan_info *)
|
|
fill_dc_scans (jpeg_scan_info *scanptr, int ncomps, int Ah, int Al)
|
|
/* Support routine: generate interleaved DC scan if possible, else N scans */
|
|
{
|
|
int ci;
|
|
|
|
if (ncomps <= MAX_COMPS_IN_SCAN) {
|
|
/* Single interleaved DC scan */
|
|
scanptr->comps_in_scan = ncomps;
|
|
for (ci = 0; ci < ncomps; ci++)
|
|
scanptr->component_index[ci] = ci;
|
|
scanptr->Ss = scanptr->Se = 0;
|
|
scanptr->Ah = Ah;
|
|
scanptr->Al = Al;
|
|
scanptr++;
|
|
} else {
|
|
/* Noninterleaved DC scan for each component */
|
|
scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);
|
|
}
|
|
return scanptr;
|
|
}
|
|
|
|
|
|
/*
|
|
* List of scans to be tested
|
|
* cinfo->num_components and cinfo->jpeg_color_space must be correct.
|
|
*/
|
|
|
|
LOCAL(boolean)
|
|
jpeg_search_progression (j_compress_ptr cinfo)
|
|
{
|
|
int ncomps = cinfo->num_components;
|
|
int nscans;
|
|
jpeg_scan_info * scanptr;
|
|
int Al;
|
|
int frequency_split[] = { 2, 8, 5, 12, 18 };
|
|
int i;
|
|
|
|
/* Safety check to ensure start_compress not called yet. */
|
|
if (cinfo->global_state != CSTATE_START)
|
|
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
|
|
|
/* Figure space needed for script. Calculation must match code below! */
|
|
if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
|
|
/* Custom script for YCbCr color images. */
|
|
nscans = 64;
|
|
} else if (ncomps == 1) {
|
|
nscans = 23;
|
|
} else {
|
|
cinfo->master->num_scans_luma = 0;
|
|
return FALSE;
|
|
}
|
|
|
|
/* Allocate space for script.
|
|
* We need to put it in the permanent pool in case the application performs
|
|
* multiple compressions without changing the settings. To avoid a memory
|
|
* leak if jpeg_simple_progression is called repeatedly for the same JPEG
|
|
* object, we try to re-use previously allocated space, and we allocate
|
|
* enough space to handle YCbCr even if initially asked for grayscale.
|
|
*/
|
|
if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {
|
|
cinfo->script_space_size = MAX(nscans, 64);
|
|
cinfo->script_space = (jpeg_scan_info *)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
|
|
cinfo->script_space_size * sizeof(jpeg_scan_info));
|
|
}
|
|
scanptr = cinfo->script_space;
|
|
cinfo->scan_info = scanptr;
|
|
cinfo->num_scans = nscans;
|
|
|
|
cinfo->master->Al_max_luma = 3;
|
|
cinfo->master->num_scans_luma_dc = 1;
|
|
cinfo->master->num_frequency_splits = 5;
|
|
cinfo->master->num_scans_luma =
|
|
cinfo->master->num_scans_luma_dc + (3 * cinfo->master->Al_max_luma + 2) +
|
|
(2 * cinfo->master->num_frequency_splits + 1);
|
|
|
|
/* 23 scans for luma */
|
|
/* 1 scan for DC */
|
|
/* 11 scans to determine successive approximation */
|
|
/* 11 scans to determine frequency approximation */
|
|
/* after 12 scans need to update following 11 */
|
|
/* after 23 scans need to determine which to keep */
|
|
/* last 4 done conditionally */
|
|
|
|
/* luma DC by itself */
|
|
if (cinfo->master->dc_scan_opt_mode == 0)
|
|
scanptr = fill_dc_scans(scanptr, ncomps, 0, 0);
|
|
else
|
|
scanptr = fill_dc_scans(scanptr, 1, 0, 0);
|
|
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 8, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 0, 9, 63, 0, 0);
|
|
|
|
for (Al = 0; Al < cinfo->master->Al_max_luma; Al++) {
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 63, Al+1, Al);
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 8, 0, Al+1);
|
|
scanptr = fill_a_scan(scanptr, 0, 9, 63, 0, Al+1);
|
|
}
|
|
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 63, 0, 0);
|
|
|
|
for (i = 0; i < cinfo->master->num_frequency_splits; i++) {
|
|
scanptr = fill_a_scan(scanptr, 0, 1, frequency_split[i], 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 0, frequency_split[i]+1, 63, 0, 0);
|
|
}
|
|
|
|
if (ncomps == 1) {
|
|
cinfo->master->Al_max_chroma = 0;
|
|
cinfo->master->num_scans_chroma_dc = 0;
|
|
} else {
|
|
cinfo->master->Al_max_chroma = 2;
|
|
cinfo->master->num_scans_chroma_dc = 3;
|
|
/* 41 scans for chroma */
|
|
|
|
/* chroma DC combined */
|
|
scanptr = fill_a_scan_pair(scanptr, 1, 0, 0, 0, 0);
|
|
/* chroma DC separate */
|
|
scanptr = fill_a_scan(scanptr, 1, 0, 0, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 0, 0, 0, 0);
|
|
|
|
scanptr = fill_a_scan(scanptr, 1, 1, 8, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 1, 9, 63, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 1, 8, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 9, 63, 0, 0);
|
|
|
|
for (Al = 0; Al < cinfo->master->Al_max_chroma; Al++) {
|
|
scanptr = fill_a_scan(scanptr, 1, 1, 63, Al+1, Al);
|
|
scanptr = fill_a_scan(scanptr, 2, 1, 63, Al+1, Al);
|
|
scanptr = fill_a_scan(scanptr, 1, 1, 8, 0, Al+1);
|
|
scanptr = fill_a_scan(scanptr, 1, 9, 63, 0, Al+1);
|
|
scanptr = fill_a_scan(scanptr, 2, 1, 8, 0, Al+1);
|
|
scanptr = fill_a_scan(scanptr, 2, 9, 63, 0, Al+1);
|
|
}
|
|
|
|
scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 0);
|
|
|
|
for (i = 0; i < cinfo->master->num_frequency_splits; i++) {
|
|
scanptr = fill_a_scan(scanptr, 1, 1, frequency_split[i], 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 1, frequency_split[i]+1, 63, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 1, frequency_split[i], 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, frequency_split[i]+1, 63, 0, 0);
|
|
}
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/*
|
|
* Create a recommended progressive-JPEG script.
|
|
* cinfo->num_components and cinfo->jpeg_color_space must be correct.
|
|
*/
|
|
|
|
GLOBAL(void)
|
|
jpeg_simple_progression (j_compress_ptr cinfo)
|
|
{
|
|
int ncomps;
|
|
int nscans;
|
|
jpeg_scan_info *scanptr;
|
|
|
|
if (cinfo->master->optimize_scans) {
|
|
if (jpeg_search_progression(cinfo) == TRUE)
|
|
return;
|
|
}
|
|
|
|
/* Safety check to ensure start_compress not called yet. */
|
|
if (cinfo->global_state != CSTATE_START)
|
|
ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
|
|
|
|
/* Figure space needed for script. Calculation must match code below! */
|
|
ncomps = cinfo->num_components;
|
|
if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
|
|
/* Custom script for YCbCr color images. */
|
|
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
|
|
if (cinfo->master->dc_scan_opt_mode == 0) {
|
|
nscans = 9; /* 1 DC scan for all components */
|
|
} else if (cinfo->master->dc_scan_opt_mode == 1) {
|
|
nscans = 11; /* 1 DC scan for each component */
|
|
} else {
|
|
nscans = 10; /* 1 DC scan for luminance and 1 DC scan for chroma */
|
|
}
|
|
} else {
|
|
nscans = 10; /* 2 DC scans and 8 AC scans */
|
|
}
|
|
} else {
|
|
/* All-purpose script for other color spaces. */
|
|
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
|
|
if (ncomps > MAX_COMPS_IN_SCAN)
|
|
nscans = 5 * ncomps; /* 2 DC + 4 AC scans per component */
|
|
else
|
|
nscans = 1 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */
|
|
} else {
|
|
if (ncomps > MAX_COMPS_IN_SCAN)
|
|
nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */
|
|
else
|
|
nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */
|
|
}
|
|
}
|
|
|
|
/* Allocate space for script.
|
|
* We need to put it in the permanent pool in case the application performs
|
|
* multiple compressions without changing the settings. To avoid a memory
|
|
* leak if jpeg_simple_progression is called repeatedly for the same JPEG
|
|
* object, we try to re-use previously allocated space, and we allocate
|
|
* enough space to handle YCbCr even if initially asked for grayscale.
|
|
*/
|
|
if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {
|
|
cinfo->script_space_size = MAX(nscans, 10);
|
|
cinfo->script_space = (jpeg_scan_info *)
|
|
(*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
|
|
cinfo->script_space_size * sizeof(jpeg_scan_info));
|
|
}
|
|
scanptr = cinfo->script_space;
|
|
cinfo->scan_info = scanptr;
|
|
cinfo->num_scans = nscans;
|
|
|
|
if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
|
|
/* Custom script for YCbCr color images. */
|
|
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
|
|
/* scan defined in jpeg_scan_rgb.txt in jpgcrush */
|
|
/* Initial DC scan */
|
|
if (cinfo->master->dc_scan_opt_mode == 0) {
|
|
/* 1 DC scan for all components */
|
|
scanptr = fill_dc_scans(scanptr, ncomps, 0, 0);
|
|
} else if (cinfo->master->dc_scan_opt_mode == 1) {
|
|
/* 1 DC scan for each component */
|
|
scanptr = fill_a_scan(scanptr, 0, 0, 0, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 1, 0, 0, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 0, 0, 0, 0);
|
|
} else {
|
|
/* 1 DC scan for luminance and 1 DC scan for chroma */
|
|
scanptr = fill_dc_scans(scanptr, 1, 0, 0);
|
|
scanptr = fill_a_scan_pair(scanptr, 1, 0, 0, 0, 0);
|
|
}
|
|
/* Low frequency AC scans */
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 8, 0, 2);
|
|
scanptr = fill_a_scan(scanptr, 1, 1, 8, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 1, 8, 0, 0);
|
|
/* Complete spectral selection for luma AC */
|
|
scanptr = fill_a_scan(scanptr, 0, 9, 63, 0, 2);
|
|
/* Finish luma AC successive approximation */
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);
|
|
/* Complete spectral selection for chroma AC */
|
|
scanptr = fill_a_scan(scanptr, 1, 9, 63, 0, 0);
|
|
scanptr = fill_a_scan(scanptr, 2, 9, 63, 0, 0);
|
|
} else {
|
|
/* Initial DC scan */
|
|
scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
|
|
/* Initial AC scan: get some luma data out in a hurry */
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);
|
|
/* Chroma data is too small to be worth expending many scans on */
|
|
scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);
|
|
scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);
|
|
/* Complete spectral selection for luma AC */
|
|
scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);
|
|
/* Refine next bit of luma AC */
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);
|
|
/* Finish DC successive approximation */
|
|
scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
|
|
/* Finish AC successive approximation */
|
|
scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);
|
|
scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);
|
|
/* Luma bottom bit comes last since it's usually largest scan */
|
|
scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);
|
|
}
|
|
} else {
|
|
/* All-purpose script for other color spaces. */
|
|
if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION) {
|
|
/* scan defined in jpeg_scan_bw.txt in jpgcrush */
|
|
/* DC component, no successive approximation */
|
|
scanptr = fill_dc_scans(scanptr, ncomps, 0, 0);
|
|
/* Successive approximation first pass */
|
|
scanptr = fill_scans(scanptr, ncomps, 1, 8, 0, 2);
|
|
scanptr = fill_scans(scanptr, ncomps, 9, 63, 0, 2);
|
|
/* Successive approximation second pass */
|
|
scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
|
|
/* Successive approximation final pass */
|
|
scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
|
|
} else {
|
|
/* Successive approximation first pass */
|
|
scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
|
|
scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);
|
|
scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);
|
|
/* Successive approximation second pass */
|
|
scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
|
|
/* Successive approximation final pass */
|
|
scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
|
|
scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif /* C_PROGRESSIVE_SUPPORTED */
|