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- /*
- * jcparam.c
- *
- * This file was part of the Independent JPEG Group's software:
- * Copyright (C) 1991-1998, Thomas G. Lane.
- * Modified 2003-2008 by Guido Vollbeding.
- * libjpeg-turbo Modifications:
- * Copyright (C) 2009-2011, 2018, D. R. Commander.
- * mozjpeg Modifications:
- * Copyright (C) 2014, Mozilla Corporation.
- * For conditions of distribution and use, see the accompanying README file.
- *
- * This file contains optional default-setting code for the JPEG compressor.
- * Applications do not have to use this file, but those that don't use it
- * must know a lot more about the innards of the JPEG code.
- */
- #define JPEG_INTERNALS
- #include "jinclude.h"
- #include "jpeglib.h"
- #include "jstdhuff.c"
- /*
- * Quantization table setup routines
- */
- GLOBAL(void)
- jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
- const unsigned int *basic_table, int scale_factor,
- boolean force_baseline)
- /* Define a quantization table equal to the basic_table times
- * a scale factor (given as a percentage).
- * If force_baseline is TRUE, the computed quantization table entries
- * are limited to 1..255 for JPEG baseline compatibility.
- */
- {
- JQUANT_TBL **qtblptr;
- int i;
- long temp;
- /* Safety check to ensure start_compress not called yet. */
- if (cinfo->global_state != CSTATE_START)
- ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
- if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
- ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
- qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
- if (*qtblptr == NULL)
- *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
- for (i = 0; i < DCTSIZE2; i++) {
- temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
- /* limit the values to the valid range */
- if (temp <= 0L) temp = 1L;
- if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
- if (force_baseline && temp > 255L)
- temp = 255L; /* limit to baseline range if requested */
- (*qtblptr)->quantval[i] = (UINT16) temp;
- }
- /* Initialize sent_table FALSE so table will be written to JPEG file. */
- (*qtblptr)->sent_table = FALSE;
- }
- /* These are the sample quantization tables given in Annex K (Clause K.1) of
- * Recommendation ITU-T T.81 (1992) | ISO/IEC 10918-1:1994.
- * The spec says that the values given produce "good" quality, and
- * when divided by 2, "very good" quality.
- */
- static const unsigned int std_luminance_quant_tbl[9][DCTSIZE2] = {
- {
- /* JPEG Annex K
- */
- 16, 11, 10, 16, 24, 40, 51, 61,
- 12, 12, 14, 19, 26, 58, 60, 55,
- 14, 13, 16, 24, 40, 57, 69, 56,
- 14, 17, 22, 29, 51, 87, 80, 62,
- 18, 22, 37, 56, 68, 109, 103, 77,
- 24, 35, 55, 64, 81, 104, 113, 92,
- 49, 64, 78, 87, 103, 121, 120, 101,
- 72, 92, 95, 98, 112, 100, 103, 99
- },
- {
- /* flat
- */
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16
- },
- {
- 12, 17, 20, 21, 30, 34, 56, 63,
- 18, 20, 20, 26, 28, 51, 61, 55,
- 19, 20, 21, 26, 33, 58, 69, 55,
- 26, 26, 26, 30, 46, 87, 86, 66,
- 31, 33, 36, 40, 46, 96, 100, 73,
- 40, 35, 46, 62, 81, 100, 111, 91,
- 46, 66, 76, 86, 102, 121, 120, 101,
- 68, 90, 90, 96, 113, 102, 105, 103
- },
- {
- /* From http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20333&p=98008#p98008
- */
- 16, 16, 16, 18, 25, 37, 56, 85,
- 16, 17, 20, 27, 34, 40, 53, 75,
- 16, 20, 24, 31, 43, 62, 91, 135,
- 18, 27, 31, 40, 53, 74, 106, 156,
- 25, 34, 43, 53, 69, 94, 131, 189,
- 37, 40, 62, 74, 94, 124, 169, 238,
- 56, 53, 91, 106, 131, 169, 226, 311,
- 85, 75, 135, 156, 189, 238, 311, 418
- },
- {
- 9, 10, 12, 14, 27, 32, 51, 62,
- 11, 12, 14, 19, 27, 44, 59, 73,
- 12, 14, 18, 25, 42, 59, 79, 78,
- 17, 18, 25, 42, 61, 92, 87, 92,
- 23, 28, 42, 75, 79, 112, 112, 99,
- 40, 42, 59, 84, 88, 124, 132, 111,
- 42, 64, 78, 95, 105, 126, 125, 99,
- 70, 75, 100, 102, 116, 100, 107, 98
- },
- {
- /* Relevance of human vision to JPEG-DCT compression (1992) Klein, Silverstein and Carney.
- */
- 10, 12, 14, 19, 26, 38, 57, 86,
- 12, 18, 21, 28, 35, 41, 54, 76,
- 14, 21, 25, 32, 44, 63, 92, 136,
- 19, 28, 32, 41, 54, 75, 107, 157,
- 26, 35, 44, 54, 70, 95, 132, 190,
- 38, 41, 63, 75, 95, 125, 170, 239,
- 57, 54, 92, 107, 132, 170, 227, 312,
- 86, 76, 136, 157, 190, 239, 312, 419
- },
- {
- /* DCTune perceptual optimization of compressed dental X-Rays (1997) Watson, Taylor, Borthwick
- */
- 7, 8, 10, 14, 23, 44, 95, 241,
- 8, 8, 11, 15, 25, 47, 102, 255,
- 10, 11, 13, 19, 31, 58, 127, 255,
- 14, 15, 19, 27, 44, 83, 181, 255,
- 23, 25, 31, 44, 72, 136, 255, 255,
- 44, 47, 58, 83, 136, 255, 255, 255,
- 95, 102, 127, 181, 255, 255, 255, 255,
- 241, 255, 255, 255, 255, 255, 255, 255
- },
- {
- /* A visual detection model for DCT coefficient quantization (12/9/93) Ahumada, Watson, Peterson
- */
- 15, 11, 11, 12, 15, 19, 25, 32,
- 11, 13, 10, 10, 12, 15, 19, 24,
- 11, 10, 14, 14, 16, 18, 22, 27,
- 12, 10, 14, 18, 21, 24, 28, 33,
- 15, 12, 16, 21, 26, 31, 36, 42,
- 19, 15, 18, 24, 31, 38, 45, 53,
- 25, 19, 22, 28, 36, 45, 55, 65,
- 32, 24, 27, 33, 42, 53, 65, 77
- },
- {
- /* An improved detection model for DCT coefficient quantization (1993) Peterson, Ahumada and Watson
- */
- 14, 10, 11, 14, 19, 25, 34, 45,
- 10, 11, 11, 12, 15, 20, 26, 33,
- 11, 11, 15, 18, 21, 25, 31, 38,
- 14, 12, 18, 24, 28, 33, 39, 47,
- 19, 15, 21, 28, 36, 43, 51, 59,
- 25, 20, 25, 33, 43, 54, 64, 74,
- 34, 26, 31, 39, 51, 64, 77, 91,
- 45, 33, 38, 47, 59, 74, 91, 108
- }
- };
- static const unsigned int std_chrominance_quant_tbl[9][DCTSIZE2] = {
- {
- /* JPEG Annex K
- */
- 17, 18, 24, 47, 99, 99, 99, 99,
- 18, 21, 26, 66, 99, 99, 99, 99,
- 24, 26, 56, 99, 99, 99, 99, 99,
- 47, 66, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99
- },
- {
- /* flat
- */
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16,
- 16, 16, 16, 16, 16, 16, 16, 16
- },
- {
- 8, 12, 15, 15, 86, 96, 96, 98,
- 13, 13, 15, 26, 90, 96, 99, 98,
- 12, 15, 18, 96, 99, 99, 99, 99,
- 17, 16, 90, 96, 99, 99, 99, 99,
- 96, 96, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99
- },
- {
- /* From http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20333&p=98008#p98008
- */
- 16, 16, 16, 18, 25, 37, 56, 85,
- 16, 17, 20, 27, 34, 40, 53, 75,
- 16, 20, 24, 31, 43, 62, 91, 135,
- 18, 27, 31, 40, 53, 74, 106, 156,
- 25, 34, 43, 53, 69, 94, 131, 189,
- 37, 40, 62, 74, 94, 124, 169, 238,
- 56, 53, 91, 106, 131, 169, 226, 311,
- 85, 75, 135, 156, 189, 238, 311, 418
- },
- {
- 9, 10, 17, 19, 62, 89, 91, 97,
- 12, 13, 18, 29, 84, 91, 88, 98,
- 14, 19, 29, 93, 95, 95, 98, 97,
- 20, 26, 84, 88, 95, 95, 98, 94,
- 26, 86, 91, 93, 97, 99, 98, 99,
- 99, 100, 98, 99, 99, 99, 99, 99,
- 99, 99, 99, 99, 99, 99, 99, 99,
- 97, 97, 99, 99, 99, 99, 97, 99
- },
- {
- /* Relevance of human vision to JPEG-DCT compression (1992) Klein, Silverstein and Carney.
- * Copied from luma
- */
- 10, 12, 14, 19, 26, 38, 57, 86,
- 12, 18, 21, 28, 35, 41, 54, 76,
- 14, 21, 25, 32, 44, 63, 92, 136,
- 19, 28, 32, 41, 54, 75, 107, 157,
- 26, 35, 44, 54, 70, 95, 132, 190,
- 38, 41, 63, 75, 95, 125, 170, 239,
- 57, 54, 92, 107, 132, 170, 227, 312,
- 86, 76, 136, 157, 190, 239, 312, 419
- },
- {
- /* DCTune perceptual optimization of compressed dental X-Rays (1997) Watson, Taylor, Borthwick
- * Copied from luma
- */
- 7, 8, 10, 14, 23, 44, 95, 241,
- 8, 8, 11, 15, 25, 47, 102, 255,
- 10, 11, 13, 19, 31, 58, 127, 255,
- 14, 15, 19, 27, 44, 83, 181, 255,
- 23, 25, 31, 44, 72, 136, 255, 255,
- 44, 47, 58, 83, 136, 255, 255, 255,
- 95, 102, 127, 181, 255, 255, 255, 255,
- 241, 255, 255, 255, 255, 255, 255, 255
- },
- {
- /* A visual detection model for DCT coefficient quantization (12/9/93) Ahumada, Watson, Peterson
- * Copied from luma
- */
- 15, 11, 11, 12, 15, 19, 25, 32,
- 11, 13, 10, 10, 12, 15, 19, 24,
- 11, 10, 14, 14, 16, 18, 22, 27,
- 12, 10, 14, 18, 21, 24, 28, 33,
- 15, 12, 16, 21, 26, 31, 36, 42,
- 19, 15, 18, 24, 31, 38, 45, 53,
- 25, 19, 22, 28, 36, 45, 55, 65,
- 32, 24, 27, 33, 42, 53, 65, 77
- },
- {
- /* An improved detection model for DCT coefficient quantization (1993) Peterson, Ahumada and Watson
- * Copied from luma
- */
- 14, 10, 11, 14, 19, 25, 34, 45,
- 10, 11, 11, 12, 15, 20, 26, 33,
- 11, 11, 15, 18, 21, 25, 31, 38,
- 14, 12, 18, 24, 28, 33, 39, 47,
- 19, 15, 21, 28, 36, 43, 51, 59,
- 25, 20, 25, 33, 43, 54, 64, 74,
- 34, 26, 31, 39, 51, 64, 77, 91,
- 45, 33, 38, 47, 59, 74, 91, 108
- }
- };
- #if JPEG_LIB_VERSION >= 70
- GLOBAL(void)
- jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
- /* Set or change the 'quality' (quantization) setting, using default tables
- * and straight percentage-scaling quality scales.
- * This entry point allows different scalings for luminance and chrominance.
- */
- {
- /* Set up two quantization tables using the specified scaling */
- jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl[cinfo->master->quant_tbl_master_idx],
- cinfo->q_scale_factor[0], force_baseline);
- jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl[cinfo->master->quant_tbl_master_idx],
- cinfo->q_scale_factor[1], force_baseline);
- }
- #endif
- GLOBAL(void)
- jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
- boolean force_baseline)
- /* Set or change the 'quality' (quantization) setting, using default tables
- * and a straight percentage-scaling quality scale. In most cases it's better
- * to use jpeg_set_quality (below); this entry point is provided for
- * applications that insist on a linear percentage scaling.
- */
- {
- /* Set up two quantization tables using the specified scaling */
- jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl[cinfo->master->quant_tbl_master_idx],
- scale_factor, force_baseline);
- jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl[cinfo->master->quant_tbl_master_idx],
- scale_factor, force_baseline);
- }
- GLOBAL(int)
- jpeg_quality_scaling (int quality)
- {
- return jpeg_float_quality_scaling(quality);
- }
- GLOBAL(float)
- jpeg_float_quality_scaling(float quality)
- /* Convert a user-specified quality rating to a percentage scaling factor
- * for an underlying quantization table, using our recommended scaling curve.
- * The input 'quality' factor should be 0 (terrible) to 100 (very good).
- */
- {
- /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */
- if (quality <= 0.f) quality = 1.f;
- if (quality > 100.f) quality = 100.f;
- /* The basic table is used as-is (scaling 100) for a quality of 50.
- * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
- * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
- * to make all the table entries 1 (hence, minimum quantization loss).
- * Qualities 1..50 are converted to scaling percentage 5000/Q.
- */
- if (quality < 50.f)
- quality = 5000.f / quality;
- else
- quality = 200.f - quality*2.f;
- return quality;
- }
- GLOBAL(void)
- jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
- /* Set or change the 'quality' (quantization) setting, using default tables.
- * This is the standard quality-adjusting entry point for typical user
- * interfaces; only those who want detailed control over quantization tables
- * would use the preceding three routines directly.
- */
- {
- /* Convert user 0-100 rating to percentage scaling */
- quality = jpeg_quality_scaling(quality);
- /* Set up standard quality tables */
- jpeg_set_linear_quality(cinfo, quality, force_baseline);
- }
- /*
- * Default parameter setup for compression.
- *
- * Applications that don't choose to use this routine must do their
- * own setup of all these parameters. Alternately, you can call this
- * to establish defaults and then alter parameters selectively. This
- * is the recommended approach since, if we add any new parameters,
- * your code will still work (they'll be set to reasonable defaults).
- */
- GLOBAL(void)
- jpeg_set_defaults (j_compress_ptr cinfo)
- {
- 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);
- /* Allocate comp_info array large enough for maximum component count.
- * Array is made permanent in case application wants to compress
- * multiple images at same param settings.
- */
- if (cinfo->comp_info == NULL)
- cinfo->comp_info = (jpeg_component_info *)
- (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
- MAX_COMPONENTS * sizeof(jpeg_component_info));
- /* Initialize everything not dependent on the color space */
- #if JPEG_LIB_VERSION >= 70
- cinfo->scale_num = 1; /* 1:1 scaling */
- cinfo->scale_denom = 1;
- #endif
- cinfo->data_precision = BITS_IN_JSAMPLE;
- /* Set up two quantization tables using default quality of 75 */
- jpeg_set_quality(cinfo, 75, TRUE);
- /* Set up two Huffman tables */
- std_huff_tables((j_common_ptr) cinfo);
- /* Initialize default arithmetic coding conditioning */
- for (i = 0; i < NUM_ARITH_TBLS; i++) {
- cinfo->arith_dc_L[i] = 0;
- cinfo->arith_dc_U[i] = 1;
- cinfo->arith_ac_K[i] = 5;
- }
- /* Default is no multiple-scan output */
- cinfo->scan_info = NULL;
- cinfo->num_scans = 0;
- /* Expect normal source image, not raw downsampled data */
- cinfo->raw_data_in = FALSE;
- /* Use Huffman coding, not arithmetic coding, by default */
- cinfo->arith_code = FALSE;
- #ifdef ENTROPY_OPT_SUPPORTED
- if (cinfo->master->compress_profile == JCP_MAX_COMPRESSION)
- /* By default, do extra passes to optimize entropy coding */
- cinfo->optimize_coding = TRUE;
- else
- /* By default, don't do extra passes to optimize entropy coding */
- cinfo->optimize_coding = FALSE;
- #else
- /* 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 */
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