Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 1 | /* |
| 2 | * jcparam.c |
| 3 | * |
DRC | a73e870 | 2012-12-31 02:52:30 +0000 | [diff] [blame] | 4 | * This file was part of the Independent JPEG Group's software: |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 5 | * Copyright (C) 1991-1998, Thomas G. Lane. |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 6 | * Modified 2003-2008 by Guido Vollbeding. |
DRC | a6ef282 | 2013-09-28 03:23:49 +0000 | [diff] [blame] | 7 | * libjpeg-turbo Modifications: |
DRC | 67ce3b2 | 2011-12-19 02:21:03 +0000 | [diff] [blame] | 8 | * Copyright (C) 2009-2011, D. R. Commander. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 9 | * For conditions of distribution and use, see the accompanying README file. |
| 10 | * |
| 11 | * This file contains optional default-setting code for the JPEG compressor. |
| 12 | * Applications do not have to use this file, but those that don't use it |
| 13 | * must know a lot more about the innards of the JPEG code. |
| 14 | */ |
| 15 | |
| 16 | #define JPEG_INTERNALS |
| 17 | #include "jinclude.h" |
| 18 | #include "jpeglib.h" |
DRC | a113506 | 2014-01-31 17:22:15 +0000 | [diff] [blame] | 19 | #include "jstdhuff.c" |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 20 | |
| 21 | |
| 22 | /* |
| 23 | * Quantization table setup routines |
| 24 | */ |
| 25 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 26 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 27 | jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 28 | const unsigned int *basic_table, |
| 29 | int scale_factor, boolean force_baseline) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 30 | /* Define a quantization table equal to the basic_table times |
| 31 | * a scale factor (given as a percentage). |
| 32 | * If force_baseline is TRUE, the computed quantization table entries |
| 33 | * are limited to 1..255 for JPEG baseline compatibility. |
| 34 | */ |
| 35 | { |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 36 | JQUANT_TBL ** qtblptr; |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 37 | int i; |
| 38 | long temp; |
| 39 | |
| 40 | /* Safety check to ensure start_compress not called yet. */ |
| 41 | if (cinfo->global_state != CSTATE_START) |
| 42 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 43 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 44 | if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS) |
| 45 | ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl); |
| 46 | |
| 47 | qtblptr = & cinfo->quant_tbl_ptrs[which_tbl]; |
| 48 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 49 | if (*qtblptr == NULL) |
| 50 | *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo); |
| 51 | |
| 52 | for (i = 0; i < DCTSIZE2; i++) { |
| 53 | temp = ((long) basic_table[i] * scale_factor + 50L) / 100L; |
| 54 | /* limit the values to the valid range */ |
| 55 | if (temp <= 0L) temp = 1L; |
| 56 | if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */ |
| 57 | if (force_baseline && temp > 255L) |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 58 | temp = 255L; /* limit to baseline range if requested */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 59 | (*qtblptr)->quantval[i] = (UINT16) temp; |
| 60 | } |
| 61 | |
| 62 | /* Initialize sent_table FALSE so table will be written to JPEG file. */ |
| 63 | (*qtblptr)->sent_table = FALSE; |
| 64 | } |
| 65 | |
| 66 | |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 67 | /* These are the sample quantization tables given in JPEG spec section K.1. |
| 68 | * The spec says that the values given produce "good" quality, and |
| 69 | * when divided by 2, "very good" quality. |
| 70 | */ |
| 71 | static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = { |
| 72 | 16, 11, 10, 16, 24, 40, 51, 61, |
| 73 | 12, 12, 14, 19, 26, 58, 60, 55, |
| 74 | 14, 13, 16, 24, 40, 57, 69, 56, |
| 75 | 14, 17, 22, 29, 51, 87, 80, 62, |
| 76 | 18, 22, 37, 56, 68, 109, 103, 77, |
| 77 | 24, 35, 55, 64, 81, 104, 113, 92, |
| 78 | 49, 64, 78, 87, 103, 121, 120, 101, |
| 79 | 72, 92, 95, 98, 112, 100, 103, 99 |
| 80 | }; |
| 81 | static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = { |
| 82 | 17, 18, 24, 47, 99, 99, 99, 99, |
| 83 | 18, 21, 26, 66, 99, 99, 99, 99, |
| 84 | 24, 26, 56, 99, 99, 99, 99, 99, |
| 85 | 47, 66, 99, 99, 99, 99, 99, 99, |
| 86 | 99, 99, 99, 99, 99, 99, 99, 99, |
| 87 | 99, 99, 99, 99, 99, 99, 99, 99, |
| 88 | 99, 99, 99, 99, 99, 99, 99, 99, |
| 89 | 99, 99, 99, 99, 99, 99, 99, 99 |
| 90 | }; |
| 91 | |
| 92 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 93 | #if JPEG_LIB_VERSION >= 70 |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 94 | GLOBAL(void) |
| 95 | jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline) |
| 96 | /* Set or change the 'quality' (quantization) setting, using default tables |
| 97 | * and straight percentage-scaling quality scales. |
| 98 | * This entry point allows different scalings for luminance and chrominance. |
| 99 | */ |
| 100 | { |
| 101 | /* Set up two quantization tables using the specified scaling */ |
| 102 | jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 103 | cinfo->q_scale_factor[0], force_baseline); |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 104 | jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 105 | cinfo->q_scale_factor[1], force_baseline); |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 106 | } |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 107 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 108 | |
| 109 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 110 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 111 | jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 112 | boolean force_baseline) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 113 | /* Set or change the 'quality' (quantization) setting, using default tables |
| 114 | * and a straight percentage-scaling quality scale. In most cases it's better |
| 115 | * to use jpeg_set_quality (below); this entry point is provided for |
| 116 | * applications that insist on a linear percentage scaling. |
| 117 | */ |
| 118 | { |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 119 | /* Set up two quantization tables using the specified scaling */ |
| 120 | jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 121 | scale_factor, force_baseline); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 122 | jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 123 | scale_factor, force_baseline); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 124 | } |
| 125 | |
| 126 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 127 | GLOBAL(int) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 128 | jpeg_quality_scaling (int quality) |
| 129 | /* Convert a user-specified quality rating to a percentage scaling factor |
| 130 | * for an underlying quantization table, using our recommended scaling curve. |
| 131 | * The input 'quality' factor should be 0 (terrible) to 100 (very good). |
| 132 | */ |
| 133 | { |
| 134 | /* Safety limit on quality factor. Convert 0 to 1 to avoid zero divide. */ |
| 135 | if (quality <= 0) quality = 1; |
| 136 | if (quality > 100) quality = 100; |
| 137 | |
| 138 | /* The basic table is used as-is (scaling 100) for a quality of 50. |
| 139 | * Qualities 50..100 are converted to scaling percentage 200 - 2*Q; |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 140 | * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table |
| 141 | * to make all the table entries 1 (hence, minimum quantization loss). |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 142 | * Qualities 1..50 are converted to scaling percentage 5000/Q. |
| 143 | */ |
| 144 | if (quality < 50) |
| 145 | quality = 5000 / quality; |
| 146 | else |
| 147 | quality = 200 - quality*2; |
| 148 | |
| 149 | return quality; |
| 150 | } |
| 151 | |
| 152 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 153 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 154 | jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline) |
| 155 | /* Set or change the 'quality' (quantization) setting, using default tables. |
| 156 | * This is the standard quality-adjusting entry point for typical user |
| 157 | * interfaces; only those who want detailed control over quantization tables |
| 158 | * would use the preceding three routines directly. |
| 159 | */ |
| 160 | { |
| 161 | /* Convert user 0-100 rating to percentage scaling */ |
| 162 | quality = jpeg_quality_scaling(quality); |
| 163 | |
| 164 | /* Set up standard quality tables */ |
| 165 | jpeg_set_linear_quality(cinfo, quality, force_baseline); |
| 166 | } |
| 167 | |
| 168 | |
| 169 | /* |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 170 | * Default parameter setup for compression. |
| 171 | * |
| 172 | * Applications that don't choose to use this routine must do their |
| 173 | * own setup of all these parameters. Alternately, you can call this |
| 174 | * to establish defaults and then alter parameters selectively. This |
| 175 | * is the recommended approach since, if we add any new parameters, |
| 176 | * your code will still work (they'll be set to reasonable defaults). |
| 177 | */ |
| 178 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 179 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 180 | jpeg_set_defaults (j_compress_ptr cinfo) |
| 181 | { |
| 182 | int i; |
| 183 | |
| 184 | /* Safety check to ensure start_compress not called yet. */ |
| 185 | if (cinfo->global_state != CSTATE_START) |
| 186 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 187 | |
| 188 | /* Allocate comp_info array large enough for maximum component count. |
| 189 | * Array is made permanent in case application wants to compress |
| 190 | * multiple images at same param settings. |
| 191 | */ |
| 192 | if (cinfo->comp_info == NULL) |
| 193 | cinfo->comp_info = (jpeg_component_info *) |
| 194 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame^] | 195 | MAX_COMPONENTS * sizeof(jpeg_component_info)); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 196 | |
| 197 | /* Initialize everything not dependent on the color space */ |
| 198 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 199 | #if JPEG_LIB_VERSION >= 70 |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 200 | cinfo->scale_num = 1; /* 1:1 scaling */ |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 201 | cinfo->scale_denom = 1; |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 202 | #endif |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 203 | cinfo->data_precision = BITS_IN_JSAMPLE; |
| 204 | /* Set up two quantization tables using default quality of 75 */ |
| 205 | jpeg_set_quality(cinfo, 75, TRUE); |
| 206 | /* Set up two Huffman tables */ |
DRC | a113506 | 2014-01-31 17:22:15 +0000 | [diff] [blame] | 207 | std_huff_tables((j_common_ptr) cinfo); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 208 | |
| 209 | /* Initialize default arithmetic coding conditioning */ |
| 210 | for (i = 0; i < NUM_ARITH_TBLS; i++) { |
| 211 | cinfo->arith_dc_L[i] = 0; |
| 212 | cinfo->arith_dc_U[i] = 1; |
| 213 | cinfo->arith_ac_K[i] = 5; |
| 214 | } |
| 215 | |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 216 | /* Default is no multiple-scan output */ |
| 217 | cinfo->scan_info = NULL; |
| 218 | cinfo->num_scans = 0; |
| 219 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 220 | /* Expect normal source image, not raw downsampled data */ |
| 221 | cinfo->raw_data_in = FALSE; |
| 222 | |
| 223 | /* Use Huffman coding, not arithmetic coding, by default */ |
| 224 | cinfo->arith_code = FALSE; |
| 225 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 226 | /* By default, don't do extra passes to optimize entropy coding */ |
| 227 | cinfo->optimize_coding = FALSE; |
| 228 | /* The standard Huffman tables are only valid for 8-bit data precision. |
| 229 | * If the precision is higher, force optimization on so that usable |
| 230 | * tables will be computed. This test can be removed if default tables |
| 231 | * are supplied that are valid for the desired precision. |
| 232 | */ |
| 233 | if (cinfo->data_precision > 8) |
| 234 | cinfo->optimize_coding = TRUE; |
| 235 | |
| 236 | /* By default, use the simpler non-cosited sampling alignment */ |
| 237 | cinfo->CCIR601_sampling = FALSE; |
| 238 | |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 239 | #if JPEG_LIB_VERSION >= 70 |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 240 | /* By default, apply fancy downsampling */ |
| 241 | cinfo->do_fancy_downsampling = TRUE; |
DRC | 36a6eec | 2010-10-08 08:05:44 +0000 | [diff] [blame] | 242 | #endif |
Guido Vollbeding | 5996a25 | 2009-06-27 00:00:00 +0000 | [diff] [blame] | 243 | |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 244 | /* No input smoothing */ |
| 245 | cinfo->smoothing_factor = 0; |
| 246 | |
| 247 | /* DCT algorithm preference */ |
| 248 | cinfo->dct_method = JDCT_DEFAULT; |
| 249 | |
| 250 | /* No restart markers */ |
| 251 | cinfo->restart_interval = 0; |
| 252 | cinfo->restart_in_rows = 0; |
| 253 | |
| 254 | /* Fill in default JFIF marker parameters. Note that whether the marker |
| 255 | * will actually be written is determined by jpeg_set_colorspace. |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 256 | * |
| 257 | * By default, the library emits JFIF version code 1.01. |
| 258 | * An application that wants to emit JFIF 1.02 extension markers should set |
| 259 | * JFIF_minor_version to 2. We could probably get away with just defaulting |
| 260 | * to 1.02, but there may still be some decoders in use that will complain |
| 261 | * about that; saying 1.01 should minimize compatibility problems. |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 262 | */ |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 263 | cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */ |
| 264 | cinfo->JFIF_minor_version = 1; |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 265 | cinfo->density_unit = 0; /* Pixel size is unknown by default */ |
| 266 | cinfo->X_density = 1; /* Pixel aspect ratio is square by default */ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 267 | cinfo->Y_density = 1; |
| 268 | |
| 269 | /* Choose JPEG colorspace based on input space, set defaults accordingly */ |
| 270 | |
| 271 | jpeg_default_colorspace(cinfo); |
| 272 | } |
| 273 | |
| 274 | |
| 275 | /* |
| 276 | * Select an appropriate JPEG colorspace for in_color_space. |
| 277 | */ |
| 278 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 279 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 280 | jpeg_default_colorspace (j_compress_ptr cinfo) |
| 281 | { |
| 282 | switch (cinfo->in_color_space) { |
| 283 | case JCS_GRAYSCALE: |
| 284 | jpeg_set_colorspace(cinfo, JCS_GRAYSCALE); |
| 285 | break; |
| 286 | case JCS_RGB: |
DRC | f25c071 | 2009-04-03 12:00:51 +0000 | [diff] [blame] | 287 | case JCS_EXT_RGB: |
| 288 | case JCS_EXT_RGBX: |
| 289 | case JCS_EXT_BGR: |
| 290 | case JCS_EXT_BGRX: |
| 291 | case JCS_EXT_XBGR: |
| 292 | case JCS_EXT_XRGB: |
DRC | 67ce3b2 | 2011-12-19 02:21:03 +0000 | [diff] [blame] | 293 | case JCS_EXT_RGBA: |
| 294 | case JCS_EXT_BGRA: |
| 295 | case JCS_EXT_ABGR: |
| 296 | case JCS_EXT_ARGB: |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 297 | jpeg_set_colorspace(cinfo, JCS_YCbCr); |
| 298 | break; |
| 299 | case JCS_YCbCr: |
| 300 | jpeg_set_colorspace(cinfo, JCS_YCbCr); |
| 301 | break; |
| 302 | case JCS_CMYK: |
| 303 | jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */ |
| 304 | break; |
| 305 | case JCS_YCCK: |
| 306 | jpeg_set_colorspace(cinfo, JCS_YCCK); |
| 307 | break; |
| 308 | case JCS_UNKNOWN: |
| 309 | jpeg_set_colorspace(cinfo, JCS_UNKNOWN); |
| 310 | break; |
| 311 | default: |
| 312 | ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE); |
| 313 | } |
| 314 | } |
| 315 | |
| 316 | |
| 317 | /* |
| 318 | * Set the JPEG colorspace, and choose colorspace-dependent default values. |
| 319 | */ |
| 320 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 321 | GLOBAL(void) |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 322 | jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace) |
| 323 | { |
| 324 | jpeg_component_info * compptr; |
| 325 | int ci; |
| 326 | |
| 327 | #define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl) \ |
| 328 | (compptr = &cinfo->comp_info[index], \ |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 329 | compptr->component_id = (id), \ |
| 330 | compptr->h_samp_factor = (hsamp), \ |
| 331 | compptr->v_samp_factor = (vsamp), \ |
| 332 | compptr->quant_tbl_no = (quant), \ |
| 333 | compptr->dc_tbl_no = (dctbl), \ |
| 334 | compptr->ac_tbl_no = (actbl) ) |
| 335 | |
| 336 | /* Safety check to ensure start_compress not called yet. */ |
| 337 | if (cinfo->global_state != CSTATE_START) |
| 338 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 339 | |
| 340 | /* For all colorspaces, we use Q and Huff tables 0 for luminance components, |
| 341 | * tables 1 for chrominance components. |
| 342 | */ |
| 343 | |
| 344 | cinfo->jpeg_color_space = colorspace; |
| 345 | |
| 346 | cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */ |
| 347 | cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */ |
| 348 | |
| 349 | switch (colorspace) { |
| 350 | case JCS_GRAYSCALE: |
| 351 | cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ |
| 352 | cinfo->num_components = 1; |
| 353 | /* JFIF specifies component ID 1 */ |
| 354 | SET_COMP(0, 1, 1,1, 0, 0,0); |
| 355 | break; |
| 356 | case JCS_RGB: |
| 357 | cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */ |
| 358 | cinfo->num_components = 3; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 359 | SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0); |
| 360 | SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0); |
| 361 | SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 362 | break; |
| 363 | case JCS_YCbCr: |
| 364 | cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */ |
| 365 | cinfo->num_components = 3; |
| 366 | /* JFIF specifies component IDs 1,2,3 */ |
| 367 | /* We default to 2x2 subsamples of chrominance */ |
| 368 | SET_COMP(0, 1, 2,2, 0, 0,0); |
| 369 | SET_COMP(1, 2, 1,1, 1, 1,1); |
| 370 | SET_COMP(2, 3, 1,1, 1, 1,1); |
| 371 | break; |
| 372 | case JCS_CMYK: |
| 373 | cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */ |
| 374 | cinfo->num_components = 4; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 375 | SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0); |
| 376 | SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0); |
| 377 | SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0); |
| 378 | SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 379 | break; |
| 380 | case JCS_YCCK: |
| 381 | cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */ |
| 382 | cinfo->num_components = 4; |
| 383 | SET_COMP(0, 1, 2,2, 0, 0,0); |
| 384 | SET_COMP(1, 2, 1,1, 1, 1,1); |
| 385 | SET_COMP(2, 3, 1,1, 1, 1,1); |
| 386 | SET_COMP(3, 4, 2,2, 0, 0,0); |
| 387 | break; |
| 388 | case JCS_UNKNOWN: |
| 389 | cinfo->num_components = cinfo->input_components; |
| 390 | if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS) |
| 391 | ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 392 | MAX_COMPONENTS); |
Thomas G. Lane | 36a4ccc | 1994-09-24 00:00:00 +0000 | [diff] [blame] | 393 | for (ci = 0; ci < cinfo->num_components; ci++) { |
| 394 | SET_COMP(ci, ci, 1,1, 0, 0,0); |
| 395 | } |
| 396 | break; |
| 397 | default: |
| 398 | ERREXIT(cinfo, JERR_BAD_J_COLORSPACE); |
| 399 | } |
| 400 | } |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 401 | |
| 402 | |
| 403 | #ifdef C_PROGRESSIVE_SUPPORTED |
| 404 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 405 | LOCAL(jpeg_scan_info *) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 406 | fill_a_scan (jpeg_scan_info * scanptr, int ci, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 407 | int Ss, int Se, int Ah, int Al) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 408 | /* Support routine: generate one scan for specified component */ |
| 409 | { |
| 410 | scanptr->comps_in_scan = 1; |
| 411 | scanptr->component_index[0] = ci; |
| 412 | scanptr->Ss = Ss; |
| 413 | scanptr->Se = Se; |
| 414 | scanptr->Ah = Ah; |
| 415 | scanptr->Al = Al; |
| 416 | scanptr++; |
| 417 | return scanptr; |
| 418 | } |
| 419 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 420 | LOCAL(jpeg_scan_info *) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 421 | fill_scans (jpeg_scan_info * scanptr, int ncomps, |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 422 | int Ss, int Se, int Ah, int Al) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 423 | /* Support routine: generate one scan for each component */ |
| 424 | { |
| 425 | int ci; |
| 426 | |
| 427 | for (ci = 0; ci < ncomps; ci++) { |
| 428 | scanptr->comps_in_scan = 1; |
| 429 | scanptr->component_index[0] = ci; |
| 430 | scanptr->Ss = Ss; |
| 431 | scanptr->Se = Se; |
| 432 | scanptr->Ah = Ah; |
| 433 | scanptr->Al = Al; |
| 434 | scanptr++; |
| 435 | } |
| 436 | return scanptr; |
| 437 | } |
| 438 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 439 | LOCAL(jpeg_scan_info *) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 440 | fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al) |
| 441 | /* Support routine: generate interleaved DC scan if possible, else N scans */ |
| 442 | { |
| 443 | int ci; |
| 444 | |
| 445 | if (ncomps <= MAX_COMPS_IN_SCAN) { |
| 446 | /* Single interleaved DC scan */ |
| 447 | scanptr->comps_in_scan = ncomps; |
| 448 | for (ci = 0; ci < ncomps; ci++) |
| 449 | scanptr->component_index[ci] = ci; |
| 450 | scanptr->Ss = scanptr->Se = 0; |
| 451 | scanptr->Ah = Ah; |
| 452 | scanptr->Al = Al; |
| 453 | scanptr++; |
| 454 | } else { |
| 455 | /* Noninterleaved DC scan for each component */ |
| 456 | scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al); |
| 457 | } |
| 458 | return scanptr; |
| 459 | } |
| 460 | |
| 461 | |
| 462 | /* |
| 463 | * Create a recommended progressive-JPEG script. |
| 464 | * cinfo->num_components and cinfo->jpeg_color_space must be correct. |
| 465 | */ |
| 466 | |
Thomas G. Lane | 489583f | 1996-02-07 00:00:00 +0000 | [diff] [blame] | 467 | GLOBAL(void) |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 468 | jpeg_simple_progression (j_compress_ptr cinfo) |
| 469 | { |
| 470 | int ncomps = cinfo->num_components; |
| 471 | int nscans; |
| 472 | jpeg_scan_info * scanptr; |
| 473 | |
| 474 | /* Safety check to ensure start_compress not called yet. */ |
| 475 | if (cinfo->global_state != CSTATE_START) |
| 476 | ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state); |
| 477 | |
| 478 | /* Figure space needed for script. Calculation must match code below! */ |
| 479 | if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { |
| 480 | /* Custom script for YCbCr color images. */ |
| 481 | nscans = 10; |
| 482 | } else { |
| 483 | /* All-purpose script for other color spaces. */ |
| 484 | if (ncomps > MAX_COMPS_IN_SCAN) |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 485 | nscans = 6 * ncomps; /* 2 DC + 4 AC scans per component */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 486 | else |
DRC | e5eaf37 | 2014-05-09 18:00:32 +0000 | [diff] [blame] | 487 | nscans = 2 + 4 * ncomps; /* 2 DC scans; 4 AC scans per component */ |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 488 | } |
| 489 | |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 490 | /* Allocate space for script. |
| 491 | * We need to put it in the permanent pool in case the application performs |
| 492 | * multiple compressions without changing the settings. To avoid a memory |
| 493 | * leak if jpeg_simple_progression is called repeatedly for the same JPEG |
| 494 | * object, we try to re-use previously allocated space, and we allocate |
| 495 | * enough space to handle YCbCr even if initially asked for grayscale. |
| 496 | */ |
| 497 | if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) { |
| 498 | cinfo->script_space_size = MAX(nscans, 10); |
| 499 | cinfo->script_space = (jpeg_scan_info *) |
| 500 | (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT, |
DRC | 5de454b | 2014-05-18 19:04:03 +0000 | [diff] [blame^] | 501 | cinfo->script_space_size * sizeof(jpeg_scan_info)); |
Thomas G. Lane | 5ead57a | 1998-03-27 00:00:00 +0000 | [diff] [blame] | 502 | } |
| 503 | scanptr = cinfo->script_space; |
Thomas G. Lane | bc79e06 | 1995-08-02 00:00:00 +0000 | [diff] [blame] | 504 | cinfo->scan_info = scanptr; |
| 505 | cinfo->num_scans = nscans; |
| 506 | |
| 507 | if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) { |
| 508 | /* Custom script for YCbCr color images. */ |
| 509 | /* Initial DC scan */ |
| 510 | scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); |
| 511 | /* Initial AC scan: get some luma data out in a hurry */ |
| 512 | scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2); |
| 513 | /* Chroma data is too small to be worth expending many scans on */ |
| 514 | scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1); |
| 515 | scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1); |
| 516 | /* Complete spectral selection for luma AC */ |
| 517 | scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2); |
| 518 | /* Refine next bit of luma AC */ |
| 519 | scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1); |
| 520 | /* Finish DC successive approximation */ |
| 521 | scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); |
| 522 | /* Finish AC successive approximation */ |
| 523 | scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0); |
| 524 | scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0); |
| 525 | /* Luma bottom bit comes last since it's usually largest scan */ |
| 526 | scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0); |
| 527 | } else { |
| 528 | /* All-purpose script for other color spaces. */ |
| 529 | /* Successive approximation first pass */ |
| 530 | scanptr = fill_dc_scans(scanptr, ncomps, 0, 1); |
| 531 | scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2); |
| 532 | scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2); |
| 533 | /* Successive approximation second pass */ |
| 534 | scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1); |
| 535 | /* Successive approximation final pass */ |
| 536 | scanptr = fill_dc_scans(scanptr, ncomps, 1, 0); |
| 537 | scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0); |
| 538 | } |
| 539 | } |
| 540 | |
| 541 | #endif /* C_PROGRESSIVE_SUPPORTED */ |