LCOV - app.info - media/libjpeg/jcparam.c

LCOV - code coverage report
| Current view: | directory - media/libjpeg - jcparam.c (source / functions) |  | Found | Hit | Coverage |
| Test: | app.info | Lines: | 208 | 93 | 44.7 %
| Date: | 2012-04-21 | Functions: | 13 | 9 | 69.2 %

           1                 : /*
           2                 :  * jcparam.c
           3                 :  *
           4                 :  * Copyright (C) 1991-1998, Thomas G. Lane.
           5                 :  * Modified 2003-2008 by Guido Vollbeding.
           6                 :  * Copyright (C) 2009-2011, D. R. Commander.
           7                 :  * This file is part of the Independent JPEG Group's software.
           8                 :  * For conditions of distribution and use, see the accompanying README file.
           9                 :  *
          10                 :  * This file contains optional default-setting code for the JPEG compressor.
          11                 :  * Applications do not have to use this file, but those that don't use it
          12                 :  * must know a lot more about the innards of the JPEG code.
          13                 :  */
          14                 :
          15                 : #define JPEG_INTERNALS
          16                 : #include "jinclude.h"
          17                 : #include "jpeglib.h"
          18                 :
          19                 :
          20                 : /*
          21                 :  * Quantization table setup routines
          22                 :  */
          23                 :
          24                 : GLOBAL(void)
          25              12 : jpeg_add_quant_table (j_compress_ptr cinfo, int which_tbl,
          26                 :                       const unsigned int *basic_table,
          27                 :                       int scale_factor, boolean force_baseline)
          28                 : /* Define a quantization table equal to the basic_table times
          29                 :  * a scale factor (given as a percentage).
          30                 :  * If force_baseline is TRUE, the computed quantization table entries
          31                 :  * are limited to 1..255 for JPEG baseline compatibility.
          32                 :  */
          33                 : {
          34                 :   JQUANT_TBL ** qtblptr;
          35                 :   int i;
          36                 :   long temp;
          37                 :
          38                 :   /* Safety check to ensure start_compress not called yet. */
          39              12 :   if (cinfo->global_state != CSTATE_START)
          40               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
          41                 :
          42              12 :   if (which_tbl < 0 || which_tbl >= NUM_QUANT_TBLS)
          43               0 :     ERREXIT1(cinfo, JERR_DQT_INDEX, which_tbl);
          44                 :
          45              12 :   qtblptr = & cinfo->quant_tbl_ptrs[which_tbl];
          46                 :
          47              12 :   if (*qtblptr == NULL)
          48               6 :     *qtblptr = jpeg_alloc_quant_table((j_common_ptr) cinfo);
          49                 :
          50             780 :   for (i = 0; i < DCTSIZE2; i++) {
          51             768 :     temp = ((long) basic_table[i] * scale_factor + 50L) / 100L;
          52                 :     /* limit the values to the valid range */
          53             768 :     if (temp <= 0L) temp = 1L;
          54             768 :     if (temp > 32767L) temp = 32767L; /* max quantizer needed for 12 bits */
          55             768 :     if (force_baseline && temp > 255L)
          56               0 :       temp = 255L;              /* limit to baseline range if requested */
          57             768 :     (*qtblptr)->quantval[i] = (UINT16) temp;
          58                 :   }
          59                 :
          60                 :   /* Initialize sent_table FALSE so table will be written to JPEG file. */
          61              12 :   (*qtblptr)->sent_table = FALSE;
          62              12 : }
          63                 :
          64                 :
          65                 : /* These are the sample quantization tables given in JPEG spec section K.1.
          66                 :  * The spec says that the values given produce "good" quality, and
          67                 :  * when divided by 2, "very good" quality.
          68                 :  */
          69                 : static const unsigned int std_luminance_quant_tbl[DCTSIZE2] = {
          70                 :   16,  11,  10,  16,  24,  40,  51,  61,
          71                 :   12,  12,  14,  19,  26,  58,  60,  55,
          72                 :   14,  13,  16,  24,  40,  57,  69,  56,
          73                 :   14,  17,  22,  29,  51,  87,  80,  62,
          74                 :   18,  22,  37,  56,  68, 109, 103,  77,
          75                 :   24,  35,  55,  64,  81, 104, 113,  92,
          76                 :   49,  64,  78,  87, 103, 121, 120, 101,
          77                 :   72,  92,  95,  98, 112, 100, 103,  99
          78                 : };
          79                 : static const unsigned int std_chrominance_quant_tbl[DCTSIZE2] = {
          80                 :   17,  18,  24,  47,  99,  99,  99,  99,
          81                 :   18,  21,  26,  66,  99,  99,  99,  99,
          82                 :   24,  26,  56,  99,  99,  99,  99,  99,
          83                 :   47,  66,  99,  99,  99,  99,  99,  99,
          84                 :   99,  99,  99,  99,  99,  99,  99,  99,
          85                 :   99,  99,  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                 : };
          89                 :
          90                 :
          91                 : #if JPEG_LIB_VERSION >= 70
          92                 : GLOBAL(void)
          93                 : jpeg_default_qtables (j_compress_ptr cinfo, boolean force_baseline)
          94                 : /* Set or change the 'quality' (quantization) setting, using default tables
          95                 :  * and straight percentage-scaling quality scales.
          96                 :  * This entry point allows different scalings for luminance and chrominance.
          97                 :  */
          98                 : {
          99                 :   /* Set up two quantization tables using the specified scaling */
         100                 :   jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
         101                 :                        cinfo->q_scale_factor[0], force_baseline);
         102                 :   jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
         103                 :                        cinfo->q_scale_factor[1], force_baseline);
         104                 : }
         105                 : #endif
         106                 :
         107                 :
         108                 : GLOBAL(void)
         109               6 : jpeg_set_linear_quality (j_compress_ptr cinfo, int scale_factor,
         110                 :                          boolean force_baseline)
         111                 : /* Set or change the 'quality' (quantization) setting, using default tables
         112                 :  * and a straight percentage-scaling quality scale.  In most cases it's better
         113                 :  * to use jpeg_set_quality (below); this entry point is provided for
         114                 :  * applications that insist on a linear percentage scaling.
         115                 :  */
         116                 : {
         117                 :   /* Set up two quantization tables using the specified scaling */
         118               6 :   jpeg_add_quant_table(cinfo, 0, std_luminance_quant_tbl,
         119                 :                        scale_factor, force_baseline);
         120               6 :   jpeg_add_quant_table(cinfo, 1, std_chrominance_quant_tbl,
         121                 :                        scale_factor, force_baseline);
         122               6 : }
         123                 :
         124                 :
         125                 : GLOBAL(int)
         126               6 : jpeg_quality_scaling (int quality)
         127                 : /* Convert a user-specified quality rating to a percentage scaling factor
         128                 :  * for an underlying quantization table, using our recommended scaling curve.
         129                 :  * The input 'quality' factor should be 0 (terrible) to 100 (very good).
         130                 :  */
         131                 : {
         132                 :   /* Safety limit on quality factor.  Convert 0 to 1 to avoid zero divide. */
         133               6 :   if (quality <= 0) quality = 1;
         134               6 :   if (quality > 100) quality = 100;
         135                 :
         136                 :   /* The basic table is used as-is (scaling 100) for a quality of 50.
         137                 :    * Qualities 50..100 are converted to scaling percentage 200 - 2*Q;
         138                 :    * note that at Q=100 the scaling is 0, which will cause jpeg_add_quant_table
         139                 :    * to make all the table entries 1 (hence, minimum quantization loss).
         140                 :    * Qualities 1..50 are converted to scaling percentage 5000/Q.
         141                 :    */
         142               6 :   if (quality < 50)
         143               0 :     quality = 5000 / quality;
         144                 :   else
         145               6 :     quality = 200 - quality*2;
         146                 :
         147               6 :   return quality;
         148                 : }
         149                 :
         150                 :
         151                 : GLOBAL(void)
         152               6 : jpeg_set_quality (j_compress_ptr cinfo, int quality, boolean force_baseline)
         153                 : /* Set or change the 'quality' (quantization) setting, using default tables.
         154                 :  * This is the standard quality-adjusting entry point for typical user
         155                 :  * interfaces; only those who want detailed control over quantization tables
         156                 :  * would use the preceding three routines directly.
         157                 :  */
         158                 : {
         159                 :   /* Convert user 0-100 rating to percentage scaling */
         160               6 :   quality = jpeg_quality_scaling(quality);
         161                 :
         162                 :   /* Set up standard quality tables */
         163               6 :   jpeg_set_linear_quality(cinfo, quality, force_baseline);
         164               6 : }
         165                 :
         166                 :
         167                 : /*
         168                 :  * Huffman table setup routines
         169                 :  */
         170                 :
         171                 : LOCAL(void)
         172              12 : add_huff_table (j_compress_ptr cinfo,
         173                 :                 JHUFF_TBL **htblptr, const UINT8 *bits, const UINT8 *val)
         174                 : /* Define a Huffman table */
         175                 : {
         176                 :   int nsymbols, len;
         177                 :
         178              12 :   if (*htblptr == NULL)
         179              12 :     *htblptr = jpeg_alloc_huff_table((j_common_ptr) cinfo);
         180                 :
         181                 :   /* Copy the number-of-symbols-of-each-code-length counts */
         182              12 :   MEMCOPY((*htblptr)->bits, bits, SIZEOF((*htblptr)->bits));
         183                 :
         184                 :   /* Validate the counts.  We do this here mainly so we can copy the right
         185                 :    * number of symbols from the val[] array, without risking marching off
         186                 :    * the end of memory.  jchuff.c will do a more thorough test later.
         187                 :    */
         188              12 :   nsymbols = 0;
         189             204 :   for (len = 1; len <= 16; len++)
         190             192 :     nsymbols += bits[len];
         191              12 :   if (nsymbols < 1 || nsymbols > 256)
         192               0 :     ERREXIT(cinfo, JERR_BAD_HUFF_TABLE);
         193                 :
         194              12 :   MEMCOPY((*htblptr)->huffval, val, nsymbols * SIZEOF(UINT8));
         195                 :
         196                 :   /* Initialize sent_table FALSE so table will be written to JPEG file. */
         197              12 :   (*htblptr)->sent_table = FALSE;
         198              12 : }
         199                 :
         200                 :
         201                 : LOCAL(void)
         202               3 : std_huff_tables (j_compress_ptr cinfo)
         203                 : /* Set up the standard Huffman tables (cf. JPEG standard section K.3) */
         204                 : /* IMPORTANT: these are only valid for 8-bit data precision! */
         205                 : {
         206                 :   static const UINT8 bits_dc_luminance[17] =
         207                 :     { /* 0-base */ 0, 0, 1, 5, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, 0 };
         208                 :   static const UINT8 val_dc_luminance[] =
         209                 :     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
         210                 :
         211                 :   static const UINT8 bits_dc_chrominance[17] =
         212                 :     { /* 0-base */ 0, 0, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0 };
         213                 :   static const UINT8 val_dc_chrominance[] =
         214                 :     { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 };
         215                 :
         216                 :   static const UINT8 bits_ac_luminance[17] =
         217                 :     { /* 0-base */ 0, 0, 2, 1, 3, 3, 2, 4, 3, 5, 5, 4, 4, 0, 0, 1, 0x7d };
         218                 :   static const UINT8 val_ac_luminance[] =
         219                 :     { 0x01, 0x02, 0x03, 0x00, 0x04, 0x11, 0x05, 0x12,
         220                 :       0x21, 0x31, 0x41, 0x06, 0x13, 0x51, 0x61, 0x07,
         221                 :       0x22, 0x71, 0x14, 0x32, 0x81, 0x91, 0xa1, 0x08,
         222                 :       0x23, 0x42, 0xb1, 0xc1, 0x15, 0x52, 0xd1, 0xf0,
         223                 :       0x24, 0x33, 0x62, 0x72, 0x82, 0x09, 0x0a, 0x16,
         224                 :       0x17, 0x18, 0x19, 0x1a, 0x25, 0x26, 0x27, 0x28,
         225                 :       0x29, 0x2a, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39,
         226                 :       0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49,
         227                 :       0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59,
         228                 :       0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69,
         229                 :       0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79,
         230                 :       0x7a, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89,
         231                 :       0x8a, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98,
         232                 :       0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7,
         233                 :       0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6,
         234                 :       0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3, 0xc4, 0xc5,
         235                 :       0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2, 0xd3, 0xd4,
         236                 :       0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xe1, 0xe2,
         237                 :       0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
         238                 :       0xf1, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
         239                 :       0xf9, 0xfa };
         240                 :
         241                 :   static const UINT8 bits_ac_chrominance[17] =
         242                 :     { /* 0-base */ 0, 0, 2, 1, 2, 4, 4, 3, 4, 7, 5, 4, 4, 0, 1, 2, 0x77 };
         243                 :   static const UINT8 val_ac_chrominance[] =
         244                 :     { 0x00, 0x01, 0x02, 0x03, 0x11, 0x04, 0x05, 0x21,
         245                 :       0x31, 0x06, 0x12, 0x41, 0x51, 0x07, 0x61, 0x71,
         246                 :       0x13, 0x22, 0x32, 0x81, 0x08, 0x14, 0x42, 0x91,
         247                 :       0xa1, 0xb1, 0xc1, 0x09, 0x23, 0x33, 0x52, 0xf0,
         248                 :       0x15, 0x62, 0x72, 0xd1, 0x0a, 0x16, 0x24, 0x34,
         249                 :       0xe1, 0x25, 0xf1, 0x17, 0x18, 0x19, 0x1a, 0x26,
         250                 :       0x27, 0x28, 0x29, 0x2a, 0x35, 0x36, 0x37, 0x38,
         251                 :       0x39, 0x3a, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48,
         252                 :       0x49, 0x4a, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58,
         253                 :       0x59, 0x5a, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
         254                 :       0x69, 0x6a, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
         255                 :       0x79, 0x7a, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87,
         256                 :       0x88, 0x89, 0x8a, 0x92, 0x93, 0x94, 0x95, 0x96,
         257                 :       0x97, 0x98, 0x99, 0x9a, 0xa2, 0xa3, 0xa4, 0xa5,
         258                 :       0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xb2, 0xb3, 0xb4,
         259                 :       0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xc2, 0xc3,
         260                 :       0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc9, 0xca, 0xd2,
         261                 :       0xd3, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda,
         262                 :       0xe2, 0xe3, 0xe4, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9,
         263                 :       0xea, 0xf2, 0xf3, 0xf4, 0xf5, 0xf6, 0xf7, 0xf8,
         264                 :       0xf9, 0xfa };
         265                 :
         266               3 :   add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[0],
         267                 :                  bits_dc_luminance, val_dc_luminance);
         268               3 :   add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[0],
         269                 :                  bits_ac_luminance, val_ac_luminance);
         270               3 :   add_huff_table(cinfo, &cinfo->dc_huff_tbl_ptrs[1],
         271                 :                  bits_dc_chrominance, val_dc_chrominance);
         272               3 :   add_huff_table(cinfo, &cinfo->ac_huff_tbl_ptrs[1],
         273                 :                  bits_ac_chrominance, val_ac_chrominance);
         274               3 : }
         275                 :
         276                 :
         277                 : /*
         278                 :  * Default parameter setup for compression.
         279                 :  *
         280                 :  * Applications that don't choose to use this routine must do their
         281                 :  * own setup of all these parameters.  Alternately, you can call this
         282                 :  * to establish defaults and then alter parameters selectively.  This
         283                 :  * is the recommended approach since, if we add any new parameters,
         284                 :  * your code will still work (they'll be set to reasonable defaults).
         285                 :  */
         286                 :
         287                 : GLOBAL(void)
         288               3 : jpeg_set_defaults (j_compress_ptr cinfo)
         289                 : {
         290                 :   int i;
         291                 :
         292                 :   /* Safety check to ensure start_compress not called yet. */
         293               3 :   if (cinfo->global_state != CSTATE_START)
         294               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
         295                 :
         296                 :   /* Allocate comp_info array large enough for maximum component count.
         297                 :    * Array is made permanent in case application wants to compress
         298                 :    * multiple images at same param settings.
         299                 :    */
         300               3 :   if (cinfo->comp_info == NULL)
         301               3 :     cinfo->comp_info = (jpeg_component_info *)
         302               3 :       (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
         303                 :                                   MAX_COMPONENTS * SIZEOF(jpeg_component_info));
         304                 :
         305                 :   /* Initialize everything not dependent on the color space */
         306                 :
         307                 : #if JPEG_LIB_VERSION >= 70
         308                 :   cinfo->scale_num = 1;              /* 1:1 scaling */
         309                 :   cinfo->scale_denom = 1;
         310                 : #endif
         311               3 :   cinfo->data_precision = BITS_IN_JSAMPLE;
         312                 :   /* Set up two quantization tables using default quality of 75 */
         313               3 :   jpeg_set_quality(cinfo, 75, TRUE);
         314                 :   /* Set up two Huffman tables */
         315               3 :   std_huff_tables(cinfo);
         316                 :
         317                 :   /* Initialize default arithmetic coding conditioning */
         318              51 :   for (i = 0; i < NUM_ARITH_TBLS; i++) {
         319              48 :     cinfo->arith_dc_L[i] = 0;
         320              48 :     cinfo->arith_dc_U[i] = 1;
         321              48 :     cinfo->arith_ac_K[i] = 5;
         322                 :   }
         323                 :
         324                 :   /* Default is no multiple-scan output */
         325               3 :   cinfo->scan_info = NULL;
         326               3 :   cinfo->num_scans = 0;
         327                 :
         328                 :   /* Expect normal source image, not raw downsampled data */
         329               3 :   cinfo->raw_data_in = FALSE;
         330                 :
         331                 :   /* Use Huffman coding, not arithmetic coding, by default */
         332               3 :   cinfo->arith_code = FALSE;
         333                 :
         334                 :   /* By default, don't do extra passes to optimize entropy coding */
         335               3 :   cinfo->optimize_coding = FALSE;
         336                 :   /* The standard Huffman tables are only valid for 8-bit data precision.
         337                 :    * If the precision is higher, force optimization on so that usable
         338                 :    * tables will be computed.  This test can be removed if default tables
         339                 :    * are supplied that are valid for the desired precision.
         340                 :    */
         341               3 :   if (cinfo->data_precision > 8)
         342               0 :     cinfo->optimize_coding = TRUE;
         343                 :
         344                 :   /* By default, use the simpler non-cosited sampling alignment */
         345               3 :   cinfo->CCIR601_sampling = FALSE;
         346                 :
         347                 : #if JPEG_LIB_VERSION >= 70
         348                 :   /* By default, apply fancy downsampling */
         349                 :   cinfo->do_fancy_downsampling = TRUE;
         350                 : #endif
         351                 :
         352                 :   /* No input smoothing */
         353               3 :   cinfo->smoothing_factor = 0;
         354                 :
         355                 :   /* DCT algorithm preference */
         356               3 :   cinfo->dct_method = JDCT_DEFAULT;
         357                 :
         358                 :   /* No restart markers */
         359               3 :   cinfo->restart_interval = 0;
         360               3 :   cinfo->restart_in_rows = 0;
         361                 :
         362                 :   /* Fill in default JFIF marker parameters.  Note that whether the marker
         363                 :    * will actually be written is determined by jpeg_set_colorspace.
         364                 :    *
         365                 :    * By default, the library emits JFIF version code 1.01.
         366                 :    * An application that wants to emit JFIF 1.02 extension markers should set
         367                 :    * JFIF_minor_version to 2.  We could probably get away with just defaulting
         368                 :    * to 1.02, but there may still be some decoders in use that will complain
         369                 :    * about that; saying 1.01 should minimize compatibility problems.
         370                 :    */
         371               3 :   cinfo->JFIF_major_version = 1; /* Default JFIF version = 1.01 */
         372               3 :   cinfo->JFIF_minor_version = 1;
         373               3 :   cinfo->density_unit = 0;   /* Pixel size is unknown by default */
         374               3 :   cinfo->X_density = 1;              /* Pixel aspect ratio is square by default */
         375               3 :   cinfo->Y_density = 1;
         376                 :
         377                 :   /* Choose JPEG colorspace based on input space, set defaults accordingly */
         378                 :
         379               3 :   jpeg_default_colorspace(cinfo);
         380               3 : }
         381                 :
         382                 :
         383                 : /*
         384                 :  * Select an appropriate JPEG colorspace for in_color_space.
         385                 :  */
         386                 :
         387                 : GLOBAL(void)
         388               3 : jpeg_default_colorspace (j_compress_ptr cinfo)
         389                 : {
         390               3 :   switch (cinfo->in_color_space) {
         391                 :   case JCS_GRAYSCALE:
         392               0 :     jpeg_set_colorspace(cinfo, JCS_GRAYSCALE);
         393               0 :     break;
         394                 :   case JCS_RGB:
         395                 :   case JCS_EXT_RGB:
         396                 :   case JCS_EXT_RGBX:
         397                 :   case JCS_EXT_BGR:
         398                 :   case JCS_EXT_BGRX:
         399                 :   case JCS_EXT_XBGR:
         400                 :   case JCS_EXT_XRGB:
         401                 :   case JCS_EXT_RGBA:
         402                 :   case JCS_EXT_BGRA:
         403                 :   case JCS_EXT_ABGR:
         404                 :   case JCS_EXT_ARGB:
         405               3 :     jpeg_set_colorspace(cinfo, JCS_YCbCr);
         406               3 :     break;
         407                 :   case JCS_YCbCr:
         408               0 :     jpeg_set_colorspace(cinfo, JCS_YCbCr);
         409               0 :     break;
         410                 :   case JCS_CMYK:
         411               0 :     jpeg_set_colorspace(cinfo, JCS_CMYK); /* By default, no translation */
         412               0 :     break;
         413                 :   case JCS_YCCK:
         414               0 :     jpeg_set_colorspace(cinfo, JCS_YCCK);
         415               0 :     break;
         416                 :   case JCS_UNKNOWN:
         417               0 :     jpeg_set_colorspace(cinfo, JCS_UNKNOWN);
         418               0 :     break;
         419                 :   default:
         420               0 :     ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
         421                 :   }
         422               3 : }
         423                 :
         424                 :
         425                 : /*
         426                 :  * Set the JPEG colorspace, and choose colorspace-dependent default values.
         427                 :  */
         428                 :
         429                 : GLOBAL(void)
         430               3 : jpeg_set_colorspace (j_compress_ptr cinfo, J_COLOR_SPACE colorspace)
         431                 : {
         432                 :   jpeg_component_info * compptr;
         433                 :   int ci;
         434                 :
         435                 : #define SET_COMP(index,id,hsamp,vsamp,quant,dctbl,actbl)  \
         436                 :   (compptr = &cinfo->comp_info[index], \
         437                 :    compptr->component_id = (id), \
         438                 :    compptr->h_samp_factor = (hsamp), \
         439                 :    compptr->v_samp_factor = (vsamp), \
         440                 :    compptr->quant_tbl_no = (quant), \
         441                 :    compptr->dc_tbl_no = (dctbl), \
         442                 :    compptr->ac_tbl_no = (actbl) )
         443                 :
         444                 :   /* Safety check to ensure start_compress not called yet. */
         445               3 :   if (cinfo->global_state != CSTATE_START)
         446               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
         447                 :
         448                 :   /* For all colorspaces, we use Q and Huff tables 0 for luminance components,
         449                 :    * tables 1 for chrominance components.
         450                 :    */
         451                 :
         452               3 :   cinfo->jpeg_color_space = colorspace;
         453                 :
         454               3 :   cinfo->write_JFIF_header = FALSE; /* No marker for non-JFIF colorspaces */
         455               3 :   cinfo->write_Adobe_marker = FALSE; /* write no Adobe marker by default */
         456                 :
         457               3 :   switch (colorspace) {
         458                 :   case JCS_GRAYSCALE:
         459               0 :     cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
         460               0 :     cinfo->num_components = 1;
         461                 :     /* JFIF specifies component ID 1 */
         462               0 :     SET_COMP(0, 1, 1,1, 0, 0,0);
         463               0 :     break;
         464                 :   case JCS_RGB:
         465               0 :     cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag RGB */
         466               0 :     cinfo->num_components = 3;
         467               0 :     SET_COMP(0, 0x52 /* 'R' */, 1,1, 0, 0,0);
         468               0 :     SET_COMP(1, 0x47 /* 'G' */, 1,1, 0, 0,0);
         469               0 :     SET_COMP(2, 0x42 /* 'B' */, 1,1, 0, 0,0);
         470               0 :     break;
         471                 :   case JCS_YCbCr:
         472               3 :     cinfo->write_JFIF_header = TRUE; /* Write a JFIF marker */
         473               3 :     cinfo->num_components = 3;
         474                 :     /* JFIF specifies component IDs 1,2,3 */
         475                 :     /* We default to 2x2 subsamples of chrominance */
         476               3 :     SET_COMP(0, 1, 2,2, 0, 0,0);
         477               3 :     SET_COMP(1, 2, 1,1, 1, 1,1);
         478               3 :     SET_COMP(2, 3, 1,1, 1, 1,1);
         479               3 :     break;
         480                 :   case JCS_CMYK:
         481               0 :     cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag CMYK */
         482               0 :     cinfo->num_components = 4;
         483               0 :     SET_COMP(0, 0x43 /* 'C' */, 1,1, 0, 0,0);
         484               0 :     SET_COMP(1, 0x4D /* 'M' */, 1,1, 0, 0,0);
         485               0 :     SET_COMP(2, 0x59 /* 'Y' */, 1,1, 0, 0,0);
         486               0 :     SET_COMP(3, 0x4B /* 'K' */, 1,1, 0, 0,0);
         487               0 :     break;
         488                 :   case JCS_YCCK:
         489               0 :     cinfo->write_Adobe_marker = TRUE; /* write Adobe marker to flag YCCK */
         490               0 :     cinfo->num_components = 4;
         491               0 :     SET_COMP(0, 1, 2,2, 0, 0,0);
         492               0 :     SET_COMP(1, 2, 1,1, 1, 1,1);
         493               0 :     SET_COMP(2, 3, 1,1, 1, 1,1);
         494               0 :     SET_COMP(3, 4, 2,2, 0, 0,0);
         495               0 :     break;
         496                 :   case JCS_UNKNOWN:
         497               0 :     cinfo->num_components = cinfo->input_components;
         498               0 :     if (cinfo->num_components < 1 || cinfo->num_components > MAX_COMPONENTS)
         499               0 :       ERREXIT2(cinfo, JERR_COMPONENT_COUNT, cinfo->num_components,
         500                 :                MAX_COMPONENTS);
         501               0 :     for (ci = 0; ci < cinfo->num_components; ci++) {
         502               0 :       SET_COMP(ci, ci, 1,1, 0, 0,0);
         503                 :     }
         504               0 :     break;
         505                 :   default:
         506               0 :     ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
         507                 :   }
         508               3 : }
         509                 :
         510                 :
         511                 : #ifdef C_PROGRESSIVE_SUPPORTED
         512                 :
         513                 : LOCAL(jpeg_scan_info *)
         514               0 : fill_a_scan (jpeg_scan_info * scanptr, int ci,
         515                 :              int Ss, int Se, int Ah, int Al)
         516                 : /* Support routine: generate one scan for specified component */
         517                 : {
         518               0 :   scanptr->comps_in_scan = 1;
         519               0 :   scanptr->component_index[0] = ci;
         520               0 :   scanptr->Ss = Ss;
         521               0 :   scanptr->Se = Se;
         522               0 :   scanptr->Ah = Ah;
         523               0 :   scanptr->Al = Al;
         524               0 :   scanptr++;
         525               0 :   return scanptr;
         526                 : }
         527                 :
         528                 : LOCAL(jpeg_scan_info *)
         529               0 : fill_scans (jpeg_scan_info * scanptr, int ncomps,
         530                 :             int Ss, int Se, int Ah, int Al)
         531                 : /* Support routine: generate one scan for each component */
         532                 : {
         533                 :   int ci;
         534                 :
         535               0 :   for (ci = 0; ci < ncomps; ci++) {
         536               0 :     scanptr->comps_in_scan = 1;
         537               0 :     scanptr->component_index[0] = ci;
         538               0 :     scanptr->Ss = Ss;
         539               0 :     scanptr->Se = Se;
         540               0 :     scanptr->Ah = Ah;
         541               0 :     scanptr->Al = Al;
         542               0 :     scanptr++;
         543                 :   }
         544               0 :   return scanptr;
         545                 : }
         546                 :
         547                 : LOCAL(jpeg_scan_info *)
         548               0 : fill_dc_scans (jpeg_scan_info * scanptr, int ncomps, int Ah, int Al)
         549                 : /* Support routine: generate interleaved DC scan if possible, else N scans */
         550                 : {
         551                 :   int ci;
         552                 :
         553               0 :   if (ncomps <= MAX_COMPS_IN_SCAN) {
         554                 :     /* Single interleaved DC scan */
         555               0 :     scanptr->comps_in_scan = ncomps;
         556               0 :     for (ci = 0; ci < ncomps; ci++)
         557               0 :       scanptr->component_index[ci] = ci;
         558               0 :     scanptr->Ss = scanptr->Se = 0;
         559               0 :     scanptr->Ah = Ah;
         560               0 :     scanptr->Al = Al;
         561               0 :     scanptr++;
         562                 :   } else {
         563                 :     /* Noninterleaved DC scan for each component */
         564               0 :     scanptr = fill_scans(scanptr, ncomps, 0, 0, Ah, Al);
         565                 :   }
         566               0 :   return scanptr;
         567                 : }
         568                 :
         569                 :
         570                 : /*
         571                 :  * Create a recommended progressive-JPEG script.
         572                 :  * cinfo->num_components and cinfo->jpeg_color_space must be correct.
         573                 :  */
         574                 :
         575                 : GLOBAL(void)
         576               0 : jpeg_simple_progression (j_compress_ptr cinfo)
         577                 : {
         578               0 :   int ncomps = cinfo->num_components;
         579                 :   int nscans;
         580                 :   jpeg_scan_info * scanptr;
         581                 :
         582                 :   /* Safety check to ensure start_compress not called yet. */
         583               0 :   if (cinfo->global_state != CSTATE_START)
         584               0 :     ERREXIT1(cinfo, JERR_BAD_STATE, cinfo->global_state);
         585                 :
         586                 :   /* Figure space needed for script.  Calculation must match code below! */
         587               0 :   if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
         588                 :     /* Custom script for YCbCr color images. */
         589               0 :     nscans = 10;
         590                 :   } else {
         591                 :     /* All-purpose script for other color spaces. */
         592               0 :     if (ncomps > MAX_COMPS_IN_SCAN)
         593               0 :       nscans = 6 * ncomps;      /* 2 DC + 4 AC scans per component */
         594                 :     else
         595               0 :       nscans = 2 + 4 * ncomps;  /* 2 DC scans; 4 AC scans per component */
         596                 :   }
         597                 :
         598                 :   /* Allocate space for script.
         599                 :    * We need to put it in the permanent pool in case the application performs
         600                 :    * multiple compressions without changing the settings.  To avoid a memory
         601                 :    * leak if jpeg_simple_progression is called repeatedly for the same JPEG
         602                 :    * object, we try to re-use previously allocated space, and we allocate
         603                 :    * enough space to handle YCbCr even if initially asked for grayscale.
         604                 :    */
         605               0 :   if (cinfo->script_space == NULL || cinfo->script_space_size < nscans) {
         606               0 :     cinfo->script_space_size = MAX(nscans, 10);
         607               0 :     cinfo->script_space = (jpeg_scan_info *)
         608               0 :       (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_PERMANENT,
         609               0 :                         cinfo->script_space_size * SIZEOF(jpeg_scan_info));
         610                 :   }
         611               0 :   scanptr = cinfo->script_space;
         612               0 :   cinfo->scan_info = scanptr;
         613               0 :   cinfo->num_scans = nscans;
         614                 :
         615               0 :   if (ncomps == 3 && cinfo->jpeg_color_space == JCS_YCbCr) {
         616                 :     /* Custom script for YCbCr color images. */
         617                 :     /* Initial DC scan */
         618               0 :     scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
         619                 :     /* Initial AC scan: get some luma data out in a hurry */
         620               0 :     scanptr = fill_a_scan(scanptr, 0, 1, 5, 0, 2);
         621                 :     /* Chroma data is too small to be worth expending many scans on */
         622               0 :     scanptr = fill_a_scan(scanptr, 2, 1, 63, 0, 1);
         623               0 :     scanptr = fill_a_scan(scanptr, 1, 1, 63, 0, 1);
         624                 :     /* Complete spectral selection for luma AC */
         625               0 :     scanptr = fill_a_scan(scanptr, 0, 6, 63, 0, 2);
         626                 :     /* Refine next bit of luma AC */
         627               0 :     scanptr = fill_a_scan(scanptr, 0, 1, 63, 2, 1);
         628                 :     /* Finish DC successive approximation */
         629               0 :     scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
         630                 :     /* Finish AC successive approximation */
         631               0 :     scanptr = fill_a_scan(scanptr, 2, 1, 63, 1, 0);
         632               0 :     scanptr = fill_a_scan(scanptr, 1, 1, 63, 1, 0);
         633                 :     /* Luma bottom bit comes last since it's usually largest scan */
         634               0 :     scanptr = fill_a_scan(scanptr, 0, 1, 63, 1, 0);
         635                 :   } else {
         636                 :     /* All-purpose script for other color spaces. */
         637                 :     /* Successive approximation first pass */
         638               0 :     scanptr = fill_dc_scans(scanptr, ncomps, 0, 1);
         639               0 :     scanptr = fill_scans(scanptr, ncomps, 1, 5, 0, 2);
         640               0 :     scanptr = fill_scans(scanptr, ncomps, 6, 63, 0, 2);
         641                 :     /* Successive approximation second pass */
         642               0 :     scanptr = fill_scans(scanptr, ncomps, 1, 63, 2, 1);
         643                 :     /* Successive approximation final pass */
         644               0 :     scanptr = fill_dc_scans(scanptr, ncomps, 1, 0);
         645               0 :     scanptr = fill_scans(scanptr, ncomps, 1, 63, 1, 0);
         646                 :   }
         647               0 : }
         648                 :
         649                 : #endif /* C_PROGRESSIVE_SUPPORTED */

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