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: 2012-06-02 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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