LCOV - code coverage report
Current view: directory - media/libjpeg - jccolor.c (source / functions) Found Hit Coverage
Test: app.info Lines: 181 17 9.4 %
Date: 2012-06-02 Functions: 8 2 25.0 %

       1                 : /*
       2                 :  * jccolor.c
       3                 :  *
       4                 :  * Copyright (C) 1991-1996, Thomas G. Lane.
       5                 :  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
       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 input colorspace conversion routines.
      11                 :  */
      12                 : 
      13                 : #define JPEG_INTERNALS
      14                 : #include "jinclude.h"
      15                 : #include "jpeglib.h"
      16                 : #include "jsimd.h"
      17                 : #include "config.h"
      18                 : 
      19                 : 
      20                 : /* Private subobject */
      21                 : 
      22                 : typedef struct {
      23                 :   struct jpeg_color_converter pub; /* public fields */
      24                 : 
      25                 :   /* Private state for RGB->YCC conversion */
      26                 :   INT32 * rgb_ycc_tab;          /* => table for RGB to YCbCr conversion */
      27                 : } my_color_converter;
      28                 : 
      29                 : typedef my_color_converter * my_cconvert_ptr;
      30                 : 
      31                 : 
      32                 : /**************** RGB -> YCbCr conversion: most common case **************/
      33                 : 
      34                 : /*
      35                 :  * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
      36                 :  * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
      37                 :  * The conversion equations to be implemented are therefore
      38                 :  *      Y  =  0.29900 * R + 0.58700 * G + 0.11400 * B
      39                 :  *      Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B  + CENTERJSAMPLE
      40                 :  *      Cr =  0.50000 * R - 0.41869 * G - 0.08131 * B  + CENTERJSAMPLE
      41                 :  * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
      42                 :  * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
      43                 :  * rather than CENTERJSAMPLE, for Cb and Cr.  This gave equal positive and
      44                 :  * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
      45                 :  * were not represented exactly.  Now we sacrifice exact representation of
      46                 :  * maximum red and maximum blue in order to get exact grayscales.
      47                 :  *
      48                 :  * To avoid floating-point arithmetic, we represent the fractional constants
      49                 :  * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
      50                 :  * the products by 2^16, with appropriate rounding, to get the correct answer.
      51                 :  *
      52                 :  * For even more speed, we avoid doing any multiplications in the inner loop
      53                 :  * by precalculating the constants times R,G,B for all possible values.
      54                 :  * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
      55                 :  * for 12-bit samples it is still acceptable.  It's not very reasonable for
      56                 :  * 16-bit samples, but if you want lossless storage you shouldn't be changing
      57                 :  * colorspace anyway.
      58                 :  * The CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
      59                 :  * in the tables to save adding them separately in the inner loop.
      60                 :  */
      61                 : 
      62                 : #define SCALEBITS       16      /* speediest right-shift on some machines */
      63                 : #define CBCR_OFFSET     ((INT32) CENTERJSAMPLE << SCALEBITS)
      64                 : #define ONE_HALF        ((INT32) 1 << (SCALEBITS-1))
      65                 : #define FIX(x)          ((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
      66                 : 
      67                 : /* We allocate one big table and divide it up into eight parts, instead of
      68                 :  * doing eight alloc_small requests.  This lets us use a single table base
      69                 :  * address, which can be held in a register in the inner loops on many
      70                 :  * machines (more than can hold all eight addresses, anyway).
      71                 :  */
      72                 : 
      73                 : #define R_Y_OFF         0                       /* offset to R => Y section */
      74                 : #define G_Y_OFF         (1*(MAXJSAMPLE+1))      /* offset to G => Y section */
      75                 : #define B_Y_OFF         (2*(MAXJSAMPLE+1))      /* etc. */
      76                 : #define R_CB_OFF        (3*(MAXJSAMPLE+1))
      77                 : #define G_CB_OFF        (4*(MAXJSAMPLE+1))
      78                 : #define B_CB_OFF        (5*(MAXJSAMPLE+1))
      79                 : #define R_CR_OFF        B_CB_OFF                /* B=>Cb, R=>Cr are the same */
      80                 : #define G_CR_OFF        (6*(MAXJSAMPLE+1))
      81                 : #define B_CR_OFF        (7*(MAXJSAMPLE+1))
      82                 : #define TABLE_SIZE      (8*(MAXJSAMPLE+1))
      83                 : 
      84                 : 
      85                 : /* Include inline routines for colorspace extensions */
      86                 : 
      87                 : #include "jccolext.c"
      88                 : #undef RGB_RED
      89                 : #undef RGB_GREEN
      90                 : #undef RGB_BLUE
      91                 : #undef RGB_PIXELSIZE
      92                 : 
      93                 : #define RGB_RED EXT_RGB_RED
      94                 : #define RGB_GREEN EXT_RGB_GREEN
      95                 : #define RGB_BLUE EXT_RGB_BLUE
      96                 : #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
      97                 : #define rgb_ycc_convert_internal extrgb_ycc_convert_internal
      98                 : #define rgb_gray_convert_internal extrgb_gray_convert_internal
      99                 : #include "jccolext.c"
     100                 : #undef RGB_RED
     101                 : #undef RGB_GREEN
     102                 : #undef RGB_BLUE
     103                 : #undef RGB_PIXELSIZE
     104                 : #undef rgb_ycc_convert_internal
     105                 : #undef rgb_gray_convert_internal
     106                 : 
     107                 : #define RGB_RED EXT_RGBX_RED
     108                 : #define RGB_GREEN EXT_RGBX_GREEN
     109                 : #define RGB_BLUE EXT_RGBX_BLUE
     110                 : #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
     111                 : #define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
     112                 : #define rgb_gray_convert_internal extrgbx_gray_convert_internal
     113                 : #include "jccolext.c"
     114                 : #undef RGB_RED
     115                 : #undef RGB_GREEN
     116                 : #undef RGB_BLUE
     117                 : #undef RGB_PIXELSIZE
     118                 : #undef rgb_ycc_convert_internal
     119                 : #undef rgb_gray_convert_internal
     120                 : 
     121                 : #define RGB_RED EXT_BGR_RED
     122                 : #define RGB_GREEN EXT_BGR_GREEN
     123                 : #define RGB_BLUE EXT_BGR_BLUE
     124                 : #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
     125                 : #define rgb_ycc_convert_internal extbgr_ycc_convert_internal
     126                 : #define rgb_gray_convert_internal extbgr_gray_convert_internal
     127                 : #include "jccolext.c"
     128                 : #undef RGB_RED
     129                 : #undef RGB_GREEN
     130                 : #undef RGB_BLUE
     131                 : #undef RGB_PIXELSIZE
     132                 : #undef rgb_ycc_convert_internal
     133                 : #undef rgb_gray_convert_internal
     134                 : 
     135                 : #define RGB_RED EXT_BGRX_RED
     136                 : #define RGB_GREEN EXT_BGRX_GREEN
     137                 : #define RGB_BLUE EXT_BGRX_BLUE
     138                 : #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
     139                 : #define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
     140                 : #define rgb_gray_convert_internal extbgrx_gray_convert_internal
     141                 : #include "jccolext.c"
     142                 : #undef RGB_RED
     143                 : #undef RGB_GREEN
     144                 : #undef RGB_BLUE
     145                 : #undef RGB_PIXELSIZE
     146                 : #undef rgb_ycc_convert_internal
     147                 : #undef rgb_gray_convert_internal
     148                 : 
     149                 : #define RGB_RED EXT_XBGR_RED
     150                 : #define RGB_GREEN EXT_XBGR_GREEN
     151                 : #define RGB_BLUE EXT_XBGR_BLUE
     152                 : #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
     153                 : #define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
     154                 : #define rgb_gray_convert_internal extxbgr_gray_convert_internal
     155                 : #include "jccolext.c"
     156                 : #undef RGB_RED
     157                 : #undef RGB_GREEN
     158                 : #undef RGB_BLUE
     159                 : #undef RGB_PIXELSIZE
     160                 : #undef rgb_ycc_convert_internal
     161                 : #undef rgb_gray_convert_internal
     162                 : 
     163                 : #define RGB_RED EXT_XRGB_RED
     164                 : #define RGB_GREEN EXT_XRGB_GREEN
     165                 : #define RGB_BLUE EXT_XRGB_BLUE
     166                 : #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
     167                 : #define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
     168                 : #define rgb_gray_convert_internal extxrgb_gray_convert_internal
     169                 : #include "jccolext.c"
     170                 : #undef RGB_RED
     171                 : #undef RGB_GREEN
     172                 : #undef RGB_BLUE
     173                 : #undef RGB_PIXELSIZE
     174                 : #undef rgb_ycc_convert_internal
     175                 : #undef rgb_gray_convert_internal
     176                 : 
     177                 : 
     178                 : /*
     179                 :  * Initialize for RGB->YCC colorspace conversion.
     180                 :  */
     181                 : 
     182                 : METHODDEF(void)
     183               0 : rgb_ycc_start (j_compress_ptr cinfo)
     184                 : {
     185               0 :   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
     186                 :   INT32 * rgb_ycc_tab;
     187                 :   INT32 i;
     188                 : 
     189                 :   /* Allocate and fill in the conversion tables. */
     190               0 :   cconvert->rgb_ycc_tab = rgb_ycc_tab = (INT32 *)
     191               0 :     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
     192                 :                                 (TABLE_SIZE * SIZEOF(INT32)));
     193                 : 
     194               0 :   for (i = 0; i <= MAXJSAMPLE; i++) {
     195               0 :     rgb_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i;
     196               0 :     rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i;
     197               0 :     rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i     + ONE_HALF;
     198               0 :     rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i;
     199               0 :     rgb_ycc_tab[i+G_CB_OFF] = (-FIX(0.33126)) * i;
     200                 :     /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
     201                 :      * This ensures that the maximum output will round to MAXJSAMPLE
     202                 :      * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
     203                 :      */
     204               0 :     rgb_ycc_tab[i+B_CB_OFF] = FIX(0.50000) * i    + CBCR_OFFSET + ONE_HALF-1;
     205                 : /*  B=>Cb and R=>Cr tables are the same
     206                 :     rgb_ycc_tab[i+R_CR_OFF] = FIX(0.50000) * i    + CBCR_OFFSET + ONE_HALF-1;
     207                 : */
     208               0 :     rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i;
     209               0 :     rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i;
     210                 :   }
     211               0 : }
     212                 : 
     213                 : 
     214                 : /*
     215                 :  * Convert some rows of samples to the JPEG colorspace.
     216                 :  */
     217                 : 
     218                 : METHODDEF(void)
     219               0 : rgb_ycc_convert (j_compress_ptr cinfo,
     220                 :                  JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
     221                 :                  JDIMENSION output_row, int num_rows)
     222                 : {
     223               0 :   switch (cinfo->in_color_space) {
     224                 :     case JCS_EXT_RGB:
     225                 :       extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
     226                 :                                   num_rows);
     227               0 :       break;
     228                 :     case JCS_EXT_RGBX:
     229                 :     case JCS_EXT_RGBA:
     230                 :       extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
     231                 :                                    num_rows);
     232               0 :       break;
     233                 :     case JCS_EXT_BGR:
     234                 :       extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
     235                 :                                   num_rows);
     236               0 :       break;
     237                 :     case JCS_EXT_BGRX:
     238                 :     case JCS_EXT_BGRA:
     239                 :       extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
     240                 :                                    num_rows);
     241               0 :       break;
     242                 :     case JCS_EXT_XBGR:
     243                 :     case JCS_EXT_ABGR:
     244                 :       extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
     245                 :                                    num_rows);
     246               0 :       break;
     247                 :     case JCS_EXT_XRGB:
     248                 :     case JCS_EXT_ARGB:
     249                 :       extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
     250                 :                                    num_rows);
     251               0 :       break;
     252                 :     default:
     253                 :       rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
     254                 :                                num_rows);
     255               0 :       break;
     256                 :   }
     257               0 : }
     258                 : 
     259                 : 
     260                 : /**************** Cases other than RGB -> YCbCr **************/
     261                 : 
     262                 : 
     263                 : /*
     264                 :  * Convert some rows of samples to the JPEG colorspace.
     265                 :  */
     266                 : 
     267                 : METHODDEF(void)
     268               0 : rgb_gray_convert (j_compress_ptr cinfo,
     269                 :                   JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
     270                 :                   JDIMENSION output_row, int num_rows)
     271                 : {
     272               0 :   switch (cinfo->in_color_space) {
     273                 :     case JCS_EXT_RGB:
     274                 :       extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
     275                 :                                    num_rows);
     276               0 :       break;
     277                 :     case JCS_EXT_RGBX:
     278                 :     case JCS_EXT_RGBA:
     279                 :       extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
     280                 :                                     num_rows);
     281               0 :       break;
     282                 :     case JCS_EXT_BGR:
     283                 :       extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
     284                 :                                    num_rows);
     285               0 :       break;
     286                 :     case JCS_EXT_BGRX:
     287                 :     case JCS_EXT_BGRA:
     288                 :       extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
     289                 :                                     num_rows);
     290               0 :       break;
     291                 :     case JCS_EXT_XBGR:
     292                 :     case JCS_EXT_ABGR:
     293                 :       extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
     294                 :                                     num_rows);
     295               0 :       break;
     296                 :     case JCS_EXT_XRGB:
     297                 :     case JCS_EXT_ARGB:
     298                 :       extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
     299                 :                                     num_rows);
     300               0 :       break;
     301                 :     default:
     302                 :       rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
     303                 :                                 num_rows);
     304               0 :       break;
     305                 :   }
     306               0 : }
     307                 : 
     308                 : 
     309                 : /*
     310                 :  * Convert some rows of samples to the JPEG colorspace.
     311                 :  * This version handles Adobe-style CMYK->YCCK conversion,
     312                 :  * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
     313                 :  * conversion as above, while passing K (black) unchanged.
     314                 :  * We assume rgb_ycc_start has been called.
     315                 :  */
     316                 : 
     317                 : METHODDEF(void)
     318               0 : cmyk_ycck_convert (j_compress_ptr cinfo,
     319                 :                    JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
     320                 :                    JDIMENSION output_row, int num_rows)
     321                 : {
     322               0 :   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
     323                 :   register int r, g, b;
     324               0 :   register INT32 * ctab = cconvert->rgb_ycc_tab;
     325                 :   register JSAMPROW inptr;
     326                 :   register JSAMPROW outptr0, outptr1, outptr2, outptr3;
     327                 :   register JDIMENSION col;
     328               0 :   JDIMENSION num_cols = cinfo->image_width;
     329                 : 
     330               0 :   while (--num_rows >= 0) {
     331               0 :     inptr = *input_buf++;
     332               0 :     outptr0 = output_buf[0][output_row];
     333               0 :     outptr1 = output_buf[1][output_row];
     334               0 :     outptr2 = output_buf[2][output_row];
     335               0 :     outptr3 = output_buf[3][output_row];
     336               0 :     output_row++;
     337               0 :     for (col = 0; col < num_cols; col++) {
     338               0 :       r = MAXJSAMPLE - GETJSAMPLE(inptr[0]);
     339               0 :       g = MAXJSAMPLE - GETJSAMPLE(inptr[1]);
     340               0 :       b = MAXJSAMPLE - GETJSAMPLE(inptr[2]);
     341                 :       /* K passes through as-is */
     342               0 :       outptr3[col] = inptr[3];  /* don't need GETJSAMPLE here */
     343               0 :       inptr += 4;
     344                 :       /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
     345                 :        * must be too; we do not need an explicit range-limiting operation.
     346                 :        * Hence the value being shifted is never negative, and we don't
     347                 :        * need the general RIGHT_SHIFT macro.
     348                 :        */
     349                 :       /* Y */
     350               0 :       outptr0[col] = (JSAMPLE)
     351               0 :                 ((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
     352               0 :                  >> SCALEBITS);
     353                 :       /* Cb */
     354               0 :       outptr1[col] = (JSAMPLE)
     355               0 :                 ((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
     356               0 :                  >> SCALEBITS);
     357                 :       /* Cr */
     358               0 :       outptr2[col] = (JSAMPLE)
     359               0 :                 ((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
     360               0 :                  >> SCALEBITS);
     361                 :     }
     362                 :   }
     363               0 : }
     364                 : 
     365                 : 
     366                 : /*
     367                 :  * Convert some rows of samples to the JPEG colorspace.
     368                 :  * This version handles grayscale output with no conversion.
     369                 :  * The source can be either plain grayscale or YCbCr (since Y == gray).
     370                 :  */
     371                 : 
     372                 : METHODDEF(void)
     373               0 : grayscale_convert (j_compress_ptr cinfo,
     374                 :                    JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
     375                 :                    JDIMENSION output_row, int num_rows)
     376                 : {
     377                 :   register JSAMPROW inptr;
     378                 :   register JSAMPROW outptr;
     379                 :   register JDIMENSION col;
     380               0 :   JDIMENSION num_cols = cinfo->image_width;
     381               0 :   int instride = cinfo->input_components;
     382                 : 
     383               0 :   while (--num_rows >= 0) {
     384               0 :     inptr = *input_buf++;
     385               0 :     outptr = output_buf[0][output_row];
     386               0 :     output_row++;
     387               0 :     for (col = 0; col < num_cols; col++) {
     388               0 :       outptr[col] = inptr[0];   /* don't need GETJSAMPLE() here */
     389               0 :       inptr += instride;
     390                 :     }
     391                 :   }
     392               0 : }
     393                 : 
     394                 : 
     395                 : /*
     396                 :  * Convert some rows of samples to the JPEG colorspace.
     397                 :  * This version handles multi-component colorspaces without conversion.
     398                 :  * We assume input_components == num_components.
     399                 :  */
     400                 : 
     401                 : METHODDEF(void)
     402               0 : null_convert (j_compress_ptr cinfo,
     403                 :               JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
     404                 :               JDIMENSION output_row, int num_rows)
     405                 : {
     406                 :   register JSAMPROW inptr;
     407                 :   register JSAMPROW outptr;
     408                 :   register JDIMENSION col;
     409                 :   register int ci;
     410               0 :   int nc = cinfo->num_components;
     411               0 :   JDIMENSION num_cols = cinfo->image_width;
     412                 : 
     413               0 :   while (--num_rows >= 0) {
     414                 :     /* It seems fastest to make a separate pass for each component. */
     415               0 :     for (ci = 0; ci < nc; ci++) {
     416               0 :       inptr = *input_buf;
     417               0 :       outptr = output_buf[ci][output_row];
     418               0 :       for (col = 0; col < num_cols; col++) {
     419               0 :         outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */
     420               0 :         inptr += nc;
     421                 :       }
     422                 :     }
     423               0 :     input_buf++;
     424               0 :     output_row++;
     425                 :   }
     426               0 : }
     427                 : 
     428                 : 
     429                 : /*
     430                 :  * Empty method for start_pass.
     431                 :  */
     432                 : 
     433                 : METHODDEF(void)
     434               3 : null_method (j_compress_ptr cinfo)
     435                 : {
     436                 :   /* no work needed */
     437               3 : }
     438                 : 
     439                 : 
     440                 : /*
     441                 :  * Module initialization routine for input colorspace conversion.
     442                 :  */
     443                 : 
     444                 : GLOBAL(void)
     445               3 : jinit_color_converter (j_compress_ptr cinfo)
     446                 : {
     447                 :   my_cconvert_ptr cconvert;
     448                 : 
     449               3 :   cconvert = (my_cconvert_ptr)
     450               3 :     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
     451                 :                                 SIZEOF(my_color_converter));
     452               3 :   cinfo->cconvert = (struct jpeg_color_converter *) cconvert;
     453                 :   /* set start_pass to null method until we find out differently */
     454               3 :   cconvert->pub.start_pass = null_method;
     455                 : 
     456                 :   /* Make sure input_components agrees with in_color_space */
     457               3 :   switch (cinfo->in_color_space) {
     458                 :   case JCS_GRAYSCALE:
     459               0 :     if (cinfo->input_components != 1)
     460               0 :       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
     461               0 :     break;
     462                 : 
     463                 :   case JCS_RGB:
     464                 :   case JCS_EXT_RGB:
     465                 :   case JCS_EXT_RGBX:
     466                 :   case JCS_EXT_BGR:
     467                 :   case JCS_EXT_BGRX:
     468                 :   case JCS_EXT_XBGR:
     469                 :   case JCS_EXT_XRGB:
     470                 :   case JCS_EXT_RGBA:
     471                 :   case JCS_EXT_BGRA:
     472                 :   case JCS_EXT_ABGR:
     473                 :   case JCS_EXT_ARGB:
     474               3 :     if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
     475               0 :       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
     476               3 :     break;
     477                 : 
     478                 :   case JCS_YCbCr:
     479               0 :     if (cinfo->input_components != 3)
     480               0 :       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
     481               0 :     break;
     482                 : 
     483                 :   case JCS_CMYK:
     484                 :   case JCS_YCCK:
     485               0 :     if (cinfo->input_components != 4)
     486               0 :       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
     487               0 :     break;
     488                 : 
     489                 :   default:                      /* JCS_UNKNOWN can be anything */
     490               0 :     if (cinfo->input_components < 1)
     491               0 :       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
     492               0 :     break;
     493                 :   }
     494                 : 
     495                 :   /* Check num_components, set conversion method based on requested space */
     496               3 :   switch (cinfo->jpeg_color_space) {
     497                 :   case JCS_GRAYSCALE:
     498               0 :     if (cinfo->num_components != 1)
     499               0 :       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     500               0 :     if (cinfo->in_color_space == JCS_GRAYSCALE)
     501               0 :       cconvert->pub.color_convert = grayscale_convert;
     502               0 :     else if (cinfo->in_color_space == JCS_RGB ||
     503               0 :              cinfo->in_color_space == JCS_EXT_RGB ||
     504               0 :              cinfo->in_color_space == JCS_EXT_RGBX ||
     505               0 :              cinfo->in_color_space == JCS_EXT_BGR ||
     506               0 :              cinfo->in_color_space == JCS_EXT_BGRX ||
     507               0 :              cinfo->in_color_space == JCS_EXT_XBGR ||
     508               0 :              cinfo->in_color_space == JCS_EXT_XRGB ||
     509               0 :              cinfo->in_color_space == JCS_EXT_RGBA ||
     510               0 :              cinfo->in_color_space == JCS_EXT_BGRA ||
     511               0 :              cinfo->in_color_space == JCS_EXT_ABGR ||
     512               0 :              cinfo->in_color_space == JCS_EXT_ARGB) {
     513               0 :       if (jsimd_can_rgb_gray())
     514               0 :         cconvert->pub.color_convert = jsimd_rgb_gray_convert;
     515                 :       else {
     516               0 :         cconvert->pub.start_pass = rgb_ycc_start;
     517               0 :         cconvert->pub.color_convert = rgb_gray_convert;
     518                 :       }
     519               0 :     } else if (cinfo->in_color_space == JCS_YCbCr)
     520               0 :       cconvert->pub.color_convert = grayscale_convert;
     521                 :     else
     522               0 :       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     523               0 :     break;
     524                 : 
     525                 :   case JCS_RGB:
     526                 :   case JCS_EXT_RGB:
     527                 :   case JCS_EXT_RGBX:
     528                 :   case JCS_EXT_BGR:
     529                 :   case JCS_EXT_BGRX:
     530                 :   case JCS_EXT_XBGR:
     531                 :   case JCS_EXT_XRGB:
     532                 :   case JCS_EXT_RGBA:
     533                 :   case JCS_EXT_BGRA:
     534                 :   case JCS_EXT_ABGR:
     535                 :   case JCS_EXT_ARGB:
     536               0 :     if (cinfo->num_components != 3)
     537               0 :       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     538               0 :     if (cinfo->in_color_space == cinfo->jpeg_color_space &&
     539               0 :       rgb_pixelsize[cinfo->in_color_space] == 3)
     540               0 :       cconvert->pub.color_convert = null_convert;
     541                 :     else
     542               0 :       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     543               0 :     break;
     544                 : 
     545                 :   case JCS_YCbCr:
     546               3 :     if (cinfo->num_components != 3)
     547               0 :       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     548               3 :     if (cinfo->in_color_space == JCS_RGB ||
     549               0 :         cinfo->in_color_space == JCS_EXT_RGB ||
     550               0 :         cinfo->in_color_space == JCS_EXT_RGBX ||
     551               0 :         cinfo->in_color_space == JCS_EXT_BGR ||
     552               0 :         cinfo->in_color_space == JCS_EXT_BGRX ||
     553               0 :         cinfo->in_color_space == JCS_EXT_XBGR ||
     554               0 :         cinfo->in_color_space == JCS_EXT_XRGB ||
     555               0 :         cinfo->in_color_space == JCS_EXT_RGBA ||
     556               0 :         cinfo->in_color_space == JCS_EXT_BGRA ||
     557               0 :         cinfo->in_color_space == JCS_EXT_ABGR ||
     558               0 :         cinfo->in_color_space == JCS_EXT_ARGB) {
     559               6 :       if (jsimd_can_rgb_ycc())
     560               3 :         cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
     561                 :       else {
     562               0 :         cconvert->pub.start_pass = rgb_ycc_start;
     563               0 :         cconvert->pub.color_convert = rgb_ycc_convert;
     564                 :       }
     565               0 :     } else if (cinfo->in_color_space == JCS_YCbCr)
     566               0 :       cconvert->pub.color_convert = null_convert;
     567                 :     else
     568               0 :       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     569               3 :     break;
     570                 : 
     571                 :   case JCS_CMYK:
     572               0 :     if (cinfo->num_components != 4)
     573               0 :       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     574               0 :     if (cinfo->in_color_space == JCS_CMYK)
     575               0 :       cconvert->pub.color_convert = null_convert;
     576                 :     else
     577               0 :       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     578               0 :     break;
     579                 : 
     580                 :   case JCS_YCCK:
     581               0 :     if (cinfo->num_components != 4)
     582               0 :       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     583               0 :     if (cinfo->in_color_space == JCS_CMYK) {
     584               0 :       cconvert->pub.start_pass = rgb_ycc_start;
     585               0 :       cconvert->pub.color_convert = cmyk_ycck_convert;
     586               0 :     } else if (cinfo->in_color_space == JCS_YCCK)
     587               0 :       cconvert->pub.color_convert = null_convert;
     588                 :     else
     589               0 :       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     590               0 :     break;
     591                 : 
     592                 :   default:                      /* allow null conversion of JCS_UNKNOWN */
     593               0 :     if (cinfo->jpeg_color_space != cinfo->in_color_space ||
     594               0 :         cinfo->num_components != cinfo->input_components)
     595               0 :       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     596               0 :     cconvert->pub.color_convert = null_convert;
     597               0 :     break;
     598                 :   }
     599               3 : }

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