The Tor Browser: media/libjpeg/jdcolor.c@6474c204b198 (annotated)

media/libjpeg/jdcolor.c@6474c204b198 (annotated)

media/libjpeg/jdcolor.c

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /*
  * jdcolor.c
  *
  * This file was part of the Independent JPEG Group's software:
  * Copyright (C) 1991-1997, Thomas G. Lane.
  * Modified 2011 by Guido Vollbeding.
  * libjpeg-turbo Modifications:
  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
  * Copyright (C) 2009, 2011-2012, D. R. Commander.
  * For conditions of distribution and use, see the accompanying README file.
  *
  * This file contains output colorspace conversion routines.
  */
 #define JPEG_INTERNALS
 #include "jinclude.h"
 #include "jpeglib.h"
 #include "jsimd.h"
 #include "config.h"
 /* Private subobject */
 typedef struct {
   struct jpeg_color_deconverter pub; /* public fields */
   /* Private state for YCC->RGB conversion */
   int * Cr_r_tab;		/* => table for Cr to R conversion */
   int * Cb_b_tab;		/* => table for Cb to B conversion */
   INT32 * Cr_g_tab;		/* => table for Cr to G conversion */
   INT32 * Cb_g_tab;		/* => table for Cb to G conversion */
   /* Private state for RGB->Y conversion */
   INT32 * rgb_y_tab;		/* => table for RGB to Y conversion */
 } my_color_deconverter;
 typedef my_color_deconverter * my_cconvert_ptr;
 /**************** YCbCr -> RGB conversion: most common case **************/
 /****************   RGB -> Y   conversion: less common case **************/
 /*
  * YCbCr is defined per CCIR 601-1, except that Cb and Cr are
  * normalized to the range 0..MAXJSAMPLE rather than -0.5 .. 0.5.
  * The conversion equations to be implemented are therefore
  *
  *	R = Y                + 1.40200 * Cr
  *	G = Y - 0.34414 * Cb - 0.71414 * Cr
  *	B = Y + 1.77200 * Cb
  *
  *	Y = 0.29900 * R + 0.58700 * G + 0.11400 * B
  *
  * where Cb and Cr represent the incoming values less CENTERJSAMPLE.
  * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
  *
  * To avoid floating-point arithmetic, we represent the fractional constants
  * as integers scaled up by 2^16 (about 4 digits precision); we have to divide
  * the products by 2^16, with appropriate rounding, to get the correct answer.
  * Notice that Y, being an integral input, does not contribute any fraction
  * so it need not participate in the rounding.
  *
  * For even more speed, we avoid doing any multiplications in the inner loop
  * by precalculating the constants times Cb and Cr for all possible values.
  * For 8-bit JSAMPLEs this is very reasonable (only 256 entries per table);
  * for 12-bit samples it is still acceptable.  It's not very reasonable for
  * 16-bit samples, but if you want lossless storage you shouldn't be changing
  * colorspace anyway.
  * The Cr=>R and Cb=>B values can be rounded to integers in advance; the
  * values for the G calculation are left scaled up, since we must add them
  * together before rounding.
  */
 #define SCALEBITS	16	/* speediest right-shift on some machines */
 #define ONE_HALF	((INT32) 1 << (SCALEBITS-1))
 #define FIX(x)		((INT32) ((x) * (1L<<SCALEBITS) + 0.5))
 /* We allocate one big table for RGB->Y conversion and divide it up into
  * three parts, instead of doing three alloc_small requests.  This lets us
  * use a single table base address, which can be held in a register in the
  * inner loops on many machines (more than can hold all three addresses,
  * anyway).
  */
 #define R_Y_OFF		0			/* offset to R => Y section */
 #define G_Y_OFF		(1*(MAXJSAMPLE+1))	/* offset to G => Y section */
 #define B_Y_OFF		(2*(MAXJSAMPLE+1))	/* etc. */
 #define TABLE_SIZE	(3*(MAXJSAMPLE+1))
 /* Include inline routines for colorspace extensions */
 #include "jdcolext.c"
 #undef RGB_RED
 #undef RGB_GREEN
 #undef RGB_BLUE
 #undef RGB_PIXELSIZE
 #define RGB_RED EXT_RGB_RED
 #define RGB_GREEN EXT_RGB_GREEN
 #define RGB_BLUE EXT_RGB_BLUE
 #define RGB_PIXELSIZE EXT_RGB_PIXELSIZE
 #define ycc_rgb_convert_internal ycc_extrgb_convert_internal
 #define gray_rgb_convert_internal gray_extrgb_convert_internal
 #define rgb_rgb_convert_internal rgb_extrgb_convert_internal
 #include "jdcolext.c"
 #undef RGB_RED
 #undef RGB_GREEN
 #undef RGB_BLUE
 #undef RGB_PIXELSIZE
 #undef ycc_rgb_convert_internal
 #undef gray_rgb_convert_internal
 #undef rgb_rgb_convert_internal
 #define RGB_RED EXT_RGBX_RED
 #define RGB_GREEN EXT_RGBX_GREEN
 #define RGB_BLUE EXT_RGBX_BLUE
 #define RGB_ALPHA 3
 #define RGB_PIXELSIZE EXT_RGBX_PIXELSIZE
 #define ycc_rgb_convert_internal ycc_extrgbx_convert_internal
 #define gray_rgb_convert_internal gray_extrgbx_convert_internal
 #define rgb_rgb_convert_internal rgb_extrgbx_convert_internal
 #include "jdcolext.c"
 #undef RGB_RED
 #undef RGB_GREEN
 #undef RGB_BLUE
 #undef RGB_ALPHA
 #undef RGB_PIXELSIZE
 #undef ycc_rgb_convert_internal
 #undef gray_rgb_convert_internal
 #undef rgb_rgb_convert_internal
 #define RGB_RED EXT_BGR_RED
 #define RGB_GREEN EXT_BGR_GREEN
 #define RGB_BLUE EXT_BGR_BLUE
 #define RGB_PIXELSIZE EXT_BGR_PIXELSIZE
 #define ycc_rgb_convert_internal ycc_extbgr_convert_internal
 #define gray_rgb_convert_internal gray_extbgr_convert_internal
 #define rgb_rgb_convert_internal rgb_extbgr_convert_internal
 #include "jdcolext.c"
 #undef RGB_RED
 #undef RGB_GREEN
 #undef RGB_BLUE
 #undef RGB_PIXELSIZE
 #undef ycc_rgb_convert_internal
 #undef gray_rgb_convert_internal
 #undef rgb_rgb_convert_internal
 #define RGB_RED EXT_BGRX_RED
 #define RGB_GREEN EXT_BGRX_GREEN
 #define RGB_BLUE EXT_BGRX_BLUE
 #define RGB_ALPHA 3
 #define RGB_PIXELSIZE EXT_BGRX_PIXELSIZE
 #define ycc_rgb_convert_internal ycc_extbgrx_convert_internal
 #define gray_rgb_convert_internal gray_extbgrx_convert_internal
 #define rgb_rgb_convert_internal rgb_extbgrx_convert_internal
 #include "jdcolext.c"
 #undef RGB_RED
 #undef RGB_GREEN
 #undef RGB_BLUE
 #undef RGB_ALPHA
 #undef RGB_PIXELSIZE
 #undef ycc_rgb_convert_internal
 #undef gray_rgb_convert_internal
 #undef rgb_rgb_convert_internal
 #define RGB_RED EXT_XBGR_RED
 #define RGB_GREEN EXT_XBGR_GREEN
 #define RGB_BLUE EXT_XBGR_BLUE
 #define RGB_ALPHA 0
 #define RGB_PIXELSIZE EXT_XBGR_PIXELSIZE
 #define ycc_rgb_convert_internal ycc_extxbgr_convert_internal
 #define gray_rgb_convert_internal gray_extxbgr_convert_internal
 #define rgb_rgb_convert_internal rgb_extxbgr_convert_internal
 #include "jdcolext.c"
 #undef RGB_RED
 #undef RGB_GREEN
 #undef RGB_BLUE
 #undef RGB_ALPHA
 #undef RGB_PIXELSIZE
 #undef ycc_rgb_convert_internal
 #undef gray_rgb_convert_internal
 #undef rgb_rgb_convert_internal
 #define RGB_RED EXT_XRGB_RED
 #define RGB_GREEN EXT_XRGB_GREEN
 #define RGB_BLUE EXT_XRGB_BLUE
 #define RGB_ALPHA 0
 #define RGB_PIXELSIZE EXT_XRGB_PIXELSIZE
 #define ycc_rgb_convert_internal ycc_extxrgb_convert_internal
 #define gray_rgb_convert_internal gray_extxrgb_convert_internal
 #define rgb_rgb_convert_internal rgb_extxrgb_convert_internal
 #include "jdcolext.c"
 #undef RGB_RED
 #undef RGB_GREEN
 #undef RGB_BLUE
 #undef RGB_ALPHA
 #undef RGB_PIXELSIZE
 #undef ycc_rgb_convert_internal
 #undef gray_rgb_convert_internal
 #undef rgb_rgb_convert_internal
 /*
  * Initialize tables for YCC->RGB colorspace conversion.
  */
 LOCAL(void)
 build_ycc_rgb_table (j_decompress_ptr cinfo)
 {
   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
   int i;
   INT32 x;
   SHIFT_TEMPS
   cconvert->Cr_r_tab = (int *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 				(MAXJSAMPLE+1) * SIZEOF(int));
   cconvert->Cb_b_tab = (int *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 				(MAXJSAMPLE+1) * SIZEOF(int));
   cconvert->Cr_g_tab = (INT32 *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 				(MAXJSAMPLE+1) * SIZEOF(INT32));
   cconvert->Cb_g_tab = (INT32 *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 				(MAXJSAMPLE+1) * SIZEOF(INT32));
   for (i = 0, x = -CENTERJSAMPLE; i <= MAXJSAMPLE; i++, x++) {
     /* i is the actual input pixel value, in the range 0..MAXJSAMPLE */
     /* The Cb or Cr value we are thinking of is x = i - CENTERJSAMPLE */
     /* Cr=>R value is nearest int to 1.40200 * x */
     cconvert->Cr_r_tab[i] = (int)
 		    RIGHT_SHIFT(FIX(1.40200) * x + ONE_HALF, SCALEBITS);
     /* Cb=>B value is nearest int to 1.77200 * x */
     cconvert->Cb_b_tab[i] = (int)
 		    RIGHT_SHIFT(FIX(1.77200) * x + ONE_HALF, SCALEBITS);
     /* Cr=>G value is scaled-up -0.71414 * x */
     cconvert->Cr_g_tab[i] = (- FIX(0.71414)) * x;
     /* Cb=>G value is scaled-up -0.34414 * x */
     /* We also add in ONE_HALF so that need not do it in inner loop */
     cconvert->Cb_g_tab[i] = (- FIX(0.34414)) * x + ONE_HALF;
   }
 }
 /*
  * Convert some rows of samples to the output colorspace.
  */
 METHODDEF(void)
 ycc_rgb_convert (j_decompress_ptr cinfo,
 		 JSAMPIMAGE input_buf, JDIMENSION input_row,
 		 JSAMPARRAY output_buf, int num_rows)
 {
   switch (cinfo->out_color_space) {
     case JCS_EXT_RGB:
       ycc_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                   num_rows);
       break;
     case JCS_EXT_RGBX:
     case JCS_EXT_RGBA:
       ycc_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_BGR:
       ycc_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
                                   num_rows);
       break;
     case JCS_EXT_BGRX:
     case JCS_EXT_BGRA:
       ycc_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_XBGR:
     case JCS_EXT_ABGR:
       ycc_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_XRGB:
     case JCS_EXT_ARGB:
       ycc_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     default:
       ycc_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                num_rows);
       break;
   }
 }
 /**************** Cases other than YCbCr -> RGB **************/
 /*
  * Initialize for RGB->grayscale colorspace conversion.
  */
 LOCAL(void)
 build_rgb_y_table (j_decompress_ptr cinfo)
 {
   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
   INT32 * rgb_y_tab;
   INT32 i;
   /* Allocate and fill in the conversion tables. */
   cconvert->rgb_y_tab = rgb_y_tab = (INT32 *)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 				(TABLE_SIZE * SIZEOF(INT32)));
   for (i = 0; i <= MAXJSAMPLE; i++) {
     rgb_y_tab[i+R_Y_OFF] = FIX(0.29900) * i;
     rgb_y_tab[i+G_Y_OFF] = FIX(0.58700) * i;
     rgb_y_tab[i+B_Y_OFF] = FIX(0.11400) * i + ONE_HALF;
   }
 }
 /*
  * Convert RGB to grayscale.
  */
 METHODDEF(void)
 rgb_gray_convert (j_decompress_ptr cinfo,
 		  JSAMPIMAGE input_buf, JDIMENSION input_row,
 		  JSAMPARRAY output_buf, int num_rows)
 {
   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
   register int r, g, b;
   register INT32 * ctab = cconvert->rgb_y_tab;
   register JSAMPROW outptr;
   register JSAMPROW inptr0, inptr1, inptr2;
   register JDIMENSION col;
   JDIMENSION num_cols = cinfo->output_width;
   while (--num_rows >= 0) {
     inptr0 = input_buf[0][input_row];
     inptr1 = input_buf[1][input_row];
     inptr2 = input_buf[2][input_row];
     input_row++;
     outptr = *output_buf++;
     for (col = 0; col < num_cols; col++) {
       r = GETJSAMPLE(inptr0[col]);
       g = GETJSAMPLE(inptr1[col]);
       b = GETJSAMPLE(inptr2[col]);
       /* Y */
       outptr[col] = (JSAMPLE)
 		((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
 		 >> SCALEBITS);
     }
   }
 }
 /*
  * Color conversion for no colorspace change: just copy the data,
  * converting from separate-planes to interleaved representation.
  */
 METHODDEF(void)
 null_convert (j_decompress_ptr cinfo,
 	      JSAMPIMAGE input_buf, JDIMENSION input_row,
 	      JSAMPARRAY output_buf, int num_rows)
 {
   register JSAMPROW inptr, outptr;
   register JDIMENSION count;
   register int num_components = cinfo->num_components;
   JDIMENSION num_cols = cinfo->output_width;
   int ci;
   while (--num_rows >= 0) {
     for (ci = 0; ci < num_components; ci++) {
       inptr = input_buf[ci][input_row];
       outptr = output_buf[0] + ci;
       for (count = num_cols; count > 0; count--) {
 	*outptr = *inptr++;	/* needn't bother with GETJSAMPLE() here */
 	outptr += num_components;
       }
     }
     input_row++;
     output_buf++;
   }
 }
 /*
  * Color conversion for grayscale: just copy the data.
  * This also works for YCbCr -> grayscale conversion, in which
  * we just copy the Y (luminance) component and ignore chrominance.
  */
 METHODDEF(void)
 grayscale_convert (j_decompress_ptr cinfo,
 		   JSAMPIMAGE input_buf, JDIMENSION input_row,
 		   JSAMPARRAY output_buf, int num_rows)
 {
   jcopy_sample_rows(input_buf[0], (int) input_row, output_buf, 0,
 		    num_rows, cinfo->output_width);
 }
 /*
  * Convert grayscale to RGB
  */
 METHODDEF(void)
 gray_rgb_convert (j_decompress_ptr cinfo,
 		  JSAMPIMAGE input_buf, JDIMENSION input_row,
 		  JSAMPARRAY output_buf, int num_rows)
 {
   switch (cinfo->out_color_space) {
     case JCS_EXT_RGB:
       gray_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_RGBX:
     case JCS_EXT_RGBA:
       gray_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
                                     num_rows);
       break;
     case JCS_EXT_BGR:
       gray_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_BGRX:
     case JCS_EXT_BGRA:
       gray_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
                                     num_rows);
       break;
     case JCS_EXT_XBGR:
     case JCS_EXT_ABGR:
       gray_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
                                     num_rows);
       break;
     case JCS_EXT_XRGB:
     case JCS_EXT_ARGB:
       gray_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                     num_rows);
       break;
     default:
       gray_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                 num_rows);
       break;
   }
 }
 /*
  * Convert plain RGB to extended RGB
  */
 METHODDEF(void)
 rgb_rgb_convert (j_decompress_ptr cinfo,
 		  JSAMPIMAGE input_buf, JDIMENSION input_row,
 		  JSAMPARRAY output_buf, int num_rows)
 {
   switch (cinfo->out_color_space) {
     case JCS_EXT_RGB:
       rgb_extrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                   num_rows);
       break;
     case JCS_EXT_RGBX:
     case JCS_EXT_RGBA:
       rgb_extrgbx_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_BGR:
       rgb_extbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
                                   num_rows);
       break;
     case JCS_EXT_BGRX:
     case JCS_EXT_BGRA:
       rgb_extbgrx_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_XBGR:
     case JCS_EXT_ABGR:
       rgb_extxbgr_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     case JCS_EXT_XRGB:
     case JCS_EXT_ARGB:
       rgb_extxrgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                    num_rows);
       break;
     default:
       rgb_rgb_convert_internal(cinfo, input_buf, input_row, output_buf,
                                num_rows);
       break;
   }
 }
 /*
  * Adobe-style YCCK->CMYK conversion.
  * We convert YCbCr to R=1-C, G=1-M, and B=1-Y using the same
  * conversion as above, while passing K (black) unchanged.
  * We assume build_ycc_rgb_table has been called.
  */
 METHODDEF(void)
 ycck_cmyk_convert (j_decompress_ptr cinfo,
 		   JSAMPIMAGE input_buf, JDIMENSION input_row,
 		   JSAMPARRAY output_buf, int num_rows)
 {
   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
   register int y, cb, cr;
   register JSAMPROW outptr;
   register JSAMPROW inptr0, inptr1, inptr2, inptr3;
   register JDIMENSION col;
   JDIMENSION num_cols = cinfo->output_width;
   /* copy these pointers into registers if possible */
   register JSAMPLE * range_limit = cinfo->sample_range_limit;
   register int * Crrtab = cconvert->Cr_r_tab;
   register int * Cbbtab = cconvert->Cb_b_tab;
   register INT32 * Crgtab = cconvert->Cr_g_tab;
   register INT32 * Cbgtab = cconvert->Cb_g_tab;
   SHIFT_TEMPS
   while (--num_rows >= 0) {
     inptr0 = input_buf[0][input_row];
     inptr1 = input_buf[1][input_row];
     inptr2 = input_buf[2][input_row];
     inptr3 = input_buf[3][input_row];
     input_row++;
     outptr = *output_buf++;
     for (col = 0; col < num_cols; col++) {
       y  = GETJSAMPLE(inptr0[col]);
       cb = GETJSAMPLE(inptr1[col]);
       cr = GETJSAMPLE(inptr2[col]);
       /* Range-limiting is essential due to noise introduced by DCT losses. */
       outptr[0] = range_limit[MAXJSAMPLE - (y + Crrtab[cr])];	/* red */
       outptr[1] = range_limit[MAXJSAMPLE - (y +			/* green */
 			      ((int) RIGHT_SHIFT(Cbgtab[cb] + Crgtab[cr],
 						 SCALEBITS)))];
       outptr[2] = range_limit[MAXJSAMPLE - (y + Cbbtab[cb])];	/* blue */
       /* K passes through unchanged */
       outptr[3] = inptr3[col];	/* don't need GETJSAMPLE here */
       outptr += 4;
     }
   }
 }
 /*
  * Empty method for start_pass.
  */
 METHODDEF(void)
 start_pass_dcolor (j_decompress_ptr cinfo)
 {
   /* no work needed */
 }
 /*
  * Module initialization routine for output colorspace conversion.
  */
 GLOBAL(void)
 jinit_color_deconverter (j_decompress_ptr cinfo)
 {
   my_cconvert_ptr cconvert;
   int ci;
   cconvert = (my_cconvert_ptr)
     (*cinfo->mem->alloc_small) ((j_common_ptr) cinfo, JPOOL_IMAGE,
 				SIZEOF(my_color_deconverter));
   cinfo->cconvert = (struct jpeg_color_deconverter *) cconvert;
   cconvert->pub.start_pass = start_pass_dcolor;
   /* Make sure num_components agrees with jpeg_color_space */
   switch (cinfo->jpeg_color_space) {
   case JCS_GRAYSCALE:
     if (cinfo->num_components != 1)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
   case JCS_RGB:
   case JCS_YCbCr:
     if (cinfo->num_components != 3)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
   case JCS_CMYK:
   case JCS_YCCK:
     if (cinfo->num_components != 4)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
   default:			/* JCS_UNKNOWN can be anything */
     if (cinfo->num_components < 1)
       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
     break;
   }
   /* Set out_color_components and conversion method based on requested space.
    * Also clear the component_needed flags for any unused components,
    * so that earlier pipeline stages can avoid useless computation.
    */
   switch (cinfo->out_color_space) {
   case JCS_GRAYSCALE:
     cinfo->out_color_components = 1;
     if (cinfo->jpeg_color_space == JCS_GRAYSCALE ||
 	cinfo->jpeg_color_space == JCS_YCbCr) {
       cconvert->pub.color_convert = grayscale_convert;
       /* For color->grayscale conversion, only the Y (0) component is needed */
       for (ci = 1; ci < cinfo->num_components; ci++)
 	cinfo->comp_info[ci].component_needed = FALSE;
     } else if (cinfo->jpeg_color_space == JCS_RGB) {
       cconvert->pub.color_convert = rgb_gray_convert;
       build_rgb_y_table(cinfo);
     } else
       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     break;
   case JCS_RGB:
   case JCS_EXT_RGB:
   case JCS_EXT_RGBX:
   case JCS_EXT_BGR:
   case JCS_EXT_BGRX:
   case JCS_EXT_XBGR:
   case JCS_EXT_XRGB:
   case JCS_EXT_RGBA:
   case JCS_EXT_BGRA:
   case JCS_EXT_ABGR:
   case JCS_EXT_ARGB:
     cinfo->out_color_components = rgb_pixelsize[cinfo->out_color_space];
     if (cinfo->jpeg_color_space == JCS_YCbCr) {
       if (jsimd_can_ycc_rgb())
         cconvert->pub.color_convert = jsimd_ycc_rgb_convert;
       else {
         cconvert->pub.color_convert = ycc_rgb_convert;
         build_ycc_rgb_table(cinfo);
       }
     } else if (cinfo->jpeg_color_space == JCS_GRAYSCALE) {
       cconvert->pub.color_convert = gray_rgb_convert;
     } else if (cinfo->jpeg_color_space == JCS_RGB) {
       if (rgb_red[cinfo->out_color_space] == 0 &&
           rgb_green[cinfo->out_color_space] == 1 &&
           rgb_blue[cinfo->out_color_space] == 2 &&
           rgb_pixelsize[cinfo->out_color_space] == 3)
         cconvert->pub.color_convert = null_convert;
       else
         cconvert->pub.color_convert = rgb_rgb_convert;
     } else
       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     break;
   case JCS_CMYK:
     cinfo->out_color_components = 4;
     if (cinfo->jpeg_color_space == JCS_YCCK) {
       cconvert->pub.color_convert = ycck_cmyk_convert;
       build_ycc_rgb_table(cinfo);
     } else if (cinfo->jpeg_color_space == JCS_CMYK) {
       cconvert->pub.color_convert = null_convert;
     } else
       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     break;
   default:
     /* Permit null conversion to same output space */
     if (cinfo->out_color_space == cinfo->jpeg_color_space) {
       cinfo->out_color_components = cinfo->num_components;
       cconvert->pub.color_convert = null_convert;
     } else			/* unsupported non-null conversion */
       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
     break;
   }
   if (cinfo->quantize_colors)
     cinfo->output_components = 1; /* single colormapped output component */
   else
     cinfo->output_components = cinfo->out_color_components;
 }

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media/libjpeg/jdcolor.c@6474c204b198 (annotated)

media/libjpeg/jdcolor.c