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