michael@0: /*
michael@0:  * jccolor.c
michael@0:  *
michael@0:  * This file was part of the Independent JPEG Group's software:
michael@0:  * Copyright (C) 1991-1996, Thomas G. Lane.
michael@0:  * libjpeg-turbo Modifications:
michael@0:  * Copyright 2009 Pierre Ossman <ossman@cendio.se> for Cendio AB
michael@0:  * Copyright (C) 2009-2012, D. R. Commander.
michael@0:  * For conditions of distribution and use, see the accompanying README file.
michael@0:  *
michael@0:  * This file contains input 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_converter pub; /* public fields */
michael@0: 
michael@0:   /* Private state for RGB->YCC conversion */
michael@0:   INT32 * rgb_ycc_tab;		/* => table for RGB to YCbCr conversion */
michael@0: } my_color_converter;
michael@0: 
michael@0: typedef my_color_converter * my_cconvert_ptr;
michael@0: 
michael@0: 
michael@0: /**************** RGB -> YCbCr conversion: most 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:  *	Y  =  0.29900 * R + 0.58700 * G + 0.11400 * B
michael@0:  *	Cb = -0.16874 * R - 0.33126 * G + 0.50000 * B  + CENTERJSAMPLE
michael@0:  *	Cr =  0.50000 * R - 0.41869 * G - 0.08131 * B  + CENTERJSAMPLE
michael@0:  * (These numbers are derived from TIFF 6.0 section 21, dated 3-June-92.)
michael@0:  * Note: older versions of the IJG code used a zero offset of MAXJSAMPLE/2,
michael@0:  * rather than CENTERJSAMPLE, for Cb and Cr.  This gave equal positive and
michael@0:  * negative swings for Cb/Cr, but meant that grayscale values (Cb=Cr=0)
michael@0:  * were not represented exactly.  Now we sacrifice exact representation of
michael@0:  * maximum red and maximum blue in order to get exact grayscales.
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:  *
michael@0:  * For even more speed, we avoid doing any multiplications in the inner loop
michael@0:  * by precalculating the constants times R,G,B 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 CENTERJSAMPLE offsets and the rounding fudge-factor of 0.5 are included
michael@0:  * in the tables to save adding them separately in the inner loop.
michael@0:  */
michael@0: 
michael@0: #define SCALEBITS	16	/* speediest right-shift on some machines */
michael@0: #define CBCR_OFFSET	((INT32) CENTERJSAMPLE << SCALEBITS)
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 and divide it up into eight parts, instead of
michael@0:  * doing eight alloc_small requests.  This lets us use a single table base
michael@0:  * address, which can be held in a register in the inner loops on many
michael@0:  * machines (more than can hold all eight addresses, 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 R_CB_OFF	(3*(MAXJSAMPLE+1))
michael@0: #define G_CB_OFF	(4*(MAXJSAMPLE+1))
michael@0: #define B_CB_OFF	(5*(MAXJSAMPLE+1))
michael@0: #define R_CR_OFF	B_CB_OFF		/* B=>Cb, R=>Cr are the same */
michael@0: #define G_CR_OFF	(6*(MAXJSAMPLE+1))
michael@0: #define B_CR_OFF	(7*(MAXJSAMPLE+1))
michael@0: #define TABLE_SIZE	(8*(MAXJSAMPLE+1))
michael@0: 
michael@0: 
michael@0: /* Include inline routines for colorspace extensions */
michael@0: 
michael@0: #include "jccolext.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 rgb_ycc_convert_internal extrgb_ycc_convert_internal
michael@0: #define rgb_gray_convert_internal extrgb_gray_convert_internal
michael@0: #define rgb_rgb_convert_internal extrgb_rgb_convert_internal
michael@0: #include "jccolext.c"
michael@0: #undef RGB_RED
michael@0: #undef RGB_GREEN
michael@0: #undef RGB_BLUE
michael@0: #undef RGB_PIXELSIZE
michael@0: #undef rgb_ycc_convert_internal
michael@0: #undef rgb_gray_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_PIXELSIZE EXT_RGBX_PIXELSIZE
michael@0: #define rgb_ycc_convert_internal extrgbx_ycc_convert_internal
michael@0: #define rgb_gray_convert_internal extrgbx_gray_convert_internal
michael@0: #define rgb_rgb_convert_internal extrgbx_rgb_convert_internal
michael@0: #include "jccolext.c"
michael@0: #undef RGB_RED
michael@0: #undef RGB_GREEN
michael@0: #undef RGB_BLUE
michael@0: #undef RGB_PIXELSIZE
michael@0: #undef rgb_ycc_convert_internal
michael@0: #undef rgb_gray_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 rgb_ycc_convert_internal extbgr_ycc_convert_internal
michael@0: #define rgb_gray_convert_internal extbgr_gray_convert_internal
michael@0: #define rgb_rgb_convert_internal extbgr_rgb_convert_internal
michael@0: #include "jccolext.c"
michael@0: #undef RGB_RED
michael@0: #undef RGB_GREEN
michael@0: #undef RGB_BLUE
michael@0: #undef RGB_PIXELSIZE
michael@0: #undef rgb_ycc_convert_internal
michael@0: #undef rgb_gray_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_PIXELSIZE EXT_BGRX_PIXELSIZE
michael@0: #define rgb_ycc_convert_internal extbgrx_ycc_convert_internal
michael@0: #define rgb_gray_convert_internal extbgrx_gray_convert_internal
michael@0: #define rgb_rgb_convert_internal extbgrx_rgb_convert_internal
michael@0: #include "jccolext.c"
michael@0: #undef RGB_RED
michael@0: #undef RGB_GREEN
michael@0: #undef RGB_BLUE
michael@0: #undef RGB_PIXELSIZE
michael@0: #undef rgb_ycc_convert_internal
michael@0: #undef rgb_gray_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_PIXELSIZE EXT_XBGR_PIXELSIZE
michael@0: #define rgb_ycc_convert_internal extxbgr_ycc_convert_internal
michael@0: #define rgb_gray_convert_internal extxbgr_gray_convert_internal
michael@0: #define rgb_rgb_convert_internal extxbgr_rgb_convert_internal
michael@0: #include "jccolext.c"
michael@0: #undef RGB_RED
michael@0: #undef RGB_GREEN
michael@0: #undef RGB_BLUE
michael@0: #undef RGB_PIXELSIZE
michael@0: #undef rgb_ycc_convert_internal
michael@0: #undef rgb_gray_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_PIXELSIZE EXT_XRGB_PIXELSIZE
michael@0: #define rgb_ycc_convert_internal extxrgb_ycc_convert_internal
michael@0: #define rgb_gray_convert_internal extxrgb_gray_convert_internal
michael@0: #define rgb_rgb_convert_internal extxrgb_rgb_convert_internal
michael@0: #include "jccolext.c"
michael@0: #undef RGB_RED
michael@0: #undef RGB_GREEN
michael@0: #undef RGB_BLUE
michael@0: #undef RGB_PIXELSIZE
michael@0: #undef rgb_ycc_convert_internal
michael@0: #undef rgb_gray_convert_internal
michael@0: #undef rgb_rgb_convert_internal
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Initialize for RGB->YCC colorspace conversion.
michael@0:  */
michael@0: 
michael@0: METHODDEF(void)
michael@0: rgb_ycc_start (j_compress_ptr cinfo)
michael@0: {
michael@0:   my_cconvert_ptr cconvert = (my_cconvert_ptr) cinfo->cconvert;
michael@0:   INT32 * rgb_ycc_tab;
michael@0:   INT32 i;
michael@0: 
michael@0:   /* Allocate and fill in the conversion tables. */
michael@0:   cconvert->rgb_ycc_tab = rgb_ycc_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_ycc_tab[i+R_Y_OFF] = FIX(0.29900) * i;
michael@0:     rgb_ycc_tab[i+G_Y_OFF] = FIX(0.58700) * i;
michael@0:     rgb_ycc_tab[i+B_Y_OFF] = FIX(0.11400) * i     + ONE_HALF;
michael@0:     rgb_ycc_tab[i+R_CB_OFF] = (-FIX(0.16874)) * i;
michael@0:     rgb_ycc_tab[i+G_CB_OFF] = (-FIX(0.33126)) * i;
michael@0:     /* We use a rounding fudge-factor of 0.5-epsilon for Cb and Cr.
michael@0:      * This ensures that the maximum output will round to MAXJSAMPLE
michael@0:      * not MAXJSAMPLE+1, and thus that we don't have to range-limit.
michael@0:      */
michael@0:     rgb_ycc_tab[i+B_CB_OFF] = FIX(0.50000) * i    + CBCR_OFFSET + ONE_HALF-1;
michael@0: /*  B=>Cb and R=>Cr tables are the same
michael@0:     rgb_ycc_tab[i+R_CR_OFF] = FIX(0.50000) * i    + CBCR_OFFSET + ONE_HALF-1;
michael@0: */
michael@0:     rgb_ycc_tab[i+G_CR_OFF] = (-FIX(0.41869)) * i;
michael@0:     rgb_ycc_tab[i+B_CR_OFF] = (-FIX(0.08131)) * i;
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Convert some rows of samples to the JPEG colorspace.
michael@0:  */
michael@0: 
michael@0: METHODDEF(void)
michael@0: rgb_ycc_convert (j_compress_ptr cinfo,
michael@0: 		 JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
michael@0: 		 JDIMENSION output_row, int num_rows)
michael@0: {
michael@0:   switch (cinfo->in_color_space) {
michael@0:     case JCS_EXT_RGB:
michael@0:       extrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                   num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_RGBX:
michael@0:     case JCS_EXT_RGBA:
michael@0:       extrgbx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_BGR:
michael@0:       extbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                   num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_BGRX:
michael@0:     case JCS_EXT_BGRA:
michael@0:       extbgrx_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_XBGR:
michael@0:     case JCS_EXT_ABGR:
michael@0:       extxbgr_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_XRGB:
michael@0:     case JCS_EXT_ARGB:
michael@0:       extxrgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     default:
michael@0:       rgb_ycc_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                num_rows);
michael@0:       break;
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /**************** Cases other than RGB -> YCbCr **************/
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Convert some rows of samples to the JPEG colorspace.
michael@0:  */
michael@0: 
michael@0: METHODDEF(void)
michael@0: rgb_gray_convert (j_compress_ptr cinfo,
michael@0: 		  JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
michael@0: 		  JDIMENSION output_row, int num_rows)
michael@0: {
michael@0:   switch (cinfo->in_color_space) {
michael@0:     case JCS_EXT_RGB:
michael@0:       extrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_RGBX:
michael@0:     case JCS_EXT_RGBA:
michael@0:       extrgbx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                     num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_BGR:
michael@0:       extbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_BGRX:
michael@0:     case JCS_EXT_BGRA:
michael@0:       extbgrx_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                     num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_XBGR:
michael@0:     case JCS_EXT_ABGR:
michael@0:       extxbgr_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                     num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_XRGB:
michael@0:     case JCS_EXT_ARGB:
michael@0:       extxrgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                     num_rows);
michael@0:       break;
michael@0:     default:
michael@0:       rgb_gray_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                 num_rows);
michael@0:       break;
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Extended RGB to plain RGB conversion
michael@0:  */
michael@0: 
michael@0: METHODDEF(void)
michael@0: rgb_rgb_convert (j_compress_ptr cinfo,
michael@0: 		  JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
michael@0: 		  JDIMENSION output_row, int num_rows)
michael@0: {
michael@0:   switch (cinfo->in_color_space) {
michael@0:     case JCS_EXT_RGB:
michael@0:       extrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                   num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_RGBX:
michael@0:     case JCS_EXT_RGBA:
michael@0:       extrgbx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_BGR:
michael@0:       extbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                   num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_BGRX:
michael@0:     case JCS_EXT_BGRA:
michael@0:       extbgrx_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_XBGR:
michael@0:     case JCS_EXT_ABGR:
michael@0:       extxbgr_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     case JCS_EXT_XRGB:
michael@0:     case JCS_EXT_ARGB:
michael@0:       extxrgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                    num_rows);
michael@0:       break;
michael@0:     default:
michael@0:       rgb_rgb_convert_internal(cinfo, input_buf, output_buf, output_row,
michael@0:                                num_rows);
michael@0:       break;
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Convert some rows of samples to the JPEG colorspace.
michael@0:  * This version handles Adobe-style CMYK->YCCK conversion,
michael@0:  * where we convert R=1-C, G=1-M, and B=1-Y to YCbCr using the same
michael@0:  * conversion as above, while passing K (black) unchanged.
michael@0:  * We assume rgb_ycc_start has been called.
michael@0:  */
michael@0: 
michael@0: METHODDEF(void)
michael@0: cmyk_ycck_convert (j_compress_ptr cinfo,
michael@0: 		   JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
michael@0: 		   JDIMENSION output_row, 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_ycc_tab;
michael@0:   register JSAMPROW inptr;
michael@0:   register JSAMPROW outptr0, outptr1, outptr2, outptr3;
michael@0:   register JDIMENSION col;
michael@0:   JDIMENSION num_cols = cinfo->image_width;
michael@0: 
michael@0:   while (--num_rows >= 0) {
michael@0:     inptr = *input_buf++;
michael@0:     outptr0 = output_buf[0][output_row];
michael@0:     outptr1 = output_buf[1][output_row];
michael@0:     outptr2 = output_buf[2][output_row];
michael@0:     outptr3 = output_buf[3][output_row];
michael@0:     output_row++;
michael@0:     for (col = 0; col < num_cols; col++) {
michael@0:       r = MAXJSAMPLE - GETJSAMPLE(inptr[0]);
michael@0:       g = MAXJSAMPLE - GETJSAMPLE(inptr[1]);
michael@0:       b = MAXJSAMPLE - GETJSAMPLE(inptr[2]);
michael@0:       /* K passes through as-is */
michael@0:       outptr3[col] = inptr[3];	/* don't need GETJSAMPLE here */
michael@0:       inptr += 4;
michael@0:       /* If the inputs are 0..MAXJSAMPLE, the outputs of these equations
michael@0:        * must be too; we do not need an explicit range-limiting operation.
michael@0:        * Hence the value being shifted is never negative, and we don't
michael@0:        * need the general RIGHT_SHIFT macro.
michael@0:        */
michael@0:       /* Y */
michael@0:       outptr0[col] = (JSAMPLE)
michael@0: 		((ctab[r+R_Y_OFF] + ctab[g+G_Y_OFF] + ctab[b+B_Y_OFF])
michael@0: 		 >> SCALEBITS);
michael@0:       /* Cb */
michael@0:       outptr1[col] = (JSAMPLE)
michael@0: 		((ctab[r+R_CB_OFF] + ctab[g+G_CB_OFF] + ctab[b+B_CB_OFF])
michael@0: 		 >> SCALEBITS);
michael@0:       /* Cr */
michael@0:       outptr2[col] = (JSAMPLE)
michael@0: 		((ctab[r+R_CR_OFF] + ctab[g+G_CR_OFF] + ctab[b+B_CR_OFF])
michael@0: 		 >> SCALEBITS);
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Convert some rows of samples to the JPEG colorspace.
michael@0:  * This version handles grayscale output with no conversion.
michael@0:  * The source can be either plain grayscale or YCbCr (since Y == gray).
michael@0:  */
michael@0: 
michael@0: METHODDEF(void)
michael@0: grayscale_convert (j_compress_ptr cinfo,
michael@0: 		   JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
michael@0: 		   JDIMENSION output_row, int num_rows)
michael@0: {
michael@0:   register JSAMPROW inptr;
michael@0:   register JSAMPROW outptr;
michael@0:   register JDIMENSION col;
michael@0:   JDIMENSION num_cols = cinfo->image_width;
michael@0:   int instride = cinfo->input_components;
michael@0: 
michael@0:   while (--num_rows >= 0) {
michael@0:     inptr = *input_buf++;
michael@0:     outptr = output_buf[0][output_row];
michael@0:     output_row++;
michael@0:     for (col = 0; col < num_cols; col++) {
michael@0:       outptr[col] = inptr[0];	/* don't need GETJSAMPLE() here */
michael@0:       inptr += instride;
michael@0:     }
michael@0:   }
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Convert some rows of samples to the JPEG colorspace.
michael@0:  * This version handles multi-component colorspaces without conversion.
michael@0:  * We assume input_components == num_components.
michael@0:  */
michael@0: 
michael@0: METHODDEF(void)
michael@0: null_convert (j_compress_ptr cinfo,
michael@0: 	      JSAMPARRAY input_buf, JSAMPIMAGE output_buf,
michael@0: 	      JDIMENSION output_row, int num_rows)
michael@0: {
michael@0:   register JSAMPROW inptr;
michael@0:   register JSAMPROW outptr;
michael@0:   register JDIMENSION col;
michael@0:   register int ci;
michael@0:   int nc = cinfo->num_components;
michael@0:   JDIMENSION num_cols = cinfo->image_width;
michael@0: 
michael@0:   while (--num_rows >= 0) {
michael@0:     /* It seems fastest to make a separate pass for each component. */
michael@0:     for (ci = 0; ci < nc; ci++) {
michael@0:       inptr = *input_buf;
michael@0:       outptr = output_buf[ci][output_row];
michael@0:       for (col = 0; col < num_cols; col++) {
michael@0: 	outptr[col] = inptr[ci]; /* don't need GETJSAMPLE() here */
michael@0: 	inptr += nc;
michael@0:       }
michael@0:     }
michael@0:     input_buf++;
michael@0:     output_row++;
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: null_method (j_compress_ptr cinfo)
michael@0: {
michael@0:   /* no work needed */
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Module initialization routine for input colorspace conversion.
michael@0:  */
michael@0: 
michael@0: GLOBAL(void)
michael@0: jinit_color_converter (j_compress_ptr cinfo)
michael@0: {
michael@0:   my_cconvert_ptr cconvert;
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_converter));
michael@0:   cinfo->cconvert = (struct jpeg_color_converter *) cconvert;
michael@0:   /* set start_pass to null method until we find out differently */
michael@0:   cconvert->pub.start_pass = null_method;
michael@0: 
michael@0:   /* Make sure input_components agrees with in_color_space */
michael@0:   switch (cinfo->in_color_space) {
michael@0:   case JCS_GRAYSCALE:
michael@0:     if (cinfo->input_components != 1)
michael@0:       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
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:     if (cinfo->input_components != rgb_pixelsize[cinfo->in_color_space])
michael@0:       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
michael@0:     break;
michael@0: 
michael@0:   case JCS_YCbCr:
michael@0:     if (cinfo->input_components != 3)
michael@0:       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
michael@0:     break;
michael@0: 
michael@0:   case JCS_CMYK:
michael@0:   case JCS_YCCK:
michael@0:     if (cinfo->input_components != 4)
michael@0:       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
michael@0:     break;
michael@0: 
michael@0:   default:			/* JCS_UNKNOWN can be anything */
michael@0:     if (cinfo->input_components < 1)
michael@0:       ERREXIT(cinfo, JERR_BAD_IN_COLORSPACE);
michael@0:     break;
michael@0:   }
michael@0: 
michael@0:   /* Check num_components, set conversion method based on requested 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:     if (cinfo->in_color_space == JCS_GRAYSCALE)
michael@0:       cconvert->pub.color_convert = grayscale_convert;
michael@0:     else if (cinfo->in_color_space == JCS_RGB ||
michael@0:              cinfo->in_color_space == JCS_EXT_RGB ||
michael@0:              cinfo->in_color_space == JCS_EXT_RGBX ||
michael@0:              cinfo->in_color_space == JCS_EXT_BGR ||
michael@0:              cinfo->in_color_space == JCS_EXT_BGRX ||
michael@0:              cinfo->in_color_space == JCS_EXT_XBGR ||
michael@0:              cinfo->in_color_space == JCS_EXT_XRGB ||
michael@0:              cinfo->in_color_space == JCS_EXT_RGBA ||
michael@0:              cinfo->in_color_space == JCS_EXT_BGRA ||
michael@0:              cinfo->in_color_space == JCS_EXT_ABGR ||
michael@0:              cinfo->in_color_space == JCS_EXT_ARGB) {
michael@0:       if (jsimd_can_rgb_gray())
michael@0:         cconvert->pub.color_convert = jsimd_rgb_gray_convert;
michael@0:       else {
michael@0:         cconvert->pub.start_pass = rgb_ycc_start;
michael@0:         cconvert->pub.color_convert = rgb_gray_convert;
michael@0:       }
michael@0:     } else if (cinfo->in_color_space == JCS_YCbCr)
michael@0:       cconvert->pub.color_convert = grayscale_convert;
michael@0:     else
michael@0:       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
michael@0:     break;
michael@0: 
michael@0:   case JCS_RGB:
michael@0:     if (cinfo->num_components != 3)
michael@0:       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
michael@0:     if (rgb_red[cinfo->in_color_space] == 0 &&
michael@0:         rgb_green[cinfo->in_color_space] == 1 &&
michael@0:         rgb_blue[cinfo->in_color_space] == 2 &&
michael@0:         rgb_pixelsize[cinfo->in_color_space] == 3)
michael@0:       cconvert->pub.color_convert = null_convert;
michael@0:     else if (cinfo->in_color_space == JCS_RGB ||
michael@0:              cinfo->in_color_space == JCS_EXT_RGB ||
michael@0:              cinfo->in_color_space == JCS_EXT_RGBX ||
michael@0:              cinfo->in_color_space == JCS_EXT_BGR ||
michael@0:              cinfo->in_color_space == JCS_EXT_BGRX ||
michael@0:              cinfo->in_color_space == JCS_EXT_XBGR ||
michael@0:              cinfo->in_color_space == JCS_EXT_XRGB ||
michael@0:              cinfo->in_color_space == JCS_EXT_RGBA ||
michael@0:              cinfo->in_color_space == JCS_EXT_BGRA ||
michael@0:              cinfo->in_color_space == JCS_EXT_ABGR ||
michael@0:              cinfo->in_color_space == JCS_EXT_ARGB)
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_YCbCr:
michael@0:     if (cinfo->num_components != 3)
michael@0:       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
michael@0:     if (cinfo->in_color_space == JCS_RGB ||
michael@0:         cinfo->in_color_space == JCS_EXT_RGB ||
michael@0:         cinfo->in_color_space == JCS_EXT_RGBX ||
michael@0:         cinfo->in_color_space == JCS_EXT_BGR ||
michael@0:         cinfo->in_color_space == JCS_EXT_BGRX ||
michael@0:         cinfo->in_color_space == JCS_EXT_XBGR ||
michael@0:         cinfo->in_color_space == JCS_EXT_XRGB ||
michael@0:         cinfo->in_color_space == JCS_EXT_RGBA ||
michael@0:         cinfo->in_color_space == JCS_EXT_BGRA ||
michael@0:         cinfo->in_color_space == JCS_EXT_ABGR ||
michael@0:         cinfo->in_color_space == JCS_EXT_ARGB) {
michael@0:       if (jsimd_can_rgb_ycc())
michael@0:         cconvert->pub.color_convert = jsimd_rgb_ycc_convert;
michael@0:       else {
michael@0:         cconvert->pub.start_pass = rgb_ycc_start;
michael@0:         cconvert->pub.color_convert = rgb_ycc_convert;
michael@0:       }
michael@0:     } else if (cinfo->in_color_space == JCS_YCbCr)
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:   case JCS_CMYK:
michael@0:     if (cinfo->num_components != 4)
michael@0:       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
michael@0:     if (cinfo->in_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:   case JCS_YCCK:
michael@0:     if (cinfo->num_components != 4)
michael@0:       ERREXIT(cinfo, JERR_BAD_J_COLORSPACE);
michael@0:     if (cinfo->in_color_space == JCS_CMYK) {
michael@0:       cconvert->pub.start_pass = rgb_ycc_start;
michael@0:       cconvert->pub.color_convert = cmyk_ycck_convert;
michael@0:     } else if (cinfo->in_color_space == JCS_YCCK)
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:			/* allow null conversion of JCS_UNKNOWN */
michael@0:     if (cinfo->jpeg_color_space != cinfo->in_color_space ||
michael@0: 	cinfo->num_components != cinfo->input_components)
michael@0:       ERREXIT(cinfo, JERR_CONVERSION_NOTIMPL);
michael@0:     cconvert->pub.color_convert = null_convert;
michael@0:     break;
michael@0:   }
michael@0: }