FFmpeg/libswscale/rgb2rgb.c

/*
 *
 *  rgb2rgb.c, Software RGB to RGB convertor
 *  pluralize by Software PAL8 to RGB convertor
 *               Software YUV to YUV convertor
 *               Software YUV to RGB convertor
 *  Written by Nick Kurshev.
 *  palette & YUV & runtime CPU stuff by Michael (michaelni@gmx.at)
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
 * 
 * the C code (not assembly, mmx, ...) of this file can be used
 * under the LGPL license too
 */
#include <inttypes.h>
#include "config.h"
#include "rgb2rgb.h"
#include "swscale.h"
#include "swscale_internal.h"
#include "x86_cpu.h"
#include "bswap.h"
#ifdef USE_FASTMEMCPY
#include "libvo/fastmemcpy.h"
#endif

#define FAST_BGR2YV12 // use 7 bit coeffs instead of 15bit

void (*rgb24to32)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb24to16)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb24to15)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb32to24)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb32to16)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb32to15)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb15to16)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb15to24)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb15to32)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb16to15)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb16to24)(const uint8_t *src,uint8_t *dst,long src_size);
void (*rgb16to32)(const uint8_t *src,uint8_t *dst,long src_size);
//void (*rgb24tobgr32)(const uint8_t *src, uint8_t *dst, long src_size);
void (*rgb24tobgr24)(const uint8_t *src, uint8_t *dst, long src_size);
void (*rgb24tobgr16)(const uint8_t *src, uint8_t *dst, long src_size);
void (*rgb24tobgr15)(const uint8_t *src, uint8_t *dst, long src_size);
void (*rgb32tobgr32)(const uint8_t *src, uint8_t *dst, long src_size);
//void (*rgb32tobgr24)(const uint8_t *src, uint8_t *dst, long src_size);
void (*rgb32tobgr16)(const uint8_t *src, uint8_t *dst, long src_size);
void (*rgb32tobgr15)(const uint8_t *src, uint8_t *dst, long src_size);

void (*yv12toyuy2)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
	long width, long height,
	long lumStride, long chromStride, long dstStride);
void (*yv12touyvy)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
	long width, long height,
	long lumStride, long chromStride, long dstStride);
void (*yuv422ptoyuy2)(const uint8_t *ysrc, const uint8_t *usrc, const uint8_t *vsrc, uint8_t *dst,
	long width, long height,
	long lumStride, long chromStride, long dstStride);
void (*yuy2toyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
	long width, long height,
	long lumStride, long chromStride, long srcStride);
void (*rgb24toyv12)(const uint8_t *src, uint8_t *ydst, uint8_t *udst, uint8_t *vdst,
	long width, long height,
	long lumStride, long chromStride, long srcStride);
void (*planar2x)(const uint8_t *src, uint8_t *dst, long width, long height,
	long srcStride, long dstStride);
void (*interleaveBytes)(uint8_t *src1, uint8_t *src2, uint8_t *dst,
			    long width, long height, long src1Stride,
			    long src2Stride, long dstStride);
void (*vu9_to_vu12)(const uint8_t *src1, const uint8_t *src2,
			uint8_t *dst1, uint8_t *dst2,
			long width, long height,
			long srcStride1, long srcStride2,
			long dstStride1, long dstStride2);
void (*yvu9_to_yuy2)(const uint8_t *src1, const uint8_t *src2, const uint8_t *src3,
			uint8_t *dst,
			long width, long height,
			long srcStride1, long srcStride2,
			long srcStride3, long dstStride);

#if defined(ARCH_X86) && defined(CONFIG_GPL)
static const uint64_t mmx_null  __attribute__((aligned(8))) = 0x0000000000000000ULL;
static const uint64_t mmx_one   __attribute__((aligned(8))) = 0xFFFFFFFFFFFFFFFFULL;
static const uint64_t mask32b  attribute_used __attribute__((aligned(8))) = 0x000000FF000000FFULL;
static const uint64_t mask32g  attribute_used __attribute__((aligned(8))) = 0x0000FF000000FF00ULL;
static const uint64_t mask32r  attribute_used __attribute__((aligned(8))) = 0x00FF000000FF0000ULL;
static const uint64_t mask32   __attribute__((aligned(8))) = 0x00FFFFFF00FFFFFFULL;
static const uint64_t mask3216br __attribute__((aligned(8)))=0x00F800F800F800F8ULL;
static const uint64_t mask3216g  __attribute__((aligned(8)))=0x0000FC000000FC00ULL;
static const uint64_t mask3215g  __attribute__((aligned(8)))=0x0000F8000000F800ULL;
static const uint64_t mul3216  __attribute__((aligned(8))) = 0x2000000420000004ULL;
static const uint64_t mul3215  __attribute__((aligned(8))) = 0x2000000820000008ULL;
static const uint64_t mask24b  attribute_used __attribute__((aligned(8))) = 0x00FF0000FF0000FFULL;
static const uint64_t mask24g  attribute_used __attribute__((aligned(8))) = 0xFF0000FF0000FF00ULL;
static const uint64_t mask24r  attribute_used __attribute__((aligned(8))) = 0x0000FF0000FF0000ULL;
static const uint64_t mask24l  __attribute__((aligned(8))) = 0x0000000000FFFFFFULL;
static const uint64_t mask24h  __attribute__((aligned(8))) = 0x0000FFFFFF000000ULL;
static const uint64_t mask24hh  __attribute__((aligned(8))) = 0xffff000000000000ULL;
static const uint64_t mask24hhh  __attribute__((aligned(8))) = 0xffffffff00000000ULL;
static const uint64_t mask24hhhh  __attribute__((aligned(8))) = 0xffffffffffff0000ULL;
static const uint64_t mask15b  __attribute__((aligned(8))) = 0x001F001F001F001FULL; /* 00000000 00011111  xxB */
static const uint64_t mask15rg __attribute__((aligned(8))) = 0x7FE07FE07FE07FE0ULL; /* 01111111 11100000  RGx */
static const uint64_t mask15s  __attribute__((aligned(8))) = 0xFFE0FFE0FFE0FFE0ULL;
static const uint64_t mask15g  __attribute__((aligned(8))) = 0x03E003E003E003E0ULL;
static const uint64_t mask15r  __attribute__((aligned(8))) = 0x7C007C007C007C00ULL;
#define mask16b mask15b
static const uint64_t mask16g  __attribute__((aligned(8))) = 0x07E007E007E007E0ULL;
static const uint64_t mask16r  __attribute__((aligned(8))) = 0xF800F800F800F800ULL;
static const uint64_t red_16mask  __attribute__((aligned(8))) = 0x0000f8000000f800ULL;
static const uint64_t green_16mask __attribute__((aligned(8)))= 0x000007e0000007e0ULL;
static const uint64_t blue_16mask __attribute__((aligned(8))) = 0x0000001f0000001fULL;
static const uint64_t red_15mask  __attribute__((aligned(8))) = 0x00007c000000f800ULL;
static const uint64_t green_15mask __attribute__((aligned(8)))= 0x000003e0000007e0ULL;
static const uint64_t blue_15mask __attribute__((aligned(8))) = 0x0000001f0000001fULL;

#ifdef FAST_BGR2YV12
static const uint64_t bgr2YCoeff  attribute_used __attribute__((aligned(8))) = 0x000000210041000DULL;
static const uint64_t bgr2UCoeff  attribute_used __attribute__((aligned(8))) = 0x0000FFEEFFDC0038ULL;
static const uint64_t bgr2VCoeff  attribute_used __attribute__((aligned(8))) = 0x00000038FFD2FFF8ULL;
#else
static const uint64_t bgr2YCoeff  attribute_used __attribute__((aligned(8))) = 0x000020E540830C8BULL;
static const uint64_t bgr2UCoeff  attribute_used __attribute__((aligned(8))) = 0x0000ED0FDAC23831ULL;
static const uint64_t bgr2VCoeff  attribute_used __attribute__((aligned(8))) = 0x00003831D0E6F6EAULL;
#endif
static const uint64_t bgr2YOffset attribute_used __attribute__((aligned(8))) = 0x1010101010101010ULL;
static const uint64_t bgr2UVOffset attribute_used __attribute__((aligned(8)))= 0x8080808080808080ULL;
static const uint64_t w1111       attribute_used __attribute__((aligned(8))) = 0x0001000100010001ULL;

#if 0
static volatile uint64_t __attribute__((aligned(8))) b5Dither;
static volatile uint64_t __attribute__((aligned(8))) g5Dither;
static volatile uint64_t __attribute__((aligned(8))) g6Dither;
static volatile uint64_t __attribute__((aligned(8))) r5Dither;

static uint64_t __attribute__((aligned(8))) dither4[2]={
	0x0103010301030103LL,
	0x0200020002000200LL,};

static uint64_t __attribute__((aligned(8))) dither8[2]={
	0x0602060206020602LL,
	0x0004000400040004LL,};
#endif
#endif /* defined(ARCH_X86) */

#define RGB2YUV_SHIFT 8
#define BY ((int)( 0.098*(1<<RGB2YUV_SHIFT)+0.5))
#define BV ((int)(-0.071*(1<<RGB2YUV_SHIFT)+0.5))
#define BU ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
#define GY ((int)( 0.504*(1<<RGB2YUV_SHIFT)+0.5))
#define GV ((int)(-0.368*(1<<RGB2YUV_SHIFT)+0.5))
#define GU ((int)(-0.291*(1<<RGB2YUV_SHIFT)+0.5))
#define RY ((int)( 0.257*(1<<RGB2YUV_SHIFT)+0.5))
#define RV ((int)( 0.439*(1<<RGB2YUV_SHIFT)+0.5))
#define RU ((int)(-0.148*(1<<RGB2YUV_SHIFT)+0.5))

//Note: we have C, MMX, MMX2, 3DNOW version therse no 3DNOW+MMX2 one
//Plain C versions
#undef HAVE_MMX
#undef HAVE_MMX2
#undef HAVE_3DNOW
#undef HAVE_SSE2
#define RENAME(a) a ## _C
#include "rgb2rgb_template.c"

#if defined(ARCH_X86) && defined(CONFIG_GPL)

//MMX versions
#undef RENAME
#define HAVE_MMX
#undef HAVE_MMX2
#undef HAVE_3DNOW
#undef HAVE_SSE2
#define RENAME(a) a ## _MMX
#include "rgb2rgb_template.c"

//MMX2 versions
#undef RENAME
#define HAVE_MMX
#define HAVE_MMX2
#undef HAVE_3DNOW
#undef HAVE_SSE2
#define RENAME(a) a ## _MMX2
#include "rgb2rgb_template.c"

//3DNOW versions
#undef RENAME
#define HAVE_MMX
#undef HAVE_MMX2
#define HAVE_3DNOW
#undef HAVE_SSE2
#define RENAME(a) a ## _3DNOW
#include "rgb2rgb_template.c"

#endif //ARCH_X86 || ARCH_X86_64

/*
 rgb15->rgb16 Original by Strepto/Astral
 ported to gcc & bugfixed : A'rpi
 MMX2, 3DNOW optimization by Nick Kurshev
 32bit c version, and and&add trick by Michael Niedermayer
*/

void sws_rgb2rgb_init(int flags){
#if (defined(HAVE_MMX2) || defined(HAVE_3DNOW) || defined(HAVE_MMX))  && defined(CONFIG_GPL)
	if(flags & SWS_CPU_CAPS_MMX2){
		rgb15to16= rgb15to16_MMX2;
		rgb15to24= rgb15to24_MMX2;
		rgb15to32= rgb15to32_MMX2;
		rgb16to24= rgb16to24_MMX2;
		rgb16to32= rgb16to32_MMX2;
		rgb16to15= rgb16to15_MMX2;
		rgb24to16= rgb24to16_MMX2;
		rgb24to15= rgb24to15_MMX2;
		rgb24to32= rgb24to32_MMX2;
		rgb32to16= rgb32to16_MMX2;
		rgb32to15= rgb32to15_MMX2;
		rgb32to24= rgb32to24_MMX2;
		rgb24tobgr15= rgb24tobgr15_MMX2;
		rgb24tobgr16= rgb24tobgr16_MMX2;
		rgb24tobgr24= rgb24tobgr24_MMX2;
		rgb32tobgr32= rgb32tobgr32_MMX2;
		rgb32tobgr16= rgb32tobgr16_MMX2;
		rgb32tobgr15= rgb32tobgr15_MMX2;
		yv12toyuy2= yv12toyuy2_MMX2;
		yv12touyvy= yv12touyvy_MMX2;
		yuv422ptoyuy2= yuv422ptoyuy2_MMX2;
		yuy2toyv12= yuy2toyv12_MMX2;
//		uyvytoyv12= uyvytoyv12_MMX2;
//		yvu9toyv12= yvu9toyv12_MMX2;
		planar2x= planar2x_MMX2;
		rgb24toyv12= rgb24toyv12_MMX2;
		interleaveBytes= interleaveBytes_MMX2;
		vu9_to_vu12= vu9_to_vu12_MMX2;
		yvu9_to_yuy2= yvu9_to_yuy2_MMX2;
	}else if(flags & SWS_CPU_CAPS_3DNOW){
		rgb15to16= rgb15to16_3DNOW;
		rgb15to24= rgb15to24_3DNOW;
		rgb15to32= rgb15to32_3DNOW;
		rgb16to24= rgb16to24_3DNOW;
		rgb16to32= rgb16to32_3DNOW;
		rgb16to15= rgb16to15_3DNOW;
		rgb24to16= rgb24to16_3DNOW;
		rgb24to15= rgb24to15_3DNOW;
		rgb24to32= rgb24to32_3DNOW;
		rgb32to16= rgb32to16_3DNOW;
		rgb32to15= rgb32to15_3DNOW;
		rgb32to24= rgb32to24_3DNOW;
		rgb24tobgr15= rgb24tobgr15_3DNOW;
		rgb24tobgr16= rgb24tobgr16_3DNOW;
		rgb24tobgr24= rgb24tobgr24_3DNOW;
		rgb32tobgr32= rgb32tobgr32_3DNOW;
		rgb32tobgr16= rgb32tobgr16_3DNOW;
		rgb32tobgr15= rgb32tobgr15_3DNOW;
		yv12toyuy2= yv12toyuy2_3DNOW;
		yv12touyvy= yv12touyvy_3DNOW;
		yuv422ptoyuy2= yuv422ptoyuy2_3DNOW;
		yuy2toyv12= yuy2toyv12_3DNOW;
//		uyvytoyv12= uyvytoyv12_3DNOW;
//		yvu9toyv12= yvu9toyv12_3DNOW;
		planar2x= planar2x_3DNOW;
		rgb24toyv12= rgb24toyv12_3DNOW;
		interleaveBytes= interleaveBytes_3DNOW;
		vu9_to_vu12= vu9_to_vu12_3DNOW;
		yvu9_to_yuy2= yvu9_to_yuy2_3DNOW;
	}else if(flags & SWS_CPU_CAPS_MMX){
		rgb15to16= rgb15to16_MMX;
		rgb15to24= rgb15to24_MMX;
		rgb15to32= rgb15to32_MMX;
		rgb16to24= rgb16to24_MMX;
		rgb16to32= rgb16to32_MMX;
		rgb16to15= rgb16to15_MMX;
		rgb24to16= rgb24to16_MMX;
		rgb24to15= rgb24to15_MMX;
		rgb24to32= rgb24to32_MMX;
		rgb32to16= rgb32to16_MMX;
		rgb32to15= rgb32to15_MMX;
		rgb32to24= rgb32to24_MMX;
		rgb24tobgr15= rgb24tobgr15_MMX;
		rgb24tobgr16= rgb24tobgr16_MMX;
		rgb24tobgr24= rgb24tobgr24_MMX;
		rgb32tobgr32= rgb32tobgr32_MMX;
		rgb32tobgr16= rgb32tobgr16_MMX;
		rgb32tobgr15= rgb32tobgr15_MMX;
		yv12toyuy2= yv12toyuy2_MMX;
		yv12touyvy= yv12touyvy_MMX;
		yuv422ptoyuy2= yuv422ptoyuy2_MMX;
		yuy2toyv12= yuy2toyv12_MMX;
//		uyvytoyv12= uyvytoyv12_MMX;
//		yvu9toyv12= yvu9toyv12_MMX;
		planar2x= planar2x_MMX;
		rgb24toyv12= rgb24toyv12_MMX;
		interleaveBytes= interleaveBytes_MMX;
		vu9_to_vu12= vu9_to_vu12_MMX;
		yvu9_to_yuy2= yvu9_to_yuy2_MMX;
	}else
#endif /* defined(HAVE_MMX2) || defined(HAVE_3DNOW) || defined(HAVE_MMX) */
	{
		rgb15to16= rgb15to16_C;
		rgb15to24= rgb15to24_C;
		rgb15to32= rgb15to32_C;
		rgb16to24= rgb16to24_C;
		rgb16to32= rgb16to32_C;
		rgb16to15= rgb16to15_C;
		rgb24to16= rgb24to16_C;
		rgb24to15= rgb24to15_C;
		rgb24to32= rgb24to32_C;
		rgb32to16= rgb32to16_C;
		rgb32to15= rgb32to15_C;
		rgb32to24= rgb32to24_C;
		rgb24tobgr15= rgb24tobgr15_C;
		rgb24tobgr16= rgb24tobgr16_C;
		rgb24tobgr24= rgb24tobgr24_C;
		rgb32tobgr32= rgb32tobgr32_C;
		rgb32tobgr16= rgb32tobgr16_C;
		rgb32tobgr15= rgb32tobgr15_C;
		yv12toyuy2= yv12toyuy2_C;
		yv12touyvy= yv12touyvy_C;
		yuv422ptoyuy2= yuv422ptoyuy2_C;
		yuy2toyv12= yuy2toyv12_C;
//		uyvytoyv12= uyvytoyv12_C;
//		yvu9toyv12= yvu9toyv12_C;
		planar2x= planar2x_C;
		rgb24toyv12= rgb24toyv12_C;
		interleaveBytes= interleaveBytes_C;
		vu9_to_vu12= vu9_to_vu12_C;
		yvu9_to_yuy2= yvu9_to_yuy2_C;
	}
}

/**
 * Palette is assumed to contain BGR32.
 */
void palette8torgb32(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;

/*
	for(i=0; i<num_pixels; i++)
		((unsigned *)dst)[i] = ((unsigned *)palette)[ src[i] ];
*/

	for(i=0; i<num_pixels; i++)
	{
		#ifdef WORDS_BIGENDIAN
			dst[3]= palette[ src[i]*4+2 ];
			dst[2]= palette[ src[i]*4+1 ];
			dst[1]= palette[ src[i]*4+0 ];
		#else
		//FIXME slow?
			dst[0]= palette[ src[i]*4+2 ];
			dst[1]= palette[ src[i]*4+1 ];
			dst[2]= palette[ src[i]*4+0 ];
			//dst[3]= 0; /* do we need this cleansing? */
		#endif
		dst+= 4;
	}
}

void palette8tobgr32(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;
	for(i=0; i<num_pixels; i++)
	{
		#ifdef WORDS_BIGENDIAN
			dst[3]= palette[ src[i]*4+0 ];
			dst[2]= palette[ src[i]*4+1 ];
			dst[1]= palette[ src[i]*4+2 ];
		#else
			//FIXME slow?
			dst[0]= palette[ src[i]*4+0 ];
			dst[1]= palette[ src[i]*4+1 ];
			dst[2]= palette[ src[i]*4+2 ];
			//dst[3]= 0; /* do we need this cleansing? */
		#endif
		
		dst+= 4;
	}
}

/**
 * Palette is assumed to contain BGR32.
 */
void palette8torgb24(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;
/*
	writes 1 byte o much and might cause alignment issues on some architectures?
	for(i=0; i<num_pixels; i++)
		((unsigned *)(&dst[i*3])) = ((unsigned *)palette)[ src[i] ];
*/
	for(i=0; i<num_pixels; i++)
	{
		//FIXME slow?
		dst[0]= palette[ src[i]*4+2 ];
		dst[1]= palette[ src[i]*4+1 ];
		dst[2]= palette[ src[i]*4+0 ];
		dst+= 3;
	}
}

void palette8tobgr24(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;
/*
	writes 1 byte o much and might cause alignment issues on some architectures?
	for(i=0; i<num_pixels; i++)
		((unsigned *)(&dst[i*3])) = ((unsigned *)palette)[ src[i] ];
*/
	for(i=0; i<num_pixels; i++)
	{
		//FIXME slow?
		dst[0]= palette[ src[i]*4+0 ];
		dst[1]= palette[ src[i]*4+1 ];
		dst[2]= palette[ src[i]*4+2 ];
		dst+= 3;
	}
}

/**
 * Palette is assumed to contain bgr16, see rgb32to16 to convert the palette
 */
void palette8torgb16(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;
	for(i=0; i<num_pixels; i++)
		((uint16_t *)dst)[i] = ((uint16_t *)palette)[ src[i] ];
}
void palette8tobgr16(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;
	for(i=0; i<num_pixels; i++)
		((uint16_t *)dst)[i] = bswap_16(((uint16_t *)palette)[ src[i] ]);
}

/**
 * Palette is assumed to contain BGR15, see rgb32to15 to convert the palette.
 */
void palette8torgb15(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;
	for(i=0; i<num_pixels; i++)
		((uint16_t *)dst)[i] = ((uint16_t *)palette)[ src[i] ];
}
void palette8tobgr15(const uint8_t *src, uint8_t *dst, long num_pixels, const uint8_t *palette)
{
	long i;
	for(i=0; i<num_pixels; i++)
		((uint16_t *)dst)[i] = bswap_16(((uint16_t *)palette)[ src[i] ]);
}

void rgb32tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
{
	long i;
	long num_pixels = src_size >> 2;
	for(i=0; i<num_pixels; i++)
	{
		#ifdef WORDS_BIGENDIAN
			/* RGB32 (= A,B,G,R) -> BGR24 (= B,G,R) */
			dst[3*i + 0] = src[4*i + 1];
			dst[3*i + 1] = src[4*i + 2];
			dst[3*i + 2] = src[4*i + 3];
		#else
			dst[3*i + 0] = src[4*i + 2];
			dst[3*i + 1] = src[4*i + 1];
			dst[3*i + 2] = src[4*i + 0];
		#endif
	}
}

void rgb24tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
{
	long i;
	for(i=0; 3*i<src_size; i++)
	{
		#ifdef WORDS_BIGENDIAN
			/* RGB24 (= R,G,B) -> BGR32 (= A,R,G,B) */
			dst[4*i + 0] = 0;
			dst[4*i + 1] = src[3*i + 0];
			dst[4*i + 2] = src[3*i + 1];
			dst[4*i + 3] = src[3*i + 2];
		#else
			dst[4*i + 0] = src[3*i + 2];
			dst[4*i + 1] = src[3*i + 1];
			dst[4*i + 2] = src[3*i + 0];
			dst[4*i + 3] = 0;
		#endif
	}
}

void rgb16tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
{
	const uint16_t *end;
	uint8_t *d = (uint8_t *)dst;
	const uint16_t *s = (uint16_t *)src;
	end = s + src_size/2;
	while(s < end)
	{
		register uint16_t bgr;
		bgr = *s++;
		#ifdef WORDS_BIGENDIAN
			*d++ = 0;
			*d++ = (bgr&0x1F)<<3;
			*d++ = (bgr&0x7E0)>>3;
			*d++ = (bgr&0xF800)>>8;
		#else
			*d++ = (bgr&0xF800)>>8;
			*d++ = (bgr&0x7E0)>>3;
			*d++ = (bgr&0x1F)<<3;
			*d++ = 0;
		#endif
	}
}

void rgb16tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
{
	const uint16_t *end;
	uint8_t *d = (uint8_t *)dst;
	const uint16_t *s = (const uint16_t *)src;
	end = s + src_size/2;
	while(s < end)
	{
		register uint16_t bgr;
		bgr = *s++;
		*d++ = (bgr&0xF800)>>8;
		*d++ = (bgr&0x7E0)>>3;
		*d++ = (bgr&0x1F)<<3;
	}
}

void rgb16tobgr16(const uint8_t *src, uint8_t *dst, long src_size)
{
	long i;
	long num_pixels = src_size >> 1;
	
	for(i=0; i<num_pixels; i++)
	{
	    unsigned b,g,r;
	    register uint16_t rgb;
	    rgb = src[2*i];
	    r = rgb&0x1F;
	    g = (rgb&0x7E0)>>5;
	    b = (rgb&0xF800)>>11;
	    dst[2*i] = (b&0x1F) | ((g&0x3F)<<5) | ((r&0x1F)<<11);
	}
}

void rgb16tobgr15(const uint8_t *src, uint8_t *dst, long src_size)
{
	long i;
	long num_pixels = src_size >> 1;
	
	for(i=0; i<num_pixels; i++)
	{
	    unsigned b,g,r;
	    register uint16_t rgb;
	    rgb = src[2*i];
	    r = rgb&0x1F;
	    g = (rgb&0x7E0)>>5;
	    b = (rgb&0xF800)>>11;
	    dst[2*i] = (b&0x1F) | ((g&0x1F)<<5) | ((r&0x1F)<<10);
	}
}

void rgb15tobgr32(const uint8_t *src, uint8_t *dst, long src_size)
{
	const uint16_t *end;
	uint8_t *d = (uint8_t *)dst;
	const uint16_t *s = (const uint16_t *)src;
	end = s + src_size/2;
	while(s < end)
	{
		register uint16_t bgr;
		bgr = *s++;
		#ifdef WORDS_BIGENDIAN
			*d++ = 0;
			*d++ = (bgr&0x1F)<<3;
			*d++ = (bgr&0x3E0)>>2;
			*d++ = (bgr&0x7C00)>>7;
		#else
			*d++ = (bgr&0x7C00)>>7;
			*d++ = (bgr&0x3E0)>>2;
			*d++ = (bgr&0x1F)<<3;
			*d++ = 0;
		#endif
	}
}

void rgb15tobgr24(const uint8_t *src, uint8_t *dst, long src_size)
{
	const uint16_t *end;
	uint8_t *d = (uint8_t *)dst;
	const uint16_t *s = (uint16_t *)src;
	end = s + src_size/2;
	while(s < end)
	{
		register uint16_t bgr;
		bgr = *s++;
		*d++ = (bgr&0x7C00)>>7;
		*d++ = (bgr&0x3E0)>>2;
		*d++ = (bgr&0x1F)<<3;
	}
}

void rgb15tobgr16(const uint8_t *src, uint8_t *dst, long src_size)
{
	long i;
	long num_pixels = src_size >> 1;
	
	for(i=0; i<num_pixels; i++)
	{
	    unsigned b,g,r;
	    register uint16_t rgb;
	    rgb = src[2*i];
	    r = rgb&0x1F;
	    g = (rgb&0x3E0)>>5;
	    b = (rgb&0x7C00)>>10;
	    dst[2*i] = (b&0x1F) | ((g&0x3F)<<5) | ((r&0x1F)<<11);
	}
}

void rgb15tobgr15(const uint8_t *src, uint8_t *dst, long src_size)
{
	long i;
	long num_pixels = src_size >> 1;
	
	for(i=0; i<num_pixels; i++)
	{
	    unsigned b,g,r;
	    register uint16_t rgb;
	    rgb = src[2*i];
	    r = rgb&0x1F;
	    g = (rgb&0x3E0)>>5;
	    b = (rgb&0x7C00)>>10;
	    dst[2*i] = (b&0x1F) | ((g&0x1F)<<5) | ((r&0x1F)<<10);
	}
}

void rgb8tobgr8(const uint8_t *src, uint8_t *dst, long src_size)
{
	long i;
	long num_pixels = src_size;
	for(i=0; i<num_pixels; i++)
	{
	    unsigned b,g,r;
	    register uint8_t rgb;
	    rgb = src[i];
	    r = (rgb&0x07);
	    g = (rgb&0x38)>>3;
	    b = (rgb&0xC0)>>6;
	    dst[i] = ((b<<1)&0x07) | ((g&0x07)<<3) | ((r&0x03)<<6);
	}
}