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view src/video/SDL_blit.h @ 3473:7bdc10624cba

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This is terrible, but the OpenGL standard says that lines are half open, which means that one endpoint is not covered so adjoining lines don't overlap. It also doesn't define which end is open, and indeed Mac OS X and Linux differ. Mac OS X seems to leave the second endpoint open, but Linux uses the right-most endpoint for x major lines and the bottom-most endpoint for y major lines.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 21 Nov 2009 07:14:21 +0000
parents dc2911c207e4
children 83910f4c373f
line wrap: on
line source

/*
    SDL - Simple DirectMedia Layer
    Copyright (C) 1997-2009 Sam Lantinga

    This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library 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
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Sam Lantinga
    slouken@libsdl.org
*/
#include "SDL_config.h"

#ifndef _SDL_blit_h
#define _SDL_blit_h

#ifdef __MMX__
#include <mmintrin.h>
#endif
#ifdef __3dNOW__
#include <mm3dnow.h>
#endif
#ifdef __SSE__
#include <xmmintrin.h>
#endif
#ifdef __SSE2__
#include <emmintrin.h>
#endif

#include "SDL_cpuinfo.h"
#include "SDL_endian.h"
#include "SDL_video.h"

/* SDL blit copy flags */
#define SDL_COPY_MODULATE_COLOR     0x00000001
#define SDL_COPY_MODULATE_ALPHA     0x00000002
#define SDL_COPY_MASK               0x00000010
#define SDL_COPY_BLEND              0x00000020
#define SDL_COPY_ADD                0x00000040
#define SDL_COPY_MOD                0x00000080
#define SDL_COPY_COLORKEY           0x00000100
#define SDL_COPY_NEAREST            0x00000200
#define SDL_COPY_RLE_DESIRED        0x00001000
#define SDL_COPY_RLE_COLORKEY       0x00002000
#define SDL_COPY_RLE_ALPHAKEY       0x00004000
#define SDL_COPY_RLE_MASK           (SDL_COPY_RLE_DESIRED|SDL_COPY_RLE_COLORKEY|SDL_COPY_RLE_ALPHAKEY)

/* SDL blit CPU flags */
#define SDL_CPU_ANY                 0x00000000
#define SDL_CPU_MMX                 0x00000001
#define SDL_CPU_3DNOW               0x00000002
#define SDL_CPU_SSE                 0x00000004
#define SDL_CPU_SSE2                0x00000008
#define SDL_CPU_ALTIVEC_PREFETCH    0x00000010
#define SDL_CPU_ALTIVEC_NOPREFETCH  0x00000020

typedef struct
{
    Uint8 *src;
    int src_w, src_h;
    int src_pitch;
    int src_skip;
    Uint8 *dst;
    int dst_w, dst_h;
    int dst_pitch;
    int dst_skip;
    SDL_PixelFormat *src_fmt;
    SDL_PixelFormat *dst_fmt;
    Uint8 *table;
    int flags;
    Uint32 colorkey;
    Uint8 r, g, b, a;
} SDL_BlitInfo;

typedef void (SDLCALL * SDL_BlitFunc) (SDL_BlitInfo * info);

typedef struct
{
    Uint32 src_format;
    Uint32 dst_format;
    int flags;
    int cpu;
    SDL_BlitFunc func;
} SDL_BlitFuncEntry;

/* Blit mapping definition */
typedef struct SDL_BlitMap
{
    SDL_Surface *dst;
    int identity;
    SDL_blit blit;
    void *data;
    SDL_BlitInfo info;

    /* the version count matches the destination; mismatch indicates
       an invalid mapping */
    unsigned int format_version;
} SDL_BlitMap;

/* Functions found in SDL_blit.c */
extern int SDL_CalculateBlit(SDL_Surface * surface);

/* Functions found in SDL_blit_*.c */
extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface * surface);
extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface * surface);
extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface * surface);
extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface * surface);

/*
 * Useful macros for blitting routines
 */

#if defined(__GNUC__)
#define DECLARE_ALIGNED(t,v,a)  t __attribute__((aligned(a))) v
#elif defined(_MSC_VER)
#define DECLARE_ALIGNED(t,v,a)  __declspec(align(a)) t v
#else
#define DECLARE_ALIGNED(t,v,a)  t v
#endif

#define FORMAT_EQUAL(A, B)						\
    ((A)->BitsPerPixel == (B)->BitsPerPixel				\
     && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))

/* Load pixel of the specified format from a buffer and get its R-G-B values */
/* FIXME: rescale values to 0..255 here? */
#define RGB_FROM_PIXEL(Pixel, fmt, r, g, b)				\
{									\
	r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); 		\
	g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); 		\
	b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); 		\
}
#define RGB_FROM_RGB565(Pixel, r, g, b)					\
{									\
	r = (((Pixel&0xF800)>>11)<<3);		 			\
	g = (((Pixel&0x07E0)>>5)<<2); 					\
	b = ((Pixel&0x001F)<<3); 					\
}
#define RGB_FROM_RGB555(Pixel, r, g, b)					\
{									\
	r = (((Pixel&0x7C00)>>10)<<3);		 			\
	g = (((Pixel&0x03E0)>>5)<<3); 					\
	b = ((Pixel&0x001F)<<3); 					\
}
#define RGB_FROM_RGB888(Pixel, r, g, b)					\
{									\
	r = ((Pixel&0xFF0000)>>16);		 			\
	g = ((Pixel&0xFF00)>>8);		 			\
	b = (Pixel&0xFF);			 			\
}
#define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel)				   \
do {									   \
	switch (bpp) {							   \
		case 2:							   \
			Pixel = *((Uint16 *)(buf));			   \
		break;							   \
									   \
		case 3: {						   \
		        Uint8 *B = (Uint8 *)(buf);			   \
			if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
			        Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
			} else {					   \
			        Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
			}						   \
		}							   \
		break;							   \
									   \
		case 4:							   \
			Pixel = *((Uint32 *)(buf));			   \
		break;							   \
									   \
		default:						   \
		        Pixel; /* stop gcc complaints */		   \
		break;							   \
	}								   \
} while (0)

#define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b)			   \
do {									   \
	switch (bpp) {							   \
		case 2:							   \
			Pixel = *((Uint16 *)(buf));			   \
			RGB_FROM_PIXEL(Pixel, fmt, r, g, b);		   \
		break;							   \
									   \
		case 3:	{						   \
                        if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
			        r = *((buf)+fmt->Rshift/8);		   \
				g = *((buf)+fmt->Gshift/8);		   \
				b = *((buf)+fmt->Bshift/8);		   \
			} else {					   \
			        r = *((buf)+2-fmt->Rshift/8);		   \
				g = *((buf)+2-fmt->Gshift/8);		   \
				b = *((buf)+2-fmt->Bshift/8);		   \
			}						   \
		}							   \
		break;							   \
									   \
		case 4:							   \
			Pixel = *((Uint32 *)(buf));			   \
			RGB_FROM_PIXEL(Pixel, fmt, r, g, b);		   \
		break;							   \
									   \
		default:						   \
		        Pixel; /* stop gcc complaints */		   \
		break;							   \
	}								   \
} while (0)

/* Assemble R-G-B values into a specified pixel format and store them */
#define PIXEL_FROM_RGB(Pixel, fmt, r, g, b)				\
{									\
	Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
		((g>>fmt->Gloss)<<fmt->Gshift)|				\
		((b>>fmt->Bloss)<<fmt->Bshift);				\
}
#define RGB565_FROM_RGB(Pixel, r, g, b)					\
{									\
	Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3);			\
}
#define RGB555_FROM_RGB(Pixel, r, g, b)					\
{									\
	Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3);			\
}
#define RGB888_FROM_RGB(Pixel, r, g, b)					\
{									\
	Pixel = (r<<16)|(g<<8)|b;					\
}
#define ARGB8888_FROM_RGBA(Pixel, r, g, b, a)				\
{									\
	Pixel = (a<<24)|(r<<16)|(g<<8)|b;				\
}
#define RGBA8888_FROM_RGBA(Pixel, r, g, b, a)				\
{									\
	Pixel = (r<<24)|(g<<16)|(b<<8)|a;				\
}
#define ABGR8888_FROM_RGBA(Pixel, r, g, b, a)				\
{									\
	Pixel = (a<<24)|(b<<16)|(g<<8)|r;				\
}
#define BGRA8888_FROM_RGBA(Pixel, r, g, b, a)				\
{									\
	Pixel = (b<<24)|(g<<16)|(r<<8)|a;				\
}
#define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) 				\
{									\
	switch (bpp) {							\
		case 2: {						\
			Uint16 Pixel;					\
									\
			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
			*((Uint16 *)(buf)) = Pixel;			\
		}							\
		break;							\
									\
		case 3: {						\
                        if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
			        *((buf)+fmt->Rshift/8) = r;		\
				*((buf)+fmt->Gshift/8) = g;		\
				*((buf)+fmt->Bshift/8) = b;		\
			} else {					\
			        *((buf)+2-fmt->Rshift/8) = r;		\
				*((buf)+2-fmt->Gshift/8) = g;		\
				*((buf)+2-fmt->Bshift/8) = b;		\
			}						\
		}							\
		break;							\
									\
		case 4: {						\
			Uint32 Pixel;					\
									\
			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
			*((Uint32 *)(buf)) = Pixel;			\
		}							\
		break;							\
	}								\
}
#define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask)		\
{									\
	switch (bpp) {							\
		case 2: {						\
			Uint16 *bufp;					\
			Uint16 Pixel;					\
									\
			bufp = (Uint16 *)buf;				\
			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
			*bufp = Pixel | (*bufp & Amask);		\
		}							\
		break;							\
									\
		case 3: {						\
                        if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
			        *((buf)+fmt->Rshift/8) = r;		\
				*((buf)+fmt->Gshift/8) = g;		\
				*((buf)+fmt->Bshift/8) = b;		\
			} else {					\
			        *((buf)+2-fmt->Rshift/8) = r;		\
				*((buf)+2-fmt->Gshift/8) = g;		\
				*((buf)+2-fmt->Bshift/8) = b;		\
			}						\
		}							\
		break;							\
									\
		case 4: {						\
			Uint32 *bufp;					\
			Uint32 Pixel;					\
									\
			bufp = (Uint32 *)buf;				\
			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
			*bufp = Pixel | (*bufp & Amask);		\
		}							\
		break;							\
	}								\
}

/* FIXME: Should we rescale alpha into 0..255 here? */
#define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a)				\
{									\
	r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; 		\
	g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; 		\
	b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; 		\
	a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss;	 	\
}
#define RGBA_FROM_8888(Pixel, fmt, r, g, b, a)	\
{						\
	r = (Pixel&fmt->Rmask)>>fmt->Rshift;	\
	g = (Pixel&fmt->Gmask)>>fmt->Gshift;	\
	b = (Pixel&fmt->Bmask)>>fmt->Bshift;	\
	a = (Pixel&fmt->Amask)>>fmt->Ashift;	\
}
#define RGBA_FROM_RGBA8888(Pixel, r, g, b, a)				\
{									\
	r = (Pixel>>24);						\
	g = ((Pixel>>16)&0xFF);						\
	b = ((Pixel>>8)&0xFF);						\
	a = (Pixel&0xFF);						\
}
#define RGBA_FROM_ARGB8888(Pixel, r, g, b, a)				\
{									\
	r = ((Pixel>>16)&0xFF);						\
	g = ((Pixel>>8)&0xFF);						\
	b = (Pixel&0xFF);						\
	a = (Pixel>>24);						\
}
#define RGBA_FROM_ABGR8888(Pixel, r, g, b, a)				\
{									\
	r = (Pixel&0xFF);						\
	g = ((Pixel>>8)&0xFF);						\
	b = ((Pixel>>16)&0xFF);						\
	a = (Pixel>>24);						\
}
#define RGBA_FROM_BGRA8888(Pixel, r, g, b, a)				\
{									\
	r = ((Pixel>>8)&0xFF);						\
	g = ((Pixel>>16)&0xFF);						\
	b = (Pixel>>24);						\
	a = (Pixel&0xFF);						\
}
#define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a)			   \
do {									   \
	switch (bpp) {							   \
		case 2:							   \
			Pixel = *((Uint16 *)(buf));			   \
			RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a);	   \
		break;							   \
									   \
		case 3:	{						   \
                        if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
			        r = *((buf)+fmt->Rshift/8);		   \
				g = *((buf)+fmt->Gshift/8);		   \
				b = *((buf)+fmt->Bshift/8);		   \
			} else {					   \
			        r = *((buf)+2-fmt->Rshift/8);		   \
				g = *((buf)+2-fmt->Gshift/8);		   \
				b = *((buf)+2-fmt->Bshift/8);		   \
			}						   \
			a = 0xFF;					   \
		}							   \
		break;							   \
									   \
		case 4:							   \
			Pixel = *((Uint32 *)(buf));			   \
			RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a);	   \
		break;							   \
									   \
		default:						   \
		        Pixel; /* stop gcc complaints */		   \
		break;							   \
	}								   \
} while (0)

/* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
#define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a)				\
{									\
	Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
		((g>>fmt->Gloss)<<fmt->Gshift)|				\
		((b>>fmt->Bloss)<<fmt->Bshift)|				\
		((a>>fmt->Aloss)<<fmt->Ashift);				\
}
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)			\
{									\
	switch (bpp) {							\
		case 2: {						\
			Uint16 Pixel;					\
									\
			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
			*((Uint16 *)(buf)) = Pixel;			\
		}							\
		break;							\
									\
		case 3: {						\
                        if (SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
			        *((buf)+fmt->Rshift/8) = r;		\
				*((buf)+fmt->Gshift/8) = g;		\
				*((buf)+fmt->Bshift/8) = b;		\
			} else {					\
			        *((buf)+2-fmt->Rshift/8) = r;		\
				*((buf)+2-fmt->Gshift/8) = g;		\
				*((buf)+2-fmt->Bshift/8) = b;		\
			}						\
		}							\
		break;							\
									\
		case 4: {						\
			Uint32 Pixel;					\
									\
			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
			*((Uint32 *)(buf)) = Pixel;			\
		}							\
		break;							\
	}								\
}

/* Blend the RGB values of two Pixels based on a source alpha value */
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)	\
do {						\
	dR = ((((int)(sR-dR)*(int)A)/255)+dR);	\
	dG = ((((int)(sG-dG)*(int)A)/255)+dG);	\
	dB = ((((int)(sB-dB)*(int)A)/255)+dB);	\
} while(0)


/* This is a very useful loop for optimizing blitters */
#if defined(_MSC_VER) && (_MSC_VER == 1300)
/* There's a bug in the Visual C++ 7 optimizer when compiling this code */
#else
#define USE_DUFFS_LOOP
#endif
#ifdef USE_DUFFS_LOOP

/* 8-times unrolled loop */
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
{ int n = (width+7)/8;							\
	switch (width & 7) {						\
	case 0: do {	pixel_copy_increment;				\
	case 7:		pixel_copy_increment;				\
	case 6:		pixel_copy_increment;				\
	case 5:		pixel_copy_increment;				\
	case 4:		pixel_copy_increment;				\
	case 3:		pixel_copy_increment;				\
	case 2:		pixel_copy_increment;				\
	case 1:		pixel_copy_increment;				\
		} while ( --n > 0 );					\
	}								\
}

/* 4-times unrolled loop */
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
{ int n = (width+3)/4;							\
	switch (width & 3) {						\
	case 0: do {	pixel_copy_increment;				\
	case 3:		pixel_copy_increment;				\
	case 2:		pixel_copy_increment;				\
	case 1:		pixel_copy_increment;				\
		} while (--n > 0);					\
	}								\
}

/* Use the 8-times version of the loop by default */
#define DUFFS_LOOP(pixel_copy_increment, width)				\
	DUFFS_LOOP8(pixel_copy_increment, width)

/* Special version of Duff's device for even more optimization */
#define DUFFS_LOOP_124(pixel_copy_increment1,				\
                       pixel_copy_increment2,				\
                       pixel_copy_increment4, width)			\
{ int n = width;							\
	if (n & 1) {							\
		pixel_copy_increment1; n -= 1;				\
	}								\
	if (n & 2) {							\
		pixel_copy_increment2; n -= 2;				\
	}								\
	if (n) {							\
		n = (n+7)/ 8;						\
		switch (n & 4) {					\
		case 0: do {	pixel_copy_increment4;			\
		case 4:		pixel_copy_increment4;			\
			} while (--n > 0);				\
		}							\
	}								\
}

#else

/* Don't use Duff's device to unroll loops */
#define DUFFS_LOOP(pixel_copy_increment, width)				\
{ int n;								\
	for ( n=width; n > 0; --n ) {					\
		pixel_copy_increment;					\
	}								\
}
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
	DUFFS_LOOP(pixel_copy_increment, width)
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
	DUFFS_LOOP(pixel_copy_increment, width)
#define DUFFS_LOOP_124(pixel_copy_increment1,				\
                       pixel_copy_increment2,				\
                       pixel_copy_increment4, width)			\
	DUFFS_LOOP(pixel_copy_increment1, width)

#endif /* USE_DUFFS_LOOP */

/* Prevent Visual C++ 6.0 from printing out stupid warnings */
#if defined(_MSC_VER) && (_MSC_VER >= 600)
#pragma warning(disable: 4550)
#endif

#endif /* _SDL_blit_h */

/* vi: set ts=4 sw=4 expandtab: */