src/video/SDL_blit.h
author Sam Lantinga <slouken@libsdl.org>
Sat, 18 Aug 2007 05:39:09 +0000
changeset 2267 c785543d1843
parent 2266 e61ad15a205f
child 2824 4dba7aa7ea77
permissions -rw-r--r--
Okay, still some bugs, but everything builds again...
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997-2006 Sam Lantinga
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    This library is free software; you can redistribute it and/or
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    modify it under the terms of the GNU Lesser General Public
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    License as published by the Free Software Foundation; either
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    version 2.1 of the License, or (at your option) any later version.
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    This library is distributed in the hope that it will be useful,
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    but WITHOUT ANY WARRANTY; without even the implied warranty of
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    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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    Lesser General Public License for more details.
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    You should have received a copy of the GNU Lesser General Public
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    License along with this library; if not, write to the Free Software
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    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#include "SDL_config.h"
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#ifndef _SDL_blit_h
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#define _SDL_blit_h
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#ifdef __MMX__
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#include <mmintrin.h>
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#endif
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#ifdef __3dNOW__
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#include <mm3dnow.h>
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#endif
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#ifdef __SSE__
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#include <xmmintrin.h>
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#endif
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#ifdef __SSE2__
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#include <emmintrin.h>
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#endif
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#include "SDL_cpuinfo.h"
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#include "SDL_endian.h"
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/* SDL blit copy flags */
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#define SDL_COPY_MODULATE_COLOR     0x00000001
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#define SDL_COPY_MODULATE_ALPHA     0x00000002
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#define SDL_COPY_MASK               0x00000010
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#define SDL_COPY_BLEND              0x00000020
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#define SDL_COPY_ADD                0x00000040
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#define SDL_COPY_MOD                0x00000080
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#define SDL_COPY_COLORKEY           0x00000100
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#define SDL_COPY_NEAREST            0x00000200
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#define SDL_COPY_RLE_DESIRED        0x00001000
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#define SDL_COPY_RLE_COLORKEY       0x00002000
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#define SDL_COPY_RLE_ALPHAKEY       0x00004000
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/* SDL blit CPU flags */
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#define SDL_CPU_ANY                 0x00000000
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#define SDL_CPU_MMX                 0x00000001
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#define SDL_CPU_3DNOW               0x00000002
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#define SDL_CPU_SSE                 0x00000004
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#define SDL_CPU_SSE2                0x00000008
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#define SDL_CPU_ALTIVEC_PREFETCH    0x00000010
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#define SDL_CPU_ALTIVEC_NOPREFETCH  0x00000020
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typedef struct
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{
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    Uint8 *src;
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    int src_w, src_h;
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    int src_pitch;
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    int src_skip;
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    Uint8 *dst;
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    int dst_w, dst_h;
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    int dst_pitch;
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    int dst_skip;
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    SDL_PixelFormat *src_fmt;
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    SDL_PixelFormat *dst_fmt;
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    Uint8 *table;
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    int flags;
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    Uint32 colorkey;
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    Uint8 r, g, b, a;
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} SDL_BlitInfo;
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typedef void (SDLCALL * SDL_BlitFunc) (SDL_BlitInfo * info);
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typedef struct
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{
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    Uint32 src_format;
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    Uint32 dst_format;
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    int flags;
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    int cpu;
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    SDL_BlitFunc func;
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} SDL_BlitFuncEntry;
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/* Blit mapping definition */
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typedef struct SDL_BlitMap
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{
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    SDL_Surface *dst;
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    int identity;
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    SDL_blit blit;
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    void *data;
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    SDL_BlitInfo info;
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    /* the version count matches the destination; mismatch indicates
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       an invalid mapping */
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    unsigned int format_version;
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} SDL_BlitMap;
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/* Functions found in SDL_blit.c */
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extern int SDL_CalculateBlit(SDL_Surface * surface);
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/* Functions found in SDL_blit_*.c */
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extern SDL_BlitFunc SDL_CalculateBlit0(SDL_Surface * surface);
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extern SDL_BlitFunc SDL_CalculateBlit1(SDL_Surface * surface);
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extern SDL_BlitFunc SDL_CalculateBlitN(SDL_Surface * surface);
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extern SDL_BlitFunc SDL_CalculateBlitA(SDL_Surface * surface);
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/*
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 * Useful macros for blitting routines
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 */
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#if defined(__GNUC__)
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#define DECLARE_ALIGNED(t,v,a)  t __attribute__((aligned(a))) v
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#elif defined(_MSC_VER)
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#define DECLARE_ALIGNED(t,v,a)  __declspec(align(a)) t v
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#else
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#define DECLARE_ALIGNED(t,v,a)  t v
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#endif
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#define FORMAT_EQUAL(A, B)						\
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    ((A)->BitsPerPixel == (B)->BitsPerPixel				\
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     && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))
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/* Load pixel of the specified format from a buffer and get its R-G-B values */
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/* FIXME: rescale values to 0..255 here? */
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#define RGB_FROM_PIXEL(Pixel, fmt, r, g, b)				\
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{									\
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	r = (((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss); 		\
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	g = (((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss); 		\
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	b = (((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss); 		\
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}
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#define RGB_FROM_RGB565(Pixel, r, g, b)					\
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{									\
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	r = (((Pixel&0xF800)>>11)<<3);		 			\
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	g = (((Pixel&0x07E0)>>5)<<2); 					\
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	b = ((Pixel&0x001F)<<3); 					\
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}
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#define RGB_FROM_RGB555(Pixel, r, g, b)					\
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{									\
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	r = (((Pixel&0x7C00)>>10)<<3);		 			\
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	g = (((Pixel&0x03E0)>>5)<<3); 					\
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	b = ((Pixel&0x001F)<<3); 					\
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}
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#define RGB_FROM_RGB888(Pixel, r, g, b)					\
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{									\
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	r = ((Pixel&0xFF0000)>>16);		 			\
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	g = ((Pixel&0xFF00)>>8);		 			\
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	b = (Pixel&0xFF);			 			\
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}
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#define RETRIEVE_RGB_PIXEL(buf, bpp, Pixel)				   \
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do {									   \
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	switch (bpp) {							   \
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		case 2:							   \
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			Pixel = *((Uint16 *)(buf));			   \
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		break;							   \
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									   \
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		case 3: {						   \
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		        Uint8 *B = (Uint8 *)(buf);			   \
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			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
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			        Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
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			} else {					   \
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			        Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
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			}						   \
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		}							   \
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		break;							   \
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									   \
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		case 4:							   \
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			Pixel = *((Uint32 *)(buf));			   \
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		break;							   \
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									   \
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		default:						   \
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			Pixel = 0; /* appease gcc */			   \
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		break;							   \
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	}								   \
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} while(0)
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#define DISEMBLE_RGB(buf, bpp, fmt, Pixel, r, g, b)			   \
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do {									   \
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	switch (bpp) {							   \
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		case 2:							   \
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			Pixel = *((Uint16 *)(buf));			   \
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		break;							   \
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									   \
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		case 3: {						   \
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		        Uint8 *B = (Uint8 *)buf;			   \
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			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
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			        Pixel = B[0] + (B[1] << 8) + (B[2] << 16); \
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			} else {					   \
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			        Pixel = (B[0] << 16) + (B[1] << 8) + B[2]; \
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			}						   \
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		}							   \
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		break;							   \
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									   \
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		case 4:							   \
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			Pixel = *((Uint32 *)(buf));			   \
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		break;							   \
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									   \
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	        default:						   \
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		        Pixel = 0;	/* prevent gcc from complaining */ \
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		break;							   \
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	}								   \
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	RGB_FROM_PIXEL(Pixel, fmt, r, g, b);				   \
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} while(0)
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/* Assemble R-G-B values into a specified pixel format and store them */
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#define PIXEL_FROM_RGB(Pixel, fmt, r, g, b)				\
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{									\
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	Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
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		((g>>fmt->Gloss)<<fmt->Gshift)|				\
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		((b>>fmt->Bloss)<<fmt->Bshift);				\
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}
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#define RGB565_FROM_RGB(Pixel, r, g, b)					\
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{									\
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	Pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3);			\
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}
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#define RGB555_FROM_RGB(Pixel, r, g, b)					\
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{									\
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	Pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3);			\
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}
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#define RGB888_FROM_RGB(Pixel, r, g, b)					\
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{									\
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	Pixel = (r<<16)|(g<<8)|b;					\
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}
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#define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b) 				\
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{									\
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	switch (bpp) {							\
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		case 2: {						\
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			Uint16 Pixel;					\
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									\
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			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
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			*((Uint16 *)(buf)) = Pixel;			\
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		}							\
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		break;							\
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									\
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		case 3: {						\
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                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
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			        *((buf)+fmt->Rshift/8) = r;		\
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				*((buf)+fmt->Gshift/8) = g;		\
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				*((buf)+fmt->Bshift/8) = b;		\
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			} else {					\
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			        *((buf)+2-fmt->Rshift/8) = r;		\
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				*((buf)+2-fmt->Gshift/8) = g;		\
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				*((buf)+2-fmt->Bshift/8) = b;		\
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			}						\
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		}							\
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		break;							\
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									\
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		case 4: {						\
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			Uint32 Pixel;					\
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									\
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			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
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			*((Uint32 *)(buf)) = Pixel;			\
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		}							\
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		break;							\
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	}								\
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}
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#define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask)		\
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{									\
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	switch (bpp) {							\
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		case 2: {						\
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			Uint16 *bufp;					\
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			Uint16 Pixel;					\
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									\
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			bufp = (Uint16 *)buf;				\
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			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
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			*bufp = Pixel | (*bufp & Amask);		\
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		}							\
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		break;							\
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									\
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		case 3: {						\
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                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
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			        *((buf)+fmt->Rshift/8) = r;		\
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				*((buf)+fmt->Gshift/8) = g;		\
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				*((buf)+fmt->Bshift/8) = b;		\
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			} else {					\
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			        *((buf)+2-fmt->Rshift/8) = r;		\
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				*((buf)+2-fmt->Gshift/8) = g;		\
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				*((buf)+2-fmt->Bshift/8) = b;		\
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			}						\
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		}							\
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		break;							\
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									\
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		case 4: {						\
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			Uint32 *bufp;					\
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			Uint32 Pixel;					\
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									\
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			bufp = (Uint32 *)buf;				\
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			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
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			*bufp = Pixel | (*bufp & Amask);		\
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		}							\
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		break;							\
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	}								\
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}
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/* FIXME: Should we rescale alpha into 0..255 here? */
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#define RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a)				\
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{									\
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	r = ((Pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; 		\
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	g = ((Pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; 		\
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	b = ((Pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; 		\
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	a = ((Pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss;	 	\
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}
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#define RGBA_FROM_8888(Pixel, fmt, r, g, b, a)	\
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{						\
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	r = (Pixel&fmt->Rmask)>>fmt->Rshift;	\
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	g = (Pixel&fmt->Gmask)>>fmt->Gshift;	\
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	b = (Pixel&fmt->Bmask)>>fmt->Bshift;	\
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	a = (Pixel&fmt->Amask)>>fmt->Ashift;	\
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}
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#define RGBA_FROM_RGBA8888(Pixel, r, g, b, a)				\
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{									\
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	r = (Pixel>>24);						\
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	g = ((Pixel>>16)&0xFF);						\
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	b = ((Pixel>>8)&0xFF);						\
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	a = (Pixel&0xFF);						\
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}
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#define RGBA_FROM_ARGB8888(Pixel, r, g, b, a)				\
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{									\
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	r = ((Pixel>>16)&0xFF);						\
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	g = ((Pixel>>8)&0xFF);						\
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	b = (Pixel&0xFF);						\
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	a = (Pixel>>24);						\
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}
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#define RGBA_FROM_ABGR8888(Pixel, r, g, b, a)				\
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{									\
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	r = (Pixel&0xFF);						\
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	g = ((Pixel>>8)&0xFF);						\
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	b = ((Pixel>>16)&0xFF);						\
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	a = (Pixel>>24);						\
slouken@0
   339
}
icculus@1162
   340
#define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a)			   \
slouken@0
   341
do {									   \
slouken@0
   342
	switch (bpp) {							   \
slouken@0
   343
		case 2:							   \
icculus@1162
   344
			Pixel = *((Uint16 *)(buf));			   \
slouken@0
   345
		break;							   \
slouken@0
   346
									   \
slouken@0
   347
		case 3:	{/* FIXME: broken code (no alpha) */		   \
slouken@0
   348
		        Uint8 *b = (Uint8 *)buf;			   \
slouken@0
   349
			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
icculus@1162
   350
			        Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \
slouken@0
   351
			} else {					   \
icculus@1162
   352
			        Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \
slouken@0
   353
			}						   \
slouken@0
   354
		}							   \
slouken@0
   355
		break;							   \
slouken@0
   356
									   \
slouken@0
   357
		case 4:							   \
icculus@1162
   358
			Pixel = *((Uint32 *)(buf));			   \
slouken@0
   359
		break;							   \
slouken@0
   360
									   \
slouken@0
   361
		default:						   \
icculus@1162
   362
		        Pixel = 0; /* stop gcc complaints */		   \
slouken@0
   363
		break;							   \
slouken@0
   364
	}								   \
icculus@1162
   365
	RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a);			   \
icculus@1162
   366
	Pixel &= ~fmt->Amask;						   \
slouken@0
   367
} while(0)
slouken@0
   368
slouken@0
   369
/* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
icculus@1162
   370
#define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a)				\
slouken@0
   371
{									\
icculus@1162
   372
	Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
slouken@0
   373
		((g>>fmt->Gloss)<<fmt->Gshift)|				\
slouken@0
   374
		((b>>fmt->Bloss)<<fmt->Bshift)|				\
slouken@535
   375
		((a>>fmt->Aloss)<<fmt->Ashift);				\
slouken@0
   376
}
slouken@0
   377
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)			\
slouken@0
   378
{									\
slouken@0
   379
	switch (bpp) {							\
slouken@0
   380
		case 2: {						\
icculus@1162
   381
			Uint16 Pixel;					\
slouken@0
   382
									\
icculus@1162
   383
			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
icculus@1162
   384
			*((Uint16 *)(buf)) = Pixel;			\
slouken@0
   385
		}							\
slouken@0
   386
		break;							\
slouken@0
   387
									\
slouken@0
   388
		case 3: { /* FIXME: broken code (no alpha) */		\
slouken@0
   389
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
slouken@0
   390
			        *((buf)+fmt->Rshift/8) = r;		\
slouken@0
   391
				*((buf)+fmt->Gshift/8) = g;		\
slouken@0
   392
				*((buf)+fmt->Bshift/8) = b;		\
slouken@0
   393
			} else {					\
slouken@0
   394
			        *((buf)+2-fmt->Rshift/8) = r;		\
slouken@0
   395
				*((buf)+2-fmt->Gshift/8) = g;		\
slouken@0
   396
				*((buf)+2-fmt->Bshift/8) = b;		\
slouken@0
   397
			}						\
slouken@0
   398
		}							\
slouken@0
   399
		break;							\
slouken@0
   400
									\
slouken@0
   401
		case 4: {						\
icculus@1162
   402
			Uint32 Pixel;					\
slouken@0
   403
									\
icculus@1162
   404
			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
icculus@1162
   405
			*((Uint32 *)(buf)) = Pixel;			\
slouken@0
   406
		}							\
slouken@0
   407
		break;							\
slouken@0
   408
	}								\
slouken@0
   409
}
slouken@0
   410
icculus@1162
   411
/* Blend the RGB values of two Pixels based on a source alpha value */
slouken@0
   412
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)	\
slouken@0
   413
do {						\
slouken@0
   414
	dR = (((sR-dR)*(A))>>8)+dR;		\
slouken@0
   415
	dG = (((sG-dG)*(A))>>8)+dG;		\
slouken@0
   416
	dB = (((sB-dB)*(A))>>8)+dB;		\
slouken@0
   417
} while(0)
slouken@0
   418
icculus@1162
   419
/* Blend the RGB values of two Pixels based on a source alpha value */
icculus@1047
   420
#define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB)	\
icculus@1047
   421
do {						\
icculus@1047
   422
    unsigned tR, tG, tB, tA; \
icculus@1047
   423
    tA = 255 - sA; \
icculus@1047
   424
    tR = 1 + (sR * sA) + (dR * tA); \
icculus@1047
   425
    dR = (tR + (tR >> 8)) >> 8; \
icculus@1047
   426
    tG = 1 + (sG * sA) + (dG * tA); \
icculus@1047
   427
    dG = (tG + (tG >> 8)) >> 8; \
icculus@1047
   428
    tB = 1 + (sB * sA) + (dB * tA); \
icculus@1047
   429
    dB = (tB + (tB >> 8)) >> 8; \
icculus@1047
   430
} while(0)
icculus@1047
   431
icculus@1047
   432
slouken@0
   433
/* This is a very useful loop for optimizing blitters */
slouken@553
   434
#if defined(_MSC_VER) && (_MSC_VER == 1300)
slouken@553
   435
/* There's a bug in the Visual C++ 7 optimizer when compiling this code */
slouken@553
   436
#else
slouken@0
   437
#define USE_DUFFS_LOOP
slouken@553
   438
#endif
slouken@0
   439
#ifdef USE_DUFFS_LOOP
slouken@0
   440
slouken@0
   441
/* 8-times unrolled loop */
slouken@0
   442
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
slouken@0
   443
{ int n = (width+7)/8;							\
slouken@91
   444
	switch (width & 7) {						\
slouken@0
   445
	case 0: do {	pixel_copy_increment;				\
slouken@0
   446
	case 7:		pixel_copy_increment;				\
slouken@0
   447
	case 6:		pixel_copy_increment;				\
slouken@0
   448
	case 5:		pixel_copy_increment;				\
slouken@0
   449
	case 4:		pixel_copy_increment;				\
slouken@0
   450
	case 3:		pixel_copy_increment;				\
slouken@0
   451
	case 2:		pixel_copy_increment;				\
slouken@0
   452
	case 1:		pixel_copy_increment;				\
slouken@0
   453
		} while ( --n > 0 );					\
slouken@0
   454
	}								\
slouken@0
   455
}
slouken@0
   456
slouken@0
   457
/* 4-times unrolled loop */
slouken@0
   458
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
slouken@0
   459
{ int n = (width+3)/4;							\
slouken@91
   460
	switch (width & 3) {						\
slouken@0
   461
	case 0: do {	pixel_copy_increment;				\
slouken@0
   462
	case 3:		pixel_copy_increment;				\
slouken@0
   463
	case 2:		pixel_copy_increment;				\
slouken@0
   464
	case 1:		pixel_copy_increment;				\
slouken@0
   465
		} while ( --n > 0 );					\
slouken@0
   466
	}								\
slouken@0
   467
}
slouken@0
   468
slouken@689
   469
/* 2 - times unrolled loop */
slouken@689
   470
#define DUFFS_LOOP_DOUBLE2(pixel_copy_increment,			\
slouken@689
   471
				double_pixel_copy_increment, width)	\
slouken@689
   472
{ int n, w = width;							\
slouken@689
   473
	if( w & 1 ) {							\
slouken@689
   474
	    pixel_copy_increment;					\
slouken@689
   475
	    w--;							\
slouken@689
   476
	}								\
slouken@689
   477
	if ( w > 0 )	{						\
slouken@689
   478
	    n = ( w + 2) / 4;						\
slouken@689
   479
	    switch( w & 2 ) {						\
slouken@689
   480
	    case 0: do {	double_pixel_copy_increment;		\
slouken@689
   481
	    case 2:		double_pixel_copy_increment;		\
slouken@689
   482
		    } while ( --n > 0 );					\
slouken@689
   483
	    }								\
slouken@689
   484
	}								\
slouken@689
   485
}
slouken@689
   486
slouken@689
   487
/* 2 - times unrolled loop 4 pixels */
slouken@689
   488
#define DUFFS_LOOP_QUATRO2(pixel_copy_increment,			\
slouken@689
   489
				double_pixel_copy_increment,		\
slouken@689
   490
				quatro_pixel_copy_increment, width)	\
slouken@689
   491
{ int n, w = width;								\
slouken@689
   492
        if(w & 1) {							\
slouken@689
   493
	  pixel_copy_increment;						\
slouken@689
   494
	  w--;								\
slouken@689
   495
	}								\
slouken@689
   496
	if(w & 2) {							\
slouken@689
   497
	  double_pixel_copy_increment;					\
slouken@689
   498
	  w -= 2;							\
slouken@689
   499
	}								\
slouken@689
   500
	if ( w > 0 ) {							\
slouken@689
   501
	    n = ( w + 7 ) / 8;						\
slouken@689
   502
	    switch( w & 4 ) {						\
slouken@689
   503
	    case 0: do {	quatro_pixel_copy_increment;		\
slouken@689
   504
	    case 4:		quatro_pixel_copy_increment;		\
slouken@689
   505
		    } while ( --n > 0 );					\
slouken@689
   506
	    }								\
slouken@689
   507
	}								\
slouken@689
   508
}
slouken@689
   509
slouken@0
   510
/* Use the 8-times version of the loop by default */
slouken@0
   511
#define DUFFS_LOOP(pixel_copy_increment, width)				\
slouken@0
   512
	DUFFS_LOOP8(pixel_copy_increment, width)
slouken@0
   513
slouken@0
   514
#else
slouken@0
   515
slouken@0
   516
/* Don't use Duff's device to unroll loops */
slouken@689
   517
#define DUFFS_LOOP_DOUBLE2(pixel_copy_increment,			\
slouken@689
   518
			 double_pixel_copy_increment, width)		\
slouken@689
   519
{ int n = width;								\
slouken@689
   520
    if( n & 1 ) {							\
slouken@689
   521
	pixel_copy_increment;						\
slouken@689
   522
	n--;								\
slouken@689
   523
    }									\
slouken@689
   524
    n=n>>1;								\
slouken@689
   525
    for(; n > 0; --n) {   						\
slouken@689
   526
	double_pixel_copy_increment;					\
slouken@689
   527
    }									\
slouken@689
   528
}
slouken@689
   529
slouken@689
   530
/* Don't use Duff's device to unroll loops */
slouken@689
   531
#define DUFFS_LOOP_QUATRO2(pixel_copy_increment,			\
slouken@689
   532
				double_pixel_copy_increment,		\
slouken@689
   533
				quatro_pixel_copy_increment, width)	\
slouken@689
   534
{ int n = width;								\
slouken@689
   535
        if(n & 1) {							\
slouken@689
   536
	  pixel_copy_increment;						\
slouken@689
   537
	  n--;								\
slouken@689
   538
	}								\
slouken@689
   539
	if(n & 2) {							\
slouken@689
   540
	  double_pixel_copy_increment;					\
slouken@689
   541
	  n -= 2;							\
slouken@689
   542
	}								\
slouken@689
   543
	n=n>>2;								\
slouken@689
   544
	for(; n > 0; --n) {   						\
slouken@689
   545
	  quatro_pixel_copy_increment;					\
slouken@689
   546
        }								\
slouken@689
   547
}
slouken@689
   548
slouken@689
   549
/* Don't use Duff's device to unroll loops */
slouken@0
   550
#define DUFFS_LOOP(pixel_copy_increment, width)				\
slouken@0
   551
{ int n;								\
slouken@0
   552
	for ( n=width; n > 0; --n ) {					\
slouken@0
   553
		pixel_copy_increment;					\
slouken@0
   554
	}								\
slouken@0
   555
}
slouken@0
   556
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
slouken@0
   557
	DUFFS_LOOP(pixel_copy_increment, width)
slouken@0
   558
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
slouken@0
   559
	DUFFS_LOOP(pixel_copy_increment, width)
slouken@0
   560
slouken@0
   561
#endif /* USE_DUFFS_LOOP */
slouken@0
   562
slouken@0
   563
/* Prevent Visual C++ 6.0 from printing out stupid warnings */
slouken@0
   564
#if defined(_MSC_VER) && (_MSC_VER >= 600)
slouken@0
   565
#pragma warning(disable: 4550)
slouken@0
   566
#endif
slouken@0
   567
slouken@0
   568
#endif /* _SDL_blit_h */
slouken@1895
   569
/* vi: set ts=4 sw=4 expandtab: */