src/video/SDL_blit.h
author Sam Lantinga <slouken@libsdl.org>
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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 __SSE__
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#include <xmmintrin.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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/* The structure passed to the low level blit functions */
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typedef struct
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{
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    Uint8 *s_pixels;
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    int s_width;
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    int s_height;
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    int s_skip;
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    Uint8 *d_pixels;
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    int d_width;
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    int d_height;
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    int d_skip;
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    void *aux_data;
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    SDL_PixelFormat *src;
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    Uint8 *table;
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    SDL_PixelFormat *dst;
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} SDL_BlitInfo;
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/* The type definition for the low level blit functions */
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typedef void (*SDL_loblit) (SDL_BlitInfo * info);
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/* This is the private info structure for software accelerated blits */
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struct private_swaccel
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{
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    SDL_loblit blit;
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    void *aux_data;
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};
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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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    Uint8 *table;
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    SDL_blit sw_blit;
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    struct private_swaccel *sw_data;
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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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#define SDL_BLIT_ANY                0x00000000
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#define SDL_BLIT_MMX                0x00000001
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#define SDL_BLIT_SSE                0x00000002
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#define SDL_BLIT_ALTIVEC_PREFETCH   0x00000004
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#define SDL_BLIT_ALTIVEC_NOPREFETCH 0x00000008
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typedef struct SDL_BlitEntry
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{
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    Uint32 features;
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    SDL_loblit blit;
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} SDL_BlitEntry;
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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_{0,1,N,A}.c */
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extern SDL_loblit SDL_CalculateBlit0(SDL_Surface * surface, int complex);
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extern SDL_loblit SDL_CalculateBlit1(SDL_Surface * surface, int complex);
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extern SDL_loblit SDL_CalculateBlitN(SDL_Surface * surface, int complex);
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extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface * surface, int complex);
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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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   195
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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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   214
}
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   215
#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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   225
									\
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		case 3: {						\
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                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
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   228
			        *((buf)+fmt->Rshift/8) = r;		\
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   229
				*((buf)+fmt->Gshift/8) = g;		\
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   230
				*((buf)+fmt->Bshift/8) = b;		\
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   231
			} else {					\
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   232
			        *((buf)+2-fmt->Rshift/8) = r;		\
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   233
				*((buf)+2-fmt->Gshift/8) = g;		\
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   234
				*((buf)+2-fmt->Bshift/8) = b;		\
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   235
			}						\
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   236
		}							\
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   237
		break;							\
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   238
									\
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   239
		case 4: {						\
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   240
			Uint32 Pixel;					\
0
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   241
									\
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			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
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   243
			*((Uint32 *)(buf)) = Pixel;			\
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   244
		}							\
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   245
		break;							\
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   246
	}								\
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   247
}
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   248
#define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask)		\
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   249
{									\
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   250
	switch (bpp) {							\
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   251
		case 2: {						\
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   252
			Uint16 *bufp;					\
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   253
			Uint16 Pixel;					\
0
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   254
									\
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   255
			bufp = (Uint16 *)buf;				\
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   256
			PIXEL_FROM_RGB(Pixel, fmt, r, g, b);		\
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   257
			*bufp = Pixel | (*bufp & Amask);		\
0
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   258
		}							\
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   259
		break;							\
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   260
									\
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   261
		case 3: {						\
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   262
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
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   263
			        *((buf)+fmt->Rshift/8) = r;		\
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   264
				*((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;					\
0
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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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   285
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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)				\
0
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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;	 	\
0
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   293
}
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#define RGBA_FROM_8888(Pixel, fmt, r, g, b, a)	\
0
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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;	\
0
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   300
}
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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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   305
	b = ((Pixel>>8)&0xFF);						\
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   306
	a = (Pixel&0xFF);						\
0
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   307
}
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   308
#define RGBA_FROM_ARGB8888(Pixel, r, g, b, a)				\
0
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{									\
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   310
	r = ((Pixel>>16)&0xFF);						\
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   311
	g = ((Pixel>>8)&0xFF);						\
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	b = (Pixel&0xFF);						\
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   313
	a = (Pixel>>24);						\
0
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   314
}
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   315
#define RGBA_FROM_ABGR8888(Pixel, r, g, b, a)				\
0
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   316
{									\
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   317
	r = (Pixel&0xFF);						\
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   318
	g = ((Pixel>>8)&0xFF);						\
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   319
	b = ((Pixel>>16)&0xFF);						\
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   320
	a = (Pixel>>24);						\
0
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   321
}
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   322
#define DISEMBLE_RGBA(buf, bpp, fmt, Pixel, r, g, b, a)			   \
0
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   323
do {									   \
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   324
	switch (bpp) {							   \
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   325
		case 2:							   \
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   326
			Pixel = *((Uint16 *)(buf));			   \
0
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   327
		break;							   \
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diff changeset
   328
									   \
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   329
		case 3:	{/* FIXME: broken code (no alpha) */		   \
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   330
		        Uint8 *b = (Uint8 *)buf;			   \
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   331
			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
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   332
			        Pixel = b[0] + (b[1] << 8) + (b[2] << 16); \
0
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diff changeset
   333
			} else {					   \
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   334
			        Pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \
0
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diff changeset
   335
			}						   \
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diff changeset
   336
		}							   \
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diff changeset
   337
		break;							   \
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parents:
diff changeset
   338
									   \
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diff changeset
   339
		case 4:							   \
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   340
			Pixel = *((Uint32 *)(buf));			   \
0
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diff changeset
   341
		break;							   \
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parents:
diff changeset
   342
									   \
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   343
		default:						   \
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   344
		        Pixel = 0; /* stop gcc complaints */		   \
0
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   345
		break;							   \
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   346
	}								   \
1162
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   347
	RGBA_FROM_PIXEL(Pixel, fmt, r, g, b, a);			   \
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   348
	Pixel &= ~fmt->Amask;						   \
0
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diff changeset
   349
} while(0)
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diff changeset
   350
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   351
/* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
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   352
#define PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a)				\
0
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   353
{									\
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   354
	Pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
0
74212992fb08 Initial revision
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   355
		((g>>fmt->Gloss)<<fmt->Gshift)|				\
74212992fb08 Initial revision
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diff changeset
   356
		((b>>fmt->Bloss)<<fmt->Bshift)|				\
535
917cc5c56176 Fixed alpha blending bug (thanks Glenn!)
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   357
		((a>>fmt->Aloss)<<fmt->Ashift);				\
0
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parents:
diff changeset
   358
}
74212992fb08 Initial revision
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diff changeset
   359
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)			\
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diff changeset
   360
{									\
74212992fb08 Initial revision
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parents:
diff changeset
   361
	switch (bpp) {							\
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diff changeset
   362
		case 2: {						\
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   363
			Uint16 Pixel;					\
0
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diff changeset
   364
									\
1162
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   365
			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
2651158f59b8 Enable altivec blitters on PowerPC Linux, and some fixes for recent
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   366
			*((Uint16 *)(buf)) = Pixel;			\
0
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diff changeset
   367
		}							\
74212992fb08 Initial revision
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diff changeset
   368
		break;							\
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parents:
diff changeset
   369
									\
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diff changeset
   370
		case 3: { /* FIXME: broken code (no alpha) */		\
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parents:
diff changeset
   371
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
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parents:
diff changeset
   372
			        *((buf)+fmt->Rshift/8) = r;		\
74212992fb08 Initial revision
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parents:
diff changeset
   373
				*((buf)+fmt->Gshift/8) = g;		\
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parents:
diff changeset
   374
				*((buf)+fmt->Bshift/8) = b;		\
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parents:
diff changeset
   375
			} else {					\
74212992fb08 Initial revision
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parents:
diff changeset
   376
			        *((buf)+2-fmt->Rshift/8) = r;		\
74212992fb08 Initial revision
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parents:
diff changeset
   377
				*((buf)+2-fmt->Gshift/8) = g;		\
74212992fb08 Initial revision
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parents:
diff changeset
   378
				*((buf)+2-fmt->Bshift/8) = b;		\
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parents:
diff changeset
   379
			}						\
74212992fb08 Initial revision
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parents:
diff changeset
   380
		}							\
74212992fb08 Initial revision
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diff changeset
   381
		break;							\
74212992fb08 Initial revision
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parents:
diff changeset
   382
									\
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diff changeset
   383
		case 4: {						\
1162
2651158f59b8 Enable altivec blitters on PowerPC Linux, and some fixes for recent
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diff changeset
   384
			Uint32 Pixel;					\
0
74212992fb08 Initial revision
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diff changeset
   385
									\
1162
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Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   386
			PIXEL_FROM_RGBA(Pixel, fmt, r, g, b, a);	\
2651158f59b8 Enable altivec blitters on PowerPC Linux, and some fixes for recent
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diff changeset
   387
			*((Uint32 *)(buf)) = Pixel;			\
0
74212992fb08 Initial revision
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parents:
diff changeset
   388
		}							\
74212992fb08 Initial revision
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parents:
diff changeset
   389
		break;							\
74212992fb08 Initial revision
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parents:
diff changeset
   390
	}								\
74212992fb08 Initial revision
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parents:
diff changeset
   391
}
74212992fb08 Initial revision
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parents:
diff changeset
   392
1162
2651158f59b8 Enable altivec blitters on PowerPC Linux, and some fixes for recent
Ryan C. Gordon <icculus@icculus.org>
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diff changeset
   393
/* Blend the RGB values of two Pixels based on a source alpha value */
0
74212992fb08 Initial revision
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parents:
diff changeset
   394
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)	\
74212992fb08 Initial revision
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parents:
diff changeset
   395
do {						\
74212992fb08 Initial revision
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parents:
diff changeset
   396
	dR = (((sR-dR)*(A))>>8)+dR;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   397
	dG = (((sG-dG)*(A))>>8)+dG;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   398
	dB = (((sB-dB)*(A))>>8)+dB;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   399
} while(0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
1162
2651158f59b8 Enable altivec blitters on PowerPC Linux, and some fixes for recent
Ryan C. Gordon <icculus@icculus.org>
parents: 1047
diff changeset
   401
/* Blend the RGB values of two Pixels based on a source alpha value */
1047
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   402
#define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB)	\
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   403
do {						\
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   404
    unsigned tR, tG, tB, tA; \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   405
    tA = 255 - sA; \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   406
    tR = 1 + (sR * sA) + (dR * tA); \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   407
    dR = (tR + (tR >> 8)) >> 8; \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   408
    tG = 1 + (sG * sA) + (dG * tA); \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   409
    dG = (tG + (tG >> 8)) >> 8; \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   410
    tB = 1 + (sB * sA) + (dB * tA); \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   411
    dB = (tB + (tB >> 8)) >> 8; \
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   412
} while(0)
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   413
ffaaf7ecf685 Altivec-optimized blitters!
Ryan C. Gordon <icculus@icculus.org>
parents: 769
diff changeset
   414
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   415
/* This is a very useful loop for optimizing blitters */
553
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
Sam Lantinga <slouken@libsdl.org>
parents: 535
diff changeset
   416
#if defined(_MSC_VER) && (_MSC_VER == 1300)
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
Sam Lantinga <slouken@libsdl.org>
parents: 535
diff changeset
   417
/* There's a bug in the Visual C++ 7 optimizer when compiling this code */
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
Sam Lantinga <slouken@libsdl.org>
parents: 535
diff changeset
   418
#else
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   419
#define USE_DUFFS_LOOP
553
417f8709e648 There's a bug in the VC7 optimizer relating to the duff loop optimization
Sam Lantinga <slouken@libsdl.org>
parents: 535
diff changeset
   420
#endif
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   421
#ifdef USE_DUFFS_LOOP
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   422
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   423
/* 8-times unrolled loop */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   424
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   425
{ int n = (width+7)/8;							\
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
   426
	switch (width & 7) {						\
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   427
	case 0: do {	pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   428
	case 7:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   429
	case 6:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   430
	case 5:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   431
	case 4:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   432
	case 3:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   433
	case 2:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   434
	case 1:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   435
		} while ( --n > 0 );					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   436
	}								\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   437
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   438
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   439
/* 4-times unrolled loop */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   440
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   441
{ int n = (width+3)/4;							\
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
   442
	switch (width & 3) {						\
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   443
	case 0: do {	pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   444
	case 3:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   445
	case 2:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   446
	case 1:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   447
		} while ( --n > 0 );					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   448
	}								\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   449
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   450
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   451
/* 2 - times unrolled loop */
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   452
#define DUFFS_LOOP_DOUBLE2(pixel_copy_increment,			\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   453
				double_pixel_copy_increment, width)	\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   454
{ int n, w = width;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   455
	if( w & 1 ) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   456
	    pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   457
	    w--;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   458
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   459
	if ( w > 0 )	{						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   460
	    n = ( w + 2) / 4;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   461
	    switch( w & 2 ) {						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   462
	    case 0: do {	double_pixel_copy_increment;		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   463
	    case 2:		double_pixel_copy_increment;		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   464
		    } while ( --n > 0 );					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   465
	    }								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   466
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   467
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   468
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   469
/* 2 - times unrolled loop 4 pixels */
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   470
#define DUFFS_LOOP_QUATRO2(pixel_copy_increment,			\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   471
				double_pixel_copy_increment,		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   472
				quatro_pixel_copy_increment, width)	\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   473
{ int n, w = width;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   474
        if(w & 1) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   475
	  pixel_copy_increment;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   476
	  w--;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   477
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   478
	if(w & 2) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   479
	  double_pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   480
	  w -= 2;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   481
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   482
	if ( w > 0 ) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   483
	    n = ( w + 7 ) / 8;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   484
	    switch( w & 4 ) {						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   485
	    case 0: do {	quatro_pixel_copy_increment;		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   486
	    case 4:		quatro_pixel_copy_increment;		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   487
		    } while ( --n > 0 );					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   488
	    }								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   489
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   490
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   491
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   492
/* Use the 8-times version of the loop by default */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   493
#define DUFFS_LOOP(pixel_copy_increment, width)				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   494
	DUFFS_LOOP8(pixel_copy_increment, width)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   495
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   496
#else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   497
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   498
/* Don't use Duff's device to unroll loops */
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   499
#define DUFFS_LOOP_DOUBLE2(pixel_copy_increment,			\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   500
			 double_pixel_copy_increment, width)		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   501
{ int n = width;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   502
    if( n & 1 ) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   503
	pixel_copy_increment;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   504
	n--;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   505
    }									\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   506
    n=n>>1;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   507
    for(; n > 0; --n) {   						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   508
	double_pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   509
    }									\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   510
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   511
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   512
/* Don't use Duff's device to unroll loops */
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   513
#define DUFFS_LOOP_QUATRO2(pixel_copy_increment,			\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   514
				double_pixel_copy_increment,		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   515
				quatro_pixel_copy_increment, width)	\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   516
{ int n = width;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   517
        if(n & 1) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   518
	  pixel_copy_increment;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   519
	  n--;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   520
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   521
	if(n & 2) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   522
	  double_pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   523
	  n -= 2;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   524
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   525
	n=n>>2;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   526
	for(; n > 0; --n) {   						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   527
	  quatro_pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
   528
        }								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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   529
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
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parents: 553
diff changeset
   530
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   531
/* Don't use Duff's device to unroll loops */
0
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parents:
diff changeset
   532
#define DUFFS_LOOP(pixel_copy_increment, width)				\
74212992fb08 Initial revision
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parents:
diff changeset
   533
{ int n;								\
74212992fb08 Initial revision
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parents:
diff changeset
   534
	for ( n=width; n > 0; --n ) {					\
74212992fb08 Initial revision
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parents:
diff changeset
   535
		pixel_copy_increment;					\
74212992fb08 Initial revision
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parents:
diff changeset
   536
	}								\
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parents:
diff changeset
   537
}
74212992fb08 Initial revision
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parents:
diff changeset
   538
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
74212992fb08 Initial revision
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parents:
diff changeset
   539
	DUFFS_LOOP(pixel_copy_increment, width)
74212992fb08 Initial revision
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parents:
diff changeset
   540
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   541
	DUFFS_LOOP(pixel_copy_increment, width)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   542
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   543
#endif /* USE_DUFFS_LOOP */
74212992fb08 Initial revision
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parents:
diff changeset
   544
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   545
/* Prevent Visual C++ 6.0 from printing out stupid warnings */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   546
#if defined(_MSC_VER) && (_MSC_VER >= 600)
74212992fb08 Initial revision
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parents:
diff changeset
   547
#pragma warning(disable: 4550)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   548
#endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   549
74212992fb08 Initial revision
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parents:
diff changeset
   550
#endif /* _SDL_blit_h */
1895
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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parents: 1402
diff changeset
   551
/* vi: set ts=4 sw=4 expandtab: */