src/video/SDL_blit.h
author Sam Lantinga <slouken@libsdl.org>
Fri, 22 Aug 2003 05:51:19 +0000
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Date: Tue, 19 Aug 2003 17:57:00 +0200 From: Stephane Marchesin Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection I think everything is correct now. I've done as much testing as I could, but some real-world testing wouldn't hurt, I think. The patch is here : http://icps.u-strasbg.fr/~marchesin/sdl_mmxblit.patch If you do byte-by-byte comparison of the output between C and MMX functions, you'll notice that the results for 555 and 565 RGB alpha blits aren't exactly the same. This is because MMX functions for 555 and 565 RGB have an higher accuracy. If you want the exact same behaviour that's possible by masking the three lower alpha bits in the MMX functions. Just ask ! I removed one MMX function because after I fixed it to match its C equivalent, it revealed to be slower than the C version on a PIII (although a bit faster on an Athlon XP). I've also added MMX and PIII replacements for SDL_memcpy. Those provide some speed up in testvidinfo -benchmark (at least for me, under linux & X11).
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/*
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    SDL - Simple DirectMedia Layer
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    Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002  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 Library General Public
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    License as published by the Free Software Foundation; either
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    version 2 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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    Library General Public License for more details.
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    You should have received a copy of the GNU Library General Public
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    License along with this library; if not, write to the Free
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    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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    Sam Lantinga
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    slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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 "@(#) $Id$";
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#endif
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#ifndef _SDL_blit_h
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#define _SDL_blit_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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	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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	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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	SDL_Surface *dst;
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	int identity;
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	Uint8 *table;
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	SDL_blit hw_blit;
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	SDL_blit sw_blit;
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	struct private_hwaccel *hw_data;
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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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/* 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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#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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   196
									\
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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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   201
									\
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   202
		case 3: {						\
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   203
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
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   204
			        *((buf)+fmt->Rshift/8) = r;		\
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   205
				*((buf)+fmt->Gshift/8) = g;		\
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   206
				*((buf)+fmt->Bshift/8) = b;		\
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   207
			} else {					\
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   208
			        *((buf)+2-fmt->Rshift/8) = r;		\
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   209
				*((buf)+2-fmt->Gshift/8) = g;		\
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   210
				*((buf)+2-fmt->Bshift/8) = b;		\
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   211
			}						\
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   212
		}							\
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   213
		break;							\
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   214
									\
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   215
		case 4: {						\
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   216
			Uint32 pixel;					\
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   217
									\
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   218
			PIXEL_FROM_RGB(pixel, fmt, r, g, b);		\
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   219
			*((Uint32 *)(buf)) = pixel;			\
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   220
		}							\
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   221
		break;							\
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   222
	}								\
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   223
}
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   224
#define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask)		\
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   225
{									\
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   226
	switch (bpp) {							\
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   227
		case 2: {						\
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   228
			Uint16 *bufp;					\
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   229
			Uint16 pixel;					\
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   230
									\
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   231
			bufp = (Uint16 *)buf;				\
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   232
			PIXEL_FROM_RGB(pixel, fmt, r, g, b);		\
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   233
			*bufp = pixel | (*bufp & Amask);		\
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   234
		}							\
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   235
		break;							\
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diff changeset
   236
									\
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   237
		case 3: {						\
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   238
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
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   239
			        *((buf)+fmt->Rshift/8) = r;		\
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   240
				*((buf)+fmt->Gshift/8) = g;		\
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   241
				*((buf)+fmt->Bshift/8) = b;		\
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   242
			} else {					\
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   243
			        *((buf)+2-fmt->Rshift/8) = r;		\
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parents:
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   244
				*((buf)+2-fmt->Gshift/8) = g;		\
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parents:
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   245
				*((buf)+2-fmt->Bshift/8) = b;		\
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diff changeset
   246
			}						\
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diff changeset
   247
		}							\
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   248
		break;							\
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   249
									\
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   250
		case 4: {						\
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   251
			Uint32 *bufp;					\
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   252
			Uint32 pixel;					\
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   253
									\
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   254
			bufp = (Uint32 *)buf;				\
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   255
			PIXEL_FROM_RGB(pixel, fmt, r, g, b);		\
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   256
			*bufp = pixel | (*bufp & Amask);		\
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diff changeset
   257
		}							\
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   258
		break;							\
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diff changeset
   259
	}								\
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   260
}
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   261
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   262
/* FIXME: Should we rescale alpha into 0..255 here? */
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   263
#define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a)				\
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   264
{									\
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   265
	r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; 		\
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   266
	g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; 		\
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   267
	b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; 		\
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   268
	a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss;	 	\
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diff changeset
   269
}
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   270
#define RGBA_FROM_8888(pixel, fmt, r, g, b, a)	\
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   271
{						\
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parents:
diff changeset
   272
	r = (pixel&fmt->Rmask)>>fmt->Rshift;	\
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diff changeset
   273
	g = (pixel&fmt->Gmask)>>fmt->Gshift;	\
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parents:
diff changeset
   274
	b = (pixel&fmt->Bmask)>>fmt->Bshift;	\
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   275
	a = (pixel&fmt->Amask)>>fmt->Ashift;	\
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diff changeset
   276
}
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   277
#define RGBA_FROM_RGBA8888(pixel, r, g, b, a)				\
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   278
{									\
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diff changeset
   279
	r = (pixel>>24);						\
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   280
	g = ((pixel>>16)&0xFF);						\
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diff changeset
   281
	b = ((pixel>>8)&0xFF);						\
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diff changeset
   282
	a = (pixel&0xFF);						\
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diff changeset
   283
}
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   284
#define RGBA_FROM_ARGB8888(pixel, r, g, b, a)				\
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   285
{									\
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diff changeset
   286
	r = ((pixel>>16)&0xFF);						\
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diff changeset
   287
	g = ((pixel>>8)&0xFF);						\
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parents:
diff changeset
   288
	b = (pixel&0xFF);						\
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diff changeset
   289
	a = (pixel>>24);						\
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parents:
diff changeset
   290
}
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parents:
diff changeset
   291
#define RGBA_FROM_ABGR8888(pixel, r, g, b, a)				\
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diff changeset
   292
{									\
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parents:
diff changeset
   293
	r = (pixel&0xFF);						\
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parents:
diff changeset
   294
	g = ((pixel>>8)&0xFF);						\
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parents:
diff changeset
   295
	b = ((pixel>>16)&0xFF);						\
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parents:
diff changeset
   296
	a = (pixel>>24);						\
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diff changeset
   297
}
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parents:
diff changeset
   298
#define DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a)			   \
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diff changeset
   299
do {									   \
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parents:
diff changeset
   300
	switch (bpp) {							   \
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parents:
diff changeset
   301
		case 2:							   \
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   302
			pixel = *((Uint16 *)(buf));			   \
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parents:
diff changeset
   303
		break;							   \
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parents:
diff changeset
   304
									   \
74212992fb08 Initial revision
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parents:
diff changeset
   305
		case 3:	{/* FIXME: broken code (no alpha) */		   \
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parents:
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   306
		        Uint8 *b = (Uint8 *)buf;			   \
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parents:
diff changeset
   307
			if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		   \
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parents:
diff changeset
   308
			        pixel = b[0] + (b[1] << 8) + (b[2] << 16); \
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parents:
diff changeset
   309
			} else {					   \
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parents:
diff changeset
   310
			        pixel = (b[0] << 16) + (b[1] << 8) + b[2]; \
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parents:
diff changeset
   311
			}						   \
74212992fb08 Initial revision
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parents:
diff changeset
   312
		}							   \
74212992fb08 Initial revision
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parents:
diff changeset
   313
		break;							   \
74212992fb08 Initial revision
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parents:
diff changeset
   314
									   \
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parents:
diff changeset
   315
		case 4:							   \
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parents:
diff changeset
   316
			pixel = *((Uint32 *)(buf));			   \
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parents:
diff changeset
   317
		break;							   \
74212992fb08 Initial revision
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parents:
diff changeset
   318
									   \
74212992fb08 Initial revision
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parents:
diff changeset
   319
		default:						   \
74212992fb08 Initial revision
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parents:
diff changeset
   320
		        pixel = 0; /* stop gcc complaints */		   \
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parents:
diff changeset
   321
		break;							   \
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parents:
diff changeset
   322
	}								   \
74212992fb08 Initial revision
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parents:
diff changeset
   323
	RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a);			   \
74212992fb08 Initial revision
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parents:
diff changeset
   324
	pixel &= ~fmt->Amask;						   \
74212992fb08 Initial revision
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parents:
diff changeset
   325
} while(0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   326
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   327
/* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
74212992fb08 Initial revision
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parents:
diff changeset
   328
#define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a)				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   329
{									\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   330
	pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|				\
74212992fb08 Initial revision
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parents:
diff changeset
   331
		((g>>fmt->Gloss)<<fmt->Gshift)|				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   332
		((b>>fmt->Bloss)<<fmt->Bshift)|				\
535
917cc5c56176 Fixed alpha blending bug (thanks Glenn!)
Sam Lantinga <slouken@libsdl.org>
parents: 297
diff changeset
   333
		((a>>fmt->Aloss)<<fmt->Ashift);				\
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   334
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   335
#define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   336
{									\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   337
	switch (bpp) {							\
74212992fb08 Initial revision
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parents:
diff changeset
   338
		case 2: {						\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   339
			Uint16 pixel;					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   340
									\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   341
			PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a);	\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   342
			*((Uint16 *)(buf)) = pixel;			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   343
		}							\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   344
		break;							\
74212992fb08 Initial revision
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parents:
diff changeset
   345
									\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   346
		case 3: { /* FIXME: broken code (no alpha) */		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   347
                        if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   348
			        *((buf)+fmt->Rshift/8) = r;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   349
				*((buf)+fmt->Gshift/8) = g;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   350
				*((buf)+fmt->Bshift/8) = b;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   351
			} else {					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   352
			        *((buf)+2-fmt->Rshift/8) = r;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   353
				*((buf)+2-fmt->Gshift/8) = g;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   354
				*((buf)+2-fmt->Bshift/8) = b;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   355
			}						\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   356
		}							\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   357
		break;							\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   358
									\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   359
		case 4: {						\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   360
			Uint32 pixel;					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   361
									\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   362
			PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a);	\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   363
			*((Uint32 *)(buf)) = pixel;			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   364
		}							\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   365
		break;							\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   366
	}								\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   367
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   368
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   369
/* Blend the RGB values of two pixels based on a source alpha value */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   370
#define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)	\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   371
do {						\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   372
	dR = (((sR-dR)*(A))>>8)+dR;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   373
	dG = (((sG-dG)*(A))>>8)+dG;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   374
	dB = (((sB-dB)*(A))>>8)+dB;		\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   375
} while(0)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   376
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   377
/* 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
   378
#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
   379
/* 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
   380
#else
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   381
#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
   382
#endif
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   383
#ifdef USE_DUFFS_LOOP
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   384
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   385
/* 8-times unrolled loop */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   386
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   387
{ int n = (width+7)/8;							\
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
   388
	switch (width & 7) {						\
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   389
	case 0: do {	pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   390
	case 7:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   391
	case 6:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   392
	case 5:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   393
	case 4:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   394
	case 3:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   395
	case 2:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   396
	case 1:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   397
		} while ( --n > 0 );					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   398
	}								\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   399
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   400
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   401
/* 4-times unrolled loop */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   402
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   403
{ int n = (width+3)/4;							\
91
e85e03f195b4 From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents: 0
diff changeset
   404
	switch (width & 3) {						\
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   405
	case 0: do {	pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   406
	case 3:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   407
	case 2:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   408
	case 1:		pixel_copy_increment;				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   409
		} while ( --n > 0 );					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   410
	}								\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   411
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   412
689
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   413
/* 2 - times unrolled loop */
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   414
#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
   415
				double_pixel_copy_increment, width)	\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   416
{ int n, w = width;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   417
	if( w & 1 ) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   418
	    pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   419
	    w--;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   420
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   421
	if ( w > 0 )	{						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   422
	    n = ( w + 2) / 4;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   423
	    switch( w & 2 ) {						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   424
	    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
   425
	    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
   426
		    } while ( --n > 0 );					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   427
	    }								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   428
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   429
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   430
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   431
/* 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
   432
#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
   433
				double_pixel_copy_increment,		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   434
				quatro_pixel_copy_increment, width)	\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   435
{ int n, w = width;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   436
        if(w & 1) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   437
	  pixel_copy_increment;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   438
	  w--;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   439
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   440
	if(w & 2) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   441
	  double_pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   442
	  w -= 2;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   443
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   444
	if ( w > 0 ) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   445
	    n = ( w + 7 ) / 8;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   446
	    switch( w & 4 ) {						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   447
	    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
   448
	    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
   449
		    } while ( --n > 0 );					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   450
	    }								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   451
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   452
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   453
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   454
/* Use the 8-times version of the loop by default */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   455
#define DUFFS_LOOP(pixel_copy_increment, width)				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   456
	DUFFS_LOOP8(pixel_copy_increment, width)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   457
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   458
#else
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   459
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   460
/* 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
   461
#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
   462
			 double_pixel_copy_increment, width)		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   463
{ int n = width;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   464
    if( n & 1 ) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   465
	pixel_copy_increment;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   466
	n--;								\
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
    n=n>>1;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   469
    for(; n > 0; --n) {   						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   470
	double_pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   471
    }									\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   472
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   473
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   474
/* 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
   475
#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
   476
				double_pixel_copy_increment,		\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   477
				quatro_pixel_copy_increment, width)	\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   478
{ int n = width;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   479
        if(n & 1) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   480
	  pixel_copy_increment;						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   481
	  n--;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   482
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   483
	if(n & 2) {							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   484
	  double_pixel_copy_increment;					\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   485
	  n -= 2;							\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   486
	}								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   487
	n=n>>2;								\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   488
	for(; n > 0; --n) {   						\
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   489
	  quatro_pixel_copy_increment;					\
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
}
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   492
5bb080d35049 Date: Tue, 19 Aug 2003 17:57:00 +0200
Sam Lantinga <slouken@libsdl.org>
parents: 553
diff changeset
   493
/* Don't use Duff's device to unroll loops */
0
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   494
#define DUFFS_LOOP(pixel_copy_increment, width)				\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   495
{ int n;								\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   496
	for ( n=width; n > 0; --n ) {					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   497
		pixel_copy_increment;					\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   498
	}								\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   499
}
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   500
#define DUFFS_LOOP8(pixel_copy_increment, width)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   501
	DUFFS_LOOP(pixel_copy_increment, width)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   502
#define DUFFS_LOOP4(pixel_copy_increment, width)			\
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   503
	DUFFS_LOOP(pixel_copy_increment, width)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   504
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   505
#endif /* USE_DUFFS_LOOP */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   506
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   507
/* Prevent Visual C++ 6.0 from printing out stupid warnings */
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   508
#if defined(_MSC_VER) && (_MSC_VER >= 600)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   509
#pragma warning(disable: 4550)
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   510
#endif
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   511
74212992fb08 Initial revision
Sam Lantinga <slouken@lokigames.com>
parents:
diff changeset
   512
#endif /* _SDL_blit_h */