SDL_blit.h
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上传用户:sun1608
上传日期:2007-02-02
资源大小:6116k
文件大小:12k
源码类别:
流媒体/Mpeg4/MP4
开发平台:
Visual C++
- /*
- SDL - Simple DirectMedia Layer
- Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
- This library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public
- License as published by the Free Software Foundation; either
- version 2 of the License, or (at your option) any later version.
- This library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
- You should have received a copy of the GNU Library General Public
- License along with this library; if not, write to the Free
- Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- Sam Lantinga
- slouken@libsdl.org
- */
- #ifdef SAVE_RCSID
- static char rcsid =
- "@(#) $Id: SDL_blit.h,v 1.4 2002/04/22 21:38:03 wmay Exp $";
- #endif
- #ifndef _SDL_blit_h
- #define _SDL_blit_h
- #include "SDL_endian.h"
- /* The structure passed to the low level blit functions */
- typedef struct {
- Uint8 *s_pixels;
- int s_width;
- int s_height;
- int s_skip;
- Uint8 *d_pixels;
- int d_width;
- int d_height;
- int d_skip;
- void *aux_data;
- SDL_PixelFormat *src;
- Uint8 *table;
- SDL_PixelFormat *dst;
- } SDL_BlitInfo;
- /* The type definition for the low level blit functions */
- typedef void (*SDL_loblit)(SDL_BlitInfo *info);
- /* This is the private info structure for software accelerated blits */
- struct private_swaccel {
- SDL_loblit blit;
- void *aux_data;
- };
- /* Blit mapping definition */
- typedef struct SDL_BlitMap {
- SDL_Surface *dst;
- int identity;
- Uint8 *table;
- SDL_blit hw_blit;
- SDL_blit sw_blit;
- struct private_hwaccel *hw_data;
- struct private_swaccel *sw_data;
- /* the version count matches the destination; mismatch indicates
- an invalid mapping */
- unsigned int format_version;
- } SDL_BlitMap;
- /* Functions found in SDL_blit.c */
- extern int SDL_CalculateBlit(SDL_Surface *surface);
- /* Functions found in SDL_blit_{0,1,N,A}.c */
- extern SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int complex);
- extern SDL_loblit SDL_CalculateBlit1(SDL_Surface *surface, int complex);
- extern SDL_loblit SDL_CalculateBlitN(SDL_Surface *surface, int complex);
- extern SDL_loblit SDL_CalculateAlphaBlit(SDL_Surface *surface, int complex);
- /*
- * Useful macros for blitting routines
- */
- #define FORMAT_EQUAL(A, B)
- ((A)->BitsPerPixel == (B)->BitsPerPixel
- && ((A)->Rmask == (B)->Rmask) && ((A)->Amask == (B)->Amask))
- /* Load pixel of the specified format from a buffer and get its R-G-B values */
- /* FIXME: rescale values to 0..255 here? */
- #define RGB_FROM_PIXEL(pixel, fmt, r, g, b)
- {
- r = (((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss);
- g = (((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss);
- b = (((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss);
- }
- #define RGB_FROM_RGB565(pixel, r, g, b)
- {
- r = (((pixel&0xF800)>>11)<<3);
- g = (((pixel&0x07E0)>>5)<<2);
- b = ((pixel&0x001F)<<3);
- }
- #define RGB_FROM_RGB555(pixel, r, g, b)
- {
- r = (((pixel&0x7C00)>>10)<<3);
- g = (((pixel&0x03E0)>>5)<<3);
- b = ((pixel&0x001F)<<3);
- }
- #define RGB_FROM_RGB888(pixel, r, g, b)
- {
- r = ((pixel&0xFF0000)>>16);
- g = ((pixel&0xFF00)>>8);
- b = (pixel&0xFF);
- }
- #define RETRIEVE_RGB_PIXEL(buf, bpp, pixel)
- do {
- switch (bpp) {
- case 2:
- pixel = *((Uint16 *)(buf));
- break;
- case 3: {
- Uint8 *B = (Uint8 *)(buf);
- if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
- pixel = B[0] + (B[1] << 8) + (B[2] << 16);
- } else {
- pixel = (B[0] << 16) + (B[1] << 8) + B[2];
- }
- }
- break;
- case 4:
- pixel = *((Uint32 *)(buf));
- break;
- default:
- pixel = 0; /* appease gcc */
- break;
- }
- } while(0)
- #define DISEMBLE_RGB(buf, bpp, fmt, pixel, r, g, b)
- do {
- switch (bpp) {
- case 2:
- pixel = *((Uint16 *)(buf));
- break;
- case 3: {
- Uint8 *B = (Uint8 *)buf;
- if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
- pixel = B[0] + (B[1] << 8) + (B[2] << 16);
- } else {
- pixel = (B[0] << 16) + (B[1] << 8) + B[2];
- }
- }
- break;
- case 4:
- pixel = *((Uint32 *)(buf));
- break;
- default:
- pixel = 0; /* prevent gcc from complaining */
- break;
- }
- RGB_FROM_PIXEL(pixel, fmt, r, g, b);
- } while(0)
- /* Assemble R-G-B values into a specified pixel format and store them */
- #define PIXEL_FROM_RGB(pixel, fmt, r, g, b)
- {
- pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|
- ((g>>fmt->Gloss)<<fmt->Gshift)|
- ((b>>fmt->Bloss)<<fmt->Bshift);
- }
- #define RGB565_FROM_RGB(pixel, r, g, b)
- {
- pixel = ((r>>3)<<11)|((g>>2)<<5)|(b>>3);
- }
- #define RGB555_FROM_RGB(pixel, r, g, b)
- {
- pixel = ((r>>3)<<10)|((g>>3)<<5)|(b>>3);
- }
- #define RGB888_FROM_RGB(pixel, r, g, b)
- {
- pixel = (r<<16)|(g<<8)|b;
- }
- #define ASSEMBLE_RGB(buf, bpp, fmt, r, g, b)
- {
- switch (bpp) {
- case 2: {
- Uint16 pixel;
- PIXEL_FROM_RGB(pixel, fmt, r, g, b);
- *((Uint16 *)(buf)) = pixel;
- }
- break;
- case 3: {
- if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
- *((buf)+fmt->Rshift/8) = r;
- *((buf)+fmt->Gshift/8) = g;
- *((buf)+fmt->Bshift/8) = b;
- } else {
- *((buf)+2-fmt->Rshift/8) = r;
- *((buf)+2-fmt->Gshift/8) = g;
- *((buf)+2-fmt->Bshift/8) = b;
- }
- }
- break;
- case 4: {
- Uint32 pixel;
- PIXEL_FROM_RGB(pixel, fmt, r, g, b);
- *((Uint32 *)(buf)) = pixel;
- }
- break;
- }
- }
- #define ASSEMBLE_RGB_AMASK(buf, bpp, fmt, r, g, b, Amask)
- {
- switch (bpp) {
- case 2: {
- Uint16 *bufp;
- Uint16 pixel;
- bufp = (Uint16 *)buf;
- PIXEL_FROM_RGB(pixel, fmt, r, g, b);
- *bufp = pixel | (*bufp & Amask);
- }
- break;
- case 3: {
- if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
- *((buf)+fmt->Rshift/8) = r;
- *((buf)+fmt->Gshift/8) = g;
- *((buf)+fmt->Bshift/8) = b;
- } else {
- *((buf)+2-fmt->Rshift/8) = r;
- *((buf)+2-fmt->Gshift/8) = g;
- *((buf)+2-fmt->Bshift/8) = b;
- }
- }
- break;
- case 4: {
- Uint32 *bufp;
- Uint32 pixel;
- bufp = (Uint32 *)buf;
- PIXEL_FROM_RGB(pixel, fmt, r, g, b);
- *bufp = pixel | (*bufp & Amask);
- }
- break;
- }
- }
- /* FIXME: Should we rescale alpha into 0..255 here? */
- #define RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a)
- {
- r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss;
- g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss;
- b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss;
- a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss;
- }
- #define RGBA_FROM_8888(pixel, fmt, r, g, b, a)
- {
- r = (pixel&fmt->Rmask)>>fmt->Rshift;
- g = (pixel&fmt->Gmask)>>fmt->Gshift;
- b = (pixel&fmt->Bmask)>>fmt->Bshift;
- a = (pixel&fmt->Amask)>>fmt->Ashift;
- }
- #define RGBA_FROM_RGBA8888(pixel, r, g, b, a)
- {
- r = (pixel>>24);
- g = ((pixel>>16)&0xFF);
- b = ((pixel>>8)&0xFF);
- a = (pixel&0xFF);
- }
- #define RGBA_FROM_ARGB8888(pixel, r, g, b, a)
- {
- r = ((pixel>>16)&0xFF);
- g = ((pixel>>8)&0xFF);
- b = (pixel&0xFF);
- a = (pixel>>24);
- }
- #define RGBA_FROM_ABGR8888(pixel, r, g, b, a)
- {
- r = (pixel&0xFF);
- g = ((pixel>>8)&0xFF);
- b = ((pixel>>16)&0xFF);
- a = (pixel>>24);
- }
- #define DISEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a)
- do {
- switch (bpp) {
- case 2:
- pixel = *((Uint16 *)(buf));
- break;
- case 3: {/* FIXME: broken code (no alpha) */
- Uint8 *b = (Uint8 *)buf;
- if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
- pixel = b[0] + (b[1] << 8) + (b[2] << 16);
- } else {
- pixel = (b[0] << 16) + (b[1] << 8) + b[2];
- }
- }
- break;
- case 4:
- pixel = *((Uint32 *)(buf));
- break;
- default:
- pixel = 0; /* stop gcc complaints */
- break;
- }
- RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a);
- pixel &= ~fmt->Amask;
- } while(0)
- /* FIXME: this isn't correct, especially for Alpha (maximum != 255) */
- #define PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a)
- {
- pixel = ((r>>fmt->Rloss)<<fmt->Rshift)|
- ((g>>fmt->Gloss)<<fmt->Gshift)|
- ((b>>fmt->Bloss)<<fmt->Bshift)|
- ((a<<fmt->Aloss)<<fmt->Ashift);
- }
- #define ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a)
- {
- switch (bpp) {
- case 2: {
- Uint16 pixel;
- PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a);
- *((Uint16 *)(buf)) = pixel;
- }
- break;
- case 3: { /* FIXME: broken code (no alpha) */
- if(SDL_BYTEORDER == SDL_LIL_ENDIAN) {
- *((buf)+fmt->Rshift/8) = r;
- *((buf)+fmt->Gshift/8) = g;
- *((buf)+fmt->Bshift/8) = b;
- } else {
- *((buf)+2-fmt->Rshift/8) = r;
- *((buf)+2-fmt->Gshift/8) = g;
- *((buf)+2-fmt->Bshift/8) = b;
- }
- }
- break;
- case 4: {
- Uint32 pixel;
- PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a);
- *((Uint32 *)(buf)) = pixel;
- }
- break;
- }
- }
- /* Blend the RGB values of two pixels based on a source alpha value */
- #define ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB)
- do {
- dR = (((sR-dR)*(A))>>8)+dR;
- dG = (((sG-dG)*(A))>>8)+dG;
- dB = (((sB-dB)*(A))>>8)+dB;
- } while(0)
- /* This is a very useful loop for optimizing blitters */
- #define USE_DUFFS_LOOP
- #ifdef USE_DUFFS_LOOP
- /* 8-times unrolled loop */
- #define DUFFS_LOOP8(pixel_copy_increment, width)
- { int n = (width+7)/8;
- switch (width & 7) {
- case 0: do { pixel_copy_increment;
- case 7: pixel_copy_increment;
- case 6: pixel_copy_increment;
- case 5: pixel_copy_increment;
- case 4: pixel_copy_increment;
- case 3: pixel_copy_increment;
- case 2: pixel_copy_increment;
- case 1: pixel_copy_increment;
- } while ( --n > 0 );
- }
- }
- /* 4-times unrolled loop */
- #define DUFFS_LOOP4(pixel_copy_increment, width)
- { int n = (width+3)/4;
- switch (width & 3) {
- case 0: do { pixel_copy_increment;
- case 3: pixel_copy_increment;
- case 2: pixel_copy_increment;
- case 1: pixel_copy_increment;
- } while ( --n > 0 );
- }
- }
- /* Use the 8-times version of the loop by default */
- #define DUFFS_LOOP(pixel_copy_increment, width)
- DUFFS_LOOP8(pixel_copy_increment, width)
- #else
- /* Don't use Duff's device to unroll loops */
- #define DUFFS_LOOP(pixel_copy_increment, width)
- { int n;
- for ( n=width; n > 0; --n ) {
- pixel_copy_increment;
- }
- }
- #define DUFFS_LOOP8(pixel_copy_increment, width)
- DUFFS_LOOP(pixel_copy_increment, width)
- #define DUFFS_LOOP4(pixel_copy_increment, width)
- DUFFS_LOOP(pixel_copy_increment, width)
- #endif /* USE_DUFFS_LOOP */
- /* Prevent Visual C++ 6.0 from printing out stupid warnings */
- #if defined(_MSC_VER) && (_MSC_VER >= 600)
- #pragma warning(disable: 4550)
- #endif
- #endif /* _SDL_blit_h */