Mercurial > sdl-ios-xcode
view src/video/SDL_blit.h @ 1488:29ea15e37aea
Eric is setting up X11 support for the XCode project
author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 09 Mar 2006 13:25:43 +0000 |
parents | d910939febfa |
children | 782fd950bd46 c121d94672cb 8582c6a5ca16 |
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/* SDL - Simple DirectMedia Layer Copyright (C) 1997-2006 Sam Lantinga This library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. This library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with this library; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA Sam Lantinga slouken@libsdl.org */ #include "SDL_config.h" #ifndef _SDL_blit_h #define _SDL_blit_h #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) /* Blend the RGB values of two Pixels based on a source alpha value */ #define ACCURATE_ALPHA_BLEND(sR, sG, sB, sA, dR, dG, dB) \ do { \ unsigned tR, tG, tB, tA; \ tA = 255 - sA; \ tR = 1 + (sR * sA) + (dR * tA); \ dR = (tR + (tR >> 8)) >> 8; \ tG = 1 + (sG * sA) + (dG * tA); \ dG = (tG + (tG >> 8)) >> 8; \ tB = 1 + (sB * sA) + (dB * tA); \ dB = (tB + (tB >> 8)) >> 8; \ } while(0) /* This is a very useful loop for optimizing blitters */ #if defined(_MSC_VER) && (_MSC_VER == 1300) /* There's a bug in the Visual C++ 7 optimizer when compiling this code */ #else #define USE_DUFFS_LOOP #endif #ifdef USE_DUFFS_LOOP /* 8-times unrolled loop */ #define DUFFS_LOOP8(pixel_copy_increment, width) \ { int n = (width+7)/8; \ switch (width & 7) { \ case 0: do { pixel_copy_increment; \ case 7: pixel_copy_increment; \ case 6: pixel_copy_increment; \ case 5: pixel_copy_increment; \ case 4: pixel_copy_increment; \ case 3: pixel_copy_increment; \ case 2: pixel_copy_increment; \ case 1: pixel_copy_increment; \ } while ( --n > 0 ); \ } \ } /* 4-times unrolled loop */ #define DUFFS_LOOP4(pixel_copy_increment, width) \ { int n = (width+3)/4; \ switch (width & 3) { \ case 0: do { pixel_copy_increment; \ case 3: pixel_copy_increment; \ case 2: pixel_copy_increment; \ case 1: pixel_copy_increment; \ } while ( --n > 0 ); \ } \ } /* 2 - times unrolled loop */ #define DUFFS_LOOP_DOUBLE2(pixel_copy_increment, \ double_pixel_copy_increment, width) \ { int n, w = width; \ if( w & 1 ) { \ pixel_copy_increment; \ w--; \ } \ if ( w > 0 ) { \ n = ( w + 2) / 4; \ switch( w & 2 ) { \ case 0: do { double_pixel_copy_increment; \ case 2: double_pixel_copy_increment; \ } while ( --n > 0 ); \ } \ } \ } /* 2 - times unrolled loop 4 pixels */ #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ double_pixel_copy_increment, \ quatro_pixel_copy_increment, width) \ { int n, w = width; \ if(w & 1) { \ pixel_copy_increment; \ w--; \ } \ if(w & 2) { \ double_pixel_copy_increment; \ w -= 2; \ } \ if ( w > 0 ) { \ n = ( w + 7 ) / 8; \ switch( w & 4 ) { \ case 0: do { quatro_pixel_copy_increment; \ case 4: quatro_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_DOUBLE2(pixel_copy_increment, \ double_pixel_copy_increment, width) \ { int n = width; \ if( n & 1 ) { \ pixel_copy_increment; \ n--; \ } \ n=n>>1; \ for(; n > 0; --n) { \ double_pixel_copy_increment; \ } \ } /* Don't use Duff's device to unroll loops */ #define DUFFS_LOOP_QUATRO2(pixel_copy_increment, \ double_pixel_copy_increment, \ quatro_pixel_copy_increment, width) \ { int n = width; \ if(n & 1) { \ pixel_copy_increment; \ n--; \ } \ if(n & 2) { \ double_pixel_copy_increment; \ n -= 2; \ } \ n=n>>2; \ for(; n > 0; --n) { \ quatro_pixel_copy_increment; \ } \ } /* 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 */