SDL_gfx
2.0.25
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00001 /* 00002 00003 SDL_gfxBlitFunc.h: custom blitters 00004 00005 Copyright (C) 2001-2012 Andreas Schiffler 00006 00007 This software is provided 'as-is', without any express or implied 00008 warranty. In no event will the authors be held liable for any damages 00009 arising from the use of this software. 00010 00011 Permission is granted to anyone to use this software for any purpose, 00012 including commercial applications, and to alter it and redistribute it 00013 freely, subject to the following restrictions: 00014 00015 1. The origin of this software must not be misrepresented; you must not 00016 claim that you wrote the original software. If you use this software 00017 in a product, an acknowledgment in the product documentation would be 00018 appreciated but is not required. 00019 00020 2. Altered source versions must be plainly marked as such, and must not be 00021 misrepresented as being the original software. 00022 00023 3. This notice may not be removed or altered from any source 00024 distribution. 00025 00026 Andreas Schiffler -- aschiffler at ferzkopp dot net 00027 00028 */ 00029 00030 #ifndef _SDL_gfxBlitFunc_h 00031 #define _SDL_gfxBlitFunc_h 00032 00033 /* Set up for C function definitions, even when using C++ */ 00034 #ifdef __cplusplus 00035 extern "C" { 00036 #endif 00037 00038 #include <stdio.h> 00039 #include <stdlib.h> 00040 00041 #include "SDL.h" 00042 #include "SDL_video.h" 00043 00044 00045 extern const unsigned int GFX_ALPHA_ADJUST_ARRAY[256]; 00046 00047 /* ---- Function Prototypes */ 00048 00049 #ifdef _MSC_VER 00050 # if defined(DLL_EXPORT) && !defined(LIBSDL_GFX_DLL_IMPORT) 00051 # define SDL_GFXBLITFUNC_SCOPE __declspec(dllexport) 00052 # else 00053 # ifdef LIBSDL_GFX_DLL_IMPORT 00054 # define SDL_GFXBLITFUNC_SCOPE __declspec(dllimport) 00055 # endif 00056 # endif 00057 #endif 00058 #ifndef SDL_GFXBLITFUNC_SCOPE 00059 # define SDL_GFXBLITFUNC_SCOPE extern 00060 #endif 00061 00062 00063 SDL_GFXBLITFUNC_SCOPE int SDL_gfxBlitRGBA(SDL_Surface * src, SDL_Rect * srcrect, SDL_Surface * dst, SDL_Rect * dstrect); 00064 00065 SDL_GFXBLITFUNC_SCOPE int SDL_gfxSetAlpha(SDL_Surface * src, Uint8 a); 00066 00067 SDL_GFXBLITFUNC_SCOPE int SDL_gfxMultiplyAlpha(SDL_Surface * src, Uint8 a); 00068 00069 /* -------- Macros */ 00070 00071 /* Define SDL macros locally as a substitute for an #include "SDL_blit.h", */ 00072 /* which doesn't work since the include file doesn't get installed. */ 00073 00077 typedef struct { 00078 Uint8 *s_pixels; 00079 int s_width; 00080 int s_height; 00081 int s_skip; 00082 Uint8 *d_pixels; 00083 int d_width; 00084 int d_height; 00085 int d_skip; 00086 void *aux_data; 00087 SDL_PixelFormat *src; 00088 Uint8 *table; 00089 SDL_PixelFormat *dst; 00090 } SDL_gfxBlitInfo; 00091 00095 #define GFX_RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a) \ 00096 { \ 00097 r = ((pixel&fmt->Rmask)>>fmt->Rshift)<<fmt->Rloss; \ 00098 g = ((pixel&fmt->Gmask)>>fmt->Gshift)<<fmt->Gloss; \ 00099 b = ((pixel&fmt->Bmask)>>fmt->Bshift)<<fmt->Bloss; \ 00100 a = ((pixel&fmt->Amask)>>fmt->Ashift)<<fmt->Aloss; \ 00101 } 00102 00106 #define GFX_DISASSEMBLE_RGBA(buf, bpp, fmt, pixel, r, g, b, a) \ 00107 do { \ 00108 pixel = *((Uint32 *)(buf)); \ 00109 GFX_RGBA_FROM_PIXEL(pixel, fmt, r, g, b, a); \ 00110 pixel &= ~fmt->Amask; \ 00111 } while(0) 00112 00116 #define GFX_PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a) \ 00117 { \ 00118 pixel = ((r>>fmt->Rloss)<<fmt->Rshift)| \ 00119 ((g>>fmt->Gloss)<<fmt->Gshift)| \ 00120 ((b>>fmt->Bloss)<<fmt->Bshift)| \ 00121 ((a<<fmt->Aloss)<<fmt->Ashift); \ 00122 } 00123 00127 #define GFX_ASSEMBLE_RGBA(buf, bpp, fmt, r, g, b, a) \ 00128 { \ 00129 Uint32 pixel; \ 00130 \ 00131 GFX_PIXEL_FROM_RGBA(pixel, fmt, r, g, b, a); \ 00132 *((Uint32 *)(buf)) = pixel; \ 00133 } 00134 00138 #define GFX_ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB) \ 00139 do { \ 00140 dR = (((sR-dR)*(A))/255)+dR; \ 00141 dG = (((sG-dG)*(A))/255)+dG; \ 00142 dB = (((sB-dB)*(A))/255)+dB; \ 00143 } while(0) 00144 00150 #define GFX_DUFFS_LOOP4(pixel_copy_increment, width) \ 00151 { int n = (width+3)/4; \ 00152 switch (width & 3) { \ 00153 case 0: do { pixel_copy_increment; \ 00154 case 3: pixel_copy_increment; \ 00155 case 2: pixel_copy_increment; \ 00156 case 1: pixel_copy_increment; \ 00157 } while ( --n > 0 ); \ 00158 } \ 00159 } 00160 00161 00162 00163 /* Ends C function definitions when using C++ */ 00164 #ifdef __cplusplus 00165 } 00166 #endif 00167 00168 #endif /* _SDL_gfxBlitFunc_h */