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00055 #ifndef GCN_SDLPIXEL_HPP
00056 #define GCN_SDLPIXEL_HPP
00057
00058 #include "SDL.h"
00059
00060 #include "guichan/color.hpp"
00061
00062 namespace gcn
00063 {
00064
00073 inline const Color SDLgetPixel(SDL_Surface* surface, int x, int y)
00074 {
00075 int bpp = surface->format->BytesPerPixel;
00076
00077 SDL_LockSurface(surface);
00078
00079 Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
00080
00081 unsigned int color = 0;
00082
00083 switch(bpp)
00084 {
00085 case 1:
00086 color = *p;
00087 break;
00088
00089 case 2:
00090 color = *(Uint16 *)p;
00091 break;
00092
00093 case 3:
00094 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
00095 {
00096 color = p[0] << 16 | p[1] << 8 | p[2];
00097 }
00098 else
00099 {
00100 color = p[0] | p[1] << 8 | p[2] << 16;
00101 }
00102 break;
00103
00104 case 4:
00105 color = *(Uint32 *)p;
00106 break;
00107
00108 }
00109
00110 unsigned char r,g,b,a;
00111
00112 SDL_GetRGBA(color, surface->format, &r, &g, &b, &a);
00113 SDL_UnlockSurface(surface);
00114
00115 return Color(r,g,b,a);
00116 }
00117
00125 inline void SDLputPixel(SDL_Surface* surface, int x, int y, const Color& color)
00126 {
00127 int bpp = surface->format->BytesPerPixel;
00128
00129 SDL_LockSurface(surface);
00130
00131 Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
00132
00133 Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
00134
00135 switch(bpp)
00136 {
00137 case 1:
00138 *p = pixel;
00139 break;
00140
00141 case 2:
00142 *(Uint16 *)p = pixel;
00143 break;
00144
00145 case 3:
00146 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
00147 {
00148 p[0] = (pixel >> 16) & 0xff;
00149 p[1] = (pixel >> 8) & 0xff;
00150 p[2] = pixel & 0xff;
00151 }
00152 else
00153 {
00154 p[0] = pixel & 0xff;
00155 p[1] = (pixel >> 8) & 0xff;
00156 p[2] = (pixel >> 16) & 0xff;
00157 }
00158 break;
00159
00160 case 4:
00161 *(Uint32 *)p = pixel;
00162 break;
00163 }
00164
00165 SDL_UnlockSurface(surface);
00166 }
00167
00175 inline unsigned int SDLAlpha32(unsigned int src, unsigned int dst, unsigned char a)
00176 {
00177 unsigned int b = ((src & 0xff) * a + (dst & 0xff) * (255 - a)) >> 8;
00178 unsigned int g = ((src & 0xff00) * a + (dst & 0xff00) * (255 - a)) >> 8;
00179 unsigned int r = ((src & 0xff0000) * a + (dst & 0xff0000) * (255 - a)) >> 8;
00180
00181 return (b & 0xff) | (g & 0xff00) | (r & 0xff0000);
00182 }
00183
00191 inline void SDLputPixelAlpha(SDL_Surface* surface, int x, int y, const Color& color)
00192 {
00193 int bpp = surface->format->BytesPerPixel;
00194
00195 SDL_LockSurface(surface);
00196
00197 Uint8 *p = (Uint8 *)surface->pixels + y * surface->pitch + x * bpp;
00198
00199 Uint32 pixel = SDL_MapRGB(surface->format, color.r, color.g, color.b);
00200
00201 switch(bpp)
00202 {
00203 case 1:
00204 *p = pixel;
00205 break;
00206
00207 case 2:
00208 *(Uint16 *)p = pixel;
00209 break;
00210
00211 case 3:
00212 if(SDL_BYTEORDER == SDL_BIG_ENDIAN)
00213 {
00214 p[0] = (pixel >> 16) & 0xff;
00215 p[1] = (pixel >> 8) & 0xff;
00216 p[2] = pixel & 0xff;
00217 }
00218 else
00219 {
00220 p[0] = pixel & 0xff;
00221 p[1] = (pixel >> 8) & 0xff;
00222 p[2] = (pixel >> 16) & 0xff;
00223 }
00224 break;
00225
00226 case 4:
00227 *(Uint32 *)p = SDLAlpha32(pixel, *(Uint32 *)p, color.a);
00228 break;
00229 }
00230
00231 SDL_UnlockSurface(surface);
00232 }
00233 }
00234
00235 #endif // end GCN_SDLPIXEL_HPP