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comparison src/video/SDL_blit_slow.c @ 5143:e743b9c3f6d6

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Making the API simpler, the blend modes are "none, blend, add" and are supported by all renderers.
author Sam Lantinga <slouken@libsdl.org>
date Mon, 31 Jan 2011 23:23:57 -0800
parents 791b3256fb22
children d976b67150c5
comparison
equal deleted inserted replaced
5142:57851a238c8f 5143:e743b9c3f6d6
115 srcR = (srcR * srcA) / 255; 115 srcR = (srcR * srcA) / 255;
116 srcG = (srcG * srcA) / 255; 116 srcG = (srcG * srcA) / 255;
117 srcB = (srcB * srcA) / 255; 117 srcB = (srcB * srcA) / 255;
118 } 118 }
119 } 119 }
120 switch (flags & 120 switch (flags & (SDL_COPY_BLEND | SDL_COPY_ADD)) {
121 (SDL_COPY_MASK | SDL_COPY_BLEND | SDL_COPY_ADD |
122 SDL_COPY_MOD)) {
123 case 0: 121 case 0:
124 dstR = srcR; 122 dstR = srcR;
125 dstG = srcG; 123 dstG = srcG;
126 dstB = srcB; 124 dstB = srcB;
127 dstA = srcA; 125 dstA = srcA;
128 break;
129 case SDL_COPY_MASK:
130 if (srcA) {
131 dstR = srcR;
132 dstG = srcG;
133 dstB = srcB;
134 }
135 break; 126 break;
136 case SDL_COPY_BLEND: 127 case SDL_COPY_BLEND:
137 dstR = srcR + ((255 - srcA) * dstR) / 255; 128 dstR = srcR + ((255 - srcA) * dstR) / 255;
138 dstG = srcG + ((255 - srcA) * dstG) / 255; 129 dstG = srcG + ((255 - srcA) * dstG) / 255;
139 dstB = srcB + ((255 - srcA) * dstB) / 255; 130 dstB = srcB + ((255 - srcA) * dstB) / 255;
147 dstG = 255; 138 dstG = 255;
148 dstB = srcB + dstB; 139 dstB = srcB + dstB;
149 if (dstB > 255) 140 if (dstB > 255)
150 dstB = 255; 141 dstB = 255;
151 break; 142 break;
152 case SDL_COPY_MOD:
153 dstR = (srcR * dstR) / 255;
154 dstG = (srcG * dstG) / 255;
155 dstB = (srcB * dstB) / 255;
156 break;
157 } 143 }
158 if (dst_fmt->Amask) { 144 if (dst_fmt->Amask) {
159 ASSEMBLE_RGBA(dst, dstbpp, dst_fmt, dstR, dstG, dstB, dstA); 145 ASSEMBLE_RGBA(dst, dstbpp, dst_fmt, dstR, dstG, dstB, dstA);
160 } else { 146 } else {
161 ASSEMBLE_RGB(dst, dstbpp, dst_fmt, dstR, dstG, dstB); 147 ASSEMBLE_RGB(dst, dstbpp, dst_fmt, dstR, dstG, dstB);