Mercurial > sdl-ios-xcode
annotate src/video/SDL_RLEaccel.c @ 1403:376665398b25
Catch the C++ and Objective C sources too...
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 21 Feb 2006 08:47:46 +0000 |
| parents | d910939febfa |
| children | 5f52867ba65c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* | |
| 25 * RLE encoding for software colorkey and alpha-channel acceleration | |
| 26 * | |
| 27 * Original version by Sam Lantinga | |
| 28 * | |
| 29 * Mattias Engdegård (Yorick): Rewrite. New encoding format, encoder and | |
| 30 * decoder. Added per-surface alpha blitter. Added per-pixel alpha | |
| 31 * format, encoder and blitter. | |
| 32 * | |
| 33 * Many thanks to Xark and johns for hints, benchmarks and useful comments | |
| 34 * leading to this code. | |
| 35 * | |
| 36 * Welcome to Macro Mayhem. | |
| 37 */ | |
| 38 | |
| 39 /* | |
| 40 * The encoding translates the image data to a stream of segments of the form | |
| 41 * | |
| 42 * <skip> <run> <data> | |
| 43 * | |
| 44 * where <skip> is the number of transparent pixels to skip, | |
| 45 * <run> is the number of opaque pixels to blit, | |
| 46 * and <data> are the pixels themselves. | |
| 47 * | |
| 48 * This basic structure is used both for colorkeyed surfaces, used for simple | |
| 49 * binary transparency and for per-surface alpha blending, and for surfaces | |
| 50 * with per-pixel alpha. The details differ, however: | |
| 51 * | |
| 52 * Encoding of colorkeyed surfaces: | |
| 53 * | |
| 54 * Encoded pixels always have the same format as the target surface. | |
| 55 * <skip> and <run> are unsigned 8 bit integers, except for 32 bit depth | |
| 56 * where they are 16 bit. This makes the pixel data aligned at all times. | |
| 57 * Segments never wrap around from one scan line to the next. | |
| 58 * | |
| 59 * The end of the sequence is marked by a zero <skip>,<run> pair at the * | |
| 60 * beginning of a line. | |
| 61 * | |
| 62 * Encoding of surfaces with per-pixel alpha: | |
| 63 * | |
| 64 * The sequence begins with a struct RLEDestFormat describing the target | |
| 65 * pixel format, to provide reliable un-encoding. | |
| 66 * | |
| 67 * Each scan line is encoded twice: First all completely opaque pixels, | |
| 68 * encoded in the target format as described above, and then all | |
| 69 * partially transparent (translucent) pixels (where 1 <= alpha <= 254), | |
| 70 * in the following 32-bit format: | |
| 71 * | |
| 72 * For 32-bit targets, each pixel has the target RGB format but with | |
| 73 * the alpha value occupying the highest 8 bits. The <skip> and <run> | |
| 74 * counts are 16 bit. | |
| 75 * | |
| 76 * For 16-bit targets, each pixel has the target RGB format, but with | |
| 77 * the middle component (usually green) shifted 16 steps to the left, | |
| 78 * and the hole filled with the 5 most significant bits of the alpha value. | |
| 79 * i.e. if the target has the format rrrrrggggggbbbbb, | |
| 80 * the encoded pixel will be 00000gggggg00000rrrrr0aaaaabbbbb. | |
| 81 * The <skip> and <run> counts are 8 bit for the opaque lines, 16 bit | |
| 82 * for the translucent lines. Two padding bytes may be inserted | |
| 83 * before each translucent line to keep them 32-bit aligned. | |
| 84 * | |
| 85 * The end of the sequence is marked by a zero <skip>,<run> pair at the | |
| 86 * beginning of an opaque line. | |
| 87 */ | |
| 88 | |
| 89 #include "SDL_video.h" | |
| 90 #include "SDL_sysvideo.h" | |
| 91 #include "SDL_blit.h" | |
| 92 #include "SDL_RLEaccel_c.h" | |
| 93 | |
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94 #if defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__)) && SDL_ASSEMBLY_ROUTINES |
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95 #define MMX_ASMBLIT |
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96 #endif |
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97 |
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98 #ifdef MMX_ASMBLIT |
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99 #include "mmx.h" |
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100 #include "SDL_cpuinfo.h" |
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101 #endif |
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102 |
| 0 | 103 #ifndef MAX |
| 104 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 105 #endif | |
| 106 #ifndef MIN | |
| 107 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 108 #endif | |
| 109 | |
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110 #define PIXEL_COPY(to, from, len, bpp) \ |
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111 do { \ |
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112 if(bpp == 4) { \ |
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113 SDL_memcpy4(to, from, (unsigned)(len)); \ |
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114 } else { \ |
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115 SDL_memcpy(to, from, (unsigned)(len) * (bpp)); \ |
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116 } \ |
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117 } while(0) |
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118 |
| 0 | 119 /* |
| 120 * Various colorkey blit methods, for opaque and per-surface alpha | |
| 121 */ | |
| 122 | |
| 123 #define OPAQUE_BLIT(to, from, length, bpp, alpha) \ | |
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124 PIXEL_COPY(to, from, length, bpp) |
| 0 | 125 |
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126 #ifdef MMX_ASMBLIT |
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127 |
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128 #define ALPHA_BLIT32_888MMX(to, from, length, bpp, alpha) \ |
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129 do { \ |
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130 Uint32 *srcp = (Uint32 *)(from); \ |
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131 Uint32 *dstp = (Uint32 *)(to); \ |
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132 int i = 0x00FF00FF; \ |
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133 movd_m2r(*(&i), mm3); \ |
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134 punpckldq_r2r(mm3, mm3); \ |
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135 i = 0xFF000000; \ |
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136 movd_m2r(*(&i), mm7); \ |
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137 punpckldq_r2r(mm7, mm7); \ |
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138 i = alpha | alpha << 16; \ |
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139 movd_m2r(*(&i), mm4); \ |
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140 punpckldq_r2r(mm4, mm4); \ |
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141 pcmpeqd_r2r(mm5,mm5); /* set mm5 to "1" */ \ |
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142 pxor_r2r(mm7, mm5); /* make clear alpha mask */ \ |
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143 i = length; \ |
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144 if(i & 1) { \ |
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145 movd_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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146 punpcklbw_r2r(mm1, mm1); \ |
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147 pand_r2r(mm3, mm1); \ |
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148 movd_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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149 punpcklbw_r2r(mm2, mm2); \ |
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150 pand_r2r(mm3, mm2); \ |
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151 psubw_r2r(mm2, mm1); \ |
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152 pmullw_r2r(mm4, mm1); \ |
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153 psrlw_i2r(8, mm1); \ |
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154 paddw_r2r(mm1, mm2); \ |
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155 pand_r2r(mm3, mm2); \ |
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156 packuswb_r2r(mm2, mm2); \ |
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157 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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158 movd_r2m(mm2, *dstp); \ |
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159 ++srcp; \ |
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160 ++dstp; \ |
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161 i--; \ |
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162 } \ |
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163 for(; i > 0; --i) { \ |
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164 movq_m2r((*srcp), mm0); \ |
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165 movq_r2r(mm0, mm1); \ |
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166 punpcklbw_r2r(mm0, mm0); \ |
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167 movq_m2r((*dstp), mm2); \ |
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168 punpckhbw_r2r(mm1, mm1); \ |
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169 movq_r2r(mm2, mm6); \ |
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170 pand_r2r(mm3, mm0); \ |
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171 punpcklbw_r2r(mm2, mm2); \ |
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172 pand_r2r(mm3, mm1); \ |
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173 punpckhbw_r2r(mm6, mm6); \ |
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174 pand_r2r(mm3, mm2); \ |
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175 psubw_r2r(mm2, mm0); \ |
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176 pmullw_r2r(mm4, mm0); \ |
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177 pand_r2r(mm3, mm6); \ |
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178 psubw_r2r(mm6, mm1); \ |
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179 pmullw_r2r(mm4, mm1); \ |
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180 psrlw_i2r(8, mm0); \ |
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181 paddw_r2r(mm0, mm2); \ |
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182 psrlw_i2r(8, mm1); \ |
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183 paddw_r2r(mm1, mm6); \ |
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184 pand_r2r(mm3, mm2); \ |
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185 pand_r2r(mm3, mm6); \ |
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186 packuswb_r2r(mm2, mm2); \ |
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187 packuswb_r2r(mm6, mm6); \ |
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188 psrlq_i2r(32, mm2); \ |
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189 psllq_i2r(32, mm6); \ |
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190 por_r2r(mm6, mm2); \ |
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191 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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192 movq_r2m(mm2, *dstp); \ |
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193 srcp += 2; \ |
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194 dstp += 2; \ |
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195 i--; \ |
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196 } \ |
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197 emms(); \ |
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198 } while(0) |
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199 |
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200 #define ALPHA_BLIT16_565MMX(to, from, length, bpp, alpha) \ |
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201 do { \ |
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202 int i, n = 0; \ |
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203 Uint16 *srcp = (Uint16 *)(from); \ |
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204 Uint16 *dstp = (Uint16 *)(to); \ |
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205 Uint32 ALPHA = 0xF800; \ |
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206 movd_m2r(*(&ALPHA), mm1); \ |
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207 punpcklwd_r2r(mm1, mm1); \ |
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208 punpcklwd_r2r(mm1, mm1); \ |
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209 ALPHA = 0x07E0; \ |
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210 movd_m2r(*(&ALPHA), mm4); \ |
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211 punpcklwd_r2r(mm4, mm4); \ |
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212 punpcklwd_r2r(mm4, mm4); \ |
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213 ALPHA = 0x001F; \ |
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214 movd_m2r(*(&ALPHA), mm7); \ |
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215 punpcklwd_r2r(mm7, mm7); \ |
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216 punpcklwd_r2r(mm7, mm7); \ |
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217 alpha &= ~(1+2+4); \ |
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218 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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219 movd_m2r(*(&i), mm0); \ |
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220 punpckldq_r2r(mm0, mm0); \ |
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221 ALPHA = alpha >> 3; \ |
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222 i = ((int)(length) & 3); \ |
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223 for(; i > 0; --i) { \ |
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224 Uint32 s = *srcp++; \ |
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225 Uint32 d = *dstp; \ |
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226 s = (s | s << 16) & 0x07e0f81f; \ |
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227 d = (d | d << 16) & 0x07e0f81f; \ |
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228 d += (s - d) * ALPHA >> 5; \ |
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229 d &= 0x07e0f81f; \ |
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230 *dstp++ = d | d >> 16; \ |
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231 n++; \ |
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232 } \ |
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233 i = (int)(length) - n; \ |
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234 for(; i > 0; --i) { \ |
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235 movq_m2r((*dstp), mm3); \ |
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236 movq_m2r((*srcp), mm2); \ |
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237 movq_r2r(mm2, mm5); \ |
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238 pand_r2r(mm1 , mm5); \ |
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239 psrlq_i2r(11, mm5); \ |
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240 movq_r2r(mm3, mm6); \ |
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241 pand_r2r(mm1 , mm6); \ |
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242 psrlq_i2r(11, mm6); \ |
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243 psubw_r2r(mm6, mm5); \ |
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244 pmullw_r2r(mm0, mm5); \ |
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245 psrlw_i2r(8, mm5); \ |
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246 paddw_r2r(mm5, mm6); \ |
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247 psllq_i2r(11, mm6); \ |
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248 pand_r2r(mm1, mm6); \ |
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249 movq_r2r(mm4, mm5); \ |
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250 por_r2r(mm7, mm5); \ |
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251 pand_r2r(mm5, mm3); \ |
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252 por_r2r(mm6, mm3); \ |
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253 movq_r2r(mm2, mm5); \ |
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254 pand_r2r(mm4 , mm5); \ |
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255 psrlq_i2r(5, mm5); \ |
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256 movq_r2r(mm3, mm6); \ |
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257 pand_r2r(mm4 , mm6); \ |
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258 psrlq_i2r(5, mm6); \ |
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259 psubw_r2r(mm6, mm5); \ |
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260 pmullw_r2r(mm0, mm5); \ |
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261 psrlw_i2r(8, mm5); \ |
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262 paddw_r2r(mm5, mm6); \ |
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263 psllq_i2r(5, mm6); \ |
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264 pand_r2r(mm4, mm6); \ |
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265 movq_r2r(mm1, mm5); \ |
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266 por_r2r(mm7, mm5); \ |
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267 pand_r2r(mm5, mm3); \ |
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268 por_r2r(mm6, mm3); \ |
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269 movq_r2r(mm2, mm5); \ |
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270 pand_r2r(mm7 , mm5); \ |
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271 movq_r2r(mm3, mm6); \ |
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272 pand_r2r(mm7 , mm6); \ |
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273 psubw_r2r(mm6, mm5); \ |
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274 pmullw_r2r(mm0, mm5); \ |
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275 psrlw_i2r(8, mm5); \ |
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276 paddw_r2r(mm5, mm6); \ |
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277 pand_r2r(mm7, mm6); \ |
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278 movq_r2r(mm1, mm5); \ |
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279 por_r2r(mm4, mm5); \ |
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280 pand_r2r(mm5, mm3); \ |
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281 por_r2r(mm6, mm3); \ |
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282 movq_r2m(mm3, *dstp); \ |
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283 srcp += 4; \ |
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284 dstp += 4; \ |
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285 i -= 3; \ |
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286 } \ |
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287 emms(); \ |
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288 } while(0) |
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289 |
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290 #define ALPHA_BLIT16_555MMX(to, from, length, bpp, alpha) \ |
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291 do { \ |
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292 int i, n = 0; \ |
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293 Uint16 *srcp = (Uint16 *)(from); \ |
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294 Uint16 *dstp = (Uint16 *)(to); \ |
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295 Uint32 ALPHA = 0x7C00; \ |
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296 movd_m2r(*(&ALPHA), mm1); \ |
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297 punpcklwd_r2r(mm1, mm1); \ |
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298 punpcklwd_r2r(mm1, mm1); \ |
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299 ALPHA = 0x03E0; \ |
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300 movd_m2r(*(&ALPHA), mm4); \ |
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301 punpcklwd_r2r(mm4, mm4); \ |
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302 punpcklwd_r2r(mm4, mm4); \ |
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303 ALPHA = 0x001F; \ |
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304 movd_m2r(*(&ALPHA), mm7); \ |
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305 punpcklwd_r2r(mm7, mm7); \ |
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306 punpcklwd_r2r(mm7, mm7); \ |
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307 alpha &= ~(1+2+4); \ |
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308 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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309 movd_m2r(*(&i), mm0); \ |
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310 punpckldq_r2r(mm0, mm0); \ |
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311 i = ((int)(length) & 3); \ |
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312 ALPHA = alpha >> 3; \ |
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313 for(; i > 0; --i) { \ |
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314 Uint32 s = *srcp++; \ |
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315 Uint32 d = *dstp; \ |
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316 s = (s | s << 16) & 0x03e07c1f; \ |
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317 d = (d | d << 16) & 0x03e07c1f; \ |
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318 d += (s - d) * ALPHA >> 5; \ |
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319 d &= 0x03e07c1f; \ |
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320 *dstp++ = d | d >> 16; \ |
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321 n++; \ |
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322 } \ |
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323 i = (int)(length) - n; \ |
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324 for(; i > 0; --i) { \ |
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325 movq_m2r((*dstp), mm3); \ |
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326 movq_m2r((*srcp), mm2); \ |
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327 movq_r2r(mm2, mm5); \ |
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328 pand_r2r(mm1 , mm5); \ |
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329 psrlq_i2r(10, mm5); \ |
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330 movq_r2r(mm3, mm6); \ |
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331 pand_r2r(mm1 , mm6); \ |
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332 psrlq_i2r(10, mm6); \ |
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333 psubw_r2r(mm6, mm5); \ |
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334 pmullw_r2r(mm0, mm5); \ |
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335 psrlw_i2r(8, mm5); \ |
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336 paddw_r2r(mm5, mm6); \ |
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337 psllq_i2r(10, mm6); \ |
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338 pand_r2r(mm1, mm6); \ |
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339 movq_r2r(mm4, mm5); \ |
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340 por_r2r(mm7, mm5); \ |
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341 pand_r2r(mm5, mm3); \ |
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342 por_r2r(mm6, mm3); \ |
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343 movq_r2r(mm2, mm5); \ |
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344 pand_r2r(mm4 , mm5); \ |
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345 psrlq_i2r(5, mm5); \ |
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346 movq_r2r(mm3, mm6); \ |
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347 pand_r2r(mm4 , mm6); \ |
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348 psrlq_i2r(5, mm6); \ |
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349 psubw_r2r(mm6, mm5); \ |
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350 pmullw_r2r(mm0, mm5); \ |
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351 psrlw_i2r(8, mm5); \ |
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352 paddw_r2r(mm5, mm6); \ |
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353 psllq_i2r(5, mm6); \ |
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354 pand_r2r(mm4, mm6); \ |
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355 movq_r2r(mm1, mm5); \ |
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356 por_r2r(mm7, mm5); \ |
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357 pand_r2r(mm5, mm3); \ |
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358 por_r2r(mm6, mm3); \ |
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359 movq_r2r(mm2, mm5); \ |
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360 pand_r2r(mm7 , mm5); \ |
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361 movq_r2r(mm3, mm6); \ |
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362 pand_r2r(mm7 , mm6); \ |
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363 psubw_r2r(mm6, mm5); \ |
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364 pmullw_r2r(mm0, mm5); \ |
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365 psrlw_i2r(8, mm5); \ |
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366 paddw_r2r(mm5, mm6); \ |
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367 pand_r2r(mm7, mm6); \ |
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368 movq_r2r(mm1, mm5); \ |
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369 por_r2r(mm4, mm5); \ |
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370 pand_r2r(mm5, mm3); \ |
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371 por_r2r(mm6, mm3); \ |
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372 movq_r2m(mm3, *dstp); \ |
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373 srcp += 4; \ |
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374 dstp += 4; \ |
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375 i -= 3; \ |
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376 } \ |
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377 emms(); \ |
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378 } while(0) |
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379 |
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380 #endif |
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381 |
| 0 | 382 /* |
| 383 * For 32bpp pixels on the form 0x00rrggbb: | |
| 384 * If we treat the middle component separately, we can process the two | |
| 385 * remaining in parallel. This is safe to do because of the gap to the left | |
| 386 * of each component, so the bits from the multiplication don't collide. | |
| 387 * This can be used for any RGB permutation of course. | |
| 388 */ | |
| 389 #define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \ | |
| 390 do { \ | |
| 391 int i; \ | |
| 392 Uint32 *src = (Uint32 *)(from); \ | |
| 393 Uint32 *dst = (Uint32 *)(to); \ | |
| 394 for(i = 0; i < (int)(length); i++) { \ | |
| 395 Uint32 s = *src++; \ | |
| 396 Uint32 d = *dst; \ | |
| 397 Uint32 s1 = s & 0xff00ff; \ | |
| 398 Uint32 d1 = d & 0xff00ff; \ | |
| 399 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 400 s &= 0xff00; \ | |
| 401 d &= 0xff00; \ | |
| 402 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 403 *dst++ = d1 | d; \ | |
| 404 } \ | |
| 405 } while(0) | |
| 406 | |
| 407 /* | |
| 408 * For 16bpp pixels we can go a step further: put the middle component | |
| 409 * in the high 16 bits of a 32 bit word, and process all three RGB | |
| 410 * components at the same time. Since the smallest gap is here just | |
| 411 * 5 bits, we have to scale alpha down to 5 bits as well. | |
| 412 */ | |
| 413 #define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \ | |
| 414 do { \ | |
| 415 int i; \ | |
| 416 Uint16 *src = (Uint16 *)(from); \ | |
| 417 Uint16 *dst = (Uint16 *)(to); \ | |
|
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418 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 419 for(i = 0; i < (int)(length); i++) { \ |
| 420 Uint32 s = *src++; \ | |
| 421 Uint32 d = *dst; \ | |
| 422 s = (s | s << 16) & 0x07e0f81f; \ | |
| 423 d = (d | d << 16) & 0x07e0f81f; \ | |
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424 d += (s - d) * ALPHA >> 5; \ |
| 0 | 425 d &= 0x07e0f81f; \ |
| 426 *dst++ = d | d >> 16; \ | |
| 427 } \ | |
| 428 } while(0) | |
| 429 | |
| 430 #define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \ | |
| 431 do { \ | |
| 432 int i; \ | |
| 433 Uint16 *src = (Uint16 *)(from); \ | |
| 434 Uint16 *dst = (Uint16 *)(to); \ | |
|
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435 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 436 for(i = 0; i < (int)(length); i++) { \ |
| 437 Uint32 s = *src++; \ | |
| 438 Uint32 d = *dst; \ | |
| 439 s = (s | s << 16) & 0x03e07c1f; \ | |
| 440 d = (d | d << 16) & 0x03e07c1f; \ | |
|
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441 d += (s - d) * ALPHA >> 5; \ |
| 0 | 442 d &= 0x03e07c1f; \ |
| 443 *dst++ = d | d >> 16; \ | |
| 444 } \ | |
| 445 } while(0) | |
| 446 | |
| 447 /* | |
| 448 * The general slow catch-all function, for remaining depths and formats | |
| 449 */ | |
| 450 #define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \ | |
| 451 do { \ | |
| 452 int i; \ | |
| 453 Uint8 *src = from; \ | |
| 454 Uint8 *dst = to; \ | |
| 455 for(i = 0; i < (int)(length); i++) { \ | |
| 456 Uint32 s, d; \ | |
| 457 unsigned rs, gs, bs, rd, gd, bd; \ | |
| 458 switch(bpp) { \ | |
| 459 case 2: \ | |
| 460 s = *(Uint16 *)src; \ | |
| 461 d = *(Uint16 *)dst; \ | |
| 462 break; \ | |
| 463 case 3: \ | |
| 464 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 465 s = (src[0] << 16) | (src[1] << 8) | src[2]; \ | |
| 466 d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \ | |
| 467 } else { \ | |
| 468 s = (src[2] << 16) | (src[1] << 8) | src[0]; \ | |
| 469 d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \ | |
| 470 } \ | |
| 471 break; \ | |
| 472 case 4: \ | |
| 473 s = *(Uint32 *)src; \ | |
| 474 d = *(Uint32 *)dst; \ | |
| 475 break; \ | |
| 476 } \ | |
| 477 RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \ | |
| 478 RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \ | |
| 479 rd += (rs - rd) * alpha >> 8; \ | |
| 480 gd += (gs - gd) * alpha >> 8; \ | |
| 481 bd += (bs - bd) * alpha >> 8; \ | |
| 482 PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \ | |
| 483 switch(bpp) { \ | |
| 484 case 2: \ | |
| 485 *(Uint16 *)dst = d; \ | |
| 486 break; \ | |
| 487 case 3: \ | |
| 488 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 489 dst[0] = d >> 16; \ | |
| 490 dst[1] = d >> 8; \ | |
| 491 dst[2] = d; \ | |
| 492 } else { \ | |
| 493 dst[0] = d; \ | |
| 494 dst[1] = d >> 8; \ | |
| 495 dst[2] = d >> 16; \ | |
| 496 } \ | |
| 497 break; \ | |
| 498 case 4: \ | |
| 499 *(Uint32 *)dst = d; \ | |
| 500 break; \ | |
| 501 } \ | |
| 502 src += bpp; \ | |
| 503 dst += bpp; \ | |
| 504 } \ | |
| 505 } while(0) | |
| 506 | |
|
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507 #ifdef MMX_ASMBLIT |
| 0 | 508 |
|
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509 #define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha) \ |
|
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510 do { \ |
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511 Uint32 *srcp = (Uint32 *)(from); \ |
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512 Uint32 *dstp = (Uint32 *)(to); \ |
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513 int i = 0x00fefefe; \ |
|
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514 movd_m2r(*(&i), mm4); \ |
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515 punpckldq_r2r(mm4, mm4); \ |
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516 i = 0x00010101; \ |
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517 movd_m2r(*(&i), mm3); \ |
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518 punpckldq_r2r(mm3, mm3); \ |
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519 i = (int)(length); \ |
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520 if( i & 1 ) { \ |
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521 Uint32 s = *srcp++; \ |
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522 Uint32 d = *dstp; \ |
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523 *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ |
|
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524 + (s & d & 0x00010101); \ |
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525 i--; \ |
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526 } \ |
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527 for(; i > 0; --i) { \ |
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528 movq_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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529 movq_r2r(mm2, mm6); /* dst -> mm6 */ \ |
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530 movq_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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531 movq_r2r(mm1, mm5); /* src -> mm5 */ \ |
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532 pand_r2r(mm4, mm6); /* dst & 0x00fefefe -> mm6 */ \ |
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533 pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */ \ |
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534 paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */ \ |
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535 psrld_i2r(1, mm5); \ |
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536 pand_r2r(mm1, mm2); /* s & d -> mm2 */ \ |
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537 pand_r2r(mm3, mm2); /* s & d & 0x00010101 -> mm2 */ \ |
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538 paddd_r2r(mm5, mm2); \ |
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539 movq_r2m(mm2, (*dstp)); \ |
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540 dstp += 2; \ |
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541 srcp += 2; \ |
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542 i--; \ |
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543 } \ |
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544 emms(); \ |
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545 } while(0) |
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546 |
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547 #endif |
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548 |
| 0 | 549 /* |
| 550 * Special case: 50% alpha (alpha=128) | |
| 551 * This is treated specially because it can be optimized very well, and | |
| 552 * since it is good for many cases of semi-translucency. | |
| 553 * The theory is to do all three components at the same time: | |
| 554 * First zero the lowest bit of each component, which gives us room to | |
| 555 * add them. Then shift right and add the sum of the lowest bits. | |
| 556 */ | |
| 557 #define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \ | |
| 558 do { \ | |
| 559 int i; \ | |
| 560 Uint32 *src = (Uint32 *)(from); \ | |
| 561 Uint32 *dst = (Uint32 *)(to); \ | |
| 562 for(i = 0; i < (int)(length); i++) { \ | |
| 563 Uint32 s = *src++; \ | |
| 564 Uint32 d = *dst; \ | |
| 565 *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ | |
| 566 + (s & d & 0x00010101); \ | |
| 567 } \ | |
| 568 } while(0) | |
| 569 | |
| 570 /* | |
| 571 * For 16bpp, we can actually blend two pixels in parallel, if we take | |
| 572 * care to shift before we add, not after. | |
| 573 */ | |
| 574 | |
| 575 /* helper: blend a single 16 bit pixel at 50% */ | |
| 576 #define BLEND16_50(dst, src, mask) \ | |
| 577 do { \ | |
| 578 Uint32 s = *src++; \ | |
| 579 Uint32 d = *dst; \ | |
| 580 *dst++ = (((s & mask) + (d & mask)) >> 1) \ | |
| 581 + (s & d & (~mask & 0xffff)); \ | |
| 582 } while(0) | |
| 583 | |
| 584 /* basic 16bpp blender. mask is the pixels to keep when adding. */ | |
| 585 #define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \ | |
| 586 do { \ | |
| 587 unsigned n = (length); \ | |
| 588 Uint16 *src = (Uint16 *)(from); \ | |
| 589 Uint16 *dst = (Uint16 *)(to); \ | |
| 590 if(((unsigned long)src ^ (unsigned long)dst) & 3) { \ | |
| 591 /* source and destination not in phase, blit one by one */ \ | |
| 592 while(n--) \ | |
| 593 BLEND16_50(dst, src, mask); \ | |
| 594 } else { \ | |
| 595 if((unsigned long)src & 3) { \ | |
| 596 /* first odd pixel */ \ | |
| 597 BLEND16_50(dst, src, mask); \ | |
| 598 n--; \ | |
| 599 } \ | |
| 600 for(; n > 1; n -= 2) { \ | |
| 601 Uint32 s = *(Uint32 *)src; \ | |
| 602 Uint32 d = *(Uint32 *)dst; \ | |
| 603 *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \ | |
| 604 + ((d & (mask | mask << 16)) >> 1) \ | |
| 605 + (s & d & (~(mask | mask << 16))); \ | |
| 606 src += 2; \ | |
| 607 dst += 2; \ | |
| 608 } \ | |
| 609 if(n) \ | |
| 610 BLEND16_50(dst, src, mask); /* last odd pixel */ \ | |
| 611 } \ | |
| 612 } while(0) | |
| 613 | |
| 614 #define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \ | |
| 615 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de) | |
| 616 | |
| 617 #define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \ | |
| 618 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde) | |
| 619 | |
|
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620 #ifdef MMX_ASMBLIT |
| 0 | 621 |
| 622 #define CHOOSE_BLIT(blitter, alpha, fmt) \ | |
| 623 do { \ | |
| 624 if(alpha == 255) { \ | |
| 625 switch(fmt->BytesPerPixel) { \ | |
| 626 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ | |
| 627 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ | |
| 628 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ | |
| 629 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ | |
| 630 } \ | |
| 631 } else { \ | |
| 632 switch(fmt->BytesPerPixel) { \ | |
| 633 case 1: \ | |
| 634 /* No 8bpp alpha blitting */ \ | |
| 635 break; \ | |
| 636 \ | |
| 637 case 2: \ | |
| 638 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ | |
| 639 case 0xffff: \ | |
| 640 if(fmt->Gmask == 0x07e0 \ | |
| 641 || fmt->Rmask == 0x07e0 \ | |
| 642 || fmt->Bmask == 0x07e0) { \ | |
| 643 if(alpha == 128) \ | |
| 644 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ | |
| 645 else { \ | |
|
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646 if(SDL_HasMMX()) \ |
|
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647 blitter(2, Uint8, ALPHA_BLIT16_565MMX); \ |
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648 else \ |
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649 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
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650 } \ |
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651 } else \ |
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652 goto general16; \ |
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653 break; \ |
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654 \ |
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655 case 0x7fff: \ |
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656 if(fmt->Gmask == 0x03e0 \ |
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657 || fmt->Rmask == 0x03e0 \ |
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658 || fmt->Bmask == 0x03e0) { \ |
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659 if(alpha == 128) \ |
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660 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ |
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661 else { \ |
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662 if(SDL_HasMMX()) \ |
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663 blitter(2, Uint8, ALPHA_BLIT16_555MMX); \ |
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664 else \ |
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665 blitter(2, Uint8, ALPHA_BLIT16_555); \ |
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666 } \ |
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667 break; \ |
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668 } \ |
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669 /* fallthrough */ \ |
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670 \ |
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671 default: \ |
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672 general16: \ |
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673 blitter(2, Uint8, ALPHA_BLIT_ANY); \ |
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674 } \ |
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675 break; \ |
|
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676 \ |
|
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677 case 3: \ |
|
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678 blitter(3, Uint8, ALPHA_BLIT_ANY); \ |
|
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679 break; \ |
|
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680 \ |
|
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681 case 4: \ |
|
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682 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ |
|
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683 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ |
|
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684 || fmt->Bmask == 0xff00)) { \ |
|
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685 if(alpha == 128) \ |
|
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686 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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689
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687 if(SDL_HasMMX()) \ |
|
689
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688 blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\ |
|
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689 else \ |
|
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690 blitter(4, Uint16, ALPHA_BLIT32_888_50);\ |
|
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691 } \ |
|
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692 else \ |
|
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693 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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689
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|
694 if(SDL_HasMMX()) \ |
|
689
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695 blitter(4, Uint16, ALPHA_BLIT32_888MMX);\ |
|
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696 else \ |
|
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697 blitter(4, Uint16, ALPHA_BLIT32_888); \ |
|
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698 } \ |
|
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699 } else \ |
|
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700 blitter(4, Uint16, ALPHA_BLIT_ANY); \ |
|
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701 break; \ |
|
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702 } \ |
|
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703 } \ |
|
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704 } while(0) |
|
5bb080d35049
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705 |
|
5bb080d35049
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|
706 #else |
|
5bb080d35049
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707 |
|
5bb080d35049
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708 #define CHOOSE_BLIT(blitter, alpha, fmt) \ |
|
5bb080d35049
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709 do { \ |
|
5bb080d35049
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|
710 if(alpha == 255) { \ |
|
5bb080d35049
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711 switch(fmt->BytesPerPixel) { \ |
|
5bb080d35049
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712 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ |
|
5bb080d35049
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713 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ |
|
5bb080d35049
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714 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ |
|
5bb080d35049
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715 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ |
|
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716 } \ |
|
5bb080d35049
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717 } else { \ |
|
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718 switch(fmt->BytesPerPixel) { \ |
|
5bb080d35049
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|
719 case 1: \ |
|
5bb080d35049
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720 /* No 8bpp alpha blitting */ \ |
|
5bb080d35049
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|
721 break; \ |
|
5bb080d35049
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|
722 \ |
|
5bb080d35049
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|
723 case 2: \ |
|
5bb080d35049
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724 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ |
|
5bb080d35049
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|
725 case 0xffff: \ |
|
5bb080d35049
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|
726 if(fmt->Gmask == 0x07e0 \ |
|
5bb080d35049
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727 || fmt->Rmask == 0x07e0 \ |
|
5bb080d35049
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|
728 || fmt->Bmask == 0x07e0) { \ |
|
5bb080d35049
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|
729 if(alpha == 128) \ |
|
5bb080d35049
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|
730 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ |
|
5bb080d35049
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|
731 else { \ |
| 0 | 732 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
| 733 } \ | |
| 734 } else \ | |
| 735 goto general16; \ | |
| 736 break; \ | |
| 737 \ | |
| 738 case 0x7fff: \ | |
| 739 if(fmt->Gmask == 0x03e0 \ | |
| 740 || fmt->Rmask == 0x03e0 \ | |
| 741 || fmt->Bmask == 0x03e0) { \ | |
| 742 if(alpha == 128) \ | |
| 743 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ | |
| 744 else { \ | |
| 745 blitter(2, Uint8, ALPHA_BLIT16_555); \ | |
| 746 } \ | |
| 747 break; \ | |
| 748 } \ | |
| 749 /* fallthrough */ \ | |
| 750 \ | |
| 751 default: \ | |
| 752 general16: \ | |
| 753 blitter(2, Uint8, ALPHA_BLIT_ANY); \ | |
| 754 } \ | |
| 755 break; \ | |
| 756 \ | |
| 757 case 3: \ | |
| 758 blitter(3, Uint8, ALPHA_BLIT_ANY); \ | |
| 759 break; \ | |
| 760 \ | |
| 761 case 4: \ | |
| 762 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ | |
| 763 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ | |
| 764 || fmt->Bmask == 0xff00)) { \ | |
| 765 if(alpha == 128) \ | |
| 766 blitter(4, Uint16, ALPHA_BLIT32_888_50); \ | |
| 767 else \ | |
| 768 blitter(4, Uint16, ALPHA_BLIT32_888); \ | |
| 769 } else \ | |
| 770 blitter(4, Uint16, ALPHA_BLIT_ANY); \ | |
| 771 break; \ | |
| 772 } \ | |
| 773 } \ | |
| 774 } while(0) | |
| 775 | |
|
689
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Date: Tue, 19 Aug 2003 17:57:00 +0200
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diff
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|
776 #endif |
| 0 | 777 |
| 778 /* | |
| 779 * This takes care of the case when the surface is clipped on the left and/or | |
| 780 * right. Top clipping has already been taken care of. | |
| 781 */ | |
| 782 static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 783 Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha) | |
| 784 { | |
| 785 SDL_PixelFormat *fmt = dst->format; | |
| 786 | |
| 787 #define RLECLIPBLIT(bpp, Type, do_blit) \ | |
| 788 do { \ | |
| 789 int linecount = srcrect->h; \ | |
| 790 int ofs = 0; \ | |
| 791 int left = srcrect->x; \ | |
| 792 int right = left + srcrect->w; \ | |
| 793 dstbuf -= left * bpp; \ | |
| 794 for(;;) { \ | |
| 795 int run; \ | |
| 796 ofs += *(Type *)srcbuf; \ | |
| 797 run = ((Type *)srcbuf)[1]; \ | |
| 798 srcbuf += 2 * sizeof(Type); \ | |
| 799 if(run) { \ | |
| 800 /* clip to left and right borders */ \ | |
| 801 if(ofs < right) { \ | |
| 802 int start = 0; \ | |
| 803 int len = run; \ | |
| 804 int startcol; \ | |
| 805 if(left - ofs > 0) { \ | |
| 806 start = left - ofs; \ | |
| 807 len -= start; \ | |
| 808 if(len <= 0) \ | |
| 809 goto nocopy ## bpp ## do_blit; \ | |
| 810 } \ | |
| 811 startcol = ofs + start; \ | |
| 812 if(len > right - startcol) \ | |
| 813 len = right - startcol; \ | |
| 814 do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \ | |
| 815 len, bpp, alpha); \ | |
| 816 } \ | |
| 817 nocopy ## bpp ## do_blit: \ | |
| 818 srcbuf += run * bpp; \ | |
| 819 ofs += run; \ | |
| 820 } else if(!ofs) \ | |
| 821 break; \ | |
| 822 if(ofs == w) { \ | |
| 823 ofs = 0; \ | |
| 824 dstbuf += dst->pitch; \ | |
| 825 if(!--linecount) \ | |
| 826 break; \ | |
| 827 } \ | |
| 828 } \ | |
| 829 } while(0) | |
| 830 | |
| 831 CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); | |
| 832 | |
| 833 #undef RLECLIPBLIT | |
| 834 | |
| 835 } | |
| 836 | |
| 837 | |
| 838 /* blit a colorkeyed RLE surface */ | |
| 839 int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 840 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 841 { | |
| 842 Uint8 *dstbuf; | |
| 843 Uint8 *srcbuf; | |
| 844 int x, y; | |
| 845 int w = src->w; | |
| 846 unsigned alpha; | |
| 847 | |
| 848 /* Lock the destination if necessary */ | |
|
526
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|
849 if ( SDL_MUSTLOCK(dst) ) { |
|
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
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diff
changeset
|
850 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 851 return(-1); |
| 852 } | |
| 853 } | |
| 854 | |
| 855 /* Set up the source and destination pointers */ | |
| 856 x = dstrect->x; | |
| 857 y = dstrect->y; | |
|
526
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|
858 dstbuf = (Uint8 *)dst->pixels |
| 0 | 859 + y * dst->pitch + x * src->format->BytesPerPixel; |
| 860 srcbuf = (Uint8 *)src->map->sw_data->aux_data; | |
| 861 | |
| 862 { | |
| 863 /* skip lines at the top if neccessary */ | |
| 864 int vskip = srcrect->y; | |
| 865 int ofs = 0; | |
| 866 if(vskip) { | |
| 867 | |
| 868 #define RLESKIP(bpp, Type) \ | |
| 869 for(;;) { \ | |
| 870 int run; \ | |
| 871 ofs += *(Type *)srcbuf; \ | |
| 872 run = ((Type *)srcbuf)[1]; \ | |
| 873 srcbuf += sizeof(Type) * 2; \ | |
| 874 if(run) { \ | |
| 875 srcbuf += run * bpp; \ | |
| 876 ofs += run; \ | |
| 877 } else if(!ofs) \ | |
| 878 goto done; \ | |
| 879 if(ofs == w) { \ | |
| 880 ofs = 0; \ | |
| 881 if(!--vskip) \ | |
| 882 break; \ | |
| 883 } \ | |
| 884 } | |
| 885 | |
| 886 switch(src->format->BytesPerPixel) { | |
| 887 case 1: RLESKIP(1, Uint8); break; | |
| 888 case 2: RLESKIP(2, Uint8); break; | |
| 889 case 3: RLESKIP(3, Uint8); break; | |
| 890 case 4: RLESKIP(4, Uint16); break; | |
| 891 } | |
| 892 | |
| 893 #undef RLESKIP | |
| 894 | |
| 895 } | |
| 896 } | |
| 897 | |
| 898 alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 899 ? src->format->alpha : 255; | |
| 900 /* if left or right edge clipping needed, call clip blit */ | |
| 901 if ( srcrect->x || srcrect->w != src->w ) { | |
| 902 RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); | |
| 903 } else { | |
| 904 SDL_PixelFormat *fmt = src->format; | |
| 905 | |
| 906 #define RLEBLIT(bpp, Type, do_blit) \ | |
| 907 do { \ | |
| 908 int linecount = srcrect->h; \ | |
| 909 int ofs = 0; \ | |
| 910 for(;;) { \ | |
| 911 unsigned run; \ | |
| 912 ofs += *(Type *)srcbuf; \ | |
| 913 run = ((Type *)srcbuf)[1]; \ | |
| 914 srcbuf += 2 * sizeof(Type); \ | |
| 915 if(run) { \ | |
| 916 do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \ | |
| 917 srcbuf += run * bpp; \ | |
| 918 ofs += run; \ | |
| 919 } else if(!ofs) \ | |
| 920 break; \ | |
| 921 if(ofs == w) { \ | |
| 922 ofs = 0; \ | |
| 923 dstbuf += dst->pitch; \ | |
| 924 if(!--linecount) \ | |
| 925 break; \ | |
| 926 } \ | |
| 927 } \ | |
| 928 } while(0) | |
| 929 | |
| 930 CHOOSE_BLIT(RLEBLIT, alpha, fmt); | |
| 931 | |
| 932 #undef RLEBLIT | |
| 933 } | |
| 934 | |
| 935 done: | |
| 936 /* Unlock the destination if necessary */ | |
|
526
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|
937 if ( SDL_MUSTLOCK(dst) ) { |
|
4314a501d7be
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diff
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|
938 SDL_UnlockSurface(dst); |
| 0 | 939 } |
| 940 return(0); | |
| 941 } | |
| 942 | |
| 943 #undef OPAQUE_BLIT | |
| 944 | |
| 945 /* | |
| 946 * Per-pixel blitting macros for translucent pixels: | |
| 947 * These use the same techniques as the per-surface blitting macros | |
| 948 */ | |
| 949 | |
| 950 /* | |
| 951 * For 32bpp pixels, we have made sure the alpha is stored in the top | |
| 952 * 8 bits, so proceed as usual | |
| 953 */ | |
| 954 #define BLIT_TRANSL_888(src, dst) \ | |
| 955 do { \ | |
| 956 Uint32 s = src; \ | |
| 957 Uint32 d = dst; \ | |
| 958 unsigned alpha = s >> 24; \ | |
| 959 Uint32 s1 = s & 0xff00ff; \ | |
| 960 Uint32 d1 = d & 0xff00ff; \ | |
| 961 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 962 s &= 0xff00; \ | |
| 963 d &= 0xff00; \ | |
| 964 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 965 dst = d1 | d; \ | |
| 966 } while(0) | |
| 967 | |
| 968 /* | |
| 969 * For 16bpp pixels, we have stored the 5 most significant alpha bits in | |
| 970 * bits 5-10. As before, we can process all 3 RGB components at the same time. | |
| 971 */ | |
| 972 #define BLIT_TRANSL_565(src, dst) \ | |
| 973 do { \ | |
| 974 Uint32 s = src; \ | |
| 975 Uint32 d = dst; \ | |
| 976 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 977 s &= 0x07e0f81f; \ | |
| 978 d = (d | d << 16) & 0x07e0f81f; \ | |
| 979 d += (s - d) * alpha >> 5; \ | |
| 980 d &= 0x07e0f81f; \ | |
| 981 dst = d | d >> 16; \ | |
| 982 } while(0) | |
| 983 | |
| 984 #define BLIT_TRANSL_555(src, dst) \ | |
| 985 do { \ | |
| 986 Uint32 s = src; \ | |
| 987 Uint32 d = dst; \ | |
| 988 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 989 s &= 0x03e07c1f; \ | |
| 990 d = (d | d << 16) & 0x03e07c1f; \ | |
| 991 d += (s - d) * alpha >> 5; \ | |
| 992 d &= 0x03e07c1f; \ | |
| 993 dst = d | d >> 16; \ | |
| 994 } while(0) | |
| 995 | |
| 996 /* used to save the destination format in the encoding. Designed to be | |
| 997 macro-compatible with SDL_PixelFormat but without the unneeded fields */ | |
| 998 typedef struct { | |
| 999 Uint8 BytesPerPixel; | |
| 1000 Uint8 Rloss; | |
| 1001 Uint8 Gloss; | |
| 1002 Uint8 Bloss; | |
| 1003 Uint8 Rshift; | |
| 1004 Uint8 Gshift; | |
| 1005 Uint8 Bshift; | |
| 1006 Uint8 Ashift; | |
| 1007 Uint32 Rmask; | |
| 1008 Uint32 Gmask; | |
| 1009 Uint32 Bmask; | |
| 1010 Uint32 Amask; | |
| 1011 } RLEDestFormat; | |
| 1012 | |
| 1013 /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ | |
| 1014 static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 1015 Uint8 *dstbuf, SDL_Rect *srcrect) | |
| 1016 { | |
| 1017 SDL_PixelFormat *df = dst->format; | |
| 1018 /* | |
| 1019 * clipped blitter: Ptype is the destination pixel type, | |
| 1020 * Ctype the translucent count type, and do_blend the macro | |
| 1021 * to blend one pixel. | |
| 1022 */ | |
| 1023 #define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \ | |
| 1024 do { \ | |
| 1025 int linecount = srcrect->h; \ | |
| 1026 int left = srcrect->x; \ | |
| 1027 int right = left + srcrect->w; \ | |
| 1028 dstbuf -= left * sizeof(Ptype); \ | |
| 1029 do { \ | |
| 1030 int ofs = 0; \ | |
| 1031 /* blit opaque pixels on one line */ \ | |
| 1032 do { \ | |
| 1033 unsigned run; \ | |
| 1034 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1035 run = ((Ctype *)srcbuf)[1]; \ | |
| 1036 srcbuf += 2 * sizeof(Ctype); \ | |
| 1037 if(run) { \ | |
| 1038 /* clip to left and right borders */ \ | |
| 1039 int cofs = ofs; \ | |
| 1040 int crun = run; \ | |
| 1041 if(left - cofs > 0) { \ | |
| 1042 crun -= left - cofs; \ | |
| 1043 cofs = left; \ | |
| 1044 } \ | |
| 1045 if(crun > right - cofs) \ | |
| 1046 crun = right - cofs; \ | |
| 1047 if(crun > 0) \ | |
|
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|
1048 PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \ |
| 0 | 1049 srcbuf + (cofs - ofs) * sizeof(Ptype), \ |
|
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|
1050 (unsigned)crun, sizeof(Ptype)); \ |
| 0 | 1051 srcbuf += run * sizeof(Ptype); \ |
| 1052 ofs += run; \ | |
| 1053 } else if(!ofs) \ | |
| 1054 return; \ | |
| 1055 } while(ofs < w); \ | |
| 1056 /* skip padding if necessary */ \ | |
| 1057 if(sizeof(Ptype) == 2) \ | |
| 1058 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1059 /* blit translucent pixels on the same line */ \ | |
| 1060 ofs = 0; \ | |
| 1061 do { \ | |
| 1062 unsigned run; \ | |
| 1063 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1064 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1065 srcbuf += 4; \ | |
| 1066 if(run) { \ | |
| 1067 /* clip to left and right borders */ \ | |
| 1068 int cofs = ofs; \ | |
| 1069 int crun = run; \ | |
| 1070 if(left - cofs > 0) { \ | |
| 1071 crun -= left - cofs; \ | |
| 1072 cofs = left; \ | |
| 1073 } \ | |
| 1074 if(crun > right - cofs) \ | |
| 1075 crun = right - cofs; \ | |
| 1076 if(crun > 0) { \ | |
| 1077 Ptype *dst = (Ptype *)dstbuf + cofs; \ | |
| 1078 Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \ | |
| 1079 int i; \ | |
| 1080 for(i = 0; i < crun; i++) \ | |
| 1081 do_blend(src[i], dst[i]); \ | |
| 1082 } \ | |
| 1083 srcbuf += run * 4; \ | |
| 1084 ofs += run; \ | |
| 1085 } \ | |
| 1086 } while(ofs < w); \ | |
| 1087 dstbuf += dst->pitch; \ | |
| 1088 } while(--linecount); \ | |
| 1089 } while(0) | |
| 1090 | |
| 1091 switch(df->BytesPerPixel) { | |
| 1092 case 2: | |
| 1093 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1094 || df->Bmask == 0x07e0) | |
| 1095 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1096 else | |
| 1097 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1098 break; | |
| 1099 case 4: | |
| 1100 RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1101 break; | |
| 1102 } | |
| 1103 } | |
| 1104 | |
| 1105 /* blit a pixel-alpha RLE surface */ | |
| 1106 int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 1107 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 1108 { | |
| 1109 int x, y; | |
| 1110 int w = src->w; | |
| 1111 Uint8 *srcbuf, *dstbuf; | |
| 1112 SDL_PixelFormat *df = dst->format; | |
| 1113 | |
| 1114 /* Lock the destination if necessary */ | |
|
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|
1115 if ( SDL_MUSTLOCK(dst) ) { |
|
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|
1116 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 1117 return -1; |
| 1118 } | |
| 1119 } | |
| 1120 | |
| 1121 x = dstrect->x; | |
| 1122 y = dstrect->y; | |
|
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|
1123 dstbuf = (Uint8 *)dst->pixels |
| 0 | 1124 + y * dst->pitch + x * df->BytesPerPixel; |
| 1125 srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat); | |
| 1126 | |
| 1127 { | |
| 1128 /* skip lines at the top if necessary */ | |
| 1129 int vskip = srcrect->y; | |
| 1130 if(vskip) { | |
| 1131 int ofs; | |
| 1132 if(df->BytesPerPixel == 2) { | |
| 1133 /* the 16/32 interleaved format */ | |
| 1134 do { | |
| 1135 /* skip opaque line */ | |
| 1136 ofs = 0; | |
| 1137 do { | |
| 1138 int run; | |
| 1139 ofs += srcbuf[0]; | |
| 1140 run = srcbuf[1]; | |
| 1141 srcbuf += 2; | |
| 1142 if(run) { | |
| 1143 srcbuf += 2 * run; | |
| 1144 ofs += run; | |
| 1145 } else if(!ofs) | |
| 1146 goto done; | |
| 1147 } while(ofs < w); | |
| 1148 | |
| 1149 /* skip padding */ | |
| 1150 srcbuf += (unsigned long)srcbuf & 2; | |
| 1151 | |
| 1152 /* skip translucent line */ | |
| 1153 ofs = 0; | |
| 1154 do { | |
| 1155 int run; | |
| 1156 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1157 run = ((Uint16 *)srcbuf)[1]; | |
| 1158 srcbuf += 4 * (run + 1); | |
| 1159 ofs += run; | |
| 1160 } while(ofs < w); | |
| 1161 } while(--vskip); | |
| 1162 } else { | |
| 1163 /* the 32/32 interleaved format */ | |
| 1164 vskip <<= 1; /* opaque and translucent have same format */ | |
| 1165 do { | |
| 1166 ofs = 0; | |
| 1167 do { | |
| 1168 int run; | |
| 1169 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1170 run = ((Uint16 *)srcbuf)[1]; | |
| 1171 srcbuf += 4; | |
| 1172 if(run) { | |
| 1173 srcbuf += 4 * run; | |
| 1174 ofs += run; | |
| 1175 } else if(!ofs) | |
| 1176 goto done; | |
| 1177 } while(ofs < w); | |
| 1178 } while(--vskip); | |
| 1179 } | |
| 1180 } | |
| 1181 } | |
| 1182 | |
| 1183 /* if left or right edge clipping needed, call clip blit */ | |
| 1184 if(srcrect->x || srcrect->w != src->w) { | |
| 1185 RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect); | |
| 1186 } else { | |
| 1187 | |
| 1188 /* | |
| 1189 * non-clipped blitter. Ptype is the destination pixel type, | |
| 1190 * Ctype the translucent count type, and do_blend the | |
| 1191 * macro to blend one pixel. | |
| 1192 */ | |
| 1193 #define RLEALPHABLIT(Ptype, Ctype, do_blend) \ | |
| 1194 do { \ | |
| 1195 int linecount = srcrect->h; \ | |
| 1196 do { \ | |
| 1197 int ofs = 0; \ | |
| 1198 /* blit opaque pixels on one line */ \ | |
| 1199 do { \ | |
| 1200 unsigned run; \ | |
| 1201 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1202 run = ((Ctype *)srcbuf)[1]; \ | |
| 1203 srcbuf += 2 * sizeof(Ctype); \ | |
| 1204 if(run) { \ | |
|
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changeset
|
1205 PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \ |
|
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|
1206 run, sizeof(Ptype)); \ |
| 0 | 1207 srcbuf += run * sizeof(Ptype); \ |
| 1208 ofs += run; \ | |
| 1209 } else if(!ofs) \ | |
| 1210 goto done; \ | |
| 1211 } while(ofs < w); \ | |
| 1212 /* skip padding if necessary */ \ | |
| 1213 if(sizeof(Ptype) == 2) \ | |
| 1214 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1215 /* blit translucent pixels on the same line */ \ | |
| 1216 ofs = 0; \ | |
| 1217 do { \ | |
| 1218 unsigned run; \ | |
| 1219 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1220 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1221 srcbuf += 4; \ | |
| 1222 if(run) { \ | |
| 1223 Ptype *dst = (Ptype *)dstbuf + ofs; \ | |
| 1224 unsigned i; \ | |
| 1225 for(i = 0; i < run; i++) { \ | |
| 1226 Uint32 src = *(Uint32 *)srcbuf; \ | |
| 1227 do_blend(src, *dst); \ | |
| 1228 srcbuf += 4; \ | |
| 1229 dst++; \ | |
| 1230 } \ | |
| 1231 ofs += run; \ | |
| 1232 } \ | |
| 1233 } while(ofs < w); \ | |
| 1234 dstbuf += dst->pitch; \ | |
| 1235 } while(--linecount); \ | |
| 1236 } while(0) | |
| 1237 | |
| 1238 switch(df->BytesPerPixel) { | |
| 1239 case 2: | |
| 1240 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1241 || df->Bmask == 0x07e0) | |
| 1242 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1243 else | |
| 1244 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1245 break; | |
| 1246 case 4: | |
| 1247 RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1248 break; | |
| 1249 } | |
| 1250 } | |
| 1251 | |
| 1252 done: | |
| 1253 /* Unlock the destination if necessary */ | |
|
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|
1254 if ( SDL_MUSTLOCK(dst) ) { |
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|
1255 SDL_UnlockSurface(dst); |
| 0 | 1256 } |
| 1257 return 0; | |
| 1258 } | |
| 1259 | |
| 1260 /* | |
| 1261 * Auxiliary functions: | |
| 1262 * The encoding functions take 32bpp rgb + a, and | |
| 1263 * return the number of bytes copied to the destination. | |
| 1264 * The decoding functions copy to 32bpp rgb + a, and | |
| 1265 * return the number of bytes copied from the source. | |
| 1266 * These are only used in the encoder and un-RLE code and are therefore not | |
| 1267 * highly optimised. | |
| 1268 */ | |
| 1269 | |
| 1270 /* encode 32bpp rgb + a into 16bpp rgb, losing alpha */ | |
| 1271 static int copy_opaque_16(void *dst, Uint32 *src, int n, | |
| 1272 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1273 { | |
| 1274 int i; | |
| 1275 Uint16 *d = dst; | |
| 1276 for(i = 0; i < n; i++) { | |
| 1277 unsigned r, g, b; | |
| 1278 RGB_FROM_PIXEL(*src, sfmt, r, g, b); | |
| 1279 PIXEL_FROM_RGB(*d, dfmt, r, g, b); | |
| 1280 src++; | |
| 1281 d++; | |
| 1282 } | |
| 1283 return n * 2; | |
| 1284 } | |
| 1285 | |
| 1286 /* decode opaque pixels from 16bpp to 32bpp rgb + a */ | |
| 1287 static int uncopy_opaque_16(Uint32 *dst, void *src, int n, | |
| 1288 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1289 { | |
| 1290 int i; | |
| 1291 Uint16 *s = src; | |
| 1292 unsigned alpha = dfmt->Amask ? 255 : 0; | |
| 1293 for(i = 0; i < n; i++) { | |
| 1294 unsigned r, g, b; | |
| 1295 RGB_FROM_PIXEL(*s, sfmt, r, g, b); | |
| 1296 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha); | |
| 1297 s++; | |
| 1298 dst++; | |
| 1299 } | |
| 1300 return n * 2; | |
| 1301 } | |
| 1302 | |
| 1303 | |
| 1304 | |
| 1305 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */ | |
| 1306 static int copy_transl_565(void *dst, Uint32 *src, int n, | |
| 1307 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1308 { | |
| 1309 int i; | |
| 1310 Uint32 *d = dst; | |
| 1311 for(i = 0; i < n; i++) { | |
| 1312 unsigned r, g, b, a; | |
| 1313 Uint16 pix; | |
| 1314 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1315 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1316 *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0); | |
| 1317 src++; | |
| 1318 d++; | |
| 1319 } | |
| 1320 return n * 4; | |
| 1321 } | |
| 1322 | |
| 1323 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */ | |
| 1324 static int copy_transl_555(void *dst, Uint32 *src, int n, | |
| 1325 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1326 { | |
| 1327 int i; | |
| 1328 Uint32 *d = dst; | |
| 1329 for(i = 0; i < n; i++) { | |
| 1330 unsigned r, g, b, a; | |
| 1331 Uint16 pix; | |
| 1332 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1333 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1334 *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0); | |
| 1335 src++; | |
| 1336 d++; | |
| 1337 } | |
| 1338 return n * 4; | |
| 1339 } | |
| 1340 | |
| 1341 /* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */ | |
| 1342 static int uncopy_transl_16(Uint32 *dst, void *src, int n, | |
| 1343 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1344 { | |
| 1345 int i; | |
| 1346 Uint32 *s = src; | |
| 1347 for(i = 0; i < n; i++) { | |
| 1348 unsigned r, g, b, a; | |
| 1349 Uint32 pix = *s++; | |
| 1350 a = (pix & 0x3e0) >> 2; | |
| 1351 pix = (pix & ~0x3e0) | pix >> 16; | |
| 1352 RGB_FROM_PIXEL(pix, sfmt, r, g, b); | |
| 1353 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1354 dst++; | |
| 1355 } | |
| 1356 return n * 4; | |
| 1357 } | |
| 1358 | |
| 1359 /* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1360 static int copy_32(void *dst, Uint32 *src, int n, | |
| 1361 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1362 { | |
| 1363 int i; | |
| 1364 Uint32 *d = dst; | |
| 1365 for(i = 0; i < n; i++) { | |
| 1366 unsigned r, g, b, a; | |
| 1367 Uint32 pixel; | |
| 1368 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1369 PIXEL_FROM_RGB(pixel, dfmt, r, g, b); | |
| 1370 *d++ = pixel | a << 24; | |
| 1371 src++; | |
| 1372 } | |
| 1373 return n * 4; | |
| 1374 } | |
| 1375 | |
| 1376 /* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1377 static int uncopy_32(Uint32 *dst, void *src, int n, | |
| 1378 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1379 { | |
| 1380 int i; | |
| 1381 Uint32 *s = src; | |
| 1382 for(i = 0; i < n; i++) { | |
| 1383 unsigned r, g, b, a; | |
| 1384 Uint32 pixel = *s++; | |
| 1385 RGB_FROM_PIXEL(pixel, sfmt, r, g, b); | |
| 1386 a = pixel >> 24; | |
| 1387 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1388 dst++; | |
| 1389 } | |
| 1390 return n * 4; | |
| 1391 } | |
| 1392 | |
| 1393 #define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255) | |
| 1394 | |
| 1395 #define ISTRANSL(pixel, fmt) \ | |
| 1396 ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U) | |
| 1397 | |
| 1398 /* convert surface to be quickly alpha-blittable onto dest, if possible */ | |
| 1399 static int RLEAlphaSurface(SDL_Surface *surface) | |
| 1400 { | |
| 1401 SDL_Surface *dest; | |
| 1402 SDL_PixelFormat *df; | |
| 1403 int maxsize = 0; | |
| 1404 int max_opaque_run; | |
| 1405 int max_transl_run = 65535; | |
| 1406 unsigned masksum; | |
| 1407 Uint8 *rlebuf, *dst; | |
| 1408 int (*copy_opaque)(void *, Uint32 *, int, | |
| 1409 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1410 int (*copy_transl)(void *, Uint32 *, int, | |
| 1411 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1412 | |
| 1413 dest = surface->map->dst; | |
| 1414 if(!dest) | |
| 1415 return -1; | |
| 1416 df = dest->format; | |
| 1417 if(surface->format->BitsPerPixel != 32) | |
| 1418 return -1; /* only 32bpp source supported */ | |
| 1419 | |
| 1420 /* find out whether the destination is one we support, | |
| 1421 and determine the max size of the encoded result */ | |
| 1422 masksum = df->Rmask | df->Gmask | df->Bmask; | |
| 1423 switch(df->BytesPerPixel) { | |
| 1424 case 2: | |
| 1425 /* 16bpp: only support 565 and 555 formats */ | |
| 1426 switch(masksum) { | |
| 1427 case 0xffff: | |
| 1428 if(df->Gmask == 0x07e0 | |
| 1429 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) { | |
| 1430 copy_opaque = copy_opaque_16; | |
| 1431 copy_transl = copy_transl_565; | |
| 1432 } else | |
| 1433 return -1; | |
| 1434 break; | |
| 1435 case 0x7fff: | |
| 1436 if(df->Gmask == 0x03e0 | |
| 1437 || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) { | |
| 1438 copy_opaque = copy_opaque_16; | |
| 1439 copy_transl = copy_transl_555; | |
| 1440 } else | |
| 1441 return -1; | |
| 1442 break; | |
| 1443 default: | |
| 1444 return -1; | |
| 1445 } | |
| 1446 max_opaque_run = 255; /* runs stored as bytes */ | |
| 1447 | |
| 1448 /* worst case is alternating opaque and translucent pixels, | |
| 1449 with room for alignment padding between lines */ | |
| 1450 maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2; | |
| 1451 break; | |
| 1452 case 4: | |
| 1453 if(masksum != 0x00ffffff) | |
| 1454 return -1; /* requires unused high byte */ | |
| 1455 copy_opaque = copy_32; | |
| 1456 copy_transl = copy_32; | |
| 1457 max_opaque_run = 255; /* runs stored as short ints */ | |
| 1458 | |
| 1459 /* worst case is alternating opaque and translucent pixels */ | |
| 1460 maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4; | |
| 1461 break; | |
| 1462 default: | |
| 1463 return -1; /* anything else unsupported right now */ | |
| 1464 } | |
| 1465 | |
| 1466 maxsize += sizeof(RLEDestFormat); | |
|
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1330
diff
changeset
|
1467 rlebuf = (Uint8 *)SDL_malloc(maxsize); |
| 0 | 1468 if(!rlebuf) { |
| 1469 SDL_OutOfMemory(); | |
| 1470 return -1; | |
| 1471 } | |
| 1472 { | |
| 1473 /* save the destination format so we can undo the encoding later */ | |
| 1474 RLEDestFormat *r = (RLEDestFormat *)rlebuf; | |
| 1475 r->BytesPerPixel = df->BytesPerPixel; | |
| 1476 r->Rloss = df->Rloss; | |
| 1477 r->Gloss = df->Gloss; | |
| 1478 r->Bloss = df->Bloss; | |
| 1479 r->Rshift = df->Rshift; | |
| 1480 r->Gshift = df->Gshift; | |
| 1481 r->Bshift = df->Bshift; | |
| 1482 r->Ashift = df->Ashift; | |
| 1483 r->Rmask = df->Rmask; | |
| 1484 r->Gmask = df->Gmask; | |
| 1485 r->Bmask = df->Bmask; | |
| 1486 r->Amask = df->Amask; | |
| 1487 } | |
| 1488 dst = rlebuf + sizeof(RLEDestFormat); | |
| 1489 | |
| 1490 /* Do the actual encoding */ | |
| 1491 { | |
| 1492 int x, y; | |
| 1493 int h = surface->h, w = surface->w; | |
| 1494 SDL_PixelFormat *sf = surface->format; | |
|
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changeset
|
1495 Uint32 *src = (Uint32 *)surface->pixels; |
| 0 | 1496 Uint8 *lastline = dst; /* end of last non-blank line */ |
| 1497 | |
| 1498 /* opaque counts are 8 or 16 bits, depending on target depth */ | |
| 1499 #define ADD_OPAQUE_COUNTS(n, m) \ | |
| 1500 if(df->BytesPerPixel == 4) { \ | |
| 1501 ((Uint16 *)dst)[0] = n; \ | |
| 1502 ((Uint16 *)dst)[1] = m; \ | |
| 1503 dst += 4; \ | |
| 1504 } else { \ | |
| 1505 dst[0] = n; \ | |
| 1506 dst[1] = m; \ | |
| 1507 dst += 2; \ | |
| 1508 } | |
| 1509 | |
| 1510 /* translucent counts are always 16 bit */ | |
| 1511 #define ADD_TRANSL_COUNTS(n, m) \ | |
| 1512 (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4) | |
| 1513 | |
| 1514 for(y = 0; y < h; y++) { | |
| 1515 int runstart, skipstart; | |
| 1516 int blankline = 0; | |
| 1517 /* First encode all opaque pixels of a scan line */ | |
| 1518 x = 0; | |
| 1519 do { | |
| 1520 int run, skip, len; | |
| 1521 skipstart = x; | |
| 1522 while(x < w && !ISOPAQUE(src[x], sf)) | |
| 1523 x++; | |
| 1524 runstart = x; | |
| 1525 while(x < w && ISOPAQUE(src[x], sf)) | |
| 1526 x++; | |
| 1527 skip = runstart - skipstart; | |
| 1528 if(skip == w) | |
| 1529 blankline = 1; | |
| 1530 run = x - runstart; | |
| 1531 while(skip > max_opaque_run) { | |
| 1532 ADD_OPAQUE_COUNTS(max_opaque_run, 0); | |
| 1533 skip -= max_opaque_run; | |
| 1534 } | |
| 1535 len = MIN(run, max_opaque_run); | |
| 1536 ADD_OPAQUE_COUNTS(skip, len); | |
| 1537 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1538 runstart += len; | |
| 1539 run -= len; | |
| 1540 while(run) { | |
| 1541 len = MIN(run, max_opaque_run); | |
| 1542 ADD_OPAQUE_COUNTS(0, len); | |
| 1543 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1544 runstart += len; | |
| 1545 run -= len; | |
| 1546 } | |
| 1547 } while(x < w); | |
| 1548 | |
| 1549 /* Make sure the next output address is 32-bit aligned */ | |
| 1550 dst += (unsigned long)dst & 2; | |
| 1551 | |
| 1552 /* Next, encode all translucent pixels of the same scan line */ | |
| 1553 x = 0; | |
| 1554 do { | |
| 1555 int run, skip, len; | |
| 1556 skipstart = x; | |
| 1557 while(x < w && !ISTRANSL(src[x], sf)) | |
| 1558 x++; | |
| 1559 runstart = x; | |
| 1560 while(x < w && ISTRANSL(src[x], sf)) | |
| 1561 x++; | |
| 1562 skip = runstart - skipstart; | |
| 1563 blankline &= (skip == w); | |
| 1564 run = x - runstart; | |
| 1565 while(skip > max_transl_run) { | |
| 1566 ADD_TRANSL_COUNTS(max_transl_run, 0); | |
| 1567 skip -= max_transl_run; | |
| 1568 } | |
| 1569 len = MIN(run, max_transl_run); | |
| 1570 ADD_TRANSL_COUNTS(skip, len); | |
| 1571 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1572 runstart += len; | |
| 1573 run -= len; | |
| 1574 while(run) { | |
| 1575 len = MIN(run, max_transl_run); | |
| 1576 ADD_TRANSL_COUNTS(0, len); | |
| 1577 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1578 runstart += len; | |
| 1579 run -= len; | |
| 1580 } | |
| 1581 if(!blankline) | |
| 1582 lastline = dst; | |
| 1583 } while(x < w); | |
| 1584 | |
| 1585 src += surface->pitch >> 2; | |
| 1586 } | |
| 1587 dst = lastline; /* back up past trailing blank lines */ | |
| 1588 ADD_OPAQUE_COUNTS(0, 0); | |
| 1589 } | |
| 1590 | |
| 1591 #undef ADD_OPAQUE_COUNTS | |
| 1592 #undef ADD_TRANSL_COUNTS | |
| 1593 | |
| 1594 /* Now that we have it encoded, release the original pixels */ | |
| 1595 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1596 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
|
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|
1597 SDL_free( surface->pixels ); |
| 0 | 1598 surface->pixels = NULL; |
| 1599 } | |
| 1600 | |
| 1601 /* realloc the buffer to release unused memory */ | |
| 1602 { | |
|
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|
1603 Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf); |
| 0 | 1604 if(!p) |
| 1605 p = rlebuf; | |
| 1606 surface->map->sw_data->aux_data = p; | |
| 1607 } | |
| 1608 | |
| 1609 return 0; | |
| 1610 } | |
| 1611 | |
| 1612 static Uint32 getpix_8(Uint8 *srcbuf) | |
| 1613 { | |
| 1614 return *srcbuf; | |
| 1615 } | |
| 1616 | |
| 1617 static Uint32 getpix_16(Uint8 *srcbuf) | |
| 1618 { | |
| 1619 return *(Uint16 *)srcbuf; | |
| 1620 } | |
| 1621 | |
| 1622 static Uint32 getpix_24(Uint8 *srcbuf) | |
| 1623 { | |
|
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Fixed some compiler warnings about "unreachable code" on Watcom C.
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parents:
944
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|
1624 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
|
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|
1625 return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16); |
|
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Fixed some compiler warnings about "unreachable code" on Watcom C.
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|
1626 #else |
|
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Fixed some compiler warnings about "unreachable code" on Watcom C.
Ryan C. Gordon <icculus@icculus.org>
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|
1627 return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2]; |
|
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|
1628 #endif |
| 0 | 1629 } |
| 1630 | |
| 1631 static Uint32 getpix_32(Uint8 *srcbuf) | |
| 1632 { | |
| 1633 return *(Uint32 *)srcbuf; | |
| 1634 } | |
| 1635 | |
| 1636 typedef Uint32 (*getpix_func)(Uint8 *); | |
| 1637 | |
| 1638 static getpix_func getpixes[4] = { | |
| 1639 getpix_8, getpix_16, getpix_24, getpix_32 | |
| 1640 }; | |
| 1641 | |
| 1642 static int RLEColorkeySurface(SDL_Surface *surface) | |
| 1643 { | |
| 1644 Uint8 *rlebuf, *dst; | |
| 1645 int maxn; | |
| 1646 int y; | |
| 1647 Uint8 *srcbuf, *curbuf, *lastline; | |
| 1648 int maxsize = 0; | |
| 1649 int skip, run; | |
| 1650 int bpp = surface->format->BytesPerPixel; | |
| 1651 getpix_func getpix; | |
| 1652 Uint32 ckey, rgbmask; | |
| 1653 int w, h; | |
| 1654 | |
| 1655 /* calculate the worst case size for the compressed surface */ | |
| 1656 switch(bpp) { | |
| 1657 case 1: | |
| 1658 /* worst case is alternating opaque and transparent pixels, | |
| 1659 starting with an opaque pixel */ | |
| 1660 maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2; | |
| 1661 break; | |
| 1662 case 2: | |
| 1663 case 3: | |
| 1664 /* worst case is solid runs, at most 255 pixels wide */ | |
| 1665 maxsize = surface->h * (2 * (surface->w / 255 + 1) | |
| 1666 + surface->w * bpp) + 2; | |
| 1667 break; | |
| 1668 case 4: | |
| 1669 /* worst case is solid runs, at most 65535 pixels wide */ | |
| 1670 maxsize = surface->h * (4 * (surface->w / 65535 + 1) | |
| 1671 + surface->w * 4) + 4; | |
| 1672 break; | |
| 1673 } | |
| 1674 | |
|
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|
1675 rlebuf = (Uint8 *)SDL_malloc(maxsize); |
| 0 | 1676 if ( rlebuf == NULL ) { |
| 1677 SDL_OutOfMemory(); | |
| 1678 return(-1); | |
| 1679 } | |
| 1680 | |
| 1681 /* Set up the conversion */ | |
|
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Fixed a crash blitting RLE surfaces to RLE surfaces
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parents:
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diff
changeset
|
1682 srcbuf = (Uint8 *)surface->pixels; |
| 0 | 1683 curbuf = srcbuf; |
| 1684 maxn = bpp == 4 ? 65535 : 255; | |
| 1685 skip = run = 0; | |
| 1686 dst = rlebuf; | |
| 1687 rgbmask = ~surface->format->Amask; | |
| 1688 ckey = surface->format->colorkey & rgbmask; | |
| 1689 lastline = dst; | |
| 1690 getpix = getpixes[bpp - 1]; | |
| 1691 w = surface->w; | |
| 1692 h = surface->h; | |
| 1693 | |
| 1694 #define ADD_COUNTS(n, m) \ | |
| 1695 if(bpp == 4) { \ | |
| 1696 ((Uint16 *)dst)[0] = n; \ | |
| 1697 ((Uint16 *)dst)[1] = m; \ | |
| 1698 dst += 4; \ | |
| 1699 } else { \ | |
| 1700 dst[0] = n; \ | |
| 1701 dst[1] = m; \ | |
| 1702 dst += 2; \ | |
| 1703 } | |
| 1704 | |
| 1705 for(y = 0; y < h; y++) { | |
| 1706 int x = 0; | |
| 1707 int blankline = 0; | |
| 1708 do { | |
| 1709 int run, skip, len; | |
| 1710 int runstart; | |
| 1711 int skipstart = x; | |
| 1712 | |
| 1713 /* find run of transparent, then opaque pixels */ | |
| 1714 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey) | |
| 1715 x++; | |
| 1716 runstart = x; | |
| 1717 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey) | |
| 1718 x++; | |
| 1719 skip = runstart - skipstart; | |
| 1720 if(skip == w) | |
| 1721 blankline = 1; | |
| 1722 run = x - runstart; | |
| 1723 | |
| 1724 /* encode segment */ | |
| 1725 while(skip > maxn) { | |
| 1726 ADD_COUNTS(maxn, 0); | |
| 1727 skip -= maxn; | |
| 1728 } | |
| 1729 len = MIN(run, maxn); | |
| 1730 ADD_COUNTS(skip, len); | |
|
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parents:
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diff
changeset
|
1731 SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp); |
| 0 | 1732 dst += len * bpp; |
| 1733 run -= len; | |
| 1734 runstart += len; | |
| 1735 while(run) { | |
| 1736 len = MIN(run, maxn); | |
| 1737 ADD_COUNTS(0, len); | |
|
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diff
changeset
|
1738 SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp); |
| 0 | 1739 dst += len * bpp; |
| 1740 runstart += len; | |
| 1741 run -= len; | |
| 1742 } | |
| 1743 if(!blankline) | |
| 1744 lastline = dst; | |
| 1745 } while(x < w); | |
| 1746 | |
| 1747 srcbuf += surface->pitch; | |
| 1748 } | |
| 1749 dst = lastline; /* back up bast trailing blank lines */ | |
| 1750 ADD_COUNTS(0, 0); | |
| 1751 | |
| 1752 #undef ADD_COUNTS | |
| 1753 | |
| 1754 /* Now that we have it encoded, release the original pixels */ | |
| 1755 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1756 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
|
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|
1757 SDL_free( surface->pixels ); |
| 0 | 1758 surface->pixels = NULL; |
| 1759 } | |
| 1760 | |
| 1761 /* realloc the buffer to release unused memory */ | |
| 1762 { | |
| 1763 /* If realloc returns NULL, the original block is left intact */ | |
|
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|
1764 Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf); |
| 0 | 1765 if(!p) |
| 1766 p = rlebuf; | |
| 1767 surface->map->sw_data->aux_data = p; | |
| 1768 } | |
| 1769 | |
| 1770 return(0); | |
| 1771 } | |
| 1772 | |
| 1773 int SDL_RLESurface(SDL_Surface *surface) | |
| 1774 { | |
| 1775 int retcode; | |
| 1776 | |
| 1777 /* Clear any previous RLE conversion */ | |
| 1778 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1779 SDL_UnRLESurface(surface, 1); | |
| 1780 } | |
| 1781 | |
| 1782 /* We don't support RLE encoding of bitmaps */ | |
| 1783 if ( surface->format->BitsPerPixel < 8 ) { | |
| 1784 return(-1); | |
| 1785 } | |
| 1786 | |
| 1787 /* Lock the surface if it's in hardware */ | |
|
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Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
|
1788 if ( SDL_MUSTLOCK(surface) ) { |
|
4314a501d7be
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Sam Lantinga <slouken@libsdl.org>
parents:
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changeset
|
1789 if ( SDL_LockSurface(surface) < 0 ) { |
| 0 | 1790 return(-1); |
| 1791 } | |
| 1792 } | |
| 1793 | |
| 1794 /* Encode */ | |
| 1795 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1796 retcode = RLEColorkeySurface(surface); | |
| 1797 } else { | |
| 1798 if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 1799 && surface->format->Amask != 0) | |
| 1800 retcode = RLEAlphaSurface(surface); | |
| 1801 else | |
| 1802 retcode = -1; /* no RLE for per-surface alpha sans ckey */ | |
| 1803 } | |
| 1804 | |
| 1805 /* Unlock the surface if it's in hardware */ | |
|
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parents:
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diff
changeset
|
1806 if ( SDL_MUSTLOCK(surface) ) { |
|
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changeset
|
1807 SDL_UnlockSurface(surface); |
| 0 | 1808 } |
| 1809 | |
| 1810 if(retcode < 0) | |
| 1811 return -1; | |
| 1812 | |
| 1813 /* The surface is now accelerated */ | |
| 1814 surface->flags |= SDL_RLEACCEL; | |
| 1815 | |
| 1816 return(0); | |
| 1817 } | |
| 1818 | |
| 1819 /* | |
| 1820 * Un-RLE a surface with pixel alpha | |
| 1821 * This may not give back exactly the image before RLE-encoding; all | |
| 1822 * completely transparent pixels will be lost, and colour and alpha depth | |
| 1823 * may have been reduced (when encoding for 16bpp targets). | |
| 1824 */ | |
|
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Date: Wed, 28 Jul 2004 14:56:57 +0800
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parents:
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diff
changeset
|
1825 static SDL_bool UnRLEAlpha(SDL_Surface *surface) |
| 0 | 1826 { |
| 1827 Uint8 *srcbuf; | |
| 1828 Uint32 *dst; | |
| 1829 SDL_PixelFormat *sf = surface->format; | |
| 1830 RLEDestFormat *df = surface->map->sw_data->aux_data; | |
| 1831 int (*uncopy_opaque)(Uint32 *, void *, int, | |
| 1832 RLEDestFormat *, SDL_PixelFormat *); | |
| 1833 int (*uncopy_transl)(Uint32 *, void *, int, | |
| 1834 RLEDestFormat *, SDL_PixelFormat *); | |
| 1835 int w = surface->w; | |
| 1836 int bpp = df->BytesPerPixel; | |
| 1837 | |
| 1838 if(bpp == 2) { | |
| 1839 uncopy_opaque = uncopy_opaque_16; | |
| 1840 uncopy_transl = uncopy_transl_16; | |
| 1841 } else { | |
| 1842 uncopy_opaque = uncopy_transl = uncopy_32; | |
| 1843 } | |
| 1844 | |
|
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|
1845 surface->pixels = SDL_malloc(surface->h * surface->pitch); |
|
944
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Date: Wed, 28 Jul 2004 14:56:57 +0800
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diff
changeset
|
1846 if ( !surface->pixels ) { |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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diff
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|
1847 return(SDL_FALSE); |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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parents:
880
diff
changeset
|
1848 } |
| 0 | 1849 /* fill background with transparent pixels */ |
|
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|
1850 SDL_memset(surface->pixels, 0, surface->h * surface->pitch); |
| 0 | 1851 |
| 1852 dst = surface->pixels; | |
| 1853 srcbuf = (Uint8 *)(df + 1); | |
| 1854 for(;;) { | |
| 1855 /* copy opaque pixels */ | |
| 1856 int ofs = 0; | |
| 1857 do { | |
| 1858 unsigned run; | |
| 1859 if(bpp == 2) { | |
| 1860 ofs += srcbuf[0]; | |
| 1861 run = srcbuf[1]; | |
| 1862 srcbuf += 2; | |
| 1863 } else { | |
| 1864 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1865 run = ((Uint16 *)srcbuf)[1]; | |
| 1866 srcbuf += 4; | |
| 1867 } | |
| 1868 if(run) { | |
| 1869 srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf); | |
| 1870 ofs += run; | |
| 1871 } else if(!ofs) | |
|
944
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diff
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|
1872 return(SDL_TRUE); |
| 0 | 1873 } while(ofs < w); |
| 1874 | |
| 1875 /* skip padding if needed */ | |
| 1876 if(bpp == 2) | |
| 1877 srcbuf += (unsigned long)srcbuf & 2; | |
| 1878 | |
| 1879 /* copy translucent pixels */ | |
| 1880 ofs = 0; | |
| 1881 do { | |
| 1882 unsigned run; | |
| 1883 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1884 run = ((Uint16 *)srcbuf)[1]; | |
| 1885 srcbuf += 4; | |
| 1886 if(run) { | |
| 1887 srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf); | |
| 1888 ofs += run; | |
| 1889 } | |
| 1890 } while(ofs < w); | |
| 1891 dst += surface->pitch >> 2; | |
| 1892 } | |
|
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|
1893 /* Make the compiler happy */ |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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diff
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|
1894 return(SDL_TRUE); |
| 0 | 1895 } |
| 1896 | |
| 1897 void SDL_UnRLESurface(SDL_Surface *surface, int recode) | |
| 1898 { | |
| 1899 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1900 surface->flags &= ~SDL_RLEACCEL; | |
| 1901 | |
| 1902 if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1903 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1904 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1905 SDL_Rect full; | |
| 1906 unsigned alpha_flag; | |
| 1907 | |
| 1908 /* re-create the original surface */ | |
|
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|
1909 surface->pixels = SDL_malloc(surface->h * surface->pitch); |
|
944
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diff
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|
1910 if ( !surface->pixels ) { |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
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1911 /* Oh crap... */ |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
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1912 surface->flags |= SDL_RLEACCEL; |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1913 return; |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1914 } |
| 0 | 1915 |
| 1916 /* fill it with the background colour */ | |
| 1917 SDL_FillRect(surface, NULL, surface->format->colorkey); | |
| 1918 | |
| 1919 /* now render the encoded surface */ | |
| 1920 full.x = full.y = 0; | |
| 1921 full.w = surface->w; | |
| 1922 full.h = surface->h; | |
| 1923 alpha_flag = surface->flags & SDL_SRCALPHA; | |
| 1924 surface->flags &= ~SDL_SRCALPHA; /* opaque blit */ | |
| 1925 SDL_RLEBlit(surface, &full, surface, &full); | |
| 1926 surface->flags |= alpha_flag; | |
|
944
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
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1927 } else { |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1928 if ( !UnRLEAlpha(surface) ) { |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1929 /* Oh crap... */ |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1930 surface->flags |= SDL_RLEACCEL; |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1931 return; |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1932 } |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1933 } |
| 0 | 1934 } |
| 1935 | |
| 1936 if ( surface->map && surface->map->sw_data->aux_data ) { | |
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1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
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1330
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1937 SDL_free(surface->map->sw_data->aux_data); |
| 0 | 1938 surface->map->sw_data->aux_data = NULL; |
| 1939 } | |
| 1940 } | |
| 1941 } | |
| 1942 | |
| 1943 |