Mercurial > sdl-ios-xcode
annotate src/video/SDL_RLEaccel.c @ 1381:8570e1f4b1f1
On FreeBSD, alloca is defined in stdlib.h
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Feb 2006 02:30:15 +0000 |
| parents | 19418e4422cb |
| children | d910939febfa |
| 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 */ |
| 22 | |
| 23 /* | |
| 24 * RLE encoding for software colorkey and alpha-channel acceleration | |
| 25 * | |
| 26 * Original version by Sam Lantinga | |
| 27 * | |
| 28 * Mattias Engdegård (Yorick): Rewrite. New encoding format, encoder and | |
| 29 * decoder. Added per-surface alpha blitter. Added per-pixel alpha | |
| 30 * format, encoder and blitter. | |
| 31 * | |
| 32 * Many thanks to Xark and johns for hints, benchmarks and useful comments | |
| 33 * leading to this code. | |
| 34 * | |
| 35 * Welcome to Macro Mayhem. | |
| 36 */ | |
| 37 | |
| 38 /* | |
| 39 * The encoding translates the image data to a stream of segments of the form | |
| 40 * | |
| 41 * <skip> <run> <data> | |
| 42 * | |
| 43 * where <skip> is the number of transparent pixels to skip, | |
| 44 * <run> is the number of opaque pixels to blit, | |
| 45 * and <data> are the pixels themselves. | |
| 46 * | |
| 47 * This basic structure is used both for colorkeyed surfaces, used for simple | |
| 48 * binary transparency and for per-surface alpha blending, and for surfaces | |
| 49 * with per-pixel alpha. The details differ, however: | |
| 50 * | |
| 51 * Encoding of colorkeyed surfaces: | |
| 52 * | |
| 53 * Encoded pixels always have the same format as the target surface. | |
| 54 * <skip> and <run> are unsigned 8 bit integers, except for 32 bit depth | |
| 55 * where they are 16 bit. This makes the pixel data aligned at all times. | |
| 56 * Segments never wrap around from one scan line to the next. | |
| 57 * | |
| 58 * The end of the sequence is marked by a zero <skip>,<run> pair at the * | |
| 59 * beginning of a line. | |
| 60 * | |
| 61 * Encoding of surfaces with per-pixel alpha: | |
| 62 * | |
| 63 * The sequence begins with a struct RLEDestFormat describing the target | |
| 64 * pixel format, to provide reliable un-encoding. | |
| 65 * | |
| 66 * Each scan line is encoded twice: First all completely opaque pixels, | |
| 67 * encoded in the target format as described above, and then all | |
| 68 * partially transparent (translucent) pixels (where 1 <= alpha <= 254), | |
| 69 * in the following 32-bit format: | |
| 70 * | |
| 71 * For 32-bit targets, each pixel has the target RGB format but with | |
| 72 * the alpha value occupying the highest 8 bits. The <skip> and <run> | |
| 73 * counts are 16 bit. | |
| 74 * | |
| 75 * For 16-bit targets, each pixel has the target RGB format, but with | |
| 76 * the middle component (usually green) shifted 16 steps to the left, | |
| 77 * and the hole filled with the 5 most significant bits of the alpha value. | |
| 78 * i.e. if the target has the format rrrrrggggggbbbbb, | |
| 79 * the encoded pixel will be 00000gggggg00000rrrrr0aaaaabbbbb. | |
| 80 * The <skip> and <run> counts are 8 bit for the opaque lines, 16 bit | |
| 81 * for the translucent lines. Two padding bytes may be inserted | |
| 82 * before each translucent line to keep them 32-bit aligned. | |
| 83 * | |
| 84 * The end of the sequence is marked by a zero <skip>,<run> pair at the | |
| 85 * beginning of an opaque line. | |
| 86 */ | |
| 87 | |
| 88 #include "SDL_video.h" | |
| 89 #include "SDL_sysvideo.h" | |
| 90 #include "SDL_blit.h" | |
| 91 #include "SDL_RLEaccel_c.h" | |
| 92 | |
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93 #if (i386 || __x86_64__) && __GNUC__ && SDL_ASSEMBLY_BLITTERS |
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94 #define MMX_ASMBLIT |
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95 #endif |
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96 |
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97 #ifdef MMX_ASMBLIT |
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98 #include "mmx.h" |
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99 #include "SDL_cpuinfo.h" |
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100 #endif |
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101 |
| 0 | 102 #ifndef MAX |
| 103 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 104 #endif | |
| 105 #ifndef MIN | |
| 106 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 107 #endif | |
| 108 | |
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109 #define PIXEL_COPY(to, from, len, bpp) \ |
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110 do { \ |
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111 if(bpp == 4) { \ |
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112 SDL_memcpy4(to, from, (unsigned)(len)); \ |
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113 } else { \ |
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114 SDL_memcpy(to, from, (unsigned)(len) * (bpp)); \ |
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115 } \ |
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116 } while(0) |
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117 |
| 0 | 118 /* |
| 119 * Various colorkey blit methods, for opaque and per-surface alpha | |
| 120 */ | |
| 121 | |
| 122 #define OPAQUE_BLIT(to, from, length, bpp, alpha) \ | |
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123 PIXEL_COPY(to, from, length, bpp) |
| 0 | 124 |
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125 #ifdef MMX_ASMBLIT |
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126 |
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127 #define ALPHA_BLIT32_888MMX(to, from, length, bpp, alpha) \ |
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128 do { \ |
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129 Uint32 *srcp = (Uint32 *)(from); \ |
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130 Uint32 *dstp = (Uint32 *)(to); \ |
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131 int i = 0x00FF00FF; \ |
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132 movd_m2r(*(&i), mm3); \ |
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133 punpckldq_r2r(mm3, mm3); \ |
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134 i = 0xFF000000; \ |
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135 movd_m2r(*(&i), mm7); \ |
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136 punpckldq_r2r(mm7, mm7); \ |
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137 i = alpha | alpha << 16; \ |
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138 movd_m2r(*(&i), mm4); \ |
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139 punpckldq_r2r(mm4, mm4); \ |
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140 pcmpeqd_r2r(mm5,mm5); /* set mm5 to "1" */ \ |
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141 pxor_r2r(mm7, mm5); /* make clear alpha mask */ \ |
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142 i = length; \ |
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143 if(i & 1) { \ |
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144 movd_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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145 punpcklbw_r2r(mm1, mm1); \ |
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146 pand_r2r(mm3, mm1); \ |
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147 movd_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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148 punpcklbw_r2r(mm2, mm2); \ |
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149 pand_r2r(mm3, mm2); \ |
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150 psubw_r2r(mm2, mm1); \ |
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151 pmullw_r2r(mm4, mm1); \ |
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152 psrlw_i2r(8, mm1); \ |
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153 paddw_r2r(mm1, mm2); \ |
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154 pand_r2r(mm3, mm2); \ |
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155 packuswb_r2r(mm2, mm2); \ |
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156 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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157 movd_r2m(mm2, *dstp); \ |
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158 ++srcp; \ |
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159 ++dstp; \ |
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160 i--; \ |
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161 } \ |
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162 for(; i > 0; --i) { \ |
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163 movq_m2r((*srcp), mm0); \ |
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164 movq_r2r(mm0, mm1); \ |
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165 punpcklbw_r2r(mm0, mm0); \ |
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166 movq_m2r((*dstp), mm2); \ |
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167 punpckhbw_r2r(mm1, mm1); \ |
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168 movq_r2r(mm2, mm6); \ |
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169 pand_r2r(mm3, mm0); \ |
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170 punpcklbw_r2r(mm2, mm2); \ |
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171 pand_r2r(mm3, mm1); \ |
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172 punpckhbw_r2r(mm6, mm6); \ |
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173 pand_r2r(mm3, mm2); \ |
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174 psubw_r2r(mm2, mm0); \ |
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175 pmullw_r2r(mm4, mm0); \ |
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176 pand_r2r(mm3, mm6); \ |
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177 psubw_r2r(mm6, mm1); \ |
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178 pmullw_r2r(mm4, mm1); \ |
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179 psrlw_i2r(8, mm0); \ |
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180 paddw_r2r(mm0, mm2); \ |
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181 psrlw_i2r(8, mm1); \ |
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182 paddw_r2r(mm1, mm6); \ |
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183 pand_r2r(mm3, mm2); \ |
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184 pand_r2r(mm3, mm6); \ |
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185 packuswb_r2r(mm2, mm2); \ |
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186 packuswb_r2r(mm6, mm6); \ |
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187 psrlq_i2r(32, mm2); \ |
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188 psllq_i2r(32, mm6); \ |
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189 por_r2r(mm6, mm2); \ |
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190 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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191 movq_r2m(mm2, *dstp); \ |
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192 srcp += 2; \ |
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193 dstp += 2; \ |
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194 i--; \ |
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195 } \ |
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196 emms(); \ |
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197 } while(0) |
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198 |
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199 #define ALPHA_BLIT16_565MMX(to, from, length, bpp, alpha) \ |
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200 do { \ |
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201 int i, n = 0; \ |
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202 Uint16 *srcp = (Uint16 *)(from); \ |
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203 Uint16 *dstp = (Uint16 *)(to); \ |
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204 Uint32 ALPHA = 0xF800; \ |
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205 movd_m2r(*(&ALPHA), mm1); \ |
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206 punpcklwd_r2r(mm1, mm1); \ |
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207 punpcklwd_r2r(mm1, mm1); \ |
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208 ALPHA = 0x07E0; \ |
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209 movd_m2r(*(&ALPHA), mm4); \ |
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210 punpcklwd_r2r(mm4, mm4); \ |
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211 punpcklwd_r2r(mm4, mm4); \ |
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212 ALPHA = 0x001F; \ |
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213 movd_m2r(*(&ALPHA), mm7); \ |
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214 punpcklwd_r2r(mm7, mm7); \ |
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215 punpcklwd_r2r(mm7, mm7); \ |
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216 alpha &= ~(1+2+4); \ |
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217 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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218 movd_m2r(*(&i), mm0); \ |
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219 punpckldq_r2r(mm0, mm0); \ |
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220 ALPHA = alpha >> 3; \ |
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221 i = ((int)(length) & 3); \ |
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222 for(; i > 0; --i) { \ |
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223 Uint32 s = *srcp++; \ |
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224 Uint32 d = *dstp; \ |
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225 s = (s | s << 16) & 0x07e0f81f; \ |
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226 d = (d | d << 16) & 0x07e0f81f; \ |
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227 d += (s - d) * ALPHA >> 5; \ |
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228 d &= 0x07e0f81f; \ |
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229 *dstp++ = d | d >> 16; \ |
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230 n++; \ |
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231 } \ |
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232 i = (int)(length) - n; \ |
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233 for(; i > 0; --i) { \ |
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234 movq_m2r((*dstp), mm3); \ |
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235 movq_m2r((*srcp), mm2); \ |
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236 movq_r2r(mm2, mm5); \ |
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237 pand_r2r(mm1 , mm5); \ |
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238 psrlq_i2r(11, mm5); \ |
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239 movq_r2r(mm3, mm6); \ |
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240 pand_r2r(mm1 , mm6); \ |
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241 psrlq_i2r(11, mm6); \ |
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242 psubw_r2r(mm6, mm5); \ |
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243 pmullw_r2r(mm0, mm5); \ |
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244 psrlw_i2r(8, mm5); \ |
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245 paddw_r2r(mm5, mm6); \ |
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246 psllq_i2r(11, mm6); \ |
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247 pand_r2r(mm1, mm6); \ |
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248 movq_r2r(mm4, mm5); \ |
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249 por_r2r(mm7, mm5); \ |
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250 pand_r2r(mm5, mm3); \ |
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251 por_r2r(mm6, mm3); \ |
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252 movq_r2r(mm2, mm5); \ |
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253 pand_r2r(mm4 , mm5); \ |
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254 psrlq_i2r(5, mm5); \ |
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255 movq_r2r(mm3, mm6); \ |
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256 pand_r2r(mm4 , mm6); \ |
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257 psrlq_i2r(5, mm6); \ |
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258 psubw_r2r(mm6, mm5); \ |
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259 pmullw_r2r(mm0, mm5); \ |
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260 psrlw_i2r(8, mm5); \ |
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261 paddw_r2r(mm5, mm6); \ |
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262 psllq_i2r(5, mm6); \ |
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263 pand_r2r(mm4, mm6); \ |
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264 movq_r2r(mm1, mm5); \ |
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265 por_r2r(mm7, mm5); \ |
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266 pand_r2r(mm5, mm3); \ |
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267 por_r2r(mm6, mm3); \ |
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268 movq_r2r(mm2, mm5); \ |
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269 pand_r2r(mm7 , mm5); \ |
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270 movq_r2r(mm3, mm6); \ |
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271 pand_r2r(mm7 , mm6); \ |
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272 psubw_r2r(mm6, mm5); \ |
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273 pmullw_r2r(mm0, mm5); \ |
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274 psrlw_i2r(8, mm5); \ |
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275 paddw_r2r(mm5, mm6); \ |
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276 pand_r2r(mm7, mm6); \ |
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277 movq_r2r(mm1, mm5); \ |
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278 por_r2r(mm4, mm5); \ |
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279 pand_r2r(mm5, mm3); \ |
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280 por_r2r(mm6, mm3); \ |
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281 movq_r2m(mm3, *dstp); \ |
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282 srcp += 4; \ |
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283 dstp += 4; \ |
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284 i -= 3; \ |
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285 } \ |
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286 emms(); \ |
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287 } while(0) |
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288 |
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289 #define ALPHA_BLIT16_555MMX(to, from, length, bpp, alpha) \ |
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290 do { \ |
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291 int i, n = 0; \ |
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292 Uint16 *srcp = (Uint16 *)(from); \ |
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293 Uint16 *dstp = (Uint16 *)(to); \ |
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294 Uint32 ALPHA = 0x7C00; \ |
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295 movd_m2r(*(&ALPHA), mm1); \ |
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296 punpcklwd_r2r(mm1, mm1); \ |
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297 punpcklwd_r2r(mm1, mm1); \ |
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298 ALPHA = 0x03E0; \ |
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299 movd_m2r(*(&ALPHA), mm4); \ |
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300 punpcklwd_r2r(mm4, mm4); \ |
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301 punpcklwd_r2r(mm4, mm4); \ |
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302 ALPHA = 0x001F; \ |
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303 movd_m2r(*(&ALPHA), mm7); \ |
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304 punpcklwd_r2r(mm7, mm7); \ |
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305 punpcklwd_r2r(mm7, mm7); \ |
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306 alpha &= ~(1+2+4); \ |
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307 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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308 movd_m2r(*(&i), mm0); \ |
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309 punpckldq_r2r(mm0, mm0); \ |
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310 i = ((int)(length) & 3); \ |
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311 ALPHA = alpha >> 3; \ |
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312 for(; i > 0; --i) { \ |
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313 Uint32 s = *srcp++; \ |
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314 Uint32 d = *dstp; \ |
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315 s = (s | s << 16) & 0x03e07c1f; \ |
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316 d = (d | d << 16) & 0x03e07c1f; \ |
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317 d += (s - d) * ALPHA >> 5; \ |
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318 d &= 0x03e07c1f; \ |
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319 *dstp++ = d | d >> 16; \ |
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320 n++; \ |
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321 } \ |
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322 i = (int)(length) - n; \ |
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323 for(; i > 0; --i) { \ |
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324 movq_m2r((*dstp), mm3); \ |
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325 movq_m2r((*srcp), mm2); \ |
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326 movq_r2r(mm2, mm5); \ |
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327 pand_r2r(mm1 , mm5); \ |
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328 psrlq_i2r(10, mm5); \ |
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329 movq_r2r(mm3, mm6); \ |
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330 pand_r2r(mm1 , mm6); \ |
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331 psrlq_i2r(10, mm6); \ |
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332 psubw_r2r(mm6, mm5); \ |
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333 pmullw_r2r(mm0, mm5); \ |
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334 psrlw_i2r(8, mm5); \ |
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335 paddw_r2r(mm5, mm6); \ |
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336 psllq_i2r(10, mm6); \ |
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337 pand_r2r(mm1, mm6); \ |
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338 movq_r2r(mm4, mm5); \ |
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339 por_r2r(mm7, mm5); \ |
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340 pand_r2r(mm5, mm3); \ |
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341 por_r2r(mm6, mm3); \ |
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342 movq_r2r(mm2, mm5); \ |
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343 pand_r2r(mm4 , mm5); \ |
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344 psrlq_i2r(5, mm5); \ |
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345 movq_r2r(mm3, mm6); \ |
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346 pand_r2r(mm4 , mm6); \ |
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347 psrlq_i2r(5, mm6); \ |
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348 psubw_r2r(mm6, mm5); \ |
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349 pmullw_r2r(mm0, mm5); \ |
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350 psrlw_i2r(8, mm5); \ |
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351 paddw_r2r(mm5, mm6); \ |
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352 psllq_i2r(5, mm6); \ |
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353 pand_r2r(mm4, mm6); \ |
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354 movq_r2r(mm1, mm5); \ |
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355 por_r2r(mm7, mm5); \ |
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356 pand_r2r(mm5, mm3); \ |
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357 por_r2r(mm6, mm3); \ |
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358 movq_r2r(mm2, mm5); \ |
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359 pand_r2r(mm7 , mm5); \ |
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360 movq_r2r(mm3, mm6); \ |
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361 pand_r2r(mm7 , mm6); \ |
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362 psubw_r2r(mm6, mm5); \ |
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363 pmullw_r2r(mm0, mm5); \ |
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364 psrlw_i2r(8, mm5); \ |
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365 paddw_r2r(mm5, mm6); \ |
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366 pand_r2r(mm7, mm6); \ |
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367 movq_r2r(mm1, mm5); \ |
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368 por_r2r(mm4, mm5); \ |
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369 pand_r2r(mm5, mm3); \ |
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370 por_r2r(mm6, mm3); \ |
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371 movq_r2m(mm3, *dstp); \ |
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372 srcp += 4; \ |
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373 dstp += 4; \ |
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374 i -= 3; \ |
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375 } \ |
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376 emms(); \ |
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377 } while(0) |
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378 |
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379 #endif |
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380 |
| 0 | 381 /* |
| 382 * For 32bpp pixels on the form 0x00rrggbb: | |
| 383 * If we treat the middle component separately, we can process the two | |
| 384 * remaining in parallel. This is safe to do because of the gap to the left | |
| 385 * of each component, so the bits from the multiplication don't collide. | |
| 386 * This can be used for any RGB permutation of course. | |
| 387 */ | |
| 388 #define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \ | |
| 389 do { \ | |
| 390 int i; \ | |
| 391 Uint32 *src = (Uint32 *)(from); \ | |
| 392 Uint32 *dst = (Uint32 *)(to); \ | |
| 393 for(i = 0; i < (int)(length); i++) { \ | |
| 394 Uint32 s = *src++; \ | |
| 395 Uint32 d = *dst; \ | |
| 396 Uint32 s1 = s & 0xff00ff; \ | |
| 397 Uint32 d1 = d & 0xff00ff; \ | |
| 398 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 399 s &= 0xff00; \ | |
| 400 d &= 0xff00; \ | |
| 401 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 402 *dst++ = d1 | d; \ | |
| 403 } \ | |
| 404 } while(0) | |
| 405 | |
| 406 /* | |
| 407 * For 16bpp pixels we can go a step further: put the middle component | |
| 408 * in the high 16 bits of a 32 bit word, and process all three RGB | |
| 409 * components at the same time. Since the smallest gap is here just | |
| 410 * 5 bits, we have to scale alpha down to 5 bits as well. | |
| 411 */ | |
| 412 #define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \ | |
| 413 do { \ | |
| 414 int i; \ | |
| 415 Uint16 *src = (Uint16 *)(from); \ | |
| 416 Uint16 *dst = (Uint16 *)(to); \ | |
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417 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 418 for(i = 0; i < (int)(length); i++) { \ |
| 419 Uint32 s = *src++; \ | |
| 420 Uint32 d = *dst; \ | |
| 421 s = (s | s << 16) & 0x07e0f81f; \ | |
| 422 d = (d | d << 16) & 0x07e0f81f; \ | |
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423 d += (s - d) * ALPHA >> 5; \ |
| 0 | 424 d &= 0x07e0f81f; \ |
| 425 *dst++ = d | d >> 16; \ | |
| 426 } \ | |
| 427 } while(0) | |
| 428 | |
| 429 #define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \ | |
| 430 do { \ | |
| 431 int i; \ | |
| 432 Uint16 *src = (Uint16 *)(from); \ | |
| 433 Uint16 *dst = (Uint16 *)(to); \ | |
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689
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434 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 435 for(i = 0; i < (int)(length); i++) { \ |
| 436 Uint32 s = *src++; \ | |
| 437 Uint32 d = *dst; \ | |
| 438 s = (s | s << 16) & 0x03e07c1f; \ | |
| 439 d = (d | d << 16) & 0x03e07c1f; \ | |
|
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440 d += (s - d) * ALPHA >> 5; \ |
| 0 | 441 d &= 0x03e07c1f; \ |
| 442 *dst++ = d | d >> 16; \ | |
| 443 } \ | |
| 444 } while(0) | |
| 445 | |
| 446 /* | |
| 447 * The general slow catch-all function, for remaining depths and formats | |
| 448 */ | |
| 449 #define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \ | |
| 450 do { \ | |
| 451 int i; \ | |
| 452 Uint8 *src = from; \ | |
| 453 Uint8 *dst = to; \ | |
| 454 for(i = 0; i < (int)(length); i++) { \ | |
| 455 Uint32 s, d; \ | |
| 456 unsigned rs, gs, bs, rd, gd, bd; \ | |
| 457 switch(bpp) { \ | |
| 458 case 2: \ | |
| 459 s = *(Uint16 *)src; \ | |
| 460 d = *(Uint16 *)dst; \ | |
| 461 break; \ | |
| 462 case 3: \ | |
| 463 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 464 s = (src[0] << 16) | (src[1] << 8) | src[2]; \ | |
| 465 d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \ | |
| 466 } else { \ | |
| 467 s = (src[2] << 16) | (src[1] << 8) | src[0]; \ | |
| 468 d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \ | |
| 469 } \ | |
| 470 break; \ | |
| 471 case 4: \ | |
| 472 s = *(Uint32 *)src; \ | |
| 473 d = *(Uint32 *)dst; \ | |
| 474 break; \ | |
| 475 } \ | |
| 476 RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \ | |
| 477 RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \ | |
| 478 rd += (rs - rd) * alpha >> 8; \ | |
| 479 gd += (gs - gd) * alpha >> 8; \ | |
| 480 bd += (bs - bd) * alpha >> 8; \ | |
| 481 PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \ | |
| 482 switch(bpp) { \ | |
| 483 case 2: \ | |
| 484 *(Uint16 *)dst = d; \ | |
| 485 break; \ | |
| 486 case 3: \ | |
| 487 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 488 dst[0] = d >> 16; \ | |
| 489 dst[1] = d >> 8; \ | |
| 490 dst[2] = d; \ | |
| 491 } else { \ | |
| 492 dst[0] = d; \ | |
| 493 dst[1] = d >> 8; \ | |
| 494 dst[2] = d >> 16; \ | |
| 495 } \ | |
| 496 break; \ | |
| 497 case 4: \ | |
| 498 *(Uint32 *)dst = d; \ | |
| 499 break; \ | |
| 500 } \ | |
| 501 src += bpp; \ | |
| 502 dst += bpp; \ | |
| 503 } \ | |
| 504 } while(0) | |
| 505 | |
|
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506 #ifdef MMX_ASMBLIT |
| 0 | 507 |
|
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508 #define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha) \ |
|
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509 do { \ |
|
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510 Uint32 *srcp = (Uint32 *)(from); \ |
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511 Uint32 *dstp = (Uint32 *)(to); \ |
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512 int i = 0x00fefefe; \ |
|
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513 movd_m2r(*(&i), mm4); \ |
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514 punpckldq_r2r(mm4, mm4); \ |
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515 i = 0x00010101; \ |
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516 movd_m2r(*(&i), mm3); \ |
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517 punpckldq_r2r(mm3, mm3); \ |
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518 i = (int)(length); \ |
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519 if( i & 1 ) { \ |
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520 Uint32 s = *srcp++; \ |
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521 Uint32 d = *dstp; \ |
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522 *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ |
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523 + (s & d & 0x00010101); \ |
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524 i--; \ |
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525 } \ |
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526 for(; i > 0; --i) { \ |
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527 movq_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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528 movq_r2r(mm2, mm6); /* dst -> mm6 */ \ |
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529 movq_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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530 movq_r2r(mm1, mm5); /* src -> mm5 */ \ |
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531 pand_r2r(mm4, mm6); /* dst & 0x00fefefe -> mm6 */ \ |
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532 pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */ \ |
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533 paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */ \ |
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534 psrld_i2r(1, mm5); \ |
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535 pand_r2r(mm1, mm2); /* s & d -> mm2 */ \ |
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536 pand_r2r(mm3, mm2); /* s & d & 0x00010101 -> mm2 */ \ |
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537 paddd_r2r(mm5, mm2); \ |
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538 movq_r2m(mm2, (*dstp)); \ |
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539 dstp += 2; \ |
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540 srcp += 2; \ |
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541 i--; \ |
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542 } \ |
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543 emms(); \ |
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544 } while(0) |
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545 |
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546 #endif |
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547 |
| 0 | 548 /* |
| 549 * Special case: 50% alpha (alpha=128) | |
| 550 * This is treated specially because it can be optimized very well, and | |
| 551 * since it is good for many cases of semi-translucency. | |
| 552 * The theory is to do all three components at the same time: | |
| 553 * First zero the lowest bit of each component, which gives us room to | |
| 554 * add them. Then shift right and add the sum of the lowest bits. | |
| 555 */ | |
| 556 #define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \ | |
| 557 do { \ | |
| 558 int i; \ | |
| 559 Uint32 *src = (Uint32 *)(from); \ | |
| 560 Uint32 *dst = (Uint32 *)(to); \ | |
| 561 for(i = 0; i < (int)(length); i++) { \ | |
| 562 Uint32 s = *src++; \ | |
| 563 Uint32 d = *dst; \ | |
| 564 *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ | |
| 565 + (s & d & 0x00010101); \ | |
| 566 } \ | |
| 567 } while(0) | |
| 568 | |
| 569 /* | |
| 570 * For 16bpp, we can actually blend two pixels in parallel, if we take | |
| 571 * care to shift before we add, not after. | |
| 572 */ | |
| 573 | |
| 574 /* helper: blend a single 16 bit pixel at 50% */ | |
| 575 #define BLEND16_50(dst, src, mask) \ | |
| 576 do { \ | |
| 577 Uint32 s = *src++; \ | |
| 578 Uint32 d = *dst; \ | |
| 579 *dst++ = (((s & mask) + (d & mask)) >> 1) \ | |
| 580 + (s & d & (~mask & 0xffff)); \ | |
| 581 } while(0) | |
| 582 | |
| 583 /* basic 16bpp blender. mask is the pixels to keep when adding. */ | |
| 584 #define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \ | |
| 585 do { \ | |
| 586 unsigned n = (length); \ | |
| 587 Uint16 *src = (Uint16 *)(from); \ | |
| 588 Uint16 *dst = (Uint16 *)(to); \ | |
| 589 if(((unsigned long)src ^ (unsigned long)dst) & 3) { \ | |
| 590 /* source and destination not in phase, blit one by one */ \ | |
| 591 while(n--) \ | |
| 592 BLEND16_50(dst, src, mask); \ | |
| 593 } else { \ | |
| 594 if((unsigned long)src & 3) { \ | |
| 595 /* first odd pixel */ \ | |
| 596 BLEND16_50(dst, src, mask); \ | |
| 597 n--; \ | |
| 598 } \ | |
| 599 for(; n > 1; n -= 2) { \ | |
| 600 Uint32 s = *(Uint32 *)src; \ | |
| 601 Uint32 d = *(Uint32 *)dst; \ | |
| 602 *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \ | |
| 603 + ((d & (mask | mask << 16)) >> 1) \ | |
| 604 + (s & d & (~(mask | mask << 16))); \ | |
| 605 src += 2; \ | |
| 606 dst += 2; \ | |
| 607 } \ | |
| 608 if(n) \ | |
| 609 BLEND16_50(dst, src, mask); /* last odd pixel */ \ | |
| 610 } \ | |
| 611 } while(0) | |
| 612 | |
| 613 #define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \ | |
| 614 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de) | |
| 615 | |
| 616 #define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \ | |
| 617 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde) | |
| 618 | |
|
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619 #ifdef MMX_ASMBLIT |
| 0 | 620 |
| 621 #define CHOOSE_BLIT(blitter, alpha, fmt) \ | |
| 622 do { \ | |
| 623 if(alpha == 255) { \ | |
| 624 switch(fmt->BytesPerPixel) { \ | |
| 625 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ | |
| 626 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ | |
| 627 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ | |
| 628 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ | |
| 629 } \ | |
| 630 } else { \ | |
| 631 switch(fmt->BytesPerPixel) { \ | |
| 632 case 1: \ | |
| 633 /* No 8bpp alpha blitting */ \ | |
| 634 break; \ | |
| 635 \ | |
| 636 case 2: \ | |
| 637 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ | |
| 638 case 0xffff: \ | |
| 639 if(fmt->Gmask == 0x07e0 \ | |
| 640 || fmt->Rmask == 0x07e0 \ | |
| 641 || fmt->Bmask == 0x07e0) { \ | |
| 642 if(alpha == 128) \ | |
| 643 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ | |
| 644 else { \ | |
|
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645 if(SDL_HasMMX()) \ |
|
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646 blitter(2, Uint8, ALPHA_BLIT16_565MMX); \ |
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647 else \ |
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648 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
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649 } \ |
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650 } else \ |
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651 goto general16; \ |
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652 break; \ |
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653 \ |
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654 case 0x7fff: \ |
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655 if(fmt->Gmask == 0x03e0 \ |
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656 || fmt->Rmask == 0x03e0 \ |
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657 || fmt->Bmask == 0x03e0) { \ |
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658 if(alpha == 128) \ |
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659 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ |
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660 else { \ |
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661 if(SDL_HasMMX()) \ |
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662 blitter(2, Uint8, ALPHA_BLIT16_555MMX); \ |
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663 else \ |
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664 blitter(2, Uint8, ALPHA_BLIT16_555); \ |
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665 } \ |
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666 break; \ |
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667 } \ |
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668 /* fallthrough */ \ |
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669 \ |
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670 default: \ |
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671 general16: \ |
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672 blitter(2, Uint8, ALPHA_BLIT_ANY); \ |
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673 } \ |
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674 break; \ |
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675 \ |
|
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676 case 3: \ |
|
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677 blitter(3, Uint8, ALPHA_BLIT_ANY); \ |
|
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678 break; \ |
|
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679 \ |
|
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680 case 4: \ |
|
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681 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ |
|
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682 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ |
|
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683 || fmt->Bmask == 0xff00)) { \ |
|
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684 if(alpha == 128) \ |
|
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685 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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686 if(SDL_HasMMX()) \ |
|
689
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687 blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\ |
|
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688 else \ |
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689 blitter(4, Uint16, ALPHA_BLIT32_888_50);\ |
|
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690 } \ |
|
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691 else \ |
|
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692 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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693 if(SDL_HasMMX()) \ |
|
689
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694 blitter(4, Uint16, ALPHA_BLIT32_888MMX);\ |
|
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695 else \ |
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696 blitter(4, Uint16, ALPHA_BLIT32_888); \ |
|
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697 } \ |
|
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698 } else \ |
|
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699 blitter(4, Uint16, ALPHA_BLIT_ANY); \ |
|
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700 break; \ |
|
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701 } \ |
|
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702 } \ |
|
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703 } while(0) |
|
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704 |
|
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705 #else |
|
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706 |
|
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707 #define CHOOSE_BLIT(blitter, alpha, fmt) \ |
|
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708 do { \ |
|
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709 if(alpha == 255) { \ |
|
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710 switch(fmt->BytesPerPixel) { \ |
|
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711 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ |
|
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712 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ |
|
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713 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ |
|
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714 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ |
|
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715 } \ |
|
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716 } else { \ |
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717 switch(fmt->BytesPerPixel) { \ |
|
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718 case 1: \ |
|
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719 /* No 8bpp alpha blitting */ \ |
|
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720 break; \ |
|
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721 \ |
|
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722 case 2: \ |
|
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723 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ |
|
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724 case 0xffff: \ |
|
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725 if(fmt->Gmask == 0x07e0 \ |
|
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726 || fmt->Rmask == 0x07e0 \ |
|
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727 || fmt->Bmask == 0x07e0) { \ |
|
5bb080d35049
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|
728 if(alpha == 128) \ |
|
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729 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ |
|
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730 else { \ |
| 0 | 731 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
| 732 } \ | |
| 733 } else \ | |
| 734 goto general16; \ | |
| 735 break; \ | |
| 736 \ | |
| 737 case 0x7fff: \ | |
| 738 if(fmt->Gmask == 0x03e0 \ | |
| 739 || fmt->Rmask == 0x03e0 \ | |
| 740 || fmt->Bmask == 0x03e0) { \ | |
| 741 if(alpha == 128) \ | |
| 742 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ | |
| 743 else { \ | |
| 744 blitter(2, Uint8, ALPHA_BLIT16_555); \ | |
| 745 } \ | |
| 746 break; \ | |
| 747 } \ | |
| 748 /* fallthrough */ \ | |
| 749 \ | |
| 750 default: \ | |
| 751 general16: \ | |
| 752 blitter(2, Uint8, ALPHA_BLIT_ANY); \ | |
| 753 } \ | |
| 754 break; \ | |
| 755 \ | |
| 756 case 3: \ | |
| 757 blitter(3, Uint8, ALPHA_BLIT_ANY); \ | |
| 758 break; \ | |
| 759 \ | |
| 760 case 4: \ | |
| 761 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ | |
| 762 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ | |
| 763 || fmt->Bmask == 0xff00)) { \ | |
| 764 if(alpha == 128) \ | |
| 765 blitter(4, Uint16, ALPHA_BLIT32_888_50); \ | |
| 766 else \ | |
| 767 blitter(4, Uint16, ALPHA_BLIT32_888); \ | |
| 768 } else \ | |
| 769 blitter(4, Uint16, ALPHA_BLIT_ANY); \ | |
| 770 break; \ | |
| 771 } \ | |
| 772 } \ | |
| 773 } while(0) | |
| 774 | |
|
689
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|
775 #endif |
| 0 | 776 |
| 777 /* | |
| 778 * This takes care of the case when the surface is clipped on the left and/or | |
| 779 * right. Top clipping has already been taken care of. | |
| 780 */ | |
| 781 static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 782 Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha) | |
| 783 { | |
| 784 SDL_PixelFormat *fmt = dst->format; | |
| 785 | |
| 786 #define RLECLIPBLIT(bpp, Type, do_blit) \ | |
| 787 do { \ | |
| 788 int linecount = srcrect->h; \ | |
| 789 int ofs = 0; \ | |
| 790 int left = srcrect->x; \ | |
| 791 int right = left + srcrect->w; \ | |
| 792 dstbuf -= left * bpp; \ | |
| 793 for(;;) { \ | |
| 794 int run; \ | |
| 795 ofs += *(Type *)srcbuf; \ | |
| 796 run = ((Type *)srcbuf)[1]; \ | |
| 797 srcbuf += 2 * sizeof(Type); \ | |
| 798 if(run) { \ | |
| 799 /* clip to left and right borders */ \ | |
| 800 if(ofs < right) { \ | |
| 801 int start = 0; \ | |
| 802 int len = run; \ | |
| 803 int startcol; \ | |
| 804 if(left - ofs > 0) { \ | |
| 805 start = left - ofs; \ | |
| 806 len -= start; \ | |
| 807 if(len <= 0) \ | |
| 808 goto nocopy ## bpp ## do_blit; \ | |
| 809 } \ | |
| 810 startcol = ofs + start; \ | |
| 811 if(len > right - startcol) \ | |
| 812 len = right - startcol; \ | |
| 813 do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \ | |
| 814 len, bpp, alpha); \ | |
| 815 } \ | |
| 816 nocopy ## bpp ## do_blit: \ | |
| 817 srcbuf += run * bpp; \ | |
| 818 ofs += run; \ | |
| 819 } else if(!ofs) \ | |
| 820 break; \ | |
| 821 if(ofs == w) { \ | |
| 822 ofs = 0; \ | |
| 823 dstbuf += dst->pitch; \ | |
| 824 if(!--linecount) \ | |
| 825 break; \ | |
| 826 } \ | |
| 827 } \ | |
| 828 } while(0) | |
| 829 | |
| 830 CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); | |
| 831 | |
| 832 #undef RLECLIPBLIT | |
| 833 | |
| 834 } | |
| 835 | |
| 836 | |
| 837 /* blit a colorkeyed RLE surface */ | |
| 838 int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 839 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 840 { | |
| 841 Uint8 *dstbuf; | |
| 842 Uint8 *srcbuf; | |
| 843 int x, y; | |
| 844 int w = src->w; | |
| 845 unsigned alpha; | |
| 846 | |
| 847 /* Lock the destination if necessary */ | |
|
526
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|
848 if ( SDL_MUSTLOCK(dst) ) { |
|
4314a501d7be
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|
849 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 850 return(-1); |
| 851 } | |
| 852 } | |
| 853 | |
| 854 /* Set up the source and destination pointers */ | |
| 855 x = dstrect->x; | |
| 856 y = dstrect->y; | |
|
526
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|
857 dstbuf = (Uint8 *)dst->pixels |
| 0 | 858 + y * dst->pitch + x * src->format->BytesPerPixel; |
| 859 srcbuf = (Uint8 *)src->map->sw_data->aux_data; | |
| 860 | |
| 861 { | |
| 862 /* skip lines at the top if neccessary */ | |
| 863 int vskip = srcrect->y; | |
| 864 int ofs = 0; | |
| 865 if(vskip) { | |
| 866 | |
| 867 #define RLESKIP(bpp, Type) \ | |
| 868 for(;;) { \ | |
| 869 int run; \ | |
| 870 ofs += *(Type *)srcbuf; \ | |
| 871 run = ((Type *)srcbuf)[1]; \ | |
| 872 srcbuf += sizeof(Type) * 2; \ | |
| 873 if(run) { \ | |
| 874 srcbuf += run * bpp; \ | |
| 875 ofs += run; \ | |
| 876 } else if(!ofs) \ | |
| 877 goto done; \ | |
| 878 if(ofs == w) { \ | |
| 879 ofs = 0; \ | |
| 880 if(!--vskip) \ | |
| 881 break; \ | |
| 882 } \ | |
| 883 } | |
| 884 | |
| 885 switch(src->format->BytesPerPixel) { | |
| 886 case 1: RLESKIP(1, Uint8); break; | |
| 887 case 2: RLESKIP(2, Uint8); break; | |
| 888 case 3: RLESKIP(3, Uint8); break; | |
| 889 case 4: RLESKIP(4, Uint16); break; | |
| 890 } | |
| 891 | |
| 892 #undef RLESKIP | |
| 893 | |
| 894 } | |
| 895 } | |
| 896 | |
| 897 alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 898 ? src->format->alpha : 255; | |
| 899 /* if left or right edge clipping needed, call clip blit */ | |
| 900 if ( srcrect->x || srcrect->w != src->w ) { | |
| 901 RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); | |
| 902 } else { | |
| 903 SDL_PixelFormat *fmt = src->format; | |
| 904 | |
| 905 #define RLEBLIT(bpp, Type, do_blit) \ | |
| 906 do { \ | |
| 907 int linecount = srcrect->h; \ | |
| 908 int ofs = 0; \ | |
| 909 for(;;) { \ | |
| 910 unsigned run; \ | |
| 911 ofs += *(Type *)srcbuf; \ | |
| 912 run = ((Type *)srcbuf)[1]; \ | |
| 913 srcbuf += 2 * sizeof(Type); \ | |
| 914 if(run) { \ | |
| 915 do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \ | |
| 916 srcbuf += run * bpp; \ | |
| 917 ofs += run; \ | |
| 918 } else if(!ofs) \ | |
| 919 break; \ | |
| 920 if(ofs == w) { \ | |
| 921 ofs = 0; \ | |
| 922 dstbuf += dst->pitch; \ | |
| 923 if(!--linecount) \ | |
| 924 break; \ | |
| 925 } \ | |
| 926 } \ | |
| 927 } while(0) | |
| 928 | |
| 929 CHOOSE_BLIT(RLEBLIT, alpha, fmt); | |
| 930 | |
| 931 #undef RLEBLIT | |
| 932 } | |
| 933 | |
| 934 done: | |
| 935 /* Unlock the destination if necessary */ | |
|
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|
936 if ( SDL_MUSTLOCK(dst) ) { |
|
4314a501d7be
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|
937 SDL_UnlockSurface(dst); |
| 0 | 938 } |
| 939 return(0); | |
| 940 } | |
| 941 | |
| 942 #undef OPAQUE_BLIT | |
| 943 | |
| 944 /* | |
| 945 * Per-pixel blitting macros for translucent pixels: | |
| 946 * These use the same techniques as the per-surface blitting macros | |
| 947 */ | |
| 948 | |
| 949 /* | |
| 950 * For 32bpp pixels, we have made sure the alpha is stored in the top | |
| 951 * 8 bits, so proceed as usual | |
| 952 */ | |
| 953 #define BLIT_TRANSL_888(src, dst) \ | |
| 954 do { \ | |
| 955 Uint32 s = src; \ | |
| 956 Uint32 d = dst; \ | |
| 957 unsigned alpha = s >> 24; \ | |
| 958 Uint32 s1 = s & 0xff00ff; \ | |
| 959 Uint32 d1 = d & 0xff00ff; \ | |
| 960 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 961 s &= 0xff00; \ | |
| 962 d &= 0xff00; \ | |
| 963 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 964 dst = d1 | d; \ | |
| 965 } while(0) | |
| 966 | |
| 967 /* | |
| 968 * For 16bpp pixels, we have stored the 5 most significant alpha bits in | |
| 969 * bits 5-10. As before, we can process all 3 RGB components at the same time. | |
| 970 */ | |
| 971 #define BLIT_TRANSL_565(src, dst) \ | |
| 972 do { \ | |
| 973 Uint32 s = src; \ | |
| 974 Uint32 d = dst; \ | |
| 975 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 976 s &= 0x07e0f81f; \ | |
| 977 d = (d | d << 16) & 0x07e0f81f; \ | |
| 978 d += (s - d) * alpha >> 5; \ | |
| 979 d &= 0x07e0f81f; \ | |
| 980 dst = d | d >> 16; \ | |
| 981 } while(0) | |
| 982 | |
| 983 #define BLIT_TRANSL_555(src, dst) \ | |
| 984 do { \ | |
| 985 Uint32 s = src; \ | |
| 986 Uint32 d = dst; \ | |
| 987 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 988 s &= 0x03e07c1f; \ | |
| 989 d = (d | d << 16) & 0x03e07c1f; \ | |
| 990 d += (s - d) * alpha >> 5; \ | |
| 991 d &= 0x03e07c1f; \ | |
| 992 dst = d | d >> 16; \ | |
| 993 } while(0) | |
| 994 | |
| 995 /* used to save the destination format in the encoding. Designed to be | |
| 996 macro-compatible with SDL_PixelFormat but without the unneeded fields */ | |
| 997 typedef struct { | |
| 998 Uint8 BytesPerPixel; | |
| 999 Uint8 Rloss; | |
| 1000 Uint8 Gloss; | |
| 1001 Uint8 Bloss; | |
| 1002 Uint8 Rshift; | |
| 1003 Uint8 Gshift; | |
| 1004 Uint8 Bshift; | |
| 1005 Uint8 Ashift; | |
| 1006 Uint32 Rmask; | |
| 1007 Uint32 Gmask; | |
| 1008 Uint32 Bmask; | |
| 1009 Uint32 Amask; | |
| 1010 } RLEDestFormat; | |
| 1011 | |
| 1012 /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ | |
| 1013 static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 1014 Uint8 *dstbuf, SDL_Rect *srcrect) | |
| 1015 { | |
| 1016 SDL_PixelFormat *df = dst->format; | |
| 1017 /* | |
| 1018 * clipped blitter: Ptype is the destination pixel type, | |
| 1019 * Ctype the translucent count type, and do_blend the macro | |
| 1020 * to blend one pixel. | |
| 1021 */ | |
| 1022 #define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \ | |
| 1023 do { \ | |
| 1024 int linecount = srcrect->h; \ | |
| 1025 int left = srcrect->x; \ | |
| 1026 int right = left + srcrect->w; \ | |
| 1027 dstbuf -= left * sizeof(Ptype); \ | |
| 1028 do { \ | |
| 1029 int ofs = 0; \ | |
| 1030 /* blit opaque pixels on one line */ \ | |
| 1031 do { \ | |
| 1032 unsigned run; \ | |
| 1033 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1034 run = ((Ctype *)srcbuf)[1]; \ | |
| 1035 srcbuf += 2 * sizeof(Ctype); \ | |
| 1036 if(run) { \ | |
| 1037 /* clip to left and right borders */ \ | |
| 1038 int cofs = ofs; \ | |
| 1039 int crun = run; \ | |
| 1040 if(left - cofs > 0) { \ | |
| 1041 crun -= left - cofs; \ | |
| 1042 cofs = left; \ | |
| 1043 } \ | |
| 1044 if(crun > right - cofs) \ | |
| 1045 crun = right - cofs; \ | |
| 1046 if(crun > 0) \ | |
|
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|
1047 PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \ |
| 0 | 1048 srcbuf + (cofs - ofs) * sizeof(Ptype), \ |
|
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|
1049 (unsigned)crun, sizeof(Ptype)); \ |
| 0 | 1050 srcbuf += run * sizeof(Ptype); \ |
| 1051 ofs += run; \ | |
| 1052 } else if(!ofs) \ | |
| 1053 return; \ | |
| 1054 } while(ofs < w); \ | |
| 1055 /* skip padding if necessary */ \ | |
| 1056 if(sizeof(Ptype) == 2) \ | |
| 1057 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1058 /* blit translucent pixels on the same line */ \ | |
| 1059 ofs = 0; \ | |
| 1060 do { \ | |
| 1061 unsigned run; \ | |
| 1062 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1063 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1064 srcbuf += 4; \ | |
| 1065 if(run) { \ | |
| 1066 /* clip to left and right borders */ \ | |
| 1067 int cofs = ofs; \ | |
| 1068 int crun = run; \ | |
| 1069 if(left - cofs > 0) { \ | |
| 1070 crun -= left - cofs; \ | |
| 1071 cofs = left; \ | |
| 1072 } \ | |
| 1073 if(crun > right - cofs) \ | |
| 1074 crun = right - cofs; \ | |
| 1075 if(crun > 0) { \ | |
| 1076 Ptype *dst = (Ptype *)dstbuf + cofs; \ | |
| 1077 Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \ | |
| 1078 int i; \ | |
| 1079 for(i = 0; i < crun; i++) \ | |
| 1080 do_blend(src[i], dst[i]); \ | |
| 1081 } \ | |
| 1082 srcbuf += run * 4; \ | |
| 1083 ofs += run; \ | |
| 1084 } \ | |
| 1085 } while(ofs < w); \ | |
| 1086 dstbuf += dst->pitch; \ | |
| 1087 } while(--linecount); \ | |
| 1088 } while(0) | |
| 1089 | |
| 1090 switch(df->BytesPerPixel) { | |
| 1091 case 2: | |
| 1092 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1093 || df->Bmask == 0x07e0) | |
| 1094 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1095 else | |
| 1096 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1097 break; | |
| 1098 case 4: | |
| 1099 RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1100 break; | |
| 1101 } | |
| 1102 } | |
| 1103 | |
| 1104 /* blit a pixel-alpha RLE surface */ | |
| 1105 int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 1106 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 1107 { | |
| 1108 int x, y; | |
| 1109 int w = src->w; | |
| 1110 Uint8 *srcbuf, *dstbuf; | |
| 1111 SDL_PixelFormat *df = dst->format; | |
| 1112 | |
| 1113 /* Lock the destination if necessary */ | |
|
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|
1114 if ( SDL_MUSTLOCK(dst) ) { |
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|
1115 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 1116 return -1; |
| 1117 } | |
| 1118 } | |
| 1119 | |
| 1120 x = dstrect->x; | |
| 1121 y = dstrect->y; | |
|
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1122 dstbuf = (Uint8 *)dst->pixels |
| 0 | 1123 + y * dst->pitch + x * df->BytesPerPixel; |
| 1124 srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat); | |
| 1125 | |
| 1126 { | |
| 1127 /* skip lines at the top if necessary */ | |
| 1128 int vskip = srcrect->y; | |
| 1129 if(vskip) { | |
| 1130 int ofs; | |
| 1131 if(df->BytesPerPixel == 2) { | |
| 1132 /* the 16/32 interleaved format */ | |
| 1133 do { | |
| 1134 /* skip opaque line */ | |
| 1135 ofs = 0; | |
| 1136 do { | |
| 1137 int run; | |
| 1138 ofs += srcbuf[0]; | |
| 1139 run = srcbuf[1]; | |
| 1140 srcbuf += 2; | |
| 1141 if(run) { | |
| 1142 srcbuf += 2 * run; | |
| 1143 ofs += run; | |
| 1144 } else if(!ofs) | |
| 1145 goto done; | |
| 1146 } while(ofs < w); | |
| 1147 | |
| 1148 /* skip padding */ | |
| 1149 srcbuf += (unsigned long)srcbuf & 2; | |
| 1150 | |
| 1151 /* skip translucent line */ | |
| 1152 ofs = 0; | |
| 1153 do { | |
| 1154 int run; | |
| 1155 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1156 run = ((Uint16 *)srcbuf)[1]; | |
| 1157 srcbuf += 4 * (run + 1); | |
| 1158 ofs += run; | |
| 1159 } while(ofs < w); | |
| 1160 } while(--vskip); | |
| 1161 } else { | |
| 1162 /* the 32/32 interleaved format */ | |
| 1163 vskip <<= 1; /* opaque and translucent have same format */ | |
| 1164 do { | |
| 1165 ofs = 0; | |
| 1166 do { | |
| 1167 int run; | |
| 1168 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1169 run = ((Uint16 *)srcbuf)[1]; | |
| 1170 srcbuf += 4; | |
| 1171 if(run) { | |
| 1172 srcbuf += 4 * run; | |
| 1173 ofs += run; | |
| 1174 } else if(!ofs) | |
| 1175 goto done; | |
| 1176 } while(ofs < w); | |
| 1177 } while(--vskip); | |
| 1178 } | |
| 1179 } | |
| 1180 } | |
| 1181 | |
| 1182 /* if left or right edge clipping needed, call clip blit */ | |
| 1183 if(srcrect->x || srcrect->w != src->w) { | |
| 1184 RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect); | |
| 1185 } else { | |
| 1186 | |
| 1187 /* | |
| 1188 * non-clipped blitter. Ptype is the destination pixel type, | |
| 1189 * Ctype the translucent count type, and do_blend the | |
| 1190 * macro to blend one pixel. | |
| 1191 */ | |
| 1192 #define RLEALPHABLIT(Ptype, Ctype, do_blend) \ | |
| 1193 do { \ | |
| 1194 int linecount = srcrect->h; \ | |
| 1195 do { \ | |
| 1196 int ofs = 0; \ | |
| 1197 /* blit opaque pixels on one line */ \ | |
| 1198 do { \ | |
| 1199 unsigned run; \ | |
| 1200 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1201 run = ((Ctype *)srcbuf)[1]; \ | |
| 1202 srcbuf += 2 * sizeof(Ctype); \ | |
| 1203 if(run) { \ | |
|
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|
1204 PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \ |
|
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|
1205 run, sizeof(Ptype)); \ |
| 0 | 1206 srcbuf += run * sizeof(Ptype); \ |
| 1207 ofs += run; \ | |
| 1208 } else if(!ofs) \ | |
| 1209 goto done; \ | |
| 1210 } while(ofs < w); \ | |
| 1211 /* skip padding if necessary */ \ | |
| 1212 if(sizeof(Ptype) == 2) \ | |
| 1213 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1214 /* blit translucent pixels on the same line */ \ | |
| 1215 ofs = 0; \ | |
| 1216 do { \ | |
| 1217 unsigned run; \ | |
| 1218 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1219 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1220 srcbuf += 4; \ | |
| 1221 if(run) { \ | |
| 1222 Ptype *dst = (Ptype *)dstbuf + ofs; \ | |
| 1223 unsigned i; \ | |
| 1224 for(i = 0; i < run; i++) { \ | |
| 1225 Uint32 src = *(Uint32 *)srcbuf; \ | |
| 1226 do_blend(src, *dst); \ | |
| 1227 srcbuf += 4; \ | |
| 1228 dst++; \ | |
| 1229 } \ | |
| 1230 ofs += run; \ | |
| 1231 } \ | |
| 1232 } while(ofs < w); \ | |
| 1233 dstbuf += dst->pitch; \ | |
| 1234 } while(--linecount); \ | |
| 1235 } while(0) | |
| 1236 | |
| 1237 switch(df->BytesPerPixel) { | |
| 1238 case 2: | |
| 1239 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1240 || df->Bmask == 0x07e0) | |
| 1241 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1242 else | |
| 1243 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1244 break; | |
| 1245 case 4: | |
| 1246 RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1247 break; | |
| 1248 } | |
| 1249 } | |
| 1250 | |
| 1251 done: | |
| 1252 /* Unlock the destination if necessary */ | |
|
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|
1253 if ( SDL_MUSTLOCK(dst) ) { |
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|
1254 SDL_UnlockSurface(dst); |
| 0 | 1255 } |
| 1256 return 0; | |
| 1257 } | |
| 1258 | |
| 1259 /* | |
| 1260 * Auxiliary functions: | |
| 1261 * The encoding functions take 32bpp rgb + a, and | |
| 1262 * return the number of bytes copied to the destination. | |
| 1263 * The decoding functions copy to 32bpp rgb + a, and | |
| 1264 * return the number of bytes copied from the source. | |
| 1265 * These are only used in the encoder and un-RLE code and are therefore not | |
| 1266 * highly optimised. | |
| 1267 */ | |
| 1268 | |
| 1269 /* encode 32bpp rgb + a into 16bpp rgb, losing alpha */ | |
| 1270 static int copy_opaque_16(void *dst, Uint32 *src, int n, | |
| 1271 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1272 { | |
| 1273 int i; | |
| 1274 Uint16 *d = dst; | |
| 1275 for(i = 0; i < n; i++) { | |
| 1276 unsigned r, g, b; | |
| 1277 RGB_FROM_PIXEL(*src, sfmt, r, g, b); | |
| 1278 PIXEL_FROM_RGB(*d, dfmt, r, g, b); | |
| 1279 src++; | |
| 1280 d++; | |
| 1281 } | |
| 1282 return n * 2; | |
| 1283 } | |
| 1284 | |
| 1285 /* decode opaque pixels from 16bpp to 32bpp rgb + a */ | |
| 1286 static int uncopy_opaque_16(Uint32 *dst, void *src, int n, | |
| 1287 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1288 { | |
| 1289 int i; | |
| 1290 Uint16 *s = src; | |
| 1291 unsigned alpha = dfmt->Amask ? 255 : 0; | |
| 1292 for(i = 0; i < n; i++) { | |
| 1293 unsigned r, g, b; | |
| 1294 RGB_FROM_PIXEL(*s, sfmt, r, g, b); | |
| 1295 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha); | |
| 1296 s++; | |
| 1297 dst++; | |
| 1298 } | |
| 1299 return n * 2; | |
| 1300 } | |
| 1301 | |
| 1302 | |
| 1303 | |
| 1304 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */ | |
| 1305 static int copy_transl_565(void *dst, Uint32 *src, int n, | |
| 1306 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1307 { | |
| 1308 int i; | |
| 1309 Uint32 *d = dst; | |
| 1310 for(i = 0; i < n; i++) { | |
| 1311 unsigned r, g, b, a; | |
| 1312 Uint16 pix; | |
| 1313 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1314 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1315 *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0); | |
| 1316 src++; | |
| 1317 d++; | |
| 1318 } | |
| 1319 return n * 4; | |
| 1320 } | |
| 1321 | |
| 1322 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */ | |
| 1323 static int copy_transl_555(void *dst, Uint32 *src, int n, | |
| 1324 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1325 { | |
| 1326 int i; | |
| 1327 Uint32 *d = dst; | |
| 1328 for(i = 0; i < n; i++) { | |
| 1329 unsigned r, g, b, a; | |
| 1330 Uint16 pix; | |
| 1331 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1332 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1333 *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0); | |
| 1334 src++; | |
| 1335 d++; | |
| 1336 } | |
| 1337 return n * 4; | |
| 1338 } | |
| 1339 | |
| 1340 /* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */ | |
| 1341 static int uncopy_transl_16(Uint32 *dst, void *src, int n, | |
| 1342 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1343 { | |
| 1344 int i; | |
| 1345 Uint32 *s = src; | |
| 1346 for(i = 0; i < n; i++) { | |
| 1347 unsigned r, g, b, a; | |
| 1348 Uint32 pix = *s++; | |
| 1349 a = (pix & 0x3e0) >> 2; | |
| 1350 pix = (pix & ~0x3e0) | pix >> 16; | |
| 1351 RGB_FROM_PIXEL(pix, sfmt, r, g, b); | |
| 1352 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1353 dst++; | |
| 1354 } | |
| 1355 return n * 4; | |
| 1356 } | |
| 1357 | |
| 1358 /* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1359 static int copy_32(void *dst, Uint32 *src, int n, | |
| 1360 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1361 { | |
| 1362 int i; | |
| 1363 Uint32 *d = dst; | |
| 1364 for(i = 0; i < n; i++) { | |
| 1365 unsigned r, g, b, a; | |
| 1366 Uint32 pixel; | |
| 1367 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1368 PIXEL_FROM_RGB(pixel, dfmt, r, g, b); | |
| 1369 *d++ = pixel | a << 24; | |
| 1370 src++; | |
| 1371 } | |
| 1372 return n * 4; | |
| 1373 } | |
| 1374 | |
| 1375 /* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1376 static int uncopy_32(Uint32 *dst, void *src, int n, | |
| 1377 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1378 { | |
| 1379 int i; | |
| 1380 Uint32 *s = src; | |
| 1381 for(i = 0; i < n; i++) { | |
| 1382 unsigned r, g, b, a; | |
| 1383 Uint32 pixel = *s++; | |
| 1384 RGB_FROM_PIXEL(pixel, sfmt, r, g, b); | |
| 1385 a = pixel >> 24; | |
| 1386 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1387 dst++; | |
| 1388 } | |
| 1389 return n * 4; | |
| 1390 } | |
| 1391 | |
| 1392 #define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255) | |
| 1393 | |
| 1394 #define ISTRANSL(pixel, fmt) \ | |
| 1395 ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U) | |
| 1396 | |
| 1397 /* convert surface to be quickly alpha-blittable onto dest, if possible */ | |
| 1398 static int RLEAlphaSurface(SDL_Surface *surface) | |
| 1399 { | |
| 1400 SDL_Surface *dest; | |
| 1401 SDL_PixelFormat *df; | |
| 1402 int maxsize = 0; | |
| 1403 int max_opaque_run; | |
| 1404 int max_transl_run = 65535; | |
| 1405 unsigned masksum; | |
| 1406 Uint8 *rlebuf, *dst; | |
| 1407 int (*copy_opaque)(void *, Uint32 *, int, | |
| 1408 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1409 int (*copy_transl)(void *, Uint32 *, int, | |
| 1410 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1411 | |
| 1412 dest = surface->map->dst; | |
| 1413 if(!dest) | |
| 1414 return -1; | |
| 1415 df = dest->format; | |
| 1416 if(surface->format->BitsPerPixel != 32) | |
| 1417 return -1; /* only 32bpp source supported */ | |
| 1418 | |
| 1419 /* find out whether the destination is one we support, | |
| 1420 and determine the max size of the encoded result */ | |
| 1421 masksum = df->Rmask | df->Gmask | df->Bmask; | |
| 1422 switch(df->BytesPerPixel) { | |
| 1423 case 2: | |
| 1424 /* 16bpp: only support 565 and 555 formats */ | |
| 1425 switch(masksum) { | |
| 1426 case 0xffff: | |
| 1427 if(df->Gmask == 0x07e0 | |
| 1428 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) { | |
| 1429 copy_opaque = copy_opaque_16; | |
| 1430 copy_transl = copy_transl_565; | |
| 1431 } else | |
| 1432 return -1; | |
| 1433 break; | |
| 1434 case 0x7fff: | |
| 1435 if(df->Gmask == 0x03e0 | |
| 1436 || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) { | |
| 1437 copy_opaque = copy_opaque_16; | |
| 1438 copy_transl = copy_transl_555; | |
| 1439 } else | |
| 1440 return -1; | |
| 1441 break; | |
| 1442 default: | |
| 1443 return -1; | |
| 1444 } | |
| 1445 max_opaque_run = 255; /* runs stored as bytes */ | |
| 1446 | |
| 1447 /* worst case is alternating opaque and translucent pixels, | |
| 1448 with room for alignment padding between lines */ | |
| 1449 maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2; | |
| 1450 break; | |
| 1451 case 4: | |
| 1452 if(masksum != 0x00ffffff) | |
| 1453 return -1; /* requires unused high byte */ | |
| 1454 copy_opaque = copy_32; | |
| 1455 copy_transl = copy_32; | |
| 1456 max_opaque_run = 255; /* runs stored as short ints */ | |
| 1457 | |
| 1458 /* worst case is alternating opaque and translucent pixels */ | |
| 1459 maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4; | |
| 1460 break; | |
| 1461 default: | |
| 1462 return -1; /* anything else unsupported right now */ | |
| 1463 } | |
| 1464 | |
| 1465 maxsize += sizeof(RLEDestFormat); | |
|
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diff
changeset
|
1466 rlebuf = (Uint8 *)SDL_malloc(maxsize); |
| 0 | 1467 if(!rlebuf) { |
| 1468 SDL_OutOfMemory(); | |
| 1469 return -1; | |
| 1470 } | |
| 1471 { | |
| 1472 /* save the destination format so we can undo the encoding later */ | |
| 1473 RLEDestFormat *r = (RLEDestFormat *)rlebuf; | |
| 1474 r->BytesPerPixel = df->BytesPerPixel; | |
| 1475 r->Rloss = df->Rloss; | |
| 1476 r->Gloss = df->Gloss; | |
| 1477 r->Bloss = df->Bloss; | |
| 1478 r->Rshift = df->Rshift; | |
| 1479 r->Gshift = df->Gshift; | |
| 1480 r->Bshift = df->Bshift; | |
| 1481 r->Ashift = df->Ashift; | |
| 1482 r->Rmask = df->Rmask; | |
| 1483 r->Gmask = df->Gmask; | |
| 1484 r->Bmask = df->Bmask; | |
| 1485 r->Amask = df->Amask; | |
| 1486 } | |
| 1487 dst = rlebuf + sizeof(RLEDestFormat); | |
| 1488 | |
| 1489 /* Do the actual encoding */ | |
| 1490 { | |
| 1491 int x, y; | |
| 1492 int h = surface->h, w = surface->w; | |
| 1493 SDL_PixelFormat *sf = surface->format; | |
|
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|
1494 Uint32 *src = (Uint32 *)surface->pixels; |
| 0 | 1495 Uint8 *lastline = dst; /* end of last non-blank line */ |
| 1496 | |
| 1497 /* opaque counts are 8 or 16 bits, depending on target depth */ | |
| 1498 #define ADD_OPAQUE_COUNTS(n, m) \ | |
| 1499 if(df->BytesPerPixel == 4) { \ | |
| 1500 ((Uint16 *)dst)[0] = n; \ | |
| 1501 ((Uint16 *)dst)[1] = m; \ | |
| 1502 dst += 4; \ | |
| 1503 } else { \ | |
| 1504 dst[0] = n; \ | |
| 1505 dst[1] = m; \ | |
| 1506 dst += 2; \ | |
| 1507 } | |
| 1508 | |
| 1509 /* translucent counts are always 16 bit */ | |
| 1510 #define ADD_TRANSL_COUNTS(n, m) \ | |
| 1511 (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4) | |
| 1512 | |
| 1513 for(y = 0; y < h; y++) { | |
| 1514 int runstart, skipstart; | |
| 1515 int blankline = 0; | |
| 1516 /* First encode all opaque pixels of a scan line */ | |
| 1517 x = 0; | |
| 1518 do { | |
| 1519 int run, skip, len; | |
| 1520 skipstart = x; | |
| 1521 while(x < w && !ISOPAQUE(src[x], sf)) | |
| 1522 x++; | |
| 1523 runstart = x; | |
| 1524 while(x < w && ISOPAQUE(src[x], sf)) | |
| 1525 x++; | |
| 1526 skip = runstart - skipstart; | |
| 1527 if(skip == w) | |
| 1528 blankline = 1; | |
| 1529 run = x - runstart; | |
| 1530 while(skip > max_opaque_run) { | |
| 1531 ADD_OPAQUE_COUNTS(max_opaque_run, 0); | |
| 1532 skip -= max_opaque_run; | |
| 1533 } | |
| 1534 len = MIN(run, max_opaque_run); | |
| 1535 ADD_OPAQUE_COUNTS(skip, len); | |
| 1536 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1537 runstart += len; | |
| 1538 run -= len; | |
| 1539 while(run) { | |
| 1540 len = MIN(run, max_opaque_run); | |
| 1541 ADD_OPAQUE_COUNTS(0, len); | |
| 1542 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1543 runstart += len; | |
| 1544 run -= len; | |
| 1545 } | |
| 1546 } while(x < w); | |
| 1547 | |
| 1548 /* Make sure the next output address is 32-bit aligned */ | |
| 1549 dst += (unsigned long)dst & 2; | |
| 1550 | |
| 1551 /* Next, encode all translucent pixels of the same scan line */ | |
| 1552 x = 0; | |
| 1553 do { | |
| 1554 int run, skip, len; | |
| 1555 skipstart = x; | |
| 1556 while(x < w && !ISTRANSL(src[x], sf)) | |
| 1557 x++; | |
| 1558 runstart = x; | |
| 1559 while(x < w && ISTRANSL(src[x], sf)) | |
| 1560 x++; | |
| 1561 skip = runstart - skipstart; | |
| 1562 blankline &= (skip == w); | |
| 1563 run = x - runstart; | |
| 1564 while(skip > max_transl_run) { | |
| 1565 ADD_TRANSL_COUNTS(max_transl_run, 0); | |
| 1566 skip -= max_transl_run; | |
| 1567 } | |
| 1568 len = MIN(run, max_transl_run); | |
| 1569 ADD_TRANSL_COUNTS(skip, len); | |
| 1570 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1571 runstart += len; | |
| 1572 run -= len; | |
| 1573 while(run) { | |
| 1574 len = MIN(run, max_transl_run); | |
| 1575 ADD_TRANSL_COUNTS(0, len); | |
| 1576 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1577 runstart += len; | |
| 1578 run -= len; | |
| 1579 } | |
| 1580 if(!blankline) | |
| 1581 lastline = dst; | |
| 1582 } while(x < w); | |
| 1583 | |
| 1584 src += surface->pitch >> 2; | |
| 1585 } | |
| 1586 dst = lastline; /* back up past trailing blank lines */ | |
| 1587 ADD_OPAQUE_COUNTS(0, 0); | |
| 1588 } | |
| 1589 | |
| 1590 #undef ADD_OPAQUE_COUNTS | |
| 1591 #undef ADD_TRANSL_COUNTS | |
| 1592 | |
| 1593 /* Now that we have it encoded, release the original pixels */ | |
| 1594 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1595 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
|
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|
1596 SDL_free( surface->pixels ); |
| 0 | 1597 surface->pixels = NULL; |
| 1598 } | |
| 1599 | |
| 1600 /* realloc the buffer to release unused memory */ | |
| 1601 { | |
|
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1602 Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf); |
| 0 | 1603 if(!p) |
| 1604 p = rlebuf; | |
| 1605 surface->map->sw_data->aux_data = p; | |
| 1606 } | |
| 1607 | |
| 1608 return 0; | |
| 1609 } | |
| 1610 | |
| 1611 static Uint32 getpix_8(Uint8 *srcbuf) | |
| 1612 { | |
| 1613 return *srcbuf; | |
| 1614 } | |
| 1615 | |
| 1616 static Uint32 getpix_16(Uint8 *srcbuf) | |
| 1617 { | |
| 1618 return *(Uint16 *)srcbuf; | |
| 1619 } | |
| 1620 | |
| 1621 static Uint32 getpix_24(Uint8 *srcbuf) | |
| 1622 { | |
|
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Fixed some compiler warnings about "unreachable code" on Watcom C.
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|
1623 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
|
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|
1624 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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|
1625 #else |
|
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Ryan C. Gordon <icculus@icculus.org>
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|
1626 return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2]; |
|
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|
1627 #endif |
| 0 | 1628 } |
| 1629 | |
| 1630 static Uint32 getpix_32(Uint8 *srcbuf) | |
| 1631 { | |
| 1632 return *(Uint32 *)srcbuf; | |
| 1633 } | |
| 1634 | |
| 1635 typedef Uint32 (*getpix_func)(Uint8 *); | |
| 1636 | |
| 1637 static getpix_func getpixes[4] = { | |
| 1638 getpix_8, getpix_16, getpix_24, getpix_32 | |
| 1639 }; | |
| 1640 | |
| 1641 static int RLEColorkeySurface(SDL_Surface *surface) | |
| 1642 { | |
| 1643 Uint8 *rlebuf, *dst; | |
| 1644 int maxn; | |
| 1645 int y; | |
| 1646 Uint8 *srcbuf, *curbuf, *lastline; | |
| 1647 int maxsize = 0; | |
| 1648 int skip, run; | |
| 1649 int bpp = surface->format->BytesPerPixel; | |
| 1650 getpix_func getpix; | |
| 1651 Uint32 ckey, rgbmask; | |
| 1652 int w, h; | |
| 1653 | |
| 1654 /* calculate the worst case size for the compressed surface */ | |
| 1655 switch(bpp) { | |
| 1656 case 1: | |
| 1657 /* worst case is alternating opaque and transparent pixels, | |
| 1658 starting with an opaque pixel */ | |
| 1659 maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2; | |
| 1660 break; | |
| 1661 case 2: | |
| 1662 case 3: | |
| 1663 /* worst case is solid runs, at most 255 pixels wide */ | |
| 1664 maxsize = surface->h * (2 * (surface->w / 255 + 1) | |
| 1665 + surface->w * bpp) + 2; | |
| 1666 break; | |
| 1667 case 4: | |
| 1668 /* worst case is solid runs, at most 65535 pixels wide */ | |
| 1669 maxsize = surface->h * (4 * (surface->w / 65535 + 1) | |
| 1670 + surface->w * 4) + 4; | |
| 1671 break; | |
| 1672 } | |
| 1673 | |
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1674 rlebuf = (Uint8 *)SDL_malloc(maxsize); |
| 0 | 1675 if ( rlebuf == NULL ) { |
| 1676 SDL_OutOfMemory(); | |
| 1677 return(-1); | |
| 1678 } | |
| 1679 | |
| 1680 /* Set up the conversion */ | |
|
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parents:
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diff
changeset
|
1681 srcbuf = (Uint8 *)surface->pixels; |
| 0 | 1682 curbuf = srcbuf; |
| 1683 maxn = bpp == 4 ? 65535 : 255; | |
| 1684 skip = run = 0; | |
| 1685 dst = rlebuf; | |
| 1686 rgbmask = ~surface->format->Amask; | |
| 1687 ckey = surface->format->colorkey & rgbmask; | |
| 1688 lastline = dst; | |
| 1689 getpix = getpixes[bpp - 1]; | |
| 1690 w = surface->w; | |
| 1691 h = surface->h; | |
| 1692 | |
| 1693 #define ADD_COUNTS(n, m) \ | |
| 1694 if(bpp == 4) { \ | |
| 1695 ((Uint16 *)dst)[0] = n; \ | |
| 1696 ((Uint16 *)dst)[1] = m; \ | |
| 1697 dst += 4; \ | |
| 1698 } else { \ | |
| 1699 dst[0] = n; \ | |
| 1700 dst[1] = m; \ | |
| 1701 dst += 2; \ | |
| 1702 } | |
| 1703 | |
| 1704 for(y = 0; y < h; y++) { | |
| 1705 int x = 0; | |
| 1706 int blankline = 0; | |
| 1707 do { | |
| 1708 int run, skip, len; | |
| 1709 int runstart; | |
| 1710 int skipstart = x; | |
| 1711 | |
| 1712 /* find run of transparent, then opaque pixels */ | |
| 1713 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey) | |
| 1714 x++; | |
| 1715 runstart = x; | |
| 1716 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey) | |
| 1717 x++; | |
| 1718 skip = runstart - skipstart; | |
| 1719 if(skip == w) | |
| 1720 blankline = 1; | |
| 1721 run = x - runstart; | |
| 1722 | |
| 1723 /* encode segment */ | |
| 1724 while(skip > maxn) { | |
| 1725 ADD_COUNTS(maxn, 0); | |
| 1726 skip -= maxn; | |
| 1727 } | |
| 1728 len = MIN(run, maxn); | |
| 1729 ADD_COUNTS(skip, len); | |
|
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diff
changeset
|
1730 SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp); |
| 0 | 1731 dst += len * bpp; |
| 1732 run -= len; | |
| 1733 runstart += len; | |
| 1734 while(run) { | |
| 1735 len = MIN(run, maxn); | |
| 1736 ADD_COUNTS(0, len); | |
|
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diff
changeset
|
1737 SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp); |
| 0 | 1738 dst += len * bpp; |
| 1739 runstart += len; | |
| 1740 run -= len; | |
| 1741 } | |
| 1742 if(!blankline) | |
| 1743 lastline = dst; | |
| 1744 } while(x < w); | |
| 1745 | |
| 1746 srcbuf += surface->pitch; | |
| 1747 } | |
| 1748 dst = lastline; /* back up bast trailing blank lines */ | |
| 1749 ADD_COUNTS(0, 0); | |
| 1750 | |
| 1751 #undef ADD_COUNTS | |
| 1752 | |
| 1753 /* Now that we have it encoded, release the original pixels */ | |
| 1754 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1755 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
|
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|
1756 SDL_free( surface->pixels ); |
| 0 | 1757 surface->pixels = NULL; |
| 1758 } | |
| 1759 | |
| 1760 /* realloc the buffer to release unused memory */ | |
| 1761 { | |
| 1762 /* If realloc returns NULL, the original block is left intact */ | |
|
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|
1763 Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf); |
| 0 | 1764 if(!p) |
| 1765 p = rlebuf; | |
| 1766 surface->map->sw_data->aux_data = p; | |
| 1767 } | |
| 1768 | |
| 1769 return(0); | |
| 1770 } | |
| 1771 | |
| 1772 int SDL_RLESurface(SDL_Surface *surface) | |
| 1773 { | |
| 1774 int retcode; | |
| 1775 | |
| 1776 /* Clear any previous RLE conversion */ | |
| 1777 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1778 SDL_UnRLESurface(surface, 1); | |
| 1779 } | |
| 1780 | |
| 1781 /* We don't support RLE encoding of bitmaps */ | |
| 1782 if ( surface->format->BitsPerPixel < 8 ) { | |
| 1783 return(-1); | |
| 1784 } | |
| 1785 | |
| 1786 /* 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
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|
1787 if ( SDL_MUSTLOCK(surface) ) { |
|
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parents:
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|
1788 if ( SDL_LockSurface(surface) < 0 ) { |
| 0 | 1789 return(-1); |
| 1790 } | |
| 1791 } | |
| 1792 | |
| 1793 /* Encode */ | |
| 1794 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1795 retcode = RLEColorkeySurface(surface); | |
| 1796 } else { | |
| 1797 if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 1798 && surface->format->Amask != 0) | |
| 1799 retcode = RLEAlphaSurface(surface); | |
| 1800 else | |
| 1801 retcode = -1; /* no RLE for per-surface alpha sans ckey */ | |
| 1802 } | |
| 1803 | |
| 1804 /* Unlock the surface if it's in hardware */ | |
|
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parents:
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changeset
|
1805 if ( SDL_MUSTLOCK(surface) ) { |
|
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changeset
|
1806 SDL_UnlockSurface(surface); |
| 0 | 1807 } |
| 1808 | |
| 1809 if(retcode < 0) | |
| 1810 return -1; | |
| 1811 | |
| 1812 /* The surface is now accelerated */ | |
| 1813 surface->flags |= SDL_RLEACCEL; | |
| 1814 | |
| 1815 return(0); | |
| 1816 } | |
| 1817 | |
| 1818 /* | |
| 1819 * Un-RLE a surface with pixel alpha | |
| 1820 * This may not give back exactly the image before RLE-encoding; all | |
| 1821 * completely transparent pixels will be lost, and colour and alpha depth | |
| 1822 * may have been reduced (when encoding for 16bpp targets). | |
| 1823 */ | |
|
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Date: Wed, 28 Jul 2004 14:56:57 +0800
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parents:
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diff
changeset
|
1824 static SDL_bool UnRLEAlpha(SDL_Surface *surface) |
| 0 | 1825 { |
| 1826 Uint8 *srcbuf; | |
| 1827 Uint32 *dst; | |
| 1828 SDL_PixelFormat *sf = surface->format; | |
| 1829 RLEDestFormat *df = surface->map->sw_data->aux_data; | |
| 1830 int (*uncopy_opaque)(Uint32 *, void *, int, | |
| 1831 RLEDestFormat *, SDL_PixelFormat *); | |
| 1832 int (*uncopy_transl)(Uint32 *, void *, int, | |
| 1833 RLEDestFormat *, SDL_PixelFormat *); | |
| 1834 int w = surface->w; | |
| 1835 int bpp = df->BytesPerPixel; | |
| 1836 | |
| 1837 if(bpp == 2) { | |
| 1838 uncopy_opaque = uncopy_opaque_16; | |
| 1839 uncopy_transl = uncopy_transl_16; | |
| 1840 } else { | |
| 1841 uncopy_opaque = uncopy_transl = uncopy_32; | |
| 1842 } | |
| 1843 | |
|
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|
1844 surface->pixels = SDL_malloc(surface->h * surface->pitch); |
|
944
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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parents:
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diff
changeset
|
1845 if ( !surface->pixels ) { |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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diff
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|
1846 return(SDL_FALSE); |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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parents:
880
diff
changeset
|
1847 } |
| 0 | 1848 /* fill background with transparent pixels */ |
|
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|
1849 SDL_memset(surface->pixels, 0, surface->h * surface->pitch); |
| 0 | 1850 |
| 1851 dst = surface->pixels; | |
| 1852 srcbuf = (Uint8 *)(df + 1); | |
| 1853 for(;;) { | |
| 1854 /* copy opaque pixels */ | |
| 1855 int ofs = 0; | |
| 1856 do { | |
| 1857 unsigned run; | |
| 1858 if(bpp == 2) { | |
| 1859 ofs += srcbuf[0]; | |
| 1860 run = srcbuf[1]; | |
| 1861 srcbuf += 2; | |
| 1862 } else { | |
| 1863 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1864 run = ((Uint16 *)srcbuf)[1]; | |
| 1865 srcbuf += 4; | |
| 1866 } | |
| 1867 if(run) { | |
| 1868 srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf); | |
| 1869 ofs += run; | |
| 1870 } else if(!ofs) | |
|
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diff
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|
1871 return(SDL_TRUE); |
| 0 | 1872 } while(ofs < w); |
| 1873 | |
| 1874 /* skip padding if needed */ | |
| 1875 if(bpp == 2) | |
| 1876 srcbuf += (unsigned long)srcbuf & 2; | |
| 1877 | |
| 1878 /* copy translucent pixels */ | |
| 1879 ofs = 0; | |
| 1880 do { | |
| 1881 unsigned run; | |
| 1882 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1883 run = ((Uint16 *)srcbuf)[1]; | |
| 1884 srcbuf += 4; | |
| 1885 if(run) { | |
| 1886 srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf); | |
| 1887 ofs += run; | |
| 1888 } | |
| 1889 } while(ofs < w); | |
| 1890 dst += surface->pitch >> 2; | |
| 1891 } | |
|
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|
1892 /* Make the compiler happy */ |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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1893 return(SDL_TRUE); |
| 0 | 1894 } |
| 1895 | |
| 1896 void SDL_UnRLESurface(SDL_Surface *surface, int recode) | |
| 1897 { | |
| 1898 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1899 surface->flags &= ~SDL_RLEACCEL; | |
| 1900 | |
| 1901 if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1902 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1903 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1904 SDL_Rect full; | |
| 1905 unsigned alpha_flag; | |
| 1906 | |
| 1907 /* re-create the original surface */ | |
|
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1908 surface->pixels = SDL_malloc(surface->h * surface->pitch); |
|
944
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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parents:
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|
1909 if ( !surface->pixels ) { |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
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changeset
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1910 /* 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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1911 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
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1912 return; |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1913 } |
| 0 | 1914 |
| 1915 /* fill it with the background colour */ | |
| 1916 SDL_FillRect(surface, NULL, surface->format->colorkey); | |
| 1917 | |
| 1918 /* now render the encoded surface */ | |
| 1919 full.x = full.y = 0; | |
| 1920 full.w = surface->w; | |
| 1921 full.h = surface->h; | |
| 1922 alpha_flag = surface->flags & SDL_SRCALPHA; | |
| 1923 surface->flags &= ~SDL_SRCALPHA; /* opaque blit */ | |
| 1924 SDL_RLEBlit(surface, &full, surface, &full); | |
| 1925 surface->flags |= alpha_flag; | |
|
944
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1926 } else { |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1927 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
|
1928 /* Oh crap... */ |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1929 surface->flags |= SDL_RLEACCEL; |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1930 return; |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1931 } |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1932 } |
| 0 | 1933 } |
| 1934 | |
| 1935 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>
parents:
1330
diff
changeset
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1936 SDL_free(surface->map->sw_data->aux_data); |
| 0 | 1937 surface->map->sw_data->aux_data = NULL; |
| 1938 } | |
| 1939 } | |
| 1940 } | |
| 1941 | |
| 1942 |