Mercurial > sdl-ios-xcode
annotate src/video/SDL_RLEaccel.c @ 1355:4d0f2b2147cf
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 03:00:38 +0000 |
| parents | 604d73db6802 |
| children | c71e05b4dc2e |
| 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_types.h" | |
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89 #include "SDL_stdlib.h" |
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90 #include "SDL_string.h" |
| 0 | 91 #include "SDL_video.h" |
| 92 #include "SDL_error.h" | |
| 93 #include "SDL_sysvideo.h" | |
| 94 #include "SDL_blit.h" | |
| 95 #include "SDL_RLEaccel_c.h" | |
| 96 | |
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97 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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98 #define MMX_ASMBLIT |
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99 #endif |
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100 |
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101 #ifdef MMX_ASMBLIT |
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102 #include "mmx.h" |
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103 #include "SDL_cpuinfo.h" |
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104 #endif |
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105 |
| 0 | 106 #ifndef MAX |
| 107 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 108 #endif | |
| 109 #ifndef MIN | |
| 110 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 111 #endif | |
| 112 | |
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113 #define PIXEL_COPY(to, from, len, bpp) \ |
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114 do { \ |
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115 if(bpp == 4) { \ |
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116 SDL_memcpy4(to, from, (unsigned)(len)); \ |
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117 } else { \ |
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118 SDL_memcpy(to, from, (unsigned)(len) * (bpp)); \ |
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119 } \ |
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120 } while(0) |
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121 |
| 0 | 122 /* |
| 123 * Various colorkey blit methods, for opaque and per-surface alpha | |
| 124 */ | |
| 125 | |
| 126 #define OPAQUE_BLIT(to, from, length, bpp, alpha) \ | |
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127 PIXEL_COPY(to, from, length, bpp) |
| 0 | 128 |
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129 #ifdef MMX_ASMBLIT |
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130 |
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131 #define ALPHA_BLIT32_888MMX(to, from, length, bpp, alpha) \ |
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132 do { \ |
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133 Uint32 *srcp = (Uint32 *)(from); \ |
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134 Uint32 *dstp = (Uint32 *)(to); \ |
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135 int i = 0x00FF00FF; \ |
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136 movd_m2r(*(&i), mm3); \ |
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137 punpckldq_r2r(mm3, mm3); \ |
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138 i = 0xFF000000; \ |
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139 movd_m2r(*(&i), mm7); \ |
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140 punpckldq_r2r(mm7, mm7); \ |
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141 i = alpha | alpha << 16; \ |
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142 movd_m2r(*(&i), mm4); \ |
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143 punpckldq_r2r(mm4, mm4); \ |
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144 pcmpeqd_r2r(mm5,mm5); /* set mm5 to "1" */ \ |
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145 pxor_r2r(mm7, mm5); /* make clear alpha mask */ \ |
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146 i = length; \ |
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147 if(i & 1) { \ |
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148 movd_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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149 punpcklbw_r2r(mm1, mm1); \ |
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150 pand_r2r(mm3, mm1); \ |
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151 movd_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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152 punpcklbw_r2r(mm2, mm2); \ |
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153 pand_r2r(mm3, mm2); \ |
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154 psubw_r2r(mm2, mm1); \ |
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155 pmullw_r2r(mm4, mm1); \ |
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156 psrlw_i2r(8, mm1); \ |
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157 paddw_r2r(mm1, mm2); \ |
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158 pand_r2r(mm3, mm2); \ |
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159 packuswb_r2r(mm2, mm2); \ |
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160 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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161 movd_r2m(mm2, *dstp); \ |
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162 ++srcp; \ |
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163 ++dstp; \ |
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164 i--; \ |
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165 } \ |
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166 for(; i > 0; --i) { \ |
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167 movq_m2r((*srcp), mm0); \ |
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168 movq_r2r(mm0, mm1); \ |
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169 punpcklbw_r2r(mm0, mm0); \ |
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170 movq_m2r((*dstp), mm2); \ |
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171 punpckhbw_r2r(mm1, mm1); \ |
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172 movq_r2r(mm2, mm6); \ |
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173 pand_r2r(mm3, mm0); \ |
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174 punpcklbw_r2r(mm2, mm2); \ |
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175 pand_r2r(mm3, mm1); \ |
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176 punpckhbw_r2r(mm6, mm6); \ |
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177 pand_r2r(mm3, mm2); \ |
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178 psubw_r2r(mm2, mm0); \ |
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179 pmullw_r2r(mm4, mm0); \ |
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180 pand_r2r(mm3, mm6); \ |
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181 psubw_r2r(mm6, mm1); \ |
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182 pmullw_r2r(mm4, mm1); \ |
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183 psrlw_i2r(8, mm0); \ |
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184 paddw_r2r(mm0, mm2); \ |
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185 psrlw_i2r(8, mm1); \ |
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186 paddw_r2r(mm1, mm6); \ |
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187 pand_r2r(mm3, mm2); \ |
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188 pand_r2r(mm3, mm6); \ |
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189 packuswb_r2r(mm2, mm2); \ |
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190 packuswb_r2r(mm6, mm6); \ |
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191 psrlq_i2r(32, mm2); \ |
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192 psllq_i2r(32, mm6); \ |
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193 por_r2r(mm6, mm2); \ |
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194 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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195 movq_r2m(mm2, *dstp); \ |
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196 srcp += 2; \ |
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197 dstp += 2; \ |
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198 i--; \ |
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199 } \ |
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200 emms(); \ |
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201 } while(0) |
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202 |
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203 #define ALPHA_BLIT16_565MMX(to, from, length, bpp, alpha) \ |
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204 do { \ |
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205 int i, n = 0; \ |
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206 Uint16 *srcp = (Uint16 *)(from); \ |
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207 Uint16 *dstp = (Uint16 *)(to); \ |
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208 Uint32 ALPHA = 0xF800; \ |
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209 movd_m2r(*(&ALPHA), mm1); \ |
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210 punpcklwd_r2r(mm1, mm1); \ |
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211 punpcklwd_r2r(mm1, mm1); \ |
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212 ALPHA = 0x07E0; \ |
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213 movd_m2r(*(&ALPHA), mm4); \ |
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214 punpcklwd_r2r(mm4, mm4); \ |
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215 punpcklwd_r2r(mm4, mm4); \ |
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216 ALPHA = 0x001F; \ |
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217 movd_m2r(*(&ALPHA), mm7); \ |
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218 punpcklwd_r2r(mm7, mm7); \ |
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219 punpcklwd_r2r(mm7, mm7); \ |
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220 alpha &= ~(1+2+4); \ |
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221 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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222 movd_m2r(*(&i), mm0); \ |
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223 punpckldq_r2r(mm0, mm0); \ |
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224 ALPHA = alpha >> 3; \ |
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225 i = ((int)(length) & 3); \ |
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226 for(; i > 0; --i) { \ |
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227 Uint32 s = *srcp++; \ |
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228 Uint32 d = *dstp; \ |
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229 s = (s | s << 16) & 0x07e0f81f; \ |
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230 d = (d | d << 16) & 0x07e0f81f; \ |
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231 d += (s - d) * ALPHA >> 5; \ |
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232 d &= 0x07e0f81f; \ |
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233 *dstp++ = d | d >> 16; \ |
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234 n++; \ |
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235 } \ |
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236 i = (int)(length) - n; \ |
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237 for(; i > 0; --i) { \ |
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238 movq_m2r((*dstp), mm3); \ |
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239 movq_m2r((*srcp), mm2); \ |
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240 movq_r2r(mm2, mm5); \ |
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241 pand_r2r(mm1 , mm5); \ |
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242 psrlq_i2r(11, mm5); \ |
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243 movq_r2r(mm3, mm6); \ |
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244 pand_r2r(mm1 , mm6); \ |
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245 psrlq_i2r(11, mm6); \ |
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246 psubw_r2r(mm6, mm5); \ |
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247 pmullw_r2r(mm0, mm5); \ |
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248 psrlw_i2r(8, mm5); \ |
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249 paddw_r2r(mm5, mm6); \ |
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250 psllq_i2r(11, mm6); \ |
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251 pand_r2r(mm1, mm6); \ |
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252 movq_r2r(mm4, mm5); \ |
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253 por_r2r(mm7, mm5); \ |
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254 pand_r2r(mm5, mm3); \ |
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255 por_r2r(mm6, mm3); \ |
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256 movq_r2r(mm2, mm5); \ |
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257 pand_r2r(mm4 , mm5); \ |
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258 psrlq_i2r(5, mm5); \ |
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259 movq_r2r(mm3, mm6); \ |
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260 pand_r2r(mm4 , mm6); \ |
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261 psrlq_i2r(5, mm6); \ |
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262 psubw_r2r(mm6, mm5); \ |
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263 pmullw_r2r(mm0, mm5); \ |
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264 psrlw_i2r(8, mm5); \ |
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265 paddw_r2r(mm5, mm6); \ |
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266 psllq_i2r(5, mm6); \ |
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267 pand_r2r(mm4, mm6); \ |
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268 movq_r2r(mm1, mm5); \ |
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269 por_r2r(mm7, mm5); \ |
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270 pand_r2r(mm5, mm3); \ |
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271 por_r2r(mm6, mm3); \ |
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272 movq_r2r(mm2, mm5); \ |
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273 pand_r2r(mm7 , mm5); \ |
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274 movq_r2r(mm3, mm6); \ |
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275 pand_r2r(mm7 , mm6); \ |
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276 psubw_r2r(mm6, mm5); \ |
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277 pmullw_r2r(mm0, mm5); \ |
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278 psrlw_i2r(8, mm5); \ |
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279 paddw_r2r(mm5, mm6); \ |
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280 pand_r2r(mm7, mm6); \ |
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281 movq_r2r(mm1, mm5); \ |
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282 por_r2r(mm4, mm5); \ |
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283 pand_r2r(mm5, mm3); \ |
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284 por_r2r(mm6, mm3); \ |
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285 movq_r2m(mm3, *dstp); \ |
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286 srcp += 4; \ |
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287 dstp += 4; \ |
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288 i -= 3; \ |
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289 } \ |
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290 emms(); \ |
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291 } while(0) |
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292 |
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293 #define ALPHA_BLIT16_555MMX(to, from, length, bpp, alpha) \ |
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294 do { \ |
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295 int i, n = 0; \ |
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296 Uint16 *srcp = (Uint16 *)(from); \ |
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297 Uint16 *dstp = (Uint16 *)(to); \ |
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298 Uint32 ALPHA = 0x7C00; \ |
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299 movd_m2r(*(&ALPHA), mm1); \ |
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300 punpcklwd_r2r(mm1, mm1); \ |
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301 punpcklwd_r2r(mm1, mm1); \ |
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302 ALPHA = 0x03E0; \ |
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303 movd_m2r(*(&ALPHA), mm4); \ |
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304 punpcklwd_r2r(mm4, mm4); \ |
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305 punpcklwd_r2r(mm4, mm4); \ |
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306 ALPHA = 0x001F; \ |
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307 movd_m2r(*(&ALPHA), mm7); \ |
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308 punpcklwd_r2r(mm7, mm7); \ |
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309 punpcklwd_r2r(mm7, mm7); \ |
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310 alpha &= ~(1+2+4); \ |
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311 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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312 movd_m2r(*(&i), mm0); \ |
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313 punpckldq_r2r(mm0, mm0); \ |
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314 i = ((int)(length) & 3); \ |
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315 ALPHA = alpha >> 3; \ |
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316 for(; i > 0; --i) { \ |
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317 Uint32 s = *srcp++; \ |
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318 Uint32 d = *dstp; \ |
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319 s = (s | s << 16) & 0x03e07c1f; \ |
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320 d = (d | d << 16) & 0x03e07c1f; \ |
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321 d += (s - d) * ALPHA >> 5; \ |
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322 d &= 0x03e07c1f; \ |
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323 *dstp++ = d | d >> 16; \ |
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324 n++; \ |
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325 } \ |
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326 i = (int)(length) - n; \ |
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327 for(; i > 0; --i) { \ |
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328 movq_m2r((*dstp), mm3); \ |
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329 movq_m2r((*srcp), mm2); \ |
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330 movq_r2r(mm2, mm5); \ |
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331 pand_r2r(mm1 , mm5); \ |
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332 psrlq_i2r(10, mm5); \ |
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333 movq_r2r(mm3, mm6); \ |
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334 pand_r2r(mm1 , mm6); \ |
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335 psrlq_i2r(10, mm6); \ |
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336 psubw_r2r(mm6, mm5); \ |
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337 pmullw_r2r(mm0, mm5); \ |
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338 psrlw_i2r(8, mm5); \ |
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339 paddw_r2r(mm5, mm6); \ |
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340 psllq_i2r(10, mm6); \ |
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341 pand_r2r(mm1, mm6); \ |
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342 movq_r2r(mm4, mm5); \ |
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343 por_r2r(mm7, mm5); \ |
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344 pand_r2r(mm5, mm3); \ |
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345 por_r2r(mm6, mm3); \ |
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346 movq_r2r(mm2, mm5); \ |
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347 pand_r2r(mm4 , mm5); \ |
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348 psrlq_i2r(5, mm5); \ |
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349 movq_r2r(mm3, mm6); \ |
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350 pand_r2r(mm4 , mm6); \ |
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351 psrlq_i2r(5, mm6); \ |
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352 psubw_r2r(mm6, mm5); \ |
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353 pmullw_r2r(mm0, mm5); \ |
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354 psrlw_i2r(8, mm5); \ |
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355 paddw_r2r(mm5, mm6); \ |
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356 psllq_i2r(5, mm6); \ |
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357 pand_r2r(mm4, mm6); \ |
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358 movq_r2r(mm1, mm5); \ |
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359 por_r2r(mm7, mm5); \ |
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360 pand_r2r(mm5, mm3); \ |
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361 por_r2r(mm6, mm3); \ |
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362 movq_r2r(mm2, mm5); \ |
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363 pand_r2r(mm7 , mm5); \ |
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364 movq_r2r(mm3, mm6); \ |
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365 pand_r2r(mm7 , mm6); \ |
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366 psubw_r2r(mm6, mm5); \ |
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367 pmullw_r2r(mm0, mm5); \ |
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368 psrlw_i2r(8, mm5); \ |
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369 paddw_r2r(mm5, mm6); \ |
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370 pand_r2r(mm7, mm6); \ |
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371 movq_r2r(mm1, mm5); \ |
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372 por_r2r(mm4, mm5); \ |
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373 pand_r2r(mm5, mm3); \ |
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374 por_r2r(mm6, mm3); \ |
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375 movq_r2m(mm3, *dstp); \ |
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376 srcp += 4; \ |
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377 dstp += 4; \ |
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378 i -= 3; \ |
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379 } \ |
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380 emms(); \ |
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381 } while(0) |
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382 |
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383 #endif |
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384 |
| 0 | 385 /* |
| 386 * For 32bpp pixels on the form 0x00rrggbb: | |
| 387 * If we treat the middle component separately, we can process the two | |
| 388 * remaining in parallel. This is safe to do because of the gap to the left | |
| 389 * of each component, so the bits from the multiplication don't collide. | |
| 390 * This can be used for any RGB permutation of course. | |
| 391 */ | |
| 392 #define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \ | |
| 393 do { \ | |
| 394 int i; \ | |
| 395 Uint32 *src = (Uint32 *)(from); \ | |
| 396 Uint32 *dst = (Uint32 *)(to); \ | |
| 397 for(i = 0; i < (int)(length); i++) { \ | |
| 398 Uint32 s = *src++; \ | |
| 399 Uint32 d = *dst; \ | |
| 400 Uint32 s1 = s & 0xff00ff; \ | |
| 401 Uint32 d1 = d & 0xff00ff; \ | |
| 402 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 403 s &= 0xff00; \ | |
| 404 d &= 0xff00; \ | |
| 405 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 406 *dst++ = d1 | d; \ | |
| 407 } \ | |
| 408 } while(0) | |
| 409 | |
| 410 /* | |
| 411 * For 16bpp pixels we can go a step further: put the middle component | |
| 412 * in the high 16 bits of a 32 bit word, and process all three RGB | |
| 413 * components at the same time. Since the smallest gap is here just | |
| 414 * 5 bits, we have to scale alpha down to 5 bits as well. | |
| 415 */ | |
| 416 #define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \ | |
| 417 do { \ | |
| 418 int i; \ | |
| 419 Uint16 *src = (Uint16 *)(from); \ | |
| 420 Uint16 *dst = (Uint16 *)(to); \ | |
|
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421 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 422 for(i = 0; i < (int)(length); i++) { \ |
| 423 Uint32 s = *src++; \ | |
| 424 Uint32 d = *dst; \ | |
| 425 s = (s | s << 16) & 0x07e0f81f; \ | |
| 426 d = (d | d << 16) & 0x07e0f81f; \ | |
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427 d += (s - d) * ALPHA >> 5; \ |
| 0 | 428 d &= 0x07e0f81f; \ |
| 429 *dst++ = d | d >> 16; \ | |
| 430 } \ | |
| 431 } while(0) | |
| 432 | |
| 433 #define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \ | |
| 434 do { \ | |
| 435 int i; \ | |
| 436 Uint16 *src = (Uint16 *)(from); \ | |
| 437 Uint16 *dst = (Uint16 *)(to); \ | |
|
689
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438 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 439 for(i = 0; i < (int)(length); i++) { \ |
| 440 Uint32 s = *src++; \ | |
| 441 Uint32 d = *dst; \ | |
| 442 s = (s | s << 16) & 0x03e07c1f; \ | |
| 443 d = (d | d << 16) & 0x03e07c1f; \ | |
|
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444 d += (s - d) * ALPHA >> 5; \ |
| 0 | 445 d &= 0x03e07c1f; \ |
| 446 *dst++ = d | d >> 16; \ | |
| 447 } \ | |
| 448 } while(0) | |
| 449 | |
| 450 /* | |
| 451 * The general slow catch-all function, for remaining depths and formats | |
| 452 */ | |
| 453 #define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \ | |
| 454 do { \ | |
| 455 int i; \ | |
| 456 Uint8 *src = from; \ | |
| 457 Uint8 *dst = to; \ | |
| 458 for(i = 0; i < (int)(length); i++) { \ | |
| 459 Uint32 s, d; \ | |
| 460 unsigned rs, gs, bs, rd, gd, bd; \ | |
| 461 switch(bpp) { \ | |
| 462 case 2: \ | |
| 463 s = *(Uint16 *)src; \ | |
| 464 d = *(Uint16 *)dst; \ | |
| 465 break; \ | |
| 466 case 3: \ | |
| 467 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 468 s = (src[0] << 16) | (src[1] << 8) | src[2]; \ | |
| 469 d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \ | |
| 470 } else { \ | |
| 471 s = (src[2] << 16) | (src[1] << 8) | src[0]; \ | |
| 472 d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \ | |
| 473 } \ | |
| 474 break; \ | |
| 475 case 4: \ | |
| 476 s = *(Uint32 *)src; \ | |
| 477 d = *(Uint32 *)dst; \ | |
| 478 break; \ | |
| 479 } \ | |
| 480 RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \ | |
| 481 RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \ | |
| 482 rd += (rs - rd) * alpha >> 8; \ | |
| 483 gd += (gs - gd) * alpha >> 8; \ | |
| 484 bd += (bs - bd) * alpha >> 8; \ | |
| 485 PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \ | |
| 486 switch(bpp) { \ | |
| 487 case 2: \ | |
| 488 *(Uint16 *)dst = d; \ | |
| 489 break; \ | |
| 490 case 3: \ | |
| 491 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 492 dst[0] = d >> 16; \ | |
| 493 dst[1] = d >> 8; \ | |
| 494 dst[2] = d; \ | |
| 495 } else { \ | |
| 496 dst[0] = d; \ | |
| 497 dst[1] = d >> 8; \ | |
| 498 dst[2] = d >> 16; \ | |
| 499 } \ | |
| 500 break; \ | |
| 501 case 4: \ | |
| 502 *(Uint32 *)dst = d; \ | |
| 503 break; \ | |
| 504 } \ | |
| 505 src += bpp; \ | |
| 506 dst += bpp; \ | |
| 507 } \ | |
| 508 } while(0) | |
| 509 | |
|
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510 #ifdef MMX_ASMBLIT |
| 0 | 511 |
|
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512 #define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha) \ |
|
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513 do { \ |
|
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514 Uint32 *srcp = (Uint32 *)(from); \ |
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515 Uint32 *dstp = (Uint32 *)(to); \ |
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516 int i = 0x00fefefe; \ |
|
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517 movd_m2r(*(&i), mm4); \ |
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518 punpckldq_r2r(mm4, mm4); \ |
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519 i = 0x00010101; \ |
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520 movd_m2r(*(&i), mm3); \ |
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521 punpckldq_r2r(mm3, mm3); \ |
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522 i = (int)(length); \ |
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523 if( i & 1 ) { \ |
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524 Uint32 s = *srcp++; \ |
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525 Uint32 d = *dstp; \ |
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526 *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ |
|
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527 + (s & d & 0x00010101); \ |
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528 i--; \ |
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529 } \ |
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530 for(; i > 0; --i) { \ |
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531 movq_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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532 movq_r2r(mm2, mm6); /* dst -> mm6 */ \ |
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533 movq_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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534 movq_r2r(mm1, mm5); /* src -> mm5 */ \ |
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535 pand_r2r(mm4, mm6); /* dst & 0x00fefefe -> mm6 */ \ |
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536 pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */ \ |
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537 paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */ \ |
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538 psrld_i2r(1, mm5); \ |
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539 pand_r2r(mm1, mm2); /* s & d -> mm2 */ \ |
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540 pand_r2r(mm3, mm2); /* s & d & 0x00010101 -> mm2 */ \ |
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541 paddd_r2r(mm5, mm2); \ |
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542 movq_r2m(mm2, (*dstp)); \ |
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543 dstp += 2; \ |
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544 srcp += 2; \ |
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545 i--; \ |
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546 } \ |
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547 emms(); \ |
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548 } while(0) |
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549 |
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550 #endif |
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551 |
| 0 | 552 /* |
| 553 * Special case: 50% alpha (alpha=128) | |
| 554 * This is treated specially because it can be optimized very well, and | |
| 555 * since it is good for many cases of semi-translucency. | |
| 556 * The theory is to do all three components at the same time: | |
| 557 * First zero the lowest bit of each component, which gives us room to | |
| 558 * add them. Then shift right and add the sum of the lowest bits. | |
| 559 */ | |
| 560 #define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \ | |
| 561 do { \ | |
| 562 int i; \ | |
| 563 Uint32 *src = (Uint32 *)(from); \ | |
| 564 Uint32 *dst = (Uint32 *)(to); \ | |
| 565 for(i = 0; i < (int)(length); i++) { \ | |
| 566 Uint32 s = *src++; \ | |
| 567 Uint32 d = *dst; \ | |
| 568 *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ | |
| 569 + (s & d & 0x00010101); \ | |
| 570 } \ | |
| 571 } while(0) | |
| 572 | |
| 573 /* | |
| 574 * For 16bpp, we can actually blend two pixels in parallel, if we take | |
| 575 * care to shift before we add, not after. | |
| 576 */ | |
| 577 | |
| 578 /* helper: blend a single 16 bit pixel at 50% */ | |
| 579 #define BLEND16_50(dst, src, mask) \ | |
| 580 do { \ | |
| 581 Uint32 s = *src++; \ | |
| 582 Uint32 d = *dst; \ | |
| 583 *dst++ = (((s & mask) + (d & mask)) >> 1) \ | |
| 584 + (s & d & (~mask & 0xffff)); \ | |
| 585 } while(0) | |
| 586 | |
| 587 /* basic 16bpp blender. mask is the pixels to keep when adding. */ | |
| 588 #define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \ | |
| 589 do { \ | |
| 590 unsigned n = (length); \ | |
| 591 Uint16 *src = (Uint16 *)(from); \ | |
| 592 Uint16 *dst = (Uint16 *)(to); \ | |
| 593 if(((unsigned long)src ^ (unsigned long)dst) & 3) { \ | |
| 594 /* source and destination not in phase, blit one by one */ \ | |
| 595 while(n--) \ | |
| 596 BLEND16_50(dst, src, mask); \ | |
| 597 } else { \ | |
| 598 if((unsigned long)src & 3) { \ | |
| 599 /* first odd pixel */ \ | |
| 600 BLEND16_50(dst, src, mask); \ | |
| 601 n--; \ | |
| 602 } \ | |
| 603 for(; n > 1; n -= 2) { \ | |
| 604 Uint32 s = *(Uint32 *)src; \ | |
| 605 Uint32 d = *(Uint32 *)dst; \ | |
| 606 *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \ | |
| 607 + ((d & (mask | mask << 16)) >> 1) \ | |
| 608 + (s & d & (~(mask | mask << 16))); \ | |
| 609 src += 2; \ | |
| 610 dst += 2; \ | |
| 611 } \ | |
| 612 if(n) \ | |
| 613 BLEND16_50(dst, src, mask); /* last odd pixel */ \ | |
| 614 } \ | |
| 615 } while(0) | |
| 616 | |
| 617 #define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \ | |
| 618 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de) | |
| 619 | |
| 620 #define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \ | |
| 621 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde) | |
| 622 | |
|
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623 #ifdef MMX_ASMBLIT |
| 0 | 624 |
| 625 #define CHOOSE_BLIT(blitter, alpha, fmt) \ | |
| 626 do { \ | |
| 627 if(alpha == 255) { \ | |
| 628 switch(fmt->BytesPerPixel) { \ | |
| 629 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ | |
| 630 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ | |
| 631 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ | |
| 632 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ | |
| 633 } \ | |
| 634 } else { \ | |
| 635 switch(fmt->BytesPerPixel) { \ | |
| 636 case 1: \ | |
| 637 /* No 8bpp alpha blitting */ \ | |
| 638 break; \ | |
| 639 \ | |
| 640 case 2: \ | |
| 641 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ | |
| 642 case 0xffff: \ | |
| 643 if(fmt->Gmask == 0x07e0 \ | |
| 644 || fmt->Rmask == 0x07e0 \ | |
| 645 || fmt->Bmask == 0x07e0) { \ | |
| 646 if(alpha == 128) \ | |
| 647 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ | |
| 648 else { \ | |
|
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649 if(SDL_HasMMX()) \ |
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650 blitter(2, Uint8, ALPHA_BLIT16_565MMX); \ |
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651 else \ |
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652 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
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653 } \ |
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654 } else \ |
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655 goto general16; \ |
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656 break; \ |
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657 \ |
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658 case 0x7fff: \ |
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659 if(fmt->Gmask == 0x03e0 \ |
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660 || fmt->Rmask == 0x03e0 \ |
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661 || fmt->Bmask == 0x03e0) { \ |
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662 if(alpha == 128) \ |
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663 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ |
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664 else { \ |
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665 if(SDL_HasMMX()) \ |
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666 blitter(2, Uint8, ALPHA_BLIT16_555MMX); \ |
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667 else \ |
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668 blitter(2, Uint8, ALPHA_BLIT16_555); \ |
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669 } \ |
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670 break; \ |
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671 } \ |
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672 /* fallthrough */ \ |
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673 \ |
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674 default: \ |
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675 general16: \ |
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676 blitter(2, Uint8, ALPHA_BLIT_ANY); \ |
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677 } \ |
|
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678 break; \ |
|
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679 \ |
|
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680 case 3: \ |
|
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681 blitter(3, Uint8, ALPHA_BLIT_ANY); \ |
|
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682 break; \ |
|
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683 \ |
|
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684 case 4: \ |
|
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685 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ |
|
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686 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ |
|
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687 || fmt->Bmask == 0xff00)) { \ |
|
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688 if(alpha == 128) \ |
|
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689 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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690 if(SDL_HasMMX()) \ |
|
689
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691 blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\ |
|
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692 else \ |
|
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693 blitter(4, Uint16, ALPHA_BLIT32_888_50);\ |
|
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694 } \ |
|
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695 else \ |
|
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696 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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697 if(SDL_HasMMX()) \ |
|
689
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698 blitter(4, Uint16, ALPHA_BLIT32_888MMX);\ |
|
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699 else \ |
|
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700 blitter(4, Uint16, ALPHA_BLIT32_888); \ |
|
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701 } \ |
|
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702 } else \ |
|
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703 blitter(4, Uint16, ALPHA_BLIT_ANY); \ |
|
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704 break; \ |
|
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705 } \ |
|
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706 } \ |
|
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707 } while(0) |
|
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708 |
|
5bb080d35049
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709 #else |
|
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710 |
|
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711 #define CHOOSE_BLIT(blitter, alpha, fmt) \ |
|
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712 do { \ |
|
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713 if(alpha == 255) { \ |
|
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714 switch(fmt->BytesPerPixel) { \ |
|
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715 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ |
|
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716 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ |
|
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717 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ |
|
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718 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ |
|
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719 } \ |
|
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720 } else { \ |
|
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721 switch(fmt->BytesPerPixel) { \ |
|
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722 case 1: \ |
|
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723 /* No 8bpp alpha blitting */ \ |
|
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724 break; \ |
|
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725 \ |
|
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726 case 2: \ |
|
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727 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ |
|
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|
728 case 0xffff: \ |
|
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|
729 if(fmt->Gmask == 0x07e0 \ |
|
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730 || fmt->Rmask == 0x07e0 \ |
|
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731 || fmt->Bmask == 0x07e0) { \ |
|
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|
732 if(alpha == 128) \ |
|
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733 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ |
|
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734 else { \ |
| 0 | 735 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
| 736 } \ | |
| 737 } else \ | |
| 738 goto general16; \ | |
| 739 break; \ | |
| 740 \ | |
| 741 case 0x7fff: \ | |
| 742 if(fmt->Gmask == 0x03e0 \ | |
| 743 || fmt->Rmask == 0x03e0 \ | |
| 744 || fmt->Bmask == 0x03e0) { \ | |
| 745 if(alpha == 128) \ | |
| 746 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ | |
| 747 else { \ | |
| 748 blitter(2, Uint8, ALPHA_BLIT16_555); \ | |
| 749 } \ | |
| 750 break; \ | |
| 751 } \ | |
| 752 /* fallthrough */ \ | |
| 753 \ | |
| 754 default: \ | |
| 755 general16: \ | |
| 756 blitter(2, Uint8, ALPHA_BLIT_ANY); \ | |
| 757 } \ | |
| 758 break; \ | |
| 759 \ | |
| 760 case 3: \ | |
| 761 blitter(3, Uint8, ALPHA_BLIT_ANY); \ | |
| 762 break; \ | |
| 763 \ | |
| 764 case 4: \ | |
| 765 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ | |
| 766 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ | |
| 767 || fmt->Bmask == 0xff00)) { \ | |
| 768 if(alpha == 128) \ | |
| 769 blitter(4, Uint16, ALPHA_BLIT32_888_50); \ | |
| 770 else \ | |
| 771 blitter(4, Uint16, ALPHA_BLIT32_888); \ | |
| 772 } else \ | |
| 773 blitter(4, Uint16, ALPHA_BLIT_ANY); \ | |
| 774 break; \ | |
| 775 } \ | |
| 776 } \ | |
| 777 } while(0) | |
| 778 | |
|
689
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779 #endif |
| 0 | 780 |
| 781 /* | |
| 782 * This takes care of the case when the surface is clipped on the left and/or | |
| 783 * right. Top clipping has already been taken care of. | |
| 784 */ | |
| 785 static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 786 Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha) | |
| 787 { | |
| 788 SDL_PixelFormat *fmt = dst->format; | |
| 789 | |
| 790 #define RLECLIPBLIT(bpp, Type, do_blit) \ | |
| 791 do { \ | |
| 792 int linecount = srcrect->h; \ | |
| 793 int ofs = 0; \ | |
| 794 int left = srcrect->x; \ | |
| 795 int right = left + srcrect->w; \ | |
| 796 dstbuf -= left * bpp; \ | |
| 797 for(;;) { \ | |
| 798 int run; \ | |
| 799 ofs += *(Type *)srcbuf; \ | |
| 800 run = ((Type *)srcbuf)[1]; \ | |
| 801 srcbuf += 2 * sizeof(Type); \ | |
| 802 if(run) { \ | |
| 803 /* clip to left and right borders */ \ | |
| 804 if(ofs < right) { \ | |
| 805 int start = 0; \ | |
| 806 int len = run; \ | |
| 807 int startcol; \ | |
| 808 if(left - ofs > 0) { \ | |
| 809 start = left - ofs; \ | |
| 810 len -= start; \ | |
| 811 if(len <= 0) \ | |
| 812 goto nocopy ## bpp ## do_blit; \ | |
| 813 } \ | |
| 814 startcol = ofs + start; \ | |
| 815 if(len > right - startcol) \ | |
| 816 len = right - startcol; \ | |
| 817 do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \ | |
| 818 len, bpp, alpha); \ | |
| 819 } \ | |
| 820 nocopy ## bpp ## do_blit: \ | |
| 821 srcbuf += run * bpp; \ | |
| 822 ofs += run; \ | |
| 823 } else if(!ofs) \ | |
| 824 break; \ | |
| 825 if(ofs == w) { \ | |
| 826 ofs = 0; \ | |
| 827 dstbuf += dst->pitch; \ | |
| 828 if(!--linecount) \ | |
| 829 break; \ | |
| 830 } \ | |
| 831 } \ | |
| 832 } while(0) | |
| 833 | |
| 834 CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); | |
| 835 | |
| 836 #undef RLECLIPBLIT | |
| 837 | |
| 838 } | |
| 839 | |
| 840 | |
| 841 /* blit a colorkeyed RLE surface */ | |
| 842 int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 843 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 844 { | |
| 845 Uint8 *dstbuf; | |
| 846 Uint8 *srcbuf; | |
| 847 int x, y; | |
| 848 int w = src->w; | |
| 849 unsigned alpha; | |
| 850 | |
| 851 /* Lock the destination if necessary */ | |
|
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852 if ( SDL_MUSTLOCK(dst) ) { |
|
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|
853 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 854 return(-1); |
| 855 } | |
| 856 } | |
| 857 | |
| 858 /* Set up the source and destination pointers */ | |
| 859 x = dstrect->x; | |
| 860 y = dstrect->y; | |
|
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861 dstbuf = (Uint8 *)dst->pixels |
| 0 | 862 + y * dst->pitch + x * src->format->BytesPerPixel; |
| 863 srcbuf = (Uint8 *)src->map->sw_data->aux_data; | |
| 864 | |
| 865 { | |
| 866 /* skip lines at the top if neccessary */ | |
| 867 int vskip = srcrect->y; | |
| 868 int ofs = 0; | |
| 869 if(vskip) { | |
| 870 | |
| 871 #define RLESKIP(bpp, Type) \ | |
| 872 for(;;) { \ | |
| 873 int run; \ | |
| 874 ofs += *(Type *)srcbuf; \ | |
| 875 run = ((Type *)srcbuf)[1]; \ | |
| 876 srcbuf += sizeof(Type) * 2; \ | |
| 877 if(run) { \ | |
| 878 srcbuf += run * bpp; \ | |
| 879 ofs += run; \ | |
| 880 } else if(!ofs) \ | |
| 881 goto done; \ | |
| 882 if(ofs == w) { \ | |
| 883 ofs = 0; \ | |
| 884 if(!--vskip) \ | |
| 885 break; \ | |
| 886 } \ | |
| 887 } | |
| 888 | |
| 889 switch(src->format->BytesPerPixel) { | |
| 890 case 1: RLESKIP(1, Uint8); break; | |
| 891 case 2: RLESKIP(2, Uint8); break; | |
| 892 case 3: RLESKIP(3, Uint8); break; | |
| 893 case 4: RLESKIP(4, Uint16); break; | |
| 894 } | |
| 895 | |
| 896 #undef RLESKIP | |
| 897 | |
| 898 } | |
| 899 } | |
| 900 | |
| 901 alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 902 ? src->format->alpha : 255; | |
| 903 /* if left or right edge clipping needed, call clip blit */ | |
| 904 if ( srcrect->x || srcrect->w != src->w ) { | |
| 905 RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); | |
| 906 } else { | |
| 907 SDL_PixelFormat *fmt = src->format; | |
| 908 | |
| 909 #define RLEBLIT(bpp, Type, do_blit) \ | |
| 910 do { \ | |
| 911 int linecount = srcrect->h; \ | |
| 912 int ofs = 0; \ | |
| 913 for(;;) { \ | |
| 914 unsigned run; \ | |
| 915 ofs += *(Type *)srcbuf; \ | |
| 916 run = ((Type *)srcbuf)[1]; \ | |
| 917 srcbuf += 2 * sizeof(Type); \ | |
| 918 if(run) { \ | |
| 919 do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \ | |
| 920 srcbuf += run * bpp; \ | |
| 921 ofs += run; \ | |
| 922 } else if(!ofs) \ | |
| 923 break; \ | |
| 924 if(ofs == w) { \ | |
| 925 ofs = 0; \ | |
| 926 dstbuf += dst->pitch; \ | |
| 927 if(!--linecount) \ | |
| 928 break; \ | |
| 929 } \ | |
| 930 } \ | |
| 931 } while(0) | |
| 932 | |
| 933 CHOOSE_BLIT(RLEBLIT, alpha, fmt); | |
| 934 | |
| 935 #undef RLEBLIT | |
| 936 } | |
| 937 | |
| 938 done: | |
| 939 /* Unlock the destination if necessary */ | |
|
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|
940 if ( SDL_MUSTLOCK(dst) ) { |
|
4314a501d7be
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|
941 SDL_UnlockSurface(dst); |
| 0 | 942 } |
| 943 return(0); | |
| 944 } | |
| 945 | |
| 946 #undef OPAQUE_BLIT | |
| 947 | |
| 948 /* | |
| 949 * Per-pixel blitting macros for translucent pixels: | |
| 950 * These use the same techniques as the per-surface blitting macros | |
| 951 */ | |
| 952 | |
| 953 /* | |
| 954 * For 32bpp pixels, we have made sure the alpha is stored in the top | |
| 955 * 8 bits, so proceed as usual | |
| 956 */ | |
| 957 #define BLIT_TRANSL_888(src, dst) \ | |
| 958 do { \ | |
| 959 Uint32 s = src; \ | |
| 960 Uint32 d = dst; \ | |
| 961 unsigned alpha = s >> 24; \ | |
| 962 Uint32 s1 = s & 0xff00ff; \ | |
| 963 Uint32 d1 = d & 0xff00ff; \ | |
| 964 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 965 s &= 0xff00; \ | |
| 966 d &= 0xff00; \ | |
| 967 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 968 dst = d1 | d; \ | |
| 969 } while(0) | |
| 970 | |
| 971 /* | |
| 972 * For 16bpp pixels, we have stored the 5 most significant alpha bits in | |
| 973 * bits 5-10. As before, we can process all 3 RGB components at the same time. | |
| 974 */ | |
| 975 #define BLIT_TRANSL_565(src, dst) \ | |
| 976 do { \ | |
| 977 Uint32 s = src; \ | |
| 978 Uint32 d = dst; \ | |
| 979 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 980 s &= 0x07e0f81f; \ | |
| 981 d = (d | d << 16) & 0x07e0f81f; \ | |
| 982 d += (s - d) * alpha >> 5; \ | |
| 983 d &= 0x07e0f81f; \ | |
| 984 dst = d | d >> 16; \ | |
| 985 } while(0) | |
| 986 | |
| 987 #define BLIT_TRANSL_555(src, dst) \ | |
| 988 do { \ | |
| 989 Uint32 s = src; \ | |
| 990 Uint32 d = dst; \ | |
| 991 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 992 s &= 0x03e07c1f; \ | |
| 993 d = (d | d << 16) & 0x03e07c1f; \ | |
| 994 d += (s - d) * alpha >> 5; \ | |
| 995 d &= 0x03e07c1f; \ | |
| 996 dst = d | d >> 16; \ | |
| 997 } while(0) | |
| 998 | |
| 999 /* used to save the destination format in the encoding. Designed to be | |
| 1000 macro-compatible with SDL_PixelFormat but without the unneeded fields */ | |
| 1001 typedef struct { | |
| 1002 Uint8 BytesPerPixel; | |
| 1003 Uint8 Rloss; | |
| 1004 Uint8 Gloss; | |
| 1005 Uint8 Bloss; | |
| 1006 Uint8 Rshift; | |
| 1007 Uint8 Gshift; | |
| 1008 Uint8 Bshift; | |
| 1009 Uint8 Ashift; | |
| 1010 Uint32 Rmask; | |
| 1011 Uint32 Gmask; | |
| 1012 Uint32 Bmask; | |
| 1013 Uint32 Amask; | |
| 1014 } RLEDestFormat; | |
| 1015 | |
| 1016 /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ | |
| 1017 static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 1018 Uint8 *dstbuf, SDL_Rect *srcrect) | |
| 1019 { | |
| 1020 SDL_PixelFormat *df = dst->format; | |
| 1021 /* | |
| 1022 * clipped blitter: Ptype is the destination pixel type, | |
| 1023 * Ctype the translucent count type, and do_blend the macro | |
| 1024 * to blend one pixel. | |
| 1025 */ | |
| 1026 #define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \ | |
| 1027 do { \ | |
| 1028 int linecount = srcrect->h; \ | |
| 1029 int left = srcrect->x; \ | |
| 1030 int right = left + srcrect->w; \ | |
| 1031 dstbuf -= left * sizeof(Ptype); \ | |
| 1032 do { \ | |
| 1033 int ofs = 0; \ | |
| 1034 /* blit opaque pixels on one line */ \ | |
| 1035 do { \ | |
| 1036 unsigned run; \ | |
| 1037 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1038 run = ((Ctype *)srcbuf)[1]; \ | |
| 1039 srcbuf += 2 * sizeof(Ctype); \ | |
| 1040 if(run) { \ | |
| 1041 /* clip to left and right borders */ \ | |
| 1042 int cofs = ofs; \ | |
| 1043 int crun = run; \ | |
| 1044 if(left - cofs > 0) { \ | |
| 1045 crun -= left - cofs; \ | |
| 1046 cofs = left; \ | |
| 1047 } \ | |
| 1048 if(crun > right - cofs) \ | |
| 1049 crun = right - cofs; \ | |
| 1050 if(crun > 0) \ | |
|
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1051 PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \ |
| 0 | 1052 srcbuf + (cofs - ofs) * sizeof(Ptype), \ |
|
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|
1053 (unsigned)crun, sizeof(Ptype)); \ |
| 0 | 1054 srcbuf += run * sizeof(Ptype); \ |
| 1055 ofs += run; \ | |
| 1056 } else if(!ofs) \ | |
| 1057 return; \ | |
| 1058 } while(ofs < w); \ | |
| 1059 /* skip padding if necessary */ \ | |
| 1060 if(sizeof(Ptype) == 2) \ | |
| 1061 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1062 /* blit translucent pixels on the same line */ \ | |
| 1063 ofs = 0; \ | |
| 1064 do { \ | |
| 1065 unsigned run; \ | |
| 1066 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1067 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1068 srcbuf += 4; \ | |
| 1069 if(run) { \ | |
| 1070 /* clip to left and right borders */ \ | |
| 1071 int cofs = ofs; \ | |
| 1072 int crun = run; \ | |
| 1073 if(left - cofs > 0) { \ | |
| 1074 crun -= left - cofs; \ | |
| 1075 cofs = left; \ | |
| 1076 } \ | |
| 1077 if(crun > right - cofs) \ | |
| 1078 crun = right - cofs; \ | |
| 1079 if(crun > 0) { \ | |
| 1080 Ptype *dst = (Ptype *)dstbuf + cofs; \ | |
| 1081 Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \ | |
| 1082 int i; \ | |
| 1083 for(i = 0; i < crun; i++) \ | |
| 1084 do_blend(src[i], dst[i]); \ | |
| 1085 } \ | |
| 1086 srcbuf += run * 4; \ | |
| 1087 ofs += run; \ | |
| 1088 } \ | |
| 1089 } while(ofs < w); \ | |
| 1090 dstbuf += dst->pitch; \ | |
| 1091 } while(--linecount); \ | |
| 1092 } while(0) | |
| 1093 | |
| 1094 switch(df->BytesPerPixel) { | |
| 1095 case 2: | |
| 1096 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1097 || df->Bmask == 0x07e0) | |
| 1098 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1099 else | |
| 1100 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1101 break; | |
| 1102 case 4: | |
| 1103 RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1104 break; | |
| 1105 } | |
| 1106 } | |
| 1107 | |
| 1108 /* blit a pixel-alpha RLE surface */ | |
| 1109 int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 1110 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 1111 { | |
| 1112 int x, y; | |
| 1113 int w = src->w; | |
| 1114 Uint8 *srcbuf, *dstbuf; | |
| 1115 SDL_PixelFormat *df = dst->format; | |
| 1116 | |
| 1117 /* Lock the destination if necessary */ | |
|
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1118 if ( SDL_MUSTLOCK(dst) ) { |
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|
1119 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 1120 return -1; |
| 1121 } | |
| 1122 } | |
| 1123 | |
| 1124 x = dstrect->x; | |
| 1125 y = dstrect->y; | |
|
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1126 dstbuf = (Uint8 *)dst->pixels |
| 0 | 1127 + y * dst->pitch + x * df->BytesPerPixel; |
| 1128 srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat); | |
| 1129 | |
| 1130 { | |
| 1131 /* skip lines at the top if necessary */ | |
| 1132 int vskip = srcrect->y; | |
| 1133 if(vskip) { | |
| 1134 int ofs; | |
| 1135 if(df->BytesPerPixel == 2) { | |
| 1136 /* the 16/32 interleaved format */ | |
| 1137 do { | |
| 1138 /* skip opaque line */ | |
| 1139 ofs = 0; | |
| 1140 do { | |
| 1141 int run; | |
| 1142 ofs += srcbuf[0]; | |
| 1143 run = srcbuf[1]; | |
| 1144 srcbuf += 2; | |
| 1145 if(run) { | |
| 1146 srcbuf += 2 * run; | |
| 1147 ofs += run; | |
| 1148 } else if(!ofs) | |
| 1149 goto done; | |
| 1150 } while(ofs < w); | |
| 1151 | |
| 1152 /* skip padding */ | |
| 1153 srcbuf += (unsigned long)srcbuf & 2; | |
| 1154 | |
| 1155 /* skip translucent line */ | |
| 1156 ofs = 0; | |
| 1157 do { | |
| 1158 int run; | |
| 1159 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1160 run = ((Uint16 *)srcbuf)[1]; | |
| 1161 srcbuf += 4 * (run + 1); | |
| 1162 ofs += run; | |
| 1163 } while(ofs < w); | |
| 1164 } while(--vskip); | |
| 1165 } else { | |
| 1166 /* the 32/32 interleaved format */ | |
| 1167 vskip <<= 1; /* opaque and translucent have same format */ | |
| 1168 do { | |
| 1169 ofs = 0; | |
| 1170 do { | |
| 1171 int run; | |
| 1172 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1173 run = ((Uint16 *)srcbuf)[1]; | |
| 1174 srcbuf += 4; | |
| 1175 if(run) { | |
| 1176 srcbuf += 4 * run; | |
| 1177 ofs += run; | |
| 1178 } else if(!ofs) | |
| 1179 goto done; | |
| 1180 } while(ofs < w); | |
| 1181 } while(--vskip); | |
| 1182 } | |
| 1183 } | |
| 1184 } | |
| 1185 | |
| 1186 /* if left or right edge clipping needed, call clip blit */ | |
| 1187 if(srcrect->x || srcrect->w != src->w) { | |
| 1188 RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect); | |
| 1189 } else { | |
| 1190 | |
| 1191 /* | |
| 1192 * non-clipped blitter. Ptype is the destination pixel type, | |
| 1193 * Ctype the translucent count type, and do_blend the | |
| 1194 * macro to blend one pixel. | |
| 1195 */ | |
| 1196 #define RLEALPHABLIT(Ptype, Ctype, do_blend) \ | |
| 1197 do { \ | |
| 1198 int linecount = srcrect->h; \ | |
| 1199 do { \ | |
| 1200 int ofs = 0; \ | |
| 1201 /* blit opaque pixels on one line */ \ | |
| 1202 do { \ | |
| 1203 unsigned run; \ | |
| 1204 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1205 run = ((Ctype *)srcbuf)[1]; \ | |
| 1206 srcbuf += 2 * sizeof(Ctype); \ | |
| 1207 if(run) { \ | |
|
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|
1208 PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \ |
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|
1209 run, sizeof(Ptype)); \ |
| 0 | 1210 srcbuf += run * sizeof(Ptype); \ |
| 1211 ofs += run; \ | |
| 1212 } else if(!ofs) \ | |
| 1213 goto done; \ | |
| 1214 } while(ofs < w); \ | |
| 1215 /* skip padding if necessary */ \ | |
| 1216 if(sizeof(Ptype) == 2) \ | |
| 1217 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1218 /* blit translucent pixels on the same line */ \ | |
| 1219 ofs = 0; \ | |
| 1220 do { \ | |
| 1221 unsigned run; \ | |
| 1222 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1223 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1224 srcbuf += 4; \ | |
| 1225 if(run) { \ | |
| 1226 Ptype *dst = (Ptype *)dstbuf + ofs; \ | |
| 1227 unsigned i; \ | |
| 1228 for(i = 0; i < run; i++) { \ | |
| 1229 Uint32 src = *(Uint32 *)srcbuf; \ | |
| 1230 do_blend(src, *dst); \ | |
| 1231 srcbuf += 4; \ | |
| 1232 dst++; \ | |
| 1233 } \ | |
| 1234 ofs += run; \ | |
| 1235 } \ | |
| 1236 } while(ofs < w); \ | |
| 1237 dstbuf += dst->pitch; \ | |
| 1238 } while(--linecount); \ | |
| 1239 } while(0) | |
| 1240 | |
| 1241 switch(df->BytesPerPixel) { | |
| 1242 case 2: | |
| 1243 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1244 || df->Bmask == 0x07e0) | |
| 1245 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1246 else | |
| 1247 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1248 break; | |
| 1249 case 4: | |
| 1250 RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1251 break; | |
| 1252 } | |
| 1253 } | |
| 1254 | |
| 1255 done: | |
| 1256 /* Unlock the destination if necessary */ | |
|
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|
1257 if ( SDL_MUSTLOCK(dst) ) { |
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|
1258 SDL_UnlockSurface(dst); |
| 0 | 1259 } |
| 1260 return 0; | |
| 1261 } | |
| 1262 | |
| 1263 /* | |
| 1264 * Auxiliary functions: | |
| 1265 * The encoding functions take 32bpp rgb + a, and | |
| 1266 * return the number of bytes copied to the destination. | |
| 1267 * The decoding functions copy to 32bpp rgb + a, and | |
| 1268 * return the number of bytes copied from the source. | |
| 1269 * These are only used in the encoder and un-RLE code and are therefore not | |
| 1270 * highly optimised. | |
| 1271 */ | |
| 1272 | |
| 1273 /* encode 32bpp rgb + a into 16bpp rgb, losing alpha */ | |
| 1274 static int copy_opaque_16(void *dst, Uint32 *src, int n, | |
| 1275 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1276 { | |
| 1277 int i; | |
| 1278 Uint16 *d = dst; | |
| 1279 for(i = 0; i < n; i++) { | |
| 1280 unsigned r, g, b; | |
| 1281 RGB_FROM_PIXEL(*src, sfmt, r, g, b); | |
| 1282 PIXEL_FROM_RGB(*d, dfmt, r, g, b); | |
| 1283 src++; | |
| 1284 d++; | |
| 1285 } | |
| 1286 return n * 2; | |
| 1287 } | |
| 1288 | |
| 1289 /* decode opaque pixels from 16bpp to 32bpp rgb + a */ | |
| 1290 static int uncopy_opaque_16(Uint32 *dst, void *src, int n, | |
| 1291 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1292 { | |
| 1293 int i; | |
| 1294 Uint16 *s = src; | |
| 1295 unsigned alpha = dfmt->Amask ? 255 : 0; | |
| 1296 for(i = 0; i < n; i++) { | |
| 1297 unsigned r, g, b; | |
| 1298 RGB_FROM_PIXEL(*s, sfmt, r, g, b); | |
| 1299 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha); | |
| 1300 s++; | |
| 1301 dst++; | |
| 1302 } | |
| 1303 return n * 2; | |
| 1304 } | |
| 1305 | |
| 1306 | |
| 1307 | |
| 1308 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */ | |
| 1309 static int copy_transl_565(void *dst, Uint32 *src, int n, | |
| 1310 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1311 { | |
| 1312 int i; | |
| 1313 Uint32 *d = dst; | |
| 1314 for(i = 0; i < n; i++) { | |
| 1315 unsigned r, g, b, a; | |
| 1316 Uint16 pix; | |
| 1317 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1318 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1319 *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0); | |
| 1320 src++; | |
| 1321 d++; | |
| 1322 } | |
| 1323 return n * 4; | |
| 1324 } | |
| 1325 | |
| 1326 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */ | |
| 1327 static int copy_transl_555(void *dst, Uint32 *src, int n, | |
| 1328 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1329 { | |
| 1330 int i; | |
| 1331 Uint32 *d = dst; | |
| 1332 for(i = 0; i < n; i++) { | |
| 1333 unsigned r, g, b, a; | |
| 1334 Uint16 pix; | |
| 1335 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1336 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1337 *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0); | |
| 1338 src++; | |
| 1339 d++; | |
| 1340 } | |
| 1341 return n * 4; | |
| 1342 } | |
| 1343 | |
| 1344 /* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */ | |
| 1345 static int uncopy_transl_16(Uint32 *dst, void *src, int n, | |
| 1346 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1347 { | |
| 1348 int i; | |
| 1349 Uint32 *s = src; | |
| 1350 for(i = 0; i < n; i++) { | |
| 1351 unsigned r, g, b, a; | |
| 1352 Uint32 pix = *s++; | |
| 1353 a = (pix & 0x3e0) >> 2; | |
| 1354 pix = (pix & ~0x3e0) | pix >> 16; | |
| 1355 RGB_FROM_PIXEL(pix, sfmt, r, g, b); | |
| 1356 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1357 dst++; | |
| 1358 } | |
| 1359 return n * 4; | |
| 1360 } | |
| 1361 | |
| 1362 /* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1363 static int copy_32(void *dst, Uint32 *src, int n, | |
| 1364 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1365 { | |
| 1366 int i; | |
| 1367 Uint32 *d = dst; | |
| 1368 for(i = 0; i < n; i++) { | |
| 1369 unsigned r, g, b, a; | |
| 1370 Uint32 pixel; | |
| 1371 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1372 PIXEL_FROM_RGB(pixel, dfmt, r, g, b); | |
| 1373 *d++ = pixel | a << 24; | |
| 1374 src++; | |
| 1375 } | |
| 1376 return n * 4; | |
| 1377 } | |
| 1378 | |
| 1379 /* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1380 static int uncopy_32(Uint32 *dst, void *src, int n, | |
| 1381 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1382 { | |
| 1383 int i; | |
| 1384 Uint32 *s = src; | |
| 1385 for(i = 0; i < n; i++) { | |
| 1386 unsigned r, g, b, a; | |
| 1387 Uint32 pixel = *s++; | |
| 1388 RGB_FROM_PIXEL(pixel, sfmt, r, g, b); | |
| 1389 a = pixel >> 24; | |
| 1390 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1391 dst++; | |
| 1392 } | |
| 1393 return n * 4; | |
| 1394 } | |
| 1395 | |
| 1396 #define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255) | |
| 1397 | |
| 1398 #define ISTRANSL(pixel, fmt) \ | |
| 1399 ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U) | |
| 1400 | |
| 1401 /* convert surface to be quickly alpha-blittable onto dest, if possible */ | |
| 1402 static int RLEAlphaSurface(SDL_Surface *surface) | |
| 1403 { | |
| 1404 SDL_Surface *dest; | |
| 1405 SDL_PixelFormat *df; | |
| 1406 int maxsize = 0; | |
| 1407 int max_opaque_run; | |
| 1408 int max_transl_run = 65535; | |
| 1409 unsigned masksum; | |
| 1410 Uint8 *rlebuf, *dst; | |
| 1411 int (*copy_opaque)(void *, Uint32 *, int, | |
| 1412 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1413 int (*copy_transl)(void *, Uint32 *, int, | |
| 1414 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1415 | |
| 1416 dest = surface->map->dst; | |
| 1417 if(!dest) | |
| 1418 return -1; | |
| 1419 df = dest->format; | |
| 1420 if(surface->format->BitsPerPixel != 32) | |
| 1421 return -1; /* only 32bpp source supported */ | |
| 1422 | |
| 1423 /* find out whether the destination is one we support, | |
| 1424 and determine the max size of the encoded result */ | |
| 1425 masksum = df->Rmask | df->Gmask | df->Bmask; | |
| 1426 switch(df->BytesPerPixel) { | |
| 1427 case 2: | |
| 1428 /* 16bpp: only support 565 and 555 formats */ | |
| 1429 switch(masksum) { | |
| 1430 case 0xffff: | |
| 1431 if(df->Gmask == 0x07e0 | |
| 1432 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) { | |
| 1433 copy_opaque = copy_opaque_16; | |
| 1434 copy_transl = copy_transl_565; | |
| 1435 } else | |
| 1436 return -1; | |
| 1437 break; | |
| 1438 case 0x7fff: | |
| 1439 if(df->Gmask == 0x03e0 | |
| 1440 || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) { | |
| 1441 copy_opaque = copy_opaque_16; | |
| 1442 copy_transl = copy_transl_555; | |
| 1443 } else | |
| 1444 return -1; | |
| 1445 break; | |
| 1446 default: | |
| 1447 return -1; | |
| 1448 } | |
| 1449 max_opaque_run = 255; /* runs stored as bytes */ | |
| 1450 | |
| 1451 /* worst case is alternating opaque and translucent pixels, | |
| 1452 with room for alignment padding between lines */ | |
| 1453 maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2; | |
| 1454 break; | |
| 1455 case 4: | |
| 1456 if(masksum != 0x00ffffff) | |
| 1457 return -1; /* requires unused high byte */ | |
| 1458 copy_opaque = copy_32; | |
| 1459 copy_transl = copy_32; | |
| 1460 max_opaque_run = 255; /* runs stored as short ints */ | |
| 1461 | |
| 1462 /* worst case is alternating opaque and translucent pixels */ | |
| 1463 maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4; | |
| 1464 break; | |
| 1465 default: | |
| 1466 return -1; /* anything else unsupported right now */ | |
| 1467 } | |
| 1468 | |
| 1469 maxsize += sizeof(RLEDestFormat); | |
|
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|
1470 rlebuf = (Uint8 *)SDL_malloc(maxsize); |
| 0 | 1471 if(!rlebuf) { |
| 1472 SDL_OutOfMemory(); | |
| 1473 return -1; | |
| 1474 } | |
| 1475 { | |
| 1476 /* save the destination format so we can undo the encoding later */ | |
| 1477 RLEDestFormat *r = (RLEDestFormat *)rlebuf; | |
| 1478 r->BytesPerPixel = df->BytesPerPixel; | |
| 1479 r->Rloss = df->Rloss; | |
| 1480 r->Gloss = df->Gloss; | |
| 1481 r->Bloss = df->Bloss; | |
| 1482 r->Rshift = df->Rshift; | |
| 1483 r->Gshift = df->Gshift; | |
| 1484 r->Bshift = df->Bshift; | |
| 1485 r->Ashift = df->Ashift; | |
| 1486 r->Rmask = df->Rmask; | |
| 1487 r->Gmask = df->Gmask; | |
| 1488 r->Bmask = df->Bmask; | |
| 1489 r->Amask = df->Amask; | |
| 1490 } | |
| 1491 dst = rlebuf + sizeof(RLEDestFormat); | |
| 1492 | |
| 1493 /* Do the actual encoding */ | |
| 1494 { | |
| 1495 int x, y; | |
| 1496 int h = surface->h, w = surface->w; | |
| 1497 SDL_PixelFormat *sf = surface->format; | |
|
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1498 Uint32 *src = (Uint32 *)surface->pixels; |
| 0 | 1499 Uint8 *lastline = dst; /* end of last non-blank line */ |
| 1500 | |
| 1501 /* opaque counts are 8 or 16 bits, depending on target depth */ | |
| 1502 #define ADD_OPAQUE_COUNTS(n, m) \ | |
| 1503 if(df->BytesPerPixel == 4) { \ | |
| 1504 ((Uint16 *)dst)[0] = n; \ | |
| 1505 ((Uint16 *)dst)[1] = m; \ | |
| 1506 dst += 4; \ | |
| 1507 } else { \ | |
| 1508 dst[0] = n; \ | |
| 1509 dst[1] = m; \ | |
| 1510 dst += 2; \ | |
| 1511 } | |
| 1512 | |
| 1513 /* translucent counts are always 16 bit */ | |
| 1514 #define ADD_TRANSL_COUNTS(n, m) \ | |
| 1515 (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4) | |
| 1516 | |
| 1517 for(y = 0; y < h; y++) { | |
| 1518 int runstart, skipstart; | |
| 1519 int blankline = 0; | |
| 1520 /* First encode all opaque pixels of a scan line */ | |
| 1521 x = 0; | |
| 1522 do { | |
| 1523 int run, skip, len; | |
| 1524 skipstart = x; | |
| 1525 while(x < w && !ISOPAQUE(src[x], sf)) | |
| 1526 x++; | |
| 1527 runstart = x; | |
| 1528 while(x < w && ISOPAQUE(src[x], sf)) | |
| 1529 x++; | |
| 1530 skip = runstart - skipstart; | |
| 1531 if(skip == w) | |
| 1532 blankline = 1; | |
| 1533 run = x - runstart; | |
| 1534 while(skip > max_opaque_run) { | |
| 1535 ADD_OPAQUE_COUNTS(max_opaque_run, 0); | |
| 1536 skip -= max_opaque_run; | |
| 1537 } | |
| 1538 len = MIN(run, max_opaque_run); | |
| 1539 ADD_OPAQUE_COUNTS(skip, len); | |
| 1540 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1541 runstart += len; | |
| 1542 run -= len; | |
| 1543 while(run) { | |
| 1544 len = MIN(run, max_opaque_run); | |
| 1545 ADD_OPAQUE_COUNTS(0, len); | |
| 1546 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1547 runstart += len; | |
| 1548 run -= len; | |
| 1549 } | |
| 1550 } while(x < w); | |
| 1551 | |
| 1552 /* Make sure the next output address is 32-bit aligned */ | |
| 1553 dst += (unsigned long)dst & 2; | |
| 1554 | |
| 1555 /* Next, encode all translucent pixels of the same scan line */ | |
| 1556 x = 0; | |
| 1557 do { | |
| 1558 int run, skip, len; | |
| 1559 skipstart = x; | |
| 1560 while(x < w && !ISTRANSL(src[x], sf)) | |
| 1561 x++; | |
| 1562 runstart = x; | |
| 1563 while(x < w && ISTRANSL(src[x], sf)) | |
| 1564 x++; | |
| 1565 skip = runstart - skipstart; | |
| 1566 blankline &= (skip == w); | |
| 1567 run = x - runstart; | |
| 1568 while(skip > max_transl_run) { | |
| 1569 ADD_TRANSL_COUNTS(max_transl_run, 0); | |
| 1570 skip -= max_transl_run; | |
| 1571 } | |
| 1572 len = MIN(run, max_transl_run); | |
| 1573 ADD_TRANSL_COUNTS(skip, len); | |
| 1574 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1575 runstart += len; | |
| 1576 run -= len; | |
| 1577 while(run) { | |
| 1578 len = MIN(run, max_transl_run); | |
| 1579 ADD_TRANSL_COUNTS(0, len); | |
| 1580 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1581 runstart += len; | |
| 1582 run -= len; | |
| 1583 } | |
| 1584 if(!blankline) | |
| 1585 lastline = dst; | |
| 1586 } while(x < w); | |
| 1587 | |
| 1588 src += surface->pitch >> 2; | |
| 1589 } | |
| 1590 dst = lastline; /* back up past trailing blank lines */ | |
| 1591 ADD_OPAQUE_COUNTS(0, 0); | |
| 1592 } | |
| 1593 | |
| 1594 #undef ADD_OPAQUE_COUNTS | |
| 1595 #undef ADD_TRANSL_COUNTS | |
| 1596 | |
| 1597 /* Now that we have it encoded, release the original pixels */ | |
| 1598 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1599 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
|
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1600 SDL_free( surface->pixels ); |
| 0 | 1601 surface->pixels = NULL; |
| 1602 } | |
| 1603 | |
| 1604 /* realloc the buffer to release unused memory */ | |
| 1605 { | |
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1606 Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf); |
| 0 | 1607 if(!p) |
| 1608 p = rlebuf; | |
| 1609 surface->map->sw_data->aux_data = p; | |
| 1610 } | |
| 1611 | |
| 1612 return 0; | |
| 1613 } | |
| 1614 | |
| 1615 static Uint32 getpix_8(Uint8 *srcbuf) | |
| 1616 { | |
| 1617 return *srcbuf; | |
| 1618 } | |
| 1619 | |
| 1620 static Uint32 getpix_16(Uint8 *srcbuf) | |
| 1621 { | |
| 1622 return *(Uint16 *)srcbuf; | |
| 1623 } | |
| 1624 | |
| 1625 static Uint32 getpix_24(Uint8 *srcbuf) | |
| 1626 { | |
|
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Fixed some compiler warnings about "unreachable code" on Watcom C.
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|
1627 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
|
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|
1628 return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16); |
|
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1629 #else |
|
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|
1630 return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2]; |
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1631 #endif |
| 0 | 1632 } |
| 1633 | |
| 1634 static Uint32 getpix_32(Uint8 *srcbuf) | |
| 1635 { | |
| 1636 return *(Uint32 *)srcbuf; | |
| 1637 } | |
| 1638 | |
| 1639 typedef Uint32 (*getpix_func)(Uint8 *); | |
| 1640 | |
| 1641 static getpix_func getpixes[4] = { | |
| 1642 getpix_8, getpix_16, getpix_24, getpix_32 | |
| 1643 }; | |
| 1644 | |
| 1645 static int RLEColorkeySurface(SDL_Surface *surface) | |
| 1646 { | |
| 1647 Uint8 *rlebuf, *dst; | |
| 1648 int maxn; | |
| 1649 int y; | |
| 1650 Uint8 *srcbuf, *curbuf, *lastline; | |
| 1651 int maxsize = 0; | |
| 1652 int skip, run; | |
| 1653 int bpp = surface->format->BytesPerPixel; | |
| 1654 getpix_func getpix; | |
| 1655 Uint32 ckey, rgbmask; | |
| 1656 int w, h; | |
| 1657 | |
| 1658 /* calculate the worst case size for the compressed surface */ | |
| 1659 switch(bpp) { | |
| 1660 case 1: | |
| 1661 /* worst case is alternating opaque and transparent pixels, | |
| 1662 starting with an opaque pixel */ | |
| 1663 maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2; | |
| 1664 break; | |
| 1665 case 2: | |
| 1666 case 3: | |
| 1667 /* worst case is solid runs, at most 255 pixels wide */ | |
| 1668 maxsize = surface->h * (2 * (surface->w / 255 + 1) | |
| 1669 + surface->w * bpp) + 2; | |
| 1670 break; | |
| 1671 case 4: | |
| 1672 /* worst case is solid runs, at most 65535 pixels wide */ | |
| 1673 maxsize = surface->h * (4 * (surface->w / 65535 + 1) | |
| 1674 + surface->w * 4) + 4; | |
| 1675 break; | |
| 1676 } | |
| 1677 | |
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1678 rlebuf = (Uint8 *)SDL_malloc(maxsize); |
| 0 | 1679 if ( rlebuf == NULL ) { |
| 1680 SDL_OutOfMemory(); | |
| 1681 return(-1); | |
| 1682 } | |
| 1683 | |
| 1684 /* Set up the conversion */ | |
|
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changeset
|
1685 srcbuf = (Uint8 *)surface->pixels; |
| 0 | 1686 curbuf = srcbuf; |
| 1687 maxn = bpp == 4 ? 65535 : 255; | |
| 1688 skip = run = 0; | |
| 1689 dst = rlebuf; | |
| 1690 rgbmask = ~surface->format->Amask; | |
| 1691 ckey = surface->format->colorkey & rgbmask; | |
| 1692 lastline = dst; | |
| 1693 getpix = getpixes[bpp - 1]; | |
| 1694 w = surface->w; | |
| 1695 h = surface->h; | |
| 1696 | |
| 1697 #define ADD_COUNTS(n, m) \ | |
| 1698 if(bpp == 4) { \ | |
| 1699 ((Uint16 *)dst)[0] = n; \ | |
| 1700 ((Uint16 *)dst)[1] = m; \ | |
| 1701 dst += 4; \ | |
| 1702 } else { \ | |
| 1703 dst[0] = n; \ | |
| 1704 dst[1] = m; \ | |
| 1705 dst += 2; \ | |
| 1706 } | |
| 1707 | |
| 1708 for(y = 0; y < h; y++) { | |
| 1709 int x = 0; | |
| 1710 int blankline = 0; | |
| 1711 do { | |
| 1712 int run, skip, len; | |
| 1713 int runstart; | |
| 1714 int skipstart = x; | |
| 1715 | |
| 1716 /* find run of transparent, then opaque pixels */ | |
| 1717 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey) | |
| 1718 x++; | |
| 1719 runstart = x; | |
| 1720 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey) | |
| 1721 x++; | |
| 1722 skip = runstart - skipstart; | |
| 1723 if(skip == w) | |
| 1724 blankline = 1; | |
| 1725 run = x - runstart; | |
| 1726 | |
| 1727 /* encode segment */ | |
| 1728 while(skip > maxn) { | |
| 1729 ADD_COUNTS(maxn, 0); | |
| 1730 skip -= maxn; | |
| 1731 } | |
| 1732 len = MIN(run, maxn); | |
| 1733 ADD_COUNTS(skip, len); | |
|
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|
1734 SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp); |
| 0 | 1735 dst += len * bpp; |
| 1736 run -= len; | |
| 1737 runstart += len; | |
| 1738 while(run) { | |
| 1739 len = MIN(run, maxn); | |
| 1740 ADD_COUNTS(0, len); | |
|
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|
1741 SDL_memcpy(dst, srcbuf + runstart * bpp, len * bpp); |
| 0 | 1742 dst += len * bpp; |
| 1743 runstart += len; | |
| 1744 run -= len; | |
| 1745 } | |
| 1746 if(!blankline) | |
| 1747 lastline = dst; | |
| 1748 } while(x < w); | |
| 1749 | |
| 1750 srcbuf += surface->pitch; | |
| 1751 } | |
| 1752 dst = lastline; /* back up bast trailing blank lines */ | |
| 1753 ADD_COUNTS(0, 0); | |
| 1754 | |
| 1755 #undef ADD_COUNTS | |
| 1756 | |
| 1757 /* Now that we have it encoded, release the original pixels */ | |
| 1758 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1759 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
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|
1760 SDL_free( surface->pixels ); |
| 0 | 1761 surface->pixels = NULL; |
| 1762 } | |
| 1763 | |
| 1764 /* realloc the buffer to release unused memory */ | |
| 1765 { | |
| 1766 /* If realloc returns NULL, the original block is left intact */ | |
|
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|
1767 Uint8 *p = SDL_realloc(rlebuf, dst - rlebuf); |
| 0 | 1768 if(!p) |
| 1769 p = rlebuf; | |
| 1770 surface->map->sw_data->aux_data = p; | |
| 1771 } | |
| 1772 | |
| 1773 return(0); | |
| 1774 } | |
| 1775 | |
| 1776 int SDL_RLESurface(SDL_Surface *surface) | |
| 1777 { | |
| 1778 int retcode; | |
| 1779 | |
| 1780 /* Clear any previous RLE conversion */ | |
| 1781 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1782 SDL_UnRLESurface(surface, 1); | |
| 1783 } | |
| 1784 | |
| 1785 /* We don't support RLE encoding of bitmaps */ | |
| 1786 if ( surface->format->BitsPerPixel < 8 ) { | |
| 1787 return(-1); | |
| 1788 } | |
| 1789 | |
| 1790 /* 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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|
1791 if ( SDL_MUSTLOCK(surface) ) { |
|
4314a501d7be
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1792 if ( SDL_LockSurface(surface) < 0 ) { |
| 0 | 1793 return(-1); |
| 1794 } | |
| 1795 } | |
| 1796 | |
| 1797 /* Encode */ | |
| 1798 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1799 retcode = RLEColorkeySurface(surface); | |
| 1800 } else { | |
| 1801 if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 1802 && surface->format->Amask != 0) | |
| 1803 retcode = RLEAlphaSurface(surface); | |
| 1804 else | |
| 1805 retcode = -1; /* no RLE for per-surface alpha sans ckey */ | |
| 1806 } | |
| 1807 | |
| 1808 /* Unlock the surface if it's in hardware */ | |
|
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parents:
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|
1809 if ( SDL_MUSTLOCK(surface) ) { |
|
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|
1810 SDL_UnlockSurface(surface); |
| 0 | 1811 } |
| 1812 | |
| 1813 if(retcode < 0) | |
| 1814 return -1; | |
| 1815 | |
| 1816 /* The surface is now accelerated */ | |
| 1817 surface->flags |= SDL_RLEACCEL; | |
| 1818 | |
| 1819 return(0); | |
| 1820 } | |
| 1821 | |
| 1822 /* | |
| 1823 * Un-RLE a surface with pixel alpha | |
| 1824 * This may not give back exactly the image before RLE-encoding; all | |
| 1825 * completely transparent pixels will be lost, and colour and alpha depth | |
| 1826 * may have been reduced (when encoding for 16bpp targets). | |
| 1827 */ | |
|
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|
1828 static SDL_bool UnRLEAlpha(SDL_Surface *surface) |
| 0 | 1829 { |
| 1830 Uint8 *srcbuf; | |
| 1831 Uint32 *dst; | |
| 1832 SDL_PixelFormat *sf = surface->format; | |
| 1833 RLEDestFormat *df = surface->map->sw_data->aux_data; | |
| 1834 int (*uncopy_opaque)(Uint32 *, void *, int, | |
| 1835 RLEDestFormat *, SDL_PixelFormat *); | |
| 1836 int (*uncopy_transl)(Uint32 *, void *, int, | |
| 1837 RLEDestFormat *, SDL_PixelFormat *); | |
| 1838 int w = surface->w; | |
| 1839 int bpp = df->BytesPerPixel; | |
| 1840 | |
| 1841 if(bpp == 2) { | |
| 1842 uncopy_opaque = uncopy_opaque_16; | |
| 1843 uncopy_transl = uncopy_transl_16; | |
| 1844 } else { | |
| 1845 uncopy_opaque = uncopy_transl = uncopy_32; | |
| 1846 } | |
| 1847 | |
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1848 surface->pixels = SDL_malloc(surface->h * surface->pitch); |
|
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|
1849 if ( !surface->pixels ) { |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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diff
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|
1850 return(SDL_FALSE); |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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diff
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|
1851 } |
| 0 | 1852 /* fill background with transparent pixels */ |
|
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|
1853 SDL_memset(surface->pixels, 0, surface->h * surface->pitch); |
| 0 | 1854 |
| 1855 dst = surface->pixels; | |
| 1856 srcbuf = (Uint8 *)(df + 1); | |
| 1857 for(;;) { | |
| 1858 /* copy opaque pixels */ | |
| 1859 int ofs = 0; | |
| 1860 do { | |
| 1861 unsigned run; | |
| 1862 if(bpp == 2) { | |
| 1863 ofs += srcbuf[0]; | |
| 1864 run = srcbuf[1]; | |
| 1865 srcbuf += 2; | |
| 1866 } else { | |
| 1867 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1868 run = ((Uint16 *)srcbuf)[1]; | |
| 1869 srcbuf += 4; | |
| 1870 } | |
| 1871 if(run) { | |
| 1872 srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf); | |
| 1873 ofs += run; | |
| 1874 } else if(!ofs) | |
|
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1875 return(SDL_TRUE); |
| 0 | 1876 } while(ofs < w); |
| 1877 | |
| 1878 /* skip padding if needed */ | |
| 1879 if(bpp == 2) | |
| 1880 srcbuf += (unsigned long)srcbuf & 2; | |
| 1881 | |
| 1882 /* copy translucent pixels */ | |
| 1883 ofs = 0; | |
| 1884 do { | |
| 1885 unsigned run; | |
| 1886 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1887 run = ((Uint16 *)srcbuf)[1]; | |
| 1888 srcbuf += 4; | |
| 1889 if(run) { | |
| 1890 srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf); | |
| 1891 ofs += run; | |
| 1892 } | |
| 1893 } while(ofs < w); | |
| 1894 dst += surface->pitch >> 2; | |
| 1895 } | |
|
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|
1896 /* Make the compiler happy */ |
|
cdea7cbc3e23
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1897 return(SDL_TRUE); |
| 0 | 1898 } |
| 1899 | |
| 1900 void SDL_UnRLESurface(SDL_Surface *surface, int recode) | |
| 1901 { | |
| 1902 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1903 surface->flags &= ~SDL_RLEACCEL; | |
| 1904 | |
| 1905 if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1906 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1907 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1908 SDL_Rect full; | |
| 1909 unsigned alpha_flag; | |
| 1910 | |
| 1911 /* re-create the original surface */ | |
|
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1912 surface->pixels = SDL_malloc(surface->h * surface->pitch); |
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Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
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1913 if ( !surface->pixels ) { |
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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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1914 /* 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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1915 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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1916 return; |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1917 } |
| 0 | 1918 |
| 1919 /* fill it with the background colour */ | |
| 1920 SDL_FillRect(surface, NULL, surface->format->colorkey); | |
| 1921 | |
| 1922 /* now render the encoded surface */ | |
| 1923 full.x = full.y = 0; | |
| 1924 full.w = surface->w; | |
| 1925 full.h = surface->h; | |
| 1926 alpha_flag = surface->flags & SDL_SRCALPHA; | |
| 1927 surface->flags &= ~SDL_SRCALPHA; /* opaque blit */ | |
| 1928 SDL_RLEBlit(surface, &full, surface, &full); | |
| 1929 surface->flags |= alpha_flag; | |
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944
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
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1930 } else { |
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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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1931 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
|
1932 /* 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
|
1933 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
|
1934 return; |
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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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1935 } |
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cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
Sam Lantinga <slouken@libsdl.org>
parents:
880
diff
changeset
|
1936 } |
| 0 | 1937 } |
| 1938 | |
| 1939 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
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1940 SDL_free(surface->map->sw_data->aux_data); |
| 0 | 1941 surface->map->sw_data->aux_data = NULL; |
| 1942 } | |
| 1943 } | |
| 1944 } | |
| 1945 | |
| 1946 |