Mercurial > sdl-ios-xcode
annotate src/video/SDL_RLEaccel.c @ 1068:adb547913775
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| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Mon, 06 Jun 2005 10:26:40 +0000 |
| parents | cdea7cbc3e23 |
| children | 91569ec25acd |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* | |
| 29 * RLE encoding for software colorkey and alpha-channel acceleration | |
| 30 * | |
| 31 * Original version by Sam Lantinga | |
| 32 * | |
| 33 * Mattias Engdegård (Yorick): Rewrite. New encoding format, encoder and | |
| 34 * decoder. Added per-surface alpha blitter. Added per-pixel alpha | |
| 35 * format, encoder and blitter. | |
| 36 * | |
| 37 * Many thanks to Xark and johns for hints, benchmarks and useful comments | |
| 38 * leading to this code. | |
| 39 * | |
| 40 * Welcome to Macro Mayhem. | |
| 41 */ | |
| 42 | |
| 43 /* | |
| 44 * The encoding translates the image data to a stream of segments of the form | |
| 45 * | |
| 46 * <skip> <run> <data> | |
| 47 * | |
| 48 * where <skip> is the number of transparent pixels to skip, | |
| 49 * <run> is the number of opaque pixels to blit, | |
| 50 * and <data> are the pixels themselves. | |
| 51 * | |
| 52 * This basic structure is used both for colorkeyed surfaces, used for simple | |
| 53 * binary transparency and for per-surface alpha blending, and for surfaces | |
| 54 * with per-pixel alpha. The details differ, however: | |
| 55 * | |
| 56 * Encoding of colorkeyed surfaces: | |
| 57 * | |
| 58 * Encoded pixels always have the same format as the target surface. | |
| 59 * <skip> and <run> are unsigned 8 bit integers, except for 32 bit depth | |
| 60 * where they are 16 bit. This makes the pixel data aligned at all times. | |
| 61 * Segments never wrap around from one scan line to the next. | |
| 62 * | |
| 63 * The end of the sequence is marked by a zero <skip>,<run> pair at the * | |
| 64 * beginning of a line. | |
| 65 * | |
| 66 * Encoding of surfaces with per-pixel alpha: | |
| 67 * | |
| 68 * The sequence begins with a struct RLEDestFormat describing the target | |
| 69 * pixel format, to provide reliable un-encoding. | |
| 70 * | |
| 71 * Each scan line is encoded twice: First all completely opaque pixels, | |
| 72 * encoded in the target format as described above, and then all | |
| 73 * partially transparent (translucent) pixels (where 1 <= alpha <= 254), | |
| 74 * in the following 32-bit format: | |
| 75 * | |
| 76 * For 32-bit targets, each pixel has the target RGB format but with | |
| 77 * the alpha value occupying the highest 8 bits. The <skip> and <run> | |
| 78 * counts are 16 bit. | |
| 79 * | |
| 80 * For 16-bit targets, each pixel has the target RGB format, but with | |
| 81 * the middle component (usually green) shifted 16 steps to the left, | |
| 82 * and the hole filled with the 5 most significant bits of the alpha value. | |
| 83 * i.e. if the target has the format rrrrrggggggbbbbb, | |
| 84 * the encoded pixel will be 00000gggggg00000rrrrr0aaaaabbbbb. | |
| 85 * The <skip> and <run> counts are 8 bit for the opaque lines, 16 bit | |
| 86 * for the translucent lines. Two padding bytes may be inserted | |
| 87 * before each translucent line to keep them 32-bit aligned. | |
| 88 * | |
| 89 * The end of the sequence is marked by a zero <skip>,<run> pair at the | |
| 90 * beginning of an opaque line. | |
| 91 */ | |
| 92 | |
| 93 #include <stdio.h> | |
| 94 #include <stdlib.h> | |
| 95 #include <string.h> | |
| 96 | |
| 97 #include "SDL_types.h" | |
| 98 #include "SDL_video.h" | |
| 99 #include "SDL_error.h" | |
| 100 #include "SDL_sysvideo.h" | |
| 101 #include "SDL_blit.h" | |
| 102 #include "SDL_memops.h" | |
| 103 #include "SDL_RLEaccel_c.h" | |
| 104 | |
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105 #if (defined(i386) || defined(__x86_64__)) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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106 #define MMX_ASMBLIT |
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107 #endif |
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108 |
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109 #ifdef MMX_ASMBLIT |
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110 #include "mmx.h" |
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111 #include "SDL_cpuinfo.h" |
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112 #endif |
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113 |
| 0 | 114 #ifndef MAX |
| 115 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 116 #endif | |
| 117 #ifndef MIN | |
| 118 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 119 #endif | |
| 120 | |
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121 #define PIXEL_COPY(to, from, len, bpp) \ |
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122 do { \ |
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123 if(bpp == 4) { \ |
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124 SDL_memcpy4(to, from, (unsigned)(len)); \ |
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125 } else { \ |
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126 SDL_memcpy(to, from, (unsigned)(len) * (bpp)); \ |
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127 } \ |
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128 } while(0) |
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129 |
| 0 | 130 /* |
| 131 * Various colorkey blit methods, for opaque and per-surface alpha | |
| 132 */ | |
| 133 | |
| 134 #define OPAQUE_BLIT(to, from, length, bpp, alpha) \ | |
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135 PIXEL_COPY(to, from, length, bpp) |
| 0 | 136 |
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137 #ifdef MMX_ASMBLIT |
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138 |
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139 #define ALPHA_BLIT32_888MMX(to, from, length, bpp, alpha) \ |
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140 do { \ |
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141 Uint32 *srcp = (Uint32 *)(from); \ |
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142 Uint32 *dstp = (Uint32 *)(to); \ |
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143 int i = 0x00FF00FF; \ |
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144 movd_m2r(*(&i), mm3); \ |
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145 punpckldq_r2r(mm3, mm3); \ |
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146 i = 0xFF000000; \ |
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147 movd_m2r(*(&i), mm7); \ |
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148 punpckldq_r2r(mm7, mm7); \ |
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149 i = alpha | alpha << 16; \ |
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150 movd_m2r(*(&i), mm4); \ |
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151 punpckldq_r2r(mm4, mm4); \ |
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152 pcmpeqd_r2r(mm5,mm5); /* set mm5 to "1" */ \ |
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153 pxor_r2r(mm7, mm5); /* make clear alpha mask */ \ |
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154 i = length; \ |
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155 if(i & 1) { \ |
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156 movd_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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157 punpcklbw_r2r(mm1, mm1); \ |
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158 pand_r2r(mm3, mm1); \ |
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159 movd_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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160 punpcklbw_r2r(mm2, mm2); \ |
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161 pand_r2r(mm3, mm2); \ |
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162 psubw_r2r(mm2, mm1); \ |
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163 pmullw_r2r(mm4, mm1); \ |
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164 psrlw_i2r(8, mm1); \ |
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165 paddw_r2r(mm1, mm2); \ |
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166 pand_r2r(mm3, mm2); \ |
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167 packuswb_r2r(mm2, mm2); \ |
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168 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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169 movd_r2m(mm2, *dstp); \ |
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170 ++srcp; \ |
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171 ++dstp; \ |
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172 i--; \ |
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173 } \ |
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174 for(; i > 0; --i) { \ |
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175 movq_m2r((*srcp), mm0); \ |
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176 movq_r2r(mm0, mm1); \ |
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177 punpcklbw_r2r(mm0, mm0); \ |
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178 movq_m2r((*dstp), mm2); \ |
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179 punpckhbw_r2r(mm1, mm1); \ |
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180 movq_r2r(mm2, mm6); \ |
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181 pand_r2r(mm3, mm0); \ |
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182 punpcklbw_r2r(mm2, mm2); \ |
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183 pand_r2r(mm3, mm1); \ |
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184 punpckhbw_r2r(mm6, mm6); \ |
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185 pand_r2r(mm3, mm2); \ |
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186 psubw_r2r(mm2, mm0); \ |
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187 pmullw_r2r(mm4, mm0); \ |
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188 pand_r2r(mm3, mm6); \ |
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189 psubw_r2r(mm6, mm1); \ |
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190 pmullw_r2r(mm4, mm1); \ |
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191 psrlw_i2r(8, mm0); \ |
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192 paddw_r2r(mm0, mm2); \ |
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193 psrlw_i2r(8, mm1); \ |
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194 paddw_r2r(mm1, mm6); \ |
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195 pand_r2r(mm3, mm2); \ |
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196 pand_r2r(mm3, mm6); \ |
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197 packuswb_r2r(mm2, mm2); \ |
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198 packuswb_r2r(mm6, mm6); \ |
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199 psrlq_i2r(32, mm2); \ |
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200 psllq_i2r(32, mm6); \ |
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201 por_r2r(mm6, mm2); \ |
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202 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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203 movq_r2m(mm2, *dstp); \ |
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204 srcp += 2; \ |
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205 dstp += 2; \ |
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206 i--; \ |
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207 } \ |
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208 emms(); \ |
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209 } while(0) |
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210 |
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211 #define ALPHA_BLIT16_565MMX(to, from, length, bpp, alpha) \ |
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212 do { \ |
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213 int i, n = 0; \ |
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214 Uint16 *srcp = (Uint16 *)(from); \ |
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215 Uint16 *dstp = (Uint16 *)(to); \ |
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216 Uint32 ALPHA = 0xF800; \ |
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217 movd_m2r(*(&ALPHA), mm1); \ |
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218 punpcklwd_r2r(mm1, mm1); \ |
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219 punpcklwd_r2r(mm1, mm1); \ |
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220 ALPHA = 0x07E0; \ |
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221 movd_m2r(*(&ALPHA), mm4); \ |
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222 punpcklwd_r2r(mm4, mm4); \ |
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223 punpcklwd_r2r(mm4, mm4); \ |
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224 ALPHA = 0x001F; \ |
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225 movd_m2r(*(&ALPHA), mm7); \ |
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226 punpcklwd_r2r(mm7, mm7); \ |
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227 punpcklwd_r2r(mm7, mm7); \ |
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228 alpha &= ~(1+2+4); \ |
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229 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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230 movd_m2r(*(&i), mm0); \ |
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231 punpckldq_r2r(mm0, mm0); \ |
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232 ALPHA = alpha >> 3; \ |
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233 i = ((int)(length) & 3); \ |
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234 for(; i > 0; --i) { \ |
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235 Uint32 s = *srcp++; \ |
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236 Uint32 d = *dstp; \ |
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237 s = (s | s << 16) & 0x07e0f81f; \ |
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238 d = (d | d << 16) & 0x07e0f81f; \ |
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239 d += (s - d) * ALPHA >> 5; \ |
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240 d &= 0x07e0f81f; \ |
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241 *dstp++ = d | d >> 16; \ |
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242 n++; \ |
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243 } \ |
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244 i = (int)(length) - n; \ |
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245 for(; i > 0; --i) { \ |
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246 movq_m2r((*dstp), mm3); \ |
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247 movq_m2r((*srcp), mm2); \ |
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248 movq_r2r(mm2, mm5); \ |
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249 pand_r2r(mm1 , mm5); \ |
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250 psrlq_i2r(11, mm5); \ |
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251 movq_r2r(mm3, mm6); \ |
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252 pand_r2r(mm1 , mm6); \ |
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253 psrlq_i2r(11, mm6); \ |
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254 psubw_r2r(mm6, mm5); \ |
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255 pmullw_r2r(mm0, mm5); \ |
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256 psrlw_i2r(8, mm5); \ |
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257 paddw_r2r(mm5, mm6); \ |
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258 psllq_i2r(11, mm6); \ |
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259 pand_r2r(mm1, mm6); \ |
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260 movq_r2r(mm4, mm5); \ |
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261 por_r2r(mm7, mm5); \ |
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262 pand_r2r(mm5, mm3); \ |
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263 por_r2r(mm6, mm3); \ |
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264 movq_r2r(mm2, mm5); \ |
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265 pand_r2r(mm4 , mm5); \ |
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266 psrlq_i2r(5, mm5); \ |
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267 movq_r2r(mm3, mm6); \ |
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268 pand_r2r(mm4 , mm6); \ |
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269 psrlq_i2r(5, mm6); \ |
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270 psubw_r2r(mm6, mm5); \ |
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271 pmullw_r2r(mm0, mm5); \ |
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272 psrlw_i2r(8, mm5); \ |
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273 paddw_r2r(mm5, mm6); \ |
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274 psllq_i2r(5, mm6); \ |
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275 pand_r2r(mm4, mm6); \ |
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276 movq_r2r(mm1, mm5); \ |
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277 por_r2r(mm7, mm5); \ |
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278 pand_r2r(mm5, mm3); \ |
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279 por_r2r(mm6, mm3); \ |
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280 movq_r2r(mm2, mm5); \ |
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281 pand_r2r(mm7 , mm5); \ |
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282 movq_r2r(mm3, mm6); \ |
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283 pand_r2r(mm7 , mm6); \ |
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284 psubw_r2r(mm6, mm5); \ |
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285 pmullw_r2r(mm0, mm5); \ |
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286 psrlw_i2r(8, mm5); \ |
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287 paddw_r2r(mm5, mm6); \ |
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288 pand_r2r(mm7, mm6); \ |
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289 movq_r2r(mm1, mm5); \ |
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290 por_r2r(mm4, mm5); \ |
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291 pand_r2r(mm5, mm3); \ |
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292 por_r2r(mm6, mm3); \ |
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293 movq_r2m(mm3, *dstp); \ |
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294 srcp += 4; \ |
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295 dstp += 4; \ |
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296 i -= 3; \ |
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297 } \ |
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298 emms(); \ |
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299 } while(0) |
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300 |
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301 #define ALPHA_BLIT16_555MMX(to, from, length, bpp, alpha) \ |
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302 do { \ |
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303 int i, n = 0; \ |
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304 Uint16 *srcp = (Uint16 *)(from); \ |
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305 Uint16 *dstp = (Uint16 *)(to); \ |
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306 Uint32 ALPHA = 0x7C00; \ |
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307 movd_m2r(*(&ALPHA), mm1); \ |
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308 punpcklwd_r2r(mm1, mm1); \ |
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309 punpcklwd_r2r(mm1, mm1); \ |
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310 ALPHA = 0x03E0; \ |
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311 movd_m2r(*(&ALPHA), mm4); \ |
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312 punpcklwd_r2r(mm4, mm4); \ |
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313 punpcklwd_r2r(mm4, mm4); \ |
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314 ALPHA = 0x001F; \ |
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315 movd_m2r(*(&ALPHA), mm7); \ |
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316 punpcklwd_r2r(mm7, mm7); \ |
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317 punpcklwd_r2r(mm7, mm7); \ |
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318 alpha &= ~(1+2+4); \ |
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319 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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320 movd_m2r(*(&i), mm0); \ |
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321 punpckldq_r2r(mm0, mm0); \ |
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322 i = ((int)(length) & 3); \ |
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323 ALPHA = alpha >> 3; \ |
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324 for(; i > 0; --i) { \ |
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325 Uint32 s = *srcp++; \ |
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326 Uint32 d = *dstp; \ |
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327 s = (s | s << 16) & 0x03e07c1f; \ |
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328 d = (d | d << 16) & 0x03e07c1f; \ |
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329 d += (s - d) * ALPHA >> 5; \ |
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330 d &= 0x03e07c1f; \ |
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331 *dstp++ = d | d >> 16; \ |
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332 n++; \ |
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333 } \ |
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334 i = (int)(length) - n; \ |
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335 for(; i > 0; --i) { \ |
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336 movq_m2r((*dstp), mm3); \ |
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337 movq_m2r((*srcp), mm2); \ |
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338 movq_r2r(mm2, mm5); \ |
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339 pand_r2r(mm1 , mm5); \ |
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340 psrlq_i2r(10, mm5); \ |
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341 movq_r2r(mm3, mm6); \ |
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342 pand_r2r(mm1 , mm6); \ |
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343 psrlq_i2r(10, mm6); \ |
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344 psubw_r2r(mm6, mm5); \ |
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345 pmullw_r2r(mm0, mm5); \ |
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346 psrlw_i2r(8, mm5); \ |
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347 paddw_r2r(mm5, mm6); \ |
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348 psllq_i2r(10, mm6); \ |
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349 pand_r2r(mm1, mm6); \ |
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350 movq_r2r(mm4, mm5); \ |
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351 por_r2r(mm7, mm5); \ |
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352 pand_r2r(mm5, mm3); \ |
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353 por_r2r(mm6, mm3); \ |
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354 movq_r2r(mm2, mm5); \ |
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355 pand_r2r(mm4 , mm5); \ |
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356 psrlq_i2r(5, mm5); \ |
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357 movq_r2r(mm3, mm6); \ |
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358 pand_r2r(mm4 , mm6); \ |
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359 psrlq_i2r(5, mm6); \ |
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360 psubw_r2r(mm6, mm5); \ |
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361 pmullw_r2r(mm0, mm5); \ |
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362 psrlw_i2r(8, mm5); \ |
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363 paddw_r2r(mm5, mm6); \ |
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364 psllq_i2r(5, mm6); \ |
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365 pand_r2r(mm4, mm6); \ |
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366 movq_r2r(mm1, mm5); \ |
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367 por_r2r(mm7, mm5); \ |
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368 pand_r2r(mm5, mm3); \ |
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369 por_r2r(mm6, mm3); \ |
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370 movq_r2r(mm2, mm5); \ |
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371 pand_r2r(mm7 , mm5); \ |
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372 movq_r2r(mm3, mm6); \ |
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373 pand_r2r(mm7 , mm6); \ |
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374 psubw_r2r(mm6, mm5); \ |
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375 pmullw_r2r(mm0, mm5); \ |
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376 psrlw_i2r(8, mm5); \ |
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377 paddw_r2r(mm5, mm6); \ |
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378 pand_r2r(mm7, mm6); \ |
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379 movq_r2r(mm1, mm5); \ |
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380 por_r2r(mm4, mm5); \ |
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381 pand_r2r(mm5, mm3); \ |
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382 por_r2r(mm6, mm3); \ |
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383 movq_r2m(mm3, *dstp); \ |
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384 srcp += 4; \ |
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385 dstp += 4; \ |
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386 i -= 3; \ |
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387 } \ |
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388 emms(); \ |
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389 } while(0) |
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390 |
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391 #endif |
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392 |
| 0 | 393 /* |
| 394 * For 32bpp pixels on the form 0x00rrggbb: | |
| 395 * If we treat the middle component separately, we can process the two | |
| 396 * remaining in parallel. This is safe to do because of the gap to the left | |
| 397 * of each component, so the bits from the multiplication don't collide. | |
| 398 * This can be used for any RGB permutation of course. | |
| 399 */ | |
| 400 #define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \ | |
| 401 do { \ | |
| 402 int i; \ | |
| 403 Uint32 *src = (Uint32 *)(from); \ | |
| 404 Uint32 *dst = (Uint32 *)(to); \ | |
| 405 for(i = 0; i < (int)(length); i++) { \ | |
| 406 Uint32 s = *src++; \ | |
| 407 Uint32 d = *dst; \ | |
| 408 Uint32 s1 = s & 0xff00ff; \ | |
| 409 Uint32 d1 = d & 0xff00ff; \ | |
| 410 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 411 s &= 0xff00; \ | |
| 412 d &= 0xff00; \ | |
| 413 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 414 *dst++ = d1 | d; \ | |
| 415 } \ | |
| 416 } while(0) | |
| 417 | |
| 418 /* | |
| 419 * For 16bpp pixels we can go a step further: put the middle component | |
| 420 * in the high 16 bits of a 32 bit word, and process all three RGB | |
| 421 * components at the same time. Since the smallest gap is here just | |
| 422 * 5 bits, we have to scale alpha down to 5 bits as well. | |
| 423 */ | |
| 424 #define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \ | |
| 425 do { \ | |
| 426 int i; \ | |
| 427 Uint16 *src = (Uint16 *)(from); \ | |
| 428 Uint16 *dst = (Uint16 *)(to); \ | |
|
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429 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 430 for(i = 0; i < (int)(length); i++) { \ |
| 431 Uint32 s = *src++; \ | |
| 432 Uint32 d = *dst; \ | |
| 433 s = (s | s << 16) & 0x07e0f81f; \ | |
| 434 d = (d | d << 16) & 0x07e0f81f; \ | |
|
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435 d += (s - d) * ALPHA >> 5; \ |
| 0 | 436 d &= 0x07e0f81f; \ |
| 437 *dst++ = d | d >> 16; \ | |
| 438 } \ | |
| 439 } while(0) | |
| 440 | |
| 441 #define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \ | |
| 442 do { \ | |
| 443 int i; \ | |
| 444 Uint16 *src = (Uint16 *)(from); \ | |
| 445 Uint16 *dst = (Uint16 *)(to); \ | |
|
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446 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 447 for(i = 0; i < (int)(length); i++) { \ |
| 448 Uint32 s = *src++; \ | |
| 449 Uint32 d = *dst; \ | |
| 450 s = (s | s << 16) & 0x03e07c1f; \ | |
| 451 d = (d | d << 16) & 0x03e07c1f; \ | |
|
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452 d += (s - d) * ALPHA >> 5; \ |
| 0 | 453 d &= 0x03e07c1f; \ |
| 454 *dst++ = d | d >> 16; \ | |
| 455 } \ | |
| 456 } while(0) | |
| 457 | |
| 458 /* | |
| 459 * The general slow catch-all function, for remaining depths and formats | |
| 460 */ | |
| 461 #define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \ | |
| 462 do { \ | |
| 463 int i; \ | |
| 464 Uint8 *src = from; \ | |
| 465 Uint8 *dst = to; \ | |
| 466 for(i = 0; i < (int)(length); i++) { \ | |
| 467 Uint32 s, d; \ | |
| 468 unsigned rs, gs, bs, rd, gd, bd; \ | |
| 469 switch(bpp) { \ | |
| 470 case 2: \ | |
| 471 s = *(Uint16 *)src; \ | |
| 472 d = *(Uint16 *)dst; \ | |
| 473 break; \ | |
| 474 case 3: \ | |
| 475 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 476 s = (src[0] << 16) | (src[1] << 8) | src[2]; \ | |
| 477 d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \ | |
| 478 } else { \ | |
| 479 s = (src[2] << 16) | (src[1] << 8) | src[0]; \ | |
| 480 d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \ | |
| 481 } \ | |
| 482 break; \ | |
| 483 case 4: \ | |
| 484 s = *(Uint32 *)src; \ | |
| 485 d = *(Uint32 *)dst; \ | |
| 486 break; \ | |
| 487 } \ | |
| 488 RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \ | |
| 489 RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \ | |
| 490 rd += (rs - rd) * alpha >> 8; \ | |
| 491 gd += (gs - gd) * alpha >> 8; \ | |
| 492 bd += (bs - bd) * alpha >> 8; \ | |
| 493 PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \ | |
| 494 switch(bpp) { \ | |
| 495 case 2: \ | |
| 496 *(Uint16 *)dst = d; \ | |
| 497 break; \ | |
| 498 case 3: \ | |
| 499 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 500 dst[0] = d >> 16; \ | |
| 501 dst[1] = d >> 8; \ | |
| 502 dst[2] = d; \ | |
| 503 } else { \ | |
| 504 dst[0] = d; \ | |
| 505 dst[1] = d >> 8; \ | |
| 506 dst[2] = d >> 16; \ | |
| 507 } \ | |
| 508 break; \ | |
| 509 case 4: \ | |
| 510 *(Uint32 *)dst = d; \ | |
| 511 break; \ | |
| 512 } \ | |
| 513 src += bpp; \ | |
| 514 dst += bpp; \ | |
| 515 } \ | |
| 516 } while(0) | |
| 517 | |
|
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518 #ifdef MMX_ASMBLIT |
| 0 | 519 |
|
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520 #define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha) \ |
|
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521 do { \ |
|
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522 Uint32 *srcp = (Uint32 *)(from); \ |
|
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523 Uint32 *dstp = (Uint32 *)(to); \ |
|
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524 int i = 0x00fefefe; \ |
|
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525 movd_m2r(*(&i), mm4); \ |
|
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526 punpckldq_r2r(mm4, mm4); \ |
|
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527 i = 0x00010101; \ |
|
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528 movd_m2r(*(&i), mm3); \ |
|
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529 punpckldq_r2r(mm3, mm3); \ |
|
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530 i = (int)(length); \ |
|
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531 if( i & 1 ) { \ |
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532 Uint32 s = *srcp++; \ |
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533 Uint32 d = *dstp; \ |
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534 *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ |
|
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535 + (s & d & 0x00010101); \ |
|
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536 i--; \ |
|
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537 } \ |
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538 for(; i > 0; --i) { \ |
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539 movq_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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540 movq_r2r(mm2, mm6); /* dst -> mm6 */ \ |
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541 movq_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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542 movq_r2r(mm1, mm5); /* src -> mm5 */ \ |
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543 pand_r2r(mm4, mm6); /* dst & 0x00fefefe -> mm6 */ \ |
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544 pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */ \ |
|
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545 paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */ \ |
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546 psrld_i2r(1, mm5); \ |
|
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547 pand_r2r(mm1, mm2); /* s & d -> mm2 */ \ |
|
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548 pand_r2r(mm3, mm2); /* s & d & 0x00010101 -> mm2 */ \ |
|
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549 paddd_r2r(mm5, mm2); \ |
|
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550 movq_r2m(mm2, (*dstp)); \ |
|
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551 dstp += 2; \ |
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552 srcp += 2; \ |
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553 i--; \ |
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554 } \ |
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555 emms(); \ |
|
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556 } while(0) |
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557 |
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558 #endif |
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559 |
| 0 | 560 /* |
| 561 * Special case: 50% alpha (alpha=128) | |
| 562 * This is treated specially because it can be optimized very well, and | |
| 563 * since it is good for many cases of semi-translucency. | |
| 564 * The theory is to do all three components at the same time: | |
| 565 * First zero the lowest bit of each component, which gives us room to | |
| 566 * add them. Then shift right and add the sum of the lowest bits. | |
| 567 */ | |
| 568 #define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \ | |
| 569 do { \ | |
| 570 int i; \ | |
| 571 Uint32 *src = (Uint32 *)(from); \ | |
| 572 Uint32 *dst = (Uint32 *)(to); \ | |
| 573 for(i = 0; i < (int)(length); i++) { \ | |
| 574 Uint32 s = *src++; \ | |
| 575 Uint32 d = *dst; \ | |
| 576 *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ | |
| 577 + (s & d & 0x00010101); \ | |
| 578 } \ | |
| 579 } while(0) | |
| 580 | |
| 581 /* | |
| 582 * For 16bpp, we can actually blend two pixels in parallel, if we take | |
| 583 * care to shift before we add, not after. | |
| 584 */ | |
| 585 | |
| 586 /* helper: blend a single 16 bit pixel at 50% */ | |
| 587 #define BLEND16_50(dst, src, mask) \ | |
| 588 do { \ | |
| 589 Uint32 s = *src++; \ | |
| 590 Uint32 d = *dst; \ | |
| 591 *dst++ = (((s & mask) + (d & mask)) >> 1) \ | |
| 592 + (s & d & (~mask & 0xffff)); \ | |
| 593 } while(0) | |
| 594 | |
| 595 /* basic 16bpp blender. mask is the pixels to keep when adding. */ | |
| 596 #define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \ | |
| 597 do { \ | |
| 598 unsigned n = (length); \ | |
| 599 Uint16 *src = (Uint16 *)(from); \ | |
| 600 Uint16 *dst = (Uint16 *)(to); \ | |
| 601 if(((unsigned long)src ^ (unsigned long)dst) & 3) { \ | |
| 602 /* source and destination not in phase, blit one by one */ \ | |
| 603 while(n--) \ | |
| 604 BLEND16_50(dst, src, mask); \ | |
| 605 } else { \ | |
| 606 if((unsigned long)src & 3) { \ | |
| 607 /* first odd pixel */ \ | |
| 608 BLEND16_50(dst, src, mask); \ | |
| 609 n--; \ | |
| 610 } \ | |
| 611 for(; n > 1; n -= 2) { \ | |
| 612 Uint32 s = *(Uint32 *)src; \ | |
| 613 Uint32 d = *(Uint32 *)dst; \ | |
| 614 *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \ | |
| 615 + ((d & (mask | mask << 16)) >> 1) \ | |
| 616 + (s & d & (~(mask | mask << 16))); \ | |
| 617 src += 2; \ | |
| 618 dst += 2; \ | |
| 619 } \ | |
| 620 if(n) \ | |
| 621 BLEND16_50(dst, src, mask); /* last odd pixel */ \ | |
| 622 } \ | |
| 623 } while(0) | |
| 624 | |
| 625 #define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \ | |
| 626 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de) | |
| 627 | |
| 628 #define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \ | |
| 629 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde) | |
| 630 | |
|
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631 #ifdef MMX_ASMBLIT |
| 0 | 632 |
| 633 #define CHOOSE_BLIT(blitter, alpha, fmt) \ | |
| 634 do { \ | |
| 635 if(alpha == 255) { \ | |
| 636 switch(fmt->BytesPerPixel) { \ | |
| 637 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ | |
| 638 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ | |
| 639 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ | |
| 640 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ | |
| 641 } \ | |
| 642 } else { \ | |
| 643 switch(fmt->BytesPerPixel) { \ | |
| 644 case 1: \ | |
| 645 /* No 8bpp alpha blitting */ \ | |
| 646 break; \ | |
| 647 \ | |
| 648 case 2: \ | |
| 649 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ | |
| 650 case 0xffff: \ | |
| 651 if(fmt->Gmask == 0x07e0 \ | |
| 652 || fmt->Rmask == 0x07e0 \ | |
| 653 || fmt->Bmask == 0x07e0) { \ | |
| 654 if(alpha == 128) \ | |
| 655 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ | |
| 656 else { \ | |
|
739
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657 if(SDL_HasMMX()) \ |
|
689
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658 blitter(2, Uint8, ALPHA_BLIT16_565MMX); \ |
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659 else \ |
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660 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
|
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661 } \ |
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662 } else \ |
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663 goto general16; \ |
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664 break; \ |
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665 \ |
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666 case 0x7fff: \ |
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667 if(fmt->Gmask == 0x03e0 \ |
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668 || fmt->Rmask == 0x03e0 \ |
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669 || fmt->Bmask == 0x03e0) { \ |
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670 if(alpha == 128) \ |
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671 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ |
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672 else { \ |
|
739
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Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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673 if(SDL_HasMMX()) \ |
|
689
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674 blitter(2, Uint8, ALPHA_BLIT16_555MMX); \ |
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675 else \ |
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676 blitter(2, Uint8, ALPHA_BLIT16_555); \ |
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677 } \ |
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678 break; \ |
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679 } \ |
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680 /* fallthrough */ \ |
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681 \ |
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682 default: \ |
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683 general16: \ |
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684 blitter(2, Uint8, ALPHA_BLIT_ANY); \ |
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685 } \ |
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686 break; \ |
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687 \ |
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688 case 3: \ |
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689 blitter(3, Uint8, ALPHA_BLIT_ANY); \ |
|
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690 break; \ |
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691 \ |
|
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692 case 4: \ |
|
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|
693 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ |
|
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694 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ |
|
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695 || fmt->Bmask == 0xff00)) { \ |
|
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696 if(alpha == 128) \ |
|
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697 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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698 if(SDL_HasMMX()) \ |
|
689
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699 blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\ |
|
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700 else \ |
|
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701 blitter(4, Uint16, ALPHA_BLIT32_888_50);\ |
|
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702 } \ |
|
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|
703 else \ |
|
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|
704 { \ |
|
739
22dbf364c017
Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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|
705 if(SDL_HasMMX()) \ |
|
689
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706 blitter(4, Uint16, ALPHA_BLIT32_888MMX);\ |
|
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707 else \ |
|
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708 blitter(4, Uint16, ALPHA_BLIT32_888); \ |
|
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709 } \ |
|
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710 } else \ |
|
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|
711 blitter(4, Uint16, ALPHA_BLIT_ANY); \ |
|
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|
712 break; \ |
|
5bb080d35049
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|
713 } \ |
|
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|
714 } \ |
|
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Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
715 } while(0) |
|
5bb080d35049
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|
716 |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
717 #else |
|
5bb080d35049
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|
718 |
|
5bb080d35049
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|
719 #define CHOOSE_BLIT(blitter, alpha, fmt) \ |
|
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|
720 do { \ |
|
5bb080d35049
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721 if(alpha == 255) { \ |
|
5bb080d35049
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|
722 switch(fmt->BytesPerPixel) { \ |
|
5bb080d35049
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|
723 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
724 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ |
|
5bb080d35049
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|
725 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ |
|
5bb080d35049
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|
726 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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727 } \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
728 } else { \ |
|
5bb080d35049
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|
729 switch(fmt->BytesPerPixel) { \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
730 case 1: \ |
|
5bb080d35049
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|
731 /* No 8bpp alpha blitting */ \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
732 break; \ |
|
5bb080d35049
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|
733 \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
734 case 2: \ |
|
5bb080d35049
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|
735 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ |
|
5bb080d35049
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|
736 case 0xffff: \ |
|
5bb080d35049
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|
737 if(fmt->Gmask == 0x07e0 \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
738 || fmt->Rmask == 0x07e0 \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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|
739 || fmt->Bmask == 0x07e0) { \ |
|
5bb080d35049
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parents:
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diff
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|
740 if(alpha == 128) \ |
|
5bb080d35049
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|
741 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ |
|
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|
742 else { \ |
| 0 | 743 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
| 744 } \ | |
| 745 } else \ | |
| 746 goto general16; \ | |
| 747 break; \ | |
| 748 \ | |
| 749 case 0x7fff: \ | |
| 750 if(fmt->Gmask == 0x03e0 \ | |
| 751 || fmt->Rmask == 0x03e0 \ | |
| 752 || fmt->Bmask == 0x03e0) { \ | |
| 753 if(alpha == 128) \ | |
| 754 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ | |
| 755 else { \ | |
| 756 blitter(2, Uint8, ALPHA_BLIT16_555); \ | |
| 757 } \ | |
| 758 break; \ | |
| 759 } \ | |
| 760 /* fallthrough */ \ | |
| 761 \ | |
| 762 default: \ | |
| 763 general16: \ | |
| 764 blitter(2, Uint8, ALPHA_BLIT_ANY); \ | |
| 765 } \ | |
| 766 break; \ | |
| 767 \ | |
| 768 case 3: \ | |
| 769 blitter(3, Uint8, ALPHA_BLIT_ANY); \ | |
| 770 break; \ | |
| 771 \ | |
| 772 case 4: \ | |
| 773 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ | |
| 774 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ | |
| 775 || fmt->Bmask == 0xff00)) { \ | |
| 776 if(alpha == 128) \ | |
| 777 blitter(4, Uint16, ALPHA_BLIT32_888_50); \ | |
| 778 else \ | |
| 779 blitter(4, Uint16, ALPHA_BLIT32_888); \ | |
| 780 } else \ | |
| 781 blitter(4, Uint16, ALPHA_BLIT_ANY); \ | |
| 782 break; \ | |
| 783 } \ | |
| 784 } \ | |
| 785 } while(0) | |
| 786 | |
|
689
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diff
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|
787 #endif |
| 0 | 788 |
| 789 /* | |
| 790 * This takes care of the case when the surface is clipped on the left and/or | |
| 791 * right. Top clipping has already been taken care of. | |
| 792 */ | |
| 793 static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 794 Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha) | |
| 795 { | |
| 796 SDL_PixelFormat *fmt = dst->format; | |
| 797 | |
| 798 #define RLECLIPBLIT(bpp, Type, do_blit) \ | |
| 799 do { \ | |
| 800 int linecount = srcrect->h; \ | |
| 801 int ofs = 0; \ | |
| 802 int left = srcrect->x; \ | |
| 803 int right = left + srcrect->w; \ | |
| 804 dstbuf -= left * bpp; \ | |
| 805 for(;;) { \ | |
| 806 int run; \ | |
| 807 ofs += *(Type *)srcbuf; \ | |
| 808 run = ((Type *)srcbuf)[1]; \ | |
| 809 srcbuf += 2 * sizeof(Type); \ | |
| 810 if(run) { \ | |
| 811 /* clip to left and right borders */ \ | |
| 812 if(ofs < right) { \ | |
| 813 int start = 0; \ | |
| 814 int len = run; \ | |
| 815 int startcol; \ | |
| 816 if(left - ofs > 0) { \ | |
| 817 start = left - ofs; \ | |
| 818 len -= start; \ | |
| 819 if(len <= 0) \ | |
| 820 goto nocopy ## bpp ## do_blit; \ | |
| 821 } \ | |
| 822 startcol = ofs + start; \ | |
| 823 if(len > right - startcol) \ | |
| 824 len = right - startcol; \ | |
| 825 do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \ | |
| 826 len, bpp, alpha); \ | |
| 827 } \ | |
| 828 nocopy ## bpp ## do_blit: \ | |
| 829 srcbuf += run * bpp; \ | |
| 830 ofs += run; \ | |
| 831 } else if(!ofs) \ | |
| 832 break; \ | |
| 833 if(ofs == w) { \ | |
| 834 ofs = 0; \ | |
| 835 dstbuf += dst->pitch; \ | |
| 836 if(!--linecount) \ | |
| 837 break; \ | |
| 838 } \ | |
| 839 } \ | |
| 840 } while(0) | |
| 841 | |
| 842 CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); | |
| 843 | |
| 844 #undef RLECLIPBLIT | |
| 845 | |
| 846 } | |
| 847 | |
| 848 | |
| 849 /* blit a colorkeyed RLE surface */ | |
| 850 int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 851 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 852 { | |
| 853 Uint8 *dstbuf; | |
| 854 Uint8 *srcbuf; | |
| 855 int x, y; | |
| 856 int w = src->w; | |
| 857 unsigned alpha; | |
| 858 | |
| 859 /* Lock the destination if necessary */ | |
|
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|
860 if ( SDL_MUSTLOCK(dst) ) { |
|
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
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changeset
|
861 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 862 return(-1); |
| 863 } | |
| 864 } | |
| 865 | |
| 866 /* Set up the source and destination pointers */ | |
| 867 x = dstrect->x; | |
| 868 y = dstrect->y; | |
|
526
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|
869 dstbuf = (Uint8 *)dst->pixels |
| 0 | 870 + y * dst->pitch + x * src->format->BytesPerPixel; |
| 871 srcbuf = (Uint8 *)src->map->sw_data->aux_data; | |
| 872 | |
| 873 { | |
| 874 /* skip lines at the top if neccessary */ | |
| 875 int vskip = srcrect->y; | |
| 876 int ofs = 0; | |
| 877 if(vskip) { | |
| 878 | |
| 879 #define RLESKIP(bpp, Type) \ | |
| 880 for(;;) { \ | |
| 881 int run; \ | |
| 882 ofs += *(Type *)srcbuf; \ | |
| 883 run = ((Type *)srcbuf)[1]; \ | |
| 884 srcbuf += sizeof(Type) * 2; \ | |
| 885 if(run) { \ | |
| 886 srcbuf += run * bpp; \ | |
| 887 ofs += run; \ | |
| 888 } else if(!ofs) \ | |
| 889 goto done; \ | |
| 890 if(ofs == w) { \ | |
| 891 ofs = 0; \ | |
| 892 if(!--vskip) \ | |
| 893 break; \ | |
| 894 } \ | |
| 895 } | |
| 896 | |
| 897 switch(src->format->BytesPerPixel) { | |
| 898 case 1: RLESKIP(1, Uint8); break; | |
| 899 case 2: RLESKIP(2, Uint8); break; | |
| 900 case 3: RLESKIP(3, Uint8); break; | |
| 901 case 4: RLESKIP(4, Uint16); break; | |
| 902 } | |
| 903 | |
| 904 #undef RLESKIP | |
| 905 | |
| 906 } | |
| 907 } | |
| 908 | |
| 909 alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 910 ? src->format->alpha : 255; | |
| 911 /* if left or right edge clipping needed, call clip blit */ | |
| 912 if ( srcrect->x || srcrect->w != src->w ) { | |
| 913 RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); | |
| 914 } else { | |
| 915 SDL_PixelFormat *fmt = src->format; | |
| 916 | |
| 917 #define RLEBLIT(bpp, Type, do_blit) \ | |
| 918 do { \ | |
| 919 int linecount = srcrect->h; \ | |
| 920 int ofs = 0; \ | |
| 921 for(;;) { \ | |
| 922 unsigned run; \ | |
| 923 ofs += *(Type *)srcbuf; \ | |
| 924 run = ((Type *)srcbuf)[1]; \ | |
| 925 srcbuf += 2 * sizeof(Type); \ | |
| 926 if(run) { \ | |
| 927 do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \ | |
| 928 srcbuf += run * bpp; \ | |
| 929 ofs += run; \ | |
| 930 } else if(!ofs) \ | |
| 931 break; \ | |
| 932 if(ofs == w) { \ | |
| 933 ofs = 0; \ | |
| 934 dstbuf += dst->pitch; \ | |
| 935 if(!--linecount) \ | |
| 936 break; \ | |
| 937 } \ | |
| 938 } \ | |
| 939 } while(0) | |
| 940 | |
| 941 CHOOSE_BLIT(RLEBLIT, alpha, fmt); | |
| 942 | |
| 943 #undef RLEBLIT | |
| 944 } | |
| 945 | |
| 946 done: | |
| 947 /* Unlock the destination if necessary */ | |
|
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|
948 if ( SDL_MUSTLOCK(dst) ) { |
|
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changeset
|
949 SDL_UnlockSurface(dst); |
| 0 | 950 } |
| 951 return(0); | |
| 952 } | |
| 953 | |
| 954 #undef OPAQUE_BLIT | |
| 955 | |
| 956 /* | |
| 957 * Per-pixel blitting macros for translucent pixels: | |
| 958 * These use the same techniques as the per-surface blitting macros | |
| 959 */ | |
| 960 | |
| 961 /* | |
| 962 * For 32bpp pixels, we have made sure the alpha is stored in the top | |
| 963 * 8 bits, so proceed as usual | |
| 964 */ | |
| 965 #define BLIT_TRANSL_888(src, dst) \ | |
| 966 do { \ | |
| 967 Uint32 s = src; \ | |
| 968 Uint32 d = dst; \ | |
| 969 unsigned alpha = s >> 24; \ | |
| 970 Uint32 s1 = s & 0xff00ff; \ | |
| 971 Uint32 d1 = d & 0xff00ff; \ | |
| 972 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 973 s &= 0xff00; \ | |
| 974 d &= 0xff00; \ | |
| 975 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 976 dst = d1 | d; \ | |
| 977 } while(0) | |
| 978 | |
| 979 /* | |
| 980 * For 16bpp pixels, we have stored the 5 most significant alpha bits in | |
| 981 * bits 5-10. As before, we can process all 3 RGB components at the same time. | |
| 982 */ | |
| 983 #define BLIT_TRANSL_565(src, dst) \ | |
| 984 do { \ | |
| 985 Uint32 s = src; \ | |
| 986 Uint32 d = dst; \ | |
| 987 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 988 s &= 0x07e0f81f; \ | |
| 989 d = (d | d << 16) & 0x07e0f81f; \ | |
| 990 d += (s - d) * alpha >> 5; \ | |
| 991 d &= 0x07e0f81f; \ | |
| 992 dst = d | d >> 16; \ | |
| 993 } while(0) | |
| 994 | |
| 995 #define BLIT_TRANSL_555(src, dst) \ | |
| 996 do { \ | |
| 997 Uint32 s = src; \ | |
| 998 Uint32 d = dst; \ | |
| 999 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 1000 s &= 0x03e07c1f; \ | |
| 1001 d = (d | d << 16) & 0x03e07c1f; \ | |
| 1002 d += (s - d) * alpha >> 5; \ | |
| 1003 d &= 0x03e07c1f; \ | |
| 1004 dst = d | d >> 16; \ | |
| 1005 } while(0) | |
| 1006 | |
| 1007 /* used to save the destination format in the encoding. Designed to be | |
| 1008 macro-compatible with SDL_PixelFormat but without the unneeded fields */ | |
| 1009 typedef struct { | |
| 1010 Uint8 BytesPerPixel; | |
| 1011 Uint8 Rloss; | |
| 1012 Uint8 Gloss; | |
| 1013 Uint8 Bloss; | |
| 1014 Uint8 Rshift; | |
| 1015 Uint8 Gshift; | |
| 1016 Uint8 Bshift; | |
| 1017 Uint8 Ashift; | |
| 1018 Uint32 Rmask; | |
| 1019 Uint32 Gmask; | |
| 1020 Uint32 Bmask; | |
| 1021 Uint32 Amask; | |
| 1022 } RLEDestFormat; | |
| 1023 | |
| 1024 /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ | |
| 1025 static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 1026 Uint8 *dstbuf, SDL_Rect *srcrect) | |
| 1027 { | |
| 1028 SDL_PixelFormat *df = dst->format; | |
| 1029 /* | |
| 1030 * clipped blitter: Ptype is the destination pixel type, | |
| 1031 * Ctype the translucent count type, and do_blend the macro | |
| 1032 * to blend one pixel. | |
| 1033 */ | |
| 1034 #define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \ | |
| 1035 do { \ | |
| 1036 int linecount = srcrect->h; \ | |
| 1037 int left = srcrect->x; \ | |
| 1038 int right = left + srcrect->w; \ | |
| 1039 dstbuf -= left * sizeof(Ptype); \ | |
| 1040 do { \ | |
| 1041 int ofs = 0; \ | |
| 1042 /* blit opaque pixels on one line */ \ | |
| 1043 do { \ | |
| 1044 unsigned run; \ | |
| 1045 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1046 run = ((Ctype *)srcbuf)[1]; \ | |
| 1047 srcbuf += 2 * sizeof(Ctype); \ | |
| 1048 if(run) { \ | |
| 1049 /* clip to left and right borders */ \ | |
| 1050 int cofs = ofs; \ | |
| 1051 int crun = run; \ | |
| 1052 if(left - cofs > 0) { \ | |
| 1053 crun -= left - cofs; \ | |
| 1054 cofs = left; \ | |
| 1055 } \ | |
| 1056 if(crun > right - cofs) \ | |
| 1057 crun = right - cofs; \ | |
| 1058 if(crun > 0) \ | |
|
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1059 PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \ |
| 0 | 1060 srcbuf + (cofs - ofs) * sizeof(Ptype), \ |
|
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1061 (unsigned)crun, sizeof(Ptype)); \ |
| 0 | 1062 srcbuf += run * sizeof(Ptype); \ |
| 1063 ofs += run; \ | |
| 1064 } else if(!ofs) \ | |
| 1065 return; \ | |
| 1066 } while(ofs < w); \ | |
| 1067 /* skip padding if necessary */ \ | |
| 1068 if(sizeof(Ptype) == 2) \ | |
| 1069 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1070 /* blit translucent pixels on the same line */ \ | |
| 1071 ofs = 0; \ | |
| 1072 do { \ | |
| 1073 unsigned run; \ | |
| 1074 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1075 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1076 srcbuf += 4; \ | |
| 1077 if(run) { \ | |
| 1078 /* clip to left and right borders */ \ | |
| 1079 int cofs = ofs; \ | |
| 1080 int crun = run; \ | |
| 1081 if(left - cofs > 0) { \ | |
| 1082 crun -= left - cofs; \ | |
| 1083 cofs = left; \ | |
| 1084 } \ | |
| 1085 if(crun > right - cofs) \ | |
| 1086 crun = right - cofs; \ | |
| 1087 if(crun > 0) { \ | |
| 1088 Ptype *dst = (Ptype *)dstbuf + cofs; \ | |
| 1089 Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \ | |
| 1090 int i; \ | |
| 1091 for(i = 0; i < crun; i++) \ | |
| 1092 do_blend(src[i], dst[i]); \ | |
| 1093 } \ | |
| 1094 srcbuf += run * 4; \ | |
| 1095 ofs += run; \ | |
| 1096 } \ | |
| 1097 } while(ofs < w); \ | |
| 1098 dstbuf += dst->pitch; \ | |
| 1099 } while(--linecount); \ | |
| 1100 } while(0) | |
| 1101 | |
| 1102 switch(df->BytesPerPixel) { | |
| 1103 case 2: | |
| 1104 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1105 || df->Bmask == 0x07e0) | |
| 1106 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1107 else | |
| 1108 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1109 break; | |
| 1110 case 4: | |
| 1111 RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1112 break; | |
| 1113 } | |
| 1114 } | |
| 1115 | |
| 1116 /* blit a pixel-alpha RLE surface */ | |
| 1117 int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 1118 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 1119 { | |
| 1120 int x, y; | |
| 1121 int w = src->w; | |
| 1122 Uint8 *srcbuf, *dstbuf; | |
| 1123 SDL_PixelFormat *df = dst->format; | |
| 1124 | |
| 1125 /* Lock the destination if necessary */ | |
|
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1126 if ( SDL_MUSTLOCK(dst) ) { |
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1127 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 1128 return -1; |
| 1129 } | |
| 1130 } | |
| 1131 | |
| 1132 x = dstrect->x; | |
| 1133 y = dstrect->y; | |
|
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1134 dstbuf = (Uint8 *)dst->pixels |
| 0 | 1135 + y * dst->pitch + x * df->BytesPerPixel; |
| 1136 srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat); | |
| 1137 | |
| 1138 { | |
| 1139 /* skip lines at the top if necessary */ | |
| 1140 int vskip = srcrect->y; | |
| 1141 if(vskip) { | |
| 1142 int ofs; | |
| 1143 if(df->BytesPerPixel == 2) { | |
| 1144 /* the 16/32 interleaved format */ | |
| 1145 do { | |
| 1146 /* skip opaque line */ | |
| 1147 ofs = 0; | |
| 1148 do { | |
| 1149 int run; | |
| 1150 ofs += srcbuf[0]; | |
| 1151 run = srcbuf[1]; | |
| 1152 srcbuf += 2; | |
| 1153 if(run) { | |
| 1154 srcbuf += 2 * run; | |
| 1155 ofs += run; | |
| 1156 } else if(!ofs) | |
| 1157 goto done; | |
| 1158 } while(ofs < w); | |
| 1159 | |
| 1160 /* skip padding */ | |
| 1161 srcbuf += (unsigned long)srcbuf & 2; | |
| 1162 | |
| 1163 /* skip translucent line */ | |
| 1164 ofs = 0; | |
| 1165 do { | |
| 1166 int run; | |
| 1167 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1168 run = ((Uint16 *)srcbuf)[1]; | |
| 1169 srcbuf += 4 * (run + 1); | |
| 1170 ofs += run; | |
| 1171 } while(ofs < w); | |
| 1172 } while(--vskip); | |
| 1173 } else { | |
| 1174 /* the 32/32 interleaved format */ | |
| 1175 vskip <<= 1; /* opaque and translucent have same format */ | |
| 1176 do { | |
| 1177 ofs = 0; | |
| 1178 do { | |
| 1179 int run; | |
| 1180 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1181 run = ((Uint16 *)srcbuf)[1]; | |
| 1182 srcbuf += 4; | |
| 1183 if(run) { | |
| 1184 srcbuf += 4 * run; | |
| 1185 ofs += run; | |
| 1186 } else if(!ofs) | |
| 1187 goto done; | |
| 1188 } while(ofs < w); | |
| 1189 } while(--vskip); | |
| 1190 } | |
| 1191 } | |
| 1192 } | |
| 1193 | |
| 1194 /* if left or right edge clipping needed, call clip blit */ | |
| 1195 if(srcrect->x || srcrect->w != src->w) { | |
| 1196 RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect); | |
| 1197 } else { | |
| 1198 | |
| 1199 /* | |
| 1200 * non-clipped blitter. Ptype is the destination pixel type, | |
| 1201 * Ctype the translucent count type, and do_blend the | |
| 1202 * macro to blend one pixel. | |
| 1203 */ | |
| 1204 #define RLEALPHABLIT(Ptype, Ctype, do_blend) \ | |
| 1205 do { \ | |
| 1206 int linecount = srcrect->h; \ | |
| 1207 do { \ | |
| 1208 int ofs = 0; \ | |
| 1209 /* blit opaque pixels on one line */ \ | |
| 1210 do { \ | |
| 1211 unsigned run; \ | |
| 1212 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1213 run = ((Ctype *)srcbuf)[1]; \ | |
| 1214 srcbuf += 2 * sizeof(Ctype); \ | |
| 1215 if(run) { \ | |
|
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1216 PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \ |
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1217 run, sizeof(Ptype)); \ |
| 0 | 1218 srcbuf += run * sizeof(Ptype); \ |
| 1219 ofs += run; \ | |
| 1220 } else if(!ofs) \ | |
| 1221 goto done; \ | |
| 1222 } while(ofs < w); \ | |
| 1223 /* skip padding if necessary */ \ | |
| 1224 if(sizeof(Ptype) == 2) \ | |
| 1225 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1226 /* blit translucent pixels on the same line */ \ | |
| 1227 ofs = 0; \ | |
| 1228 do { \ | |
| 1229 unsigned run; \ | |
| 1230 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1231 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1232 srcbuf += 4; \ | |
| 1233 if(run) { \ | |
| 1234 Ptype *dst = (Ptype *)dstbuf + ofs; \ | |
| 1235 unsigned i; \ | |
| 1236 for(i = 0; i < run; i++) { \ | |
| 1237 Uint32 src = *(Uint32 *)srcbuf; \ | |
| 1238 do_blend(src, *dst); \ | |
| 1239 srcbuf += 4; \ | |
| 1240 dst++; \ | |
| 1241 } \ | |
| 1242 ofs += run; \ | |
| 1243 } \ | |
| 1244 } while(ofs < w); \ | |
| 1245 dstbuf += dst->pitch; \ | |
| 1246 } while(--linecount); \ | |
| 1247 } while(0) | |
| 1248 | |
| 1249 switch(df->BytesPerPixel) { | |
| 1250 case 2: | |
| 1251 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1252 || df->Bmask == 0x07e0) | |
| 1253 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1254 else | |
| 1255 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1256 break; | |
| 1257 case 4: | |
| 1258 RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1259 break; | |
| 1260 } | |
| 1261 } | |
| 1262 | |
| 1263 done: | |
| 1264 /* Unlock the destination if necessary */ | |
|
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1265 if ( SDL_MUSTLOCK(dst) ) { |
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1266 SDL_UnlockSurface(dst); |
| 0 | 1267 } |
| 1268 return 0; | |
| 1269 } | |
| 1270 | |
| 1271 /* | |
| 1272 * Auxiliary functions: | |
| 1273 * The encoding functions take 32bpp rgb + a, and | |
| 1274 * return the number of bytes copied to the destination. | |
| 1275 * The decoding functions copy to 32bpp rgb + a, and | |
| 1276 * return the number of bytes copied from the source. | |
| 1277 * These are only used in the encoder and un-RLE code and are therefore not | |
| 1278 * highly optimised. | |
| 1279 */ | |
| 1280 | |
| 1281 /* encode 32bpp rgb + a into 16bpp rgb, losing alpha */ | |
| 1282 static int copy_opaque_16(void *dst, Uint32 *src, int n, | |
| 1283 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1284 { | |
| 1285 int i; | |
| 1286 Uint16 *d = dst; | |
| 1287 for(i = 0; i < n; i++) { | |
| 1288 unsigned r, g, b; | |
| 1289 RGB_FROM_PIXEL(*src, sfmt, r, g, b); | |
| 1290 PIXEL_FROM_RGB(*d, dfmt, r, g, b); | |
| 1291 src++; | |
| 1292 d++; | |
| 1293 } | |
| 1294 return n * 2; | |
| 1295 } | |
| 1296 | |
| 1297 /* decode opaque pixels from 16bpp to 32bpp rgb + a */ | |
| 1298 static int uncopy_opaque_16(Uint32 *dst, void *src, int n, | |
| 1299 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1300 { | |
| 1301 int i; | |
| 1302 Uint16 *s = src; | |
| 1303 unsigned alpha = dfmt->Amask ? 255 : 0; | |
| 1304 for(i = 0; i < n; i++) { | |
| 1305 unsigned r, g, b; | |
| 1306 RGB_FROM_PIXEL(*s, sfmt, r, g, b); | |
| 1307 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha); | |
| 1308 s++; | |
| 1309 dst++; | |
| 1310 } | |
| 1311 return n * 2; | |
| 1312 } | |
| 1313 | |
| 1314 | |
| 1315 | |
| 1316 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */ | |
| 1317 static int copy_transl_565(void *dst, Uint32 *src, int n, | |
| 1318 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1319 { | |
| 1320 int i; | |
| 1321 Uint32 *d = dst; | |
| 1322 for(i = 0; i < n; i++) { | |
| 1323 unsigned r, g, b, a; | |
| 1324 Uint16 pix; | |
| 1325 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1326 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1327 *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0); | |
| 1328 src++; | |
| 1329 d++; | |
| 1330 } | |
| 1331 return n * 4; | |
| 1332 } | |
| 1333 | |
| 1334 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */ | |
| 1335 static int copy_transl_555(void *dst, Uint32 *src, int n, | |
| 1336 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1337 { | |
| 1338 int i; | |
| 1339 Uint32 *d = dst; | |
| 1340 for(i = 0; i < n; i++) { | |
| 1341 unsigned r, g, b, a; | |
| 1342 Uint16 pix; | |
| 1343 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1344 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1345 *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0); | |
| 1346 src++; | |
| 1347 d++; | |
| 1348 } | |
| 1349 return n * 4; | |
| 1350 } | |
| 1351 | |
| 1352 /* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */ | |
| 1353 static int uncopy_transl_16(Uint32 *dst, void *src, int n, | |
| 1354 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1355 { | |
| 1356 int i; | |
| 1357 Uint32 *s = src; | |
| 1358 for(i = 0; i < n; i++) { | |
| 1359 unsigned r, g, b, a; | |
| 1360 Uint32 pix = *s++; | |
| 1361 a = (pix & 0x3e0) >> 2; | |
| 1362 pix = (pix & ~0x3e0) | pix >> 16; | |
| 1363 RGB_FROM_PIXEL(pix, sfmt, r, g, b); | |
| 1364 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1365 dst++; | |
| 1366 } | |
| 1367 return n * 4; | |
| 1368 } | |
| 1369 | |
| 1370 /* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1371 static int copy_32(void *dst, Uint32 *src, int n, | |
| 1372 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1373 { | |
| 1374 int i; | |
| 1375 Uint32 *d = dst; | |
| 1376 for(i = 0; i < n; i++) { | |
| 1377 unsigned r, g, b, a; | |
| 1378 Uint32 pixel; | |
| 1379 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1380 PIXEL_FROM_RGB(pixel, dfmt, r, g, b); | |
| 1381 *d++ = pixel | a << 24; | |
| 1382 src++; | |
| 1383 } | |
| 1384 return n * 4; | |
| 1385 } | |
| 1386 | |
| 1387 /* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1388 static int uncopy_32(Uint32 *dst, void *src, int n, | |
| 1389 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1390 { | |
| 1391 int i; | |
| 1392 Uint32 *s = src; | |
| 1393 for(i = 0; i < n; i++) { | |
| 1394 unsigned r, g, b, a; | |
| 1395 Uint32 pixel = *s++; | |
| 1396 RGB_FROM_PIXEL(pixel, sfmt, r, g, b); | |
| 1397 a = pixel >> 24; | |
| 1398 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1399 dst++; | |
| 1400 } | |
| 1401 return n * 4; | |
| 1402 } | |
| 1403 | |
| 1404 #define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255) | |
| 1405 | |
| 1406 #define ISTRANSL(pixel, fmt) \ | |
| 1407 ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U) | |
| 1408 | |
| 1409 /* convert surface to be quickly alpha-blittable onto dest, if possible */ | |
| 1410 static int RLEAlphaSurface(SDL_Surface *surface) | |
| 1411 { | |
| 1412 SDL_Surface *dest; | |
| 1413 SDL_PixelFormat *df; | |
| 1414 int maxsize = 0; | |
| 1415 int max_opaque_run; | |
| 1416 int max_transl_run = 65535; | |
| 1417 unsigned masksum; | |
| 1418 Uint8 *rlebuf, *dst; | |
| 1419 int (*copy_opaque)(void *, Uint32 *, int, | |
| 1420 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1421 int (*copy_transl)(void *, Uint32 *, int, | |
| 1422 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1423 | |
| 1424 dest = surface->map->dst; | |
| 1425 if(!dest) | |
| 1426 return -1; | |
| 1427 df = dest->format; | |
| 1428 if(surface->format->BitsPerPixel != 32) | |
| 1429 return -1; /* only 32bpp source supported */ | |
| 1430 | |
| 1431 /* find out whether the destination is one we support, | |
| 1432 and determine the max size of the encoded result */ | |
| 1433 masksum = df->Rmask | df->Gmask | df->Bmask; | |
| 1434 switch(df->BytesPerPixel) { | |
| 1435 case 2: | |
| 1436 /* 16bpp: only support 565 and 555 formats */ | |
| 1437 switch(masksum) { | |
| 1438 case 0xffff: | |
| 1439 if(df->Gmask == 0x07e0 | |
| 1440 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) { | |
| 1441 copy_opaque = copy_opaque_16; | |
| 1442 copy_transl = copy_transl_565; | |
| 1443 } else | |
| 1444 return -1; | |
| 1445 break; | |
| 1446 case 0x7fff: | |
| 1447 if(df->Gmask == 0x03e0 | |
| 1448 || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) { | |
| 1449 copy_opaque = copy_opaque_16; | |
| 1450 copy_transl = copy_transl_555; | |
| 1451 } else | |
| 1452 return -1; | |
| 1453 break; | |
| 1454 default: | |
| 1455 return -1; | |
| 1456 } | |
| 1457 max_opaque_run = 255; /* runs stored as bytes */ | |
| 1458 | |
| 1459 /* worst case is alternating opaque and translucent pixels, | |
| 1460 with room for alignment padding between lines */ | |
| 1461 maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2; | |
| 1462 break; | |
| 1463 case 4: | |
| 1464 if(masksum != 0x00ffffff) | |
| 1465 return -1; /* requires unused high byte */ | |
| 1466 copy_opaque = copy_32; | |
| 1467 copy_transl = copy_32; | |
| 1468 max_opaque_run = 255; /* runs stored as short ints */ | |
| 1469 | |
| 1470 /* worst case is alternating opaque and translucent pixels */ | |
| 1471 maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4; | |
| 1472 break; | |
| 1473 default: | |
| 1474 return -1; /* anything else unsupported right now */ | |
| 1475 } | |
| 1476 | |
| 1477 maxsize += sizeof(RLEDestFormat); | |
| 1478 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1479 if(!rlebuf) { | |
| 1480 SDL_OutOfMemory(); | |
| 1481 return -1; | |
| 1482 } | |
| 1483 { | |
| 1484 /* save the destination format so we can undo the encoding later */ | |
| 1485 RLEDestFormat *r = (RLEDestFormat *)rlebuf; | |
| 1486 r->BytesPerPixel = df->BytesPerPixel; | |
| 1487 r->Rloss = df->Rloss; | |
| 1488 r->Gloss = df->Gloss; | |
| 1489 r->Bloss = df->Bloss; | |
| 1490 r->Rshift = df->Rshift; | |
| 1491 r->Gshift = df->Gshift; | |
| 1492 r->Bshift = df->Bshift; | |
| 1493 r->Ashift = df->Ashift; | |
| 1494 r->Rmask = df->Rmask; | |
| 1495 r->Gmask = df->Gmask; | |
| 1496 r->Bmask = df->Bmask; | |
| 1497 r->Amask = df->Amask; | |
| 1498 } | |
| 1499 dst = rlebuf + sizeof(RLEDestFormat); | |
| 1500 | |
| 1501 /* Do the actual encoding */ | |
| 1502 { | |
| 1503 int x, y; | |
| 1504 int h = surface->h, w = surface->w; | |
| 1505 SDL_PixelFormat *sf = surface->format; | |
|
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1506 Uint32 *src = (Uint32 *)surface->pixels; |
| 0 | 1507 Uint8 *lastline = dst; /* end of last non-blank line */ |
| 1508 | |
| 1509 /* opaque counts are 8 or 16 bits, depending on target depth */ | |
| 1510 #define ADD_OPAQUE_COUNTS(n, m) \ | |
| 1511 if(df->BytesPerPixel == 4) { \ | |
| 1512 ((Uint16 *)dst)[0] = n; \ | |
| 1513 ((Uint16 *)dst)[1] = m; \ | |
| 1514 dst += 4; \ | |
| 1515 } else { \ | |
| 1516 dst[0] = n; \ | |
| 1517 dst[1] = m; \ | |
| 1518 dst += 2; \ | |
| 1519 } | |
| 1520 | |
| 1521 /* translucent counts are always 16 bit */ | |
| 1522 #define ADD_TRANSL_COUNTS(n, m) \ | |
| 1523 (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4) | |
| 1524 | |
| 1525 for(y = 0; y < h; y++) { | |
| 1526 int runstart, skipstart; | |
| 1527 int blankline = 0; | |
| 1528 /* First encode all opaque pixels of a scan line */ | |
| 1529 x = 0; | |
| 1530 do { | |
| 1531 int run, skip, len; | |
| 1532 skipstart = x; | |
| 1533 while(x < w && !ISOPAQUE(src[x], sf)) | |
| 1534 x++; | |
| 1535 runstart = x; | |
| 1536 while(x < w && ISOPAQUE(src[x], sf)) | |
| 1537 x++; | |
| 1538 skip = runstart - skipstart; | |
| 1539 if(skip == w) | |
| 1540 blankline = 1; | |
| 1541 run = x - runstart; | |
| 1542 while(skip > max_opaque_run) { | |
| 1543 ADD_OPAQUE_COUNTS(max_opaque_run, 0); | |
| 1544 skip -= max_opaque_run; | |
| 1545 } | |
| 1546 len = MIN(run, max_opaque_run); | |
| 1547 ADD_OPAQUE_COUNTS(skip, len); | |
| 1548 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1549 runstart += len; | |
| 1550 run -= len; | |
| 1551 while(run) { | |
| 1552 len = MIN(run, max_opaque_run); | |
| 1553 ADD_OPAQUE_COUNTS(0, len); | |
| 1554 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1555 runstart += len; | |
| 1556 run -= len; | |
| 1557 } | |
| 1558 } while(x < w); | |
| 1559 | |
| 1560 /* Make sure the next output address is 32-bit aligned */ | |
| 1561 dst += (unsigned long)dst & 2; | |
| 1562 | |
| 1563 /* Next, encode all translucent pixels of the same scan line */ | |
| 1564 x = 0; | |
| 1565 do { | |
| 1566 int run, skip, len; | |
| 1567 skipstart = x; | |
| 1568 while(x < w && !ISTRANSL(src[x], sf)) | |
| 1569 x++; | |
| 1570 runstart = x; | |
| 1571 while(x < w && ISTRANSL(src[x], sf)) | |
| 1572 x++; | |
| 1573 skip = runstart - skipstart; | |
| 1574 blankline &= (skip == w); | |
| 1575 run = x - runstart; | |
| 1576 while(skip > max_transl_run) { | |
| 1577 ADD_TRANSL_COUNTS(max_transl_run, 0); | |
| 1578 skip -= max_transl_run; | |
| 1579 } | |
| 1580 len = MIN(run, max_transl_run); | |
| 1581 ADD_TRANSL_COUNTS(skip, len); | |
| 1582 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1583 runstart += len; | |
| 1584 run -= len; | |
| 1585 while(run) { | |
| 1586 len = MIN(run, max_transl_run); | |
| 1587 ADD_TRANSL_COUNTS(0, len); | |
| 1588 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1589 runstart += len; | |
| 1590 run -= len; | |
| 1591 } | |
| 1592 if(!blankline) | |
| 1593 lastline = dst; | |
| 1594 } while(x < w); | |
| 1595 | |
| 1596 src += surface->pitch >> 2; | |
| 1597 } | |
| 1598 dst = lastline; /* back up past trailing blank lines */ | |
| 1599 ADD_OPAQUE_COUNTS(0, 0); | |
| 1600 } | |
| 1601 | |
| 1602 #undef ADD_OPAQUE_COUNTS | |
| 1603 #undef ADD_TRANSL_COUNTS | |
| 1604 | |
| 1605 /* Now that we have it encoded, release the original pixels */ | |
| 1606 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1607 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1608 free( surface->pixels ); | |
| 1609 surface->pixels = NULL; | |
| 1610 } | |
| 1611 | |
| 1612 /* realloc the buffer to release unused memory */ | |
| 1613 { | |
| 1614 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1615 if(!p) | |
| 1616 p = rlebuf; | |
| 1617 surface->map->sw_data->aux_data = p; | |
| 1618 } | |
| 1619 | |
| 1620 return 0; | |
| 1621 } | |
| 1622 | |
| 1623 static Uint32 getpix_8(Uint8 *srcbuf) | |
| 1624 { | |
| 1625 return *srcbuf; | |
| 1626 } | |
| 1627 | |
| 1628 static Uint32 getpix_16(Uint8 *srcbuf) | |
| 1629 { | |
| 1630 return *(Uint16 *)srcbuf; | |
| 1631 } | |
| 1632 | |
| 1633 static Uint32 getpix_24(Uint8 *srcbuf) | |
| 1634 { | |
| 1635 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) | |
| 1636 return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16); | |
| 1637 else | |
| 1638 return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2]; | |
| 1639 } | |
| 1640 | |
| 1641 static Uint32 getpix_32(Uint8 *srcbuf) | |
| 1642 { | |
| 1643 return *(Uint32 *)srcbuf; | |
| 1644 } | |
| 1645 | |
| 1646 typedef Uint32 (*getpix_func)(Uint8 *); | |
| 1647 | |
| 1648 static getpix_func getpixes[4] = { | |
| 1649 getpix_8, getpix_16, getpix_24, getpix_32 | |
| 1650 }; | |
| 1651 | |
| 1652 static int RLEColorkeySurface(SDL_Surface *surface) | |
| 1653 { | |
| 1654 Uint8 *rlebuf, *dst; | |
| 1655 int maxn; | |
| 1656 int y; | |
| 1657 Uint8 *srcbuf, *curbuf, *lastline; | |
| 1658 int maxsize = 0; | |
| 1659 int skip, run; | |
| 1660 int bpp = surface->format->BytesPerPixel; | |
| 1661 getpix_func getpix; | |
| 1662 Uint32 ckey, rgbmask; | |
| 1663 int w, h; | |
| 1664 | |
| 1665 /* calculate the worst case size for the compressed surface */ | |
| 1666 switch(bpp) { | |
| 1667 case 1: | |
| 1668 /* worst case is alternating opaque and transparent pixels, | |
| 1669 starting with an opaque pixel */ | |
| 1670 maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2; | |
| 1671 break; | |
| 1672 case 2: | |
| 1673 case 3: | |
| 1674 /* worst case is solid runs, at most 255 pixels wide */ | |
| 1675 maxsize = surface->h * (2 * (surface->w / 255 + 1) | |
| 1676 + surface->w * bpp) + 2; | |
| 1677 break; | |
| 1678 case 4: | |
| 1679 /* worst case is solid runs, at most 65535 pixels wide */ | |
| 1680 maxsize = surface->h * (4 * (surface->w / 65535 + 1) | |
| 1681 + surface->w * 4) + 4; | |
| 1682 break; | |
| 1683 } | |
| 1684 | |
| 1685 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1686 if ( rlebuf == NULL ) { | |
| 1687 SDL_OutOfMemory(); | |
| 1688 return(-1); | |
| 1689 } | |
| 1690 | |
| 1691 /* Set up the conversion */ | |
|
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1692 srcbuf = (Uint8 *)surface->pixels; |
| 0 | 1693 curbuf = srcbuf; |
| 1694 maxn = bpp == 4 ? 65535 : 255; | |
| 1695 skip = run = 0; | |
| 1696 dst = rlebuf; | |
| 1697 rgbmask = ~surface->format->Amask; | |
| 1698 ckey = surface->format->colorkey & rgbmask; | |
| 1699 lastline = dst; | |
| 1700 getpix = getpixes[bpp - 1]; | |
| 1701 w = surface->w; | |
| 1702 h = surface->h; | |
| 1703 | |
| 1704 #define ADD_COUNTS(n, m) \ | |
| 1705 if(bpp == 4) { \ | |
| 1706 ((Uint16 *)dst)[0] = n; \ | |
| 1707 ((Uint16 *)dst)[1] = m; \ | |
| 1708 dst += 4; \ | |
| 1709 } else { \ | |
| 1710 dst[0] = n; \ | |
| 1711 dst[1] = m; \ | |
| 1712 dst += 2; \ | |
| 1713 } | |
| 1714 | |
| 1715 for(y = 0; y < h; y++) { | |
| 1716 int x = 0; | |
| 1717 int blankline = 0; | |
| 1718 do { | |
| 1719 int run, skip, len; | |
| 1720 int runstart; | |
| 1721 int skipstart = x; | |
| 1722 | |
| 1723 /* find run of transparent, then opaque pixels */ | |
| 1724 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey) | |
| 1725 x++; | |
| 1726 runstart = x; | |
| 1727 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey) | |
| 1728 x++; | |
| 1729 skip = runstart - skipstart; | |
| 1730 if(skip == w) | |
| 1731 blankline = 1; | |
| 1732 run = x - runstart; | |
| 1733 | |
| 1734 /* encode segment */ | |
| 1735 while(skip > maxn) { | |
| 1736 ADD_COUNTS(maxn, 0); | |
| 1737 skip -= maxn; | |
| 1738 } | |
| 1739 len = MIN(run, maxn); | |
| 1740 ADD_COUNTS(skip, len); | |
| 1741 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1742 dst += len * bpp; | |
| 1743 run -= len; | |
| 1744 runstart += len; | |
| 1745 while(run) { | |
| 1746 len = MIN(run, maxn); | |
| 1747 ADD_COUNTS(0, len); | |
| 1748 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1749 dst += len * bpp; | |
| 1750 runstart += len; | |
| 1751 run -= len; | |
| 1752 } | |
| 1753 if(!blankline) | |
| 1754 lastline = dst; | |
| 1755 } while(x < w); | |
| 1756 | |
| 1757 srcbuf += surface->pitch; | |
| 1758 } | |
| 1759 dst = lastline; /* back up bast trailing blank lines */ | |
| 1760 ADD_COUNTS(0, 0); | |
| 1761 | |
| 1762 #undef ADD_COUNTS | |
| 1763 | |
| 1764 /* Now that we have it encoded, release the original pixels */ | |
| 1765 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1766 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1767 free( surface->pixels ); | |
| 1768 surface->pixels = NULL; | |
| 1769 } | |
| 1770 | |
| 1771 /* realloc the buffer to release unused memory */ | |
| 1772 { | |
| 1773 /* If realloc returns NULL, the original block is left intact */ | |
| 1774 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1775 if(!p) | |
| 1776 p = rlebuf; | |
| 1777 surface->map->sw_data->aux_data = p; | |
| 1778 } | |
| 1779 | |
| 1780 return(0); | |
| 1781 } | |
| 1782 | |
| 1783 int SDL_RLESurface(SDL_Surface *surface) | |
| 1784 { | |
| 1785 int retcode; | |
| 1786 | |
| 1787 /* Clear any previous RLE conversion */ | |
| 1788 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1789 SDL_UnRLESurface(surface, 1); | |
| 1790 } | |
| 1791 | |
| 1792 /* We don't support RLE encoding of bitmaps */ | |
| 1793 if ( surface->format->BitsPerPixel < 8 ) { | |
| 1794 return(-1); | |
| 1795 } | |
| 1796 | |
| 1797 /* Lock the surface if it's in hardware */ | |
|
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1798 if ( SDL_MUSTLOCK(surface) ) { |
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1799 if ( SDL_LockSurface(surface) < 0 ) { |
| 0 | 1800 return(-1); |
| 1801 } | |
| 1802 } | |
| 1803 | |
| 1804 /* Encode */ | |
| 1805 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1806 retcode = RLEColorkeySurface(surface); | |
| 1807 } else { | |
| 1808 if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 1809 && surface->format->Amask != 0) | |
| 1810 retcode = RLEAlphaSurface(surface); | |
| 1811 else | |
| 1812 retcode = -1; /* no RLE for per-surface alpha sans ckey */ | |
| 1813 } | |
| 1814 | |
| 1815 /* Unlock the surface if it's in hardware */ | |
|
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|
1816 if ( SDL_MUSTLOCK(surface) ) { |
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1817 SDL_UnlockSurface(surface); |
| 0 | 1818 } |
| 1819 | |
| 1820 if(retcode < 0) | |
| 1821 return -1; | |
| 1822 | |
| 1823 /* The surface is now accelerated */ | |
| 1824 surface->flags |= SDL_RLEACCEL; | |
| 1825 | |
| 1826 return(0); | |
| 1827 } | |
| 1828 | |
| 1829 /* | |
| 1830 * Un-RLE a surface with pixel alpha | |
| 1831 * This may not give back exactly the image before RLE-encoding; all | |
| 1832 * completely transparent pixels will be lost, and colour and alpha depth | |
| 1833 * may have been reduced (when encoding for 16bpp targets). | |
| 1834 */ | |
|
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|
1835 static SDL_bool UnRLEAlpha(SDL_Surface *surface) |
| 0 | 1836 { |
| 1837 Uint8 *srcbuf; | |
| 1838 Uint32 *dst; | |
| 1839 SDL_PixelFormat *sf = surface->format; | |
| 1840 RLEDestFormat *df = surface->map->sw_data->aux_data; | |
| 1841 int (*uncopy_opaque)(Uint32 *, void *, int, | |
| 1842 RLEDestFormat *, SDL_PixelFormat *); | |
| 1843 int (*uncopy_transl)(Uint32 *, void *, int, | |
| 1844 RLEDestFormat *, SDL_PixelFormat *); | |
| 1845 int w = surface->w; | |
| 1846 int bpp = df->BytesPerPixel; | |
| 1847 | |
| 1848 if(bpp == 2) { | |
| 1849 uncopy_opaque = uncopy_opaque_16; | |
| 1850 uncopy_transl = uncopy_transl_16; | |
| 1851 } else { | |
| 1852 uncopy_opaque = uncopy_transl = uncopy_32; | |
| 1853 } | |
| 1854 | |
| 1855 surface->pixels = malloc(surface->h * surface->pitch); | |
|
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|
1856 if ( !surface->pixels ) { |
|
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|
1857 return(SDL_FALSE); |
|
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1858 } |
| 0 | 1859 /* fill background with transparent pixels */ |
| 1860 memset(surface->pixels, 0, surface->h * surface->pitch); | |
| 1861 | |
| 1862 dst = surface->pixels; | |
| 1863 srcbuf = (Uint8 *)(df + 1); | |
| 1864 for(;;) { | |
| 1865 /* copy opaque pixels */ | |
| 1866 int ofs = 0; | |
| 1867 do { | |
| 1868 unsigned run; | |
| 1869 if(bpp == 2) { | |
| 1870 ofs += srcbuf[0]; | |
| 1871 run = srcbuf[1]; | |
| 1872 srcbuf += 2; | |
| 1873 } else { | |
| 1874 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1875 run = ((Uint16 *)srcbuf)[1]; | |
| 1876 srcbuf += 4; | |
| 1877 } | |
| 1878 if(run) { | |
| 1879 srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf); | |
| 1880 ofs += run; | |
| 1881 } else if(!ofs) | |
|
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|
1882 return(SDL_TRUE); |
| 0 | 1883 } while(ofs < w); |
| 1884 | |
| 1885 /* skip padding if needed */ | |
| 1886 if(bpp == 2) | |
| 1887 srcbuf += (unsigned long)srcbuf & 2; | |
| 1888 | |
| 1889 /* copy translucent pixels */ | |
| 1890 ofs = 0; | |
| 1891 do { | |
| 1892 unsigned run; | |
| 1893 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1894 run = ((Uint16 *)srcbuf)[1]; | |
| 1895 srcbuf += 4; | |
| 1896 if(run) { | |
| 1897 srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf); | |
| 1898 ofs += run; | |
| 1899 } | |
| 1900 } while(ofs < w); | |
| 1901 dst += surface->pitch >> 2; | |
| 1902 } | |
|
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|
1903 /* Make the compiler happy */ |
|
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1904 return(SDL_TRUE); |
| 0 | 1905 } |
| 1906 | |
| 1907 void SDL_UnRLESurface(SDL_Surface *surface, int recode) | |
| 1908 { | |
| 1909 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1910 surface->flags &= ~SDL_RLEACCEL; | |
| 1911 | |
| 1912 if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1913 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1914 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1915 SDL_Rect full; | |
| 1916 unsigned alpha_flag; | |
| 1917 | |
| 1918 /* re-create the original surface */ | |
| 1919 surface->pixels = malloc(surface->h * surface->pitch); | |
|
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1920 if ( !surface->pixels ) { |
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1921 /* Oh crap... */ |
|
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1922 surface->flags |= SDL_RLEACCEL; |
|
cdea7cbc3e23
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1923 return; |
|
cdea7cbc3e23
Date: Wed, 28 Jul 2004 14:56:57 +0800
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1924 } |
| 0 | 1925 |
| 1926 /* fill it with the background colour */ | |
| 1927 SDL_FillRect(surface, NULL, surface->format->colorkey); | |
| 1928 | |
| 1929 /* now render the encoded surface */ | |
| 1930 full.x = full.y = 0; | |
| 1931 full.w = surface->w; | |
| 1932 full.h = surface->h; | |
| 1933 alpha_flag = surface->flags & SDL_SRCALPHA; | |
| 1934 surface->flags &= ~SDL_SRCALPHA; /* opaque blit */ | |
| 1935 SDL_RLEBlit(surface, &full, surface, &full); | |
| 1936 surface->flags |= alpha_flag; | |
|
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1937 } else { |
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1938 if ( !UnRLEAlpha(surface) ) { |
|
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1939 /* Oh crap... */ |
|
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1940 surface->flags |= SDL_RLEACCEL; |
|
cdea7cbc3e23
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1941 return; |
|
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|
1942 } |
|
cdea7cbc3e23
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|
1943 } |
| 0 | 1944 } |
| 1945 | |
| 1946 if ( surface->map && surface->map->sw_data->aux_data ) { | |
| 1947 free(surface->map->sw_data->aux_data); | |
| 1948 surface->map->sw_data->aux_data = NULL; | |
| 1949 } | |
| 1950 } | |
| 1951 } | |
| 1952 | |
| 1953 |