Mercurial > sdl-ios-xcode
annotate src/video/SDL_RLEaccel.c @ 769:b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Jan 2004 16:49:27 +0000 |
| parents | 22dbf364c017 |
| children | 2bacec7930b1 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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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(__GNUC__) && defined(USE_ASMBLIT) |
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106 #include "mmx.h" |
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107 #include "SDL_cpuinfo.h" |
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108 #endif |
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109 |
| 0 | 110 #ifndef MAX |
| 111 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 112 #endif | |
| 113 #ifndef MIN | |
| 114 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 115 #endif | |
| 116 | |
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117 #define PIXEL_COPY(to, from, len, bpp) \ |
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118 do { \ |
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119 if(bpp == 4) { \ |
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120 SDL_memcpy4(to, from, (unsigned)(len)); \ |
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121 } else { \ |
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122 SDL_memcpy(to, from, (unsigned)(len) * (bpp)); \ |
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123 } \ |
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124 } while(0) |
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125 |
| 0 | 126 /* |
| 127 * Various colorkey blit methods, for opaque and per-surface alpha | |
| 128 */ | |
| 129 | |
| 130 #define OPAQUE_BLIT(to, from, length, bpp, alpha) \ | |
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131 PIXEL_COPY(to, from, length, bpp) |
| 0 | 132 |
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133 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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134 |
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135 #define ALPHA_BLIT32_888MMX(to, from, length, bpp, alpha) \ |
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136 do { \ |
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137 Uint32 *srcp = (Uint32 *)(from); \ |
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138 Uint32 *dstp = (Uint32 *)(to); \ |
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139 int i = 0x00FF00FF; \ |
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140 movd_m2r(*(&i), mm3); \ |
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141 punpckldq_r2r(mm3, mm3); \ |
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142 i = 0xFF000000; \ |
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143 movd_m2r(*(&i), mm7); \ |
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144 punpckldq_r2r(mm7, mm7); \ |
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145 i = alpha | alpha << 16; \ |
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146 movd_m2r(*(&i), mm4); \ |
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147 punpckldq_r2r(mm4, mm4); \ |
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148 pcmpeqd_r2r(mm5,mm5); /* set mm5 to "1" */ \ |
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149 pxor_r2r(mm7, mm5); /* make clear alpha mask */ \ |
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150 i = length; \ |
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151 if(i & 1) { \ |
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152 movd_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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153 punpcklbw_r2r(mm1, mm1); \ |
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154 pand_r2r(mm3, mm1); \ |
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155 movd_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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156 punpcklbw_r2r(mm2, mm2); \ |
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157 pand_r2r(mm3, mm2); \ |
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158 psubw_r2r(mm2, mm1); \ |
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159 pmullw_r2r(mm4, mm1); \ |
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160 psrlw_i2r(8, mm1); \ |
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161 paddw_r2r(mm1, mm2); \ |
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162 pand_r2r(mm3, mm2); \ |
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163 packuswb_r2r(mm2, mm2); \ |
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164 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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165 movd_r2m(mm2, *dstp); \ |
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166 ++srcp; \ |
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167 ++dstp; \ |
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168 i--; \ |
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169 } \ |
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170 for(; i > 0; --i) { \ |
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171 movq_m2r((*srcp), mm0); \ |
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172 movq_r2r(mm0, mm1); \ |
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173 punpcklbw_r2r(mm0, mm0); \ |
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174 movq_m2r((*dstp), mm2); \ |
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175 punpckhbw_r2r(mm1, mm1); \ |
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176 movq_r2r(mm2, mm6); \ |
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177 pand_r2r(mm3, mm0); \ |
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178 punpcklbw_r2r(mm2, mm2); \ |
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179 pand_r2r(mm3, mm1); \ |
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180 punpckhbw_r2r(mm6, mm6); \ |
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181 pand_r2r(mm3, mm2); \ |
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182 psubw_r2r(mm2, mm0); \ |
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183 pmullw_r2r(mm4, mm0); \ |
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184 pand_r2r(mm3, mm6); \ |
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185 psubw_r2r(mm6, mm1); \ |
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186 pmullw_r2r(mm4, mm1); \ |
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187 psrlw_i2r(8, mm0); \ |
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188 paddw_r2r(mm0, mm2); \ |
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189 psrlw_i2r(8, mm1); \ |
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190 paddw_r2r(mm1, mm6); \ |
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191 pand_r2r(mm3, mm2); \ |
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192 pand_r2r(mm3, mm6); \ |
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193 packuswb_r2r(mm2, mm2); \ |
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194 packuswb_r2r(mm6, mm6); \ |
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195 psrlq_i2r(32, mm2); \ |
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196 psllq_i2r(32, mm6); \ |
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197 por_r2r(mm6, mm2); \ |
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198 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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199 movq_r2m(mm2, *dstp); \ |
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200 srcp += 2; \ |
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201 dstp += 2; \ |
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202 i--; \ |
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203 } \ |
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204 emms(); \ |
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205 } while(0) |
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206 |
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207 #define ALPHA_BLIT16_565MMX(to, from, length, bpp, alpha) \ |
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208 do { \ |
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209 int i, n = 0; \ |
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210 Uint16 *srcp = (Uint16 *)(from); \ |
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211 Uint16 *dstp = (Uint16 *)(to); \ |
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212 Uint32 ALPHA = 0xF800; \ |
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213 movd_m2r(*(&ALPHA), mm1); \ |
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214 punpcklwd_r2r(mm1, mm1); \ |
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215 punpcklwd_r2r(mm1, mm1); \ |
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216 ALPHA = 0x07E0; \ |
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217 movd_m2r(*(&ALPHA), mm4); \ |
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218 punpcklwd_r2r(mm4, mm4); \ |
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219 punpcklwd_r2r(mm4, mm4); \ |
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220 ALPHA = 0x001F; \ |
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221 movd_m2r(*(&ALPHA), mm7); \ |
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222 punpcklwd_r2r(mm7, mm7); \ |
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223 punpcklwd_r2r(mm7, mm7); \ |
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224 alpha &= ~(1+2+4); \ |
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225 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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226 movd_m2r(*(&i), mm0); \ |
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227 punpckldq_r2r(mm0, mm0); \ |
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228 ALPHA = alpha >> 3; \ |
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229 i = ((int)(length) & 3); \ |
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230 for(; i > 0; --i) { \ |
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231 Uint32 s = *srcp++; \ |
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232 Uint32 d = *dstp; \ |
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233 s = (s | s << 16) & 0x07e0f81f; \ |
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234 d = (d | d << 16) & 0x07e0f81f; \ |
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235 d += (s - d) * ALPHA >> 5; \ |
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236 d &= 0x07e0f81f; \ |
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237 *dstp++ = d | d >> 16; \ |
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238 n++; \ |
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239 } \ |
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240 i = (int)(length) - n; \ |
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241 for(; i > 0; --i) { \ |
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242 movq_m2r((*dstp), mm3); \ |
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243 movq_m2r((*srcp), mm2); \ |
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244 movq_r2r(mm2, mm5); \ |
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245 pand_r2r(mm1 , mm5); \ |
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246 psrlq_i2r(11, mm5); \ |
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247 movq_r2r(mm3, mm6); \ |
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248 pand_r2r(mm1 , mm6); \ |
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249 psrlq_i2r(11, mm6); \ |
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250 psubw_r2r(mm6, mm5); \ |
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251 pmullw_r2r(mm0, mm5); \ |
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252 psrlw_i2r(8, mm5); \ |
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253 paddw_r2r(mm5, mm6); \ |
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254 psllq_i2r(11, mm6); \ |
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255 pand_r2r(mm1, mm6); \ |
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256 movq_r2r(mm4, mm5); \ |
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257 por_r2r(mm7, mm5); \ |
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258 pand_r2r(mm5, mm3); \ |
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259 por_r2r(mm6, mm3); \ |
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260 movq_r2r(mm2, mm5); \ |
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261 pand_r2r(mm4 , mm5); \ |
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262 psrlq_i2r(5, mm5); \ |
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263 movq_r2r(mm3, mm6); \ |
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264 pand_r2r(mm4 , mm6); \ |
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265 psrlq_i2r(5, mm6); \ |
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266 psubw_r2r(mm6, mm5); \ |
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267 pmullw_r2r(mm0, mm5); \ |
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268 psrlw_i2r(8, mm5); \ |
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269 paddw_r2r(mm5, mm6); \ |
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270 psllq_i2r(5, mm6); \ |
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271 pand_r2r(mm4, mm6); \ |
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272 movq_r2r(mm1, mm5); \ |
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273 por_r2r(mm7, mm5); \ |
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274 pand_r2r(mm5, mm3); \ |
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275 por_r2r(mm6, mm3); \ |
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276 movq_r2r(mm2, mm5); \ |
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277 pand_r2r(mm7 , mm5); \ |
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278 movq_r2r(mm3, mm6); \ |
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279 pand_r2r(mm7 , mm6); \ |
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280 psubw_r2r(mm6, mm5); \ |
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281 pmullw_r2r(mm0, mm5); \ |
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282 psrlw_i2r(8, mm5); \ |
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283 paddw_r2r(mm5, mm6); \ |
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284 pand_r2r(mm7, mm6); \ |
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285 movq_r2r(mm1, mm5); \ |
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286 por_r2r(mm4, mm5); \ |
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287 pand_r2r(mm5, mm3); \ |
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288 por_r2r(mm6, mm3); \ |
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289 movq_r2m(mm3, *dstp); \ |
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290 srcp += 4; \ |
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291 dstp += 4; \ |
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292 i -= 3; \ |
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293 } \ |
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294 emms(); \ |
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295 } while(0) |
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296 |
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297 #define ALPHA_BLIT16_555MMX(to, from, length, bpp, alpha) \ |
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298 do { \ |
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299 int i, n = 0; \ |
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300 Uint16 *srcp = (Uint16 *)(from); \ |
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301 Uint16 *dstp = (Uint16 *)(to); \ |
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302 Uint32 ALPHA = 0x7C00; \ |
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303 movd_m2r(*(&ALPHA), mm1); \ |
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304 punpcklwd_r2r(mm1, mm1); \ |
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305 punpcklwd_r2r(mm1, mm1); \ |
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306 ALPHA = 0x03E0; \ |
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307 movd_m2r(*(&ALPHA), mm4); \ |
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308 punpcklwd_r2r(mm4, mm4); \ |
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309 punpcklwd_r2r(mm4, mm4); \ |
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310 ALPHA = 0x001F; \ |
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311 movd_m2r(*(&ALPHA), mm7); \ |
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312 punpcklwd_r2r(mm7, mm7); \ |
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313 punpcklwd_r2r(mm7, mm7); \ |
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314 alpha &= ~(1+2+4); \ |
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315 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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316 movd_m2r(*(&i), mm0); \ |
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317 punpckldq_r2r(mm0, mm0); \ |
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318 i = ((int)(length) & 3); \ |
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319 ALPHA = alpha >> 3; \ |
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320 for(; i > 0; --i) { \ |
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321 Uint32 s = *srcp++; \ |
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322 Uint32 d = *dstp; \ |
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323 s = (s | s << 16) & 0x03e07c1f; \ |
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324 d = (d | d << 16) & 0x03e07c1f; \ |
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325 d += (s - d) * ALPHA >> 5; \ |
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326 d &= 0x03e07c1f; \ |
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327 *dstp++ = d | d >> 16; \ |
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328 n++; \ |
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329 } \ |
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330 i = (int)(length) - n; \ |
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331 for(; i > 0; --i) { \ |
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332 movq_m2r((*dstp), mm3); \ |
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333 movq_m2r((*srcp), mm2); \ |
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334 movq_r2r(mm2, mm5); \ |
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335 pand_r2r(mm1 , mm5); \ |
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336 psrlq_i2r(10, mm5); \ |
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337 movq_r2r(mm3, mm6); \ |
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338 pand_r2r(mm1 , mm6); \ |
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339 psrlq_i2r(10, mm6); \ |
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340 psubw_r2r(mm6, mm5); \ |
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341 pmullw_r2r(mm0, mm5); \ |
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342 psrlw_i2r(8, mm5); \ |
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343 paddw_r2r(mm5, mm6); \ |
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344 psllq_i2r(10, mm6); \ |
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345 pand_r2r(mm1, mm6); \ |
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346 movq_r2r(mm4, mm5); \ |
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347 por_r2r(mm7, mm5); \ |
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348 pand_r2r(mm5, mm3); \ |
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349 por_r2r(mm6, mm3); \ |
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350 movq_r2r(mm2, mm5); \ |
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351 pand_r2r(mm4 , mm5); \ |
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352 psrlq_i2r(5, mm5); \ |
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353 movq_r2r(mm3, mm6); \ |
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354 pand_r2r(mm4 , mm6); \ |
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355 psrlq_i2r(5, mm6); \ |
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356 psubw_r2r(mm6, mm5); \ |
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357 pmullw_r2r(mm0, mm5); \ |
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358 psrlw_i2r(8, mm5); \ |
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359 paddw_r2r(mm5, mm6); \ |
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360 psllq_i2r(5, mm6); \ |
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361 pand_r2r(mm4, mm6); \ |
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362 movq_r2r(mm1, mm5); \ |
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363 por_r2r(mm7, mm5); \ |
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364 pand_r2r(mm5, mm3); \ |
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365 por_r2r(mm6, mm3); \ |
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366 movq_r2r(mm2, mm5); \ |
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367 pand_r2r(mm7 , mm5); \ |
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368 movq_r2r(mm3, mm6); \ |
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369 pand_r2r(mm7 , mm6); \ |
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370 psubw_r2r(mm6, mm5); \ |
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371 pmullw_r2r(mm0, mm5); \ |
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372 psrlw_i2r(8, mm5); \ |
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373 paddw_r2r(mm5, mm6); \ |
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374 pand_r2r(mm7, mm6); \ |
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375 movq_r2r(mm1, mm5); \ |
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376 por_r2r(mm4, mm5); \ |
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377 pand_r2r(mm5, mm3); \ |
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378 por_r2r(mm6, mm3); \ |
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379 movq_r2m(mm3, *dstp); \ |
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380 srcp += 4; \ |
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381 dstp += 4; \ |
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382 i -= 3; \ |
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383 } \ |
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384 emms(); \ |
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385 } while(0) |
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386 |
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387 #endif |
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388 |
| 0 | 389 /* |
| 390 * For 32bpp pixels on the form 0x00rrggbb: | |
| 391 * If we treat the middle component separately, we can process the two | |
| 392 * remaining in parallel. This is safe to do because of the gap to the left | |
| 393 * of each component, so the bits from the multiplication don't collide. | |
| 394 * This can be used for any RGB permutation of course. | |
| 395 */ | |
| 396 #define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \ | |
| 397 do { \ | |
| 398 int i; \ | |
| 399 Uint32 *src = (Uint32 *)(from); \ | |
| 400 Uint32 *dst = (Uint32 *)(to); \ | |
| 401 for(i = 0; i < (int)(length); i++) { \ | |
| 402 Uint32 s = *src++; \ | |
| 403 Uint32 d = *dst; \ | |
| 404 Uint32 s1 = s & 0xff00ff; \ | |
| 405 Uint32 d1 = d & 0xff00ff; \ | |
| 406 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 407 s &= 0xff00; \ | |
| 408 d &= 0xff00; \ | |
| 409 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 410 *dst++ = d1 | d; \ | |
| 411 } \ | |
| 412 } while(0) | |
| 413 | |
| 414 /* | |
| 415 * For 16bpp pixels we can go a step further: put the middle component | |
| 416 * in the high 16 bits of a 32 bit word, and process all three RGB | |
| 417 * components at the same time. Since the smallest gap is here just | |
| 418 * 5 bits, we have to scale alpha down to 5 bits as well. | |
| 419 */ | |
| 420 #define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \ | |
| 421 do { \ | |
| 422 int i; \ | |
| 423 Uint16 *src = (Uint16 *)(from); \ | |
| 424 Uint16 *dst = (Uint16 *)(to); \ | |
|
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425 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 426 for(i = 0; i < (int)(length); i++) { \ |
| 427 Uint32 s = *src++; \ | |
| 428 Uint32 d = *dst; \ | |
| 429 s = (s | s << 16) & 0x07e0f81f; \ | |
| 430 d = (d | d << 16) & 0x07e0f81f; \ | |
|
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431 d += (s - d) * ALPHA >> 5; \ |
| 0 | 432 d &= 0x07e0f81f; \ |
| 433 *dst++ = d | d >> 16; \ | |
| 434 } \ | |
| 435 } while(0) | |
| 436 | |
| 437 #define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \ | |
| 438 do { \ | |
| 439 int i; \ | |
| 440 Uint16 *src = (Uint16 *)(from); \ | |
| 441 Uint16 *dst = (Uint16 *)(to); \ | |
|
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442 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 443 for(i = 0; i < (int)(length); i++) { \ |
| 444 Uint32 s = *src++; \ | |
| 445 Uint32 d = *dst; \ | |
| 446 s = (s | s << 16) & 0x03e07c1f; \ | |
| 447 d = (d | d << 16) & 0x03e07c1f; \ | |
|
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448 d += (s - d) * ALPHA >> 5; \ |
| 0 | 449 d &= 0x03e07c1f; \ |
| 450 *dst++ = d | d >> 16; \ | |
| 451 } \ | |
| 452 } while(0) | |
| 453 | |
| 454 /* | |
| 455 * The general slow catch-all function, for remaining depths and formats | |
| 456 */ | |
| 457 #define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \ | |
| 458 do { \ | |
| 459 int i; \ | |
| 460 Uint8 *src = from; \ | |
| 461 Uint8 *dst = to; \ | |
| 462 for(i = 0; i < (int)(length); i++) { \ | |
| 463 Uint32 s, d; \ | |
| 464 unsigned rs, gs, bs, rd, gd, bd; \ | |
| 465 switch(bpp) { \ | |
| 466 case 2: \ | |
| 467 s = *(Uint16 *)src; \ | |
| 468 d = *(Uint16 *)dst; \ | |
| 469 break; \ | |
| 470 case 3: \ | |
| 471 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 472 s = (src[0] << 16) | (src[1] << 8) | src[2]; \ | |
| 473 d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \ | |
| 474 } else { \ | |
| 475 s = (src[2] << 16) | (src[1] << 8) | src[0]; \ | |
| 476 d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \ | |
| 477 } \ | |
| 478 break; \ | |
| 479 case 4: \ | |
| 480 s = *(Uint32 *)src; \ | |
| 481 d = *(Uint32 *)dst; \ | |
| 482 break; \ | |
| 483 } \ | |
| 484 RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \ | |
| 485 RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \ | |
| 486 rd += (rs - rd) * alpha >> 8; \ | |
| 487 gd += (gs - gd) * alpha >> 8; \ | |
| 488 bd += (bs - bd) * alpha >> 8; \ | |
| 489 PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \ | |
| 490 switch(bpp) { \ | |
| 491 case 2: \ | |
| 492 *(Uint16 *)dst = d; \ | |
| 493 break; \ | |
| 494 case 3: \ | |
| 495 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 496 dst[0] = d >> 16; \ | |
| 497 dst[1] = d >> 8; \ | |
| 498 dst[2] = d; \ | |
| 499 } else { \ | |
| 500 dst[0] = d; \ | |
| 501 dst[1] = d >> 8; \ | |
| 502 dst[2] = d >> 16; \ | |
| 503 } \ | |
| 504 break; \ | |
| 505 case 4: \ | |
| 506 *(Uint32 *)dst = d; \ | |
| 507 break; \ | |
| 508 } \ | |
| 509 src += bpp; \ | |
| 510 dst += bpp; \ | |
| 511 } \ | |
| 512 } while(0) | |
| 513 | |
|
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514 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
| 0 | 515 |
|
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516 #define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha) \ |
|
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517 do { \ |
|
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518 Uint32 *srcp = (Uint32 *)(from); \ |
|
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519 Uint32 *dstp = (Uint32 *)(to); \ |
|
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520 int i = 0x00fefefe; \ |
|
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521 movd_m2r(*(&i), mm4); \ |
|
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522 punpckldq_r2r(mm4, mm4); \ |
|
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523 i = 0x00010101; \ |
|
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524 movd_m2r(*(&i), mm3); \ |
|
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525 punpckldq_r2r(mm3, mm3); \ |
|
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526 i = (int)(length); \ |
|
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527 if( i & 1 ) { \ |
|
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528 Uint32 s = *srcp++; \ |
|
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529 Uint32 d = *dstp; \ |
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530 *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ |
|
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531 + (s & d & 0x00010101); \ |
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532 i--; \ |
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533 } \ |
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534 for(; i > 0; --i) { \ |
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535 movq_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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536 movq_r2r(mm2, mm6); /* dst -> mm6 */ \ |
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537 movq_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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538 movq_r2r(mm1, mm5); /* src -> mm5 */ \ |
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539 pand_r2r(mm4, mm6); /* dst & 0x00fefefe -> mm6 */ \ |
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540 pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */ \ |
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541 paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */ \ |
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542 psrld_i2r(1, mm5); \ |
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543 pand_r2r(mm1, mm2); /* s & d -> mm2 */ \ |
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544 pand_r2r(mm3, mm2); /* s & d & 0x00010101 -> mm2 */ \ |
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545 paddd_r2r(mm5, mm2); \ |
|
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546 movq_r2m(mm2, (*dstp)); \ |
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547 dstp += 2; \ |
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548 srcp += 2; \ |
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549 i--; \ |
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550 } \ |
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551 emms(); \ |
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552 } while(0) |
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553 |
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554 #endif |
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555 |
| 0 | 556 /* |
| 557 * Special case: 50% alpha (alpha=128) | |
| 558 * This is treated specially because it can be optimized very well, and | |
| 559 * since it is good for many cases of semi-translucency. | |
| 560 * The theory is to do all three components at the same time: | |
| 561 * First zero the lowest bit of each component, which gives us room to | |
| 562 * add them. Then shift right and add the sum of the lowest bits. | |
| 563 */ | |
| 564 #define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \ | |
| 565 do { \ | |
| 566 int i; \ | |
| 567 Uint32 *src = (Uint32 *)(from); \ | |
| 568 Uint32 *dst = (Uint32 *)(to); \ | |
| 569 for(i = 0; i < (int)(length); i++) { \ | |
| 570 Uint32 s = *src++; \ | |
| 571 Uint32 d = *dst; \ | |
| 572 *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ | |
| 573 + (s & d & 0x00010101); \ | |
| 574 } \ | |
| 575 } while(0) | |
| 576 | |
| 577 /* | |
| 578 * For 16bpp, we can actually blend two pixels in parallel, if we take | |
| 579 * care to shift before we add, not after. | |
| 580 */ | |
| 581 | |
| 582 /* helper: blend a single 16 bit pixel at 50% */ | |
| 583 #define BLEND16_50(dst, src, mask) \ | |
| 584 do { \ | |
| 585 Uint32 s = *src++; \ | |
| 586 Uint32 d = *dst; \ | |
| 587 *dst++ = (((s & mask) + (d & mask)) >> 1) \ | |
| 588 + (s & d & (~mask & 0xffff)); \ | |
| 589 } while(0) | |
| 590 | |
| 591 /* basic 16bpp blender. mask is the pixels to keep when adding. */ | |
| 592 #define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \ | |
| 593 do { \ | |
| 594 unsigned n = (length); \ | |
| 595 Uint16 *src = (Uint16 *)(from); \ | |
| 596 Uint16 *dst = (Uint16 *)(to); \ | |
| 597 if(((unsigned long)src ^ (unsigned long)dst) & 3) { \ | |
| 598 /* source and destination not in phase, blit one by one */ \ | |
| 599 while(n--) \ | |
| 600 BLEND16_50(dst, src, mask); \ | |
| 601 } else { \ | |
| 602 if((unsigned long)src & 3) { \ | |
| 603 /* first odd pixel */ \ | |
| 604 BLEND16_50(dst, src, mask); \ | |
| 605 n--; \ | |
| 606 } \ | |
| 607 for(; n > 1; n -= 2) { \ | |
| 608 Uint32 s = *(Uint32 *)src; \ | |
| 609 Uint32 d = *(Uint32 *)dst; \ | |
| 610 *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \ | |
| 611 + ((d & (mask | mask << 16)) >> 1) \ | |
| 612 + (s & d & (~(mask | mask << 16))); \ | |
| 613 src += 2; \ | |
| 614 dst += 2; \ | |
| 615 } \ | |
| 616 if(n) \ | |
| 617 BLEND16_50(dst, src, mask); /* last odd pixel */ \ | |
| 618 } \ | |
| 619 } while(0) | |
| 620 | |
| 621 #define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \ | |
| 622 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de) | |
| 623 | |
| 624 #define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \ | |
| 625 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde) | |
| 626 | |
|
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627 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
| 0 | 628 |
| 629 #define CHOOSE_BLIT(blitter, alpha, fmt) \ | |
| 630 do { \ | |
| 631 if(alpha == 255) { \ | |
| 632 switch(fmt->BytesPerPixel) { \ | |
| 633 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ | |
| 634 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ | |
| 635 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ | |
| 636 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ | |
| 637 } \ | |
| 638 } else { \ | |
| 639 switch(fmt->BytesPerPixel) { \ | |
| 640 case 1: \ | |
| 641 /* No 8bpp alpha blitting */ \ | |
| 642 break; \ | |
| 643 \ | |
| 644 case 2: \ | |
| 645 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ | |
| 646 case 0xffff: \ | |
| 647 if(fmt->Gmask == 0x07e0 \ | |
| 648 || fmt->Rmask == 0x07e0 \ | |
| 649 || fmt->Bmask == 0x07e0) { \ | |
| 650 if(alpha == 128) \ | |
| 651 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ | |
| 652 else { \ | |
|
739
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653 if(SDL_HasMMX()) \ |
|
689
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654 blitter(2, Uint8, ALPHA_BLIT16_565MMX); \ |
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655 else \ |
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656 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
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657 } \ |
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658 } else \ |
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659 goto general16; \ |
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660 break; \ |
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661 \ |
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662 case 0x7fff: \ |
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663 if(fmt->Gmask == 0x03e0 \ |
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664 || fmt->Rmask == 0x03e0 \ |
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665 || fmt->Bmask == 0x03e0) { \ |
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666 if(alpha == 128) \ |
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667 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ |
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668 else { \ |
|
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Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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669 if(SDL_HasMMX()) \ |
|
689
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670 blitter(2, Uint8, ALPHA_BLIT16_555MMX); \ |
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671 else \ |
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672 blitter(2, Uint8, ALPHA_BLIT16_555); \ |
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673 } \ |
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674 break; \ |
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675 } \ |
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676 /* fallthrough */ \ |
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677 \ |
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678 default: \ |
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679 general16: \ |
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680 blitter(2, Uint8, ALPHA_BLIT_ANY); \ |
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681 } \ |
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682 break; \ |
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683 \ |
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684 case 3: \ |
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685 blitter(3, Uint8, ALPHA_BLIT_ANY); \ |
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686 break; \ |
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687 \ |
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688 case 4: \ |
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689 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ |
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690 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ |
|
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691 || fmt->Bmask == 0xff00)) { \ |
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692 if(alpha == 128) \ |
|
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693 { \ |
|
739
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694 if(SDL_HasMMX()) \ |
|
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695 blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\ |
|
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696 else \ |
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697 blitter(4, Uint16, ALPHA_BLIT32_888_50);\ |
|
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698 } \ |
|
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699 else \ |
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700 { \ |
|
739
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701 if(SDL_HasMMX()) \ |
|
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702 blitter(4, Uint16, ALPHA_BLIT32_888MMX);\ |
|
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703 else \ |
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704 blitter(4, Uint16, ALPHA_BLIT32_888); \ |
|
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705 } \ |
|
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706 } else \ |
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707 blitter(4, Uint16, ALPHA_BLIT_ANY); \ |
|
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708 break; \ |
|
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709 } \ |
|
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710 } \ |
|
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711 } while(0) |
|
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712 |
|
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713 #else |
|
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714 |
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715 #define CHOOSE_BLIT(blitter, alpha, fmt) \ |
|
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716 do { \ |
|
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717 if(alpha == 255) { \ |
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718 switch(fmt->BytesPerPixel) { \ |
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719 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ |
|
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720 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ |
|
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721 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ |
|
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722 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ |
|
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723 } \ |
|
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724 } else { \ |
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725 switch(fmt->BytesPerPixel) { \ |
|
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726 case 1: \ |
|
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727 /* No 8bpp alpha blitting */ \ |
|
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728 break; \ |
|
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729 \ |
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730 case 2: \ |
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731 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ |
|
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732 case 0xffff: \ |
|
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733 if(fmt->Gmask == 0x07e0 \ |
|
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734 || fmt->Rmask == 0x07e0 \ |
|
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735 || fmt->Bmask == 0x07e0) { \ |
|
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736 if(alpha == 128) \ |
|
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737 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ |
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738 else { \ |
| 0 | 739 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
| 740 } \ | |
| 741 } else \ | |
| 742 goto general16; \ | |
| 743 break; \ | |
| 744 \ | |
| 745 case 0x7fff: \ | |
| 746 if(fmt->Gmask == 0x03e0 \ | |
| 747 || fmt->Rmask == 0x03e0 \ | |
| 748 || fmt->Bmask == 0x03e0) { \ | |
| 749 if(alpha == 128) \ | |
| 750 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ | |
| 751 else { \ | |
| 752 blitter(2, Uint8, ALPHA_BLIT16_555); \ | |
| 753 } \ | |
| 754 break; \ | |
| 755 } \ | |
| 756 /* fallthrough */ \ | |
| 757 \ | |
| 758 default: \ | |
| 759 general16: \ | |
| 760 blitter(2, Uint8, ALPHA_BLIT_ANY); \ | |
| 761 } \ | |
| 762 break; \ | |
| 763 \ | |
| 764 case 3: \ | |
| 765 blitter(3, Uint8, ALPHA_BLIT_ANY); \ | |
| 766 break; \ | |
| 767 \ | |
| 768 case 4: \ | |
| 769 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ | |
| 770 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ | |
| 771 || fmt->Bmask == 0xff00)) { \ | |
| 772 if(alpha == 128) \ | |
| 773 blitter(4, Uint16, ALPHA_BLIT32_888_50); \ | |
| 774 else \ | |
| 775 blitter(4, Uint16, ALPHA_BLIT32_888); \ | |
| 776 } else \ | |
| 777 blitter(4, Uint16, ALPHA_BLIT_ANY); \ | |
| 778 break; \ | |
| 779 } \ | |
| 780 } \ | |
| 781 } while(0) | |
| 782 | |
|
689
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783 #endif |
| 0 | 784 |
| 785 /* | |
| 786 * This takes care of the case when the surface is clipped on the left and/or | |
| 787 * right. Top clipping has already been taken care of. | |
| 788 */ | |
| 789 static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 790 Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha) | |
| 791 { | |
| 792 SDL_PixelFormat *fmt = dst->format; | |
| 793 | |
| 794 #define RLECLIPBLIT(bpp, Type, do_blit) \ | |
| 795 do { \ | |
| 796 int linecount = srcrect->h; \ | |
| 797 int ofs = 0; \ | |
| 798 int left = srcrect->x; \ | |
| 799 int right = left + srcrect->w; \ | |
| 800 dstbuf -= left * bpp; \ | |
| 801 for(;;) { \ | |
| 802 int run; \ | |
| 803 ofs += *(Type *)srcbuf; \ | |
| 804 run = ((Type *)srcbuf)[1]; \ | |
| 805 srcbuf += 2 * sizeof(Type); \ | |
| 806 if(run) { \ | |
| 807 /* clip to left and right borders */ \ | |
| 808 if(ofs < right) { \ | |
| 809 int start = 0; \ | |
| 810 int len = run; \ | |
| 811 int startcol; \ | |
| 812 if(left - ofs > 0) { \ | |
| 813 start = left - ofs; \ | |
| 814 len -= start; \ | |
| 815 if(len <= 0) \ | |
| 816 goto nocopy ## bpp ## do_blit; \ | |
| 817 } \ | |
| 818 startcol = ofs + start; \ | |
| 819 if(len > right - startcol) \ | |
| 820 len = right - startcol; \ | |
| 821 do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \ | |
| 822 len, bpp, alpha); \ | |
| 823 } \ | |
| 824 nocopy ## bpp ## do_blit: \ | |
| 825 srcbuf += run * bpp; \ | |
| 826 ofs += run; \ | |
| 827 } else if(!ofs) \ | |
| 828 break; \ | |
| 829 if(ofs == w) { \ | |
| 830 ofs = 0; \ | |
| 831 dstbuf += dst->pitch; \ | |
| 832 if(!--linecount) \ | |
| 833 break; \ | |
| 834 } \ | |
| 835 } \ | |
| 836 } while(0) | |
| 837 | |
| 838 CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); | |
| 839 | |
| 840 #undef RLECLIPBLIT | |
| 841 | |
| 842 } | |
| 843 | |
| 844 | |
| 845 /* blit a colorkeyed RLE surface */ | |
| 846 int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 847 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 848 { | |
| 849 Uint8 *dstbuf; | |
| 850 Uint8 *srcbuf; | |
| 851 int x, y; | |
| 852 int w = src->w; | |
| 853 unsigned alpha; | |
| 854 | |
| 855 /* Lock the destination if necessary */ | |
|
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856 if ( SDL_MUSTLOCK(dst) ) { |
|
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857 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 858 return(-1); |
| 859 } | |
| 860 } | |
| 861 | |
| 862 /* Set up the source and destination pointers */ | |
| 863 x = dstrect->x; | |
| 864 y = dstrect->y; | |
|
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865 dstbuf = (Uint8 *)dst->pixels |
| 0 | 866 + y * dst->pitch + x * src->format->BytesPerPixel; |
| 867 srcbuf = (Uint8 *)src->map->sw_data->aux_data; | |
| 868 | |
| 869 { | |
| 870 /* skip lines at the top if neccessary */ | |
| 871 int vskip = srcrect->y; | |
| 872 int ofs = 0; | |
| 873 if(vskip) { | |
| 874 | |
| 875 #define RLESKIP(bpp, Type) \ | |
| 876 for(;;) { \ | |
| 877 int run; \ | |
| 878 ofs += *(Type *)srcbuf; \ | |
| 879 run = ((Type *)srcbuf)[1]; \ | |
| 880 srcbuf += sizeof(Type) * 2; \ | |
| 881 if(run) { \ | |
| 882 srcbuf += run * bpp; \ | |
| 883 ofs += run; \ | |
| 884 } else if(!ofs) \ | |
| 885 goto done; \ | |
| 886 if(ofs == w) { \ | |
| 887 ofs = 0; \ | |
| 888 if(!--vskip) \ | |
| 889 break; \ | |
| 890 } \ | |
| 891 } | |
| 892 | |
| 893 switch(src->format->BytesPerPixel) { | |
| 894 case 1: RLESKIP(1, Uint8); break; | |
| 895 case 2: RLESKIP(2, Uint8); break; | |
| 896 case 3: RLESKIP(3, Uint8); break; | |
| 897 case 4: RLESKIP(4, Uint16); break; | |
| 898 } | |
| 899 | |
| 900 #undef RLESKIP | |
| 901 | |
| 902 } | |
| 903 } | |
| 904 | |
| 905 alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 906 ? src->format->alpha : 255; | |
| 907 /* if left or right edge clipping needed, call clip blit */ | |
| 908 if ( srcrect->x || srcrect->w != src->w ) { | |
| 909 RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); | |
| 910 } else { | |
| 911 SDL_PixelFormat *fmt = src->format; | |
| 912 | |
| 913 #define RLEBLIT(bpp, Type, do_blit) \ | |
| 914 do { \ | |
| 915 int linecount = srcrect->h; \ | |
| 916 int ofs = 0; \ | |
| 917 for(;;) { \ | |
| 918 unsigned run; \ | |
| 919 ofs += *(Type *)srcbuf; \ | |
| 920 run = ((Type *)srcbuf)[1]; \ | |
| 921 srcbuf += 2 * sizeof(Type); \ | |
| 922 if(run) { \ | |
| 923 do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \ | |
| 924 srcbuf += run * bpp; \ | |
| 925 ofs += run; \ | |
| 926 } else if(!ofs) \ | |
| 927 break; \ | |
| 928 if(ofs == w) { \ | |
| 929 ofs = 0; \ | |
| 930 dstbuf += dst->pitch; \ | |
| 931 if(!--linecount) \ | |
| 932 break; \ | |
| 933 } \ | |
| 934 } \ | |
| 935 } while(0) | |
| 936 | |
| 937 CHOOSE_BLIT(RLEBLIT, alpha, fmt); | |
| 938 | |
| 939 #undef RLEBLIT | |
| 940 } | |
| 941 | |
| 942 done: | |
| 943 /* Unlock the destination if necessary */ | |
|
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944 if ( SDL_MUSTLOCK(dst) ) { |
|
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945 SDL_UnlockSurface(dst); |
| 0 | 946 } |
| 947 return(0); | |
| 948 } | |
| 949 | |
| 950 #undef OPAQUE_BLIT | |
| 951 | |
| 952 /* | |
| 953 * Per-pixel blitting macros for translucent pixels: | |
| 954 * These use the same techniques as the per-surface blitting macros | |
| 955 */ | |
| 956 | |
| 957 /* | |
| 958 * For 32bpp pixels, we have made sure the alpha is stored in the top | |
| 959 * 8 bits, so proceed as usual | |
| 960 */ | |
| 961 #define BLIT_TRANSL_888(src, dst) \ | |
| 962 do { \ | |
| 963 Uint32 s = src; \ | |
| 964 Uint32 d = dst; \ | |
| 965 unsigned alpha = s >> 24; \ | |
| 966 Uint32 s1 = s & 0xff00ff; \ | |
| 967 Uint32 d1 = d & 0xff00ff; \ | |
| 968 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 969 s &= 0xff00; \ | |
| 970 d &= 0xff00; \ | |
| 971 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 972 dst = d1 | d; \ | |
| 973 } while(0) | |
| 974 | |
| 975 /* | |
| 976 * For 16bpp pixels, we have stored the 5 most significant alpha bits in | |
| 977 * bits 5-10. As before, we can process all 3 RGB components at the same time. | |
| 978 */ | |
| 979 #define BLIT_TRANSL_565(src, dst) \ | |
| 980 do { \ | |
| 981 Uint32 s = src; \ | |
| 982 Uint32 d = dst; \ | |
| 983 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 984 s &= 0x07e0f81f; \ | |
| 985 d = (d | d << 16) & 0x07e0f81f; \ | |
| 986 d += (s - d) * alpha >> 5; \ | |
| 987 d &= 0x07e0f81f; \ | |
| 988 dst = d | d >> 16; \ | |
| 989 } while(0) | |
| 990 | |
| 991 #define BLIT_TRANSL_555(src, dst) \ | |
| 992 do { \ | |
| 993 Uint32 s = src; \ | |
| 994 Uint32 d = dst; \ | |
| 995 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 996 s &= 0x03e07c1f; \ | |
| 997 d = (d | d << 16) & 0x03e07c1f; \ | |
| 998 d += (s - d) * alpha >> 5; \ | |
| 999 d &= 0x03e07c1f; \ | |
| 1000 dst = d | d >> 16; \ | |
| 1001 } while(0) | |
| 1002 | |
| 1003 /* used to save the destination format in the encoding. Designed to be | |
| 1004 macro-compatible with SDL_PixelFormat but without the unneeded fields */ | |
| 1005 typedef struct { | |
| 1006 Uint8 BytesPerPixel; | |
| 1007 Uint8 Rloss; | |
| 1008 Uint8 Gloss; | |
| 1009 Uint8 Bloss; | |
| 1010 Uint8 Rshift; | |
| 1011 Uint8 Gshift; | |
| 1012 Uint8 Bshift; | |
| 1013 Uint8 Ashift; | |
| 1014 Uint32 Rmask; | |
| 1015 Uint32 Gmask; | |
| 1016 Uint32 Bmask; | |
| 1017 Uint32 Amask; | |
| 1018 } RLEDestFormat; | |
| 1019 | |
| 1020 /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ | |
| 1021 static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 1022 Uint8 *dstbuf, SDL_Rect *srcrect) | |
| 1023 { | |
| 1024 SDL_PixelFormat *df = dst->format; | |
| 1025 /* | |
| 1026 * clipped blitter: Ptype is the destination pixel type, | |
| 1027 * Ctype the translucent count type, and do_blend the macro | |
| 1028 * to blend one pixel. | |
| 1029 */ | |
| 1030 #define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \ | |
| 1031 do { \ | |
| 1032 int linecount = srcrect->h; \ | |
| 1033 int left = srcrect->x; \ | |
| 1034 int right = left + srcrect->w; \ | |
| 1035 dstbuf -= left * sizeof(Ptype); \ | |
| 1036 do { \ | |
| 1037 int ofs = 0; \ | |
| 1038 /* blit opaque pixels on one line */ \ | |
| 1039 do { \ | |
| 1040 unsigned run; \ | |
| 1041 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1042 run = ((Ctype *)srcbuf)[1]; \ | |
| 1043 srcbuf += 2 * sizeof(Ctype); \ | |
| 1044 if(run) { \ | |
| 1045 /* clip to left and right borders */ \ | |
| 1046 int cofs = ofs; \ | |
| 1047 int crun = run; \ | |
| 1048 if(left - cofs > 0) { \ | |
| 1049 crun -= left - cofs; \ | |
| 1050 cofs = left; \ | |
| 1051 } \ | |
| 1052 if(crun > right - cofs) \ | |
| 1053 crun = right - cofs; \ | |
| 1054 if(crun > 0) \ | |
|
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|
1055 PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \ |
| 0 | 1056 srcbuf + (cofs - ofs) * sizeof(Ptype), \ |
|
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|
1057 (unsigned)crun, sizeof(Ptype)); \ |
| 0 | 1058 srcbuf += run * sizeof(Ptype); \ |
| 1059 ofs += run; \ | |
| 1060 } else if(!ofs) \ | |
| 1061 return; \ | |
| 1062 } while(ofs < w); \ | |
| 1063 /* skip padding if necessary */ \ | |
| 1064 if(sizeof(Ptype) == 2) \ | |
| 1065 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1066 /* blit translucent pixels on the same line */ \ | |
| 1067 ofs = 0; \ | |
| 1068 do { \ | |
| 1069 unsigned run; \ | |
| 1070 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1071 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1072 srcbuf += 4; \ | |
| 1073 if(run) { \ | |
| 1074 /* clip to left and right borders */ \ | |
| 1075 int cofs = ofs; \ | |
| 1076 int crun = run; \ | |
| 1077 if(left - cofs > 0) { \ | |
| 1078 crun -= left - cofs; \ | |
| 1079 cofs = left; \ | |
| 1080 } \ | |
| 1081 if(crun > right - cofs) \ | |
| 1082 crun = right - cofs; \ | |
| 1083 if(crun > 0) { \ | |
| 1084 Ptype *dst = (Ptype *)dstbuf + cofs; \ | |
| 1085 Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \ | |
| 1086 int i; \ | |
| 1087 for(i = 0; i < crun; i++) \ | |
| 1088 do_blend(src[i], dst[i]); \ | |
| 1089 } \ | |
| 1090 srcbuf += run * 4; \ | |
| 1091 ofs += run; \ | |
| 1092 } \ | |
| 1093 } while(ofs < w); \ | |
| 1094 dstbuf += dst->pitch; \ | |
| 1095 } while(--linecount); \ | |
| 1096 } while(0) | |
| 1097 | |
| 1098 switch(df->BytesPerPixel) { | |
| 1099 case 2: | |
| 1100 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1101 || df->Bmask == 0x07e0) | |
| 1102 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1103 else | |
| 1104 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1105 break; | |
| 1106 case 4: | |
| 1107 RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1108 break; | |
| 1109 } | |
| 1110 } | |
| 1111 | |
| 1112 /* blit a pixel-alpha RLE surface */ | |
| 1113 int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 1114 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 1115 { | |
| 1116 int x, y; | |
| 1117 int w = src->w; | |
| 1118 Uint8 *srcbuf, *dstbuf; | |
| 1119 SDL_PixelFormat *df = dst->format; | |
| 1120 | |
| 1121 /* Lock the destination if necessary */ | |
|
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1122 if ( SDL_MUSTLOCK(dst) ) { |
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1123 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 1124 return -1; |
| 1125 } | |
| 1126 } | |
| 1127 | |
| 1128 x = dstrect->x; | |
| 1129 y = dstrect->y; | |
|
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1130 dstbuf = (Uint8 *)dst->pixels |
| 0 | 1131 + y * dst->pitch + x * df->BytesPerPixel; |
| 1132 srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat); | |
| 1133 | |
| 1134 { | |
| 1135 /* skip lines at the top if necessary */ | |
| 1136 int vskip = srcrect->y; | |
| 1137 if(vskip) { | |
| 1138 int ofs; | |
| 1139 if(df->BytesPerPixel == 2) { | |
| 1140 /* the 16/32 interleaved format */ | |
| 1141 do { | |
| 1142 /* skip opaque line */ | |
| 1143 ofs = 0; | |
| 1144 do { | |
| 1145 int run; | |
| 1146 ofs += srcbuf[0]; | |
| 1147 run = srcbuf[1]; | |
| 1148 srcbuf += 2; | |
| 1149 if(run) { | |
| 1150 srcbuf += 2 * run; | |
| 1151 ofs += run; | |
| 1152 } else if(!ofs) | |
| 1153 goto done; | |
| 1154 } while(ofs < w); | |
| 1155 | |
| 1156 /* skip padding */ | |
| 1157 srcbuf += (unsigned long)srcbuf & 2; | |
| 1158 | |
| 1159 /* skip translucent line */ | |
| 1160 ofs = 0; | |
| 1161 do { | |
| 1162 int run; | |
| 1163 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1164 run = ((Uint16 *)srcbuf)[1]; | |
| 1165 srcbuf += 4 * (run + 1); | |
| 1166 ofs += run; | |
| 1167 } while(ofs < w); | |
| 1168 } while(--vskip); | |
| 1169 } else { | |
| 1170 /* the 32/32 interleaved format */ | |
| 1171 vskip <<= 1; /* opaque and translucent have same format */ | |
| 1172 do { | |
| 1173 ofs = 0; | |
| 1174 do { | |
| 1175 int run; | |
| 1176 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1177 run = ((Uint16 *)srcbuf)[1]; | |
| 1178 srcbuf += 4; | |
| 1179 if(run) { | |
| 1180 srcbuf += 4 * run; | |
| 1181 ofs += run; | |
| 1182 } else if(!ofs) | |
| 1183 goto done; | |
| 1184 } while(ofs < w); | |
| 1185 } while(--vskip); | |
| 1186 } | |
| 1187 } | |
| 1188 } | |
| 1189 | |
| 1190 /* if left or right edge clipping needed, call clip blit */ | |
| 1191 if(srcrect->x || srcrect->w != src->w) { | |
| 1192 RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect); | |
| 1193 } else { | |
| 1194 | |
| 1195 /* | |
| 1196 * non-clipped blitter. Ptype is the destination pixel type, | |
| 1197 * Ctype the translucent count type, and do_blend the | |
| 1198 * macro to blend one pixel. | |
| 1199 */ | |
| 1200 #define RLEALPHABLIT(Ptype, Ctype, do_blend) \ | |
| 1201 do { \ | |
| 1202 int linecount = srcrect->h; \ | |
| 1203 do { \ | |
| 1204 int ofs = 0; \ | |
| 1205 /* blit opaque pixels on one line */ \ | |
| 1206 do { \ | |
| 1207 unsigned run; \ | |
| 1208 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1209 run = ((Ctype *)srcbuf)[1]; \ | |
| 1210 srcbuf += 2 * sizeof(Ctype); \ | |
| 1211 if(run) { \ | |
|
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1212 PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \ |
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1213 run, sizeof(Ptype)); \ |
| 0 | 1214 srcbuf += run * sizeof(Ptype); \ |
| 1215 ofs += run; \ | |
| 1216 } else if(!ofs) \ | |
| 1217 goto done; \ | |
| 1218 } while(ofs < w); \ | |
| 1219 /* skip padding if necessary */ \ | |
| 1220 if(sizeof(Ptype) == 2) \ | |
| 1221 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1222 /* blit translucent pixels on the same line */ \ | |
| 1223 ofs = 0; \ | |
| 1224 do { \ | |
| 1225 unsigned run; \ | |
| 1226 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1227 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1228 srcbuf += 4; \ | |
| 1229 if(run) { \ | |
| 1230 Ptype *dst = (Ptype *)dstbuf + ofs; \ | |
| 1231 unsigned i; \ | |
| 1232 for(i = 0; i < run; i++) { \ | |
| 1233 Uint32 src = *(Uint32 *)srcbuf; \ | |
| 1234 do_blend(src, *dst); \ | |
| 1235 srcbuf += 4; \ | |
| 1236 dst++; \ | |
| 1237 } \ | |
| 1238 ofs += run; \ | |
| 1239 } \ | |
| 1240 } while(ofs < w); \ | |
| 1241 dstbuf += dst->pitch; \ | |
| 1242 } while(--linecount); \ | |
| 1243 } while(0) | |
| 1244 | |
| 1245 switch(df->BytesPerPixel) { | |
| 1246 case 2: | |
| 1247 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1248 || df->Bmask == 0x07e0) | |
| 1249 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1250 else | |
| 1251 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1252 break; | |
| 1253 case 4: | |
| 1254 RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1255 break; | |
| 1256 } | |
| 1257 } | |
| 1258 | |
| 1259 done: | |
| 1260 /* Unlock the destination if necessary */ | |
|
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1261 if ( SDL_MUSTLOCK(dst) ) { |
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1262 SDL_UnlockSurface(dst); |
| 0 | 1263 } |
| 1264 return 0; | |
| 1265 } | |
| 1266 | |
| 1267 /* | |
| 1268 * Auxiliary functions: | |
| 1269 * The encoding functions take 32bpp rgb + a, and | |
| 1270 * return the number of bytes copied to the destination. | |
| 1271 * The decoding functions copy to 32bpp rgb + a, and | |
| 1272 * return the number of bytes copied from the source. | |
| 1273 * These are only used in the encoder and un-RLE code and are therefore not | |
| 1274 * highly optimised. | |
| 1275 */ | |
| 1276 | |
| 1277 /* encode 32bpp rgb + a into 16bpp rgb, losing alpha */ | |
| 1278 static int copy_opaque_16(void *dst, Uint32 *src, int n, | |
| 1279 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1280 { | |
| 1281 int i; | |
| 1282 Uint16 *d = dst; | |
| 1283 for(i = 0; i < n; i++) { | |
| 1284 unsigned r, g, b; | |
| 1285 RGB_FROM_PIXEL(*src, sfmt, r, g, b); | |
| 1286 PIXEL_FROM_RGB(*d, dfmt, r, g, b); | |
| 1287 src++; | |
| 1288 d++; | |
| 1289 } | |
| 1290 return n * 2; | |
| 1291 } | |
| 1292 | |
| 1293 /* decode opaque pixels from 16bpp to 32bpp rgb + a */ | |
| 1294 static int uncopy_opaque_16(Uint32 *dst, void *src, int n, | |
| 1295 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1296 { | |
| 1297 int i; | |
| 1298 Uint16 *s = src; | |
| 1299 unsigned alpha = dfmt->Amask ? 255 : 0; | |
| 1300 for(i = 0; i < n; i++) { | |
| 1301 unsigned r, g, b; | |
| 1302 RGB_FROM_PIXEL(*s, sfmt, r, g, b); | |
| 1303 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha); | |
| 1304 s++; | |
| 1305 dst++; | |
| 1306 } | |
| 1307 return n * 2; | |
| 1308 } | |
| 1309 | |
| 1310 | |
| 1311 | |
| 1312 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */ | |
| 1313 static int copy_transl_565(void *dst, Uint32 *src, int n, | |
| 1314 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1315 { | |
| 1316 int i; | |
| 1317 Uint32 *d = dst; | |
| 1318 for(i = 0; i < n; i++) { | |
| 1319 unsigned r, g, b, a; | |
| 1320 Uint16 pix; | |
| 1321 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1322 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1323 *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0); | |
| 1324 src++; | |
| 1325 d++; | |
| 1326 } | |
| 1327 return n * 4; | |
| 1328 } | |
| 1329 | |
| 1330 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */ | |
| 1331 static int copy_transl_555(void *dst, Uint32 *src, int n, | |
| 1332 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1333 { | |
| 1334 int i; | |
| 1335 Uint32 *d = dst; | |
| 1336 for(i = 0; i < n; i++) { | |
| 1337 unsigned r, g, b, a; | |
| 1338 Uint16 pix; | |
| 1339 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1340 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1341 *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0); | |
| 1342 src++; | |
| 1343 d++; | |
| 1344 } | |
| 1345 return n * 4; | |
| 1346 } | |
| 1347 | |
| 1348 /* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */ | |
| 1349 static int uncopy_transl_16(Uint32 *dst, void *src, int n, | |
| 1350 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1351 { | |
| 1352 int i; | |
| 1353 Uint32 *s = src; | |
| 1354 for(i = 0; i < n; i++) { | |
| 1355 unsigned r, g, b, a; | |
| 1356 Uint32 pix = *s++; | |
| 1357 a = (pix & 0x3e0) >> 2; | |
| 1358 pix = (pix & ~0x3e0) | pix >> 16; | |
| 1359 RGB_FROM_PIXEL(pix, sfmt, r, g, b); | |
| 1360 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1361 dst++; | |
| 1362 } | |
| 1363 return n * 4; | |
| 1364 } | |
| 1365 | |
| 1366 /* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1367 static int copy_32(void *dst, Uint32 *src, int n, | |
| 1368 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1369 { | |
| 1370 int i; | |
| 1371 Uint32 *d = dst; | |
| 1372 for(i = 0; i < n; i++) { | |
| 1373 unsigned r, g, b, a; | |
| 1374 Uint32 pixel; | |
| 1375 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1376 PIXEL_FROM_RGB(pixel, dfmt, r, g, b); | |
| 1377 *d++ = pixel | a << 24; | |
| 1378 src++; | |
| 1379 } | |
| 1380 return n * 4; | |
| 1381 } | |
| 1382 | |
| 1383 /* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1384 static int uncopy_32(Uint32 *dst, void *src, int n, | |
| 1385 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1386 { | |
| 1387 int i; | |
| 1388 Uint32 *s = src; | |
| 1389 for(i = 0; i < n; i++) { | |
| 1390 unsigned r, g, b, a; | |
| 1391 Uint32 pixel = *s++; | |
| 1392 RGB_FROM_PIXEL(pixel, sfmt, r, g, b); | |
| 1393 a = pixel >> 24; | |
| 1394 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1395 dst++; | |
| 1396 } | |
| 1397 return n * 4; | |
| 1398 } | |
| 1399 | |
| 1400 #define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255) | |
| 1401 | |
| 1402 #define ISTRANSL(pixel, fmt) \ | |
| 1403 ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U) | |
| 1404 | |
| 1405 /* convert surface to be quickly alpha-blittable onto dest, if possible */ | |
| 1406 static int RLEAlphaSurface(SDL_Surface *surface) | |
| 1407 { | |
| 1408 SDL_Surface *dest; | |
| 1409 SDL_PixelFormat *df; | |
| 1410 int maxsize = 0; | |
| 1411 int max_opaque_run; | |
| 1412 int max_transl_run = 65535; | |
| 1413 unsigned masksum; | |
| 1414 Uint8 *rlebuf, *dst; | |
| 1415 int (*copy_opaque)(void *, Uint32 *, int, | |
| 1416 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1417 int (*copy_transl)(void *, Uint32 *, int, | |
| 1418 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1419 | |
| 1420 dest = surface->map->dst; | |
| 1421 if(!dest) | |
| 1422 return -1; | |
| 1423 df = dest->format; | |
| 1424 if(surface->format->BitsPerPixel != 32) | |
| 1425 return -1; /* only 32bpp source supported */ | |
| 1426 | |
| 1427 /* find out whether the destination is one we support, | |
| 1428 and determine the max size of the encoded result */ | |
| 1429 masksum = df->Rmask | df->Gmask | df->Bmask; | |
| 1430 switch(df->BytesPerPixel) { | |
| 1431 case 2: | |
| 1432 /* 16bpp: only support 565 and 555 formats */ | |
| 1433 switch(masksum) { | |
| 1434 case 0xffff: | |
| 1435 if(df->Gmask == 0x07e0 | |
| 1436 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) { | |
| 1437 copy_opaque = copy_opaque_16; | |
| 1438 copy_transl = copy_transl_565; | |
| 1439 } else | |
| 1440 return -1; | |
| 1441 break; | |
| 1442 case 0x7fff: | |
| 1443 if(df->Gmask == 0x03e0 | |
| 1444 || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) { | |
| 1445 copy_opaque = copy_opaque_16; | |
| 1446 copy_transl = copy_transl_555; | |
| 1447 } else | |
| 1448 return -1; | |
| 1449 break; | |
| 1450 default: | |
| 1451 return -1; | |
| 1452 } | |
| 1453 max_opaque_run = 255; /* runs stored as bytes */ | |
| 1454 | |
| 1455 /* worst case is alternating opaque and translucent pixels, | |
| 1456 with room for alignment padding between lines */ | |
| 1457 maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2; | |
| 1458 break; | |
| 1459 case 4: | |
| 1460 if(masksum != 0x00ffffff) | |
| 1461 return -1; /* requires unused high byte */ | |
| 1462 copy_opaque = copy_32; | |
| 1463 copy_transl = copy_32; | |
| 1464 max_opaque_run = 255; /* runs stored as short ints */ | |
| 1465 | |
| 1466 /* worst case is alternating opaque and translucent pixels */ | |
| 1467 maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4; | |
| 1468 break; | |
| 1469 default: | |
| 1470 return -1; /* anything else unsupported right now */ | |
| 1471 } | |
| 1472 | |
| 1473 maxsize += sizeof(RLEDestFormat); | |
| 1474 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1475 if(!rlebuf) { | |
| 1476 SDL_OutOfMemory(); | |
| 1477 return -1; | |
| 1478 } | |
| 1479 { | |
| 1480 /* save the destination format so we can undo the encoding later */ | |
| 1481 RLEDestFormat *r = (RLEDestFormat *)rlebuf; | |
| 1482 r->BytesPerPixel = df->BytesPerPixel; | |
| 1483 r->Rloss = df->Rloss; | |
| 1484 r->Gloss = df->Gloss; | |
| 1485 r->Bloss = df->Bloss; | |
| 1486 r->Rshift = df->Rshift; | |
| 1487 r->Gshift = df->Gshift; | |
| 1488 r->Bshift = df->Bshift; | |
| 1489 r->Ashift = df->Ashift; | |
| 1490 r->Rmask = df->Rmask; | |
| 1491 r->Gmask = df->Gmask; | |
| 1492 r->Bmask = df->Bmask; | |
| 1493 r->Amask = df->Amask; | |
| 1494 } | |
| 1495 dst = rlebuf + sizeof(RLEDestFormat); | |
| 1496 | |
| 1497 /* Do the actual encoding */ | |
| 1498 { | |
| 1499 int x, y; | |
| 1500 int h = surface->h, w = surface->w; | |
| 1501 SDL_PixelFormat *sf = surface->format; | |
|
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1502 Uint32 *src = (Uint32 *)surface->pixels; |
| 0 | 1503 Uint8 *lastline = dst; /* end of last non-blank line */ |
| 1504 | |
| 1505 /* opaque counts are 8 or 16 bits, depending on target depth */ | |
| 1506 #define ADD_OPAQUE_COUNTS(n, m) \ | |
| 1507 if(df->BytesPerPixel == 4) { \ | |
| 1508 ((Uint16 *)dst)[0] = n; \ | |
| 1509 ((Uint16 *)dst)[1] = m; \ | |
| 1510 dst += 4; \ | |
| 1511 } else { \ | |
| 1512 dst[0] = n; \ | |
| 1513 dst[1] = m; \ | |
| 1514 dst += 2; \ | |
| 1515 } | |
| 1516 | |
| 1517 /* translucent counts are always 16 bit */ | |
| 1518 #define ADD_TRANSL_COUNTS(n, m) \ | |
| 1519 (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4) | |
| 1520 | |
| 1521 for(y = 0; y < h; y++) { | |
| 1522 int runstart, skipstart; | |
| 1523 int blankline = 0; | |
| 1524 /* First encode all opaque pixels of a scan line */ | |
| 1525 x = 0; | |
| 1526 do { | |
| 1527 int run, skip, len; | |
| 1528 skipstart = x; | |
| 1529 while(x < w && !ISOPAQUE(src[x], sf)) | |
| 1530 x++; | |
| 1531 runstart = x; | |
| 1532 while(x < w && ISOPAQUE(src[x], sf)) | |
| 1533 x++; | |
| 1534 skip = runstart - skipstart; | |
| 1535 if(skip == w) | |
| 1536 blankline = 1; | |
| 1537 run = x - runstart; | |
| 1538 while(skip > max_opaque_run) { | |
| 1539 ADD_OPAQUE_COUNTS(max_opaque_run, 0); | |
| 1540 skip -= max_opaque_run; | |
| 1541 } | |
| 1542 len = MIN(run, max_opaque_run); | |
| 1543 ADD_OPAQUE_COUNTS(skip, len); | |
| 1544 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1545 runstart += len; | |
| 1546 run -= len; | |
| 1547 while(run) { | |
| 1548 len = MIN(run, max_opaque_run); | |
| 1549 ADD_OPAQUE_COUNTS(0, len); | |
| 1550 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1551 runstart += len; | |
| 1552 run -= len; | |
| 1553 } | |
| 1554 } while(x < w); | |
| 1555 | |
| 1556 /* Make sure the next output address is 32-bit aligned */ | |
| 1557 dst += (unsigned long)dst & 2; | |
| 1558 | |
| 1559 /* Next, encode all translucent pixels of the same scan line */ | |
| 1560 x = 0; | |
| 1561 do { | |
| 1562 int run, skip, len; | |
| 1563 skipstart = x; | |
| 1564 while(x < w && !ISTRANSL(src[x], sf)) | |
| 1565 x++; | |
| 1566 runstart = x; | |
| 1567 while(x < w && ISTRANSL(src[x], sf)) | |
| 1568 x++; | |
| 1569 skip = runstart - skipstart; | |
| 1570 blankline &= (skip == w); | |
| 1571 run = x - runstart; | |
| 1572 while(skip > max_transl_run) { | |
| 1573 ADD_TRANSL_COUNTS(max_transl_run, 0); | |
| 1574 skip -= max_transl_run; | |
| 1575 } | |
| 1576 len = MIN(run, max_transl_run); | |
| 1577 ADD_TRANSL_COUNTS(skip, len); | |
| 1578 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1579 runstart += len; | |
| 1580 run -= len; | |
| 1581 while(run) { | |
| 1582 len = MIN(run, max_transl_run); | |
| 1583 ADD_TRANSL_COUNTS(0, len); | |
| 1584 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1585 runstart += len; | |
| 1586 run -= len; | |
| 1587 } | |
| 1588 if(!blankline) | |
| 1589 lastline = dst; | |
| 1590 } while(x < w); | |
| 1591 | |
| 1592 src += surface->pitch >> 2; | |
| 1593 } | |
| 1594 dst = lastline; /* back up past trailing blank lines */ | |
| 1595 ADD_OPAQUE_COUNTS(0, 0); | |
| 1596 } | |
| 1597 | |
| 1598 #undef ADD_OPAQUE_COUNTS | |
| 1599 #undef ADD_TRANSL_COUNTS | |
| 1600 | |
| 1601 /* Now that we have it encoded, release the original pixels */ | |
| 1602 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1603 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1604 free( surface->pixels ); | |
| 1605 surface->pixels = NULL; | |
| 1606 } | |
| 1607 | |
| 1608 /* realloc the buffer to release unused memory */ | |
| 1609 { | |
| 1610 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1611 if(!p) | |
| 1612 p = rlebuf; | |
| 1613 surface->map->sw_data->aux_data = p; | |
| 1614 } | |
| 1615 | |
| 1616 return 0; | |
| 1617 } | |
| 1618 | |
| 1619 static Uint32 getpix_8(Uint8 *srcbuf) | |
| 1620 { | |
| 1621 return *srcbuf; | |
| 1622 } | |
| 1623 | |
| 1624 static Uint32 getpix_16(Uint8 *srcbuf) | |
| 1625 { | |
| 1626 return *(Uint16 *)srcbuf; | |
| 1627 } | |
| 1628 | |
| 1629 static Uint32 getpix_24(Uint8 *srcbuf) | |
| 1630 { | |
| 1631 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) | |
| 1632 return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16); | |
| 1633 else | |
| 1634 return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2]; | |
| 1635 } | |
| 1636 | |
| 1637 static Uint32 getpix_32(Uint8 *srcbuf) | |
| 1638 { | |
| 1639 return *(Uint32 *)srcbuf; | |
| 1640 } | |
| 1641 | |
| 1642 typedef Uint32 (*getpix_func)(Uint8 *); | |
| 1643 | |
| 1644 static getpix_func getpixes[4] = { | |
| 1645 getpix_8, getpix_16, getpix_24, getpix_32 | |
| 1646 }; | |
| 1647 | |
| 1648 static int RLEColorkeySurface(SDL_Surface *surface) | |
| 1649 { | |
| 1650 Uint8 *rlebuf, *dst; | |
| 1651 int maxn; | |
| 1652 int y; | |
| 1653 Uint8 *srcbuf, *curbuf, *lastline; | |
| 1654 int maxsize = 0; | |
| 1655 int skip, run; | |
| 1656 int bpp = surface->format->BytesPerPixel; | |
| 1657 getpix_func getpix; | |
| 1658 Uint32 ckey, rgbmask; | |
| 1659 int w, h; | |
| 1660 | |
| 1661 /* calculate the worst case size for the compressed surface */ | |
| 1662 switch(bpp) { | |
| 1663 case 1: | |
| 1664 /* worst case is alternating opaque and transparent pixels, | |
| 1665 starting with an opaque pixel */ | |
| 1666 maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2; | |
| 1667 break; | |
| 1668 case 2: | |
| 1669 case 3: | |
| 1670 /* worst case is solid runs, at most 255 pixels wide */ | |
| 1671 maxsize = surface->h * (2 * (surface->w / 255 + 1) | |
| 1672 + surface->w * bpp) + 2; | |
| 1673 break; | |
| 1674 case 4: | |
| 1675 /* worst case is solid runs, at most 65535 pixels wide */ | |
| 1676 maxsize = surface->h * (4 * (surface->w / 65535 + 1) | |
| 1677 + surface->w * 4) + 4; | |
| 1678 break; | |
| 1679 } | |
| 1680 | |
| 1681 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1682 if ( rlebuf == NULL ) { | |
| 1683 SDL_OutOfMemory(); | |
| 1684 return(-1); | |
| 1685 } | |
| 1686 | |
| 1687 /* Set up the conversion */ | |
|
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diff
changeset
|
1688 srcbuf = (Uint8 *)surface->pixels; |
| 0 | 1689 curbuf = srcbuf; |
| 1690 maxn = bpp == 4 ? 65535 : 255; | |
| 1691 skip = run = 0; | |
| 1692 dst = rlebuf; | |
| 1693 rgbmask = ~surface->format->Amask; | |
| 1694 ckey = surface->format->colorkey & rgbmask; | |
| 1695 lastline = dst; | |
| 1696 getpix = getpixes[bpp - 1]; | |
| 1697 w = surface->w; | |
| 1698 h = surface->h; | |
| 1699 | |
| 1700 #define ADD_COUNTS(n, m) \ | |
| 1701 if(bpp == 4) { \ | |
| 1702 ((Uint16 *)dst)[0] = n; \ | |
| 1703 ((Uint16 *)dst)[1] = m; \ | |
| 1704 dst += 4; \ | |
| 1705 } else { \ | |
| 1706 dst[0] = n; \ | |
| 1707 dst[1] = m; \ | |
| 1708 dst += 2; \ | |
| 1709 } | |
| 1710 | |
| 1711 for(y = 0; y < h; y++) { | |
| 1712 int x = 0; | |
| 1713 int blankline = 0; | |
| 1714 do { | |
| 1715 int run, skip, len; | |
| 1716 int runstart; | |
| 1717 int skipstart = x; | |
| 1718 | |
| 1719 /* find run of transparent, then opaque pixels */ | |
| 1720 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey) | |
| 1721 x++; | |
| 1722 runstart = x; | |
| 1723 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey) | |
| 1724 x++; | |
| 1725 skip = runstart - skipstart; | |
| 1726 if(skip == w) | |
| 1727 blankline = 1; | |
| 1728 run = x - runstart; | |
| 1729 | |
| 1730 /* encode segment */ | |
| 1731 while(skip > maxn) { | |
| 1732 ADD_COUNTS(maxn, 0); | |
| 1733 skip -= maxn; | |
| 1734 } | |
| 1735 len = MIN(run, maxn); | |
| 1736 ADD_COUNTS(skip, len); | |
| 1737 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1738 dst += len * bpp; | |
| 1739 run -= len; | |
| 1740 runstart += len; | |
| 1741 while(run) { | |
| 1742 len = MIN(run, maxn); | |
| 1743 ADD_COUNTS(0, len); | |
| 1744 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1745 dst += len * bpp; | |
| 1746 runstart += len; | |
| 1747 run -= len; | |
| 1748 } | |
| 1749 if(!blankline) | |
| 1750 lastline = dst; | |
| 1751 } while(x < w); | |
| 1752 | |
| 1753 srcbuf += surface->pitch; | |
| 1754 } | |
| 1755 dst = lastline; /* back up bast trailing blank lines */ | |
| 1756 ADD_COUNTS(0, 0); | |
| 1757 | |
| 1758 #undef ADD_COUNTS | |
| 1759 | |
| 1760 /* Now that we have it encoded, release the original pixels */ | |
| 1761 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1762 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1763 free( surface->pixels ); | |
| 1764 surface->pixels = NULL; | |
| 1765 } | |
| 1766 | |
| 1767 /* realloc the buffer to release unused memory */ | |
| 1768 { | |
| 1769 /* If realloc returns NULL, the original block is left intact */ | |
| 1770 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1771 if(!p) | |
| 1772 p = rlebuf; | |
| 1773 surface->map->sw_data->aux_data = p; | |
| 1774 } | |
| 1775 | |
| 1776 return(0); | |
| 1777 } | |
| 1778 | |
| 1779 int SDL_RLESurface(SDL_Surface *surface) | |
| 1780 { | |
| 1781 int retcode; | |
| 1782 | |
| 1783 /* Clear any previous RLE conversion */ | |
| 1784 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1785 SDL_UnRLESurface(surface, 1); | |
| 1786 } | |
| 1787 | |
| 1788 /* We don't support RLE encoding of bitmaps */ | |
| 1789 if ( surface->format->BitsPerPixel < 8 ) { | |
| 1790 return(-1); | |
| 1791 } | |
| 1792 | |
| 1793 /* Lock the surface if it's in hardware */ | |
|
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parents:
297
diff
changeset
|
1794 if ( SDL_MUSTLOCK(surface) ) { |
|
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parents:
297
diff
changeset
|
1795 if ( SDL_LockSurface(surface) < 0 ) { |
| 0 | 1796 return(-1); |
| 1797 } | |
| 1798 } | |
| 1799 | |
| 1800 /* Encode */ | |
| 1801 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1802 retcode = RLEColorkeySurface(surface); | |
| 1803 } else { | |
| 1804 if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 1805 && surface->format->Amask != 0) | |
| 1806 retcode = RLEAlphaSurface(surface); | |
| 1807 else | |
| 1808 retcode = -1; /* no RLE for per-surface alpha sans ckey */ | |
| 1809 } | |
| 1810 | |
| 1811 /* Unlock the surface if it's in hardware */ | |
|
526
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
1812 if ( SDL_MUSTLOCK(surface) ) { |
|
4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
1813 SDL_UnlockSurface(surface); |
| 0 | 1814 } |
| 1815 | |
| 1816 if(retcode < 0) | |
| 1817 return -1; | |
| 1818 | |
| 1819 /* The surface is now accelerated */ | |
| 1820 surface->flags |= SDL_RLEACCEL; | |
| 1821 | |
| 1822 return(0); | |
| 1823 } | |
| 1824 | |
| 1825 /* | |
| 1826 * Un-RLE a surface with pixel alpha | |
| 1827 * This may not give back exactly the image before RLE-encoding; all | |
| 1828 * completely transparent pixels will be lost, and colour and alpha depth | |
| 1829 * may have been reduced (when encoding for 16bpp targets). | |
| 1830 */ | |
| 1831 static void UnRLEAlpha(SDL_Surface *surface) | |
| 1832 { | |
| 1833 Uint8 *srcbuf; | |
| 1834 Uint32 *dst; | |
| 1835 SDL_PixelFormat *sf = surface->format; | |
| 1836 RLEDestFormat *df = surface->map->sw_data->aux_data; | |
| 1837 int (*uncopy_opaque)(Uint32 *, void *, int, | |
| 1838 RLEDestFormat *, SDL_PixelFormat *); | |
| 1839 int (*uncopy_transl)(Uint32 *, void *, int, | |
| 1840 RLEDestFormat *, SDL_PixelFormat *); | |
| 1841 int w = surface->w; | |
| 1842 int bpp = df->BytesPerPixel; | |
| 1843 | |
| 1844 if(bpp == 2) { | |
| 1845 uncopy_opaque = uncopy_opaque_16; | |
| 1846 uncopy_transl = uncopy_transl_16; | |
| 1847 } else { | |
| 1848 uncopy_opaque = uncopy_transl = uncopy_32; | |
| 1849 } | |
| 1850 | |
| 1851 surface->pixels = malloc(surface->h * surface->pitch); | |
| 1852 /* fill background with transparent pixels */ | |
| 1853 memset(surface->pixels, 0, surface->h * surface->pitch); | |
| 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) | |
| 1875 return; | |
| 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 } | |
| 1896 } | |
| 1897 | |
| 1898 void SDL_UnRLESurface(SDL_Surface *surface, int recode) | |
| 1899 { | |
| 1900 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1901 surface->flags &= ~SDL_RLEACCEL; | |
| 1902 | |
| 1903 if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1904 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1905 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1906 SDL_Rect full; | |
| 1907 unsigned alpha_flag; | |
| 1908 | |
| 1909 /* re-create the original surface */ | |
| 1910 surface->pixels = malloc(surface->h * surface->pitch); | |
| 1911 | |
| 1912 /* fill it with the background colour */ | |
| 1913 SDL_FillRect(surface, NULL, surface->format->colorkey); | |
| 1914 | |
| 1915 /* now render the encoded surface */ | |
| 1916 full.x = full.y = 0; | |
| 1917 full.w = surface->w; | |
| 1918 full.h = surface->h; | |
| 1919 alpha_flag = surface->flags & SDL_SRCALPHA; | |
| 1920 surface->flags &= ~SDL_SRCALPHA; /* opaque blit */ | |
| 1921 SDL_RLEBlit(surface, &full, surface, &full); | |
| 1922 surface->flags |= alpha_flag; | |
| 1923 } else | |
| 1924 UnRLEAlpha(surface); | |
| 1925 } | |
| 1926 | |
| 1927 if ( surface->map && surface->map->sw_data->aux_data ) { | |
| 1928 free(surface->map->sw_data->aux_data); | |
| 1929 surface->map->sw_data->aux_data = NULL; | |
| 1930 } | |
| 1931 } | |
| 1932 } | |
| 1933 | |
| 1934 |