Mercurial > sdl-ios-xcode
annotate src/video/SDL_RLEaccel.c @ 712:8be92df64b22
Finally bugfixed: the simpler the better
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Wed, 03 Sep 2003 20:07:16 +0000 |
| parents | 5bb080d35049 |
| children | 22dbf364c017 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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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Updated the source with the correct e-mail address
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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 /* Function to check the CPU flags */ |
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108 #define MMX_CPU 0x800000 |
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109 #define CPU_Flags() Hermes_X86_CPU() |
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110 #define X86_ASSEMBLER |
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111 #define HermesConverterInterface void |
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112 #define HermesClearInterface void |
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113 #define STACKCALL |
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114 #include "HeadX86.h" |
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115 #endif |
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116 |
| 0 | 117 #ifndef MAX |
| 118 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 119 #endif | |
| 120 #ifndef MIN | |
| 121 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 122 #endif | |
| 123 | |
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124 #define PIXEL_COPY(to, from, len, bpp) \ |
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125 do { \ |
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126 if(bpp == 4) { \ |
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127 SDL_memcpy4(to, from, (unsigned)(len)); \ |
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128 } else { \ |
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129 SDL_memcpy(to, from, (unsigned)(len) * (bpp)); \ |
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130 } \ |
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131 } while(0) |
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132 |
| 0 | 133 /* |
| 134 * Various colorkey blit methods, for opaque and per-surface alpha | |
| 135 */ | |
| 136 | |
| 137 #define OPAQUE_BLIT(to, from, length, bpp, alpha) \ | |
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138 PIXEL_COPY(to, from, length, bpp) |
| 0 | 139 |
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140 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
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141 |
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142 #define ALPHA_BLIT32_888MMX(to, from, length, bpp, alpha) \ |
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143 do { \ |
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144 Uint32 *srcp = (Uint32 *)(from); \ |
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145 Uint32 *dstp = (Uint32 *)(to); \ |
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146 int i = 0x00FF00FF; \ |
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147 movd_m2r(*(&i), mm3); \ |
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148 punpckldq_r2r(mm3, mm3); \ |
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149 i = 0xFF000000; \ |
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150 movd_m2r(*(&i), mm7); \ |
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151 punpckldq_r2r(mm7, mm7); \ |
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152 i = alpha | alpha << 16; \ |
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153 movd_m2r(*(&i), mm4); \ |
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154 punpckldq_r2r(mm4, mm4); \ |
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155 pcmpeqd_r2r(mm5,mm5); /* set mm5 to "1" */ \ |
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156 pxor_r2r(mm7, mm5); /* make clear alpha mask */ \ |
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157 i = length; \ |
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158 if(i & 1) { \ |
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159 movd_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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160 punpcklbw_r2r(mm1, mm1); \ |
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161 pand_r2r(mm3, mm1); \ |
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162 movd_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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163 punpcklbw_r2r(mm2, mm2); \ |
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164 pand_r2r(mm3, mm2); \ |
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165 psubw_r2r(mm2, mm1); \ |
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166 pmullw_r2r(mm4, mm1); \ |
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167 psrlw_i2r(8, mm1); \ |
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168 paddw_r2r(mm1, mm2); \ |
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169 pand_r2r(mm3, mm2); \ |
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170 packuswb_r2r(mm2, mm2); \ |
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171 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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172 movd_r2m(mm2, *dstp); \ |
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173 ++srcp; \ |
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174 ++dstp; \ |
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175 i--; \ |
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176 } \ |
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177 for(; i > 0; --i) { \ |
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178 movq_m2r((*srcp), mm0); \ |
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179 movq_r2r(mm0, mm1); \ |
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180 punpcklbw_r2r(mm0, mm0); \ |
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181 movq_m2r((*dstp), mm2); \ |
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182 punpckhbw_r2r(mm1, mm1); \ |
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183 movq_r2r(mm2, mm6); \ |
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184 pand_r2r(mm3, mm0); \ |
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185 punpcklbw_r2r(mm2, mm2); \ |
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186 pand_r2r(mm3, mm1); \ |
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187 punpckhbw_r2r(mm6, mm6); \ |
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188 pand_r2r(mm3, mm2); \ |
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189 psubw_r2r(mm2, mm0); \ |
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190 pmullw_r2r(mm4, mm0); \ |
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191 pand_r2r(mm3, mm6); \ |
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192 psubw_r2r(mm6, mm1); \ |
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193 pmullw_r2r(mm4, mm1); \ |
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194 psrlw_i2r(8, mm0); \ |
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195 paddw_r2r(mm0, mm2); \ |
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196 psrlw_i2r(8, mm1); \ |
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197 paddw_r2r(mm1, mm6); \ |
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198 pand_r2r(mm3, mm2); \ |
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199 pand_r2r(mm3, mm6); \ |
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200 packuswb_r2r(mm2, mm2); \ |
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201 packuswb_r2r(mm6, mm6); \ |
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202 psrlq_i2r(32, mm2); \ |
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203 psllq_i2r(32, mm6); \ |
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204 por_r2r(mm6, mm2); \ |
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205 pand_r2r(mm5, mm2); /* 00000RGB -> mm2 */ \ |
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206 movq_r2m(mm2, *dstp); \ |
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207 srcp += 2; \ |
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208 dstp += 2; \ |
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209 i--; \ |
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210 } \ |
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211 emms(); \ |
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212 } while(0) |
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213 |
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214 #define ALPHA_BLIT16_565MMX(to, from, length, bpp, alpha) \ |
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215 do { \ |
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216 int i, n = 0; \ |
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217 Uint16 *srcp = (Uint16 *)(from); \ |
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218 Uint16 *dstp = (Uint16 *)(to); \ |
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219 Uint32 ALPHA = 0xF800; \ |
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220 movd_m2r(*(&ALPHA), mm1); \ |
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221 punpcklwd_r2r(mm1, mm1); \ |
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222 punpcklwd_r2r(mm1, mm1); \ |
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223 ALPHA = 0x07E0; \ |
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224 movd_m2r(*(&ALPHA), mm4); \ |
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225 punpcklwd_r2r(mm4, mm4); \ |
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226 punpcklwd_r2r(mm4, mm4); \ |
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227 ALPHA = 0x001F; \ |
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228 movd_m2r(*(&ALPHA), mm7); \ |
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229 punpcklwd_r2r(mm7, mm7); \ |
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230 punpcklwd_r2r(mm7, mm7); \ |
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231 alpha &= ~(1+2+4); \ |
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232 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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233 movd_m2r(*(&i), mm0); \ |
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234 punpckldq_r2r(mm0, mm0); \ |
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235 ALPHA = alpha >> 3; \ |
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236 i = ((int)(length) & 3); \ |
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237 for(; i > 0; --i) { \ |
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238 Uint32 s = *srcp++; \ |
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239 Uint32 d = *dstp; \ |
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240 s = (s | s << 16) & 0x07e0f81f; \ |
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241 d = (d | d << 16) & 0x07e0f81f; \ |
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242 d += (s - d) * ALPHA >> 5; \ |
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243 d &= 0x07e0f81f; \ |
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244 *dstp++ = d | d >> 16; \ |
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245 n++; \ |
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246 } \ |
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247 i = (int)(length) - n; \ |
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248 for(; i > 0; --i) { \ |
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249 movq_m2r((*dstp), mm3); \ |
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250 movq_m2r((*srcp), mm2); \ |
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251 movq_r2r(mm2, mm5); \ |
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252 pand_r2r(mm1 , mm5); \ |
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253 psrlq_i2r(11, mm5); \ |
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254 movq_r2r(mm3, mm6); \ |
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255 pand_r2r(mm1 , mm6); \ |
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256 psrlq_i2r(11, mm6); \ |
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257 psubw_r2r(mm6, mm5); \ |
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258 pmullw_r2r(mm0, mm5); \ |
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259 psrlw_i2r(8, mm5); \ |
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260 paddw_r2r(mm5, mm6); \ |
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261 psllq_i2r(11, mm6); \ |
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262 pand_r2r(mm1, mm6); \ |
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263 movq_r2r(mm4, mm5); \ |
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264 por_r2r(mm7, mm5); \ |
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265 pand_r2r(mm5, mm3); \ |
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266 por_r2r(mm6, mm3); \ |
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267 movq_r2r(mm2, mm5); \ |
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268 pand_r2r(mm4 , mm5); \ |
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269 psrlq_i2r(5, mm5); \ |
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270 movq_r2r(mm3, mm6); \ |
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271 pand_r2r(mm4 , mm6); \ |
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272 psrlq_i2r(5, mm6); \ |
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273 psubw_r2r(mm6, mm5); \ |
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274 pmullw_r2r(mm0, mm5); \ |
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275 psrlw_i2r(8, mm5); \ |
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276 paddw_r2r(mm5, mm6); \ |
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277 psllq_i2r(5, mm6); \ |
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278 pand_r2r(mm4, mm6); \ |
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279 movq_r2r(mm1, mm5); \ |
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280 por_r2r(mm7, mm5); \ |
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281 pand_r2r(mm5, mm3); \ |
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282 por_r2r(mm6, mm3); \ |
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283 movq_r2r(mm2, mm5); \ |
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284 pand_r2r(mm7 , mm5); \ |
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285 movq_r2r(mm3, mm6); \ |
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286 pand_r2r(mm7 , mm6); \ |
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287 psubw_r2r(mm6, mm5); \ |
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288 pmullw_r2r(mm0, mm5); \ |
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289 psrlw_i2r(8, mm5); \ |
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290 paddw_r2r(mm5, mm6); \ |
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291 pand_r2r(mm7, mm6); \ |
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292 movq_r2r(mm1, mm5); \ |
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293 por_r2r(mm4, mm5); \ |
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294 pand_r2r(mm5, mm3); \ |
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295 por_r2r(mm6, mm3); \ |
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296 movq_r2m(mm3, *dstp); \ |
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297 srcp += 4; \ |
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298 dstp += 4; \ |
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299 i -= 3; \ |
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300 } \ |
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301 emms(); \ |
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302 } while(0) |
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303 |
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304 #define ALPHA_BLIT16_555MMX(to, from, length, bpp, alpha) \ |
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305 do { \ |
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306 int i, n = 0; \ |
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307 Uint16 *srcp = (Uint16 *)(from); \ |
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308 Uint16 *dstp = (Uint16 *)(to); \ |
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309 Uint32 ALPHA = 0x7C00; \ |
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310 movd_m2r(*(&ALPHA), mm1); \ |
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311 punpcklwd_r2r(mm1, mm1); \ |
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312 punpcklwd_r2r(mm1, mm1); \ |
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313 ALPHA = 0x03E0; \ |
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314 movd_m2r(*(&ALPHA), mm4); \ |
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315 punpcklwd_r2r(mm4, mm4); \ |
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316 punpcklwd_r2r(mm4, mm4); \ |
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317 ALPHA = 0x001F; \ |
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318 movd_m2r(*(&ALPHA), mm7); \ |
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319 punpcklwd_r2r(mm7, mm7); \ |
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320 punpcklwd_r2r(mm7, mm7); \ |
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321 alpha &= ~(1+2+4); \ |
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322 i = (Uint32)alpha | (Uint32)alpha << 16; \ |
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323 movd_m2r(*(&i), mm0); \ |
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324 punpckldq_r2r(mm0, mm0); \ |
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325 i = ((int)(length) & 3); \ |
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326 ALPHA = alpha >> 3; \ |
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327 for(; i > 0; --i) { \ |
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328 Uint32 s = *srcp++; \ |
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329 Uint32 d = *dstp; \ |
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330 s = (s | s << 16) & 0x03e07c1f; \ |
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331 d = (d | d << 16) & 0x03e07c1f; \ |
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332 d += (s - d) * ALPHA >> 5; \ |
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333 d &= 0x03e07c1f; \ |
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334 *dstp++ = d | d >> 16; \ |
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335 n++; \ |
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336 } \ |
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337 i = (int)(length) - n; \ |
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338 for(; i > 0; --i) { \ |
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339 movq_m2r((*dstp), mm3); \ |
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340 movq_m2r((*srcp), mm2); \ |
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341 movq_r2r(mm2, mm5); \ |
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342 pand_r2r(mm1 , mm5); \ |
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343 psrlq_i2r(10, mm5); \ |
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344 movq_r2r(mm3, mm6); \ |
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345 pand_r2r(mm1 , mm6); \ |
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346 psrlq_i2r(10, mm6); \ |
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347 psubw_r2r(mm6, mm5); \ |
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348 pmullw_r2r(mm0, mm5); \ |
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349 psrlw_i2r(8, mm5); \ |
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350 paddw_r2r(mm5, mm6); \ |
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351 psllq_i2r(10, mm6); \ |
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352 pand_r2r(mm1, mm6); \ |
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353 movq_r2r(mm4, mm5); \ |
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354 por_r2r(mm7, mm5); \ |
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355 pand_r2r(mm5, mm3); \ |
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356 por_r2r(mm6, mm3); \ |
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357 movq_r2r(mm2, mm5); \ |
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358 pand_r2r(mm4 , mm5); \ |
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359 psrlq_i2r(5, mm5); \ |
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360 movq_r2r(mm3, mm6); \ |
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361 pand_r2r(mm4 , mm6); \ |
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362 psrlq_i2r(5, mm6); \ |
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363 psubw_r2r(mm6, mm5); \ |
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364 pmullw_r2r(mm0, mm5); \ |
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365 psrlw_i2r(8, mm5); \ |
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366 paddw_r2r(mm5, mm6); \ |
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367 psllq_i2r(5, mm6); \ |
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368 pand_r2r(mm4, mm6); \ |
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369 movq_r2r(mm1, mm5); \ |
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370 por_r2r(mm7, mm5); \ |
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371 pand_r2r(mm5, mm3); \ |
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372 por_r2r(mm6, mm3); \ |
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373 movq_r2r(mm2, mm5); \ |
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374 pand_r2r(mm7 , mm5); \ |
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375 movq_r2r(mm3, mm6); \ |
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376 pand_r2r(mm7 , mm6); \ |
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377 psubw_r2r(mm6, mm5); \ |
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378 pmullw_r2r(mm0, mm5); \ |
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379 psrlw_i2r(8, mm5); \ |
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380 paddw_r2r(mm5, mm6); \ |
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381 pand_r2r(mm7, mm6); \ |
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382 movq_r2r(mm1, mm5); \ |
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383 por_r2r(mm4, mm5); \ |
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384 pand_r2r(mm5, mm3); \ |
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385 por_r2r(mm6, mm3); \ |
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386 movq_r2m(mm3, *dstp); \ |
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387 srcp += 4; \ |
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388 dstp += 4; \ |
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389 i -= 3; \ |
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390 } \ |
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391 emms(); \ |
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392 } while(0) |
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393 |
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394 #endif |
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395 |
| 0 | 396 /* |
| 397 * For 32bpp pixels on the form 0x00rrggbb: | |
| 398 * If we treat the middle component separately, we can process the two | |
| 399 * remaining in parallel. This is safe to do because of the gap to the left | |
| 400 * of each component, so the bits from the multiplication don't collide. | |
| 401 * This can be used for any RGB permutation of course. | |
| 402 */ | |
| 403 #define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \ | |
| 404 do { \ | |
| 405 int i; \ | |
| 406 Uint32 *src = (Uint32 *)(from); \ | |
| 407 Uint32 *dst = (Uint32 *)(to); \ | |
| 408 for(i = 0; i < (int)(length); i++) { \ | |
| 409 Uint32 s = *src++; \ | |
| 410 Uint32 d = *dst; \ | |
| 411 Uint32 s1 = s & 0xff00ff; \ | |
| 412 Uint32 d1 = d & 0xff00ff; \ | |
| 413 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 414 s &= 0xff00; \ | |
| 415 d &= 0xff00; \ | |
| 416 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 417 *dst++ = d1 | d; \ | |
| 418 } \ | |
| 419 } while(0) | |
| 420 | |
| 421 /* | |
| 422 * For 16bpp pixels we can go a step further: put the middle component | |
| 423 * in the high 16 bits of a 32 bit word, and process all three RGB | |
| 424 * components at the same time. Since the smallest gap is here just | |
| 425 * 5 bits, we have to scale alpha down to 5 bits as well. | |
| 426 */ | |
| 427 #define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \ | |
| 428 do { \ | |
| 429 int i; \ | |
| 430 Uint16 *src = (Uint16 *)(from); \ | |
| 431 Uint16 *dst = (Uint16 *)(to); \ | |
|
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432 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 433 for(i = 0; i < (int)(length); i++) { \ |
| 434 Uint32 s = *src++; \ | |
| 435 Uint32 d = *dst; \ | |
| 436 s = (s | s << 16) & 0x07e0f81f; \ | |
| 437 d = (d | d << 16) & 0x07e0f81f; \ | |
|
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438 d += (s - d) * ALPHA >> 5; \ |
| 0 | 439 d &= 0x07e0f81f; \ |
| 440 *dst++ = d | d >> 16; \ | |
| 441 } \ | |
| 442 } while(0) | |
| 443 | |
| 444 #define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \ | |
| 445 do { \ | |
| 446 int i; \ | |
| 447 Uint16 *src = (Uint16 *)(from); \ | |
| 448 Uint16 *dst = (Uint16 *)(to); \ | |
|
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449 Uint32 ALPHA = alpha >> 3; \ |
| 0 | 450 for(i = 0; i < (int)(length); i++) { \ |
| 451 Uint32 s = *src++; \ | |
| 452 Uint32 d = *dst; \ | |
| 453 s = (s | s << 16) & 0x03e07c1f; \ | |
| 454 d = (d | d << 16) & 0x03e07c1f; \ | |
|
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455 d += (s - d) * ALPHA >> 5; \ |
| 0 | 456 d &= 0x03e07c1f; \ |
| 457 *dst++ = d | d >> 16; \ | |
| 458 } \ | |
| 459 } while(0) | |
| 460 | |
| 461 /* | |
| 462 * The general slow catch-all function, for remaining depths and formats | |
| 463 */ | |
| 464 #define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \ | |
| 465 do { \ | |
| 466 int i; \ | |
| 467 Uint8 *src = from; \ | |
| 468 Uint8 *dst = to; \ | |
| 469 for(i = 0; i < (int)(length); i++) { \ | |
| 470 Uint32 s, d; \ | |
| 471 unsigned rs, gs, bs, rd, gd, bd; \ | |
| 472 switch(bpp) { \ | |
| 473 case 2: \ | |
| 474 s = *(Uint16 *)src; \ | |
| 475 d = *(Uint16 *)dst; \ | |
| 476 break; \ | |
| 477 case 3: \ | |
| 478 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 479 s = (src[0] << 16) | (src[1] << 8) | src[2]; \ | |
| 480 d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \ | |
| 481 } else { \ | |
| 482 s = (src[2] << 16) | (src[1] << 8) | src[0]; \ | |
| 483 d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \ | |
| 484 } \ | |
| 485 break; \ | |
| 486 case 4: \ | |
| 487 s = *(Uint32 *)src; \ | |
| 488 d = *(Uint32 *)dst; \ | |
| 489 break; \ | |
| 490 } \ | |
| 491 RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \ | |
| 492 RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \ | |
| 493 rd += (rs - rd) * alpha >> 8; \ | |
| 494 gd += (gs - gd) * alpha >> 8; \ | |
| 495 bd += (bs - bd) * alpha >> 8; \ | |
| 496 PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \ | |
| 497 switch(bpp) { \ | |
| 498 case 2: \ | |
| 499 *(Uint16 *)dst = d; \ | |
| 500 break; \ | |
| 501 case 3: \ | |
| 502 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 503 dst[0] = d >> 16; \ | |
| 504 dst[1] = d >> 8; \ | |
| 505 dst[2] = d; \ | |
| 506 } else { \ | |
| 507 dst[0] = d; \ | |
| 508 dst[1] = d >> 8; \ | |
| 509 dst[2] = d >> 16; \ | |
| 510 } \ | |
| 511 break; \ | |
| 512 case 4: \ | |
| 513 *(Uint32 *)dst = d; \ | |
| 514 break; \ | |
| 515 } \ | |
| 516 src += bpp; \ | |
| 517 dst += bpp; \ | |
| 518 } \ | |
| 519 } while(0) | |
| 520 | |
|
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521 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
| 0 | 522 |
|
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523 #define ALPHA_BLIT32_888_50MMX(to, from, length, bpp, alpha) \ |
|
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524 do { \ |
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525 Uint32 *srcp = (Uint32 *)(from); \ |
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526 Uint32 *dstp = (Uint32 *)(to); \ |
|
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527 int i = 0x00fefefe; \ |
|
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528 movd_m2r(*(&i), mm4); \ |
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529 punpckldq_r2r(mm4, mm4); \ |
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530 i = 0x00010101; \ |
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531 movd_m2r(*(&i), mm3); \ |
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532 punpckldq_r2r(mm3, mm3); \ |
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533 i = (int)(length); \ |
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534 if( i & 1 ) { \ |
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535 Uint32 s = *srcp++; \ |
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536 Uint32 d = *dstp; \ |
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537 *dstp++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ |
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538 + (s & d & 0x00010101); \ |
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539 i--; \ |
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540 } \ |
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541 for(; i > 0; --i) { \ |
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542 movq_m2r((*dstp), mm2); /* dst -> mm2 */ \ |
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543 movq_r2r(mm2, mm6); /* dst -> mm6 */ \ |
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544 movq_m2r((*srcp), mm1); /* src -> mm1 */ \ |
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545 movq_r2r(mm1, mm5); /* src -> mm5 */ \ |
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546 pand_r2r(mm4, mm6); /* dst & 0x00fefefe -> mm6 */ \ |
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547 pand_r2r(mm4, mm5); /* src & 0x00fefefe -> mm5 */ \ |
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548 paddd_r2r(mm6, mm5); /* (dst & 0x00fefefe) + (dst & 0x00fefefe) -> mm5 */ \ |
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549 psrld_i2r(1, mm5); \ |
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550 pand_r2r(mm1, mm2); /* s & d -> mm2 */ \ |
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551 pand_r2r(mm3, mm2); /* s & d & 0x00010101 -> mm2 */ \ |
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552 paddd_r2r(mm5, mm2); \ |
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553 movq_r2m(mm2, (*dstp)); \ |
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554 dstp += 2; \ |
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555 srcp += 2; \ |
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556 i--; \ |
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557 } \ |
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558 emms(); \ |
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559 } while(0) |
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560 |
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561 #endif |
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562 |
| 0 | 563 /* |
| 564 * Special case: 50% alpha (alpha=128) | |
| 565 * This is treated specially because it can be optimized very well, and | |
| 566 * since it is good for many cases of semi-translucency. | |
| 567 * The theory is to do all three components at the same time: | |
| 568 * First zero the lowest bit of each component, which gives us room to | |
| 569 * add them. Then shift right and add the sum of the lowest bits. | |
| 570 */ | |
| 571 #define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \ | |
| 572 do { \ | |
| 573 int i; \ | |
| 574 Uint32 *src = (Uint32 *)(from); \ | |
| 575 Uint32 *dst = (Uint32 *)(to); \ | |
| 576 for(i = 0; i < (int)(length); i++) { \ | |
| 577 Uint32 s = *src++; \ | |
| 578 Uint32 d = *dst; \ | |
| 579 *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ | |
| 580 + (s & d & 0x00010101); \ | |
| 581 } \ | |
| 582 } while(0) | |
| 583 | |
| 584 /* | |
| 585 * For 16bpp, we can actually blend two pixels in parallel, if we take | |
| 586 * care to shift before we add, not after. | |
| 587 */ | |
| 588 | |
| 589 /* helper: blend a single 16 bit pixel at 50% */ | |
| 590 #define BLEND16_50(dst, src, mask) \ | |
| 591 do { \ | |
| 592 Uint32 s = *src++; \ | |
| 593 Uint32 d = *dst; \ | |
| 594 *dst++ = (((s & mask) + (d & mask)) >> 1) \ | |
| 595 + (s & d & (~mask & 0xffff)); \ | |
| 596 } while(0) | |
| 597 | |
| 598 /* basic 16bpp blender. mask is the pixels to keep when adding. */ | |
| 599 #define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \ | |
| 600 do { \ | |
| 601 unsigned n = (length); \ | |
| 602 Uint16 *src = (Uint16 *)(from); \ | |
| 603 Uint16 *dst = (Uint16 *)(to); \ | |
| 604 if(((unsigned long)src ^ (unsigned long)dst) & 3) { \ | |
| 605 /* source and destination not in phase, blit one by one */ \ | |
| 606 while(n--) \ | |
| 607 BLEND16_50(dst, src, mask); \ | |
| 608 } else { \ | |
| 609 if((unsigned long)src & 3) { \ | |
| 610 /* first odd pixel */ \ | |
| 611 BLEND16_50(dst, src, mask); \ | |
| 612 n--; \ | |
| 613 } \ | |
| 614 for(; n > 1; n -= 2) { \ | |
| 615 Uint32 s = *(Uint32 *)src; \ | |
| 616 Uint32 d = *(Uint32 *)dst; \ | |
| 617 *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \ | |
| 618 + ((d & (mask | mask << 16)) >> 1) \ | |
| 619 + (s & d & (~(mask | mask << 16))); \ | |
| 620 src += 2; \ | |
| 621 dst += 2; \ | |
| 622 } \ | |
| 623 if(n) \ | |
| 624 BLEND16_50(dst, src, mask); /* last odd pixel */ \ | |
| 625 } \ | |
| 626 } while(0) | |
| 627 | |
| 628 #define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \ | |
| 629 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de) | |
| 630 | |
| 631 #define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \ | |
| 632 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde) | |
| 633 | |
|
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634 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT) |
| 0 | 635 |
| 636 #define CHOOSE_BLIT(blitter, alpha, fmt) \ | |
| 637 do { \ | |
| 638 if(alpha == 255) { \ | |
| 639 switch(fmt->BytesPerPixel) { \ | |
| 640 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ | |
| 641 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ | |
| 642 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ | |
| 643 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ | |
| 644 } \ | |
| 645 } else { \ | |
| 646 switch(fmt->BytesPerPixel) { \ | |
| 647 case 1: \ | |
| 648 /* No 8bpp alpha blitting */ \ | |
| 649 break; \ | |
| 650 \ | |
| 651 case 2: \ | |
| 652 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ | |
| 653 case 0xffff: \ | |
| 654 if(fmt->Gmask == 0x07e0 \ | |
| 655 || fmt->Rmask == 0x07e0 \ | |
| 656 || fmt->Bmask == 0x07e0) { \ | |
| 657 if(alpha == 128) \ | |
| 658 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ | |
| 659 else { \ | |
|
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660 if((CPU_Flags()&MMX_CPU)!=0) \ |
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661 blitter(2, Uint8, ALPHA_BLIT16_565MMX); \ |
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662 else \ |
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663 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
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664 } \ |
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665 } else \ |
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666 goto general16; \ |
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667 break; \ |
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668 \ |
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669 case 0x7fff: \ |
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670 if(fmt->Gmask == 0x03e0 \ |
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671 || fmt->Rmask == 0x03e0 \ |
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672 || fmt->Bmask == 0x03e0) { \ |
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673 if(alpha == 128) \ |
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674 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ |
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675 else { \ |
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676 if((CPU_Flags()&MMX_CPU)!=0) \ |
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677 blitter(2, Uint8, ALPHA_BLIT16_555MMX); \ |
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678 else \ |
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679 blitter(2, Uint8, ALPHA_BLIT16_555); \ |
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680 } \ |
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681 break; \ |
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682 } \ |
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683 /* fallthrough */ \ |
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684 \ |
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685 default: \ |
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686 general16: \ |
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687 blitter(2, Uint8, ALPHA_BLIT_ANY); \ |
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688 } \ |
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689 break; \ |
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690 \ |
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691 case 3: \ |
|
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692 blitter(3, Uint8, ALPHA_BLIT_ANY); \ |
|
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693 break; \ |
|
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694 \ |
|
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695 case 4: \ |
|
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696 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ |
|
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697 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ |
|
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698 || fmt->Bmask == 0xff00)) { \ |
|
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699 if(alpha == 128) \ |
|
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700 { \ |
|
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701 if((CPU_Flags()&MMX_CPU)!=0) \ |
|
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702 blitter(4, Uint16, ALPHA_BLIT32_888_50MMX);\ |
|
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703 else \ |
|
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704 blitter(4, Uint16, ALPHA_BLIT32_888_50);\ |
|
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705 } \ |
|
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706 else \ |
|
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707 { \ |
|
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708 if((CPU_Flags()&MMX_CPU)!=0) \ |
|
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709 blitter(4, Uint16, ALPHA_BLIT32_888MMX);\ |
|
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710 else \ |
|
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711 blitter(4, Uint16, ALPHA_BLIT32_888); \ |
|
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712 } \ |
|
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713 } else \ |
|
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714 blitter(4, Uint16, ALPHA_BLIT_ANY); \ |
|
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715 break; \ |
|
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716 } \ |
|
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717 } \ |
|
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718 } while(0) |
|
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719 |
|
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720 #else |
|
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721 |
|
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722 #define CHOOSE_BLIT(blitter, alpha, fmt) \ |
|
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723 do { \ |
|
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724 if(alpha == 255) { \ |
|
5bb080d35049
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725 switch(fmt->BytesPerPixel) { \ |
|
5bb080d35049
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726 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ |
|
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727 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ |
|
5bb080d35049
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728 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ |
|
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|
729 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ |
|
5bb080d35049
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730 } \ |
|
5bb080d35049
Date: Tue, 19 Aug 2003 17:57:00 +0200
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731 } else { \ |
|
5bb080d35049
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|
732 switch(fmt->BytesPerPixel) { \ |
|
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733 case 1: \ |
|
5bb080d35049
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|
734 /* No 8bpp alpha blitting */ \ |
|
5bb080d35049
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|
735 break; \ |
|
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|
736 \ |
|
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Date: Tue, 19 Aug 2003 17:57:00 +0200
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737 case 2: \ |
|
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|
738 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ |
|
5bb080d35049
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739 case 0xffff: \ |
|
5bb080d35049
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|
740 if(fmt->Gmask == 0x07e0 \ |
|
5bb080d35049
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|
741 || fmt->Rmask == 0x07e0 \ |
|
5bb080d35049
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742 || fmt->Bmask == 0x07e0) { \ |
|
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|
743 if(alpha == 128) \ |
|
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744 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ |
|
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745 else { \ |
| 0 | 746 blitter(2, Uint8, ALPHA_BLIT16_565); \ |
| 747 } \ | |
| 748 } else \ | |
| 749 goto general16; \ | |
| 750 break; \ | |
| 751 \ | |
| 752 case 0x7fff: \ | |
| 753 if(fmt->Gmask == 0x03e0 \ | |
| 754 || fmt->Rmask == 0x03e0 \ | |
| 755 || fmt->Bmask == 0x03e0) { \ | |
| 756 if(alpha == 128) \ | |
| 757 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ | |
| 758 else { \ | |
| 759 blitter(2, Uint8, ALPHA_BLIT16_555); \ | |
| 760 } \ | |
| 761 break; \ | |
| 762 } \ | |
| 763 /* fallthrough */ \ | |
| 764 \ | |
| 765 default: \ | |
| 766 general16: \ | |
| 767 blitter(2, Uint8, ALPHA_BLIT_ANY); \ | |
| 768 } \ | |
| 769 break; \ | |
| 770 \ | |
| 771 case 3: \ | |
| 772 blitter(3, Uint8, ALPHA_BLIT_ANY); \ | |
| 773 break; \ | |
| 774 \ | |
| 775 case 4: \ | |
| 776 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ | |
| 777 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ | |
| 778 || fmt->Bmask == 0xff00)) { \ | |
| 779 if(alpha == 128) \ | |
| 780 blitter(4, Uint16, ALPHA_BLIT32_888_50); \ | |
| 781 else \ | |
| 782 blitter(4, Uint16, ALPHA_BLIT32_888); \ | |
| 783 } else \ | |
| 784 blitter(4, Uint16, ALPHA_BLIT_ANY); \ | |
| 785 break; \ | |
| 786 } \ | |
| 787 } \ | |
| 788 } while(0) | |
| 789 | |
|
689
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|
790 #endif |
| 0 | 791 |
| 792 /* | |
| 793 * This takes care of the case when the surface is clipped on the left and/or | |
| 794 * right. Top clipping has already been taken care of. | |
| 795 */ | |
| 796 static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 797 Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha) | |
| 798 { | |
| 799 SDL_PixelFormat *fmt = dst->format; | |
| 800 | |
| 801 #define RLECLIPBLIT(bpp, Type, do_blit) \ | |
| 802 do { \ | |
| 803 int linecount = srcrect->h; \ | |
| 804 int ofs = 0; \ | |
| 805 int left = srcrect->x; \ | |
| 806 int right = left + srcrect->w; \ | |
| 807 dstbuf -= left * bpp; \ | |
| 808 for(;;) { \ | |
| 809 int run; \ | |
| 810 ofs += *(Type *)srcbuf; \ | |
| 811 run = ((Type *)srcbuf)[1]; \ | |
| 812 srcbuf += 2 * sizeof(Type); \ | |
| 813 if(run) { \ | |
| 814 /* clip to left and right borders */ \ | |
| 815 if(ofs < right) { \ | |
| 816 int start = 0; \ | |
| 817 int len = run; \ | |
| 818 int startcol; \ | |
| 819 if(left - ofs > 0) { \ | |
| 820 start = left - ofs; \ | |
| 821 len -= start; \ | |
| 822 if(len <= 0) \ | |
| 823 goto nocopy ## bpp ## do_blit; \ | |
| 824 } \ | |
| 825 startcol = ofs + start; \ | |
| 826 if(len > right - startcol) \ | |
| 827 len = right - startcol; \ | |
| 828 do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \ | |
| 829 len, bpp, alpha); \ | |
| 830 } \ | |
| 831 nocopy ## bpp ## do_blit: \ | |
| 832 srcbuf += run * bpp; \ | |
| 833 ofs += run; \ | |
| 834 } else if(!ofs) \ | |
| 835 break; \ | |
| 836 if(ofs == w) { \ | |
| 837 ofs = 0; \ | |
| 838 dstbuf += dst->pitch; \ | |
| 839 if(!--linecount) \ | |
| 840 break; \ | |
| 841 } \ | |
| 842 } \ | |
| 843 } while(0) | |
| 844 | |
| 845 CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); | |
| 846 | |
| 847 #undef RLECLIPBLIT | |
| 848 | |
| 849 } | |
| 850 | |
| 851 | |
| 852 /* blit a colorkeyed RLE surface */ | |
| 853 int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 854 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 855 { | |
| 856 Uint8 *dstbuf; | |
| 857 Uint8 *srcbuf; | |
| 858 int x, y; | |
| 859 int w = src->w; | |
| 860 unsigned alpha; | |
| 861 | |
| 862 /* Lock the destination if necessary */ | |
|
526
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863 if ( SDL_MUSTLOCK(dst) ) { |
|
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|
864 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 865 return(-1); |
| 866 } | |
| 867 } | |
| 868 | |
| 869 /* Set up the source and destination pointers */ | |
| 870 x = dstrect->x; | |
| 871 y = dstrect->y; | |
|
526
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|
872 dstbuf = (Uint8 *)dst->pixels |
| 0 | 873 + y * dst->pitch + x * src->format->BytesPerPixel; |
| 874 srcbuf = (Uint8 *)src->map->sw_data->aux_data; | |
| 875 | |
| 876 { | |
| 877 /* skip lines at the top if neccessary */ | |
| 878 int vskip = srcrect->y; | |
| 879 int ofs = 0; | |
| 880 if(vskip) { | |
| 881 | |
| 882 #define RLESKIP(bpp, Type) \ | |
| 883 for(;;) { \ | |
| 884 int run; \ | |
| 885 ofs += *(Type *)srcbuf; \ | |
| 886 run = ((Type *)srcbuf)[1]; \ | |
| 887 srcbuf += sizeof(Type) * 2; \ | |
| 888 if(run) { \ | |
| 889 srcbuf += run * bpp; \ | |
| 890 ofs += run; \ | |
| 891 } else if(!ofs) \ | |
| 892 goto done; \ | |
| 893 if(ofs == w) { \ | |
| 894 ofs = 0; \ | |
| 895 if(!--vskip) \ | |
| 896 break; \ | |
| 897 } \ | |
| 898 } | |
| 899 | |
| 900 switch(src->format->BytesPerPixel) { | |
| 901 case 1: RLESKIP(1, Uint8); break; | |
| 902 case 2: RLESKIP(2, Uint8); break; | |
| 903 case 3: RLESKIP(3, Uint8); break; | |
| 904 case 4: RLESKIP(4, Uint16); break; | |
| 905 } | |
| 906 | |
| 907 #undef RLESKIP | |
| 908 | |
| 909 } | |
| 910 } | |
| 911 | |
| 912 alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 913 ? src->format->alpha : 255; | |
| 914 /* if left or right edge clipping needed, call clip blit */ | |
| 915 if ( srcrect->x || srcrect->w != src->w ) { | |
| 916 RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); | |
| 917 } else { | |
| 918 SDL_PixelFormat *fmt = src->format; | |
| 919 | |
| 920 #define RLEBLIT(bpp, Type, do_blit) \ | |
| 921 do { \ | |
| 922 int linecount = srcrect->h; \ | |
| 923 int ofs = 0; \ | |
| 924 for(;;) { \ | |
| 925 unsigned run; \ | |
| 926 ofs += *(Type *)srcbuf; \ | |
| 927 run = ((Type *)srcbuf)[1]; \ | |
| 928 srcbuf += 2 * sizeof(Type); \ | |
| 929 if(run) { \ | |
| 930 do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \ | |
| 931 srcbuf += run * bpp; \ | |
| 932 ofs += run; \ | |
| 933 } else if(!ofs) \ | |
| 934 break; \ | |
| 935 if(ofs == w) { \ | |
| 936 ofs = 0; \ | |
| 937 dstbuf += dst->pitch; \ | |
| 938 if(!--linecount) \ | |
| 939 break; \ | |
| 940 } \ | |
| 941 } \ | |
| 942 } while(0) | |
| 943 | |
| 944 CHOOSE_BLIT(RLEBLIT, alpha, fmt); | |
| 945 | |
| 946 #undef RLEBLIT | |
| 947 } | |
| 948 | |
| 949 done: | |
| 950 /* Unlock the destination if necessary */ | |
|
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|
951 if ( SDL_MUSTLOCK(dst) ) { |
|
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|
952 SDL_UnlockSurface(dst); |
| 0 | 953 } |
| 954 return(0); | |
| 955 } | |
| 956 | |
| 957 #undef OPAQUE_BLIT | |
| 958 | |
| 959 /* | |
| 960 * Per-pixel blitting macros for translucent pixels: | |
| 961 * These use the same techniques as the per-surface blitting macros | |
| 962 */ | |
| 963 | |
| 964 /* | |
| 965 * For 32bpp pixels, we have made sure the alpha is stored in the top | |
| 966 * 8 bits, so proceed as usual | |
| 967 */ | |
| 968 #define BLIT_TRANSL_888(src, dst) \ | |
| 969 do { \ | |
| 970 Uint32 s = src; \ | |
| 971 Uint32 d = dst; \ | |
| 972 unsigned alpha = s >> 24; \ | |
| 973 Uint32 s1 = s & 0xff00ff; \ | |
| 974 Uint32 d1 = d & 0xff00ff; \ | |
| 975 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 976 s &= 0xff00; \ | |
| 977 d &= 0xff00; \ | |
| 978 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 979 dst = d1 | d; \ | |
| 980 } while(0) | |
| 981 | |
| 982 /* | |
| 983 * For 16bpp pixels, we have stored the 5 most significant alpha bits in | |
| 984 * bits 5-10. As before, we can process all 3 RGB components at the same time. | |
| 985 */ | |
| 986 #define BLIT_TRANSL_565(src, dst) \ | |
| 987 do { \ | |
| 988 Uint32 s = src; \ | |
| 989 Uint32 d = dst; \ | |
| 990 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 991 s &= 0x07e0f81f; \ | |
| 992 d = (d | d << 16) & 0x07e0f81f; \ | |
| 993 d += (s - d) * alpha >> 5; \ | |
| 994 d &= 0x07e0f81f; \ | |
| 995 dst = d | d >> 16; \ | |
| 996 } while(0) | |
| 997 | |
| 998 #define BLIT_TRANSL_555(src, dst) \ | |
| 999 do { \ | |
| 1000 Uint32 s = src; \ | |
| 1001 Uint32 d = dst; \ | |
| 1002 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 1003 s &= 0x03e07c1f; \ | |
| 1004 d = (d | d << 16) & 0x03e07c1f; \ | |
| 1005 d += (s - d) * alpha >> 5; \ | |
| 1006 d &= 0x03e07c1f; \ | |
| 1007 dst = d | d >> 16; \ | |
| 1008 } while(0) | |
| 1009 | |
| 1010 /* used to save the destination format in the encoding. Designed to be | |
| 1011 macro-compatible with SDL_PixelFormat but without the unneeded fields */ | |
| 1012 typedef struct { | |
| 1013 Uint8 BytesPerPixel; | |
| 1014 Uint8 Rloss; | |
| 1015 Uint8 Gloss; | |
| 1016 Uint8 Bloss; | |
| 1017 Uint8 Rshift; | |
| 1018 Uint8 Gshift; | |
| 1019 Uint8 Bshift; | |
| 1020 Uint8 Ashift; | |
| 1021 Uint32 Rmask; | |
| 1022 Uint32 Gmask; | |
| 1023 Uint32 Bmask; | |
| 1024 Uint32 Amask; | |
| 1025 } RLEDestFormat; | |
| 1026 | |
| 1027 /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ | |
| 1028 static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 1029 Uint8 *dstbuf, SDL_Rect *srcrect) | |
| 1030 { | |
| 1031 SDL_PixelFormat *df = dst->format; | |
| 1032 /* | |
| 1033 * clipped blitter: Ptype is the destination pixel type, | |
| 1034 * Ctype the translucent count type, and do_blend the macro | |
| 1035 * to blend one pixel. | |
| 1036 */ | |
| 1037 #define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \ | |
| 1038 do { \ | |
| 1039 int linecount = srcrect->h; \ | |
| 1040 int left = srcrect->x; \ | |
| 1041 int right = left + srcrect->w; \ | |
| 1042 dstbuf -= left * sizeof(Ptype); \ | |
| 1043 do { \ | |
| 1044 int ofs = 0; \ | |
| 1045 /* blit opaque pixels on one line */ \ | |
| 1046 do { \ | |
| 1047 unsigned run; \ | |
| 1048 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1049 run = ((Ctype *)srcbuf)[1]; \ | |
| 1050 srcbuf += 2 * sizeof(Ctype); \ | |
| 1051 if(run) { \ | |
| 1052 /* clip to left and right borders */ \ | |
| 1053 int cofs = ofs; \ | |
| 1054 int crun = run; \ | |
| 1055 if(left - cofs > 0) { \ | |
| 1056 crun -= left - cofs; \ | |
| 1057 cofs = left; \ | |
| 1058 } \ | |
| 1059 if(crun > right - cofs) \ | |
| 1060 crun = right - cofs; \ | |
| 1061 if(crun > 0) \ | |
|
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1062 PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \ |
| 0 | 1063 srcbuf + (cofs - ofs) * sizeof(Ptype), \ |
|
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|
1064 (unsigned)crun, sizeof(Ptype)); \ |
| 0 | 1065 srcbuf += run * sizeof(Ptype); \ |
| 1066 ofs += run; \ | |
| 1067 } else if(!ofs) \ | |
| 1068 return; \ | |
| 1069 } while(ofs < w); \ | |
| 1070 /* skip padding if necessary */ \ | |
| 1071 if(sizeof(Ptype) == 2) \ | |
| 1072 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1073 /* blit translucent pixels on the same line */ \ | |
| 1074 ofs = 0; \ | |
| 1075 do { \ | |
| 1076 unsigned run; \ | |
| 1077 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1078 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1079 srcbuf += 4; \ | |
| 1080 if(run) { \ | |
| 1081 /* clip to left and right borders */ \ | |
| 1082 int cofs = ofs; \ | |
| 1083 int crun = run; \ | |
| 1084 if(left - cofs > 0) { \ | |
| 1085 crun -= left - cofs; \ | |
| 1086 cofs = left; \ | |
| 1087 } \ | |
| 1088 if(crun > right - cofs) \ | |
| 1089 crun = right - cofs; \ | |
| 1090 if(crun > 0) { \ | |
| 1091 Ptype *dst = (Ptype *)dstbuf + cofs; \ | |
| 1092 Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \ | |
| 1093 int i; \ | |
| 1094 for(i = 0; i < crun; i++) \ | |
| 1095 do_blend(src[i], dst[i]); \ | |
| 1096 } \ | |
| 1097 srcbuf += run * 4; \ | |
| 1098 ofs += run; \ | |
| 1099 } \ | |
| 1100 } while(ofs < w); \ | |
| 1101 dstbuf += dst->pitch; \ | |
| 1102 } while(--linecount); \ | |
| 1103 } while(0) | |
| 1104 | |
| 1105 switch(df->BytesPerPixel) { | |
| 1106 case 2: | |
| 1107 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1108 || df->Bmask == 0x07e0) | |
| 1109 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1110 else | |
| 1111 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1112 break; | |
| 1113 case 4: | |
| 1114 RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1115 break; | |
| 1116 } | |
| 1117 } | |
| 1118 | |
| 1119 /* blit a pixel-alpha RLE surface */ | |
| 1120 int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 1121 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 1122 { | |
| 1123 int x, y; | |
| 1124 int w = src->w; | |
| 1125 Uint8 *srcbuf, *dstbuf; | |
| 1126 SDL_PixelFormat *df = dst->format; | |
| 1127 | |
| 1128 /* Lock the destination if necessary */ | |
|
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1129 if ( SDL_MUSTLOCK(dst) ) { |
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1130 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 1131 return -1; |
| 1132 } | |
| 1133 } | |
| 1134 | |
| 1135 x = dstrect->x; | |
| 1136 y = dstrect->y; | |
|
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1137 dstbuf = (Uint8 *)dst->pixels |
| 0 | 1138 + y * dst->pitch + x * df->BytesPerPixel; |
| 1139 srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat); | |
| 1140 | |
| 1141 { | |
| 1142 /* skip lines at the top if necessary */ | |
| 1143 int vskip = srcrect->y; | |
| 1144 if(vskip) { | |
| 1145 int ofs; | |
| 1146 if(df->BytesPerPixel == 2) { | |
| 1147 /* the 16/32 interleaved format */ | |
| 1148 do { | |
| 1149 /* skip opaque line */ | |
| 1150 ofs = 0; | |
| 1151 do { | |
| 1152 int run; | |
| 1153 ofs += srcbuf[0]; | |
| 1154 run = srcbuf[1]; | |
| 1155 srcbuf += 2; | |
| 1156 if(run) { | |
| 1157 srcbuf += 2 * run; | |
| 1158 ofs += run; | |
| 1159 } else if(!ofs) | |
| 1160 goto done; | |
| 1161 } while(ofs < w); | |
| 1162 | |
| 1163 /* skip padding */ | |
| 1164 srcbuf += (unsigned long)srcbuf & 2; | |
| 1165 | |
| 1166 /* skip translucent line */ | |
| 1167 ofs = 0; | |
| 1168 do { | |
| 1169 int run; | |
| 1170 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1171 run = ((Uint16 *)srcbuf)[1]; | |
| 1172 srcbuf += 4 * (run + 1); | |
| 1173 ofs += run; | |
| 1174 } while(ofs < w); | |
| 1175 } while(--vskip); | |
| 1176 } else { | |
| 1177 /* the 32/32 interleaved format */ | |
| 1178 vskip <<= 1; /* opaque and translucent have same format */ | |
| 1179 do { | |
| 1180 ofs = 0; | |
| 1181 do { | |
| 1182 int run; | |
| 1183 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1184 run = ((Uint16 *)srcbuf)[1]; | |
| 1185 srcbuf += 4; | |
| 1186 if(run) { | |
| 1187 srcbuf += 4 * run; | |
| 1188 ofs += run; | |
| 1189 } else if(!ofs) | |
| 1190 goto done; | |
| 1191 } while(ofs < w); | |
| 1192 } while(--vskip); | |
| 1193 } | |
| 1194 } | |
| 1195 } | |
| 1196 | |
| 1197 /* if left or right edge clipping needed, call clip blit */ | |
| 1198 if(srcrect->x || srcrect->w != src->w) { | |
| 1199 RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect); | |
| 1200 } else { | |
| 1201 | |
| 1202 /* | |
| 1203 * non-clipped blitter. Ptype is the destination pixel type, | |
| 1204 * Ctype the translucent count type, and do_blend the | |
| 1205 * macro to blend one pixel. | |
| 1206 */ | |
| 1207 #define RLEALPHABLIT(Ptype, Ctype, do_blend) \ | |
| 1208 do { \ | |
| 1209 int linecount = srcrect->h; \ | |
| 1210 do { \ | |
| 1211 int ofs = 0; \ | |
| 1212 /* blit opaque pixels on one line */ \ | |
| 1213 do { \ | |
| 1214 unsigned run; \ | |
| 1215 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 1216 run = ((Ctype *)srcbuf)[1]; \ | |
| 1217 srcbuf += 2 * sizeof(Ctype); \ | |
| 1218 if(run) { \ | |
|
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1219 PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \ |
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|
1220 run, sizeof(Ptype)); \ |
| 0 | 1221 srcbuf += run * sizeof(Ptype); \ |
| 1222 ofs += run; \ | |
| 1223 } else if(!ofs) \ | |
| 1224 goto done; \ | |
| 1225 } while(ofs < w); \ | |
| 1226 /* skip padding if necessary */ \ | |
| 1227 if(sizeof(Ptype) == 2) \ | |
| 1228 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 1229 /* blit translucent pixels on the same line */ \ | |
| 1230 ofs = 0; \ | |
| 1231 do { \ | |
| 1232 unsigned run; \ | |
| 1233 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 1234 run = ((Uint16 *)srcbuf)[1]; \ | |
| 1235 srcbuf += 4; \ | |
| 1236 if(run) { \ | |
| 1237 Ptype *dst = (Ptype *)dstbuf + ofs; \ | |
| 1238 unsigned i; \ | |
| 1239 for(i = 0; i < run; i++) { \ | |
| 1240 Uint32 src = *(Uint32 *)srcbuf; \ | |
| 1241 do_blend(src, *dst); \ | |
| 1242 srcbuf += 4; \ | |
| 1243 dst++; \ | |
| 1244 } \ | |
| 1245 ofs += run; \ | |
| 1246 } \ | |
| 1247 } while(ofs < w); \ | |
| 1248 dstbuf += dst->pitch; \ | |
| 1249 } while(--linecount); \ | |
| 1250 } while(0) | |
| 1251 | |
| 1252 switch(df->BytesPerPixel) { | |
| 1253 case 2: | |
| 1254 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 1255 || df->Bmask == 0x07e0) | |
| 1256 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 1257 else | |
| 1258 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 1259 break; | |
| 1260 case 4: | |
| 1261 RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 1262 break; | |
| 1263 } | |
| 1264 } | |
| 1265 | |
| 1266 done: | |
| 1267 /* Unlock the destination if necessary */ | |
|
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1268 if ( SDL_MUSTLOCK(dst) ) { |
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1269 SDL_UnlockSurface(dst); |
| 0 | 1270 } |
| 1271 return 0; | |
| 1272 } | |
| 1273 | |
| 1274 /* | |
| 1275 * Auxiliary functions: | |
| 1276 * The encoding functions take 32bpp rgb + a, and | |
| 1277 * return the number of bytes copied to the destination. | |
| 1278 * The decoding functions copy to 32bpp rgb + a, and | |
| 1279 * return the number of bytes copied from the source. | |
| 1280 * These are only used in the encoder and un-RLE code and are therefore not | |
| 1281 * highly optimised. | |
| 1282 */ | |
| 1283 | |
| 1284 /* encode 32bpp rgb + a into 16bpp rgb, losing alpha */ | |
| 1285 static int copy_opaque_16(void *dst, Uint32 *src, int n, | |
| 1286 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1287 { | |
| 1288 int i; | |
| 1289 Uint16 *d = dst; | |
| 1290 for(i = 0; i < n; i++) { | |
| 1291 unsigned r, g, b; | |
| 1292 RGB_FROM_PIXEL(*src, sfmt, r, g, b); | |
| 1293 PIXEL_FROM_RGB(*d, dfmt, r, g, b); | |
| 1294 src++; | |
| 1295 d++; | |
| 1296 } | |
| 1297 return n * 2; | |
| 1298 } | |
| 1299 | |
| 1300 /* decode opaque pixels from 16bpp to 32bpp rgb + a */ | |
| 1301 static int uncopy_opaque_16(Uint32 *dst, void *src, int n, | |
| 1302 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1303 { | |
| 1304 int i; | |
| 1305 Uint16 *s = src; | |
| 1306 unsigned alpha = dfmt->Amask ? 255 : 0; | |
| 1307 for(i = 0; i < n; i++) { | |
| 1308 unsigned r, g, b; | |
| 1309 RGB_FROM_PIXEL(*s, sfmt, r, g, b); | |
| 1310 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha); | |
| 1311 s++; | |
| 1312 dst++; | |
| 1313 } | |
| 1314 return n * 2; | |
| 1315 } | |
| 1316 | |
| 1317 | |
| 1318 | |
| 1319 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */ | |
| 1320 static int copy_transl_565(void *dst, Uint32 *src, int n, | |
| 1321 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1322 { | |
| 1323 int i; | |
| 1324 Uint32 *d = dst; | |
| 1325 for(i = 0; i < n; i++) { | |
| 1326 unsigned r, g, b, a; | |
| 1327 Uint16 pix; | |
| 1328 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1329 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1330 *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0); | |
| 1331 src++; | |
| 1332 d++; | |
| 1333 } | |
| 1334 return n * 4; | |
| 1335 } | |
| 1336 | |
| 1337 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */ | |
| 1338 static int copy_transl_555(void *dst, Uint32 *src, int n, | |
| 1339 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1340 { | |
| 1341 int i; | |
| 1342 Uint32 *d = dst; | |
| 1343 for(i = 0; i < n; i++) { | |
| 1344 unsigned r, g, b, a; | |
| 1345 Uint16 pix; | |
| 1346 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1347 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 1348 *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0); | |
| 1349 src++; | |
| 1350 d++; | |
| 1351 } | |
| 1352 return n * 4; | |
| 1353 } | |
| 1354 | |
| 1355 /* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */ | |
| 1356 static int uncopy_transl_16(Uint32 *dst, void *src, int n, | |
| 1357 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1358 { | |
| 1359 int i; | |
| 1360 Uint32 *s = src; | |
| 1361 for(i = 0; i < n; i++) { | |
| 1362 unsigned r, g, b, a; | |
| 1363 Uint32 pix = *s++; | |
| 1364 a = (pix & 0x3e0) >> 2; | |
| 1365 pix = (pix & ~0x3e0) | pix >> 16; | |
| 1366 RGB_FROM_PIXEL(pix, sfmt, r, g, b); | |
| 1367 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1368 dst++; | |
| 1369 } | |
| 1370 return n * 4; | |
| 1371 } | |
| 1372 | |
| 1373 /* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1374 static int copy_32(void *dst, Uint32 *src, int n, | |
| 1375 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1376 { | |
| 1377 int i; | |
| 1378 Uint32 *d = dst; | |
| 1379 for(i = 0; i < n; i++) { | |
| 1380 unsigned r, g, b, a; | |
| 1381 Uint32 pixel; | |
| 1382 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 1383 PIXEL_FROM_RGB(pixel, dfmt, r, g, b); | |
| 1384 *d++ = pixel | a << 24; | |
| 1385 src++; | |
| 1386 } | |
| 1387 return n * 4; | |
| 1388 } | |
| 1389 | |
| 1390 /* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 1391 static int uncopy_32(Uint32 *dst, void *src, int n, | |
| 1392 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 1393 { | |
| 1394 int i; | |
| 1395 Uint32 *s = src; | |
| 1396 for(i = 0; i < n; i++) { | |
| 1397 unsigned r, g, b, a; | |
| 1398 Uint32 pixel = *s++; | |
| 1399 RGB_FROM_PIXEL(pixel, sfmt, r, g, b); | |
| 1400 a = pixel >> 24; | |
| 1401 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1402 dst++; | |
| 1403 } | |
| 1404 return n * 4; | |
| 1405 } | |
| 1406 | |
| 1407 #define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255) | |
| 1408 | |
| 1409 #define ISTRANSL(pixel, fmt) \ | |
| 1410 ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U) | |
| 1411 | |
| 1412 /* convert surface to be quickly alpha-blittable onto dest, if possible */ | |
| 1413 static int RLEAlphaSurface(SDL_Surface *surface) | |
| 1414 { | |
| 1415 SDL_Surface *dest; | |
| 1416 SDL_PixelFormat *df; | |
| 1417 int maxsize = 0; | |
| 1418 int max_opaque_run; | |
| 1419 int max_transl_run = 65535; | |
| 1420 unsigned masksum; | |
| 1421 Uint8 *rlebuf, *dst; | |
| 1422 int (*copy_opaque)(void *, Uint32 *, int, | |
| 1423 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1424 int (*copy_transl)(void *, Uint32 *, int, | |
| 1425 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1426 | |
| 1427 dest = surface->map->dst; | |
| 1428 if(!dest) | |
| 1429 return -1; | |
| 1430 df = dest->format; | |
| 1431 if(surface->format->BitsPerPixel != 32) | |
| 1432 return -1; /* only 32bpp source supported */ | |
| 1433 | |
| 1434 /* find out whether the destination is one we support, | |
| 1435 and determine the max size of the encoded result */ | |
| 1436 masksum = df->Rmask | df->Gmask | df->Bmask; | |
| 1437 switch(df->BytesPerPixel) { | |
| 1438 case 2: | |
| 1439 /* 16bpp: only support 565 and 555 formats */ | |
| 1440 switch(masksum) { | |
| 1441 case 0xffff: | |
| 1442 if(df->Gmask == 0x07e0 | |
| 1443 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) { | |
| 1444 copy_opaque = copy_opaque_16; | |
| 1445 copy_transl = copy_transl_565; | |
| 1446 } else | |
| 1447 return -1; | |
| 1448 break; | |
| 1449 case 0x7fff: | |
| 1450 if(df->Gmask == 0x03e0 | |
| 1451 || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) { | |
| 1452 copy_opaque = copy_opaque_16; | |
| 1453 copy_transl = copy_transl_555; | |
| 1454 } else | |
| 1455 return -1; | |
| 1456 break; | |
| 1457 default: | |
| 1458 return -1; | |
| 1459 } | |
| 1460 max_opaque_run = 255; /* runs stored as bytes */ | |
| 1461 | |
| 1462 /* worst case is alternating opaque and translucent pixels, | |
| 1463 with room for alignment padding between lines */ | |
| 1464 maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2; | |
| 1465 break; | |
| 1466 case 4: | |
| 1467 if(masksum != 0x00ffffff) | |
| 1468 return -1; /* requires unused high byte */ | |
| 1469 copy_opaque = copy_32; | |
| 1470 copy_transl = copy_32; | |
| 1471 max_opaque_run = 255; /* runs stored as short ints */ | |
| 1472 | |
| 1473 /* worst case is alternating opaque and translucent pixels */ | |
| 1474 maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4; | |
| 1475 break; | |
| 1476 default: | |
| 1477 return -1; /* anything else unsupported right now */ | |
| 1478 } | |
| 1479 | |
| 1480 maxsize += sizeof(RLEDestFormat); | |
| 1481 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1482 if(!rlebuf) { | |
| 1483 SDL_OutOfMemory(); | |
| 1484 return -1; | |
| 1485 } | |
| 1486 { | |
| 1487 /* save the destination format so we can undo the encoding later */ | |
| 1488 RLEDestFormat *r = (RLEDestFormat *)rlebuf; | |
| 1489 r->BytesPerPixel = df->BytesPerPixel; | |
| 1490 r->Rloss = df->Rloss; | |
| 1491 r->Gloss = df->Gloss; | |
| 1492 r->Bloss = df->Bloss; | |
| 1493 r->Rshift = df->Rshift; | |
| 1494 r->Gshift = df->Gshift; | |
| 1495 r->Bshift = df->Bshift; | |
| 1496 r->Ashift = df->Ashift; | |
| 1497 r->Rmask = df->Rmask; | |
| 1498 r->Gmask = df->Gmask; | |
| 1499 r->Bmask = df->Bmask; | |
| 1500 r->Amask = df->Amask; | |
| 1501 } | |
| 1502 dst = rlebuf + sizeof(RLEDestFormat); | |
| 1503 | |
| 1504 /* Do the actual encoding */ | |
| 1505 { | |
| 1506 int x, y; | |
| 1507 int h = surface->h, w = surface->w; | |
| 1508 SDL_PixelFormat *sf = surface->format; | |
|
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297
diff
changeset
|
1509 Uint32 *src = (Uint32 *)surface->pixels; |
| 0 | 1510 Uint8 *lastline = dst; /* end of last non-blank line */ |
| 1511 | |
| 1512 /* opaque counts are 8 or 16 bits, depending on target depth */ | |
| 1513 #define ADD_OPAQUE_COUNTS(n, m) \ | |
| 1514 if(df->BytesPerPixel == 4) { \ | |
| 1515 ((Uint16 *)dst)[0] = n; \ | |
| 1516 ((Uint16 *)dst)[1] = m; \ | |
| 1517 dst += 4; \ | |
| 1518 } else { \ | |
| 1519 dst[0] = n; \ | |
| 1520 dst[1] = m; \ | |
| 1521 dst += 2; \ | |
| 1522 } | |
| 1523 | |
| 1524 /* translucent counts are always 16 bit */ | |
| 1525 #define ADD_TRANSL_COUNTS(n, m) \ | |
| 1526 (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4) | |
| 1527 | |
| 1528 for(y = 0; y < h; y++) { | |
| 1529 int runstart, skipstart; | |
| 1530 int blankline = 0; | |
| 1531 /* First encode all opaque pixels of a scan line */ | |
| 1532 x = 0; | |
| 1533 do { | |
| 1534 int run, skip, len; | |
| 1535 skipstart = x; | |
| 1536 while(x < w && !ISOPAQUE(src[x], sf)) | |
| 1537 x++; | |
| 1538 runstart = x; | |
| 1539 while(x < w && ISOPAQUE(src[x], sf)) | |
| 1540 x++; | |
| 1541 skip = runstart - skipstart; | |
| 1542 if(skip == w) | |
| 1543 blankline = 1; | |
| 1544 run = x - runstart; | |
| 1545 while(skip > max_opaque_run) { | |
| 1546 ADD_OPAQUE_COUNTS(max_opaque_run, 0); | |
| 1547 skip -= max_opaque_run; | |
| 1548 } | |
| 1549 len = MIN(run, max_opaque_run); | |
| 1550 ADD_OPAQUE_COUNTS(skip, len); | |
| 1551 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1552 runstart += len; | |
| 1553 run -= len; | |
| 1554 while(run) { | |
| 1555 len = MIN(run, max_opaque_run); | |
| 1556 ADD_OPAQUE_COUNTS(0, len); | |
| 1557 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1558 runstart += len; | |
| 1559 run -= len; | |
| 1560 } | |
| 1561 } while(x < w); | |
| 1562 | |
| 1563 /* Make sure the next output address is 32-bit aligned */ | |
| 1564 dst += (unsigned long)dst & 2; | |
| 1565 | |
| 1566 /* Next, encode all translucent pixels of the same scan line */ | |
| 1567 x = 0; | |
| 1568 do { | |
| 1569 int run, skip, len; | |
| 1570 skipstart = x; | |
| 1571 while(x < w && !ISTRANSL(src[x], sf)) | |
| 1572 x++; | |
| 1573 runstart = x; | |
| 1574 while(x < w && ISTRANSL(src[x], sf)) | |
| 1575 x++; | |
| 1576 skip = runstart - skipstart; | |
| 1577 blankline &= (skip == w); | |
| 1578 run = x - runstart; | |
| 1579 while(skip > max_transl_run) { | |
| 1580 ADD_TRANSL_COUNTS(max_transl_run, 0); | |
| 1581 skip -= max_transl_run; | |
| 1582 } | |
| 1583 len = MIN(run, max_transl_run); | |
| 1584 ADD_TRANSL_COUNTS(skip, len); | |
| 1585 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1586 runstart += len; | |
| 1587 run -= len; | |
| 1588 while(run) { | |
| 1589 len = MIN(run, max_transl_run); | |
| 1590 ADD_TRANSL_COUNTS(0, len); | |
| 1591 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1592 runstart += len; | |
| 1593 run -= len; | |
| 1594 } | |
| 1595 if(!blankline) | |
| 1596 lastline = dst; | |
| 1597 } while(x < w); | |
| 1598 | |
| 1599 src += surface->pitch >> 2; | |
| 1600 } | |
| 1601 dst = lastline; /* back up past trailing blank lines */ | |
| 1602 ADD_OPAQUE_COUNTS(0, 0); | |
| 1603 } | |
| 1604 | |
| 1605 #undef ADD_OPAQUE_COUNTS | |
| 1606 #undef ADD_TRANSL_COUNTS | |
| 1607 | |
| 1608 /* Now that we have it encoded, release the original pixels */ | |
| 1609 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1610 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1611 free( surface->pixels ); | |
| 1612 surface->pixels = NULL; | |
| 1613 } | |
| 1614 | |
| 1615 /* realloc the buffer to release unused memory */ | |
| 1616 { | |
| 1617 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1618 if(!p) | |
| 1619 p = rlebuf; | |
| 1620 surface->map->sw_data->aux_data = p; | |
| 1621 } | |
| 1622 | |
| 1623 return 0; | |
| 1624 } | |
| 1625 | |
| 1626 static Uint32 getpix_8(Uint8 *srcbuf) | |
| 1627 { | |
| 1628 return *srcbuf; | |
| 1629 } | |
| 1630 | |
| 1631 static Uint32 getpix_16(Uint8 *srcbuf) | |
| 1632 { | |
| 1633 return *(Uint16 *)srcbuf; | |
| 1634 } | |
| 1635 | |
| 1636 static Uint32 getpix_24(Uint8 *srcbuf) | |
| 1637 { | |
| 1638 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) | |
| 1639 return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16); | |
| 1640 else | |
| 1641 return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2]; | |
| 1642 } | |
| 1643 | |
| 1644 static Uint32 getpix_32(Uint8 *srcbuf) | |
| 1645 { | |
| 1646 return *(Uint32 *)srcbuf; | |
| 1647 } | |
| 1648 | |
| 1649 typedef Uint32 (*getpix_func)(Uint8 *); | |
| 1650 | |
| 1651 static getpix_func getpixes[4] = { | |
| 1652 getpix_8, getpix_16, getpix_24, getpix_32 | |
| 1653 }; | |
| 1654 | |
| 1655 static int RLEColorkeySurface(SDL_Surface *surface) | |
| 1656 { | |
| 1657 Uint8 *rlebuf, *dst; | |
| 1658 int maxn; | |
| 1659 int y; | |
| 1660 Uint8 *srcbuf, *curbuf, *lastline; | |
| 1661 int maxsize = 0; | |
| 1662 int skip, run; | |
| 1663 int bpp = surface->format->BytesPerPixel; | |
| 1664 getpix_func getpix; | |
| 1665 Uint32 ckey, rgbmask; | |
| 1666 int w, h; | |
| 1667 | |
| 1668 /* calculate the worst case size for the compressed surface */ | |
| 1669 switch(bpp) { | |
| 1670 case 1: | |
| 1671 /* worst case is alternating opaque and transparent pixels, | |
| 1672 starting with an opaque pixel */ | |
| 1673 maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2; | |
| 1674 break; | |
| 1675 case 2: | |
| 1676 case 3: | |
| 1677 /* worst case is solid runs, at most 255 pixels wide */ | |
| 1678 maxsize = surface->h * (2 * (surface->w / 255 + 1) | |
| 1679 + surface->w * bpp) + 2; | |
| 1680 break; | |
| 1681 case 4: | |
| 1682 /* worst case is solid runs, at most 65535 pixels wide */ | |
| 1683 maxsize = surface->h * (4 * (surface->w / 65535 + 1) | |
| 1684 + surface->w * 4) + 4; | |
| 1685 break; | |
| 1686 } | |
| 1687 | |
| 1688 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1689 if ( rlebuf == NULL ) { | |
| 1690 SDL_OutOfMemory(); | |
| 1691 return(-1); | |
| 1692 } | |
| 1693 | |
| 1694 /* Set up the conversion */ | |
|
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4314a501d7be
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Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
1695 srcbuf = (Uint8 *)surface->pixels; |
| 0 | 1696 curbuf = srcbuf; |
| 1697 maxn = bpp == 4 ? 65535 : 255; | |
| 1698 skip = run = 0; | |
| 1699 dst = rlebuf; | |
| 1700 rgbmask = ~surface->format->Amask; | |
| 1701 ckey = surface->format->colorkey & rgbmask; | |
| 1702 lastline = dst; | |
| 1703 getpix = getpixes[bpp - 1]; | |
| 1704 w = surface->w; | |
| 1705 h = surface->h; | |
| 1706 | |
| 1707 #define ADD_COUNTS(n, m) \ | |
| 1708 if(bpp == 4) { \ | |
| 1709 ((Uint16 *)dst)[0] = n; \ | |
| 1710 ((Uint16 *)dst)[1] = m; \ | |
| 1711 dst += 4; \ | |
| 1712 } else { \ | |
| 1713 dst[0] = n; \ | |
| 1714 dst[1] = m; \ | |
| 1715 dst += 2; \ | |
| 1716 } | |
| 1717 | |
| 1718 for(y = 0; y < h; y++) { | |
| 1719 int x = 0; | |
| 1720 int blankline = 0; | |
| 1721 do { | |
| 1722 int run, skip, len; | |
| 1723 int runstart; | |
| 1724 int skipstart = x; | |
| 1725 | |
| 1726 /* find run of transparent, then opaque pixels */ | |
| 1727 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey) | |
| 1728 x++; | |
| 1729 runstart = x; | |
| 1730 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey) | |
| 1731 x++; | |
| 1732 skip = runstart - skipstart; | |
| 1733 if(skip == w) | |
| 1734 blankline = 1; | |
| 1735 run = x - runstart; | |
| 1736 | |
| 1737 /* encode segment */ | |
| 1738 while(skip > maxn) { | |
| 1739 ADD_COUNTS(maxn, 0); | |
| 1740 skip -= maxn; | |
| 1741 } | |
| 1742 len = MIN(run, maxn); | |
| 1743 ADD_COUNTS(skip, len); | |
| 1744 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1745 dst += len * bpp; | |
| 1746 run -= len; | |
| 1747 runstart += len; | |
| 1748 while(run) { | |
| 1749 len = MIN(run, maxn); | |
| 1750 ADD_COUNTS(0, len); | |
| 1751 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1752 dst += len * bpp; | |
| 1753 runstart += len; | |
| 1754 run -= len; | |
| 1755 } | |
| 1756 if(!blankline) | |
| 1757 lastline = dst; | |
| 1758 } while(x < w); | |
| 1759 | |
| 1760 srcbuf += surface->pitch; | |
| 1761 } | |
| 1762 dst = lastline; /* back up bast trailing blank lines */ | |
| 1763 ADD_COUNTS(0, 0); | |
| 1764 | |
| 1765 #undef ADD_COUNTS | |
| 1766 | |
| 1767 /* Now that we have it encoded, release the original pixels */ | |
| 1768 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1769 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1770 free( surface->pixels ); | |
| 1771 surface->pixels = NULL; | |
| 1772 } | |
| 1773 | |
| 1774 /* realloc the buffer to release unused memory */ | |
| 1775 { | |
| 1776 /* If realloc returns NULL, the original block is left intact */ | |
| 1777 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1778 if(!p) | |
| 1779 p = rlebuf; | |
| 1780 surface->map->sw_data->aux_data = p; | |
| 1781 } | |
| 1782 | |
| 1783 return(0); | |
| 1784 } | |
| 1785 | |
| 1786 int SDL_RLESurface(SDL_Surface *surface) | |
| 1787 { | |
| 1788 int retcode; | |
| 1789 | |
| 1790 /* Clear any previous RLE conversion */ | |
| 1791 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1792 SDL_UnRLESurface(surface, 1); | |
| 1793 } | |
| 1794 | |
| 1795 /* We don't support RLE encoding of bitmaps */ | |
| 1796 if ( surface->format->BitsPerPixel < 8 ) { | |
| 1797 return(-1); | |
| 1798 } | |
| 1799 | |
| 1800 /* Lock the surface if it's in hardware */ | |
|
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parents:
297
diff
changeset
|
1801 if ( SDL_MUSTLOCK(surface) ) { |
|
4314a501d7be
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Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
1802 if ( SDL_LockSurface(surface) < 0 ) { |
| 0 | 1803 return(-1); |
| 1804 } | |
| 1805 } | |
| 1806 | |
| 1807 /* Encode */ | |
| 1808 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1809 retcode = RLEColorkeySurface(surface); | |
| 1810 } else { | |
| 1811 if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 1812 && surface->format->Amask != 0) | |
| 1813 retcode = RLEAlphaSurface(surface); | |
| 1814 else | |
| 1815 retcode = -1; /* no RLE for per-surface alpha sans ckey */ | |
| 1816 } | |
| 1817 | |
| 1818 /* Unlock the surface if it's in hardware */ | |
|
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Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
1819 if ( SDL_MUSTLOCK(surface) ) { |
|
4314a501d7be
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Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
1820 SDL_UnlockSurface(surface); |
| 0 | 1821 } |
| 1822 | |
| 1823 if(retcode < 0) | |
| 1824 return -1; | |
| 1825 | |
| 1826 /* The surface is now accelerated */ | |
| 1827 surface->flags |= SDL_RLEACCEL; | |
| 1828 | |
| 1829 return(0); | |
| 1830 } | |
| 1831 | |
| 1832 /* | |
| 1833 * Un-RLE a surface with pixel alpha | |
| 1834 * This may not give back exactly the image before RLE-encoding; all | |
| 1835 * completely transparent pixels will be lost, and colour and alpha depth | |
| 1836 * may have been reduced (when encoding for 16bpp targets). | |
| 1837 */ | |
| 1838 static void UnRLEAlpha(SDL_Surface *surface) | |
| 1839 { | |
| 1840 Uint8 *srcbuf; | |
| 1841 Uint32 *dst; | |
| 1842 SDL_PixelFormat *sf = surface->format; | |
| 1843 RLEDestFormat *df = surface->map->sw_data->aux_data; | |
| 1844 int (*uncopy_opaque)(Uint32 *, void *, int, | |
| 1845 RLEDestFormat *, SDL_PixelFormat *); | |
| 1846 int (*uncopy_transl)(Uint32 *, void *, int, | |
| 1847 RLEDestFormat *, SDL_PixelFormat *); | |
| 1848 int w = surface->w; | |
| 1849 int bpp = df->BytesPerPixel; | |
| 1850 | |
| 1851 if(bpp == 2) { | |
| 1852 uncopy_opaque = uncopy_opaque_16; | |
| 1853 uncopy_transl = uncopy_transl_16; | |
| 1854 } else { | |
| 1855 uncopy_opaque = uncopy_transl = uncopy_32; | |
| 1856 } | |
| 1857 | |
| 1858 surface->pixels = malloc(surface->h * surface->pitch); | |
| 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) | |
| 1882 return; | |
| 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 } | |
| 1903 } | |
| 1904 | |
| 1905 void SDL_UnRLESurface(SDL_Surface *surface, int recode) | |
| 1906 { | |
| 1907 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1908 surface->flags &= ~SDL_RLEACCEL; | |
| 1909 | |
| 1910 if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1911 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1912 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1913 SDL_Rect full; | |
| 1914 unsigned alpha_flag; | |
| 1915 | |
| 1916 /* re-create the original surface */ | |
| 1917 surface->pixels = malloc(surface->h * surface->pitch); | |
| 1918 | |
| 1919 /* fill it with the background colour */ | |
| 1920 SDL_FillRect(surface, NULL, surface->format->colorkey); | |
| 1921 | |
| 1922 /* now render the encoded surface */ | |
| 1923 full.x = full.y = 0; | |
| 1924 full.w = surface->w; | |
| 1925 full.h = surface->h; | |
| 1926 alpha_flag = surface->flags & SDL_SRCALPHA; | |
| 1927 surface->flags &= ~SDL_SRCALPHA; /* opaque blit */ | |
| 1928 SDL_RLEBlit(surface, &full, surface, &full); | |
| 1929 surface->flags |= alpha_flag; | |
| 1930 } else | |
| 1931 UnRLEAlpha(surface); | |
| 1932 } | |
| 1933 | |
| 1934 if ( surface->map && surface->map->sw_data->aux_data ) { | |
| 1935 free(surface->map->sw_data->aux_data); | |
| 1936 surface->map->sw_data->aux_data = NULL; | |
| 1937 } | |
| 1938 } | |
| 1939 } | |
| 1940 | |
| 1941 |