Mercurial > sdl-ios-xcode
annotate src/video/SDL_RLEaccel.c @ 526:4314a501d7be
Fixed a crash blitting RLE surfaces to RLE surfaces
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 11 Oct 2002 07:56:36 +0000 |
| parents | f6ffac90895c |
| children | 5bb080d35049 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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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 | |
| 105 #ifndef MAX | |
| 106 #define MAX(a, b) ((a) > (b) ? (a) : (b)) | |
| 107 #endif | |
| 108 #ifndef MIN | |
| 109 #define MIN(a, b) ((a) < (b) ? (a) : (b)) | |
| 110 #endif | |
| 111 | |
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112 #define PIXEL_COPY(to, from, len, bpp) \ |
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113 do { \ |
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114 if(bpp == 4) { \ |
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115 SDL_memcpy4(to, from, (unsigned)(len)); \ |
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116 } else { \ |
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117 SDL_memcpy(to, from, (unsigned)(len) * (bpp)); \ |
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118 } \ |
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119 } while(0) |
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120 |
| 0 | 121 /* |
| 122 * Various colorkey blit methods, for opaque and per-surface alpha | |
| 123 */ | |
| 124 | |
| 125 #define OPAQUE_BLIT(to, from, length, bpp, alpha) \ | |
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126 PIXEL_COPY(to, from, length, bpp) |
| 0 | 127 |
| 128 /* | |
| 129 * For 32bpp pixels on the form 0x00rrggbb: | |
| 130 * If we treat the middle component separately, we can process the two | |
| 131 * remaining in parallel. This is safe to do because of the gap to the left | |
| 132 * of each component, so the bits from the multiplication don't collide. | |
| 133 * This can be used for any RGB permutation of course. | |
| 134 */ | |
| 135 #define ALPHA_BLIT32_888(to, from, length, bpp, alpha) \ | |
| 136 do { \ | |
| 137 int i; \ | |
| 138 Uint32 *src = (Uint32 *)(from); \ | |
| 139 Uint32 *dst = (Uint32 *)(to); \ | |
| 140 for(i = 0; i < (int)(length); i++) { \ | |
| 141 Uint32 s = *src++; \ | |
| 142 Uint32 d = *dst; \ | |
| 143 Uint32 s1 = s & 0xff00ff; \ | |
| 144 Uint32 d1 = d & 0xff00ff; \ | |
| 145 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 146 s &= 0xff00; \ | |
| 147 d &= 0xff00; \ | |
| 148 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 149 *dst++ = d1 | d; \ | |
| 150 } \ | |
| 151 } while(0) | |
| 152 | |
| 153 /* | |
| 154 * For 16bpp pixels we can go a step further: put the middle component | |
| 155 * in the high 16 bits of a 32 bit word, and process all three RGB | |
| 156 * components at the same time. Since the smallest gap is here just | |
| 157 * 5 bits, we have to scale alpha down to 5 bits as well. | |
| 158 */ | |
| 159 #define ALPHA_BLIT16_565(to, from, length, bpp, alpha) \ | |
| 160 do { \ | |
| 161 int i; \ | |
| 162 Uint16 *src = (Uint16 *)(from); \ | |
| 163 Uint16 *dst = (Uint16 *)(to); \ | |
| 164 for(i = 0; i < (int)(length); i++) { \ | |
| 165 Uint32 s = *src++; \ | |
| 166 Uint32 d = *dst; \ | |
| 167 s = (s | s << 16) & 0x07e0f81f; \ | |
| 168 d = (d | d << 16) & 0x07e0f81f; \ | |
| 169 d += (s - d) * alpha >> 5; \ | |
| 170 d &= 0x07e0f81f; \ | |
| 171 *dst++ = d | d >> 16; \ | |
| 172 } \ | |
| 173 } while(0) | |
| 174 | |
| 175 #define ALPHA_BLIT16_555(to, from, length, bpp, alpha) \ | |
| 176 do { \ | |
| 177 int i; \ | |
| 178 Uint16 *src = (Uint16 *)(from); \ | |
| 179 Uint16 *dst = (Uint16 *)(to); \ | |
| 180 for(i = 0; i < (int)(length); i++) { \ | |
| 181 Uint32 s = *src++; \ | |
| 182 Uint32 d = *dst; \ | |
| 183 s = (s | s << 16) & 0x03e07c1f; \ | |
| 184 d = (d | d << 16) & 0x03e07c1f; \ | |
| 185 d += (s - d) * alpha >> 5; \ | |
| 186 d &= 0x03e07c1f; \ | |
| 187 *dst++ = d | d >> 16; \ | |
| 188 } \ | |
| 189 } while(0) | |
| 190 | |
| 191 /* | |
| 192 * The general slow catch-all function, for remaining depths and formats | |
| 193 */ | |
| 194 #define ALPHA_BLIT_ANY(to, from, length, bpp, alpha) \ | |
| 195 do { \ | |
| 196 int i; \ | |
| 197 Uint8 *src = from; \ | |
| 198 Uint8 *dst = to; \ | |
| 199 for(i = 0; i < (int)(length); i++) { \ | |
| 200 Uint32 s, d; \ | |
| 201 unsigned rs, gs, bs, rd, gd, bd; \ | |
| 202 switch(bpp) { \ | |
| 203 case 2: \ | |
| 204 s = *(Uint16 *)src; \ | |
| 205 d = *(Uint16 *)dst; \ | |
| 206 break; \ | |
| 207 case 3: \ | |
| 208 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 209 s = (src[0] << 16) | (src[1] << 8) | src[2]; \ | |
| 210 d = (dst[0] << 16) | (dst[1] << 8) | dst[2]; \ | |
| 211 } else { \ | |
| 212 s = (src[2] << 16) | (src[1] << 8) | src[0]; \ | |
| 213 d = (dst[2] << 16) | (dst[1] << 8) | dst[0]; \ | |
| 214 } \ | |
| 215 break; \ | |
| 216 case 4: \ | |
| 217 s = *(Uint32 *)src; \ | |
| 218 d = *(Uint32 *)dst; \ | |
| 219 break; \ | |
| 220 } \ | |
| 221 RGB_FROM_PIXEL(s, fmt, rs, gs, bs); \ | |
| 222 RGB_FROM_PIXEL(d, fmt, rd, gd, bd); \ | |
| 223 rd += (rs - rd) * alpha >> 8; \ | |
| 224 gd += (gs - gd) * alpha >> 8; \ | |
| 225 bd += (bs - bd) * alpha >> 8; \ | |
| 226 PIXEL_FROM_RGB(d, fmt, rd, gd, bd); \ | |
| 227 switch(bpp) { \ | |
| 228 case 2: \ | |
| 229 *(Uint16 *)dst = d; \ | |
| 230 break; \ | |
| 231 case 3: \ | |
| 232 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) { \ | |
| 233 dst[0] = d >> 16; \ | |
| 234 dst[1] = d >> 8; \ | |
| 235 dst[2] = d; \ | |
| 236 } else { \ | |
| 237 dst[0] = d; \ | |
| 238 dst[1] = d >> 8; \ | |
| 239 dst[2] = d >> 16; \ | |
| 240 } \ | |
| 241 break; \ | |
| 242 case 4: \ | |
| 243 *(Uint32 *)dst = d; \ | |
| 244 break; \ | |
| 245 } \ | |
| 246 src += bpp; \ | |
| 247 dst += bpp; \ | |
| 248 } \ | |
| 249 } while(0) | |
| 250 | |
| 251 | |
| 252 /* | |
| 253 * Special case: 50% alpha (alpha=128) | |
| 254 * This is treated specially because it can be optimized very well, and | |
| 255 * since it is good for many cases of semi-translucency. | |
| 256 * The theory is to do all three components at the same time: | |
| 257 * First zero the lowest bit of each component, which gives us room to | |
| 258 * add them. Then shift right and add the sum of the lowest bits. | |
| 259 */ | |
| 260 #define ALPHA_BLIT32_888_50(to, from, length, bpp, alpha) \ | |
| 261 do { \ | |
| 262 int i; \ | |
| 263 Uint32 *src = (Uint32 *)(from); \ | |
| 264 Uint32 *dst = (Uint32 *)(to); \ | |
| 265 for(i = 0; i < (int)(length); i++) { \ | |
| 266 Uint32 s = *src++; \ | |
| 267 Uint32 d = *dst; \ | |
| 268 *dst++ = (((s & 0x00fefefe) + (d & 0x00fefefe)) >> 1) \ | |
| 269 + (s & d & 0x00010101); \ | |
| 270 } \ | |
| 271 } while(0) | |
| 272 | |
| 273 /* | |
| 274 * For 16bpp, we can actually blend two pixels in parallel, if we take | |
| 275 * care to shift before we add, not after. | |
| 276 */ | |
| 277 | |
| 278 /* helper: blend a single 16 bit pixel at 50% */ | |
| 279 #define BLEND16_50(dst, src, mask) \ | |
| 280 do { \ | |
| 281 Uint32 s = *src++; \ | |
| 282 Uint32 d = *dst; \ | |
| 283 *dst++ = (((s & mask) + (d & mask)) >> 1) \ | |
| 284 + (s & d & (~mask & 0xffff)); \ | |
| 285 } while(0) | |
| 286 | |
| 287 /* basic 16bpp blender. mask is the pixels to keep when adding. */ | |
| 288 #define ALPHA_BLIT16_50(to, from, length, bpp, alpha, mask) \ | |
| 289 do { \ | |
| 290 unsigned n = (length); \ | |
| 291 Uint16 *src = (Uint16 *)(from); \ | |
| 292 Uint16 *dst = (Uint16 *)(to); \ | |
| 293 if(((unsigned long)src ^ (unsigned long)dst) & 3) { \ | |
| 294 /* source and destination not in phase, blit one by one */ \ | |
| 295 while(n--) \ | |
| 296 BLEND16_50(dst, src, mask); \ | |
| 297 } else { \ | |
| 298 if((unsigned long)src & 3) { \ | |
| 299 /* first odd pixel */ \ | |
| 300 BLEND16_50(dst, src, mask); \ | |
| 301 n--; \ | |
| 302 } \ | |
| 303 for(; n > 1; n -= 2) { \ | |
| 304 Uint32 s = *(Uint32 *)src; \ | |
| 305 Uint32 d = *(Uint32 *)dst; \ | |
| 306 *(Uint32 *)dst = ((s & (mask | mask << 16)) >> 1) \ | |
| 307 + ((d & (mask | mask << 16)) >> 1) \ | |
| 308 + (s & d & (~(mask | mask << 16))); \ | |
| 309 src += 2; \ | |
| 310 dst += 2; \ | |
| 311 } \ | |
| 312 if(n) \ | |
| 313 BLEND16_50(dst, src, mask); /* last odd pixel */ \ | |
| 314 } \ | |
| 315 } while(0) | |
| 316 | |
| 317 #define ALPHA_BLIT16_565_50(to, from, length, bpp, alpha) \ | |
| 318 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xf7de) | |
| 319 | |
| 320 #define ALPHA_BLIT16_555_50(to, from, length, bpp, alpha) \ | |
| 321 ALPHA_BLIT16_50(to, from, length, bpp, alpha, 0xfbde) | |
| 322 | |
| 323 | |
| 324 #define CHOOSE_BLIT(blitter, alpha, fmt) \ | |
| 325 do { \ | |
| 326 if(alpha == 255) { \ | |
| 327 switch(fmt->BytesPerPixel) { \ | |
| 328 case 1: blitter(1, Uint8, OPAQUE_BLIT); break; \ | |
| 329 case 2: blitter(2, Uint8, OPAQUE_BLIT); break; \ | |
| 330 case 3: blitter(3, Uint8, OPAQUE_BLIT); break; \ | |
| 331 case 4: blitter(4, Uint16, OPAQUE_BLIT); break; \ | |
| 332 } \ | |
| 333 } else { \ | |
| 334 switch(fmt->BytesPerPixel) { \ | |
| 335 case 1: \ | |
| 336 /* No 8bpp alpha blitting */ \ | |
| 337 break; \ | |
| 338 \ | |
| 339 case 2: \ | |
| 340 switch(fmt->Rmask | fmt->Gmask | fmt->Bmask) { \ | |
| 341 case 0xffff: \ | |
| 342 if(fmt->Gmask == 0x07e0 \ | |
| 343 || fmt->Rmask == 0x07e0 \ | |
| 344 || fmt->Bmask == 0x07e0) { \ | |
| 345 if(alpha == 128) \ | |
| 346 blitter(2, Uint8, ALPHA_BLIT16_565_50); \ | |
| 347 else { \ | |
| 348 alpha >>= 3; /* use 5 bit alpha */ \ | |
| 349 blitter(2, Uint8, ALPHA_BLIT16_565); \ | |
| 350 } \ | |
| 351 } else \ | |
| 352 goto general16; \ | |
| 353 break; \ | |
| 354 \ | |
| 355 case 0x7fff: \ | |
| 356 if(fmt->Gmask == 0x03e0 \ | |
| 357 || fmt->Rmask == 0x03e0 \ | |
| 358 || fmt->Bmask == 0x03e0) { \ | |
| 359 if(alpha == 128) \ | |
| 360 blitter(2, Uint8, ALPHA_BLIT16_555_50); \ | |
| 361 else { \ | |
| 362 alpha >>= 3; /* use 5 bit alpha */ \ | |
| 363 blitter(2, Uint8, ALPHA_BLIT16_555); \ | |
| 364 } \ | |
| 365 break; \ | |
| 366 } \ | |
| 367 /* fallthrough */ \ | |
| 368 \ | |
| 369 default: \ | |
| 370 general16: \ | |
| 371 blitter(2, Uint8, ALPHA_BLIT_ANY); \ | |
| 372 } \ | |
| 373 break; \ | |
| 374 \ | |
| 375 case 3: \ | |
| 376 blitter(3, Uint8, ALPHA_BLIT_ANY); \ | |
| 377 break; \ | |
| 378 \ | |
| 379 case 4: \ | |
| 380 if((fmt->Rmask | fmt->Gmask | fmt->Bmask) == 0x00ffffff \ | |
| 381 && (fmt->Gmask == 0xff00 || fmt->Rmask == 0xff00 \ | |
| 382 || fmt->Bmask == 0xff00)) { \ | |
| 383 if(alpha == 128) \ | |
| 384 blitter(4, Uint16, ALPHA_BLIT32_888_50); \ | |
| 385 else \ | |
| 386 blitter(4, Uint16, ALPHA_BLIT32_888); \ | |
| 387 } else \ | |
| 388 blitter(4, Uint16, ALPHA_BLIT_ANY); \ | |
| 389 break; \ | |
| 390 } \ | |
| 391 } \ | |
| 392 } while(0) | |
| 393 | |
| 394 | |
| 395 /* | |
| 396 * This takes care of the case when the surface is clipped on the left and/or | |
| 397 * right. Top clipping has already been taken care of. | |
| 398 */ | |
| 399 static void RLEClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 400 Uint8 *dstbuf, SDL_Rect *srcrect, unsigned alpha) | |
| 401 { | |
| 402 SDL_PixelFormat *fmt = dst->format; | |
| 403 | |
| 404 #define RLECLIPBLIT(bpp, Type, do_blit) \ | |
| 405 do { \ | |
| 406 int linecount = srcrect->h; \ | |
| 407 int ofs = 0; \ | |
| 408 int left = srcrect->x; \ | |
| 409 int right = left + srcrect->w; \ | |
| 410 dstbuf -= left * bpp; \ | |
| 411 for(;;) { \ | |
| 412 int run; \ | |
| 413 ofs += *(Type *)srcbuf; \ | |
| 414 run = ((Type *)srcbuf)[1]; \ | |
| 415 srcbuf += 2 * sizeof(Type); \ | |
| 416 if(run) { \ | |
| 417 /* clip to left and right borders */ \ | |
| 418 if(ofs < right) { \ | |
| 419 int start = 0; \ | |
| 420 int len = run; \ | |
| 421 int startcol; \ | |
| 422 if(left - ofs > 0) { \ | |
| 423 start = left - ofs; \ | |
| 424 len -= start; \ | |
| 425 if(len <= 0) \ | |
| 426 goto nocopy ## bpp ## do_blit; \ | |
| 427 } \ | |
| 428 startcol = ofs + start; \ | |
| 429 if(len > right - startcol) \ | |
| 430 len = right - startcol; \ | |
| 431 do_blit(dstbuf + startcol * bpp, srcbuf + start * bpp, \ | |
| 432 len, bpp, alpha); \ | |
| 433 } \ | |
| 434 nocopy ## bpp ## do_blit: \ | |
| 435 srcbuf += run * bpp; \ | |
| 436 ofs += run; \ | |
| 437 } else if(!ofs) \ | |
| 438 break; \ | |
| 439 if(ofs == w) { \ | |
| 440 ofs = 0; \ | |
| 441 dstbuf += dst->pitch; \ | |
| 442 if(!--linecount) \ | |
| 443 break; \ | |
| 444 } \ | |
| 445 } \ | |
| 446 } while(0) | |
| 447 | |
| 448 CHOOSE_BLIT(RLECLIPBLIT, alpha, fmt); | |
| 449 | |
| 450 #undef RLECLIPBLIT | |
| 451 | |
| 452 } | |
| 453 | |
| 454 | |
| 455 /* blit a colorkeyed RLE surface */ | |
| 456 int SDL_RLEBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 457 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 458 { | |
| 459 Uint8 *dstbuf; | |
| 460 Uint8 *srcbuf; | |
| 461 int x, y; | |
| 462 int w = src->w; | |
| 463 unsigned alpha; | |
| 464 | |
| 465 /* Lock the destination if necessary */ | |
|
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diff
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466 if ( SDL_MUSTLOCK(dst) ) { |
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467 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 468 return(-1); |
| 469 } | |
| 470 } | |
| 471 | |
| 472 /* Set up the source and destination pointers */ | |
| 473 x = dstrect->x; | |
| 474 y = dstrect->y; | |
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475 dstbuf = (Uint8 *)dst->pixels |
| 0 | 476 + y * dst->pitch + x * src->format->BytesPerPixel; |
| 477 srcbuf = (Uint8 *)src->map->sw_data->aux_data; | |
| 478 | |
| 479 { | |
| 480 /* skip lines at the top if neccessary */ | |
| 481 int vskip = srcrect->y; | |
| 482 int ofs = 0; | |
| 483 if(vskip) { | |
| 484 | |
| 485 #define RLESKIP(bpp, Type) \ | |
| 486 for(;;) { \ | |
| 487 int run; \ | |
| 488 ofs += *(Type *)srcbuf; \ | |
| 489 run = ((Type *)srcbuf)[1]; \ | |
| 490 srcbuf += sizeof(Type) * 2; \ | |
| 491 if(run) { \ | |
| 492 srcbuf += run * bpp; \ | |
| 493 ofs += run; \ | |
| 494 } else if(!ofs) \ | |
| 495 goto done; \ | |
| 496 if(ofs == w) { \ | |
| 497 ofs = 0; \ | |
| 498 if(!--vskip) \ | |
| 499 break; \ | |
| 500 } \ | |
| 501 } | |
| 502 | |
| 503 switch(src->format->BytesPerPixel) { | |
| 504 case 1: RLESKIP(1, Uint8); break; | |
| 505 case 2: RLESKIP(2, Uint8); break; | |
| 506 case 3: RLESKIP(3, Uint8); break; | |
| 507 case 4: RLESKIP(4, Uint16); break; | |
| 508 } | |
| 509 | |
| 510 #undef RLESKIP | |
| 511 | |
| 512 } | |
| 513 } | |
| 514 | |
| 515 alpha = (src->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 516 ? src->format->alpha : 255; | |
| 517 /* if left or right edge clipping needed, call clip blit */ | |
| 518 if ( srcrect->x || srcrect->w != src->w ) { | |
| 519 RLEClipBlit(w, srcbuf, dst, dstbuf, srcrect, alpha); | |
| 520 } else { | |
| 521 SDL_PixelFormat *fmt = src->format; | |
| 522 | |
| 523 #define RLEBLIT(bpp, Type, do_blit) \ | |
| 524 do { \ | |
| 525 int linecount = srcrect->h; \ | |
| 526 int ofs = 0; \ | |
| 527 for(;;) { \ | |
| 528 unsigned run; \ | |
| 529 ofs += *(Type *)srcbuf; \ | |
| 530 run = ((Type *)srcbuf)[1]; \ | |
| 531 srcbuf += 2 * sizeof(Type); \ | |
| 532 if(run) { \ | |
| 533 do_blit(dstbuf + ofs * bpp, srcbuf, run, bpp, alpha); \ | |
| 534 srcbuf += run * bpp; \ | |
| 535 ofs += run; \ | |
| 536 } else if(!ofs) \ | |
| 537 break; \ | |
| 538 if(ofs == w) { \ | |
| 539 ofs = 0; \ | |
| 540 dstbuf += dst->pitch; \ | |
| 541 if(!--linecount) \ | |
| 542 break; \ | |
| 543 } \ | |
| 544 } \ | |
| 545 } while(0) | |
| 546 | |
| 547 CHOOSE_BLIT(RLEBLIT, alpha, fmt); | |
| 548 | |
| 549 #undef RLEBLIT | |
| 550 } | |
| 551 | |
| 552 done: | |
| 553 /* Unlock the destination if necessary */ | |
|
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554 if ( SDL_MUSTLOCK(dst) ) { |
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555 SDL_UnlockSurface(dst); |
| 0 | 556 } |
| 557 return(0); | |
| 558 } | |
| 559 | |
| 560 #undef OPAQUE_BLIT | |
| 561 | |
| 562 /* | |
| 563 * Per-pixel blitting macros for translucent pixels: | |
| 564 * These use the same techniques as the per-surface blitting macros | |
| 565 */ | |
| 566 | |
| 567 /* | |
| 568 * For 32bpp pixels, we have made sure the alpha is stored in the top | |
| 569 * 8 bits, so proceed as usual | |
| 570 */ | |
| 571 #define BLIT_TRANSL_888(src, dst) \ | |
| 572 do { \ | |
| 573 Uint32 s = src; \ | |
| 574 Uint32 d = dst; \ | |
| 575 unsigned alpha = s >> 24; \ | |
| 576 Uint32 s1 = s & 0xff00ff; \ | |
| 577 Uint32 d1 = d & 0xff00ff; \ | |
| 578 d1 = (d1 + ((s1 - d1) * alpha >> 8)) & 0xff00ff; \ | |
| 579 s &= 0xff00; \ | |
| 580 d &= 0xff00; \ | |
| 581 d = (d + ((s - d) * alpha >> 8)) & 0xff00; \ | |
| 582 dst = d1 | d; \ | |
| 583 } while(0) | |
| 584 | |
| 585 /* | |
| 586 * For 16bpp pixels, we have stored the 5 most significant alpha bits in | |
| 587 * bits 5-10. As before, we can process all 3 RGB components at the same time. | |
| 588 */ | |
| 589 #define BLIT_TRANSL_565(src, dst) \ | |
| 590 do { \ | |
| 591 Uint32 s = src; \ | |
| 592 Uint32 d = dst; \ | |
| 593 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 594 s &= 0x07e0f81f; \ | |
| 595 d = (d | d << 16) & 0x07e0f81f; \ | |
| 596 d += (s - d) * alpha >> 5; \ | |
| 597 d &= 0x07e0f81f; \ | |
| 598 dst = d | d >> 16; \ | |
| 599 } while(0) | |
| 600 | |
| 601 #define BLIT_TRANSL_555(src, dst) \ | |
| 602 do { \ | |
| 603 Uint32 s = src; \ | |
| 604 Uint32 d = dst; \ | |
| 605 unsigned alpha = (s & 0x3e0) >> 5; \ | |
| 606 s &= 0x03e07c1f; \ | |
| 607 d = (d | d << 16) & 0x03e07c1f; \ | |
| 608 d += (s - d) * alpha >> 5; \ | |
| 609 d &= 0x03e07c1f; \ | |
| 610 dst = d | d >> 16; \ | |
| 611 } while(0) | |
| 612 | |
| 613 /* used to save the destination format in the encoding. Designed to be | |
| 614 macro-compatible with SDL_PixelFormat but without the unneeded fields */ | |
| 615 typedef struct { | |
| 616 Uint8 BytesPerPixel; | |
| 617 Uint8 Rloss; | |
| 618 Uint8 Gloss; | |
| 619 Uint8 Bloss; | |
| 620 Uint8 Rshift; | |
| 621 Uint8 Gshift; | |
| 622 Uint8 Bshift; | |
| 623 Uint8 Ashift; | |
| 624 Uint32 Rmask; | |
| 625 Uint32 Gmask; | |
| 626 Uint32 Bmask; | |
| 627 Uint32 Amask; | |
| 628 } RLEDestFormat; | |
| 629 | |
| 630 /* blit a pixel-alpha RLE surface clipped at the right and/or left edges */ | |
| 631 static void RLEAlphaClipBlit(int w, Uint8 *srcbuf, SDL_Surface *dst, | |
| 632 Uint8 *dstbuf, SDL_Rect *srcrect) | |
| 633 { | |
| 634 SDL_PixelFormat *df = dst->format; | |
| 635 /* | |
| 636 * clipped blitter: Ptype is the destination pixel type, | |
| 637 * Ctype the translucent count type, and do_blend the macro | |
| 638 * to blend one pixel. | |
| 639 */ | |
| 640 #define RLEALPHACLIPBLIT(Ptype, Ctype, do_blend) \ | |
| 641 do { \ | |
| 642 int linecount = srcrect->h; \ | |
| 643 int left = srcrect->x; \ | |
| 644 int right = left + srcrect->w; \ | |
| 645 dstbuf -= left * sizeof(Ptype); \ | |
| 646 do { \ | |
| 647 int ofs = 0; \ | |
| 648 /* blit opaque pixels on one line */ \ | |
| 649 do { \ | |
| 650 unsigned run; \ | |
| 651 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 652 run = ((Ctype *)srcbuf)[1]; \ | |
| 653 srcbuf += 2 * sizeof(Ctype); \ | |
| 654 if(run) { \ | |
| 655 /* clip to left and right borders */ \ | |
| 656 int cofs = ofs; \ | |
| 657 int crun = run; \ | |
| 658 if(left - cofs > 0) { \ | |
| 659 crun -= left - cofs; \ | |
| 660 cofs = left; \ | |
| 661 } \ | |
| 662 if(crun > right - cofs) \ | |
| 663 crun = right - cofs; \ | |
| 664 if(crun > 0) \ | |
|
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665 PIXEL_COPY(dstbuf + cofs * sizeof(Ptype), \ |
| 0 | 666 srcbuf + (cofs - ofs) * sizeof(Ptype), \ |
|
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667 (unsigned)crun, sizeof(Ptype)); \ |
| 0 | 668 srcbuf += run * sizeof(Ptype); \ |
| 669 ofs += run; \ | |
| 670 } else if(!ofs) \ | |
| 671 return; \ | |
| 672 } while(ofs < w); \ | |
| 673 /* skip padding if necessary */ \ | |
| 674 if(sizeof(Ptype) == 2) \ | |
| 675 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 676 /* blit translucent pixels on the same line */ \ | |
| 677 ofs = 0; \ | |
| 678 do { \ | |
| 679 unsigned run; \ | |
| 680 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 681 run = ((Uint16 *)srcbuf)[1]; \ | |
| 682 srcbuf += 4; \ | |
| 683 if(run) { \ | |
| 684 /* clip to left and right borders */ \ | |
| 685 int cofs = ofs; \ | |
| 686 int crun = run; \ | |
| 687 if(left - cofs > 0) { \ | |
| 688 crun -= left - cofs; \ | |
| 689 cofs = left; \ | |
| 690 } \ | |
| 691 if(crun > right - cofs) \ | |
| 692 crun = right - cofs; \ | |
| 693 if(crun > 0) { \ | |
| 694 Ptype *dst = (Ptype *)dstbuf + cofs; \ | |
| 695 Uint32 *src = (Uint32 *)srcbuf + (cofs - ofs); \ | |
| 696 int i; \ | |
| 697 for(i = 0; i < crun; i++) \ | |
| 698 do_blend(src[i], dst[i]); \ | |
| 699 } \ | |
| 700 srcbuf += run * 4; \ | |
| 701 ofs += run; \ | |
| 702 } \ | |
| 703 } while(ofs < w); \ | |
| 704 dstbuf += dst->pitch; \ | |
| 705 } while(--linecount); \ | |
| 706 } while(0) | |
| 707 | |
| 708 switch(df->BytesPerPixel) { | |
| 709 case 2: | |
| 710 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 711 || df->Bmask == 0x07e0) | |
| 712 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 713 else | |
| 714 RLEALPHACLIPBLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 715 break; | |
| 716 case 4: | |
| 717 RLEALPHACLIPBLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 718 break; | |
| 719 } | |
| 720 } | |
| 721 | |
| 722 /* blit a pixel-alpha RLE surface */ | |
| 723 int SDL_RLEAlphaBlit(SDL_Surface *src, SDL_Rect *srcrect, | |
| 724 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 725 { | |
| 726 int x, y; | |
| 727 int w = src->w; | |
| 728 Uint8 *srcbuf, *dstbuf; | |
| 729 SDL_PixelFormat *df = dst->format; | |
| 730 | |
| 731 /* Lock the destination if necessary */ | |
|
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732 if ( SDL_MUSTLOCK(dst) ) { |
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733 if ( SDL_LockSurface(dst) < 0 ) { |
| 0 | 734 return -1; |
| 735 } | |
| 736 } | |
| 737 | |
| 738 x = dstrect->x; | |
| 739 y = dstrect->y; | |
|
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740 dstbuf = (Uint8 *)dst->pixels |
| 0 | 741 + y * dst->pitch + x * df->BytesPerPixel; |
| 742 srcbuf = (Uint8 *)src->map->sw_data->aux_data + sizeof(RLEDestFormat); | |
| 743 | |
| 744 { | |
| 745 /* skip lines at the top if necessary */ | |
| 746 int vskip = srcrect->y; | |
| 747 if(vskip) { | |
| 748 int ofs; | |
| 749 if(df->BytesPerPixel == 2) { | |
| 750 /* the 16/32 interleaved format */ | |
| 751 do { | |
| 752 /* skip opaque line */ | |
| 753 ofs = 0; | |
| 754 do { | |
| 755 int run; | |
| 756 ofs += srcbuf[0]; | |
| 757 run = srcbuf[1]; | |
| 758 srcbuf += 2; | |
| 759 if(run) { | |
| 760 srcbuf += 2 * run; | |
| 761 ofs += run; | |
| 762 } else if(!ofs) | |
| 763 goto done; | |
| 764 } while(ofs < w); | |
| 765 | |
| 766 /* skip padding */ | |
| 767 srcbuf += (unsigned long)srcbuf & 2; | |
| 768 | |
| 769 /* skip translucent line */ | |
| 770 ofs = 0; | |
| 771 do { | |
| 772 int run; | |
| 773 ofs += ((Uint16 *)srcbuf)[0]; | |
| 774 run = ((Uint16 *)srcbuf)[1]; | |
| 775 srcbuf += 4 * (run + 1); | |
| 776 ofs += run; | |
| 777 } while(ofs < w); | |
| 778 } while(--vskip); | |
| 779 } else { | |
| 780 /* the 32/32 interleaved format */ | |
| 781 vskip <<= 1; /* opaque and translucent have same format */ | |
| 782 do { | |
| 783 ofs = 0; | |
| 784 do { | |
| 785 int run; | |
| 786 ofs += ((Uint16 *)srcbuf)[0]; | |
| 787 run = ((Uint16 *)srcbuf)[1]; | |
| 788 srcbuf += 4; | |
| 789 if(run) { | |
| 790 srcbuf += 4 * run; | |
| 791 ofs += run; | |
| 792 } else if(!ofs) | |
| 793 goto done; | |
| 794 } while(ofs < w); | |
| 795 } while(--vskip); | |
| 796 } | |
| 797 } | |
| 798 } | |
| 799 | |
| 800 /* if left or right edge clipping needed, call clip blit */ | |
| 801 if(srcrect->x || srcrect->w != src->w) { | |
| 802 RLEAlphaClipBlit(w, srcbuf, dst, dstbuf, srcrect); | |
| 803 } else { | |
| 804 | |
| 805 /* | |
| 806 * non-clipped blitter. Ptype is the destination pixel type, | |
| 807 * Ctype the translucent count type, and do_blend the | |
| 808 * macro to blend one pixel. | |
| 809 */ | |
| 810 #define RLEALPHABLIT(Ptype, Ctype, do_blend) \ | |
| 811 do { \ | |
| 812 int linecount = srcrect->h; \ | |
| 813 do { \ | |
| 814 int ofs = 0; \ | |
| 815 /* blit opaque pixels on one line */ \ | |
| 816 do { \ | |
| 817 unsigned run; \ | |
| 818 ofs += ((Ctype *)srcbuf)[0]; \ | |
| 819 run = ((Ctype *)srcbuf)[1]; \ | |
| 820 srcbuf += 2 * sizeof(Ctype); \ | |
| 821 if(run) { \ | |
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|
822 PIXEL_COPY(dstbuf + ofs * sizeof(Ptype), srcbuf, \ |
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|
823 run, sizeof(Ptype)); \ |
| 0 | 824 srcbuf += run * sizeof(Ptype); \ |
| 825 ofs += run; \ | |
| 826 } else if(!ofs) \ | |
| 827 goto done; \ | |
| 828 } while(ofs < w); \ | |
| 829 /* skip padding if necessary */ \ | |
| 830 if(sizeof(Ptype) == 2) \ | |
| 831 srcbuf += (unsigned long)srcbuf & 2; \ | |
| 832 /* blit translucent pixels on the same line */ \ | |
| 833 ofs = 0; \ | |
| 834 do { \ | |
| 835 unsigned run; \ | |
| 836 ofs += ((Uint16 *)srcbuf)[0]; \ | |
| 837 run = ((Uint16 *)srcbuf)[1]; \ | |
| 838 srcbuf += 4; \ | |
| 839 if(run) { \ | |
| 840 Ptype *dst = (Ptype *)dstbuf + ofs; \ | |
| 841 unsigned i; \ | |
| 842 for(i = 0; i < run; i++) { \ | |
| 843 Uint32 src = *(Uint32 *)srcbuf; \ | |
| 844 do_blend(src, *dst); \ | |
| 845 srcbuf += 4; \ | |
| 846 dst++; \ | |
| 847 } \ | |
| 848 ofs += run; \ | |
| 849 } \ | |
| 850 } while(ofs < w); \ | |
| 851 dstbuf += dst->pitch; \ | |
| 852 } while(--linecount); \ | |
| 853 } while(0) | |
| 854 | |
| 855 switch(df->BytesPerPixel) { | |
| 856 case 2: | |
| 857 if(df->Gmask == 0x07e0 || df->Rmask == 0x07e0 | |
| 858 || df->Bmask == 0x07e0) | |
| 859 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_565); | |
| 860 else | |
| 861 RLEALPHABLIT(Uint16, Uint8, BLIT_TRANSL_555); | |
| 862 break; | |
| 863 case 4: | |
| 864 RLEALPHABLIT(Uint32, Uint16, BLIT_TRANSL_888); | |
| 865 break; | |
| 866 } | |
| 867 } | |
| 868 | |
| 869 done: | |
| 870 /* Unlock the destination if necessary */ | |
|
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871 if ( SDL_MUSTLOCK(dst) ) { |
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872 SDL_UnlockSurface(dst); |
| 0 | 873 } |
| 874 return 0; | |
| 875 } | |
| 876 | |
| 877 /* | |
| 878 * Auxiliary functions: | |
| 879 * The encoding functions take 32bpp rgb + a, and | |
| 880 * return the number of bytes copied to the destination. | |
| 881 * The decoding functions copy to 32bpp rgb + a, and | |
| 882 * return the number of bytes copied from the source. | |
| 883 * These are only used in the encoder and un-RLE code and are therefore not | |
| 884 * highly optimised. | |
| 885 */ | |
| 886 | |
| 887 /* encode 32bpp rgb + a into 16bpp rgb, losing alpha */ | |
| 888 static int copy_opaque_16(void *dst, Uint32 *src, int n, | |
| 889 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 890 { | |
| 891 int i; | |
| 892 Uint16 *d = dst; | |
| 893 for(i = 0; i < n; i++) { | |
| 894 unsigned r, g, b; | |
| 895 RGB_FROM_PIXEL(*src, sfmt, r, g, b); | |
| 896 PIXEL_FROM_RGB(*d, dfmt, r, g, b); | |
| 897 src++; | |
| 898 d++; | |
| 899 } | |
| 900 return n * 2; | |
| 901 } | |
| 902 | |
| 903 /* decode opaque pixels from 16bpp to 32bpp rgb + a */ | |
| 904 static int uncopy_opaque_16(Uint32 *dst, void *src, int n, | |
| 905 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 906 { | |
| 907 int i; | |
| 908 Uint16 *s = src; | |
| 909 unsigned alpha = dfmt->Amask ? 255 : 0; | |
| 910 for(i = 0; i < n; i++) { | |
| 911 unsigned r, g, b; | |
| 912 RGB_FROM_PIXEL(*s, sfmt, r, g, b); | |
| 913 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, alpha); | |
| 914 s++; | |
| 915 dst++; | |
| 916 } | |
| 917 return n * 2; | |
| 918 } | |
| 919 | |
| 920 | |
| 921 | |
| 922 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 565 */ | |
| 923 static int copy_transl_565(void *dst, Uint32 *src, int n, | |
| 924 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 925 { | |
| 926 int i; | |
| 927 Uint32 *d = dst; | |
| 928 for(i = 0; i < n; i++) { | |
| 929 unsigned r, g, b, a; | |
| 930 Uint16 pix; | |
| 931 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 932 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 933 *d = ((pix & 0x7e0) << 16) | (pix & 0xf81f) | ((a << 2) & 0x7e0); | |
| 934 src++; | |
| 935 d++; | |
| 936 } | |
| 937 return n * 4; | |
| 938 } | |
| 939 | |
| 940 /* encode 32bpp rgb + a into 32bpp G0RAB format for blitting into 555 */ | |
| 941 static int copy_transl_555(void *dst, Uint32 *src, int n, | |
| 942 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 943 { | |
| 944 int i; | |
| 945 Uint32 *d = dst; | |
| 946 for(i = 0; i < n; i++) { | |
| 947 unsigned r, g, b, a; | |
| 948 Uint16 pix; | |
| 949 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 950 PIXEL_FROM_RGB(pix, dfmt, r, g, b); | |
| 951 *d = ((pix & 0x3e0) << 16) | (pix & 0xfc1f) | ((a << 2) & 0x3e0); | |
| 952 src++; | |
| 953 d++; | |
| 954 } | |
| 955 return n * 4; | |
| 956 } | |
| 957 | |
| 958 /* decode translucent pixels from 32bpp GORAB to 32bpp rgb + a */ | |
| 959 static int uncopy_transl_16(Uint32 *dst, void *src, int n, | |
| 960 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 961 { | |
| 962 int i; | |
| 963 Uint32 *s = src; | |
| 964 for(i = 0; i < n; i++) { | |
| 965 unsigned r, g, b, a; | |
| 966 Uint32 pix = *s++; | |
| 967 a = (pix & 0x3e0) >> 2; | |
| 968 pix = (pix & ~0x3e0) | pix >> 16; | |
| 969 RGB_FROM_PIXEL(pix, sfmt, r, g, b); | |
| 970 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 971 dst++; | |
| 972 } | |
| 973 return n * 4; | |
| 974 } | |
| 975 | |
| 976 /* encode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 977 static int copy_32(void *dst, Uint32 *src, int n, | |
| 978 SDL_PixelFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 979 { | |
| 980 int i; | |
| 981 Uint32 *d = dst; | |
| 982 for(i = 0; i < n; i++) { | |
| 983 unsigned r, g, b, a; | |
| 984 Uint32 pixel; | |
| 985 RGBA_FROM_8888(*src, sfmt, r, g, b, a); | |
| 986 PIXEL_FROM_RGB(pixel, dfmt, r, g, b); | |
| 987 *d++ = pixel | a << 24; | |
| 988 src++; | |
| 989 } | |
| 990 return n * 4; | |
| 991 } | |
| 992 | |
| 993 /* decode 32bpp rgba into 32bpp rgba, keeping alpha (dual purpose) */ | |
| 994 static int uncopy_32(Uint32 *dst, void *src, int n, | |
| 995 RLEDestFormat *sfmt, SDL_PixelFormat *dfmt) | |
| 996 { | |
| 997 int i; | |
| 998 Uint32 *s = src; | |
| 999 for(i = 0; i < n; i++) { | |
| 1000 unsigned r, g, b, a; | |
| 1001 Uint32 pixel = *s++; | |
| 1002 RGB_FROM_PIXEL(pixel, sfmt, r, g, b); | |
| 1003 a = pixel >> 24; | |
| 1004 PIXEL_FROM_RGBA(*dst, dfmt, r, g, b, a); | |
| 1005 dst++; | |
| 1006 } | |
| 1007 return n * 4; | |
| 1008 } | |
| 1009 | |
| 1010 #define ISOPAQUE(pixel, fmt) ((((pixel) & fmt->Amask) >> fmt->Ashift) == 255) | |
| 1011 | |
| 1012 #define ISTRANSL(pixel, fmt) \ | |
| 1013 ((unsigned)((((pixel) & fmt->Amask) >> fmt->Ashift) - 1U) < 254U) | |
| 1014 | |
| 1015 /* convert surface to be quickly alpha-blittable onto dest, if possible */ | |
| 1016 static int RLEAlphaSurface(SDL_Surface *surface) | |
| 1017 { | |
| 1018 SDL_Surface *dest; | |
| 1019 SDL_PixelFormat *df; | |
| 1020 int maxsize = 0; | |
| 1021 int max_opaque_run; | |
| 1022 int max_transl_run = 65535; | |
| 1023 unsigned masksum; | |
| 1024 Uint8 *rlebuf, *dst; | |
| 1025 int (*copy_opaque)(void *, Uint32 *, int, | |
| 1026 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1027 int (*copy_transl)(void *, Uint32 *, int, | |
| 1028 SDL_PixelFormat *, SDL_PixelFormat *); | |
| 1029 | |
| 1030 dest = surface->map->dst; | |
| 1031 if(!dest) | |
| 1032 return -1; | |
| 1033 df = dest->format; | |
| 1034 if(surface->format->BitsPerPixel != 32) | |
| 1035 return -1; /* only 32bpp source supported */ | |
| 1036 | |
| 1037 /* find out whether the destination is one we support, | |
| 1038 and determine the max size of the encoded result */ | |
| 1039 masksum = df->Rmask | df->Gmask | df->Bmask; | |
| 1040 switch(df->BytesPerPixel) { | |
| 1041 case 2: | |
| 1042 /* 16bpp: only support 565 and 555 formats */ | |
| 1043 switch(masksum) { | |
| 1044 case 0xffff: | |
| 1045 if(df->Gmask == 0x07e0 | |
| 1046 || df->Rmask == 0x07e0 || df->Bmask == 0x07e0) { | |
| 1047 copy_opaque = copy_opaque_16; | |
| 1048 copy_transl = copy_transl_565; | |
| 1049 } else | |
| 1050 return -1; | |
| 1051 break; | |
| 1052 case 0x7fff: | |
| 1053 if(df->Gmask == 0x03e0 | |
| 1054 || df->Rmask == 0x03e0 || df->Bmask == 0x03e0) { | |
| 1055 copy_opaque = copy_opaque_16; | |
| 1056 copy_transl = copy_transl_555; | |
| 1057 } else | |
| 1058 return -1; | |
| 1059 break; | |
| 1060 default: | |
| 1061 return -1; | |
| 1062 } | |
| 1063 max_opaque_run = 255; /* runs stored as bytes */ | |
| 1064 | |
| 1065 /* worst case is alternating opaque and translucent pixels, | |
| 1066 with room for alignment padding between lines */ | |
| 1067 maxsize = surface->h * (2 + (4 + 2) * (surface->w + 1)) + 2; | |
| 1068 break; | |
| 1069 case 4: | |
| 1070 if(masksum != 0x00ffffff) | |
| 1071 return -1; /* requires unused high byte */ | |
| 1072 copy_opaque = copy_32; | |
| 1073 copy_transl = copy_32; | |
| 1074 max_opaque_run = 255; /* runs stored as short ints */ | |
| 1075 | |
| 1076 /* worst case is alternating opaque and translucent pixels */ | |
| 1077 maxsize = surface->h * 2 * 4 * (surface->w + 1) + 4; | |
| 1078 break; | |
| 1079 default: | |
| 1080 return -1; /* anything else unsupported right now */ | |
| 1081 } | |
| 1082 | |
| 1083 maxsize += sizeof(RLEDestFormat); | |
| 1084 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1085 if(!rlebuf) { | |
| 1086 SDL_OutOfMemory(); | |
| 1087 return -1; | |
| 1088 } | |
| 1089 { | |
| 1090 /* save the destination format so we can undo the encoding later */ | |
| 1091 RLEDestFormat *r = (RLEDestFormat *)rlebuf; | |
| 1092 r->BytesPerPixel = df->BytesPerPixel; | |
| 1093 r->Rloss = df->Rloss; | |
| 1094 r->Gloss = df->Gloss; | |
| 1095 r->Bloss = df->Bloss; | |
| 1096 r->Rshift = df->Rshift; | |
| 1097 r->Gshift = df->Gshift; | |
| 1098 r->Bshift = df->Bshift; | |
| 1099 r->Ashift = df->Ashift; | |
| 1100 r->Rmask = df->Rmask; | |
| 1101 r->Gmask = df->Gmask; | |
| 1102 r->Bmask = df->Bmask; | |
| 1103 r->Amask = df->Amask; | |
| 1104 } | |
| 1105 dst = rlebuf + sizeof(RLEDestFormat); | |
| 1106 | |
| 1107 /* Do the actual encoding */ | |
| 1108 { | |
| 1109 int x, y; | |
| 1110 int h = surface->h, w = surface->w; | |
| 1111 SDL_PixelFormat *sf = surface->format; | |
|
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1112 Uint32 *src = (Uint32 *)surface->pixels; |
| 0 | 1113 Uint8 *lastline = dst; /* end of last non-blank line */ |
| 1114 | |
| 1115 /* opaque counts are 8 or 16 bits, depending on target depth */ | |
| 1116 #define ADD_OPAQUE_COUNTS(n, m) \ | |
| 1117 if(df->BytesPerPixel == 4) { \ | |
| 1118 ((Uint16 *)dst)[0] = n; \ | |
| 1119 ((Uint16 *)dst)[1] = m; \ | |
| 1120 dst += 4; \ | |
| 1121 } else { \ | |
| 1122 dst[0] = n; \ | |
| 1123 dst[1] = m; \ | |
| 1124 dst += 2; \ | |
| 1125 } | |
| 1126 | |
| 1127 /* translucent counts are always 16 bit */ | |
| 1128 #define ADD_TRANSL_COUNTS(n, m) \ | |
| 1129 (((Uint16 *)dst)[0] = n, ((Uint16 *)dst)[1] = m, dst += 4) | |
| 1130 | |
| 1131 for(y = 0; y < h; y++) { | |
| 1132 int runstart, skipstart; | |
| 1133 int blankline = 0; | |
| 1134 /* First encode all opaque pixels of a scan line */ | |
| 1135 x = 0; | |
| 1136 do { | |
| 1137 int run, skip, len; | |
| 1138 skipstart = x; | |
| 1139 while(x < w && !ISOPAQUE(src[x], sf)) | |
| 1140 x++; | |
| 1141 runstart = x; | |
| 1142 while(x < w && ISOPAQUE(src[x], sf)) | |
| 1143 x++; | |
| 1144 skip = runstart - skipstart; | |
| 1145 if(skip == w) | |
| 1146 blankline = 1; | |
| 1147 run = x - runstart; | |
| 1148 while(skip > max_opaque_run) { | |
| 1149 ADD_OPAQUE_COUNTS(max_opaque_run, 0); | |
| 1150 skip -= max_opaque_run; | |
| 1151 } | |
| 1152 len = MIN(run, max_opaque_run); | |
| 1153 ADD_OPAQUE_COUNTS(skip, len); | |
| 1154 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1155 runstart += len; | |
| 1156 run -= len; | |
| 1157 while(run) { | |
| 1158 len = MIN(run, max_opaque_run); | |
| 1159 ADD_OPAQUE_COUNTS(0, len); | |
| 1160 dst += copy_opaque(dst, src + runstart, len, sf, df); | |
| 1161 runstart += len; | |
| 1162 run -= len; | |
| 1163 } | |
| 1164 } while(x < w); | |
| 1165 | |
| 1166 /* Make sure the next output address is 32-bit aligned */ | |
| 1167 dst += (unsigned long)dst & 2; | |
| 1168 | |
| 1169 /* Next, encode all translucent pixels of the same scan line */ | |
| 1170 x = 0; | |
| 1171 do { | |
| 1172 int run, skip, len; | |
| 1173 skipstart = x; | |
| 1174 while(x < w && !ISTRANSL(src[x], sf)) | |
| 1175 x++; | |
| 1176 runstart = x; | |
| 1177 while(x < w && ISTRANSL(src[x], sf)) | |
| 1178 x++; | |
| 1179 skip = runstart - skipstart; | |
| 1180 blankline &= (skip == w); | |
| 1181 run = x - runstart; | |
| 1182 while(skip > max_transl_run) { | |
| 1183 ADD_TRANSL_COUNTS(max_transl_run, 0); | |
| 1184 skip -= max_transl_run; | |
| 1185 } | |
| 1186 len = MIN(run, max_transl_run); | |
| 1187 ADD_TRANSL_COUNTS(skip, len); | |
| 1188 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1189 runstart += len; | |
| 1190 run -= len; | |
| 1191 while(run) { | |
| 1192 len = MIN(run, max_transl_run); | |
| 1193 ADD_TRANSL_COUNTS(0, len); | |
| 1194 dst += copy_transl(dst, src + runstart, len, sf, df); | |
| 1195 runstart += len; | |
| 1196 run -= len; | |
| 1197 } | |
| 1198 if(!blankline) | |
| 1199 lastline = dst; | |
| 1200 } while(x < w); | |
| 1201 | |
| 1202 src += surface->pitch >> 2; | |
| 1203 } | |
| 1204 dst = lastline; /* back up past trailing blank lines */ | |
| 1205 ADD_OPAQUE_COUNTS(0, 0); | |
| 1206 } | |
| 1207 | |
| 1208 #undef ADD_OPAQUE_COUNTS | |
| 1209 #undef ADD_TRANSL_COUNTS | |
| 1210 | |
| 1211 /* Now that we have it encoded, release the original pixels */ | |
| 1212 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1213 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1214 free( surface->pixels ); | |
| 1215 surface->pixels = NULL; | |
| 1216 } | |
| 1217 | |
| 1218 /* realloc the buffer to release unused memory */ | |
| 1219 { | |
| 1220 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1221 if(!p) | |
| 1222 p = rlebuf; | |
| 1223 surface->map->sw_data->aux_data = p; | |
| 1224 } | |
| 1225 | |
| 1226 return 0; | |
| 1227 } | |
| 1228 | |
| 1229 static Uint32 getpix_8(Uint8 *srcbuf) | |
| 1230 { | |
| 1231 return *srcbuf; | |
| 1232 } | |
| 1233 | |
| 1234 static Uint32 getpix_16(Uint8 *srcbuf) | |
| 1235 { | |
| 1236 return *(Uint16 *)srcbuf; | |
| 1237 } | |
| 1238 | |
| 1239 static Uint32 getpix_24(Uint8 *srcbuf) | |
| 1240 { | |
| 1241 if(SDL_BYTEORDER == SDL_LIL_ENDIAN) | |
| 1242 return srcbuf[0] + (srcbuf[1] << 8) + (srcbuf[2] << 16); | |
| 1243 else | |
| 1244 return (srcbuf[0] << 16) + (srcbuf[1] << 8) + srcbuf[2]; | |
| 1245 } | |
| 1246 | |
| 1247 static Uint32 getpix_32(Uint8 *srcbuf) | |
| 1248 { | |
| 1249 return *(Uint32 *)srcbuf; | |
| 1250 } | |
| 1251 | |
| 1252 typedef Uint32 (*getpix_func)(Uint8 *); | |
| 1253 | |
| 1254 static getpix_func getpixes[4] = { | |
| 1255 getpix_8, getpix_16, getpix_24, getpix_32 | |
| 1256 }; | |
| 1257 | |
| 1258 static int RLEColorkeySurface(SDL_Surface *surface) | |
| 1259 { | |
| 1260 Uint8 *rlebuf, *dst; | |
| 1261 int maxn; | |
| 1262 int y; | |
| 1263 Uint8 *srcbuf, *curbuf, *lastline; | |
| 1264 int maxsize = 0; | |
| 1265 int skip, run; | |
| 1266 int bpp = surface->format->BytesPerPixel; | |
| 1267 getpix_func getpix; | |
| 1268 Uint32 ckey, rgbmask; | |
| 1269 int w, h; | |
| 1270 | |
| 1271 /* calculate the worst case size for the compressed surface */ | |
| 1272 switch(bpp) { | |
| 1273 case 1: | |
| 1274 /* worst case is alternating opaque and transparent pixels, | |
| 1275 starting with an opaque pixel */ | |
| 1276 maxsize = surface->h * 3 * (surface->w / 2 + 1) + 2; | |
| 1277 break; | |
| 1278 case 2: | |
| 1279 case 3: | |
| 1280 /* worst case is solid runs, at most 255 pixels wide */ | |
| 1281 maxsize = surface->h * (2 * (surface->w / 255 + 1) | |
| 1282 + surface->w * bpp) + 2; | |
| 1283 break; | |
| 1284 case 4: | |
| 1285 /* worst case is solid runs, at most 65535 pixels wide */ | |
| 1286 maxsize = surface->h * (4 * (surface->w / 65535 + 1) | |
| 1287 + surface->w * 4) + 4; | |
| 1288 break; | |
| 1289 } | |
| 1290 | |
| 1291 rlebuf = (Uint8 *)malloc(maxsize); | |
| 1292 if ( rlebuf == NULL ) { | |
| 1293 SDL_OutOfMemory(); | |
| 1294 return(-1); | |
| 1295 } | |
| 1296 | |
| 1297 /* Set up the conversion */ | |
|
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parents:
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diff
changeset
|
1298 srcbuf = (Uint8 *)surface->pixels; |
| 0 | 1299 curbuf = srcbuf; |
| 1300 maxn = bpp == 4 ? 65535 : 255; | |
| 1301 skip = run = 0; | |
| 1302 dst = rlebuf; | |
| 1303 rgbmask = ~surface->format->Amask; | |
| 1304 ckey = surface->format->colorkey & rgbmask; | |
| 1305 lastline = dst; | |
| 1306 getpix = getpixes[bpp - 1]; | |
| 1307 w = surface->w; | |
| 1308 h = surface->h; | |
| 1309 | |
| 1310 #define ADD_COUNTS(n, m) \ | |
| 1311 if(bpp == 4) { \ | |
| 1312 ((Uint16 *)dst)[0] = n; \ | |
| 1313 ((Uint16 *)dst)[1] = m; \ | |
| 1314 dst += 4; \ | |
| 1315 } else { \ | |
| 1316 dst[0] = n; \ | |
| 1317 dst[1] = m; \ | |
| 1318 dst += 2; \ | |
| 1319 } | |
| 1320 | |
| 1321 for(y = 0; y < h; y++) { | |
| 1322 int x = 0; | |
| 1323 int blankline = 0; | |
| 1324 do { | |
| 1325 int run, skip, len; | |
| 1326 int runstart; | |
| 1327 int skipstart = x; | |
| 1328 | |
| 1329 /* find run of transparent, then opaque pixels */ | |
| 1330 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) == ckey) | |
| 1331 x++; | |
| 1332 runstart = x; | |
| 1333 while(x < w && (getpix(srcbuf + x * bpp) & rgbmask) != ckey) | |
| 1334 x++; | |
| 1335 skip = runstart - skipstart; | |
| 1336 if(skip == w) | |
| 1337 blankline = 1; | |
| 1338 run = x - runstart; | |
| 1339 | |
| 1340 /* encode segment */ | |
| 1341 while(skip > maxn) { | |
| 1342 ADD_COUNTS(maxn, 0); | |
| 1343 skip -= maxn; | |
| 1344 } | |
| 1345 len = MIN(run, maxn); | |
| 1346 ADD_COUNTS(skip, len); | |
| 1347 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1348 dst += len * bpp; | |
| 1349 run -= len; | |
| 1350 runstart += len; | |
| 1351 while(run) { | |
| 1352 len = MIN(run, maxn); | |
| 1353 ADD_COUNTS(0, len); | |
| 1354 memcpy(dst, srcbuf + runstart * bpp, len * bpp); | |
| 1355 dst += len * bpp; | |
| 1356 runstart += len; | |
| 1357 run -= len; | |
| 1358 } | |
| 1359 if(!blankline) | |
| 1360 lastline = dst; | |
| 1361 } while(x < w); | |
| 1362 | |
| 1363 srcbuf += surface->pitch; | |
| 1364 } | |
| 1365 dst = lastline; /* back up bast trailing blank lines */ | |
| 1366 ADD_COUNTS(0, 0); | |
| 1367 | |
| 1368 #undef ADD_COUNTS | |
| 1369 | |
| 1370 /* Now that we have it encoded, release the original pixels */ | |
| 1371 if((surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1372 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1373 free( surface->pixels ); | |
| 1374 surface->pixels = NULL; | |
| 1375 } | |
| 1376 | |
| 1377 /* realloc the buffer to release unused memory */ | |
| 1378 { | |
| 1379 /* If realloc returns NULL, the original block is left intact */ | |
| 1380 Uint8 *p = realloc(rlebuf, dst - rlebuf); | |
| 1381 if(!p) | |
| 1382 p = rlebuf; | |
| 1383 surface->map->sw_data->aux_data = p; | |
| 1384 } | |
| 1385 | |
| 1386 return(0); | |
| 1387 } | |
| 1388 | |
| 1389 int SDL_RLESurface(SDL_Surface *surface) | |
| 1390 { | |
| 1391 int retcode; | |
| 1392 | |
| 1393 /* Clear any previous RLE conversion */ | |
| 1394 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1395 SDL_UnRLESurface(surface, 1); | |
| 1396 } | |
| 1397 | |
| 1398 /* We don't support RLE encoding of bitmaps */ | |
| 1399 if ( surface->format->BitsPerPixel < 8 ) { | |
| 1400 return(-1); | |
| 1401 } | |
| 1402 | |
| 1403 /* Lock the surface if it's in hardware */ | |
|
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|
1404 if ( SDL_MUSTLOCK(surface) ) { |
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parents:
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diff
changeset
|
1405 if ( SDL_LockSurface(surface) < 0 ) { |
| 0 | 1406 return(-1); |
| 1407 } | |
| 1408 } | |
| 1409 | |
| 1410 /* Encode */ | |
| 1411 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1412 retcode = RLEColorkeySurface(surface); | |
| 1413 } else { | |
| 1414 if((surface->flags & SDL_SRCALPHA) == SDL_SRCALPHA | |
| 1415 && surface->format->Amask != 0) | |
| 1416 retcode = RLEAlphaSurface(surface); | |
| 1417 else | |
| 1418 retcode = -1; /* no RLE for per-surface alpha sans ckey */ | |
| 1419 } | |
| 1420 | |
| 1421 /* Unlock the surface if it's in hardware */ | |
|
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parents:
297
diff
changeset
|
1422 if ( SDL_MUSTLOCK(surface) ) { |
|
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parents:
297
diff
changeset
|
1423 SDL_UnlockSurface(surface); |
| 0 | 1424 } |
| 1425 | |
| 1426 if(retcode < 0) | |
| 1427 return -1; | |
| 1428 | |
| 1429 /* The surface is now accelerated */ | |
| 1430 surface->flags |= SDL_RLEACCEL; | |
| 1431 | |
| 1432 return(0); | |
| 1433 } | |
| 1434 | |
| 1435 /* | |
| 1436 * Un-RLE a surface with pixel alpha | |
| 1437 * This may not give back exactly the image before RLE-encoding; all | |
| 1438 * completely transparent pixels will be lost, and colour and alpha depth | |
| 1439 * may have been reduced (when encoding for 16bpp targets). | |
| 1440 */ | |
| 1441 static void UnRLEAlpha(SDL_Surface *surface) | |
| 1442 { | |
| 1443 Uint8 *srcbuf; | |
| 1444 Uint32 *dst; | |
| 1445 SDL_PixelFormat *sf = surface->format; | |
| 1446 RLEDestFormat *df = surface->map->sw_data->aux_data; | |
| 1447 int (*uncopy_opaque)(Uint32 *, void *, int, | |
| 1448 RLEDestFormat *, SDL_PixelFormat *); | |
| 1449 int (*uncopy_transl)(Uint32 *, void *, int, | |
| 1450 RLEDestFormat *, SDL_PixelFormat *); | |
| 1451 int w = surface->w; | |
| 1452 int bpp = df->BytesPerPixel; | |
| 1453 | |
| 1454 if(bpp == 2) { | |
| 1455 uncopy_opaque = uncopy_opaque_16; | |
| 1456 uncopy_transl = uncopy_transl_16; | |
| 1457 } else { | |
| 1458 uncopy_opaque = uncopy_transl = uncopy_32; | |
| 1459 } | |
| 1460 | |
| 1461 surface->pixels = malloc(surface->h * surface->pitch); | |
| 1462 /* fill background with transparent pixels */ | |
| 1463 memset(surface->pixels, 0, surface->h * surface->pitch); | |
| 1464 | |
| 1465 dst = surface->pixels; | |
| 1466 srcbuf = (Uint8 *)(df + 1); | |
| 1467 for(;;) { | |
| 1468 /* copy opaque pixels */ | |
| 1469 int ofs = 0; | |
| 1470 do { | |
| 1471 unsigned run; | |
| 1472 if(bpp == 2) { | |
| 1473 ofs += srcbuf[0]; | |
| 1474 run = srcbuf[1]; | |
| 1475 srcbuf += 2; | |
| 1476 } else { | |
| 1477 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1478 run = ((Uint16 *)srcbuf)[1]; | |
| 1479 srcbuf += 4; | |
| 1480 } | |
| 1481 if(run) { | |
| 1482 srcbuf += uncopy_opaque(dst + ofs, srcbuf, run, df, sf); | |
| 1483 ofs += run; | |
| 1484 } else if(!ofs) | |
| 1485 return; | |
| 1486 } while(ofs < w); | |
| 1487 | |
| 1488 /* skip padding if needed */ | |
| 1489 if(bpp == 2) | |
| 1490 srcbuf += (unsigned long)srcbuf & 2; | |
| 1491 | |
| 1492 /* copy translucent pixels */ | |
| 1493 ofs = 0; | |
| 1494 do { | |
| 1495 unsigned run; | |
| 1496 ofs += ((Uint16 *)srcbuf)[0]; | |
| 1497 run = ((Uint16 *)srcbuf)[1]; | |
| 1498 srcbuf += 4; | |
| 1499 if(run) { | |
| 1500 srcbuf += uncopy_transl(dst + ofs, srcbuf, run, df, sf); | |
| 1501 ofs += run; | |
| 1502 } | |
| 1503 } while(ofs < w); | |
| 1504 dst += surface->pitch >> 2; | |
| 1505 } | |
| 1506 } | |
| 1507 | |
| 1508 void SDL_UnRLESurface(SDL_Surface *surface, int recode) | |
| 1509 { | |
| 1510 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 1511 surface->flags &= ~SDL_RLEACCEL; | |
| 1512 | |
| 1513 if(recode && (surface->flags & SDL_PREALLOC) != SDL_PREALLOC | |
| 1514 && (surface->flags & SDL_HWSURFACE) != SDL_HWSURFACE) { | |
| 1515 if((surface->flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY) { | |
| 1516 SDL_Rect full; | |
| 1517 unsigned alpha_flag; | |
| 1518 | |
| 1519 /* re-create the original surface */ | |
| 1520 surface->pixels = malloc(surface->h * surface->pitch); | |
| 1521 | |
| 1522 /* fill it with the background colour */ | |
| 1523 SDL_FillRect(surface, NULL, surface->format->colorkey); | |
| 1524 | |
| 1525 /* now render the encoded surface */ | |
| 1526 full.x = full.y = 0; | |
| 1527 full.w = surface->w; | |
| 1528 full.h = surface->h; | |
| 1529 alpha_flag = surface->flags & SDL_SRCALPHA; | |
| 1530 surface->flags &= ~SDL_SRCALPHA; /* opaque blit */ | |
| 1531 SDL_RLEBlit(surface, &full, surface, &full); | |
| 1532 surface->flags |= alpha_flag; | |
| 1533 } else | |
| 1534 UnRLEAlpha(surface); | |
| 1535 } | |
| 1536 | |
| 1537 if ( surface->map && surface->map->sw_data->aux_data ) { | |
| 1538 free(surface->map->sw_data->aux_data); | |
| 1539 surface->map->sw_data->aux_data = NULL; | |
| 1540 } | |
| 1541 } | |
| 1542 } | |
| 1543 | |
| 1544 |