| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 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 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #include "SDL_video.h" |
| 25 | #include "SDL_blit.h" |
| 26 | |
| 27 | /* Functions to blit from bitmaps to other surfaces */ |
| 28 | |
| 29 | static void BlitBto1(SDL_BlitInfo *info) |
| 30 | { |
| 31 | int c; |
| 32 | int width, height; |
| 33 | Uint8 *src, *map, *dst; |
| 34 | int srcskip, dstskip; |
| 35 | |
| 36 | /* Set up some basic variables */ |
| 37 | width = info->d_width; |
| 38 | height = info->d_height; |
| 39 | src = info->s_pixels; |
| 40 | srcskip = info->s_skip; |
| 41 | dst = info->d_pixels; |
| 42 | dstskip = info->d_skip; |
| 43 | map = info->table; |
| 44 | srcskip += width-(width+7)/8; |
| 45 | |
| 46 | if ( map ) { |
| 47 | while ( height-- ) { |
| 48 | Uint8 byte = 0, bit; |
| 49 | for ( c=0; c<width; ++c ) { |
| 50 | if ( (c&7) == 0 ) { |
| 51 | byte = *src++; |
| 52 | } |
| 53 | bit = (byte&0x80)>>7; |
| 54 | if ( 1 ) { |
| 55 | *dst = map[bit]; |
| 56 | } |
| 57 | dst++; |
| 58 | byte <<= 1; |
| 59 | } |
| 60 | src += srcskip; |
| 61 | dst += dstskip; |
| 62 | } |
| 63 | } else { |
| 64 | while ( height-- ) { |
| 65 | Uint8 byte = 0, bit; |
| 66 | for ( c=0; c<width; ++c ) { |
| 67 | if ( (c&7) == 0 ) { |
| 68 | byte = *src++; |
| 69 | } |
| 70 | bit = (byte&0x80)>>7; |
| 71 | if ( 1 ) { |
| 72 | *dst = bit; |
| 73 | } |
| 74 | dst++; |
| 75 | byte <<= 1; |
| 76 | } |
| 77 | src += srcskip; |
| 78 | dst += dstskip; |
| 79 | } |
| 80 | } |
| 81 | } |
| 82 | static void BlitBto2(SDL_BlitInfo *info) |
| 83 | { |
| 84 | int c; |
| 85 | int width, height; |
| 86 | Uint8 *src; |
| 87 | Uint16 *map, *dst; |
| 88 | int srcskip, dstskip; |
| 89 | |
| 90 | /* Set up some basic variables */ |
| 91 | width = info->d_width; |
| 92 | height = info->d_height; |
| 93 | src = info->s_pixels; |
| 94 | srcskip = info->s_skip; |
| 95 | dst = (Uint16 *)info->d_pixels; |
| 96 | dstskip = info->d_skip/2; |
| 97 | map = (Uint16 *)info->table; |
| 98 | srcskip += width-(width+7)/8; |
| 99 | |
| 100 | while ( height-- ) { |
| 101 | Uint8 byte = 0, bit; |
| 102 | for ( c=0; c<width; ++c ) { |
| 103 | if ( (c&7) == 0 ) { |
| 104 | byte = *src++; |
| 105 | } |
| 106 | bit = (byte&0x80)>>7; |
| 107 | if ( 1 ) { |
| 108 | *dst = map[bit]; |
| 109 | } |
| 110 | byte <<= 1; |
| 111 | dst++; |
| 112 | } |
| 113 | src += srcskip; |
| 114 | dst += dstskip; |
| 115 | } |
| 116 | } |
| 117 | static void BlitBto3(SDL_BlitInfo *info) |
| 118 | { |
| 119 | int c, o; |
| 120 | int width, height; |
| 121 | Uint8 *src, *map, *dst; |
| 122 | int srcskip, dstskip; |
| 123 | |
| 124 | /* Set up some basic variables */ |
| 125 | width = info->d_width; |
| 126 | height = info->d_height; |
| 127 | src = info->s_pixels; |
| 128 | srcskip = info->s_skip; |
| 129 | dst = info->d_pixels; |
| 130 | dstskip = info->d_skip; |
| 131 | map = info->table; |
| 132 | srcskip += width-(width+7)/8; |
| 133 | |
| 134 | while ( height-- ) { |
| 135 | Uint8 byte = 0, bit; |
| 136 | for ( c=0; c<width; ++c ) { |
| 137 | if ( (c&7) == 0 ) { |
| 138 | byte = *src++; |
| 139 | } |
| 140 | bit = (byte&0x80)>>7; |
| 141 | if ( 1 ) { |
| 142 | o = bit * 4; |
| 143 | dst[0] = map[o++]; |
| 144 | dst[1] = map[o++]; |
| 145 | dst[2] = map[o++]; |
| 146 | } |
| 147 | byte <<= 1; |
| 148 | dst += 3; |
| 149 | } |
| 150 | src += srcskip; |
| 151 | dst += dstskip; |
| 152 | } |
| 153 | } |
| 154 | static void BlitBto4(SDL_BlitInfo *info) |
| 155 | { |
| 156 | int width, height; |
| 157 | Uint8 *src; |
| 158 | Uint32 *map, *dst; |
| 159 | int srcskip, dstskip; |
| 160 | int c; |
| 161 | |
| 162 | /* Set up some basic variables */ |
| 163 | width = info->d_width; |
| 164 | height = info->d_height; |
| 165 | src = info->s_pixels; |
| 166 | srcskip = info->s_skip; |
| 167 | dst = (Uint32 *)info->d_pixels; |
| 168 | dstskip = info->d_skip/4; |
| 169 | map = (Uint32 *)info->table; |
| 170 | srcskip += width-(width+7)/8; |
| 171 | |
| 172 | while ( height-- ) { |
| 173 | Uint8 byte = 0, bit; |
| 174 | for ( c=0; c<width; ++c ) { |
| 175 | if ( (c&7) == 0 ) { |
| 176 | byte = *src++; |
| 177 | } |
| 178 | bit = (byte&0x80)>>7; |
| 179 | if ( 1 ) { |
| 180 | *dst = map[bit]; |
| 181 | } |
| 182 | byte <<= 1; |
| 183 | dst++; |
| 184 | } |
| 185 | src += srcskip; |
| 186 | dst += dstskip; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | static void BlitBto1Key(SDL_BlitInfo *info) |
| 191 | { |
| 192 | int width = info->d_width; |
| 193 | int height = info->d_height; |
| 194 | Uint8 *src = info->s_pixels; |
| 195 | Uint8 *dst = info->d_pixels; |
| 196 | int srcskip = info->s_skip; |
| 197 | int dstskip = info->d_skip; |
| 198 | Uint32 ckey = info->src->colorkey; |
| 199 | Uint8 *palmap = info->table; |
| 200 | int c; |
| 201 | |
| 202 | /* Set up some basic variables */ |
| 203 | srcskip += width-(width+7)/8; |
| 204 | |
| 205 | if ( palmap ) { |
| 206 | while ( height-- ) { |
| 207 | Uint8 byte = 0, bit; |
| 208 | for ( c=0; c<width; ++c ) { |
| 209 | if ( (c&7) == 0 ) { |
| 210 | byte = *src++; |
| 211 | } |
| 212 | bit = (byte&0x80)>>7; |
| 213 | if ( bit != ckey ) { |
| 214 | *dst = palmap[bit]; |
| 215 | } |
| 216 | dst++; |
| 217 | byte <<= 1; |
| 218 | } |
| 219 | src += srcskip; |
| 220 | dst += dstskip; |
| 221 | } |
| 222 | } else { |
| 223 | while ( height-- ) { |
| 224 | Uint8 byte = 0, bit; |
| 225 | for ( c=0; c<width; ++c ) { |
| 226 | if ( (c&7) == 0 ) { |
| 227 | byte = *src++; |
| 228 | } |
| 229 | bit = (byte&0x80)>>7; |
| 230 | if ( bit != ckey ) { |
| 231 | *dst = bit; |
| 232 | } |
| 233 | dst++; |
| 234 | byte <<= 1; |
| 235 | } |
| 236 | src += srcskip; |
| 237 | dst += dstskip; |
| 238 | } |
| 239 | } |
| 240 | } |
| 241 | |
| 242 | static void BlitBto2Key(SDL_BlitInfo *info) |
| 243 | { |
| 244 | int width = info->d_width; |
| 245 | int height = info->d_height; |
| 246 | Uint8 *src = info->s_pixels; |
| 247 | Uint16 *dstp = (Uint16 *)info->d_pixels; |
| 248 | int srcskip = info->s_skip; |
| 249 | int dstskip = info->d_skip; |
| 250 | Uint32 ckey = info->src->colorkey; |
| 251 | Uint8 *palmap = info->table; |
| 252 | int c; |
| 253 | |
| 254 | /* Set up some basic variables */ |
| 255 | srcskip += width-(width+7)/8; |
| 256 | dstskip /= 2; |
| 257 | |
| 258 | while ( height-- ) { |
| 259 | Uint8 byte = 0, bit; |
| 260 | for ( c=0; c<width; ++c ) { |
| 261 | if ( (c&7) == 0 ) { |
| 262 | byte = *src++; |
| 263 | } |
| 264 | bit = (byte&0x80)>>7; |
| 265 | if ( bit != ckey ) { |
| 266 | *dstp=((Uint16 *)palmap)[bit]; |
| 267 | } |
| 268 | byte <<= 1; |
| 269 | dstp++; |
| 270 | } |
| 271 | src += srcskip; |
| 272 | dstp += dstskip; |
| 273 | } |
| 274 | } |
| 275 | |
| 276 | static void BlitBto3Key(SDL_BlitInfo *info) |
| 277 | { |
| 278 | int width = info->d_width; |
| 279 | int height = info->d_height; |
| 280 | Uint8 *src = info->s_pixels; |
| 281 | Uint8 *dst = info->d_pixels; |
| 282 | int srcskip = info->s_skip; |
| 283 | int dstskip = info->d_skip; |
| 284 | Uint32 ckey = info->src->colorkey; |
| 285 | Uint8 *palmap = info->table; |
| 286 | int c; |
| 287 | |
| 288 | /* Set up some basic variables */ |
| 289 | srcskip += width-(width+7)/8; |
| 290 | |
| 291 | while ( height-- ) { |
| 292 | Uint8 byte = 0, bit; |
| 293 | for ( c=0; c<width; ++c ) { |
| 294 | if ( (c&7) == 0 ) { |
| 295 | byte = *src++; |
| 296 | } |
| 297 | bit = (byte&0x80)>>7; |
| 298 | if ( bit != ckey ) { |
| 299 | SDL_memcpy(dst, &palmap[bit*4], 3); |
| 300 | } |
| 301 | byte <<= 1; |
| 302 | dst += 3; |
| 303 | } |
| 304 | src += srcskip; |
| 305 | dst += dstskip; |
| 306 | } |
| 307 | } |
| 308 | |
| 309 | static void BlitBto4Key(SDL_BlitInfo *info) |
| 310 | { |
| 311 | int width = info->d_width; |
| 312 | int height = info->d_height; |
| 313 | Uint8 *src = info->s_pixels; |
| 314 | Uint32 *dstp = (Uint32 *)info->d_pixels; |
| 315 | int srcskip = info->s_skip; |
| 316 | int dstskip = info->d_skip; |
| 317 | Uint32 ckey = info->src->colorkey; |
| 318 | Uint8 *palmap = info->table; |
| 319 | int c; |
| 320 | |
| 321 | /* Set up some basic variables */ |
| 322 | srcskip += width-(width+7)/8; |
| 323 | dstskip /= 4; |
| 324 | |
| 325 | while ( height-- ) { |
| 326 | Uint8 byte = 0, bit; |
| 327 | for ( c=0; c<width; ++c ) { |
| 328 | if ( (c&7) == 0 ) { |
| 329 | byte = *src++; |
| 330 | } |
| 331 | bit = (byte&0x80)>>7; |
| 332 | if ( bit != ckey ) { |
| 333 | *dstp=((Uint32 *)palmap)[bit]; |
| 334 | } |
| 335 | byte <<= 1; |
| 336 | dstp++; |
| 337 | } |
| 338 | src += srcskip; |
| 339 | dstp += dstskip; |
| 340 | } |
| 341 | } |
| 342 | |
| 343 | static void BlitBtoNAlpha(SDL_BlitInfo *info) |
| 344 | { |
| 345 | int width = info->d_width; |
| 346 | int height = info->d_height; |
| 347 | Uint8 *src = info->s_pixels; |
| 348 | Uint8 *dst = info->d_pixels; |
| 349 | int srcskip = info->s_skip; |
| 350 | int dstskip = info->d_skip; |
| 351 | const SDL_Color *srcpal = info->src->palette->colors; |
| 352 | SDL_PixelFormat *dstfmt = info->dst; |
| 353 | int dstbpp; |
| 354 | int c; |
| 355 | const int A = info->src->alpha; |
| 356 | |
| 357 | /* Set up some basic variables */ |
| 358 | dstbpp = dstfmt->BytesPerPixel; |
| 359 | srcskip += width-(width+7)/8; |
| 360 | |
| 361 | while ( height-- ) { |
| 362 | Uint8 byte = 0, bit; |
| 363 | for ( c=0; c<width; ++c ) { |
| 364 | if ( (c&7) == 0 ) { |
| 365 | byte = *src++; |
| 366 | } |
| 367 | bit = (byte&0x80)>>7; |
| 368 | if ( 1 ) { |
| 369 | Uint32 pixel; |
| 370 | unsigned sR, sG, sB; |
| 371 | unsigned dR, dG, dB; |
| 372 | sR = srcpal[bit].r; |
| 373 | sG = srcpal[bit].g; |
| 374 | sB = srcpal[bit].b; |
| 375 | DISEMBLE_RGB(dst, dstbpp, dstfmt, |
| 376 | pixel, dR, dG, dB); |
| 377 | ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
| 378 | ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
| 379 | } |
| 380 | byte <<= 1; |
| 381 | dst += dstbpp; |
| 382 | } |
| 383 | src += srcskip; |
| 384 | dst += dstskip; |
| 385 | } |
| 386 | } |
| 387 | |
| 388 | static void BlitBtoNAlphaKey(SDL_BlitInfo *info) |
| 389 | { |
| 390 | int width = info->d_width; |
| 391 | int height = info->d_height; |
| 392 | Uint8 *src = info->s_pixels; |
| 393 | Uint8 *dst = info->d_pixels; |
| 394 | int srcskip = info->s_skip; |
| 395 | int dstskip = info->d_skip; |
| 396 | SDL_PixelFormat *srcfmt = info->src; |
| 397 | SDL_PixelFormat *dstfmt = info->dst; |
| 398 | const SDL_Color *srcpal = srcfmt->palette->colors; |
| 399 | int dstbpp; |
| 400 | int c; |
| 401 | const int A = srcfmt->alpha; |
| 402 | Uint32 ckey = srcfmt->colorkey; |
| 403 | |
| 404 | /* Set up some basic variables */ |
| 405 | dstbpp = dstfmt->BytesPerPixel; |
| 406 | srcskip += width-(width+7)/8; |
| 407 | |
| 408 | while ( height-- ) { |
| 409 | Uint8 byte = 0, bit; |
| 410 | for ( c=0; c<width; ++c ) { |
| 411 | if ( (c&7) == 0 ) { |
| 412 | byte = *src++; |
| 413 | } |
| 414 | bit = (byte&0x80)>>7; |
| 415 | if ( bit != ckey ) { |
| 416 | int sR, sG, sB; |
| 417 | int dR, dG, dB; |
| 418 | Uint32 pixel; |
| 419 | sR = srcpal[bit].r; |
| 420 | sG = srcpal[bit].g; |
| 421 | sB = srcpal[bit].b; |
| 422 | DISEMBLE_RGB(dst, dstbpp, dstfmt, |
| 423 | pixel, dR, dG, dB); |
| 424 | ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); |
| 425 | ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); |
| 426 | } |
| 427 | byte <<= 1; |
| 428 | dst += dstbpp; |
| 429 | } |
| 430 | src += srcskip; |
| 431 | dst += dstskip; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | static SDL_loblit bitmap_blit[] = { |
| 436 | NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4 |
| 437 | }; |
| 438 | |
| 439 | static SDL_loblit colorkey_blit[] = { |
| 440 | NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key |
| 441 | }; |
| 442 | |
| 443 | SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index) |
| 444 | { |
| 445 | int which; |
| 446 | |
| 447 | if ( surface->format->BitsPerPixel != 1 ) { |
| 448 | /* We don't support sub 8-bit packed pixel modes */ |
| 449 | return NULL; |
| 450 | } |
| 451 | if ( surface->map->dst->format->BitsPerPixel < 8 ) { |
| 452 | which = 0; |
| 453 | } else { |
| 454 | which = surface->map->dst->format->BytesPerPixel; |
| 455 | } |
| 456 | switch(blit_index) { |
| 457 | case 0: /* copy */ |
| 458 | return bitmap_blit[which]; |
| 459 | |
| 460 | case 1: /* colorkey */ |
| 461 | return colorkey_blit[which]; |
| 462 | |
| 463 | case 2: /* alpha */ |
| 464 | return which >= 2 ? BlitBtoNAlpha : NULL; |
| 465 | |
| 466 | case 4: /* alpha + colorkey */ |
| 467 | return which >= 2 ? BlitBtoNAlphaKey : NULL; |
| 468 | } |
| 469 | return NULL; |
| 470 | } |
| 471 | |