Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_0.c @ 1604:bfba1ea4452a
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 23 Mar 2006 21:39:02 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 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 | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 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 ) { | |
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50 if ( (c&7) == 0 ) { |
| 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 ) { | |
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Sam Lantinga <slouken@lokigames.com>
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67 if ( (c&7) == 0 ) { |
| 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 ) { | |
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Sam Lantinga <slouken@lokigames.com>
parents:
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changeset
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103 if ( (c&7) == 0 ) { |
| 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 ) { | |
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Sam Lantinga <slouken@lokigames.com>
parents:
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changeset
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137 if ( (c&7) == 0 ) { |
| 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 ) { | |
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Sam Lantinga <slouken@lokigames.com>
parents:
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diff
changeset
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175 if ( (c&7) == 0 ) { |
| 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 ) { | |
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changeset
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209 if ( (c&7) == 0 ) { |
| 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 ) { | |
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Sam Lantinga <slouken@lokigames.com>
parents:
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changeset
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226 if ( (c&7) == 0 ) { |
| 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 ) { | |
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From: "Markus F.X.J. Oberhumer"
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parents:
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diff
changeset
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261 if ( (c&7) == 0 ) { |
| 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 ) { | |
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294 if ( (c&7) == 0 ) { |
| 0 | 295 byte = *src++; |
| 296 } | |
| 297 bit = (byte&0x80)>>7; | |
| 298 if ( bit != ckey ) { | |
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299 SDL_memcpy(dst, &palmap[bit*4], 3); |
| 0 | 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 ) { | |
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parents:
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changeset
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328 if ( (c&7) == 0 ) { |
| 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 ) { | |
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Sam Lantinga <slouken@lokigames.com>
parents:
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diff
changeset
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364 if ( (c&7) == 0 ) { |
| 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 ) { | |
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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411 if ( (c&7) == 0 ) { |
| 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 | |
| 1058 | 447 if ( surface->format->BitsPerPixel != 1 ) { |
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448 /* We don't support sub 8-bit packed pixel modes */ |
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449 return NULL; |
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Date: Mon, 02 May 2005 04:23:16 -0500
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450 } |
| 0 | 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 |