Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_0.c @ 156:7064032cbe77
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| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 20 Aug 2001 00:10:35 +0000 |
| parents | e85e03f195b4 |
| children | e8157fcb3114 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
| 3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga | |
| 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 | |
| 20 slouken@devolution.com | |
| 21 */ | |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #include <stdio.h> | |
| 29 #include <string.h> | |
| 30 | |
| 31 #include "SDL_types.h" | |
| 32 #include "SDL_video.h" | |
| 33 #include "SDL_blit.h" | |
| 34 | |
| 35 /* Functions to blit from bitmaps to other surfaces */ | |
| 36 | |
| 37 static void BlitBto1(SDL_BlitInfo *info) | |
| 38 { | |
| 39 int c; | |
| 40 int width, height; | |
| 41 Uint8 *src, *map, *dst; | |
| 42 int srcskip, dstskip; | |
| 43 | |
| 44 /* Set up some basic variables */ | |
| 45 width = info->d_width; | |
| 46 height = info->d_height; | |
| 47 src = info->s_pixels; | |
| 48 srcskip = info->s_skip; | |
| 49 dst = info->d_pixels; | |
| 50 dstskip = info->d_skip; | |
| 51 map = info->table; | |
| 52 srcskip += width-(width+7)/8; | |
| 53 | |
| 54 if ( map ) { | |
| 55 while ( height-- ) { | |
| 56 Uint8 byte = 0, bit; | |
| 57 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
58 if ( (c&7) == 0 ) { |
| 0 | 59 byte = *src++; |
| 60 } | |
| 61 bit = (byte&0x80)>>7; | |
| 62 if ( 1 ) { | |
| 63 *dst = map[bit]; | |
| 64 } | |
| 65 dst++; | |
| 66 byte <<= 1; | |
| 67 } | |
| 68 src += srcskip; | |
| 69 dst += dstskip; | |
| 70 } | |
| 71 } else { | |
| 72 while ( height-- ) { | |
| 73 Uint8 byte = 0, bit; | |
| 74 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
75 if ( (c&7) == 0 ) { |
| 0 | 76 byte = *src++; |
| 77 } | |
| 78 bit = (byte&0x80)>>7; | |
| 79 if ( 1 ) { | |
| 80 *dst = bit; | |
| 81 } | |
| 82 dst++; | |
| 83 byte <<= 1; | |
| 84 } | |
| 85 src += srcskip; | |
| 86 dst += dstskip; | |
| 87 } | |
| 88 } | |
| 89 } | |
| 90 static void BlitBto2(SDL_BlitInfo *info) | |
| 91 { | |
| 92 int c; | |
| 93 int width, height; | |
| 94 Uint8 *src; | |
| 95 Uint16 *map, *dst; | |
| 96 int srcskip, dstskip; | |
| 97 | |
| 98 /* Set up some basic variables */ | |
| 99 width = info->d_width; | |
| 100 height = info->d_height; | |
| 101 src = info->s_pixels; | |
| 102 srcskip = info->s_skip; | |
| 103 dst = (Uint16 *)info->d_pixels; | |
| 104 dstskip = info->d_skip/2; | |
| 105 map = (Uint16 *)info->table; | |
| 106 srcskip += width-(width+7)/8; | |
| 107 | |
| 108 while ( height-- ) { | |
| 109 Uint8 byte = 0, bit; | |
| 110 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
111 if ( (c&7) == 0 ) { |
| 0 | 112 byte = *src++; |
| 113 } | |
| 114 bit = (byte&0x80)>>7; | |
| 115 if ( 1 ) { | |
| 116 *dst = map[bit]; | |
| 117 } | |
| 118 byte <<= 1; | |
| 119 dst++; | |
| 120 } | |
| 121 src += srcskip; | |
| 122 dst += dstskip; | |
| 123 } | |
| 124 } | |
| 125 static void BlitBto3(SDL_BlitInfo *info) | |
| 126 { | |
| 127 int c, o; | |
| 128 int width, height; | |
| 129 Uint8 *src, *map, *dst; | |
| 130 int srcskip, dstskip; | |
| 131 | |
| 132 /* Set up some basic variables */ | |
| 133 width = info->d_width; | |
| 134 height = info->d_height; | |
| 135 src = info->s_pixels; | |
| 136 srcskip = info->s_skip; | |
| 137 dst = info->d_pixels; | |
| 138 dstskip = info->d_skip; | |
| 139 map = info->table; | |
| 140 srcskip += width-(width+7)/8; | |
| 141 | |
| 142 while ( height-- ) { | |
| 143 Uint8 byte = 0, bit; | |
| 144 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
145 if ( (c&7) == 0 ) { |
| 0 | 146 byte = *src++; |
| 147 } | |
| 148 bit = (byte&0x80)>>7; | |
| 149 if ( 1 ) { | |
| 150 o = bit * 4; | |
| 151 dst[0] = map[o++]; | |
| 152 dst[1] = map[o++]; | |
| 153 dst[2] = map[o++]; | |
| 154 } | |
| 155 byte <<= 1; | |
| 156 dst += 3; | |
| 157 } | |
| 158 src += srcskip; | |
| 159 dst += dstskip; | |
| 160 } | |
| 161 } | |
| 162 static void BlitBto4(SDL_BlitInfo *info) | |
| 163 { | |
| 164 int width, height; | |
| 165 Uint8 *src; | |
| 166 Uint32 *map, *dst; | |
| 167 int srcskip, dstskip; | |
| 168 int c; | |
| 169 | |
| 170 /* Set up some basic variables */ | |
| 171 width = info->d_width; | |
| 172 height = info->d_height; | |
| 173 src = info->s_pixels; | |
| 174 srcskip = info->s_skip; | |
| 175 dst = (Uint32 *)info->d_pixels; | |
| 176 dstskip = info->d_skip/4; | |
| 177 map = (Uint32 *)info->table; | |
| 178 srcskip += width-(width+7)/8; | |
| 179 | |
| 180 while ( height-- ) { | |
| 181 Uint8 byte = 0, bit; | |
| 182 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
183 if ( (c&7) == 0 ) { |
| 0 | 184 byte = *src++; |
| 185 } | |
| 186 bit = (byte&0x80)>>7; | |
| 187 if ( 1 ) { | |
| 188 *dst = map[bit]; | |
| 189 } | |
| 190 byte <<= 1; | |
| 191 dst++; | |
| 192 } | |
| 193 src += srcskip; | |
| 194 dst += dstskip; | |
| 195 } | |
| 196 } | |
| 197 | |
| 198 static void BlitBto1Key(SDL_BlitInfo *info) | |
| 199 { | |
| 200 int width = info->d_width; | |
| 201 int height = info->d_height; | |
| 202 Uint8 *src = info->s_pixels; | |
| 203 Uint8 *dst = info->d_pixels; | |
| 204 int srcskip = info->s_skip; | |
| 205 int dstskip = info->d_skip; | |
| 206 Uint32 ckey = info->src->colorkey; | |
| 207 Uint8 *palmap = info->table; | |
| 208 int c; | |
| 209 | |
| 210 /* Set up some basic variables */ | |
| 211 srcskip += width-(width+7)/8; | |
| 212 | |
| 213 if ( palmap ) { | |
| 214 while ( height-- ) { | |
| 215 Uint8 byte = 0, bit; | |
| 216 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
217 if ( (c&7) == 0 ) { |
| 0 | 218 byte = *src++; |
| 219 } | |
| 220 bit = (byte&0x80)>>7; | |
| 221 if ( bit != ckey ) { | |
| 222 *dst = palmap[bit]; | |
| 223 } | |
| 224 dst++; | |
| 225 byte <<= 1; | |
| 226 } | |
| 227 src += srcskip; | |
| 228 dst += dstskip; | |
| 229 } | |
| 230 } else { | |
| 231 while ( height-- ) { | |
| 232 Uint8 byte = 0, bit; | |
| 233 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
234 if ( (c&7) == 0 ) { |
| 0 | 235 byte = *src++; |
| 236 } | |
| 237 bit = (byte&0x80)>>7; | |
| 238 if ( bit != ckey ) { | |
| 239 *dst = bit; | |
| 240 } | |
| 241 dst++; | |
| 242 byte <<= 1; | |
| 243 } | |
| 244 src += srcskip; | |
| 245 dst += dstskip; | |
| 246 } | |
| 247 } | |
| 248 } | |
| 249 | |
| 250 static void BlitBto2Key(SDL_BlitInfo *info) | |
| 251 { | |
| 252 int width = info->d_width; | |
| 253 int height = info->d_height; | |
| 254 Uint8 *src = info->s_pixels; | |
| 255 Uint16 *dstp = (Uint16 *)info->d_pixels; | |
| 256 int srcskip = info->s_skip; | |
| 257 int dstskip = info->d_skip; | |
| 258 Uint32 ckey = info->src->colorkey; | |
| 259 Uint8 *palmap = info->table; | |
| 260 int c; | |
| 261 | |
| 262 /* Set up some basic variables */ | |
| 263 srcskip += width-(width+7)/8; | |
| 264 dstskip /= 2; | |
| 265 | |
| 266 while ( height-- ) { | |
| 267 Uint8 byte = 0, bit; | |
| 268 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
269 if ( (c&7) == 0 ) { |
| 0 | 270 byte = *src++; |
| 271 } | |
| 272 bit = (byte&0x80)>>7; | |
| 273 if ( bit != ckey ) { | |
| 274 *dstp=((Uint16 *)palmap)[bit]; | |
| 275 } | |
| 276 byte <<= 1; | |
| 277 dstp++; | |
| 278 } | |
| 279 src += srcskip; | |
| 280 dstp += dstskip; | |
| 281 } | |
| 282 } | |
| 283 | |
| 284 static void BlitBto3Key(SDL_BlitInfo *info) | |
| 285 { | |
| 286 int width = info->d_width; | |
| 287 int height = info->d_height; | |
| 288 Uint8 *src = info->s_pixels; | |
| 289 Uint8 *dst = info->d_pixels; | |
| 290 int srcskip = info->s_skip; | |
| 291 int dstskip = info->d_skip; | |
| 292 Uint32 ckey = info->src->colorkey; | |
| 293 Uint8 *palmap = info->table; | |
| 294 int c; | |
| 295 | |
| 296 /* Set up some basic variables */ | |
| 297 srcskip += width-(width+7)/8; | |
| 298 | |
| 299 while ( height-- ) { | |
| 300 Uint8 byte = 0, bit; | |
| 301 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
302 if ( (c&7) == 0 ) { |
| 0 | 303 byte = *src++; |
| 304 } | |
| 305 bit = (byte&0x80)>>7; | |
| 306 if ( bit != ckey ) { | |
| 307 memcpy(dst, &palmap[bit*4], 3); | |
| 308 } | |
| 309 byte <<= 1; | |
| 310 dst += 3; | |
| 311 } | |
| 312 src += srcskip; | |
| 313 dst += dstskip; | |
| 314 } | |
| 315 } | |
| 316 | |
| 317 static void BlitBto4Key(SDL_BlitInfo *info) | |
| 318 { | |
| 319 int width = info->d_width; | |
| 320 int height = info->d_height; | |
| 321 Uint8 *src = info->s_pixels; | |
| 322 Uint32 *dstp = (Uint32 *)info->d_pixels; | |
| 323 int srcskip = info->s_skip; | |
| 324 int dstskip = info->d_skip; | |
| 325 Uint32 ckey = info->src->colorkey; | |
| 326 Uint8 *palmap = info->table; | |
| 327 int c; | |
| 328 | |
| 329 /* Set up some basic variables */ | |
| 330 srcskip += width-(width+7)/8; | |
| 331 dstskip /= 4; | |
| 332 | |
| 333 while ( height-- ) { | |
| 334 Uint8 byte = 0, bit; | |
| 335 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
336 if ( (c&7) == 0 ) { |
| 0 | 337 byte = *src++; |
| 338 } | |
| 339 bit = (byte&0x80)>>7; | |
| 340 if ( bit != ckey ) { | |
| 341 *dstp=((Uint32 *)palmap)[bit]; | |
| 342 } | |
| 343 byte <<= 1; | |
| 344 dstp++; | |
| 345 } | |
| 346 src += srcskip; | |
| 347 dstp += dstskip; | |
| 348 } | |
| 349 } | |
| 350 | |
| 351 static void BlitBtoNAlpha(SDL_BlitInfo *info) | |
| 352 { | |
| 353 int width = info->d_width; | |
| 354 int height = info->d_height; | |
| 355 Uint8 *src = info->s_pixels; | |
| 356 Uint8 *dst = info->d_pixels; | |
| 357 int srcskip = info->s_skip; | |
| 358 int dstskip = info->d_skip; | |
| 359 const SDL_Color *srcpal = info->src->palette->colors; | |
| 360 SDL_PixelFormat *dstfmt = info->dst; | |
| 361 int dstbpp; | |
| 362 int c; | |
| 363 const int A = info->src->alpha; | |
| 364 | |
| 365 /* Set up some basic variables */ | |
| 366 dstbpp = dstfmt->BytesPerPixel; | |
| 367 srcskip += width-(width+7)/8; | |
| 368 | |
| 369 while ( height-- ) { | |
| 370 Uint8 byte = 0, bit; | |
| 371 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
372 if ( (c&7) == 0 ) { |
| 0 | 373 byte = *src++; |
| 374 } | |
| 375 bit = (byte&0x80)>>7; | |
| 376 if ( 1 ) { | |
| 377 Uint32 pixel; | |
| 378 unsigned sR, sG, sB; | |
| 379 unsigned dR, dG, dB; | |
| 380 sR = srcpal[bit].r; | |
| 381 sG = srcpal[bit].g; | |
| 382 sB = srcpal[bit].b; | |
| 383 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 384 pixel, dR, dG, dB); | |
| 385 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 386 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 387 } | |
| 388 byte <<= 1; | |
| 389 dst += dstbpp; | |
| 390 } | |
| 391 src += srcskip; | |
| 392 dst += dstskip; | |
| 393 } | |
| 394 } | |
| 395 | |
| 396 static void BlitBtoNAlphaKey(SDL_BlitInfo *info) | |
| 397 { | |
| 398 int width = info->d_width; | |
| 399 int height = info->d_height; | |
| 400 Uint8 *src = info->s_pixels; | |
| 401 Uint8 *dst = info->d_pixels; | |
| 402 int srcskip = info->s_skip; | |
| 403 int dstskip = info->d_skip; | |
| 404 SDL_PixelFormat *srcfmt = info->src; | |
| 405 SDL_PixelFormat *dstfmt = info->dst; | |
| 406 const SDL_Color *srcpal = srcfmt->palette->colors; | |
| 407 int dstbpp; | |
| 408 int c; | |
| 409 const int A = srcfmt->alpha; | |
| 410 Uint32 ckey = srcfmt->colorkey; | |
| 411 | |
| 412 /* Set up some basic variables */ | |
| 413 dstbpp = dstfmt->BytesPerPixel; | |
| 414 srcskip += width-(width+7)/8; | |
| 415 | |
| 416 while ( height-- ) { | |
| 417 Uint8 byte = 0, bit; | |
| 418 for ( c=0; c<width; ++c ) { | |
|
91
e85e03f195b4
From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
419 if ( (c&7) == 0 ) { |
| 0 | 420 byte = *src++; |
| 421 } | |
| 422 bit = (byte&0x80)>>7; | |
| 423 if ( bit != ckey ) { | |
| 424 int sR, sG, sB; | |
| 425 int dR, dG, dB; | |
| 426 Uint32 pixel; | |
| 427 sR = srcpal[bit].r; | |
| 428 sG = srcpal[bit].g; | |
| 429 sB = srcpal[bit].b; | |
| 430 DISEMBLE_RGB(dst, dstbpp, dstfmt, | |
| 431 pixel, dR, dG, dB); | |
| 432 ALPHA_BLEND(sR, sG, sB, A, dR, dG, dB); | |
| 433 ASSEMBLE_RGB(dst, dstbpp, dstfmt, dR, dG, dB); | |
| 434 } | |
| 435 byte <<= 1; | |
| 436 dst += dstbpp; | |
| 437 } | |
| 438 src += srcskip; | |
| 439 dst += dstskip; | |
| 440 } | |
| 441 } | |
| 442 | |
| 443 static SDL_loblit bitmap_blit[] = { | |
| 444 NULL, BlitBto1, BlitBto2, BlitBto3, BlitBto4 | |
| 445 }; | |
| 446 | |
| 447 static SDL_loblit colorkey_blit[] = { | |
| 448 NULL, BlitBto1Key, BlitBto2Key, BlitBto3Key, BlitBto4Key | |
| 449 }; | |
| 450 | |
| 451 SDL_loblit SDL_CalculateBlit0(SDL_Surface *surface, int blit_index) | |
| 452 { | |
| 453 int which; | |
| 454 | |
| 455 if ( surface->map->dst->format->BitsPerPixel < 8 ) { | |
| 456 which = 0; | |
| 457 } else { | |
| 458 which = surface->map->dst->format->BytesPerPixel; | |
| 459 } | |
| 460 switch(blit_index) { | |
| 461 case 0: /* copy */ | |
| 462 return bitmap_blit[which]; | |
| 463 | |
| 464 case 1: /* colorkey */ | |
| 465 return colorkey_blit[which]; | |
| 466 | |
| 467 case 2: /* alpha */ | |
| 468 return which >= 2 ? BlitBtoNAlpha : NULL; | |
| 469 | |
| 470 case 4: /* alpha + colorkey */ | |
| 471 return which >= 2 ? BlitBtoNAlphaKey : NULL; | |
| 472 } | |
| 473 return NULL; | |
| 474 } | |
| 475 |