Mercurial > sdl-ios-xcode
annotate src/video/SDL_blit_0.c @ 1057:e9d23bb80140
Date: Mon, 02 May 2005 04:23:16 -0500
From: Jonathan Atkins
Subject: Re: [PATCH] *CRITICAL* 8bit direct RGB palette not being created
I think that SDL_AllocFormat should create the palette for all 8bit
surfaces. And when the RGBAmasks match the normal 3:3:2:0 we need to
apply the old behavior. If the mask doesn't match that, then we need
to make the right palette assuming the masks are valid (I don't think
we validate any masks for high color surfaces...so we wouldn't here)
Then there's always a palette available for the 8bit surfaces.
This restores the normal behavior and allows for masks to create
palettes automatically for odd masks even, which would be a neato
thing to have in there, as SDL never did this before.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Mon, 16 May 2005 05:34:58 +0000 |
| parents | b8d311d90021 |
| children | e6c91fd1911e |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 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
Sam Lantinga <slouken@libsdl.org>
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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 #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 ) { | |
|
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
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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 ) { | |
|
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
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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 ) { | |
|
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Sam Lantinga <slouken@lokigames.com>
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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 ) { | |
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
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diff
changeset
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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
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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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
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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
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From: "Markus F.X.J. Oberhumer"
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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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 ) { | |
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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
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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 | |
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Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents:
769
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changeset
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455 if ( surface->format->BitsPerPixel > 1 ) { |
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e9d23bb80140
Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents:
769
diff
changeset
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456 /* We don't support sub 8-bit packed pixel modes */ |
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e9d23bb80140
Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents:
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457 return NULL; |
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e9d23bb80140
Date: Mon, 02 May 2005 04:23:16 -0500
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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458 } |
| 0 | 459 if ( surface->map->dst->format->BitsPerPixel < 8 ) { |
| 460 which = 0; | |
| 461 } else { | |
| 462 which = surface->map->dst->format->BytesPerPixel; | |
| 463 } | |
| 464 switch(blit_index) { | |
| 465 case 0: /* copy */ | |
| 466 return bitmap_blit[which]; | |
| 467 | |
| 468 case 1: /* colorkey */ | |
| 469 return colorkey_blit[which]; | |
| 470 | |
| 471 case 2: /* alpha */ | |
| 472 return which >= 2 ? BlitBtoNAlpha : NULL; | |
| 473 | |
| 474 case 4: /* alpha + colorkey */ | |
| 475 return which >= 2 ? BlitBtoNAlphaKey : NULL; | |
| 476 } | |
| 477 return NULL; | |
| 478 } | |
| 479 |