| 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_sysvideo.h" |
| 26 | #include "SDL_cursor_c.h" |
| 27 | #include "SDL_blit.h" |
| 28 | #include "SDL_RLEaccel_c.h" |
| 29 | #include "SDL_pixels_c.h" |
| 30 | #include "SDL_leaks.h" |
| 31 | |
| 32 | |
| 33 | /* Public routines */ |
| 34 | /* |
| 35 | * Create an empty RGB surface of the appropriate depth |
| 36 | */ |
| 37 | SDL_Surface * SDL_CreateRGBSurface (Uint32 flags, |
| 38 | int width, int height, int depth, |
| 39 | Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) |
| 40 | { |
| 41 | SDL_VideoDevice *video = current_video; |
| 42 | SDL_VideoDevice *this = current_video; |
| 43 | SDL_Surface *screen; |
| 44 | SDL_Surface *surface; |
| 45 | |
| 46 | /* Make sure the size requested doesn't overflow our datatypes */ |
| 47 | /* Next time I write a library like SDL, I'll use int for size. :) */ |
| 48 | if ( width >= 16384 || height >= 65536 ) { |
| 49 | SDL_SetError("Width or height is too large"); |
| 50 | return(NULL); |
| 51 | } |
| 52 | |
| 53 | /* Check to see if we desire the surface in video memory */ |
| 54 | if ( video ) { |
| 55 | screen = SDL_PublicSurface; |
| 56 | } else { |
| 57 | screen = NULL; |
| 58 | } |
| 59 | if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) { |
| 60 | if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) { |
| 61 | flags |= SDL_HWSURFACE; |
| 62 | } |
| 63 | if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { |
| 64 | if ( ! current_video->info.blit_hw_CC ) { |
| 65 | flags &= ~SDL_HWSURFACE; |
| 66 | } |
| 67 | } |
| 68 | if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
| 69 | if ( ! current_video->info.blit_hw_A ) { |
| 70 | flags &= ~SDL_HWSURFACE; |
| 71 | } |
| 72 | } |
| 73 | } else { |
| 74 | flags &= ~SDL_HWSURFACE; |
| 75 | } |
| 76 | |
| 77 | /* Allocate the surface */ |
| 78 | surface = (SDL_Surface *)SDL_malloc(sizeof(*surface)); |
| 79 | if ( surface == NULL ) { |
| 80 | SDL_OutOfMemory(); |
| 81 | return(NULL); |
| 82 | } |
| 83 | surface->flags = SDL_SWSURFACE; |
| 84 | if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { |
| 85 | if ((Amask) && (video->displayformatalphapixel)) |
| 86 | { |
| 87 | depth = video->displayformatalphapixel->BitsPerPixel; |
| 88 | Rmask = video->displayformatalphapixel->Rmask; |
| 89 | Gmask = video->displayformatalphapixel->Gmask; |
| 90 | Bmask = video->displayformatalphapixel->Bmask; |
| 91 | Amask = video->displayformatalphapixel->Amask; |
| 92 | } |
| 93 | else |
| 94 | { |
| 95 | depth = screen->format->BitsPerPixel; |
| 96 | Rmask = screen->format->Rmask; |
| 97 | Gmask = screen->format->Gmask; |
| 98 | Bmask = screen->format->Bmask; |
| 99 | Amask = screen->format->Amask; |
| 100 | } |
| 101 | } |
| 102 | surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask); |
| 103 | if ( surface->format == NULL ) { |
| 104 | SDL_free(surface); |
| 105 | return(NULL); |
| 106 | } |
| 107 | if ( Amask ) { |
| 108 | surface->flags |= SDL_SRCALPHA; |
| 109 | } |
| 110 | surface->w = width; |
| 111 | surface->h = height; |
| 112 | surface->pitch = SDL_CalculatePitch(surface); |
| 113 | surface->pixels = NULL; |
| 114 | surface->offset = 0; |
| 115 | surface->hwdata = NULL; |
| 116 | surface->locked = 0; |
| 117 | surface->map = NULL; |
| 118 | surface->unused1 = 0; |
| 119 | SDL_SetClipRect(surface, NULL); |
| 120 | SDL_FormatChanged(surface); |
| 121 | |
| 122 | /* Get the pixels */ |
| 123 | if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) || |
| 124 | (video->AllocHWSurface(this, surface) < 0) ) { |
| 125 | if ( surface->w && surface->h ) { |
| 126 | surface->pixels = SDL_malloc(surface->h*surface->pitch); |
| 127 | if ( surface->pixels == NULL ) { |
| 128 | SDL_FreeSurface(surface); |
| 129 | SDL_OutOfMemory(); |
| 130 | return(NULL); |
| 131 | } |
| 132 | /* This is important for bitmaps */ |
| 133 | SDL_memset(surface->pixels, 0, surface->h*surface->pitch); |
| 134 | } |
| 135 | } |
| 136 | |
| 137 | /* Allocate an empty mapping */ |
| 138 | surface->map = SDL_AllocBlitMap(); |
| 139 | if ( surface->map == NULL ) { |
| 140 | SDL_FreeSurface(surface); |
| 141 | return(NULL); |
| 142 | } |
| 143 | |
| 144 | /* The surface is ready to go */ |
| 145 | surface->refcount = 1; |
| 146 | #ifdef CHECK_LEAKS |
| 147 | ++surfaces_allocated; |
| 148 | #endif |
| 149 | return(surface); |
| 150 | } |
| 151 | /* |
| 152 | * Create an RGB surface from an existing memory buffer |
| 153 | */ |
| 154 | SDL_Surface * SDL_CreateRGBSurfaceFrom (void *pixels, |
| 155 | int width, int height, int depth, int pitch, |
| 156 | Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) |
| 157 | { |
| 158 | SDL_Surface *surface; |
| 159 | |
| 160 | surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, depth, |
| 161 | Rmask, Gmask, Bmask, Amask); |
| 162 | if ( surface != NULL ) { |
| 163 | surface->flags |= SDL_PREALLOC; |
| 164 | surface->pixels = pixels; |
| 165 | surface->w = width; |
| 166 | surface->h = height; |
| 167 | surface->pitch = pitch; |
| 168 | SDL_SetClipRect(surface, NULL); |
| 169 | } |
| 170 | return(surface); |
| 171 | } |
| 172 | /* |
| 173 | * Set the color key in a blittable surface |
| 174 | */ |
| 175 | int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key) |
| 176 | { |
| 177 | /* Sanity check the flag as it gets passed in */ |
| 178 | if ( flag & SDL_SRCCOLORKEY ) { |
| 179 | if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { |
| 180 | flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK); |
| 181 | } else { |
| 182 | flag = SDL_SRCCOLORKEY; |
| 183 | } |
| 184 | } else { |
| 185 | flag = 0; |
| 186 | } |
| 187 | |
| 188 | /* Optimize away operations that don't change anything */ |
| 189 | if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) && |
| 190 | (key == surface->format->colorkey) ) { |
| 191 | return(0); |
| 192 | } |
| 193 | |
| 194 | /* UnRLE surfaces before we change the colorkey */ |
| 195 | if ( surface->flags & SDL_RLEACCEL ) { |
| 196 | SDL_UnRLESurface(surface, 1); |
| 197 | } |
| 198 | |
| 199 | if ( flag ) { |
| 200 | SDL_VideoDevice *video = current_video; |
| 201 | SDL_VideoDevice *this = current_video; |
| 202 | |
| 203 | |
| 204 | surface->flags |= SDL_SRCCOLORKEY; |
| 205 | surface->format->colorkey = key; |
| 206 | if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
| 207 | if ( (video->SetHWColorKey == NULL) || |
| 208 | (video->SetHWColorKey(this, surface, key) < 0) ) { |
| 209 | surface->flags &= ~SDL_HWACCEL; |
| 210 | } |
| 211 | } |
| 212 | if ( flag & SDL_RLEACCELOK ) { |
| 213 | surface->flags |= SDL_RLEACCELOK; |
| 214 | } else { |
| 215 | surface->flags &= ~SDL_RLEACCELOK; |
| 216 | } |
| 217 | } else { |
| 218 | surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK); |
| 219 | surface->format->colorkey = 0; |
| 220 | } |
| 221 | SDL_InvalidateMap(surface->map); |
| 222 | return(0); |
| 223 | } |
| 224 | /* This function sets the alpha channel of a surface */ |
| 225 | int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value) |
| 226 | { |
| 227 | Uint32 oldflags = surface->flags; |
| 228 | Uint32 oldalpha = surface->format->alpha; |
| 229 | |
| 230 | /* Sanity check the flag as it gets passed in */ |
| 231 | if ( flag & SDL_SRCALPHA ) { |
| 232 | if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { |
| 233 | flag = (SDL_SRCALPHA | SDL_RLEACCELOK); |
| 234 | } else { |
| 235 | flag = SDL_SRCALPHA; |
| 236 | } |
| 237 | } else { |
| 238 | flag = 0; |
| 239 | } |
| 240 | |
| 241 | /* Optimize away operations that don't change anything */ |
| 242 | if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) && |
| 243 | (!flag || value == oldalpha) ) { |
| 244 | return(0); |
| 245 | } |
| 246 | |
| 247 | if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL)) |
| 248 | SDL_UnRLESurface(surface, 1); |
| 249 | |
| 250 | if ( flag ) { |
| 251 | SDL_VideoDevice *video = current_video; |
| 252 | SDL_VideoDevice *this = current_video; |
| 253 | |
| 254 | surface->flags |= SDL_SRCALPHA; |
| 255 | surface->format->alpha = value; |
| 256 | if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
| 257 | if ( (video->SetHWAlpha == NULL) || |
| 258 | (video->SetHWAlpha(this, surface, value) < 0) ) { |
| 259 | surface->flags &= ~SDL_HWACCEL; |
| 260 | } |
| 261 | } |
| 262 | if ( flag & SDL_RLEACCELOK ) { |
| 263 | surface->flags |= SDL_RLEACCELOK; |
| 264 | } else { |
| 265 | surface->flags &= ~SDL_RLEACCELOK; |
| 266 | } |
| 267 | } else { |
| 268 | surface->flags &= ~SDL_SRCALPHA; |
| 269 | surface->format->alpha = SDL_ALPHA_OPAQUE; |
| 270 | } |
| 271 | /* |
| 272 | * The representation for software surfaces is independent of |
| 273 | * per-surface alpha, so no need to invalidate the blit mapping |
| 274 | * if just the alpha value was changed. (If either is 255, we still |
| 275 | * need to invalidate.) |
| 276 | */ |
| 277 | if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL |
| 278 | || oldflags != surface->flags |
| 279 | || (((oldalpha + 1) ^ (value + 1)) & 0x100)) |
| 280 | SDL_InvalidateMap(surface->map); |
| 281 | return(0); |
| 282 | } |
| 283 | int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value) |
| 284 | { |
| 285 | int row, col; |
| 286 | int offset; |
| 287 | Uint8 *buf; |
| 288 | |
| 289 | if ( (surface->format->Amask != 0xFF000000) && |
| 290 | (surface->format->Amask != 0x000000FF) ) { |
| 291 | SDL_SetError("Unsupported surface alpha mask format"); |
| 292 | return -1; |
| 293 | } |
| 294 | |
| 295 | #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
| 296 | if ( surface->format->Amask == 0xFF000000 ) { |
| 297 | offset = 3; |
| 298 | } else { |
| 299 | offset = 0; |
| 300 | } |
| 301 | #else |
| 302 | if ( surface->format->Amask == 0xFF000000 ) { |
| 303 | offset = 0; |
| 304 | } else { |
| 305 | offset = 3; |
| 306 | } |
| 307 | #endif /* Byte ordering */ |
| 308 | |
| 309 | /* Quickly set the alpha channel of an RGBA or ARGB surface */ |
| 310 | if ( SDL_MUSTLOCK(surface) ) { |
| 311 | if ( SDL_LockSurface(surface) < 0 ) { |
| 312 | return -1; |
| 313 | } |
| 314 | } |
| 315 | row = surface->h; |
| 316 | while (row--) { |
| 317 | col = surface->w; |
| 318 | buf = (Uint8 *)surface->pixels + row * surface->pitch + offset; |
| 319 | while(col--) { |
| 320 | *buf = value; |
| 321 | buf += 4; |
| 322 | } |
| 323 | } |
| 324 | if ( SDL_MUSTLOCK(surface) ) { |
| 325 | SDL_UnlockSurface(surface); |
| 326 | } |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * A function to calculate the intersection of two rectangles: |
| 332 | * return true if the rectangles intersect, false otherwise |
| 333 | */ |
| 334 | static __inline__ |
| 335 | SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection) |
| 336 | { |
| 337 | int Amin, Amax, Bmin, Bmax; |
| 338 | |
| 339 | /* Horizontal intersection */ |
| 340 | Amin = A->x; |
| 341 | Amax = Amin + A->w; |
| 342 | Bmin = B->x; |
| 343 | Bmax = Bmin + B->w; |
| 344 | if(Bmin > Amin) |
| 345 | Amin = Bmin; |
| 346 | intersection->x = Amin; |
| 347 | if(Bmax < Amax) |
| 348 | Amax = Bmax; |
| 349 | intersection->w = Amax - Amin > 0 ? Amax - Amin : 0; |
| 350 | |
| 351 | /* Vertical intersection */ |
| 352 | Amin = A->y; |
| 353 | Amax = Amin + A->h; |
| 354 | Bmin = B->y; |
| 355 | Bmax = Bmin + B->h; |
| 356 | if(Bmin > Amin) |
| 357 | Amin = Bmin; |
| 358 | intersection->y = Amin; |
| 359 | if(Bmax < Amax) |
| 360 | Amax = Bmax; |
| 361 | intersection->h = Amax - Amin > 0 ? Amax - Amin : 0; |
| 362 | |
| 363 | return (intersection->w && intersection->h); |
| 364 | } |
| 365 | /* |
| 366 | * Set the clipping rectangle for a blittable surface |
| 367 | */ |
| 368 | SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect) |
| 369 | { |
| 370 | SDL_Rect full_rect; |
| 371 | |
| 372 | /* Don't do anything if there's no surface to act on */ |
| 373 | if ( ! surface ) { |
| 374 | return SDL_FALSE; |
| 375 | } |
| 376 | |
| 377 | /* Set up the full surface rectangle */ |
| 378 | full_rect.x = 0; |
| 379 | full_rect.y = 0; |
| 380 | full_rect.w = surface->w; |
| 381 | full_rect.h = surface->h; |
| 382 | |
| 383 | /* Set the clipping rectangle */ |
| 384 | if ( ! rect ) { |
| 385 | surface->clip_rect = full_rect; |
| 386 | return 1; |
| 387 | } |
| 388 | return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect); |
| 389 | } |
| 390 | void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect) |
| 391 | { |
| 392 | if ( surface && rect ) { |
| 393 | *rect = surface->clip_rect; |
| 394 | } |
| 395 | } |
| 396 | /* |
| 397 | * Set up a blit between two surfaces -- split into three parts: |
| 398 | * The upper part, SDL_UpperBlit(), performs clipping and rectangle |
| 399 | * verification. The lower part is a pointer to a low level |
| 400 | * accelerated blitting function. |
| 401 | * |
| 402 | * These parts are separated out and each used internally by this |
| 403 | * library in the optimimum places. They are exported so that if |
| 404 | * you know exactly what you are doing, you can optimize your code |
| 405 | * by calling the one(s) you need. |
| 406 | */ |
| 407 | int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect, |
| 408 | SDL_Surface *dst, SDL_Rect *dstrect) |
| 409 | { |
| 410 | SDL_blit do_blit; |
| 411 | SDL_Rect hw_srcrect; |
| 412 | SDL_Rect hw_dstrect; |
| 413 | |
| 414 | /* Check to make sure the blit mapping is valid */ |
| 415 | if ( (src->map->dst != dst) || |
| 416 | (src->map->dst->format_version != src->map->format_version) ) { |
| 417 | if ( SDL_MapSurface(src, dst) < 0 ) { |
| 418 | return(-1); |
| 419 | } |
| 420 | } |
| 421 | |
| 422 | /* Figure out which blitter to use */ |
| 423 | if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) { |
| 424 | if ( src == SDL_VideoSurface ) { |
| 425 | hw_srcrect = *srcrect; |
| 426 | hw_srcrect.x += current_video->offset_x; |
| 427 | hw_srcrect.y += current_video->offset_y; |
| 428 | srcrect = &hw_srcrect; |
| 429 | } |
| 430 | if ( dst == SDL_VideoSurface ) { |
| 431 | hw_dstrect = *dstrect; |
| 432 | hw_dstrect.x += current_video->offset_x; |
| 433 | hw_dstrect.y += current_video->offset_y; |
| 434 | dstrect = &hw_dstrect; |
| 435 | } |
| 436 | do_blit = src->map->hw_blit; |
| 437 | } else { |
| 438 | do_blit = src->map->sw_blit; |
| 439 | } |
| 440 | return(do_blit(src, srcrect, dst, dstrect)); |
| 441 | } |
| 442 | |
| 443 | |
| 444 | int SDL_UpperBlit (SDL_Surface *src, SDL_Rect *srcrect, |
| 445 | SDL_Surface *dst, SDL_Rect *dstrect) |
| 446 | { |
| 447 | SDL_Rect fulldst; |
| 448 | int srcx, srcy, w, h; |
| 449 | |
| 450 | /* Make sure the surfaces aren't locked */ |
| 451 | if ( ! src || ! dst ) { |
| 452 | SDL_SetError("SDL_UpperBlit: passed a NULL surface"); |
| 453 | return(-1); |
| 454 | } |
| 455 | if ( src->locked || dst->locked ) { |
| 456 | SDL_SetError("Surfaces must not be locked during blit"); |
| 457 | return(-1); |
| 458 | } |
| 459 | |
| 460 | /* If the destination rectangle is NULL, use the entire dest surface */ |
| 461 | if ( dstrect == NULL ) { |
| 462 | fulldst.x = fulldst.y = 0; |
| 463 | dstrect = &fulldst; |
| 464 | } |
| 465 | |
| 466 | /* clip the source rectangle to the source surface */ |
| 467 | if(srcrect) { |
| 468 | int maxw, maxh; |
| 469 | |
| 470 | srcx = srcrect->x; |
| 471 | w = srcrect->w; |
| 472 | if(srcx < 0) { |
| 473 | w += srcx; |
| 474 | dstrect->x -= srcx; |
| 475 | srcx = 0; |
| 476 | } |
| 477 | maxw = src->w - srcx; |
| 478 | if(maxw < w) |
| 479 | w = maxw; |
| 480 | |
| 481 | srcy = srcrect->y; |
| 482 | h = srcrect->h; |
| 483 | if(srcy < 0) { |
| 484 | h += srcy; |
| 485 | dstrect->y -= srcy; |
| 486 | srcy = 0; |
| 487 | } |
| 488 | maxh = src->h - srcy; |
| 489 | if(maxh < h) |
| 490 | h = maxh; |
| 491 | |
| 492 | } else { |
| 493 | srcx = srcy = 0; |
| 494 | w = src->w; |
| 495 | h = src->h; |
| 496 | } |
| 497 | |
| 498 | /* clip the destination rectangle against the clip rectangle */ |
| 499 | { |
| 500 | SDL_Rect *clip = &dst->clip_rect; |
| 501 | int dx, dy; |
| 502 | |
| 503 | dx = clip->x - dstrect->x; |
| 504 | if(dx > 0) { |
| 505 | w -= dx; |
| 506 | dstrect->x += dx; |
| 507 | srcx += dx; |
| 508 | } |
| 509 | dx = dstrect->x + w - clip->x - clip->w; |
| 510 | if(dx > 0) |
| 511 | w -= dx; |
| 512 | |
| 513 | dy = clip->y - dstrect->y; |
| 514 | if(dy > 0) { |
| 515 | h -= dy; |
| 516 | dstrect->y += dy; |
| 517 | srcy += dy; |
| 518 | } |
| 519 | dy = dstrect->y + h - clip->y - clip->h; |
| 520 | if(dy > 0) |
| 521 | h -= dy; |
| 522 | } |
| 523 | |
| 524 | if(w > 0 && h > 0) { |
| 525 | SDL_Rect sr; |
| 526 | sr.x = srcx; |
| 527 | sr.y = srcy; |
| 528 | sr.w = dstrect->w = w; |
| 529 | sr.h = dstrect->h = h; |
| 530 | return SDL_LowerBlit(src, &sr, dst, dstrect); |
| 531 | } |
| 532 | dstrect->w = dstrect->h = 0; |
| 533 | return 0; |
| 534 | } |
| 535 | |
| 536 | static int SDL_FillRect1(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
| 537 | { |
| 538 | /* FIXME: We have to worry about packing order.. *sigh* */ |
| 539 | SDL_SetError("1-bpp rect fill not yet implemented"); |
| 540 | return -1; |
| 541 | } |
| 542 | |
| 543 | static int SDL_FillRect4(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
| 544 | { |
| 545 | /* FIXME: We have to worry about packing order.. *sigh* */ |
| 546 | SDL_SetError("4-bpp rect fill not yet implemented"); |
| 547 | return -1; |
| 548 | } |
| 549 | |
| 550 | /* |
| 551 | * This function performs a fast fill of the given rectangle with 'color' |
| 552 | */ |
| 553 | int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
| 554 | { |
| 555 | SDL_VideoDevice *video = current_video; |
| 556 | SDL_VideoDevice *this = current_video; |
| 557 | int x, y; |
| 558 | Uint8 *row; |
| 559 | |
| 560 | /* This function doesn't work on surfaces < 8 bpp */ |
| 561 | if ( dst->format->BitsPerPixel < 8 ) { |
| 562 | switch(dst->format->BitsPerPixel) { |
| 563 | case 1: |
| 564 | return SDL_FillRect1(dst, dstrect, color); |
| 565 | break; |
| 566 | case 4: |
| 567 | return SDL_FillRect4(dst, dstrect, color); |
| 568 | break; |
| 569 | default: |
| 570 | SDL_SetError("Fill rect on unsupported surface format"); |
| 571 | return(-1); |
| 572 | break; |
| 573 | } |
| 574 | } |
| 575 | |
| 576 | /* If 'dstrect' == NULL, then fill the whole surface */ |
| 577 | if ( dstrect ) { |
| 578 | /* Perform clipping */ |
| 579 | if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) { |
| 580 | return(0); |
| 581 | } |
| 582 | } else { |
| 583 | dstrect = &dst->clip_rect; |
| 584 | } |
| 585 | |
| 586 | /* Check for hardware acceleration */ |
| 587 | if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && |
| 588 | video->info.blit_fill ) { |
| 589 | SDL_Rect hw_rect; |
| 590 | if ( dst == SDL_VideoSurface ) { |
| 591 | hw_rect = *dstrect; |
| 592 | hw_rect.x += current_video->offset_x; |
| 593 | hw_rect.y += current_video->offset_y; |
| 594 | dstrect = &hw_rect; |
| 595 | } |
| 596 | return(video->FillHWRect(this, dst, dstrect, color)); |
| 597 | } |
| 598 | |
| 599 | /* Perform software fill */ |
| 600 | if ( SDL_LockSurface(dst) != 0 ) { |
| 601 | return(-1); |
| 602 | } |
| 603 | row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+ |
| 604 | dstrect->x*dst->format->BytesPerPixel; |
| 605 | if ( dst->format->palette || (color == 0) ) { |
| 606 | x = dstrect->w*dst->format->BytesPerPixel; |
| 607 | if ( !color && !((uintptr_t)row&3) && !(x&3) && !(dst->pitch&3) ) { |
| 608 | int n = x >> 2; |
| 609 | for ( y=dstrect->h; y; --y ) { |
| 610 | SDL_memset4(row, 0, n); |
| 611 | row += dst->pitch; |
| 612 | } |
| 613 | } else { |
| 614 | #ifdef __powerpc__ |
| 615 | /* |
| 616 | * SDL_memset() on PPC (both glibc and codewarrior) uses |
| 617 | * the dcbz (Data Cache Block Zero) instruction, which |
| 618 | * causes an alignment exception if the destination is |
| 619 | * uncachable, so only use it on software surfaces |
| 620 | */ |
| 621 | if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) { |
| 622 | if(dstrect->w >= 8) { |
| 623 | /* |
| 624 | * 64-bit stores are probably most |
| 625 | * efficient to uncached video memory |
| 626 | */ |
| 627 | double fill; |
| 628 | SDL_memset(&fill, color, (sizeof fill)); |
| 629 | for(y = dstrect->h; y; y--) { |
| 630 | Uint8 *d = row; |
| 631 | unsigned n = x; |
| 632 | unsigned nn; |
| 633 | Uint8 c = color; |
| 634 | double f = fill; |
| 635 | while((unsigned long)d |
| 636 | & (sizeof(double) - 1)) { |
| 637 | *d++ = c; |
| 638 | n--; |
| 639 | } |
| 640 | nn = n / (sizeof(double) * 4); |
| 641 | while(nn) { |
| 642 | ((double *)d)[0] = f; |
| 643 | ((double *)d)[1] = f; |
| 644 | ((double *)d)[2] = f; |
| 645 | ((double *)d)[3] = f; |
| 646 | d += 4*sizeof(double); |
| 647 | nn--; |
| 648 | } |
| 649 | n &= ~(sizeof(double) * 4 - 1); |
| 650 | nn = n / sizeof(double); |
| 651 | while(nn) { |
| 652 | *(double *)d = f; |
| 653 | d += sizeof(double); |
| 654 | nn--; |
| 655 | } |
| 656 | n &= ~(sizeof(double) - 1); |
| 657 | while(n) { |
| 658 | *d++ = c; |
| 659 | n--; |
| 660 | } |
| 661 | row += dst->pitch; |
| 662 | } |
| 663 | } else { |
| 664 | /* narrow boxes */ |
| 665 | for(y = dstrect->h; y; y--) { |
| 666 | Uint8 *d = row; |
| 667 | Uint8 c = color; |
| 668 | int n = x; |
| 669 | while(n) { |
| 670 | *d++ = c; |
| 671 | n--; |
| 672 | } |
| 673 | row += dst->pitch; |
| 674 | } |
| 675 | } |
| 676 | } else |
| 677 | #endif /* __powerpc__ */ |
| 678 | { |
| 679 | for(y = dstrect->h; y; y--) { |
| 680 | SDL_memset(row, color, x); |
| 681 | row += dst->pitch; |
| 682 | } |
| 683 | } |
| 684 | } |
| 685 | } else { |
| 686 | switch (dst->format->BytesPerPixel) { |
| 687 | case 2: |
| 688 | for ( y=dstrect->h; y; --y ) { |
| 689 | Uint16 *pixels = (Uint16 *)row; |
| 690 | Uint16 c = (Uint16)color; |
| 691 | Uint32 cc = (Uint32)c << 16 | c; |
| 692 | int n = dstrect->w; |
| 693 | if((uintptr_t)pixels & 3) { |
| 694 | *pixels++ = c; |
| 695 | n--; |
| 696 | } |
| 697 | if(n >> 1) |
| 698 | SDL_memset4(pixels, cc, n >> 1); |
| 699 | if(n & 1) |
| 700 | pixels[n - 1] = c; |
| 701 | row += dst->pitch; |
| 702 | } |
| 703 | break; |
| 704 | |
| 705 | case 3: |
| 706 | #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
| 707 | color <<= 8; |
| 708 | #endif |
| 709 | for ( y=dstrect->h; y; --y ) { |
| 710 | Uint8 *pixels = row; |
| 711 | for ( x=dstrect->w; x; --x ) { |
| 712 | SDL_memcpy(pixels, &color, 3); |
| 713 | pixels += 3; |
| 714 | } |
| 715 | row += dst->pitch; |
| 716 | } |
| 717 | break; |
| 718 | |
| 719 | case 4: |
| 720 | for(y = dstrect->h; y; --y) { |
| 721 | SDL_memset4(row, color, dstrect->w); |
| 722 | row += dst->pitch; |
| 723 | } |
| 724 | break; |
| 725 | } |
| 726 | } |
| 727 | SDL_UnlockSurface(dst); |
| 728 | |
| 729 | /* We're done! */ |
| 730 | return(0); |
| 731 | } |
| 732 | |
| 733 | /* |
| 734 | * Lock a surface to directly access the pixels |
| 735 | */ |
| 736 | int SDL_LockSurface (SDL_Surface *surface) |
| 737 | { |
| 738 | if ( ! surface->locked ) { |
| 739 | /* Perform the lock */ |
| 740 | if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { |
| 741 | SDL_VideoDevice *video = current_video; |
| 742 | SDL_VideoDevice *this = current_video; |
| 743 | if ( video->LockHWSurface(this, surface) < 0 ) { |
| 744 | return(-1); |
| 745 | } |
| 746 | } |
| 747 | if ( surface->flags & SDL_RLEACCEL ) { |
| 748 | SDL_UnRLESurface(surface, 1); |
| 749 | surface->flags |= SDL_RLEACCEL; /* save accel'd state */ |
| 750 | } |
| 751 | /* This needs to be done here in case pixels changes value */ |
| 752 | surface->pixels = (Uint8 *)surface->pixels + surface->offset; |
| 753 | } |
| 754 | |
| 755 | /* Increment the surface lock count, for recursive locks */ |
| 756 | ++surface->locked; |
| 757 | |
| 758 | /* Ready to go.. */ |
| 759 | return(0); |
| 760 | } |
| 761 | /* |
| 762 | * Unlock a previously locked surface |
| 763 | */ |
| 764 | void SDL_UnlockSurface (SDL_Surface *surface) |
| 765 | { |
| 766 | /* Only perform an unlock if we are locked */ |
| 767 | if ( ! surface->locked || (--surface->locked > 0) ) { |
| 768 | return; |
| 769 | } |
| 770 | |
| 771 | /* Perform the unlock */ |
| 772 | surface->pixels = (Uint8 *)surface->pixels - surface->offset; |
| 773 | |
| 774 | /* Unlock hardware or accelerated surfaces */ |
| 775 | if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { |
| 776 | SDL_VideoDevice *video = current_video; |
| 777 | SDL_VideoDevice *this = current_video; |
| 778 | video->UnlockHWSurface(this, surface); |
| 779 | } else { |
| 780 | /* Update RLE encoded surface with new data */ |
| 781 | if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { |
| 782 | surface->flags &= ~SDL_RLEACCEL; /* stop lying */ |
| 783 | SDL_RLESurface(surface); |
| 784 | } |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | /* |
| 789 | * Convert a surface into the specified pixel format. |
| 790 | */ |
| 791 | SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface, |
| 792 | SDL_PixelFormat *format, Uint32 flags) |
| 793 | { |
| 794 | SDL_Surface *convert; |
| 795 | Uint32 colorkey = 0; |
| 796 | Uint8 alpha = 0; |
| 797 | Uint32 surface_flags; |
| 798 | SDL_Rect bounds; |
| 799 | |
| 800 | /* Check for empty destination palette! (results in empty image) */ |
| 801 | if ( format->palette != NULL ) { |
| 802 | int i; |
| 803 | for ( i=0; i<format->palette->ncolors; ++i ) { |
| 804 | if ( (format->palette->colors[i].r != 0) || |
| 805 | (format->palette->colors[i].g != 0) || |
| 806 | (format->palette->colors[i].b != 0) ) |
| 807 | break; |
| 808 | } |
| 809 | if ( i == format->palette->ncolors ) { |
| 810 | SDL_SetError("Empty destination palette"); |
| 811 | return(NULL); |
| 812 | } |
| 813 | } |
| 814 | |
| 815 | /* Only create hw surfaces with alpha channel if hw alpha blits |
| 816 | are supported */ |
| 817 | if(format->Amask != 0 && (flags & SDL_HWSURFACE)) { |
| 818 | const SDL_VideoInfo *vi = SDL_GetVideoInfo(); |
| 819 | if(!vi || !vi->blit_hw_A) |
| 820 | flags &= ~SDL_HWSURFACE; |
| 821 | } |
| 822 | |
| 823 | /* Create a new surface with the desired format */ |
| 824 | convert = SDL_CreateRGBSurface(flags, |
| 825 | surface->w, surface->h, format->BitsPerPixel, |
| 826 | format->Rmask, format->Gmask, format->Bmask, format->Amask); |
| 827 | if ( convert == NULL ) { |
| 828 | return(NULL); |
| 829 | } |
| 830 | |
| 831 | /* Copy the palette if any */ |
| 832 | if ( format->palette && convert->format->palette ) { |
| 833 | SDL_memcpy(convert->format->palette->colors, |
| 834 | format->palette->colors, |
| 835 | format->palette->ncolors*sizeof(SDL_Color)); |
| 836 | convert->format->palette->ncolors = format->palette->ncolors; |
| 837 | } |
| 838 | |
| 839 | /* Save the original surface color key and alpha */ |
| 840 | surface_flags = surface->flags; |
| 841 | if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { |
| 842 | /* Convert colourkeyed surfaces to RGBA if requested */ |
| 843 | if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY |
| 844 | && format->Amask) { |
| 845 | surface_flags &= ~SDL_SRCCOLORKEY; |
| 846 | } else { |
| 847 | colorkey = surface->format->colorkey; |
| 848 | SDL_SetColorKey(surface, 0, 0); |
| 849 | } |
| 850 | } |
| 851 | if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
| 852 | /* Copy over the alpha channel to RGBA if requested */ |
| 853 | if ( format->Amask ) { |
| 854 | surface->flags &= ~SDL_SRCALPHA; |
| 855 | } else { |
| 856 | alpha = surface->format->alpha; |
| 857 | SDL_SetAlpha(surface, 0, 0); |
| 858 | } |
| 859 | } |
| 860 | |
| 861 | /* Copy over the image data */ |
| 862 | bounds.x = 0; |
| 863 | bounds.y = 0; |
| 864 | bounds.w = surface->w; |
| 865 | bounds.h = surface->h; |
| 866 | SDL_LowerBlit(surface, &bounds, convert, &bounds); |
| 867 | |
| 868 | /* Clean up the original surface, and update converted surface */ |
| 869 | if ( convert != NULL ) { |
| 870 | SDL_SetClipRect(convert, &surface->clip_rect); |
| 871 | } |
| 872 | if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { |
| 873 | Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK); |
| 874 | if ( convert != NULL ) { |
| 875 | Uint8 keyR, keyG, keyB; |
| 876 | |
| 877 | SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB); |
| 878 | SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK), |
| 879 | SDL_MapRGB(convert->format, keyR, keyG, keyB)); |
| 880 | } |
| 881 | SDL_SetColorKey(surface, cflags, colorkey); |
| 882 | } |
| 883 | if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { |
| 884 | Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK); |
| 885 | if ( convert != NULL ) { |
| 886 | SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK), |
| 887 | alpha); |
| 888 | } |
| 889 | if ( format->Amask ) { |
| 890 | surface->flags |= SDL_SRCALPHA; |
| 891 | } else { |
| 892 | SDL_SetAlpha(surface, aflags, alpha); |
| 893 | } |
| 894 | } |
| 895 | |
| 896 | /* We're ready to go! */ |
| 897 | return(convert); |
| 898 | } |
| 899 | |
| 900 | /* |
| 901 | * Free a surface created by the above function. |
| 902 | */ |
| 903 | void SDL_FreeSurface (SDL_Surface *surface) |
| 904 | { |
| 905 | /* Free anything that's not NULL, and not the screen surface */ |
| 906 | if ((surface == NULL) || |
| 907 | (current_video && |
| 908 | ((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) { |
| 909 | return; |
| 910 | } |
| 911 | if ( --surface->refcount > 0 ) { |
| 912 | return; |
| 913 | } |
| 914 | while ( surface->locked > 0 ) { |
| 915 | SDL_UnlockSurface(surface); |
| 916 | } |
| 917 | if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { |
| 918 | SDL_UnRLESurface(surface, 0); |
| 919 | } |
| 920 | if ( surface->format ) { |
| 921 | SDL_FreeFormat(surface->format); |
| 922 | surface->format = NULL; |
| 923 | } |
| 924 | if ( surface->map != NULL ) { |
| 925 | SDL_FreeBlitMap(surface->map); |
| 926 | surface->map = NULL; |
| 927 | } |
| 928 | if ( surface->hwdata ) { |
| 929 | SDL_VideoDevice *video = current_video; |
| 930 | SDL_VideoDevice *this = current_video; |
| 931 | video->FreeHWSurface(this, surface); |
| 932 | } |
| 933 | if ( surface->pixels && |
| 934 | ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) { |
| 935 | SDL_free(surface->pixels); |
| 936 | } |
| 937 | SDL_free(surface); |
| 938 | #ifdef CHECK_LEAKS |
| 939 | --surfaces_allocated; |
| 940 | #endif |
| 941 | } |