Mercurial > sdl-ios-xcode
annotate src/video/SDL_surface.c @ 431:41cadcba32e8
Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 01 Aug 2002 23:06:39 +0000 |
| parents | b1b9ee41be70 |
| children | 598b25b9bffe |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
297
f6ffac90895c
Updated copyright information for 2002
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|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 | |
|
252
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Updated the source with the correct e-mail address
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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 <stdlib.h> | |
| 30 #include <string.h> | |
| 31 | |
| 32 #include "SDL_error.h" | |
| 33 #include "SDL_video.h" | |
| 34 #include "SDL_sysvideo.h" | |
| 35 #include "SDL_cursor_c.h" | |
| 36 #include "SDL_blit.h" | |
| 37 #include "SDL_RLEaccel_c.h" | |
| 38 #include "SDL_pixels_c.h" | |
| 39 #include "SDL_memops.h" | |
| 40 #include "SDL_leaks.h" | |
| 41 | |
| 42 /* Public routines */ | |
| 43 /* | |
| 44 * Create an empty RGB surface of the appropriate depth | |
| 45 */ | |
| 46 SDL_Surface * SDL_CreateRGBSurface (Uint32 flags, | |
| 47 int width, int height, int depth, | |
| 48 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 49 { | |
| 50 SDL_VideoDevice *video = current_video; | |
| 51 SDL_VideoDevice *this = current_video; | |
| 52 SDL_Surface *screen; | |
| 53 SDL_Surface *surface; | |
| 54 | |
| 55 /* Check to see if we desire the surface in video memory */ | |
| 56 if ( video ) { | |
| 57 screen = SDL_PublicSurface; | |
| 58 } else { | |
| 59 screen = NULL; | |
| 60 } | |
| 61 if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 62 if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) { | |
| 63 flags |= SDL_HWSURFACE; | |
| 64 } | |
| 65 if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 66 if ( ! current_video->info.blit_hw_CC ) { | |
| 67 flags &= ~SDL_HWSURFACE; | |
| 68 } | |
| 69 } | |
| 70 if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
| 71 if ( ! current_video->info.blit_hw_A ) { | |
| 72 flags &= ~SDL_HWSURFACE; | |
| 73 } | |
| 74 } | |
| 75 } else { | |
| 76 flags &= ~SDL_HWSURFACE; | |
| 77 } | |
| 78 | |
| 79 /* Allocate the surface */ | |
| 80 surface = (SDL_Surface *)malloc(sizeof(*surface)); | |
| 81 if ( surface == NULL ) { | |
| 82 SDL_OutOfMemory(); | |
| 83 return(NULL); | |
| 84 } | |
| 85 surface->flags = SDL_SWSURFACE; | |
| 86 if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 87 depth = screen->format->BitsPerPixel; | |
| 88 Rmask = screen->format->Rmask; | |
| 89 Gmask = screen->format->Gmask; | |
| 90 Bmask = screen->format->Bmask; | |
| 91 Amask = screen->format->Amask; | |
| 92 } | |
| 93 surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask); | |
| 94 if ( surface->format == NULL ) { | |
| 95 free(surface); | |
| 96 return(NULL); | |
| 97 } | |
| 98 if ( Amask ) { | |
| 99 surface->flags |= SDL_SRCALPHA; | |
| 100 } | |
| 101 surface->w = width; | |
| 102 surface->h = height; | |
| 103 surface->pitch = SDL_CalculatePitch(surface); | |
| 104 surface->pixels = NULL; | |
| 105 surface->offset = 0; | |
| 106 surface->hwdata = NULL; | |
| 107 surface->locked = 0; | |
| 108 surface->map = NULL; | |
| 109 surface->format_version = 0; | |
| 110 SDL_SetClipRect(surface, NULL); | |
| 111 | |
| 112 /* Get the pixels */ | |
| 113 if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) || | |
| 114 (video->AllocHWSurface(this, surface) < 0) ) { | |
| 115 if ( surface->w && surface->h ) { | |
| 116 surface->pixels = malloc(surface->h*surface->pitch); | |
| 117 if ( surface->pixels == NULL ) { | |
| 118 SDL_FreeSurface(surface); | |
| 119 SDL_OutOfMemory(); | |
| 120 return(NULL); | |
| 121 } | |
| 122 /* This is important for bitmaps */ | |
| 123 memset(surface->pixels, 0, surface->h*surface->pitch); | |
| 124 } | |
| 125 } | |
| 126 | |
| 127 /* Allocate an empty mapping */ | |
| 128 surface->map = SDL_AllocBlitMap(); | |
| 129 if ( surface->map == NULL ) { | |
| 130 SDL_FreeSurface(surface); | |
| 131 return(NULL); | |
| 132 } | |
| 133 | |
| 134 /* The surface is ready to go */ | |
| 135 surface->refcount = 1; | |
| 136 #ifdef CHECK_LEAKS | |
| 137 ++surfaces_allocated; | |
| 138 #endif | |
| 139 return(surface); | |
| 140 } | |
| 141 /* | |
| 142 * Create an RGB surface from an existing memory buffer | |
| 143 */ | |
| 144 SDL_Surface * SDL_CreateRGBSurfaceFrom (void *pixels, | |
| 145 int width, int height, int depth, int pitch, | |
| 146 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 147 { | |
| 148 SDL_Surface *surface; | |
| 149 | |
| 150 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, depth, | |
| 151 Rmask, Gmask, Bmask, Amask); | |
| 152 if ( surface != NULL ) { | |
| 153 surface->flags |= SDL_PREALLOC; | |
| 154 surface->pixels = pixels; | |
| 155 surface->w = width; | |
| 156 surface->h = height; | |
| 157 surface->pitch = pitch; | |
| 158 SDL_SetClipRect(surface, NULL); | |
| 159 } | |
| 160 return(surface); | |
| 161 } | |
| 162 /* | |
| 163 * Set the color key in a blittable surface | |
| 164 */ | |
| 165 int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key) | |
| 166 { | |
| 167 /* Sanity check the flag as it gets passed in */ | |
| 168 if ( flag & SDL_SRCCOLORKEY ) { | |
| 169 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { | |
| 170 flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK); | |
| 171 } else { | |
| 172 flag = SDL_SRCCOLORKEY; | |
| 173 } | |
| 174 } else { | |
| 175 flag = 0; | |
| 176 } | |
| 177 | |
| 178 /* Optimize away operations that don't change anything */ | |
| 179 if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) && | |
| 180 (key == surface->format->colorkey) ) { | |
| 181 return(0); | |
| 182 } | |
| 183 | |
| 184 /* UnRLE surfaces before we change the colorkey */ | |
| 185 if ( surface->flags & SDL_RLEACCEL ) { | |
| 186 SDL_UnRLESurface(surface, 1); | |
| 187 } | |
| 188 | |
| 189 if ( flag ) { | |
| 190 SDL_VideoDevice *video = current_video; | |
| 191 SDL_VideoDevice *this = current_video; | |
| 192 | |
| 193 | |
| 194 surface->flags |= SDL_SRCCOLORKEY; | |
| 195 surface->format->colorkey = key; | |
| 196 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 197 if ( (video->SetHWColorKey == NULL) || | |
| 198 (video->SetHWColorKey(this, surface, key) < 0) ) { | |
| 199 surface->flags &= ~SDL_HWACCEL; | |
| 200 } | |
| 201 } | |
| 202 if ( flag & SDL_RLEACCELOK ) { | |
| 203 surface->flags |= SDL_RLEACCELOK; | |
| 204 } else { | |
| 205 surface->flags &= ~SDL_RLEACCELOK; | |
| 206 } | |
| 207 } else { | |
| 208 surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK); | |
| 209 surface->format->colorkey = 0; | |
| 210 } | |
| 211 SDL_InvalidateMap(surface->map); | |
| 212 return(0); | |
| 213 } | |
|
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41cadcba32e8
Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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parents:
422
diff
changeset
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214 /* This function sets the alpha channel of a surface */ |
| 0 | 215 int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value) |
| 216 { | |
| 217 Uint32 oldflags = surface->flags; | |
| 218 Uint32 oldalpha = surface->format->alpha; | |
| 219 | |
| 220 /* Sanity check the flag as it gets passed in */ | |
| 221 if ( flag & SDL_SRCALPHA ) { | |
| 222 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { | |
| 223 flag = (SDL_SRCALPHA | SDL_RLEACCELOK); | |
| 224 } else { | |
| 225 flag = SDL_SRCALPHA; | |
| 226 } | |
| 227 } else { | |
| 228 flag = 0; | |
| 229 } | |
| 230 | |
| 231 /* Optimize away operations that don't change anything */ | |
| 232 if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) && | |
| 233 (!flag || value == oldalpha) ) { | |
| 234 return(0); | |
| 235 } | |
| 236 | |
| 237 if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL)) | |
| 238 SDL_UnRLESurface(surface, 1); | |
| 239 | |
| 240 if ( flag ) { | |
| 241 SDL_VideoDevice *video = current_video; | |
| 242 SDL_VideoDevice *this = current_video; | |
| 243 | |
| 244 surface->flags |= SDL_SRCALPHA; | |
| 245 surface->format->alpha = value; | |
| 246 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 247 if ( (video->SetHWAlpha == NULL) || | |
| 248 (video->SetHWAlpha(this, surface, value) < 0) ) { | |
| 249 surface->flags &= ~SDL_HWACCEL; | |
| 250 } | |
| 251 } | |
| 252 if ( flag & SDL_RLEACCELOK ) { | |
| 253 surface->flags |= SDL_RLEACCELOK; | |
| 254 } else { | |
| 255 surface->flags &= ~SDL_RLEACCELOK; | |
| 256 } | |
| 257 } else { | |
| 258 surface->flags &= ~SDL_SRCALPHA; | |
| 259 surface->format->alpha = SDL_ALPHA_OPAQUE; | |
| 260 } | |
| 261 /* | |
| 262 * The representation for software surfaces is independent of | |
| 263 * per-surface alpha, so no need to invalidate the blit mapping | |
| 264 * if just the alpha value was changed. (If either is 255, we still | |
| 265 * need to invalidate.) | |
| 266 */ | |
| 267 if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL | |
| 268 || oldflags != surface->flags | |
| 269 || (((oldalpha + 1) ^ (value + 1)) & 0x100)) | |
| 270 SDL_InvalidateMap(surface->map); | |
| 271 return(0); | |
| 272 } | |
|
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Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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changeset
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273 int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value) |
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274 { |
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275 int row, col; |
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276 int offset; |
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277 Uint8 *buf; |
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278 |
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279 if ( (surface->format->Amask != 0xFF000000) && |
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280 (surface->format->Amask != 0x000000FF) ) { |
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281 SDL_SetError("Unsupported surface alpha mask format"); |
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282 return -1; |
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283 } |
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284 |
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285 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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286 if ( surface->format->Amask == 0xFF000000 ) { |
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287 offset = 3; |
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288 } else { |
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289 offset = 0; |
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290 } |
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291 #else |
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292 if ( surface->format->Amask == 0xFF000000 ) { |
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293 offset = 0; |
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294 } else { |
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295 offset = 3; |
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296 } |
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297 #endif /* Byte ordering */ |
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298 |
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299 /* Quickly set the alpha channel of an RGBA or ARGB surface */ |
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300 if ( SDL_MUSTLOCK(surface) ) { |
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301 if ( SDL_LockSurface(surface) < 0 ) { |
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302 return -1; |
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303 } |
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304 } |
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305 row = surface->h; |
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306 while (row--) { |
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307 col = surface->w; |
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308 buf = (Uint8 *)surface->pixels + row * surface->pitch + offset; |
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309 while(col--) { |
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310 *buf = value; |
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311 buf += 4; |
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312 } |
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313 } |
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314 if ( SDL_MUSTLOCK(surface) ) { |
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315 SDL_UnlockSurface(surface); |
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316 } |
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317 return 0; |
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318 } |
| 0 | 319 |
| 320 /* | |
| 321 * A function to calculate the intersection of two rectangles: | |
| 322 * return true if the rectangles intersect, false otherwise | |
| 323 */ | |
| 324 static __inline__ | |
|
130
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325 SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection) |
| 0 | 326 { |
| 327 int Amin, Amax, Bmin, Bmax; | |
| 328 | |
| 329 /* Horizontal intersection */ | |
| 330 Amin = A->x; | |
| 331 Amax = Amin + A->w; | |
| 332 Bmin = B->x; | |
| 333 Bmax = Bmin + B->w; | |
| 334 if(Bmin > Amin) | |
| 335 Amin = Bmin; | |
| 336 intersection->x = Amin; | |
| 337 if(Bmax < Amax) | |
| 338 Amax = Bmax; | |
| 339 intersection->w = Amax - Amin > 0 ? Amax - Amin : 0; | |
| 340 | |
| 341 /* Vertical intersection */ | |
| 342 Amin = A->y; | |
| 343 Amax = Amin + A->h; | |
| 344 Bmin = B->y; | |
| 345 Bmax = Bmin + B->h; | |
| 346 if(Bmin > Amin) | |
| 347 Amin = Bmin; | |
| 348 intersection->y = Amin; | |
| 349 if(Bmax < Amax) | |
| 350 Amax = Bmax; | |
| 351 intersection->h = Amax - Amin > 0 ? Amax - Amin : 0; | |
| 352 | |
| 353 return (intersection->w && intersection->h); | |
| 354 } | |
| 355 /* | |
| 356 * Set the clipping rectangle for a blittable surface | |
| 357 */ | |
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358 SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect) |
| 0 | 359 { |
| 360 SDL_Rect full_rect; | |
| 361 | |
| 362 /* Don't do anything if there's no surface to act on */ | |
| 363 if ( ! surface ) { | |
| 364 return SDL_FALSE; | |
| 365 } | |
| 366 | |
| 367 /* Set up the full surface rectangle */ | |
| 368 full_rect.x = 0; | |
| 369 full_rect.y = 0; | |
| 370 full_rect.w = surface->w; | |
| 371 full_rect.h = surface->h; | |
| 372 | |
| 373 /* Set the clipping rectangle */ | |
| 374 if ( ! rect ) { | |
| 375 surface->clip_rect = full_rect; | |
| 376 return 1; | |
| 377 } | |
| 378 return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect); | |
| 379 } | |
| 380 void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect) | |
| 381 { | |
| 382 if ( surface && rect ) { | |
| 383 *rect = surface->clip_rect; | |
| 384 } | |
| 385 } | |
| 386 /* | |
| 387 * Set up a blit between two surfaces -- split into three parts: | |
| 388 * The upper part, SDL_UpperBlit(), performs clipping and rectangle | |
| 389 * verification. The lower part is a pointer to a low level | |
| 390 * accelerated blitting function. | |
| 391 * | |
| 392 * These parts are separated out and each used internally by this | |
| 393 * library in the optimimum places. They are exported so that if | |
| 394 * you know exactly what you are doing, you can optimize your code | |
| 395 * by calling the one(s) you need. | |
| 396 */ | |
| 397 int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect, | |
| 398 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 399 { | |
| 400 SDL_blit do_blit; | |
| 401 | |
| 402 /* Check to make sure the blit mapping is valid */ | |
| 403 if ( (src->map->dst != dst) || | |
| 404 (src->map->dst->format_version != src->map->format_version) ) { | |
| 405 if ( SDL_MapSurface(src, dst) < 0 ) { | |
| 406 return(-1); | |
| 407 } | |
| 408 } | |
| 409 | |
| 410 /* Figure out which blitter to use */ | |
| 411 if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 412 do_blit = src->map->hw_blit; | |
| 413 } else { | |
| 414 do_blit = src->map->sw_blit; | |
| 415 } | |
| 416 return(do_blit(src, srcrect, dst, dstrect)); | |
| 417 } | |
| 418 | |
| 419 | |
| 420 int SDL_UpperBlit (SDL_Surface *src, SDL_Rect *srcrect, | |
| 421 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 422 { | |
| 423 SDL_Rect fulldst; | |
| 424 int srcx, srcy, w, h; | |
| 425 | |
| 426 /* Make sure the surfaces aren't locked */ | |
| 427 if ( ! src || ! dst ) { | |
| 428 SDL_SetError("SDL_UpperBlit: passed a NULL surface"); | |
| 429 return(-1); | |
| 430 } | |
| 431 if ( src->locked || dst->locked ) { | |
| 432 SDL_SetError("Surfaces must not be locked during blit"); | |
| 433 return(-1); | |
| 434 } | |
| 435 | |
| 436 /* If the destination rectangle is NULL, use the entire dest surface */ | |
| 437 if ( dstrect == NULL ) { | |
| 438 fulldst.x = fulldst.y = 0; | |
| 439 dstrect = &fulldst; | |
| 440 } | |
| 441 | |
| 442 /* clip the source rectangle to the source surface */ | |
| 443 if(srcrect) { | |
| 444 int maxw, maxh; | |
| 445 | |
| 446 srcx = srcrect->x; | |
| 447 w = srcrect->w; | |
| 448 if(srcx < 0) { | |
| 449 w += srcx; | |
| 450 dstrect->x -= srcx; | |
| 451 srcx = 0; | |
| 452 } | |
| 453 maxw = src->w - srcx; | |
| 454 if(maxw < w) | |
| 455 w = maxw; | |
| 456 | |
| 457 srcy = srcrect->y; | |
| 458 h = srcrect->h; | |
| 459 if(srcy < 0) { | |
| 460 h += srcy; | |
| 461 dstrect->y -= srcy; | |
| 462 srcy = 0; | |
| 463 } | |
| 464 maxh = src->h - srcy; | |
| 465 if(maxh < h) | |
| 466 h = maxh; | |
| 467 | |
| 468 } else { | |
| 469 srcx = srcy = 0; | |
| 470 w = src->w; | |
| 471 h = src->h; | |
| 472 } | |
| 473 | |
| 474 /* clip the destination rectangle against the clip rectangle */ | |
| 475 { | |
| 476 SDL_Rect *clip = &dst->clip_rect; | |
| 477 int dx, dy; | |
| 478 | |
| 479 dx = clip->x - dstrect->x; | |
| 480 if(dx > 0) { | |
| 481 w -= dx; | |
| 482 dstrect->x += dx; | |
| 483 srcx += dx; | |
| 484 } | |
| 485 dx = dstrect->x + w - clip->x - clip->w; | |
| 486 if(dx > 0) | |
| 487 w -= dx; | |
| 488 | |
| 489 dy = clip->y - dstrect->y; | |
| 490 if(dy > 0) { | |
| 491 h -= dy; | |
| 492 dstrect->y += dy; | |
| 493 srcy += dy; | |
| 494 } | |
| 495 dy = dstrect->y + h - clip->y - clip->h; | |
| 496 if(dy > 0) | |
| 497 h -= dy; | |
| 498 } | |
| 499 | |
| 500 if(w > 0 && h > 0) { | |
| 501 SDL_Rect sr; | |
| 502 sr.x = srcx; | |
| 503 sr.y = srcy; | |
| 504 sr.w = dstrect->w = w; | |
| 505 sr.h = dstrect->h = h; | |
| 506 return SDL_LowerBlit(src, &sr, dst, dstrect); | |
| 507 } | |
| 508 dstrect->w = dstrect->h = 0; | |
| 509 return 0; | |
| 510 } | |
| 511 | |
| 512 /* | |
| 513 * This function performs a fast fill of the given rectangle with 'color' | |
| 514 */ | |
| 515 int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) | |
| 516 { | |
| 517 SDL_VideoDevice *video = current_video; | |
| 518 SDL_VideoDevice *this = current_video; | |
| 519 int x, y; | |
| 520 Uint8 *row; | |
| 521 | |
| 522 /* If 'dstrect' == NULL, then fill the whole surface */ | |
| 523 if ( dstrect ) { | |
| 524 /* Perform clipping */ | |
| 525 if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) { | |
| 526 return(0); | |
| 527 } | |
| 528 } else { | |
| 529 dstrect = &dst->clip_rect; | |
| 530 } | |
| 531 | |
| 532 /* Check for hardware acceleration */ | |
| 533 if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 534 video->info.blit_fill ) { | |
| 535 return(video->FillHWRect(this, dst, dstrect, color)); | |
| 536 } | |
| 537 | |
| 538 /* Perform software fill */ | |
| 539 if ( SDL_LockSurface(dst) != 0 ) { | |
| 540 return(-1); | |
| 541 } | |
| 542 row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+ | |
| 543 dstrect->x*dst->format->BytesPerPixel; | |
| 544 if ( dst->format->palette || (color == 0) ) { | |
| 545 x = dstrect->w*dst->format->BytesPerPixel; | |
| 546 if ( !color && !((long)row&3) && !(x&3) && !(dst->pitch&3) ) { | |
| 547 int n = x >> 2; | |
| 548 for ( y=dstrect->h; y; --y ) { | |
| 549 SDL_memset4(row, 0, n); | |
| 550 row += dst->pitch; | |
| 551 } | |
| 552 } else { | |
| 553 #ifdef __powerpc__ | |
| 554 /* | |
| 555 * memset() on PPC (both glibc and codewarrior) uses | |
| 556 * the dcbz (Data Cache Block Zero) instruction, which | |
| 557 * causes an alignment exception if the destination is | |
| 558 * uncachable, so only use it on software surfaces | |
| 559 */ | |
| 560 if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) { | |
| 561 if(dstrect->w >= 8) { | |
| 562 /* | |
| 563 * 64-bit stores are probably most | |
| 564 * efficient to uncached video memory | |
| 565 */ | |
| 566 double fill; | |
| 567 memset(&fill, color, (sizeof fill)); | |
| 568 for(y = dstrect->h; y; y--) { | |
| 569 Uint8 *d = row; | |
| 570 unsigned n = x; | |
| 571 unsigned nn; | |
| 572 Uint8 c = color; | |
| 573 double f = fill; | |
| 574 while((unsigned long)d | |
| 575 & (sizeof(double) - 1)) { | |
| 576 *d++ = c; | |
| 577 n--; | |
| 578 } | |
| 579 nn = n / (sizeof(double) * 4); | |
| 580 while(nn) { | |
| 581 ((double *)d)[0] = f; | |
| 582 ((double *)d)[1] = f; | |
| 583 ((double *)d)[2] = f; | |
| 584 ((double *)d)[3] = f; | |
| 585 d += 4*sizeof(double); | |
| 586 nn--; | |
| 587 } | |
| 588 n &= ~(sizeof(double) * 4 - 1); | |
| 589 nn = n / sizeof(double); | |
| 590 while(nn) { | |
| 591 *(double *)d = f; | |
| 592 d += sizeof(double); | |
| 593 nn--; | |
| 594 } | |
| 595 n &= ~(sizeof(double) - 1); | |
| 596 while(n) { | |
| 597 *d++ = c; | |
| 598 n--; | |
| 599 } | |
| 600 row += dst->pitch; | |
| 601 } | |
| 602 } else { | |
| 603 /* narrow boxes */ | |
| 604 for(y = dstrect->h; y; y--) { | |
| 605 Uint8 *d = row; | |
| 606 Uint8 c = color; | |
| 607 int n = x; | |
| 608 while(n) { | |
| 609 *d++ = c; | |
| 610 n--; | |
| 611 } | |
| 612 row += dst->pitch; | |
| 613 } | |
| 614 } | |
| 615 } else | |
| 616 #endif /* __powerpc__ */ | |
| 617 { | |
| 618 for(y = dstrect->h; y; y--) { | |
| 619 memset(row, color, x); | |
| 620 row += dst->pitch; | |
| 621 } | |
| 622 } | |
| 623 } | |
| 624 } else { | |
| 625 switch (dst->format->BytesPerPixel) { | |
| 626 case 2: | |
| 627 for ( y=dstrect->h; y; --y ) { | |
| 628 Uint16 *pixels = (Uint16 *)row; | |
| 629 Uint16 c = color; | |
| 630 Uint32 cc = (Uint32)c << 16 | c; | |
| 631 int n = dstrect->w; | |
| 632 if((unsigned long)pixels & 3) { | |
| 633 *pixels++ = c; | |
| 634 n--; | |
| 635 } | |
| 636 if(n >> 1) | |
| 637 SDL_memset4(pixels, cc, n >> 1); | |
| 638 if(n & 1) | |
| 639 pixels[n - 1] = c; | |
| 640 row += dst->pitch; | |
| 641 } | |
| 642 break; | |
| 643 | |
| 644 case 3: | |
| 645 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) | |
| 646 color <<= 8; | |
| 647 for ( y=dstrect->h; y; --y ) { | |
| 648 Uint8 *pixels = row; | |
| 649 for ( x=dstrect->w; x; --x ) { | |
| 650 memcpy(pixels, &color, 3); | |
| 651 pixels += 3; | |
| 652 } | |
| 653 row += dst->pitch; | |
| 654 } | |
| 655 break; | |
| 656 | |
| 657 case 4: | |
| 658 for(y = dstrect->h; y; --y) { | |
| 659 SDL_memset4(row, color, dstrect->w); | |
| 660 row += dst->pitch; | |
| 661 } | |
| 662 break; | |
| 663 } | |
| 664 } | |
| 665 SDL_UnlockSurface(dst); | |
| 666 | |
| 667 /* We're done! */ | |
| 668 return(0); | |
| 669 } | |
| 670 | |
| 671 /* | |
| 672 * Lock a surface to directly access the pixels | |
| 673 * -- Do not call this from any blit function, as SDL_DrawCursor() may recurse | |
| 674 * Instead, use: | |
| 675 * if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) | |
| 676 * video->LockHWSurface(video, surface); | |
| 677 */ | |
| 678 int SDL_LockSurface (SDL_Surface *surface) | |
| 679 { | |
| 680 if ( ! surface->locked ) { | |
| 681 /* Perform the lock */ | |
| 682 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
| 683 SDL_VideoDevice *video = current_video; | |
| 684 SDL_VideoDevice *this = current_video; | |
| 685 if ( video->LockHWSurface(this, surface) < 0 ) { | |
| 686 return(-1); | |
| 687 } | |
| 688 } | |
| 689 if ( surface->flags & SDL_RLEACCEL ) { | |
| 690 SDL_UnRLESurface(surface, 1); | |
| 691 surface->flags |= SDL_RLEACCEL; /* save accel'd state */ | |
| 692 } | |
| 693 /* This needs to be done here in case pixels changes value */ | |
| 694 surface->pixels = (Uint8 *)surface->pixels + surface->offset; | |
| 695 } | |
| 696 | |
| 697 /* Increment the surface lock count, for recursive locks */ | |
| 698 ++surface->locked; | |
| 699 | |
| 700 /* Ready to go.. */ | |
| 701 return(0); | |
| 702 } | |
| 703 /* | |
| 704 * Unlock a previously locked surface | |
| 705 * -- Do not call this from any blit function, as SDL_DrawCursor() may recurse | |
| 706 * Instead, use: | |
| 707 * if ( (surface->flags & SDL_HWSURFACE) == SDL_HWSURFACE ) | |
| 708 * video->UnlockHWSurface(video, surface); | |
| 709 */ | |
| 710 void SDL_UnlockSurface (SDL_Surface *surface) | |
| 711 { | |
| 712 /* Only perform an unlock if we are locked */ | |
| 713 if ( ! surface->locked || (--surface->locked > 0) ) { | |
| 714 return; | |
| 715 } | |
| 716 | |
| 717 /* Perform the unlock */ | |
| 718 surface->pixels = (Uint8 *)surface->pixels - surface->offset; | |
| 719 | |
| 720 /* Unlock hardware or accelerated surfaces */ | |
| 721 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
| 722 SDL_VideoDevice *video = current_video; | |
| 723 SDL_VideoDevice *this = current_video; | |
| 724 video->UnlockHWSurface(this, surface); | |
| 725 } else { | |
| 726 /* Update RLE encoded surface with new data */ | |
| 727 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 728 surface->flags &= ~SDL_RLEACCEL; /* stop lying */ | |
| 729 SDL_RLESurface(surface); | |
| 730 } | |
| 731 } | |
| 732 } | |
| 733 | |
| 734 /* | |
| 735 * Convert a surface into the specified pixel format. | |
| 736 */ | |
| 737 SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface, | |
| 738 SDL_PixelFormat *format, Uint32 flags) | |
| 739 { | |
| 740 SDL_Surface *convert; | |
| 741 Uint32 colorkey = 0; | |
| 742 Uint8 alpha = 0; | |
| 743 Uint32 surface_flags; | |
| 744 SDL_Rect bounds; | |
| 745 | |
| 746 /* Check for empty destination palette! (results in empty image) */ | |
| 747 if ( format->palette != NULL ) { | |
| 748 int i; | |
| 749 for ( i=0; i<format->palette->ncolors; ++i ) { | |
| 750 if ( (format->palette->colors[i].r != 0) || | |
| 751 (format->palette->colors[i].g != 0) || | |
| 752 (format->palette->colors[i].b != 0) ) | |
| 753 break; | |
| 754 } | |
| 755 if ( i == format->palette->ncolors ) { | |
| 756 SDL_SetError("Empty destination palette"); | |
| 757 return(NULL); | |
| 758 } | |
| 759 } | |
| 760 | |
|
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761 /* Only create hw surfaces with alpha channel if hw alpha blits |
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762 are supported */ |
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763 if(format->Amask != 0 && (flags & SDL_HWSURFACE)) { |
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764 const SDL_VideoInfo *vi = SDL_GetVideoInfo(); |
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765 if(!vi || !vi->blit_hw_A) |
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766 flags &= ~SDL_HWSURFACE; |
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767 } |
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768 |
| 0 | 769 /* Create a new surface with the desired format */ |
| 770 convert = SDL_CreateRGBSurface(flags, | |
| 771 surface->w, surface->h, format->BitsPerPixel, | |
| 772 format->Rmask, format->Gmask, format->Bmask, format->Amask); | |
| 773 if ( convert == NULL ) { | |
| 774 return(NULL); | |
| 775 } | |
| 776 | |
| 777 /* Copy the palette if any */ | |
| 778 if ( format->palette && convert->format->palette ) { | |
| 779 memcpy(convert->format->palette->colors, | |
| 780 format->palette->colors, | |
| 781 format->palette->ncolors*sizeof(SDL_Color)); | |
| 782 convert->format->palette->ncolors = format->palette->ncolors; | |
| 783 } | |
| 784 | |
| 785 /* Save the original surface color key and alpha */ | |
| 786 surface_flags = surface->flags; | |
| 787 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 788 /* Convert colourkeyed surfaces to RGBA if requested */ | |
| 789 if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY | |
| 790 && format->Amask) { | |
| 791 surface_flags &= ~SDL_SRCCOLORKEY; | |
| 792 } else { | |
| 793 colorkey = surface->format->colorkey; | |
| 794 SDL_SetColorKey(surface, 0, 0); | |
| 795 } | |
| 796 } | |
| 797 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
|
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798 /* Copy over the alpha channel to RGBA if requested */ |
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799 if ( format->Amask ) { |
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800 surface->flags &= ~SDL_SRCALPHA; |
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801 } else { |
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802 alpha = surface->format->alpha; |
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803 SDL_SetAlpha(surface, 0, 0); |
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804 } |
| 0 | 805 } |
| 806 | |
| 807 /* Copy over the image data */ | |
| 808 bounds.x = 0; | |
| 809 bounds.y = 0; | |
| 810 bounds.w = surface->w; | |
| 811 bounds.h = surface->h; | |
| 812 SDL_LowerBlit(surface, &bounds, convert, &bounds); | |
| 813 | |
| 814 /* Clean up the original surface, and update converted surface */ | |
| 815 if ( convert != NULL ) { | |
| 816 SDL_SetClipRect(convert, &surface->clip_rect); | |
| 817 } | |
| 818 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 819 Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK); | |
| 820 if ( convert != NULL ) { | |
| 821 Uint8 keyR, keyG, keyB; | |
| 822 | |
| 823 SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB); | |
| 824 SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK), | |
| 825 SDL_MapRGB(convert->format, keyR, keyG, keyB)); | |
| 826 } | |
| 827 SDL_SetColorKey(surface, cflags, colorkey); | |
| 828 } | |
| 829 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
| 830 Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK); | |
| 831 if ( convert != NULL ) { | |
| 832 SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK), | |
| 833 alpha); | |
| 834 } | |
|
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835 if ( format->Amask ) { |
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836 surface->flags |= SDL_SRCALPHA; |
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837 } else { |
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838 SDL_SetAlpha(surface, aflags, alpha); |
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839 } |
| 0 | 840 } |
| 841 | |
| 842 /* We're ready to go! */ | |
| 843 return(convert); | |
| 844 } | |
| 845 | |
| 846 /* | |
| 847 * Free a surface created by the above function. | |
| 848 */ | |
| 849 void SDL_FreeSurface (SDL_Surface *surface) | |
| 850 { | |
| 851 /* Free anything that's not NULL, and not the screen surface */ | |
| 852 if ((surface == NULL) || | |
| 853 (current_video && | |
| 854 ((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) { | |
| 855 return; | |
| 856 } | |
| 857 if ( --surface->refcount > 0 ) { | |
| 858 return; | |
| 859 } | |
| 860 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 861 SDL_UnRLESurface(surface, 0); | |
| 862 } | |
| 863 if ( surface->format ) { | |
| 864 SDL_FreeFormat(surface->format); | |
| 865 surface->format = NULL; | |
| 866 } | |
| 867 if ( surface->map != NULL ) { | |
| 868 SDL_FreeBlitMap(surface->map); | |
| 869 surface->map = NULL; | |
| 870 } | |
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871 if ( surface->hwdata ) { |
| 0 | 872 SDL_VideoDevice *video = current_video; |
| 873 SDL_VideoDevice *this = current_video; | |
| 874 video->FreeHWSurface(this, surface); | |
| 875 } | |
| 876 if ( surface->pixels && | |
| 877 ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) { | |
| 878 free(surface->pixels); | |
| 879 } | |
| 880 free(surface); | |
| 881 #ifdef CHECK_LEAKS | |
| 882 --surfaces_allocated; | |
| 883 #endif | |
| 884 } |