Mercurial > sdl-ios-xcode
annotate src/video/SDL_surface.c @ 1402:d910939febfa
Use consistent identifiers for the various platforms we support.
Make sure every source file includes SDL_config.h, so the proper system
headers are chosen.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 21 Feb 2006 08:46:50 +0000 |
| parents | c71e05b4dc2e |
| children | 5f52867ba65c |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
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6 modify it under the terms of the GNU Lesser General Public |
| 0 | 7 License as published by the Free Software Foundation; either |
|
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8 version 2.1 of the License, or (at your option) any later version. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
|
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13 Lesser General Public License for more details. |
| 0 | 14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
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22 #include "SDL_config.h" |
| 0 | 23 |
| 24 #include "SDL_video.h" | |
| 25 #include "SDL_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 | |
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32 |
| 0 | 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 | |
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46 /* Make sure the size requested doesn't overflow our datatypes */ |
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47 /* Next time I write a library like SDL, I'll use int for size. :) */ |
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48 if ( width >= 16384 || height >= 65536 ) { |
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49 SDL_SetError("Width or height is too large"); |
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50 return(NULL); |
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51 } |
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52 |
| 0 | 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 */ | |
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78 surface = (SDL_Surface *)SDL_malloc(sizeof(*surface)); |
| 0 | 79 if ( surface == NULL ) { |
| 80 SDL_OutOfMemory(); | |
| 81 return(NULL); | |
| 82 } | |
| 83 surface->flags = SDL_SWSURFACE; | |
| 84 if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
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85 if ((Amask) && (video->displayformatalphapixel)) |
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86 { |
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87 depth = video->displayformatalphapixel->BitsPerPixel; |
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88 Rmask = video->displayformatalphapixel->Rmask; |
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89 Gmask = video->displayformatalphapixel->Gmask; |
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90 Bmask = video->displayformatalphapixel->Bmask; |
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91 Amask = video->displayformatalphapixel->Amask; |
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92 } |
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93 else |
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94 { |
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95 depth = screen->format->BitsPerPixel; |
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96 Rmask = screen->format->Rmask; |
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97 Gmask = screen->format->Gmask; |
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98 Bmask = screen->format->Bmask; |
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99 Amask = screen->format->Amask; |
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100 } |
| 0 | 101 } |
| 102 surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask); | |
| 103 if ( surface->format == NULL ) { | |
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104 SDL_free(surface); |
| 0 | 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; | |
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118 surface->unused1 = 0; |
| 0 | 119 SDL_SetClipRect(surface, NULL); |
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120 SDL_FormatChanged(surface); |
| 0 | 121 |
| 122 /* Get the pixels */ | |
| 123 if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) || | |
| 124 (video->AllocHWSurface(this, surface) < 0) ) { | |
| 125 if ( surface->w && surface->h ) { | |
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126 surface->pixels = SDL_malloc(surface->h*surface->pitch); |
| 0 | 127 if ( surface->pixels == NULL ) { |
| 128 SDL_FreeSurface(surface); | |
| 129 SDL_OutOfMemory(); | |
| 130 return(NULL); | |
| 131 } | |
| 132 /* This is important for bitmaps */ | |
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133 SDL_memset(surface->pixels, 0, surface->h*surface->pitch); |
| 0 | 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 } | |
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224 /* This function sets the alpha channel of a surface */ |
| 0 | 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 } | |
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283 int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value) |
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284 { |
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285 int row, col; |
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286 int offset; |
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287 Uint8 *buf; |
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288 |
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289 if ( (surface->format->Amask != 0xFF000000) && |
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290 (surface->format->Amask != 0x000000FF) ) { |
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291 SDL_SetError("Unsupported surface alpha mask format"); |
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292 return -1; |
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293 } |
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294 |
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295 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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296 if ( surface->format->Amask == 0xFF000000 ) { |
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297 offset = 3; |
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298 } else { |
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299 offset = 0; |
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300 } |
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301 #else |
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302 if ( surface->format->Amask == 0xFF000000 ) { |
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303 offset = 0; |
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304 } else { |
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305 offset = 3; |
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306 } |
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307 #endif /* Byte ordering */ |
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308 |
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309 /* Quickly set the alpha channel of an RGBA or ARGB surface */ |
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310 if ( SDL_MUSTLOCK(surface) ) { |
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311 if ( SDL_LockSurface(surface) < 0 ) { |
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312 return -1; |
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313 } |
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314 } |
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315 row = surface->h; |
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316 while (row--) { |
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317 col = surface->w; |
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318 buf = (Uint8 *)surface->pixels + row * surface->pitch + offset; |
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319 while(col--) { |
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320 *buf = value; |
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321 buf += 4; |
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322 } |
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323 } |
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324 if ( SDL_MUSTLOCK(surface) ) { |
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325 SDL_UnlockSurface(surface); |
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326 } |
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327 return 0; |
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328 } |
| 0 | 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__ | |
|
130
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335 SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection) |
| 0 | 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 */ | |
|
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368 SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect) |
| 0 | 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; | |
|
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411 SDL_Rect hw_srcrect; |
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412 SDL_Rect hw_dstrect; |
| 0 | 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 ) { | |
|
462
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424 if ( src == SDL_VideoSurface ) { |
|
519
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425 hw_srcrect = *srcrect; |
|
462
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426 hw_srcrect.x += current_video->offset_x; |
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427 hw_srcrect.y += current_video->offset_y; |
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428 srcrect = &hw_srcrect; |
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429 } |
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430 if ( dst == SDL_VideoSurface ) { |
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431 hw_dstrect = *dstrect; |
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432 hw_dstrect.x += current_video->offset_x; |
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433 hw_dstrect.y += current_video->offset_y; |
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434 dstrect = &hw_dstrect; |
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435 } |
| 0 | 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 | |
|
532
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536 static int SDL_FillRect1(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
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537 { |
|
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538 /* FIXME: We have to worry about packing order.. *sigh* */ |
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539 SDL_SetError("1-bpp rect fill not yet implemented"); |
|
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540 return -1; |
|
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|
541 } |
|
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|
542 |
|
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543 static int SDL_FillRect4(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
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544 { |
|
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545 /* FIXME: We have to worry about packing order.. *sigh* */ |
|
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546 SDL_SetError("4-bpp rect fill not yet implemented"); |
|
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547 return -1; |
|
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|
548 } |
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549 |
| 0 | 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 | |
|
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560 /* This function doesn't work on surfaces < 8 bpp */ |
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561 if ( dst->format->BitsPerPixel < 8 ) { |
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562 switch(dst->format->BitsPerPixel) { |
|
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|
563 case 1: |
|
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564 return SDL_FillRect1(dst, dstrect, color); |
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565 break; |
|
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566 case 4: |
|
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567 return SDL_FillRect4(dst, dstrect, color); |
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568 break; |
|
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569 default: |
|
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570 SDL_SetError("Fill rect on unsupported surface format"); |
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571 return(-1); |
|
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572 break; |
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573 } |
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574 } |
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575 |
| 0 | 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 ) { | |
|
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589 SDL_Rect hw_rect; |
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590 if ( dst == SDL_VideoSurface ) { |
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591 hw_rect = *dstrect; |
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592 hw_rect.x += current_video->offset_x; |
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593 hw_rect.y += current_video->offset_y; |
|
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594 dstrect = &hw_rect; |
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595 } |
| 0 | 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 && !((long)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 /* | |
|
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616 * SDL_memset() on PPC (both glibc and codewarrior) uses |
| 0 | 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; | |
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628 SDL_memset(&fill, color, (sizeof fill)); |
| 0 | 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--) { | |
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680 SDL_memset(row, color, x); |
| 0 | 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 = color; | |
| 691 Uint32 cc = (Uint32)c << 16 | c; | |
| 692 int n = dstrect->w; | |
| 693 if((unsigned long)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: | |
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706 #if SDL_BYTEORDER == SDL_BIG_ENDIAN |
| 0 | 707 color <<= 8; |
|
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708 #endif |
| 0 | 709 for ( y=dstrect->h; y; --y ) { |
| 710 Uint8 *pixels = row; | |
| 711 for ( x=dstrect->w; x; --x ) { | |
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712 SDL_memcpy(pixels, &color, 3); |
| 0 | 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 | |
|
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815 /* Only create hw surfaces with alpha channel if hw alpha blits |
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816 are supported */ |
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817 if(format->Amask != 0 && (flags & SDL_HWSURFACE)) { |
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818 const SDL_VideoInfo *vi = SDL_GetVideoInfo(); |
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819 if(!vi || !vi->blit_hw_A) |
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820 flags &= ~SDL_HWSURFACE; |
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821 } |
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822 |
| 0 | 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 ) { | |
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833 SDL_memcpy(convert->format->palette->colors, |
| 0 | 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 ) { | |
|
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Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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852 /* Copy over the alpha channel to RGBA if requested */ |
|
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Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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853 if ( format->Amask ) { |
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854 surface->flags &= ~SDL_SRCALPHA; |
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855 } else { |
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856 alpha = surface->format->alpha; |
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857 SDL_SetAlpha(surface, 0, 0); |
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858 } |
| 0 | 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 } | |
|
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Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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889 if ( format->Amask ) { |
|
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Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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890 surface->flags |= SDL_SRCALPHA; |
|
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Fixed SDL_DisplayFormatAlpha() on RGB surfaces with alpha
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891 } else { |
|
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892 SDL_SetAlpha(surface, aflags, alpha); |
|
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893 } |
| 0 | 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 } | |
|
915
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914 while ( surface->locked > 0 ) { |
|
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915 SDL_UnlockSurface(surface); |
|
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916 } |
| 0 | 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 } | |
|
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928 if ( surface->hwdata ) { |
| 0 | 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) ) { | |
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935 SDL_free(surface->pixels); |
| 0 | 936 } |
|
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937 SDL_free(surface); |
| 0 | 938 #ifdef CHECK_LEAKS |
| 939 --surfaces_allocated; | |
| 940 #endif | |
| 941 } |