Mercurial > sdl-ios-xcode
annotate src/video/SDL_surface.c @ 940:bb1588ebe47b
Date: Sat, 10 Jul 2004 21:02:33 +0200
From: "Philippe Plantier (ayin)"
Subject: [SDL] Problems allocating large surfaces
There are problems when allocating large surfaces using SDL_CreateRGBSurface.
When, for example, we try to allocate a surface wider than 16384 pixels,
the calculation of the pitch overflows; this leads to a surface that
has the w and h flags correctly set, but whose "pixels" buffer is too
small. That may lead to heap corruption.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sat, 21 Aug 2004 05:29:45 +0000 |
| parents | 01cddd0f2efb |
| children | c2f2370ac1e5 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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Updated the source with the correct e-mail address
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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 | |
|
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Date: Sat, 10 Jul 2004 21:02:33 +0200
Sam Lantinga <slouken@libsdl.org>
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55 /* Make sure the size requested doesn't overflow our datatypes */ |
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Date: Sat, 10 Jul 2004 21:02:33 +0200
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56 /* Next time I write a library like SDL, I'll use int for size. :) */ |
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Date: Sat, 10 Jul 2004 21:02:33 +0200
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57 if ( width > 16384 || height > 16384 ) { |
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bb1588ebe47b
Date: Sat, 10 Jul 2004 21:02:33 +0200
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58 SDL_SetError("Width or height is too large"); |
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Date: Sat, 10 Jul 2004 21:02:33 +0200
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59 return(NULL); |
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bb1588ebe47b
Date: Sat, 10 Jul 2004 21:02:33 +0200
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60 } |
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bb1588ebe47b
Date: Sat, 10 Jul 2004 21:02:33 +0200
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61 |
| 0 | 62 /* Check to see if we desire the surface in video memory */ |
| 63 if ( video ) { | |
| 64 screen = SDL_PublicSurface; | |
| 65 } else { | |
| 66 screen = NULL; | |
| 67 } | |
| 68 if ( screen && ((screen->flags&SDL_HWSURFACE) == SDL_HWSURFACE) ) { | |
| 69 if ( (flags&(SDL_SRCCOLORKEY|SDL_SRCALPHA)) != 0 ) { | |
| 70 flags |= SDL_HWSURFACE; | |
| 71 } | |
| 72 if ( (flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 73 if ( ! current_video->info.blit_hw_CC ) { | |
| 74 flags &= ~SDL_HWSURFACE; | |
| 75 } | |
| 76 } | |
| 77 if ( (flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
| 78 if ( ! current_video->info.blit_hw_A ) { | |
| 79 flags &= ~SDL_HWSURFACE; | |
| 80 } | |
| 81 } | |
| 82 } else { | |
| 83 flags &= ~SDL_HWSURFACE; | |
| 84 } | |
| 85 | |
| 86 /* Allocate the surface */ | |
| 87 surface = (SDL_Surface *)malloc(sizeof(*surface)); | |
| 88 if ( surface == NULL ) { | |
| 89 SDL_OutOfMemory(); | |
| 90 return(NULL); | |
| 91 } | |
| 92 surface->flags = SDL_SWSURFACE; | |
| 93 if ( (flags & SDL_HWSURFACE) == SDL_HWSURFACE ) { | |
| 94 depth = screen->format->BitsPerPixel; | |
| 95 Rmask = screen->format->Rmask; | |
| 96 Gmask = screen->format->Gmask; | |
| 97 Bmask = screen->format->Bmask; | |
| 98 Amask = screen->format->Amask; | |
| 99 } | |
| 100 surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask); | |
| 101 if ( surface->format == NULL ) { | |
| 102 free(surface); | |
| 103 return(NULL); | |
| 104 } | |
| 105 if ( Amask ) { | |
| 106 surface->flags |= SDL_SRCALPHA; | |
| 107 } | |
| 108 surface->w = width; | |
| 109 surface->h = height; | |
| 110 surface->pitch = SDL_CalculatePitch(surface); | |
| 111 surface->pixels = NULL; | |
| 112 surface->offset = 0; | |
| 113 surface->hwdata = NULL; | |
| 114 surface->locked = 0; | |
| 115 surface->map = NULL; | |
|
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Zeroed out SDL_Surface::unused1 so glSDL will work on stock SDL
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116 surface->unused1 = 0; |
| 0 | 117 SDL_SetClipRect(surface, NULL); |
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Fixed a bug in detecting surface mapping changes
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118 SDL_FormatChanged(surface); |
| 0 | 119 |
| 120 /* Get the pixels */ | |
| 121 if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) || | |
| 122 (video->AllocHWSurface(this, surface) < 0) ) { | |
| 123 if ( surface->w && surface->h ) { | |
| 124 surface->pixels = malloc(surface->h*surface->pitch); | |
| 125 if ( surface->pixels == NULL ) { | |
| 126 SDL_FreeSurface(surface); | |
| 127 SDL_OutOfMemory(); | |
| 128 return(NULL); | |
| 129 } | |
| 130 /* This is important for bitmaps */ | |
| 131 memset(surface->pixels, 0, surface->h*surface->pitch); | |
| 132 } | |
| 133 } | |
| 134 | |
| 135 /* Allocate an empty mapping */ | |
| 136 surface->map = SDL_AllocBlitMap(); | |
| 137 if ( surface->map == NULL ) { | |
| 138 SDL_FreeSurface(surface); | |
| 139 return(NULL); | |
| 140 } | |
| 141 | |
| 142 /* The surface is ready to go */ | |
| 143 surface->refcount = 1; | |
| 144 #ifdef CHECK_LEAKS | |
| 145 ++surfaces_allocated; | |
| 146 #endif | |
| 147 return(surface); | |
| 148 } | |
| 149 /* | |
| 150 * Create an RGB surface from an existing memory buffer | |
| 151 */ | |
| 152 SDL_Surface * SDL_CreateRGBSurfaceFrom (void *pixels, | |
| 153 int width, int height, int depth, int pitch, | |
| 154 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 155 { | |
| 156 SDL_Surface *surface; | |
| 157 | |
| 158 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, depth, | |
| 159 Rmask, Gmask, Bmask, Amask); | |
| 160 if ( surface != NULL ) { | |
| 161 surface->flags |= SDL_PREALLOC; | |
| 162 surface->pixels = pixels; | |
| 163 surface->w = width; | |
| 164 surface->h = height; | |
| 165 surface->pitch = pitch; | |
| 166 SDL_SetClipRect(surface, NULL); | |
| 167 } | |
| 168 return(surface); | |
| 169 } | |
| 170 /* | |
| 171 * Set the color key in a blittable surface | |
| 172 */ | |
| 173 int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key) | |
| 174 { | |
| 175 /* Sanity check the flag as it gets passed in */ | |
| 176 if ( flag & SDL_SRCCOLORKEY ) { | |
| 177 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { | |
| 178 flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK); | |
| 179 } else { | |
| 180 flag = SDL_SRCCOLORKEY; | |
| 181 } | |
| 182 } else { | |
| 183 flag = 0; | |
| 184 } | |
| 185 | |
| 186 /* Optimize away operations that don't change anything */ | |
| 187 if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) && | |
| 188 (key == surface->format->colorkey) ) { | |
| 189 return(0); | |
| 190 } | |
| 191 | |
| 192 /* UnRLE surfaces before we change the colorkey */ | |
| 193 if ( surface->flags & SDL_RLEACCEL ) { | |
| 194 SDL_UnRLESurface(surface, 1); | |
| 195 } | |
| 196 | |
| 197 if ( flag ) { | |
| 198 SDL_VideoDevice *video = current_video; | |
| 199 SDL_VideoDevice *this = current_video; | |
| 200 | |
| 201 | |
| 202 surface->flags |= SDL_SRCCOLORKEY; | |
| 203 surface->format->colorkey = key; | |
| 204 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 205 if ( (video->SetHWColorKey == NULL) || | |
| 206 (video->SetHWColorKey(this, surface, key) < 0) ) { | |
| 207 surface->flags &= ~SDL_HWACCEL; | |
| 208 } | |
| 209 } | |
| 210 if ( flag & SDL_RLEACCELOK ) { | |
| 211 surface->flags |= SDL_RLEACCELOK; | |
| 212 } else { | |
| 213 surface->flags &= ~SDL_RLEACCELOK; | |
| 214 } | |
| 215 } else { | |
| 216 surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK); | |
| 217 surface->format->colorkey = 0; | |
| 218 } | |
| 219 SDL_InvalidateMap(surface->map); | |
| 220 return(0); | |
| 221 } | |
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222 /* This function sets the alpha channel of a surface */ |
| 0 | 223 int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value) |
| 224 { | |
| 225 Uint32 oldflags = surface->flags; | |
| 226 Uint32 oldalpha = surface->format->alpha; | |
| 227 | |
| 228 /* Sanity check the flag as it gets passed in */ | |
| 229 if ( flag & SDL_SRCALPHA ) { | |
| 230 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { | |
| 231 flag = (SDL_SRCALPHA | SDL_RLEACCELOK); | |
| 232 } else { | |
| 233 flag = SDL_SRCALPHA; | |
| 234 } | |
| 235 } else { | |
| 236 flag = 0; | |
| 237 } | |
| 238 | |
| 239 /* Optimize away operations that don't change anything */ | |
| 240 if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) && | |
| 241 (!flag || value == oldalpha) ) { | |
| 242 return(0); | |
| 243 } | |
| 244 | |
| 245 if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL)) | |
| 246 SDL_UnRLESurface(surface, 1); | |
| 247 | |
| 248 if ( flag ) { | |
| 249 SDL_VideoDevice *video = current_video; | |
| 250 SDL_VideoDevice *this = current_video; | |
| 251 | |
| 252 surface->flags |= SDL_SRCALPHA; | |
| 253 surface->format->alpha = value; | |
| 254 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 255 if ( (video->SetHWAlpha == NULL) || | |
| 256 (video->SetHWAlpha(this, surface, value) < 0) ) { | |
| 257 surface->flags &= ~SDL_HWACCEL; | |
| 258 } | |
| 259 } | |
| 260 if ( flag & SDL_RLEACCELOK ) { | |
| 261 surface->flags |= SDL_RLEACCELOK; | |
| 262 } else { | |
| 263 surface->flags &= ~SDL_RLEACCELOK; | |
| 264 } | |
| 265 } else { | |
| 266 surface->flags &= ~SDL_SRCALPHA; | |
| 267 surface->format->alpha = SDL_ALPHA_OPAQUE; | |
| 268 } | |
| 269 /* | |
| 270 * The representation for software surfaces is independent of | |
| 271 * per-surface alpha, so no need to invalidate the blit mapping | |
| 272 * if just the alpha value was changed. (If either is 255, we still | |
| 273 * need to invalidate.) | |
| 274 */ | |
| 275 if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL | |
| 276 || oldflags != surface->flags | |
| 277 || (((oldalpha + 1) ^ (value + 1)) & 0x100)) | |
| 278 SDL_InvalidateMap(surface->map); | |
| 279 return(0); | |
| 280 } | |
|
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281 int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value) |
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282 { |
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283 int row, col; |
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284 int offset; |
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285 Uint8 *buf; |
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286 |
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287 if ( (surface->format->Amask != 0xFF000000) && |
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288 (surface->format->Amask != 0x000000FF) ) { |
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289 SDL_SetError("Unsupported surface alpha mask format"); |
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290 return -1; |
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291 } |
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292 |
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293 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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294 if ( surface->format->Amask == 0xFF000000 ) { |
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295 offset = 3; |
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296 } else { |
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297 offset = 0; |
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298 } |
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299 #else |
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300 if ( surface->format->Amask == 0xFF000000 ) { |
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301 offset = 0; |
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302 } else { |
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303 offset = 3; |
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304 } |
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305 #endif /* Byte ordering */ |
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306 |
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307 /* Quickly set the alpha channel of an RGBA or ARGB surface */ |
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308 if ( SDL_MUSTLOCK(surface) ) { |
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309 if ( SDL_LockSurface(surface) < 0 ) { |
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310 return -1; |
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311 } |
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312 } |
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313 row = surface->h; |
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314 while (row--) { |
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315 col = surface->w; |
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316 buf = (Uint8 *)surface->pixels + row * surface->pitch + offset; |
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317 while(col--) { |
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318 *buf = value; |
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319 buf += 4; |
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320 } |
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321 } |
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322 if ( SDL_MUSTLOCK(surface) ) { |
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323 SDL_UnlockSurface(surface); |
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324 } |
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325 return 0; |
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326 } |
| 0 | 327 |
| 328 /* | |
| 329 * A function to calculate the intersection of two rectangles: | |
| 330 * return true if the rectangles intersect, false otherwise | |
| 331 */ | |
| 332 static __inline__ | |
|
130
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333 SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection) |
| 0 | 334 { |
| 335 int Amin, Amax, Bmin, Bmax; | |
| 336 | |
| 337 /* Horizontal intersection */ | |
| 338 Amin = A->x; | |
| 339 Amax = Amin + A->w; | |
| 340 Bmin = B->x; | |
| 341 Bmax = Bmin + B->w; | |
| 342 if(Bmin > Amin) | |
| 343 Amin = Bmin; | |
| 344 intersection->x = Amin; | |
| 345 if(Bmax < Amax) | |
| 346 Amax = Bmax; | |
| 347 intersection->w = Amax - Amin > 0 ? Amax - Amin : 0; | |
| 348 | |
| 349 /* Vertical intersection */ | |
| 350 Amin = A->y; | |
| 351 Amax = Amin + A->h; | |
| 352 Bmin = B->y; | |
| 353 Bmax = Bmin + B->h; | |
| 354 if(Bmin > Amin) | |
| 355 Amin = Bmin; | |
| 356 intersection->y = Amin; | |
| 357 if(Bmax < Amax) | |
| 358 Amax = Bmax; | |
| 359 intersection->h = Amax - Amin > 0 ? Amax - Amin : 0; | |
| 360 | |
| 361 return (intersection->w && intersection->h); | |
| 362 } | |
| 363 /* | |
| 364 * Set the clipping rectangle for a blittable surface | |
| 365 */ | |
|
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366 SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect) |
| 0 | 367 { |
| 368 SDL_Rect full_rect; | |
| 369 | |
| 370 /* Don't do anything if there's no surface to act on */ | |
| 371 if ( ! surface ) { | |
| 372 return SDL_FALSE; | |
| 373 } | |
| 374 | |
| 375 /* Set up the full surface rectangle */ | |
| 376 full_rect.x = 0; | |
| 377 full_rect.y = 0; | |
| 378 full_rect.w = surface->w; | |
| 379 full_rect.h = surface->h; | |
| 380 | |
| 381 /* Set the clipping rectangle */ | |
| 382 if ( ! rect ) { | |
| 383 surface->clip_rect = full_rect; | |
| 384 return 1; | |
| 385 } | |
| 386 return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect); | |
| 387 } | |
| 388 void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect) | |
| 389 { | |
| 390 if ( surface && rect ) { | |
| 391 *rect = surface->clip_rect; | |
| 392 } | |
| 393 } | |
| 394 /* | |
| 395 * Set up a blit between two surfaces -- split into three parts: | |
| 396 * The upper part, SDL_UpperBlit(), performs clipping and rectangle | |
| 397 * verification. The lower part is a pointer to a low level | |
| 398 * accelerated blitting function. | |
| 399 * | |
| 400 * These parts are separated out and each used internally by this | |
| 401 * library in the optimimum places. They are exported so that if | |
| 402 * you know exactly what you are doing, you can optimize your code | |
| 403 * by calling the one(s) you need. | |
| 404 */ | |
| 405 int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect, | |
| 406 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 407 { | |
| 408 SDL_blit do_blit; | |
|
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409 SDL_Rect hw_srcrect; |
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410 SDL_Rect hw_dstrect; |
| 0 | 411 |
| 412 /* Check to make sure the blit mapping is valid */ | |
| 413 if ( (src->map->dst != dst) || | |
| 414 (src->map->dst->format_version != src->map->format_version) ) { | |
| 415 if ( SDL_MapSurface(src, dst) < 0 ) { | |
| 416 return(-1); | |
| 417 } | |
| 418 } | |
| 419 | |
| 420 /* Figure out which blitter to use */ | |
| 421 if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
|
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422 if ( src == SDL_VideoSurface ) { |
|
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423 hw_srcrect = *srcrect; |
|
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424 hw_srcrect.x += current_video->offset_x; |
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425 hw_srcrect.y += current_video->offset_y; |
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426 srcrect = &hw_srcrect; |
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427 } |
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428 if ( dst == SDL_VideoSurface ) { |
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429 hw_dstrect = *dstrect; |
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430 hw_dstrect.x += current_video->offset_x; |
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431 hw_dstrect.y += current_video->offset_y; |
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432 dstrect = &hw_dstrect; |
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433 } |
| 0 | 434 do_blit = src->map->hw_blit; |
| 435 } else { | |
| 436 do_blit = src->map->sw_blit; | |
| 437 } | |
| 438 return(do_blit(src, srcrect, dst, dstrect)); | |
| 439 } | |
| 440 | |
| 441 | |
| 442 int SDL_UpperBlit (SDL_Surface *src, SDL_Rect *srcrect, | |
| 443 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 444 { | |
| 445 SDL_Rect fulldst; | |
| 446 int srcx, srcy, w, h; | |
| 447 | |
| 448 /* Make sure the surfaces aren't locked */ | |
| 449 if ( ! src || ! dst ) { | |
| 450 SDL_SetError("SDL_UpperBlit: passed a NULL surface"); | |
| 451 return(-1); | |
| 452 } | |
| 453 if ( src->locked || dst->locked ) { | |
| 454 SDL_SetError("Surfaces must not be locked during blit"); | |
| 455 return(-1); | |
| 456 } | |
| 457 | |
| 458 /* If the destination rectangle is NULL, use the entire dest surface */ | |
| 459 if ( dstrect == NULL ) { | |
| 460 fulldst.x = fulldst.y = 0; | |
| 461 dstrect = &fulldst; | |
| 462 } | |
| 463 | |
| 464 /* clip the source rectangle to the source surface */ | |
| 465 if(srcrect) { | |
| 466 int maxw, maxh; | |
| 467 | |
| 468 srcx = srcrect->x; | |
| 469 w = srcrect->w; | |
| 470 if(srcx < 0) { | |
| 471 w += srcx; | |
| 472 dstrect->x -= srcx; | |
| 473 srcx = 0; | |
| 474 } | |
| 475 maxw = src->w - srcx; | |
| 476 if(maxw < w) | |
| 477 w = maxw; | |
| 478 | |
| 479 srcy = srcrect->y; | |
| 480 h = srcrect->h; | |
| 481 if(srcy < 0) { | |
| 482 h += srcy; | |
| 483 dstrect->y -= srcy; | |
| 484 srcy = 0; | |
| 485 } | |
| 486 maxh = src->h - srcy; | |
| 487 if(maxh < h) | |
| 488 h = maxh; | |
| 489 | |
| 490 } else { | |
| 491 srcx = srcy = 0; | |
| 492 w = src->w; | |
| 493 h = src->h; | |
| 494 } | |
| 495 | |
| 496 /* clip the destination rectangle against the clip rectangle */ | |
| 497 { | |
| 498 SDL_Rect *clip = &dst->clip_rect; | |
| 499 int dx, dy; | |
| 500 | |
| 501 dx = clip->x - dstrect->x; | |
| 502 if(dx > 0) { | |
| 503 w -= dx; | |
| 504 dstrect->x += dx; | |
| 505 srcx += dx; | |
| 506 } | |
| 507 dx = dstrect->x + w - clip->x - clip->w; | |
| 508 if(dx > 0) | |
| 509 w -= dx; | |
| 510 | |
| 511 dy = clip->y - dstrect->y; | |
| 512 if(dy > 0) { | |
| 513 h -= dy; | |
| 514 dstrect->y += dy; | |
| 515 srcy += dy; | |
| 516 } | |
| 517 dy = dstrect->y + h - clip->y - clip->h; | |
| 518 if(dy > 0) | |
| 519 h -= dy; | |
| 520 } | |
| 521 | |
| 522 if(w > 0 && h > 0) { | |
| 523 SDL_Rect sr; | |
| 524 sr.x = srcx; | |
| 525 sr.y = srcy; | |
| 526 sr.w = dstrect->w = w; | |
| 527 sr.h = dstrect->h = h; | |
| 528 return SDL_LowerBlit(src, &sr, dst, dstrect); | |
| 529 } | |
| 530 dstrect->w = dstrect->h = 0; | |
| 531 return 0; | |
| 532 } | |
| 533 | |
|
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534 static int SDL_FillRect1(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
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535 { |
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536 /* FIXME: We have to worry about packing order.. *sigh* */ |
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537 SDL_SetError("1-bpp rect fill not yet implemented"); |
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538 return -1; |
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539 } |
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540 |
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541 static int SDL_FillRect4(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
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542 { |
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543 /* FIXME: We have to worry about packing order.. *sigh* */ |
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544 SDL_SetError("4-bpp rect fill not yet implemented"); |
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545 return -1; |
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546 } |
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547 |
| 0 | 548 /* |
| 549 * This function performs a fast fill of the given rectangle with 'color' | |
| 550 */ | |
| 551 int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) | |
| 552 { | |
| 553 SDL_VideoDevice *video = current_video; | |
| 554 SDL_VideoDevice *this = current_video; | |
| 555 int x, y; | |
| 556 Uint8 *row; | |
| 557 | |
|
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558 /* This function doesn't work on surfaces < 8 bpp */ |
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559 if ( dst->format->BitsPerPixel < 8 ) { |
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560 switch(dst->format->BitsPerPixel) { |
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561 case 1: |
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562 return SDL_FillRect1(dst, dstrect, color); |
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563 break; |
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564 case 4: |
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565 return SDL_FillRect4(dst, dstrect, color); |
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566 break; |
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567 default: |
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568 SDL_SetError("Fill rect on unsupported surface format"); |
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569 return(-1); |
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570 break; |
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571 } |
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572 } |
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573 |
| 0 | 574 /* If 'dstrect' == NULL, then fill the whole surface */ |
| 575 if ( dstrect ) { | |
| 576 /* Perform clipping */ | |
| 577 if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) { | |
| 578 return(0); | |
| 579 } | |
| 580 } else { | |
| 581 dstrect = &dst->clip_rect; | |
| 582 } | |
| 583 | |
| 584 /* Check for hardware acceleration */ | |
| 585 if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 586 video->info.blit_fill ) { | |
|
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587 SDL_Rect hw_rect; |
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588 if ( dst == SDL_VideoSurface ) { |
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589 hw_rect = *dstrect; |
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590 hw_rect.x += current_video->offset_x; |
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591 hw_rect.y += current_video->offset_y; |
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592 dstrect = &hw_rect; |
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593 } |
| 0 | 594 return(video->FillHWRect(this, dst, dstrect, color)); |
| 595 } | |
| 596 | |
| 597 /* Perform software fill */ | |
| 598 if ( SDL_LockSurface(dst) != 0 ) { | |
| 599 return(-1); | |
| 600 } | |
| 601 row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+ | |
| 602 dstrect->x*dst->format->BytesPerPixel; | |
| 603 if ( dst->format->palette || (color == 0) ) { | |
| 604 x = dstrect->w*dst->format->BytesPerPixel; | |
| 605 if ( !color && !((long)row&3) && !(x&3) && !(dst->pitch&3) ) { | |
| 606 int n = x >> 2; | |
| 607 for ( y=dstrect->h; y; --y ) { | |
| 608 SDL_memset4(row, 0, n); | |
| 609 row += dst->pitch; | |
| 610 } | |
| 611 } else { | |
| 612 #ifdef __powerpc__ | |
| 613 /* | |
| 614 * memset() on PPC (both glibc and codewarrior) uses | |
| 615 * the dcbz (Data Cache Block Zero) instruction, which | |
| 616 * causes an alignment exception if the destination is | |
| 617 * uncachable, so only use it on software surfaces | |
| 618 */ | |
| 619 if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) { | |
| 620 if(dstrect->w >= 8) { | |
| 621 /* | |
| 622 * 64-bit stores are probably most | |
| 623 * efficient to uncached video memory | |
| 624 */ | |
| 625 double fill; | |
| 626 memset(&fill, color, (sizeof fill)); | |
| 627 for(y = dstrect->h; y; y--) { | |
| 628 Uint8 *d = row; | |
| 629 unsigned n = x; | |
| 630 unsigned nn; | |
| 631 Uint8 c = color; | |
| 632 double f = fill; | |
| 633 while((unsigned long)d | |
| 634 & (sizeof(double) - 1)) { | |
| 635 *d++ = c; | |
| 636 n--; | |
| 637 } | |
| 638 nn = n / (sizeof(double) * 4); | |
| 639 while(nn) { | |
| 640 ((double *)d)[0] = f; | |
| 641 ((double *)d)[1] = f; | |
| 642 ((double *)d)[2] = f; | |
| 643 ((double *)d)[3] = f; | |
| 644 d += 4*sizeof(double); | |
| 645 nn--; | |
| 646 } | |
| 647 n &= ~(sizeof(double) * 4 - 1); | |
| 648 nn = n / sizeof(double); | |
| 649 while(nn) { | |
| 650 *(double *)d = f; | |
| 651 d += sizeof(double); | |
| 652 nn--; | |
| 653 } | |
| 654 n &= ~(sizeof(double) - 1); | |
| 655 while(n) { | |
| 656 *d++ = c; | |
| 657 n--; | |
| 658 } | |
| 659 row += dst->pitch; | |
| 660 } | |
| 661 } else { | |
| 662 /* narrow boxes */ | |
| 663 for(y = dstrect->h; y; y--) { | |
| 664 Uint8 *d = row; | |
| 665 Uint8 c = color; | |
| 666 int n = x; | |
| 667 while(n) { | |
| 668 *d++ = c; | |
| 669 n--; | |
| 670 } | |
| 671 row += dst->pitch; | |
| 672 } | |
| 673 } | |
| 674 } else | |
| 675 #endif /* __powerpc__ */ | |
| 676 { | |
| 677 for(y = dstrect->h; y; y--) { | |
| 678 memset(row, color, x); | |
| 679 row += dst->pitch; | |
| 680 } | |
| 681 } | |
| 682 } | |
| 683 } else { | |
| 684 switch (dst->format->BytesPerPixel) { | |
| 685 case 2: | |
| 686 for ( y=dstrect->h; y; --y ) { | |
| 687 Uint16 *pixels = (Uint16 *)row; | |
| 688 Uint16 c = color; | |
| 689 Uint32 cc = (Uint32)c << 16 | c; | |
| 690 int n = dstrect->w; | |
| 691 if((unsigned long)pixels & 3) { | |
| 692 *pixels++ = c; | |
| 693 n--; | |
| 694 } | |
| 695 if(n >> 1) | |
| 696 SDL_memset4(pixels, cc, n >> 1); | |
| 697 if(n & 1) | |
| 698 pixels[n - 1] = c; | |
| 699 row += dst->pitch; | |
| 700 } | |
| 701 break; | |
| 702 | |
| 703 case 3: | |
| 704 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) | |
| 705 color <<= 8; | |
| 706 for ( y=dstrect->h; y; --y ) { | |
| 707 Uint8 *pixels = row; | |
| 708 for ( x=dstrect->w; x; --x ) { | |
| 709 memcpy(pixels, &color, 3); | |
| 710 pixels += 3; | |
| 711 } | |
| 712 row += dst->pitch; | |
| 713 } | |
| 714 break; | |
| 715 | |
| 716 case 4: | |
| 717 for(y = dstrect->h; y; --y) { | |
| 718 SDL_memset4(row, color, dstrect->w); | |
| 719 row += dst->pitch; | |
| 720 } | |
| 721 break; | |
| 722 } | |
| 723 } | |
| 724 SDL_UnlockSurface(dst); | |
| 725 | |
| 726 /* We're done! */ | |
| 727 return(0); | |
| 728 } | |
| 729 | |
| 730 /* | |
| 731 * Lock a surface to directly access the pixels | |
| 732 */ | |
| 733 int SDL_LockSurface (SDL_Surface *surface) | |
| 734 { | |
| 735 if ( ! surface->locked ) { | |
| 736 /* Perform the lock */ | |
| 737 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
| 738 SDL_VideoDevice *video = current_video; | |
| 739 SDL_VideoDevice *this = current_video; | |
| 740 if ( video->LockHWSurface(this, surface) < 0 ) { | |
| 741 return(-1); | |
| 742 } | |
| 743 } | |
| 744 if ( surface->flags & SDL_RLEACCEL ) { | |
| 745 SDL_UnRLESurface(surface, 1); | |
| 746 surface->flags |= SDL_RLEACCEL; /* save accel'd state */ | |
| 747 } | |
| 748 /* This needs to be done here in case pixels changes value */ | |
| 749 surface->pixels = (Uint8 *)surface->pixels + surface->offset; | |
| 750 } | |
| 751 | |
| 752 /* Increment the surface lock count, for recursive locks */ | |
| 753 ++surface->locked; | |
| 754 | |
| 755 /* Ready to go.. */ | |
| 756 return(0); | |
| 757 } | |
| 758 /* | |
| 759 * Unlock a previously locked surface | |
| 760 */ | |
| 761 void SDL_UnlockSurface (SDL_Surface *surface) | |
| 762 { | |
| 763 /* Only perform an unlock if we are locked */ | |
| 764 if ( ! surface->locked || (--surface->locked > 0) ) { | |
| 765 return; | |
| 766 } | |
| 767 | |
| 768 /* Perform the unlock */ | |
| 769 surface->pixels = (Uint8 *)surface->pixels - surface->offset; | |
| 770 | |
| 771 /* Unlock hardware or accelerated surfaces */ | |
| 772 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
| 773 SDL_VideoDevice *video = current_video; | |
| 774 SDL_VideoDevice *this = current_video; | |
| 775 video->UnlockHWSurface(this, surface); | |
| 776 } else { | |
| 777 /* Update RLE encoded surface with new data */ | |
| 778 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 779 surface->flags &= ~SDL_RLEACCEL; /* stop lying */ | |
| 780 SDL_RLESurface(surface); | |
| 781 } | |
| 782 } | |
| 783 } | |
| 784 | |
| 785 /* | |
| 786 * Convert a surface into the specified pixel format. | |
| 787 */ | |
| 788 SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface, | |
| 789 SDL_PixelFormat *format, Uint32 flags) | |
| 790 { | |
| 791 SDL_Surface *convert; | |
| 792 Uint32 colorkey = 0; | |
| 793 Uint8 alpha = 0; | |
| 794 Uint32 surface_flags; | |
| 795 SDL_Rect bounds; | |
| 796 | |
| 797 /* Check for empty destination palette! (results in empty image) */ | |
| 798 if ( format->palette != NULL ) { | |
| 799 int i; | |
| 800 for ( i=0; i<format->palette->ncolors; ++i ) { | |
| 801 if ( (format->palette->colors[i].r != 0) || | |
| 802 (format->palette->colors[i].g != 0) || | |
| 803 (format->palette->colors[i].b != 0) ) | |
| 804 break; | |
| 805 } | |
| 806 if ( i == format->palette->ncolors ) { | |
| 807 SDL_SetError("Empty destination palette"); | |
| 808 return(NULL); | |
| 809 } | |
| 810 } | |
| 811 | |
|
264
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812 /* Only create hw surfaces with alpha channel if hw alpha blits |
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813 are supported */ |
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814 if(format->Amask != 0 && (flags & SDL_HWSURFACE)) { |
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815 const SDL_VideoInfo *vi = SDL_GetVideoInfo(); |
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816 if(!vi || !vi->blit_hw_A) |
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817 flags &= ~SDL_HWSURFACE; |
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818 } |
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819 |
| 0 | 820 /* Create a new surface with the desired format */ |
| 821 convert = SDL_CreateRGBSurface(flags, | |
| 822 surface->w, surface->h, format->BitsPerPixel, | |
| 823 format->Rmask, format->Gmask, format->Bmask, format->Amask); | |
| 824 if ( convert == NULL ) { | |
| 825 return(NULL); | |
| 826 } | |
| 827 | |
| 828 /* Copy the palette if any */ | |
| 829 if ( format->palette && convert->format->palette ) { | |
| 830 memcpy(convert->format->palette->colors, | |
| 831 format->palette->colors, | |
| 832 format->palette->ncolors*sizeof(SDL_Color)); | |
| 833 convert->format->palette->ncolors = format->palette->ncolors; | |
| 834 } | |
| 835 | |
| 836 /* Save the original surface color key and alpha */ | |
| 837 surface_flags = surface->flags; | |
| 838 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 839 /* Convert colourkeyed surfaces to RGBA if requested */ | |
| 840 if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY | |
| 841 && format->Amask) { | |
| 842 surface_flags &= ~SDL_SRCCOLORKEY; | |
| 843 } else { | |
| 844 colorkey = surface->format->colorkey; | |
| 845 SDL_SetColorKey(surface, 0, 0); | |
| 846 } | |
| 847 } | |
| 848 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
|
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849 /* Copy over the alpha channel to RGBA if requested */ |
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850 if ( format->Amask ) { |
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851 surface->flags &= ~SDL_SRCALPHA; |
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852 } else { |
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853 alpha = surface->format->alpha; |
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854 SDL_SetAlpha(surface, 0, 0); |
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855 } |
| 0 | 856 } |
| 857 | |
| 858 /* Copy over the image data */ | |
| 859 bounds.x = 0; | |
| 860 bounds.y = 0; | |
| 861 bounds.w = surface->w; | |
| 862 bounds.h = surface->h; | |
| 863 SDL_LowerBlit(surface, &bounds, convert, &bounds); | |
| 864 | |
| 865 /* Clean up the original surface, and update converted surface */ | |
| 866 if ( convert != NULL ) { | |
| 867 SDL_SetClipRect(convert, &surface->clip_rect); | |
| 868 } | |
| 869 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 870 Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK); | |
| 871 if ( convert != NULL ) { | |
| 872 Uint8 keyR, keyG, keyB; | |
| 873 | |
| 874 SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB); | |
| 875 SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK), | |
| 876 SDL_MapRGB(convert->format, keyR, keyG, keyB)); | |
| 877 } | |
| 878 SDL_SetColorKey(surface, cflags, colorkey); | |
| 879 } | |
| 880 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
| 881 Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK); | |
| 882 if ( convert != NULL ) { | |
| 883 SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK), | |
| 884 alpha); | |
| 885 } | |
|
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886 if ( format->Amask ) { |
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887 surface->flags |= SDL_SRCALPHA; |
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888 } else { |
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889 SDL_SetAlpha(surface, aflags, alpha); |
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890 } |
| 0 | 891 } |
| 892 | |
| 893 /* We're ready to go! */ | |
| 894 return(convert); | |
| 895 } | |
| 896 | |
| 897 /* | |
| 898 * Free a surface created by the above function. | |
| 899 */ | |
| 900 void SDL_FreeSurface (SDL_Surface *surface) | |
| 901 { | |
| 902 /* Free anything that's not NULL, and not the screen surface */ | |
| 903 if ((surface == NULL) || | |
| 904 (current_video && | |
| 905 ((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) { | |
| 906 return; | |
| 907 } | |
| 908 if ( --surface->refcount > 0 ) { | |
| 909 return; | |
| 910 } | |
|
915
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911 while ( surface->locked > 0 ) { |
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912 SDL_UnlockSurface(surface); |
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913 } |
| 0 | 914 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { |
| 915 SDL_UnRLESurface(surface, 0); | |
| 916 } | |
| 917 if ( surface->format ) { | |
| 918 SDL_FreeFormat(surface->format); | |
| 919 surface->format = NULL; | |
| 920 } | |
| 921 if ( surface->map != NULL ) { | |
| 922 SDL_FreeBlitMap(surface->map); | |
| 923 surface->map = NULL; | |
| 924 } | |
|
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925 if ( surface->hwdata ) { |
| 0 | 926 SDL_VideoDevice *video = current_video; |
| 927 SDL_VideoDevice *this = current_video; | |
| 928 video->FreeHWSurface(this, surface); | |
| 929 } | |
| 930 if ( surface->pixels && | |
| 931 ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) { | |
| 932 free(surface->pixels); | |
| 933 } | |
| 934 free(surface); | |
| 935 #ifdef CHECK_LEAKS | |
| 936 --surfaces_allocated; | |
| 937 #endif | |
| 938 } |