Mercurial > sdl-ios-xcode
annotate src/video/SDL_surface.c @ 1052:68f607298ca9
Some work on using accelerated alpha blits with hardware surfaces.
From Stephane Marchesin's fork, don't know who originally wrote it.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sun, 17 Apr 2005 10:40:41 +0000 |
| parents | c2f2370ac1e5 |
| children | 91569ec25acd |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2004 (Happy New Year!)
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3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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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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55 /* Make sure the size requested doesn't overflow our datatypes */ |
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56 /* Next time I write a library like SDL, I'll use int for size. :) */ |
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57 if ( width >= 16384 || height >= 65536 ) { |
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58 SDL_SetError("Width or height is too large"); |
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59 return(NULL); |
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60 } |
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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 ) { | |
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94 if ((Amask) && (video->displayformatalphapixel)) |
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95 { |
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96 depth = video->displayformatalphapixel->BitsPerPixel; |
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97 Rmask = video->displayformatalphapixel->Rmask; |
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98 Gmask = video->displayformatalphapixel->Gmask; |
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99 Bmask = video->displayformatalphapixel->Bmask; |
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100 Amask = video->displayformatalphapixel->Amask; |
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101 } |
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102 else |
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103 { |
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104 depth = screen->format->BitsPerPixel; |
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105 Rmask = screen->format->Rmask; |
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106 Gmask = screen->format->Gmask; |
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107 Bmask = screen->format->Bmask; |
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108 Amask = screen->format->Amask; |
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109 } |
| 0 | 110 } |
| 111 surface->format = SDL_AllocFormat(depth, Rmask, Gmask, Bmask, Amask); | |
| 112 if ( surface->format == NULL ) { | |
| 113 free(surface); | |
| 114 return(NULL); | |
| 115 } | |
| 116 if ( Amask ) { | |
| 117 surface->flags |= SDL_SRCALPHA; | |
| 118 } | |
| 119 surface->w = width; | |
| 120 surface->h = height; | |
| 121 surface->pitch = SDL_CalculatePitch(surface); | |
| 122 surface->pixels = NULL; | |
| 123 surface->offset = 0; | |
| 124 surface->hwdata = NULL; | |
| 125 surface->locked = 0; | |
| 126 surface->map = NULL; | |
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127 surface->unused1 = 0; |
| 0 | 128 SDL_SetClipRect(surface, NULL); |
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129 SDL_FormatChanged(surface); |
| 0 | 130 |
| 131 /* Get the pixels */ | |
| 132 if ( ((flags&SDL_HWSURFACE) == SDL_SWSURFACE) || | |
| 133 (video->AllocHWSurface(this, surface) < 0) ) { | |
| 134 if ( surface->w && surface->h ) { | |
| 135 surface->pixels = malloc(surface->h*surface->pitch); | |
| 136 if ( surface->pixels == NULL ) { | |
| 137 SDL_FreeSurface(surface); | |
| 138 SDL_OutOfMemory(); | |
| 139 return(NULL); | |
| 140 } | |
| 141 /* This is important for bitmaps */ | |
| 142 memset(surface->pixels, 0, surface->h*surface->pitch); | |
| 143 } | |
| 144 } | |
| 145 | |
| 146 /* Allocate an empty mapping */ | |
| 147 surface->map = SDL_AllocBlitMap(); | |
| 148 if ( surface->map == NULL ) { | |
| 149 SDL_FreeSurface(surface); | |
| 150 return(NULL); | |
| 151 } | |
| 152 | |
| 153 /* The surface is ready to go */ | |
| 154 surface->refcount = 1; | |
| 155 #ifdef CHECK_LEAKS | |
| 156 ++surfaces_allocated; | |
| 157 #endif | |
| 158 return(surface); | |
| 159 } | |
| 160 /* | |
| 161 * Create an RGB surface from an existing memory buffer | |
| 162 */ | |
| 163 SDL_Surface * SDL_CreateRGBSurfaceFrom (void *pixels, | |
| 164 int width, int height, int depth, int pitch, | |
| 165 Uint32 Rmask, Uint32 Gmask, Uint32 Bmask, Uint32 Amask) | |
| 166 { | |
| 167 SDL_Surface *surface; | |
| 168 | |
| 169 surface = SDL_CreateRGBSurface(SDL_SWSURFACE, 0, 0, depth, | |
| 170 Rmask, Gmask, Bmask, Amask); | |
| 171 if ( surface != NULL ) { | |
| 172 surface->flags |= SDL_PREALLOC; | |
| 173 surface->pixels = pixels; | |
| 174 surface->w = width; | |
| 175 surface->h = height; | |
| 176 surface->pitch = pitch; | |
| 177 SDL_SetClipRect(surface, NULL); | |
| 178 } | |
| 179 return(surface); | |
| 180 } | |
| 181 /* | |
| 182 * Set the color key in a blittable surface | |
| 183 */ | |
| 184 int SDL_SetColorKey (SDL_Surface *surface, Uint32 flag, Uint32 key) | |
| 185 { | |
| 186 /* Sanity check the flag as it gets passed in */ | |
| 187 if ( flag & SDL_SRCCOLORKEY ) { | |
| 188 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { | |
| 189 flag = (SDL_SRCCOLORKEY | SDL_RLEACCELOK); | |
| 190 } else { | |
| 191 flag = SDL_SRCCOLORKEY; | |
| 192 } | |
| 193 } else { | |
| 194 flag = 0; | |
| 195 } | |
| 196 | |
| 197 /* Optimize away operations that don't change anything */ | |
| 198 if ( (flag == (surface->flags & (SDL_SRCCOLORKEY|SDL_RLEACCELOK))) && | |
| 199 (key == surface->format->colorkey) ) { | |
| 200 return(0); | |
| 201 } | |
| 202 | |
| 203 /* UnRLE surfaces before we change the colorkey */ | |
| 204 if ( surface->flags & SDL_RLEACCEL ) { | |
| 205 SDL_UnRLESurface(surface, 1); | |
| 206 } | |
| 207 | |
| 208 if ( flag ) { | |
| 209 SDL_VideoDevice *video = current_video; | |
| 210 SDL_VideoDevice *this = current_video; | |
| 211 | |
| 212 | |
| 213 surface->flags |= SDL_SRCCOLORKEY; | |
| 214 surface->format->colorkey = key; | |
| 215 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 216 if ( (video->SetHWColorKey == NULL) || | |
| 217 (video->SetHWColorKey(this, surface, key) < 0) ) { | |
| 218 surface->flags &= ~SDL_HWACCEL; | |
| 219 } | |
| 220 } | |
| 221 if ( flag & SDL_RLEACCELOK ) { | |
| 222 surface->flags |= SDL_RLEACCELOK; | |
| 223 } else { | |
| 224 surface->flags &= ~SDL_RLEACCELOK; | |
| 225 } | |
| 226 } else { | |
| 227 surface->flags &= ~(SDL_SRCCOLORKEY|SDL_RLEACCELOK); | |
| 228 surface->format->colorkey = 0; | |
| 229 } | |
| 230 SDL_InvalidateMap(surface->map); | |
| 231 return(0); | |
| 232 } | |
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233 /* This function sets the alpha channel of a surface */ |
| 0 | 234 int SDL_SetAlpha (SDL_Surface *surface, Uint32 flag, Uint8 value) |
| 235 { | |
| 236 Uint32 oldflags = surface->flags; | |
| 237 Uint32 oldalpha = surface->format->alpha; | |
| 238 | |
| 239 /* Sanity check the flag as it gets passed in */ | |
| 240 if ( flag & SDL_SRCALPHA ) { | |
| 241 if ( flag & (SDL_RLEACCEL|SDL_RLEACCELOK) ) { | |
| 242 flag = (SDL_SRCALPHA | SDL_RLEACCELOK); | |
| 243 } else { | |
| 244 flag = SDL_SRCALPHA; | |
| 245 } | |
| 246 } else { | |
| 247 flag = 0; | |
| 248 } | |
| 249 | |
| 250 /* Optimize away operations that don't change anything */ | |
| 251 if ( (flag == (surface->flags & (SDL_SRCALPHA|SDL_RLEACCELOK))) && | |
| 252 (!flag || value == oldalpha) ) { | |
| 253 return(0); | |
| 254 } | |
| 255 | |
| 256 if(!(flag & SDL_RLEACCELOK) && (surface->flags & SDL_RLEACCEL)) | |
| 257 SDL_UnRLESurface(surface, 1); | |
| 258 | |
| 259 if ( flag ) { | |
| 260 SDL_VideoDevice *video = current_video; | |
| 261 SDL_VideoDevice *this = current_video; | |
| 262 | |
| 263 surface->flags |= SDL_SRCALPHA; | |
| 264 surface->format->alpha = value; | |
| 265 if ( (surface->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
| 266 if ( (video->SetHWAlpha == NULL) || | |
| 267 (video->SetHWAlpha(this, surface, value) < 0) ) { | |
| 268 surface->flags &= ~SDL_HWACCEL; | |
| 269 } | |
| 270 } | |
| 271 if ( flag & SDL_RLEACCELOK ) { | |
| 272 surface->flags |= SDL_RLEACCELOK; | |
| 273 } else { | |
| 274 surface->flags &= ~SDL_RLEACCELOK; | |
| 275 } | |
| 276 } else { | |
| 277 surface->flags &= ~SDL_SRCALPHA; | |
| 278 surface->format->alpha = SDL_ALPHA_OPAQUE; | |
| 279 } | |
| 280 /* | |
| 281 * The representation for software surfaces is independent of | |
| 282 * per-surface alpha, so no need to invalidate the blit mapping | |
| 283 * if just the alpha value was changed. (If either is 255, we still | |
| 284 * need to invalidate.) | |
| 285 */ | |
| 286 if((surface->flags & SDL_HWACCEL) == SDL_HWACCEL | |
| 287 || oldflags != surface->flags | |
| 288 || (((oldalpha + 1) ^ (value + 1)) & 0x100)) | |
| 289 SDL_InvalidateMap(surface->map); | |
| 290 return(0); | |
| 291 } | |
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292 int SDL_SetAlphaChannel(SDL_Surface *surface, Uint8 value) |
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293 { |
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294 int row, col; |
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295 int offset; |
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296 Uint8 *buf; |
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297 |
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298 if ( (surface->format->Amask != 0xFF000000) && |
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299 (surface->format->Amask != 0x000000FF) ) { |
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300 SDL_SetError("Unsupported surface alpha mask format"); |
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301 return -1; |
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302 } |
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303 |
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304 #if SDL_BYTEORDER == SDL_LIL_ENDIAN |
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305 if ( surface->format->Amask == 0xFF000000 ) { |
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306 offset = 3; |
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307 } else { |
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308 offset = 0; |
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309 } |
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310 #else |
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311 if ( surface->format->Amask == 0xFF000000 ) { |
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312 offset = 0; |
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313 } else { |
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314 offset = 3; |
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315 } |
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316 #endif /* Byte ordering */ |
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317 |
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318 /* Quickly set the alpha channel of an RGBA or ARGB surface */ |
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319 if ( SDL_MUSTLOCK(surface) ) { |
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320 if ( SDL_LockSurface(surface) < 0 ) { |
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321 return -1; |
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322 } |
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323 } |
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324 row = surface->h; |
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325 while (row--) { |
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326 col = surface->w; |
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327 buf = (Uint8 *)surface->pixels + row * surface->pitch + offset; |
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328 while(col--) { |
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329 *buf = value; |
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330 buf += 4; |
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331 } |
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332 } |
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333 if ( SDL_MUSTLOCK(surface) ) { |
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334 SDL_UnlockSurface(surface); |
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335 } |
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336 return 0; |
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337 } |
| 0 | 338 |
| 339 /* | |
| 340 * A function to calculate the intersection of two rectangles: | |
| 341 * return true if the rectangles intersect, false otherwise | |
| 342 */ | |
| 343 static __inline__ | |
|
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344 SDL_bool SDL_IntersectRect(const SDL_Rect *A, const SDL_Rect *B, SDL_Rect *intersection) |
| 0 | 345 { |
| 346 int Amin, Amax, Bmin, Bmax; | |
| 347 | |
| 348 /* Horizontal intersection */ | |
| 349 Amin = A->x; | |
| 350 Amax = Amin + A->w; | |
| 351 Bmin = B->x; | |
| 352 Bmax = Bmin + B->w; | |
| 353 if(Bmin > Amin) | |
| 354 Amin = Bmin; | |
| 355 intersection->x = Amin; | |
| 356 if(Bmax < Amax) | |
| 357 Amax = Bmax; | |
| 358 intersection->w = Amax - Amin > 0 ? Amax - Amin : 0; | |
| 359 | |
| 360 /* Vertical intersection */ | |
| 361 Amin = A->y; | |
| 362 Amax = Amin + A->h; | |
| 363 Bmin = B->y; | |
| 364 Bmax = Bmin + B->h; | |
| 365 if(Bmin > Amin) | |
| 366 Amin = Bmin; | |
| 367 intersection->y = Amin; | |
| 368 if(Bmax < Amax) | |
| 369 Amax = Bmax; | |
| 370 intersection->h = Amax - Amin > 0 ? Amax - Amin : 0; | |
| 371 | |
| 372 return (intersection->w && intersection->h); | |
| 373 } | |
| 374 /* | |
| 375 * Set the clipping rectangle for a blittable surface | |
| 376 */ | |
|
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377 SDL_bool SDL_SetClipRect(SDL_Surface *surface, const SDL_Rect *rect) |
| 0 | 378 { |
| 379 SDL_Rect full_rect; | |
| 380 | |
| 381 /* Don't do anything if there's no surface to act on */ | |
| 382 if ( ! surface ) { | |
| 383 return SDL_FALSE; | |
| 384 } | |
| 385 | |
| 386 /* Set up the full surface rectangle */ | |
| 387 full_rect.x = 0; | |
| 388 full_rect.y = 0; | |
| 389 full_rect.w = surface->w; | |
| 390 full_rect.h = surface->h; | |
| 391 | |
| 392 /* Set the clipping rectangle */ | |
| 393 if ( ! rect ) { | |
| 394 surface->clip_rect = full_rect; | |
| 395 return 1; | |
| 396 } | |
| 397 return SDL_IntersectRect(rect, &full_rect, &surface->clip_rect); | |
| 398 } | |
| 399 void SDL_GetClipRect(SDL_Surface *surface, SDL_Rect *rect) | |
| 400 { | |
| 401 if ( surface && rect ) { | |
| 402 *rect = surface->clip_rect; | |
| 403 } | |
| 404 } | |
| 405 /* | |
| 406 * Set up a blit between two surfaces -- split into three parts: | |
| 407 * The upper part, SDL_UpperBlit(), performs clipping and rectangle | |
| 408 * verification. The lower part is a pointer to a low level | |
| 409 * accelerated blitting function. | |
| 410 * | |
| 411 * These parts are separated out and each used internally by this | |
| 412 * library in the optimimum places. They are exported so that if | |
| 413 * you know exactly what you are doing, you can optimize your code | |
| 414 * by calling the one(s) you need. | |
| 415 */ | |
| 416 int SDL_LowerBlit (SDL_Surface *src, SDL_Rect *srcrect, | |
| 417 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 418 { | |
| 419 SDL_blit do_blit; | |
|
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420 SDL_Rect hw_srcrect; |
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421 SDL_Rect hw_dstrect; |
| 0 | 422 |
| 423 /* Check to make sure the blit mapping is valid */ | |
| 424 if ( (src->map->dst != dst) || | |
| 425 (src->map->dst->format_version != src->map->format_version) ) { | |
| 426 if ( SDL_MapSurface(src, dst) < 0 ) { | |
| 427 return(-1); | |
| 428 } | |
| 429 } | |
| 430 | |
| 431 /* Figure out which blitter to use */ | |
| 432 if ( (src->flags & SDL_HWACCEL) == SDL_HWACCEL ) { | |
|
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433 if ( src == SDL_VideoSurface ) { |
|
519
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434 hw_srcrect = *srcrect; |
|
462
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435 hw_srcrect.x += current_video->offset_x; |
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436 hw_srcrect.y += current_video->offset_y; |
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437 srcrect = &hw_srcrect; |
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438 } |
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439 if ( dst == SDL_VideoSurface ) { |
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440 hw_dstrect = *dstrect; |
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441 hw_dstrect.x += current_video->offset_x; |
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442 hw_dstrect.y += current_video->offset_y; |
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443 dstrect = &hw_dstrect; |
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444 } |
| 0 | 445 do_blit = src->map->hw_blit; |
| 446 } else { | |
| 447 do_blit = src->map->sw_blit; | |
| 448 } | |
| 449 return(do_blit(src, srcrect, dst, dstrect)); | |
| 450 } | |
| 451 | |
| 452 | |
| 453 int SDL_UpperBlit (SDL_Surface *src, SDL_Rect *srcrect, | |
| 454 SDL_Surface *dst, SDL_Rect *dstrect) | |
| 455 { | |
| 456 SDL_Rect fulldst; | |
| 457 int srcx, srcy, w, h; | |
| 458 | |
| 459 /* Make sure the surfaces aren't locked */ | |
| 460 if ( ! src || ! dst ) { | |
| 461 SDL_SetError("SDL_UpperBlit: passed a NULL surface"); | |
| 462 return(-1); | |
| 463 } | |
| 464 if ( src->locked || dst->locked ) { | |
| 465 SDL_SetError("Surfaces must not be locked during blit"); | |
| 466 return(-1); | |
| 467 } | |
| 468 | |
| 469 /* If the destination rectangle is NULL, use the entire dest surface */ | |
| 470 if ( dstrect == NULL ) { | |
| 471 fulldst.x = fulldst.y = 0; | |
| 472 dstrect = &fulldst; | |
| 473 } | |
| 474 | |
| 475 /* clip the source rectangle to the source surface */ | |
| 476 if(srcrect) { | |
| 477 int maxw, maxh; | |
| 478 | |
| 479 srcx = srcrect->x; | |
| 480 w = srcrect->w; | |
| 481 if(srcx < 0) { | |
| 482 w += srcx; | |
| 483 dstrect->x -= srcx; | |
| 484 srcx = 0; | |
| 485 } | |
| 486 maxw = src->w - srcx; | |
| 487 if(maxw < w) | |
| 488 w = maxw; | |
| 489 | |
| 490 srcy = srcrect->y; | |
| 491 h = srcrect->h; | |
| 492 if(srcy < 0) { | |
| 493 h += srcy; | |
| 494 dstrect->y -= srcy; | |
| 495 srcy = 0; | |
| 496 } | |
| 497 maxh = src->h - srcy; | |
| 498 if(maxh < h) | |
| 499 h = maxh; | |
| 500 | |
| 501 } else { | |
| 502 srcx = srcy = 0; | |
| 503 w = src->w; | |
| 504 h = src->h; | |
| 505 } | |
| 506 | |
| 507 /* clip the destination rectangle against the clip rectangle */ | |
| 508 { | |
| 509 SDL_Rect *clip = &dst->clip_rect; | |
| 510 int dx, dy; | |
| 511 | |
| 512 dx = clip->x - dstrect->x; | |
| 513 if(dx > 0) { | |
| 514 w -= dx; | |
| 515 dstrect->x += dx; | |
| 516 srcx += dx; | |
| 517 } | |
| 518 dx = dstrect->x + w - clip->x - clip->w; | |
| 519 if(dx > 0) | |
| 520 w -= dx; | |
| 521 | |
| 522 dy = clip->y - dstrect->y; | |
| 523 if(dy > 0) { | |
| 524 h -= dy; | |
| 525 dstrect->y += dy; | |
| 526 srcy += dy; | |
| 527 } | |
| 528 dy = dstrect->y + h - clip->y - clip->h; | |
| 529 if(dy > 0) | |
| 530 h -= dy; | |
| 531 } | |
| 532 | |
| 533 if(w > 0 && h > 0) { | |
| 534 SDL_Rect sr; | |
| 535 sr.x = srcx; | |
| 536 sr.y = srcy; | |
| 537 sr.w = dstrect->w = w; | |
| 538 sr.h = dstrect->h = h; | |
| 539 return SDL_LowerBlit(src, &sr, dst, dstrect); | |
| 540 } | |
| 541 dstrect->w = dstrect->h = 0; | |
| 542 return 0; | |
| 543 } | |
| 544 | |
|
532
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545 static int SDL_FillRect1(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
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546 { |
|
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547 /* FIXME: We have to worry about packing order.. *sigh* */ |
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548 SDL_SetError("1-bpp rect fill not yet implemented"); |
|
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549 return -1; |
|
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550 } |
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551 |
|
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552 static int SDL_FillRect4(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) |
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553 { |
|
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|
554 /* FIXME: We have to worry about packing order.. *sigh* */ |
|
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555 SDL_SetError("4-bpp rect fill not yet implemented"); |
|
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556 return -1; |
|
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|
557 } |
|
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|
558 |
| 0 | 559 /* |
| 560 * This function performs a fast fill of the given rectangle with 'color' | |
| 561 */ | |
| 562 int SDL_FillRect(SDL_Surface *dst, SDL_Rect *dstrect, Uint32 color) | |
| 563 { | |
| 564 SDL_VideoDevice *video = current_video; | |
| 565 SDL_VideoDevice *this = current_video; | |
| 566 int x, y; | |
| 567 Uint8 *row; | |
| 568 | |
|
532
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|
569 /* This function doesn't work on surfaces < 8 bpp */ |
|
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570 if ( dst->format->BitsPerPixel < 8 ) { |
|
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571 switch(dst->format->BitsPerPixel) { |
|
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|
572 case 1: |
|
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573 return SDL_FillRect1(dst, dstrect, color); |
|
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574 break; |
|
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575 case 4: |
|
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576 return SDL_FillRect4(dst, dstrect, color); |
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577 break; |
|
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578 default: |
|
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579 SDL_SetError("Fill rect on unsupported surface format"); |
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580 return(-1); |
|
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581 break; |
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582 } |
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583 } |
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584 |
| 0 | 585 /* If 'dstrect' == NULL, then fill the whole surface */ |
| 586 if ( dstrect ) { | |
| 587 /* Perform clipping */ | |
| 588 if ( !SDL_IntersectRect(dstrect, &dst->clip_rect, dstrect) ) { | |
| 589 return(0); | |
| 590 } | |
| 591 } else { | |
| 592 dstrect = &dst->clip_rect; | |
| 593 } | |
| 594 | |
| 595 /* Check for hardware acceleration */ | |
| 596 if ( ((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) && | |
| 597 video->info.blit_fill ) { | |
|
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598 SDL_Rect hw_rect; |
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599 if ( dst == SDL_VideoSurface ) { |
|
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600 hw_rect = *dstrect; |
|
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601 hw_rect.x += current_video->offset_x; |
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602 hw_rect.y += current_video->offset_y; |
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603 dstrect = &hw_rect; |
|
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604 } |
| 0 | 605 return(video->FillHWRect(this, dst, dstrect, color)); |
| 606 } | |
| 607 | |
| 608 /* Perform software fill */ | |
| 609 if ( SDL_LockSurface(dst) != 0 ) { | |
| 610 return(-1); | |
| 611 } | |
| 612 row = (Uint8 *)dst->pixels+dstrect->y*dst->pitch+ | |
| 613 dstrect->x*dst->format->BytesPerPixel; | |
| 614 if ( dst->format->palette || (color == 0) ) { | |
| 615 x = dstrect->w*dst->format->BytesPerPixel; | |
| 616 if ( !color && !((long)row&3) && !(x&3) && !(dst->pitch&3) ) { | |
| 617 int n = x >> 2; | |
| 618 for ( y=dstrect->h; y; --y ) { | |
| 619 SDL_memset4(row, 0, n); | |
| 620 row += dst->pitch; | |
| 621 } | |
| 622 } else { | |
| 623 #ifdef __powerpc__ | |
| 624 /* | |
| 625 * memset() on PPC (both glibc and codewarrior) uses | |
| 626 * the dcbz (Data Cache Block Zero) instruction, which | |
| 627 * causes an alignment exception if the destination is | |
| 628 * uncachable, so only use it on software surfaces | |
| 629 */ | |
| 630 if((dst->flags & SDL_HWSURFACE) == SDL_HWSURFACE) { | |
| 631 if(dstrect->w >= 8) { | |
| 632 /* | |
| 633 * 64-bit stores are probably most | |
| 634 * efficient to uncached video memory | |
| 635 */ | |
| 636 double fill; | |
| 637 memset(&fill, color, (sizeof fill)); | |
| 638 for(y = dstrect->h; y; y--) { | |
| 639 Uint8 *d = row; | |
| 640 unsigned n = x; | |
| 641 unsigned nn; | |
| 642 Uint8 c = color; | |
| 643 double f = fill; | |
| 644 while((unsigned long)d | |
| 645 & (sizeof(double) - 1)) { | |
| 646 *d++ = c; | |
| 647 n--; | |
| 648 } | |
| 649 nn = n / (sizeof(double) * 4); | |
| 650 while(nn) { | |
| 651 ((double *)d)[0] = f; | |
| 652 ((double *)d)[1] = f; | |
| 653 ((double *)d)[2] = f; | |
| 654 ((double *)d)[3] = f; | |
| 655 d += 4*sizeof(double); | |
| 656 nn--; | |
| 657 } | |
| 658 n &= ~(sizeof(double) * 4 - 1); | |
| 659 nn = n / sizeof(double); | |
| 660 while(nn) { | |
| 661 *(double *)d = f; | |
| 662 d += sizeof(double); | |
| 663 nn--; | |
| 664 } | |
| 665 n &= ~(sizeof(double) - 1); | |
| 666 while(n) { | |
| 667 *d++ = c; | |
| 668 n--; | |
| 669 } | |
| 670 row += dst->pitch; | |
| 671 } | |
| 672 } else { | |
| 673 /* narrow boxes */ | |
| 674 for(y = dstrect->h; y; y--) { | |
| 675 Uint8 *d = row; | |
| 676 Uint8 c = color; | |
| 677 int n = x; | |
| 678 while(n) { | |
| 679 *d++ = c; | |
| 680 n--; | |
| 681 } | |
| 682 row += dst->pitch; | |
| 683 } | |
| 684 } | |
| 685 } else | |
| 686 #endif /* __powerpc__ */ | |
| 687 { | |
| 688 for(y = dstrect->h; y; y--) { | |
| 689 memset(row, color, x); | |
| 690 row += dst->pitch; | |
| 691 } | |
| 692 } | |
| 693 } | |
| 694 } else { | |
| 695 switch (dst->format->BytesPerPixel) { | |
| 696 case 2: | |
| 697 for ( y=dstrect->h; y; --y ) { | |
| 698 Uint16 *pixels = (Uint16 *)row; | |
| 699 Uint16 c = color; | |
| 700 Uint32 cc = (Uint32)c << 16 | c; | |
| 701 int n = dstrect->w; | |
| 702 if((unsigned long)pixels & 3) { | |
| 703 *pixels++ = c; | |
| 704 n--; | |
| 705 } | |
| 706 if(n >> 1) | |
| 707 SDL_memset4(pixels, cc, n >> 1); | |
| 708 if(n & 1) | |
| 709 pixels[n - 1] = c; | |
| 710 row += dst->pitch; | |
| 711 } | |
| 712 break; | |
| 713 | |
| 714 case 3: | |
| 715 if(SDL_BYTEORDER == SDL_BIG_ENDIAN) | |
| 716 color <<= 8; | |
| 717 for ( y=dstrect->h; y; --y ) { | |
| 718 Uint8 *pixels = row; | |
| 719 for ( x=dstrect->w; x; --x ) { | |
| 720 memcpy(pixels, &color, 3); | |
| 721 pixels += 3; | |
| 722 } | |
| 723 row += dst->pitch; | |
| 724 } | |
| 725 break; | |
| 726 | |
| 727 case 4: | |
| 728 for(y = dstrect->h; y; --y) { | |
| 729 SDL_memset4(row, color, dstrect->w); | |
| 730 row += dst->pitch; | |
| 731 } | |
| 732 break; | |
| 733 } | |
| 734 } | |
| 735 SDL_UnlockSurface(dst); | |
| 736 | |
| 737 /* We're done! */ | |
| 738 return(0); | |
| 739 } | |
| 740 | |
| 741 /* | |
| 742 * Lock a surface to directly access the pixels | |
| 743 */ | |
| 744 int SDL_LockSurface (SDL_Surface *surface) | |
| 745 { | |
| 746 if ( ! surface->locked ) { | |
| 747 /* Perform the lock */ | |
| 748 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
| 749 SDL_VideoDevice *video = current_video; | |
| 750 SDL_VideoDevice *this = current_video; | |
| 751 if ( video->LockHWSurface(this, surface) < 0 ) { | |
| 752 return(-1); | |
| 753 } | |
| 754 } | |
| 755 if ( surface->flags & SDL_RLEACCEL ) { | |
| 756 SDL_UnRLESurface(surface, 1); | |
| 757 surface->flags |= SDL_RLEACCEL; /* save accel'd state */ | |
| 758 } | |
| 759 /* This needs to be done here in case pixels changes value */ | |
| 760 surface->pixels = (Uint8 *)surface->pixels + surface->offset; | |
| 761 } | |
| 762 | |
| 763 /* Increment the surface lock count, for recursive locks */ | |
| 764 ++surface->locked; | |
| 765 | |
| 766 /* Ready to go.. */ | |
| 767 return(0); | |
| 768 } | |
| 769 /* | |
| 770 * Unlock a previously locked surface | |
| 771 */ | |
| 772 void SDL_UnlockSurface (SDL_Surface *surface) | |
| 773 { | |
| 774 /* Only perform an unlock if we are locked */ | |
| 775 if ( ! surface->locked || (--surface->locked > 0) ) { | |
| 776 return; | |
| 777 } | |
| 778 | |
| 779 /* Perform the unlock */ | |
| 780 surface->pixels = (Uint8 *)surface->pixels - surface->offset; | |
| 781 | |
| 782 /* Unlock hardware or accelerated surfaces */ | |
| 783 if ( surface->flags & (SDL_HWSURFACE|SDL_ASYNCBLIT) ) { | |
| 784 SDL_VideoDevice *video = current_video; | |
| 785 SDL_VideoDevice *this = current_video; | |
| 786 video->UnlockHWSurface(this, surface); | |
| 787 } else { | |
| 788 /* Update RLE encoded surface with new data */ | |
| 789 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { | |
| 790 surface->flags &= ~SDL_RLEACCEL; /* stop lying */ | |
| 791 SDL_RLESurface(surface); | |
| 792 } | |
| 793 } | |
| 794 } | |
| 795 | |
| 796 /* | |
| 797 * Convert a surface into the specified pixel format. | |
| 798 */ | |
| 799 SDL_Surface * SDL_ConvertSurface (SDL_Surface *surface, | |
| 800 SDL_PixelFormat *format, Uint32 flags) | |
| 801 { | |
| 802 SDL_Surface *convert; | |
| 803 Uint32 colorkey = 0; | |
| 804 Uint8 alpha = 0; | |
| 805 Uint32 surface_flags; | |
| 806 SDL_Rect bounds; | |
| 807 | |
| 808 /* Check for empty destination palette! (results in empty image) */ | |
| 809 if ( format->palette != NULL ) { | |
| 810 int i; | |
| 811 for ( i=0; i<format->palette->ncolors; ++i ) { | |
| 812 if ( (format->palette->colors[i].r != 0) || | |
| 813 (format->palette->colors[i].g != 0) || | |
| 814 (format->palette->colors[i].b != 0) ) | |
| 815 break; | |
| 816 } | |
| 817 if ( i == format->palette->ncolors ) { | |
| 818 SDL_SetError("Empty destination palette"); | |
| 819 return(NULL); | |
| 820 } | |
| 821 } | |
| 822 | |
|
264
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changeset
|
823 /* Only create hw surfaces with alpha channel if hw alpha blits |
|
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824 are supported */ |
|
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825 if(format->Amask != 0 && (flags & SDL_HWSURFACE)) { |
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826 const SDL_VideoInfo *vi = SDL_GetVideoInfo(); |
|
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827 if(!vi || !vi->blit_hw_A) |
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|
828 flags &= ~SDL_HWSURFACE; |
|
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829 } |
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|
830 |
| 0 | 831 /* Create a new surface with the desired format */ |
| 832 convert = SDL_CreateRGBSurface(flags, | |
| 833 surface->w, surface->h, format->BitsPerPixel, | |
| 834 format->Rmask, format->Gmask, format->Bmask, format->Amask); | |
| 835 if ( convert == NULL ) { | |
| 836 return(NULL); | |
| 837 } | |
| 838 | |
| 839 /* Copy the palette if any */ | |
| 840 if ( format->palette && convert->format->palette ) { | |
| 841 memcpy(convert->format->palette->colors, | |
| 842 format->palette->colors, | |
| 843 format->palette->ncolors*sizeof(SDL_Color)); | |
| 844 convert->format->palette->ncolors = format->palette->ncolors; | |
| 845 } | |
| 846 | |
| 847 /* Save the original surface color key and alpha */ | |
| 848 surface_flags = surface->flags; | |
| 849 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 850 /* Convert colourkeyed surfaces to RGBA if requested */ | |
| 851 if((flags & SDL_SRCCOLORKEY) != SDL_SRCCOLORKEY | |
| 852 && format->Amask) { | |
| 853 surface_flags &= ~SDL_SRCCOLORKEY; | |
| 854 } else { | |
| 855 colorkey = surface->format->colorkey; | |
| 856 SDL_SetColorKey(surface, 0, 0); | |
| 857 } | |
| 858 } | |
| 859 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
|
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diff
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|
860 /* Copy over the alpha channel to RGBA if requested */ |
|
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diff
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861 if ( format->Amask ) { |
|
41cadcba32e8
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diff
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|
862 surface->flags &= ~SDL_SRCALPHA; |
|
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863 } else { |
|
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864 alpha = surface->format->alpha; |
|
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865 SDL_SetAlpha(surface, 0, 0); |
|
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diff
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|
866 } |
| 0 | 867 } |
| 868 | |
| 869 /* Copy over the image data */ | |
| 870 bounds.x = 0; | |
| 871 bounds.y = 0; | |
| 872 bounds.w = surface->w; | |
| 873 bounds.h = surface->h; | |
| 874 SDL_LowerBlit(surface, &bounds, convert, &bounds); | |
| 875 | |
| 876 /* Clean up the original surface, and update converted surface */ | |
| 877 if ( convert != NULL ) { | |
| 878 SDL_SetClipRect(convert, &surface->clip_rect); | |
| 879 } | |
| 880 if ( (surface_flags & SDL_SRCCOLORKEY) == SDL_SRCCOLORKEY ) { | |
| 881 Uint32 cflags = surface_flags&(SDL_SRCCOLORKEY|SDL_RLEACCELOK); | |
| 882 if ( convert != NULL ) { | |
| 883 Uint8 keyR, keyG, keyB; | |
| 884 | |
| 885 SDL_GetRGB(colorkey,surface->format,&keyR,&keyG,&keyB); | |
| 886 SDL_SetColorKey(convert, cflags|(flags&SDL_RLEACCELOK), | |
| 887 SDL_MapRGB(convert->format, keyR, keyG, keyB)); | |
| 888 } | |
| 889 SDL_SetColorKey(surface, cflags, colorkey); | |
| 890 } | |
| 891 if ( (surface_flags & SDL_SRCALPHA) == SDL_SRCALPHA ) { | |
| 892 Uint32 aflags = surface_flags&(SDL_SRCALPHA|SDL_RLEACCELOK); | |
| 893 if ( convert != NULL ) { | |
| 894 SDL_SetAlpha(convert, aflags|(flags&SDL_RLEACCELOK), | |
| 895 alpha); | |
| 896 } | |
|
431
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parents:
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diff
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897 if ( format->Amask ) { |
|
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898 surface->flags |= SDL_SRCALPHA; |
|
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899 } else { |
|
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900 SDL_SetAlpha(surface, aflags, alpha); |
|
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901 } |
| 0 | 902 } |
| 903 | |
| 904 /* We're ready to go! */ | |
| 905 return(convert); | |
| 906 } | |
| 907 | |
| 908 /* | |
| 909 * Free a surface created by the above function. | |
| 910 */ | |
| 911 void SDL_FreeSurface (SDL_Surface *surface) | |
| 912 { | |
| 913 /* Free anything that's not NULL, and not the screen surface */ | |
| 914 if ((surface == NULL) || | |
| 915 (current_video && | |
| 916 ((surface == SDL_ShadowSurface)||(surface == SDL_VideoSurface)))) { | |
| 917 return; | |
| 918 } | |
| 919 if ( --surface->refcount > 0 ) { | |
| 920 return; | |
| 921 } | |
|
915
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diff
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922 while ( surface->locked > 0 ) { |
|
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923 SDL_UnlockSurface(surface); |
|
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|
924 } |
| 0 | 925 if ( (surface->flags & SDL_RLEACCEL) == SDL_RLEACCEL ) { |
| 926 SDL_UnRLESurface(surface, 0); | |
| 927 } | |
| 928 if ( surface->format ) { | |
| 929 SDL_FreeFormat(surface->format); | |
| 930 surface->format = NULL; | |
| 931 } | |
| 932 if ( surface->map != NULL ) { | |
| 933 SDL_FreeBlitMap(surface->map); | |
| 934 surface->map = NULL; | |
| 935 } | |
|
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|
936 if ( surface->hwdata ) { |
| 0 | 937 SDL_VideoDevice *video = current_video; |
| 938 SDL_VideoDevice *this = current_video; | |
| 939 video->FreeHWSurface(this, surface); | |
| 940 } | |
| 941 if ( surface->pixels && | |
| 942 ((surface->flags & SDL_PREALLOC) != SDL_PREALLOC) ) { | |
| 943 free(surface->pixels); | |
| 944 } | |
| 945 free(surface); | |
| 946 #ifdef CHECK_LEAKS | |
| 947 --surfaces_allocated; | |
| 948 #endif | |
| 949 } |