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| 1 /* | |
| 2 * Copyright 2006 The Android Open Source Project | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license that can be | |
| 5 * found in the LICENSE file. | |
| 6 */ | |
| 7 | |
| 8 | |
| 9 #include "SkMovie.h" | |
| 10 #include "SkColor.h" | |
| 11 #include "SkColorPriv.h" | |
| 12 #include "SkStream.h" | |
| 13 #include "SkTemplates.h" | |
| 14 #include "SkUtils.h" | |
| 15 | |
| 16 #include "gif_lib.h" | |
| 17 | |
| 18 #if GIFLIB_MAJOR < 5 || (GIFLIB_MAJOR == 5 && GIFLIB_MINOR == 0) | |
| 19 #define DGifCloseFile(a, b) DGifCloseFile(a) | |
| 20 #endif | |
| 21 | |
| 22 class SkGIFMovie : public SkMovie { | |
| 23 public: | |
| 24 SkGIFMovie(SkStream* stream); | |
| 25 virtual ~SkGIFMovie(); | |
| 26 | |
| 27 protected: | |
| 28 virtual bool onGetInfo(Info*); | |
| 29 virtual bool onSetTime(SkMSec); | |
| 30 virtual bool onGetBitmap(SkBitmap*); | |
| 31 | |
| 32 private: | |
| 33 GifFileType* fGIF; | |
| 34 int fCurrIndex; | |
| 35 int fLastDrawIndex; | |
| 36 SkBitmap fBackup; | |
| 37 SkColor fPaintingColor; | |
| 38 }; | |
| 39 | |
| 40 static int Decode(GifFileType* fileType, GifByteType* out, int size) { | |
| 41 SkStream* stream = (SkStream*) fileType->UserData; | |
| 42 return (int) stream->read(out, size); | |
| 43 } | |
| 44 | |
| 45 SkGIFMovie::SkGIFMovie(SkStream* stream) | |
| 46 { | |
| 47 #if GIFLIB_MAJOR < 5 | |
| 48 fGIF = DGifOpen( stream, Decode ); | |
| 49 #else | |
| 50 fGIF = DGifOpen( stream, Decode, nullptr ); | |
| 51 #endif | |
| 52 if (nullptr == fGIF) | |
| 53 return; | |
| 54 | |
| 55 if (DGifSlurp(fGIF) != GIF_OK) | |
| 56 { | |
| 57 DGifCloseFile(fGIF, nullptr); | |
| 58 fGIF = nullptr; | |
| 59 } | |
| 60 fCurrIndex = -1; | |
| 61 fLastDrawIndex = -1; | |
| 62 fPaintingColor = SkPackARGB32(0, 0, 0, 0); | |
| 63 } | |
| 64 | |
| 65 SkGIFMovie::~SkGIFMovie() | |
| 66 { | |
| 67 if (fGIF) | |
| 68 DGifCloseFile(fGIF, nullptr); | |
| 69 } | |
| 70 | |
| 71 static SkMSec savedimage_duration(const SavedImage* image) | |
| 72 { | |
| 73 for (int j = 0; j < image->ExtensionBlockCount; j++) | |
| 74 { | |
| 75 if (image->ExtensionBlocks[j].Function == GRAPHICS_EXT_FUNC_CODE) | |
| 76 { | |
| 77 SkASSERT(image->ExtensionBlocks[j].ByteCount >= 4); | |
| 78 const uint8_t* b = (const uint8_t*)image->ExtensionBlocks[j].Bytes; | |
| 79 return ((b[2] << 8) | b[1]) * 10; | |
| 80 } | |
| 81 } | |
| 82 return 0; | |
| 83 } | |
| 84 | |
| 85 bool SkGIFMovie::onGetInfo(Info* info) | |
| 86 { | |
| 87 if (nullptr == fGIF) | |
| 88 return false; | |
| 89 | |
| 90 SkMSec dur = 0; | |
| 91 for (int i = 0; i < fGIF->ImageCount; i++) | |
| 92 dur += savedimage_duration(&fGIF->SavedImages[i]); | |
| 93 | |
| 94 info->fDuration = dur; | |
| 95 info->fWidth = fGIF->SWidth; | |
| 96 info->fHeight = fGIF->SHeight; | |
| 97 info->fIsOpaque = false; // how to compute? | |
| 98 return true; | |
| 99 } | |
| 100 | |
| 101 bool SkGIFMovie::onSetTime(SkMSec time) | |
| 102 { | |
| 103 if (nullptr == fGIF) | |
| 104 return false; | |
| 105 | |
| 106 SkMSec dur = 0; | |
| 107 for (int i = 0; i < fGIF->ImageCount; i++) | |
| 108 { | |
| 109 dur += savedimage_duration(&fGIF->SavedImages[i]); | |
| 110 if (dur >= time) | |
| 111 { | |
| 112 fCurrIndex = i; | |
| 113 return fLastDrawIndex != fCurrIndex; | |
| 114 } | |
| 115 } | |
| 116 fCurrIndex = fGIF->ImageCount - 1; | |
| 117 return true; | |
| 118 } | |
| 119 | |
| 120 static void copyLine(uint32_t* dst, const unsigned char* src, const ColorMapObje
ct* cmap, | |
| 121 int transparent, int width) | |
| 122 { | |
| 123 for (; width > 0; width--, src++, dst++) { | |
| 124 if (*src != transparent) { | |
| 125 const GifColorType& col = cmap->Colors[*src]; | |
| 126 *dst = SkPackARGB32(0xFF, col.Red, col.Green, col.Blue); | |
| 127 } | |
| 128 } | |
| 129 } | |
| 130 | |
| 131 #if GIFLIB_MAJOR < 5 | |
| 132 static void copyInterlaceGroup(SkBitmap* bm, const unsigned char*& src, | |
| 133 const ColorMapObject* cmap, int transparent, int
copyWidth, | |
| 134 int copyHeight, const GifImageDesc& imageDesc, in
t rowStep, | |
| 135 int startRow) | |
| 136 { | |
| 137 int row; | |
| 138 // every 'rowStep'th row, starting with row 'startRow' | |
| 139 for (row = startRow; row < copyHeight; row += rowStep) { | |
| 140 uint32_t* dst = bm->getAddr32(imageDesc.Left, imageDesc.Top + row); | |
| 141 copyLine(dst, src, cmap, transparent, copyWidth); | |
| 142 src += imageDesc.Width; | |
| 143 } | |
| 144 | |
| 145 // pad for rest height | |
| 146 src += imageDesc.Width * ((imageDesc.Height - row + rowStep - 1) / rowStep); | |
| 147 } | |
| 148 | |
| 149 static void blitInterlace(SkBitmap* bm, const SavedImage* frame, const ColorMapO
bject* cmap, | |
| 150 int transparent) | |
| 151 { | |
| 152 int width = bm->width(); | |
| 153 int height = bm->height(); | |
| 154 GifWord copyWidth = frame->ImageDesc.Width; | |
| 155 if (frame->ImageDesc.Left + copyWidth > width) { | |
| 156 copyWidth = width - frame->ImageDesc.Left; | |
| 157 } | |
| 158 | |
| 159 GifWord copyHeight = frame->ImageDesc.Height; | |
| 160 if (frame->ImageDesc.Top + copyHeight > height) { | |
| 161 copyHeight = height - frame->ImageDesc.Top; | |
| 162 } | |
| 163 | |
| 164 // deinterlace | |
| 165 const unsigned char* src = (unsigned char*)frame->RasterBits; | |
| 166 | |
| 167 // group 1 - every 8th row, starting with row 0 | |
| 168 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 8, 0); | |
| 169 | |
| 170 // group 2 - every 8th row, starting with row 4 | |
| 171 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 8, 4); | |
| 172 | |
| 173 // group 3 - every 4th row, starting with row 2 | |
| 174 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 4, 2); | |
| 175 | |
| 176 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 2, 1); | |
| 177 } | |
| 178 #endif | |
| 179 | |
| 180 static void blitNormal(SkBitmap* bm, const SavedImage* frame, const ColorMapObje
ct* cmap, | |
| 181 int transparent) | |
| 182 { | |
| 183 int width = bm->width(); | |
| 184 int height = bm->height(); | |
| 185 const unsigned char* src = (unsigned char*)frame->RasterBits; | |
| 186 uint32_t* dst = bm->getAddr32(frame->ImageDesc.Left, frame->ImageDesc.Top); | |
| 187 GifWord copyWidth = frame->ImageDesc.Width; | |
| 188 if (frame->ImageDesc.Left + copyWidth > width) { | |
| 189 copyWidth = width - frame->ImageDesc.Left; | |
| 190 } | |
| 191 | |
| 192 GifWord copyHeight = frame->ImageDesc.Height; | |
| 193 if (frame->ImageDesc.Top + copyHeight > height) { | |
| 194 copyHeight = height - frame->ImageDesc.Top; | |
| 195 } | |
| 196 | |
| 197 for (; copyHeight > 0; copyHeight--) { | |
| 198 copyLine(dst, src, cmap, transparent, copyWidth); | |
| 199 src += frame->ImageDesc.Width; | |
| 200 dst += width; | |
| 201 } | |
| 202 } | |
| 203 | |
| 204 static void fillRect(SkBitmap* bm, GifWord left, GifWord top, GifWord width, Gif
Word height, | |
| 205 uint32_t col) | |
| 206 { | |
| 207 int bmWidth = bm->width(); | |
| 208 int bmHeight = bm->height(); | |
| 209 uint32_t* dst = bm->getAddr32(left, top); | |
| 210 GifWord copyWidth = width; | |
| 211 if (left + copyWidth > bmWidth) { | |
| 212 copyWidth = bmWidth - left; | |
| 213 } | |
| 214 | |
| 215 GifWord copyHeight = height; | |
| 216 if (top + copyHeight > bmHeight) { | |
| 217 copyHeight = bmHeight - top; | |
| 218 } | |
| 219 | |
| 220 for (; copyHeight > 0; copyHeight--) { | |
| 221 sk_memset32(dst, col, copyWidth); | |
| 222 dst += bmWidth; | |
| 223 } | |
| 224 } | |
| 225 | |
| 226 static void drawFrame(SkBitmap* bm, const SavedImage* frame, const ColorMapObjec
t* cmap) | |
| 227 { | |
| 228 int transparent = -1; | |
| 229 | |
| 230 for (int i = 0; i < frame->ExtensionBlockCount; ++i) { | |
| 231 ExtensionBlock* eb = frame->ExtensionBlocks + i; | |
| 232 if (eb->Function == GRAPHICS_EXT_FUNC_CODE && | |
| 233 eb->ByteCount == 4) { | |
| 234 bool has_transparency = ((eb->Bytes[0] & 1) == 1); | |
| 235 if (has_transparency) { | |
| 236 transparent = (unsigned char)eb->Bytes[3]; | |
| 237 } | |
| 238 } | |
| 239 } | |
| 240 | |
| 241 if (frame->ImageDesc.ColorMap != nullptr) { | |
| 242 // use local color table | |
| 243 cmap = frame->ImageDesc.ColorMap; | |
| 244 } | |
| 245 | |
| 246 if (cmap == nullptr || cmap->ColorCount != (1 << cmap->BitsPerPixel)) { | |
| 247 SkDEBUGFAIL("bad colortable setup"); | |
| 248 return; | |
| 249 } | |
| 250 | |
| 251 #if GIFLIB_MAJOR < 5 | |
| 252 // before GIFLIB 5, de-interlacing wasn't done by library at load time | |
| 253 if (frame->ImageDesc.Interlace) { | |
| 254 blitInterlace(bm, frame, cmap, transparent); | |
| 255 return; | |
| 256 } | |
| 257 #endif | |
| 258 | |
| 259 blitNormal(bm, frame, cmap, transparent); | |
| 260 } | |
| 261 | |
| 262 static bool checkIfWillBeCleared(const SavedImage* frame) | |
| 263 { | |
| 264 for (int i = 0; i < frame->ExtensionBlockCount; ++i) { | |
| 265 ExtensionBlock* eb = frame->ExtensionBlocks + i; | |
| 266 if (eb->Function == GRAPHICS_EXT_FUNC_CODE && | |
| 267 eb->ByteCount == 4) { | |
| 268 // check disposal method | |
| 269 int disposal = ((eb->Bytes[0] >> 2) & 7); | |
| 270 if (disposal == 2 || disposal == 3) { | |
| 271 return true; | |
| 272 } | |
| 273 } | |
| 274 } | |
| 275 return false; | |
| 276 } | |
| 277 | |
| 278 static void getTransparencyAndDisposalMethod(const SavedImage* frame, bool* tran
s, int* disposal) | |
| 279 { | |
| 280 *trans = false; | |
| 281 *disposal = 0; | |
| 282 for (int i = 0; i < frame->ExtensionBlockCount; ++i) { | |
| 283 ExtensionBlock* eb = frame->ExtensionBlocks + i; | |
| 284 if (eb->Function == GRAPHICS_EXT_FUNC_CODE && | |
| 285 eb->ByteCount == 4) { | |
| 286 *trans = ((eb->Bytes[0] & 1) == 1); | |
| 287 *disposal = ((eb->Bytes[0] >> 2) & 7); | |
| 288 } | |
| 289 } | |
| 290 } | |
| 291 | |
| 292 // return true if area of 'target' is completely covers area of 'covered' | |
| 293 static bool checkIfCover(const SavedImage* target, const SavedImage* covered) | |
| 294 { | |
| 295 if (target->ImageDesc.Left <= covered->ImageDesc.Left | |
| 296 && covered->ImageDesc.Left + covered->ImageDesc.Width <= | |
| 297 target->ImageDesc.Left + target->ImageDesc.Width | |
| 298 && target->ImageDesc.Top <= covered->ImageDesc.Top | |
| 299 && covered->ImageDesc.Top + covered->ImageDesc.Height <= | |
| 300 target->ImageDesc.Top + target->ImageDesc.Height) { | |
| 301 return true; | |
| 302 } | |
| 303 return false; | |
| 304 } | |
| 305 | |
| 306 static void disposeFrameIfNeeded(SkBitmap* bm, const SavedImage* cur, const Save
dImage* next, | |
| 307 SkBitmap* backup, SkColor color) | |
| 308 { | |
| 309 // We can skip disposal process if next frame is not transparent | |
| 310 // and completely covers current area | |
| 311 bool curTrans; | |
| 312 int curDisposal; | |
| 313 getTransparencyAndDisposalMethod(cur, &curTrans, &curDisposal); | |
| 314 bool nextTrans; | |
| 315 int nextDisposal; | |
| 316 getTransparencyAndDisposalMethod(next, &nextTrans, &nextDisposal); | |
| 317 if ((curDisposal == 2 || curDisposal == 3) | |
| 318 && (nextTrans || !checkIfCover(next, cur))) { | |
| 319 switch (curDisposal) { | |
| 320 // restore to background color | |
| 321 // -> 'background' means background under this image. | |
| 322 case 2: | |
| 323 fillRect(bm, cur->ImageDesc.Left, cur->ImageDesc.Top, | |
| 324 cur->ImageDesc.Width, cur->ImageDesc.Height, | |
| 325 color); | |
| 326 break; | |
| 327 | |
| 328 // restore to previous | |
| 329 case 3: | |
| 330 bm->swap(*backup); | |
| 331 break; | |
| 332 } | |
| 333 } | |
| 334 | |
| 335 // Save current image if next frame's disposal method == 3 | |
| 336 if (nextDisposal == 3) { | |
| 337 const uint32_t* src = bm->getAddr32(0, 0); | |
| 338 uint32_t* dst = backup->getAddr32(0, 0); | |
| 339 int cnt = bm->width() * bm->height(); | |
| 340 memcpy(dst, src, cnt*sizeof(uint32_t)); | |
| 341 } | |
| 342 } | |
| 343 | |
| 344 bool SkGIFMovie::onGetBitmap(SkBitmap* bm) | |
| 345 { | |
| 346 const GifFileType* gif = fGIF; | |
| 347 if (nullptr == gif) | |
| 348 return false; | |
| 349 | |
| 350 if (gif->ImageCount < 1) { | |
| 351 return false; | |
| 352 } | |
| 353 | |
| 354 const int width = gif->SWidth; | |
| 355 const int height = gif->SHeight; | |
| 356 if (width <= 0 || height <= 0) { | |
| 357 return false; | |
| 358 } | |
| 359 | |
| 360 // no need to draw | |
| 361 if (fLastDrawIndex >= 0 && fLastDrawIndex == fCurrIndex) { | |
| 362 return true; | |
| 363 } | |
| 364 | |
| 365 int startIndex = fLastDrawIndex + 1; | |
| 366 if (fLastDrawIndex < 0 || !bm->readyToDraw()) { | |
| 367 // first time | |
| 368 | |
| 369 startIndex = 0; | |
| 370 | |
| 371 // create bitmap | |
| 372 if (!bm->tryAllocN32Pixels(width, height)) { | |
| 373 return false; | |
| 374 } | |
| 375 // create bitmap for backup | |
| 376 if (!fBackup.tryAllocN32Pixels(width, height)) { | |
| 377 return false; | |
| 378 } | |
| 379 } else if (startIndex > fCurrIndex) { | |
| 380 // rewind to 1st frame for repeat | |
| 381 startIndex = 0; | |
| 382 } | |
| 383 | |
| 384 int lastIndex = fCurrIndex; | |
| 385 if (lastIndex < 0) { | |
| 386 // first time | |
| 387 lastIndex = 0; | |
| 388 } else if (lastIndex > fGIF->ImageCount - 1) { | |
| 389 // this block must not be reached. | |
| 390 lastIndex = fGIF->ImageCount - 1; | |
| 391 } | |
| 392 | |
| 393 SkColor bgColor = SkPackARGB32(0, 0, 0, 0); | |
| 394 if (gif->SColorMap != nullptr) { | |
| 395 const GifColorType& col = gif->SColorMap->Colors[fGIF->SBackGroundColor]
; | |
| 396 bgColor = SkColorSetARGB(0xFF, col.Red, col.Green, col.Blue); | |
| 397 } | |
| 398 | |
| 399 // draw each frames - not intelligent way | |
| 400 for (int i = startIndex; i <= lastIndex; i++) { | |
| 401 const SavedImage* cur = &fGIF->SavedImages[i]; | |
| 402 if (i == 0) { | |
| 403 bool trans; | |
| 404 int disposal; | |
| 405 getTransparencyAndDisposalMethod(cur, &trans, &disposal); | |
| 406 if (!trans && gif->SColorMap != nullptr) { | |
| 407 fPaintingColor = bgColor; | |
| 408 } else { | |
| 409 fPaintingColor = SkColorSetARGB(0, 0, 0, 0); | |
| 410 } | |
| 411 | |
| 412 bm->eraseColor(fPaintingColor); | |
| 413 fBackup.eraseColor(fPaintingColor); | |
| 414 } else { | |
| 415 // Dispose previous frame before move to next frame. | |
| 416 const SavedImage* prev = &fGIF->SavedImages[i-1]; | |
| 417 disposeFrameIfNeeded(bm, prev, cur, &fBackup, fPaintingColor); | |
| 418 } | |
| 419 | |
| 420 // Draw frame | |
| 421 // We can skip this process if this index is not last and disposal | |
| 422 // method == 2 or method == 3 | |
| 423 if (i == lastIndex || !checkIfWillBeCleared(cur)) { | |
| 424 drawFrame(bm, cur, gif->SColorMap); | |
| 425 } | |
| 426 } | |
| 427 | |
| 428 // save index | |
| 429 fLastDrawIndex = lastIndex; | |
| 430 return true; | |
| 431 } | |
| 432 | |
| 433 /////////////////////////////////////////////////////////////////////////////// | |
| 434 | |
| 435 #include "SkTRegistry.h" | |
| 436 | |
| 437 SkMovie* Factory(SkStreamRewindable* stream) { | |
| 438 char buf[GIF_STAMP_LEN]; | |
| 439 if (stream->read(buf, GIF_STAMP_LEN) == GIF_STAMP_LEN) { | |
| 440 if (memcmp(GIF_STAMP, buf, GIF_STAMP_LEN) == 0 || | |
| 441 memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 || | |
| 442 memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) { | |
| 443 // must rewind here, since our construct wants to re-read the data | |
| 444 stream->rewind(); | |
| 445 return new SkGIFMovie(stream); | |
| 446 } | |
| 447 } | |
| 448 return nullptr; | |
| 449 } | |
| 450 | |
| 451 static SkTRegistry<SkMovie*(*)(SkStreamRewindable*)> gReg(Factory); | |
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Chromium Code Reviews
Issue 2449213004:
Remove SkMovie and giflib (Closed)
