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| 1 | |
| 2 /* | |
| 3 * Copyright 2006 The Android Open Source Project | |
| 4 * | |
| 5 * Use of this source code is governed by a BSD-style license that can be | |
| 6 * found in the LICENSE file. | |
| 7 */ | |
| 8 | |
| 9 | |
| 10 #include "SkMovie.h" | |
| 11 #include "SkColor.h" | |
| 12 #include "SkColorPriv.h" | |
| 13 #include "SkStream.h" | |
| 14 #include "SkTemplates.h" | |
| 15 #include "SkUtils.h" | |
| 16 | |
| 17 #include "gif_lib.h" | |
| 18 | |
| 19 #if GIFLIB_MAJOR < 5 || (GIFLIB_MAJOR == 5 && GIFLIB_MINOR == 0) | |
| 20 #define DGifCloseFile(a, b) DGifCloseFile(a) | |
| 21 #endif | |
| 22 | |
| 23 class SkGIFMovie : public SkMovie { | |
| 24 public: | |
| 25 SkGIFMovie(SkStream* stream); | |
| 26 virtual ~SkGIFMovie(); | |
| 27 | |
| 28 protected: | |
| 29 virtual bool onGetInfo(Info*); | |
| 30 virtual bool onSetTime(SkMSec); | |
| 31 virtual bool onGetBitmap(SkBitmap*); | |
| 32 | |
| 33 private: | |
| 34 GifFileType* fGIF; | |
| 35 int fCurrIndex; | |
| 36 int fLastDrawIndex; | |
| 37 SkBitmap fBackup; | |
| 38 SkColor fPaintingColor; | |
| 39 }; | |
| 40 | |
| 41 static int Decode(GifFileType* fileType, GifByteType* out, int size) { | |
| 42 SkStream* stream = (SkStream*) fileType->UserData; | |
| 43 return (int) stream->read(out, size); | |
| 44 } | |
| 45 | |
| 46 SkGIFMovie::SkGIFMovie(SkStream* stream) | |
| 47 { | |
| 48 #if GIFLIB_MAJOR < 5 | |
| 49 fGIF = DGifOpen( stream, Decode ); | |
| 50 #else | |
| 51 fGIF = DGifOpen( stream, Decode, nullptr ); | |
| 52 #endif | |
| 53 if (nullptr == fGIF) | |
| 54 return; | |
| 55 | |
| 56 if (DGifSlurp(fGIF) != GIF_OK) | |
| 57 { | |
| 58 DGifCloseFile(fGIF, nullptr); | |
| 59 fGIF = nullptr; | |
| 60 } | |
| 61 fCurrIndex = -1; | |
| 62 fLastDrawIndex = -1; | |
| 63 fPaintingColor = SkPackARGB32(0, 0, 0, 0); | |
| 64 } | |
| 65 | |
| 66 SkGIFMovie::~SkGIFMovie() | |
| 67 { | |
| 68 if (fGIF) | |
| 69 DGifCloseFile(fGIF, nullptr); | |
| 70 } | |
| 71 | |
| 72 static SkMSec savedimage_duration(const SavedImage* image) | |
| 73 { | |
| 74 for (int j = 0; j < image->ExtensionBlockCount; j++) | |
| 75 { | |
| 76 if (image->ExtensionBlocks[j].Function == GRAPHICS_EXT_FUNC_CODE) | |
| 77 { | |
| 78 SkASSERT(image->ExtensionBlocks[j].ByteCount >= 4); | |
| 79 const uint8_t* b = (const uint8_t*)image->ExtensionBlocks[j].Bytes; | |
| 80 return ((b[2] << 8) | b[1]) * 10; | |
| 81 } | |
| 82 } | |
| 83 return 0; | |
| 84 } | |
| 85 | |
| 86 bool SkGIFMovie::onGetInfo(Info* info) | |
| 87 { | |
| 88 if (nullptr == fGIF) | |
| 89 return false; | |
| 90 | |
| 91 SkMSec dur = 0; | |
| 92 for (int i = 0; i < fGIF->ImageCount; i++) | |
| 93 dur += savedimage_duration(&fGIF->SavedImages[i]); | |
| 94 | |
| 95 info->fDuration = dur; | |
| 96 info->fWidth = fGIF->SWidth; | |
| 97 info->fHeight = fGIF->SHeight; | |
| 98 info->fIsOpaque = false; // how to compute? | |
| 99 return true; | |
| 100 } | |
| 101 | |
| 102 bool SkGIFMovie::onSetTime(SkMSec time) | |
| 103 { | |
| 104 if (nullptr == fGIF) | |
| 105 return false; | |
| 106 | |
| 107 SkMSec dur = 0; | |
| 108 for (int i = 0; i < fGIF->ImageCount; i++) | |
| 109 { | |
| 110 dur += savedimage_duration(&fGIF->SavedImages[i]); | |
| 111 if (dur >= time) | |
| 112 { | |
| 113 fCurrIndex = i; | |
| 114 return fLastDrawIndex != fCurrIndex; | |
| 115 } | |
| 116 } | |
| 117 fCurrIndex = fGIF->ImageCount - 1; | |
| 118 return true; | |
| 119 } | |
| 120 | |
| 121 static void copyLine(uint32_t* dst, const unsigned char* src, const ColorMapObje
ct* cmap, | |
| 122 int transparent, int width) | |
| 123 { | |
| 124 for (; width > 0; width--, src++, dst++) { | |
| 125 if (*src != transparent) { | |
| 126 const GifColorType& col = cmap->Colors[*src]; | |
| 127 *dst = SkPackARGB32(0xFF, col.Red, col.Green, col.Blue); | |
| 128 } | |
| 129 } | |
| 130 } | |
| 131 | |
| 132 #if GIFLIB_MAJOR < 5 | |
| 133 static void copyInterlaceGroup(SkBitmap* bm, const unsigned char*& src, | |
| 134 const ColorMapObject* cmap, int transparent, int
copyWidth, | |
| 135 int copyHeight, const GifImageDesc& imageDesc, in
t rowStep, | |
| 136 int startRow) | |
| 137 { | |
| 138 int row; | |
| 139 // every 'rowStep'th row, starting with row 'startRow' | |
| 140 for (row = startRow; row < copyHeight; row += rowStep) { | |
| 141 uint32_t* dst = bm->getAddr32(imageDesc.Left, imageDesc.Top + row); | |
| 142 copyLine(dst, src, cmap, transparent, copyWidth); | |
| 143 src += imageDesc.Width; | |
| 144 } | |
| 145 | |
| 146 // pad for rest height | |
| 147 src += imageDesc.Width * ((imageDesc.Height - row + rowStep - 1) / rowStep); | |
| 148 } | |
| 149 | |
| 150 static void blitInterlace(SkBitmap* bm, const SavedImage* frame, const ColorMapO
bject* cmap, | |
| 151 int transparent) | |
| 152 { | |
| 153 int width = bm->width(); | |
| 154 int height = bm->height(); | |
| 155 GifWord copyWidth = frame->ImageDesc.Width; | |
| 156 if (frame->ImageDesc.Left + copyWidth > width) { | |
| 157 copyWidth = width - frame->ImageDesc.Left; | |
| 158 } | |
| 159 | |
| 160 GifWord copyHeight = frame->ImageDesc.Height; | |
| 161 if (frame->ImageDesc.Top + copyHeight > height) { | |
| 162 copyHeight = height - frame->ImageDesc.Top; | |
| 163 } | |
| 164 | |
| 165 // deinterlace | |
| 166 const unsigned char* src = (unsigned char*)frame->RasterBits; | |
| 167 | |
| 168 // group 1 - every 8th row, starting with row 0 | |
| 169 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 8, 0); | |
| 170 | |
| 171 // group 2 - every 8th row, starting with row 4 | |
| 172 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 8, 4); | |
| 173 | |
| 174 // group 3 - every 4th row, starting with row 2 | |
| 175 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 4, 2); | |
| 176 | |
| 177 copyInterlaceGroup(bm, src, cmap, transparent, copyWidth, copyHeight, frame-
>ImageDesc, 2, 1); | |
| 178 } | |
| 179 #endif | |
| 180 | |
| 181 static void blitNormal(SkBitmap* bm, const SavedImage* frame, const ColorMapObje
ct* cmap, | |
| 182 int transparent) | |
| 183 { | |
| 184 int width = bm->width(); | |
| 185 int height = bm->height(); | |
| 186 const unsigned char* src = (unsigned char*)frame->RasterBits; | |
| 187 uint32_t* dst = bm->getAddr32(frame->ImageDesc.Left, frame->ImageDesc.Top); | |
| 188 GifWord copyWidth = frame->ImageDesc.Width; | |
| 189 if (frame->ImageDesc.Left + copyWidth > width) { | |
| 190 copyWidth = width - frame->ImageDesc.Left; | |
| 191 } | |
| 192 | |
| 193 GifWord copyHeight = frame->ImageDesc.Height; | |
| 194 if (frame->ImageDesc.Top + copyHeight > height) { | |
| 195 copyHeight = height - frame->ImageDesc.Top; | |
| 196 } | |
| 197 | |
| 198 for (; copyHeight > 0; copyHeight--) { | |
| 199 copyLine(dst, src, cmap, transparent, copyWidth); | |
| 200 src += frame->ImageDesc.Width; | |
| 201 dst += width; | |
| 202 } | |
| 203 } | |
| 204 | |
| 205 static void fillRect(SkBitmap* bm, GifWord left, GifWord top, GifWord width, Gif
Word height, | |
| 206 uint32_t col) | |
| 207 { | |
| 208 int bmWidth = bm->width(); | |
| 209 int bmHeight = bm->height(); | |
| 210 uint32_t* dst = bm->getAddr32(left, top); | |
| 211 GifWord copyWidth = width; | |
| 212 if (left + copyWidth > bmWidth) { | |
| 213 copyWidth = bmWidth - left; | |
| 214 } | |
| 215 | |
| 216 GifWord copyHeight = height; | |
| 217 if (top + copyHeight > bmHeight) { | |
| 218 copyHeight = bmHeight - top; | |
| 219 } | |
| 220 | |
| 221 for (; copyHeight > 0; copyHeight--) { | |
| 222 sk_memset32(dst, col, copyWidth); | |
| 223 dst += bmWidth; | |
| 224 } | |
| 225 } | |
| 226 | |
| 227 static void drawFrame(SkBitmap* bm, const SavedImage* frame, const ColorMapObjec
t* cmap) | |
| 228 { | |
| 229 int transparent = -1; | |
| 230 | |
| 231 for (int i = 0; i < frame->ExtensionBlockCount; ++i) { | |
| 232 ExtensionBlock* eb = frame->ExtensionBlocks + i; | |
| 233 if (eb->Function == GRAPHICS_EXT_FUNC_CODE && | |
| 234 eb->ByteCount == 4) { | |
| 235 bool has_transparency = ((eb->Bytes[0] & 1) == 1); | |
| 236 if (has_transparency) { | |
| 237 transparent = (unsigned char)eb->Bytes[3]; | |
| 238 } | |
| 239 } | |
| 240 } | |
| 241 | |
| 242 if (frame->ImageDesc.ColorMap != nullptr) { | |
| 243 // use local color table | |
| 244 cmap = frame->ImageDesc.ColorMap; | |
| 245 } | |
| 246 | |
| 247 if (cmap == nullptr || cmap->ColorCount != (1 << cmap->BitsPerPixel)) { | |
| 248 SkDEBUGFAIL("bad colortable setup"); | |
| 249 return; | |
| 250 } | |
| 251 | |
| 252 #if GIFLIB_MAJOR < 5 | |
| 253 // before GIFLIB 5, de-interlacing wasn't done by library at load time | |
| 254 if (frame->ImageDesc.Interlace) { | |
| 255 blitInterlace(bm, frame, cmap, transparent); | |
| 256 return; | |
| 257 } | |
| 258 #endif | |
| 259 | |
| 260 blitNormal(bm, frame, cmap, transparent); | |
| 261 } | |
| 262 | |
| 263 static bool checkIfWillBeCleared(const SavedImage* frame) | |
| 264 { | |
| 265 for (int i = 0; i < frame->ExtensionBlockCount; ++i) { | |
| 266 ExtensionBlock* eb = frame->ExtensionBlocks + i; | |
| 267 if (eb->Function == GRAPHICS_EXT_FUNC_CODE && | |
| 268 eb->ByteCount == 4) { | |
| 269 // check disposal method | |
| 270 int disposal = ((eb->Bytes[0] >> 2) & 7); | |
| 271 if (disposal == 2 || disposal == 3) { | |
| 272 return true; | |
| 273 } | |
| 274 } | |
| 275 } | |
| 276 return false; | |
| 277 } | |
| 278 | |
| 279 static void getTransparencyAndDisposalMethod(const SavedImage* frame, bool* tran
s, int* disposal) | |
| 280 { | |
| 281 *trans = false; | |
| 282 *disposal = 0; | |
| 283 for (int i = 0; i < frame->ExtensionBlockCount; ++i) { | |
| 284 ExtensionBlock* eb = frame->ExtensionBlocks + i; | |
| 285 if (eb->Function == GRAPHICS_EXT_FUNC_CODE && | |
| 286 eb->ByteCount == 4) { | |
| 287 *trans = ((eb->Bytes[0] & 1) == 1); | |
| 288 *disposal = ((eb->Bytes[0] >> 2) & 7); | |
| 289 } | |
| 290 } | |
| 291 } | |
| 292 | |
| 293 // return true if area of 'target' is completely covers area of 'covered' | |
| 294 static bool checkIfCover(const SavedImage* target, const SavedImage* covered) | |
| 295 { | |
| 296 if (target->ImageDesc.Left <= covered->ImageDesc.Left | |
| 297 && covered->ImageDesc.Left + covered->ImageDesc.Width <= | |
| 298 target->ImageDesc.Left + target->ImageDesc.Width | |
| 299 && target->ImageDesc.Top <= covered->ImageDesc.Top | |
| 300 && covered->ImageDesc.Top + covered->ImageDesc.Height <= | |
| 301 target->ImageDesc.Top + target->ImageDesc.Height) { | |
| 302 return true; | |
| 303 } | |
| 304 return false; | |
| 305 } | |
| 306 | |
| 307 static void disposeFrameIfNeeded(SkBitmap* bm, const SavedImage* cur, const Save
dImage* next, | |
| 308 SkBitmap* backup, SkColor color) | |
| 309 { | |
| 310 // We can skip disposal process if next frame is not transparent | |
| 311 // and completely covers current area | |
| 312 bool curTrans; | |
| 313 int curDisposal; | |
| 314 getTransparencyAndDisposalMethod(cur, &curTrans, &curDisposal); | |
| 315 bool nextTrans; | |
| 316 int nextDisposal; | |
| 317 getTransparencyAndDisposalMethod(next, &nextTrans, &nextDisposal); | |
| 318 if ((curDisposal == 2 || curDisposal == 3) | |
| 319 && (nextTrans || !checkIfCover(next, cur))) { | |
| 320 switch (curDisposal) { | |
| 321 // restore to background color | |
| 322 // -> 'background' means background under this image. | |
| 323 case 2: | |
| 324 fillRect(bm, cur->ImageDesc.Left, cur->ImageDesc.Top, | |
| 325 cur->ImageDesc.Width, cur->ImageDesc.Height, | |
| 326 color); | |
| 327 break; | |
| 328 | |
| 329 // restore to previous | |
| 330 case 3: | |
| 331 bm->swap(*backup); | |
| 332 break; | |
| 333 } | |
| 334 } | |
| 335 | |
| 336 // Save current image if next frame's disposal method == 3 | |
| 337 if (nextDisposal == 3) { | |
| 338 const uint32_t* src = bm->getAddr32(0, 0); | |
| 339 uint32_t* dst = backup->getAddr32(0, 0); | |
| 340 int cnt = bm->width() * bm->height(); | |
| 341 memcpy(dst, src, cnt*sizeof(uint32_t)); | |
| 342 } | |
| 343 } | |
| 344 | |
| 345 bool SkGIFMovie::onGetBitmap(SkBitmap* bm) | |
| 346 { | |
| 347 const GifFileType* gif = fGIF; | |
| 348 if (nullptr == gif) | |
| 349 return false; | |
| 350 | |
| 351 if (gif->ImageCount < 1) { | |
| 352 return false; | |
| 353 } | |
| 354 | |
| 355 const int width = gif->SWidth; | |
| 356 const int height = gif->SHeight; | |
| 357 if (width <= 0 || height <= 0) { | |
| 358 return false; | |
| 359 } | |
| 360 | |
| 361 // no need to draw | |
| 362 if (fLastDrawIndex >= 0 && fLastDrawIndex == fCurrIndex) { | |
| 363 return true; | |
| 364 } | |
| 365 | |
| 366 int startIndex = fLastDrawIndex + 1; | |
| 367 if (fLastDrawIndex < 0 || !bm->readyToDraw()) { | |
| 368 // first time | |
| 369 | |
| 370 startIndex = 0; | |
| 371 | |
| 372 // create bitmap | |
| 373 if (!bm->tryAllocN32Pixels(width, height)) { | |
| 374 return false; | |
| 375 } | |
| 376 // create bitmap for backup | |
| 377 if (!fBackup.tryAllocN32Pixels(width, height)) { | |
| 378 return false; | |
| 379 } | |
| 380 } else if (startIndex > fCurrIndex) { | |
| 381 // rewind to 1st frame for repeat | |
| 382 startIndex = 0; | |
| 383 } | |
| 384 | |
| 385 int lastIndex = fCurrIndex; | |
| 386 if (lastIndex < 0) { | |
| 387 // first time | |
| 388 lastIndex = 0; | |
| 389 } else if (lastIndex > fGIF->ImageCount - 1) { | |
| 390 // this block must not be reached. | |
| 391 lastIndex = fGIF->ImageCount - 1; | |
| 392 } | |
| 393 | |
| 394 SkColor bgColor = SkPackARGB32(0, 0, 0, 0); | |
| 395 if (gif->SColorMap != nullptr) { | |
| 396 const GifColorType& col = gif->SColorMap->Colors[fGIF->SBackGroundColor]
; | |
| 397 bgColor = SkColorSetARGB(0xFF, col.Red, col.Green, col.Blue); | |
| 398 } | |
| 399 | |
| 400 // draw each frames - not intelligent way | |
| 401 for (int i = startIndex; i <= lastIndex; i++) { | |
| 402 const SavedImage* cur = &fGIF->SavedImages[i]; | |
| 403 if (i == 0) { | |
| 404 bool trans; | |
| 405 int disposal; | |
| 406 getTransparencyAndDisposalMethod(cur, &trans, &disposal); | |
| 407 if (!trans && gif->SColorMap != nullptr) { | |
| 408 fPaintingColor = bgColor; | |
| 409 } else { | |
| 410 fPaintingColor = SkColorSetARGB(0, 0, 0, 0); | |
| 411 } | |
| 412 | |
| 413 bm->eraseColor(fPaintingColor); | |
| 414 fBackup.eraseColor(fPaintingColor); | |
| 415 } else { | |
| 416 // Dispose previous frame before move to next frame. | |
| 417 const SavedImage* prev = &fGIF->SavedImages[i-1]; | |
| 418 disposeFrameIfNeeded(bm, prev, cur, &fBackup, fPaintingColor); | |
| 419 } | |
| 420 | |
| 421 // Draw frame | |
| 422 // We can skip this process if this index is not last and disposal | |
| 423 // method == 2 or method == 3 | |
| 424 if (i == lastIndex || !checkIfWillBeCleared(cur)) { | |
| 425 drawFrame(bm, cur, gif->SColorMap); | |
| 426 } | |
| 427 } | |
| 428 | |
| 429 // save index | |
| 430 fLastDrawIndex = lastIndex; | |
| 431 return true; | |
| 432 } | |
| 433 | |
| 434 /////////////////////////////////////////////////////////////////////////////// | |
| 435 | |
| 436 #include "SkTRegistry.h" | |
| 437 | |
| 438 SkMovie* Factory(SkStreamRewindable* stream) { | |
| 439 char buf[GIF_STAMP_LEN]; | |
| 440 if (stream->read(buf, GIF_STAMP_LEN) == GIF_STAMP_LEN) { | |
| 441 if (memcmp(GIF_STAMP, buf, GIF_STAMP_LEN) == 0 || | |
| 442 memcmp(GIF87_STAMP, buf, GIF_STAMP_LEN) == 0 || | |
| 443 memcmp(GIF89_STAMP, buf, GIF_STAMP_LEN) == 0) { | |
| 444 // must rewind here, since our construct wants to re-read the data | |
| 445 stream->rewind(); | |
| 446 return new SkGIFMovie(stream); | |
| 447 } | |
| 448 } | |
| 449 return nullptr; | |
| 450 } | |
| 451 | |
| 452 static SkTRegistry<SkMovie*(*)(SkStreamRewindable*)> gReg(Factory); | |
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Chromium Code Reviews
Issue 1836493002:
Rename encoders to Sk*ImageEncoder (Closed)
Base URL: https://skia.googlesource.com/skia.git@master