1 /* 2 * Copyright (C) 2006 Samuel Weinig (sam.weinig (at) gmail.com) 3 * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27 #include "config.h" 28 #include "core/platform/graphics/BitmapImage.h" 29 30 #include "core/platform/Timer.h" 31 #include "core/platform/graphics/FloatRect.h" 32 #include "core/platform/graphics/GraphicsContextStateSaver.h" 33 #include "core/platform/graphics/ImageObserver.h" 34 #include "core/platform/graphics/skia/NativeImageSkia.h" 35 #include "core/platform/graphics/skia/SkiaUtils.h" 36 #include "wtf/CurrentTime.h" 37 #include "wtf/PassRefPtr.h" 38 #include "wtf/Vector.h" 39 #include "wtf/text/WTFString.h" 40 41 namespace WebCore { 42 43 BitmapImage::BitmapImage(ImageObserver* observer) 44 : Image(observer) 45 , m_currentFrame(0) 46 , m_frames(0) 47 , m_frameTimer(0) 48 , m_repetitionCount(cAnimationNone) 49 , m_repetitionCountStatus(Unknown) 50 , m_repetitionsComplete(0) 51 , m_desiredFrameStartTime(0) 52 , m_decodedSize(0) 53 , m_decodedPropertiesSize(0) 54 , m_frameCount(0) 55 , m_isSolidColor(false) 56 , m_checkedForSolidColor(false) 57 , m_animationFinished(false) 58 , m_allDataReceived(false) 59 , m_haveSize(false) 60 , m_sizeAvailable(false) 61 , m_hasUniformFrameSize(true) 62 , m_haveFrameCount(false) 63 { 64 } 65 66 BitmapImage::BitmapImage(PassRefPtr<NativeImageSkia> nativeImage, ImageObserver* observer) 67 : Image(observer) 68 , m_size(nativeImage->bitmap().width(), nativeImage->bitmap().height()) 69 , m_currentFrame(0) 70 , m_frames(0) 71 , m_frameTimer(0) 72 , m_repetitionCount(cAnimationNone) 73 , m_repetitionCountStatus(Unknown) 74 , m_repetitionsComplete(0) 75 , m_decodedSize(nativeImage->decodedSize()) 76 , m_decodedPropertiesSize(0) 77 , m_frameCount(1) 78 , m_isSolidColor(false) 79 , m_checkedForSolidColor(false) 80 , m_animationFinished(true) 81 , m_allDataReceived(true) 82 , m_haveSize(true) 83 , m_sizeAvailable(true) 84 , m_haveFrameCount(true) 85 { 86 // Since we don't have a decoder, we can't figure out the image orientation. 87 // Set m_sizeRespectingOrientation to be the same as m_size so it's not 0x0. 88 m_sizeRespectingOrientation = m_size; 89 90 m_frames.grow(1); 91 m_frames[0].m_hasAlpha = !nativeImage->bitmap().isOpaque(); 92 m_frames[0].m_frame = nativeImage; 93 m_frames[0].m_haveMetadata = true; 94 95 checkForSolidColor(); 96 } 97 98 BitmapImage::~BitmapImage() 99 { 100 stopAnimation(); 101 } 102 103 bool BitmapImage::isBitmapImage() const 104 { 105 return true; 106 } 107 108 bool BitmapImage::hasSingleSecurityOrigin() const 109 { 110 return true; 111 } 112 113 114 void BitmapImage::destroyDecodedData(bool destroyAll) 115 { 116 for (size_t i = 0; i < m_frames.size(); ++i) { 117 // The underlying frame isn't actually changing (we're just trying to 118 // save the memory for the framebuffer data), so we don't need to clear 119 // the metadata. 120 m_frames[i].clear(false); 121 } 122 123 destroyMetadataAndNotify(m_source.clearCacheExceptFrame(destroyAll ? notFound : m_currentFrame)); 124 } 125 126 void BitmapImage::destroyDecodedDataIfNecessary() 127 { 128 // Animated images >5MB are considered large enough that we'll only hang on 129 // to one frame at a time. 130 static const size_t cLargeAnimationCutoff = 5242880; 131 size_t allFrameBytes = 0; 132 for (size_t i = 0; i < m_frames.size(); ++i) 133 allFrameBytes += m_frames[i].m_frameBytes; 134 135 if (allFrameBytes > cLargeAnimationCutoff) 136 destroyDecodedData(false); 137 } 138 139 void BitmapImage::destroyMetadataAndNotify(size_t frameBytesCleared) 140 { 141 m_isSolidColor = false; 142 m_checkedForSolidColor = false; 143 144 ASSERT(m_decodedSize >= frameBytesCleared); 145 m_decodedSize -= frameBytesCleared; 146 if (frameBytesCleared > 0) { 147 frameBytesCleared += m_decodedPropertiesSize; 148 m_decodedPropertiesSize = 0; 149 } 150 if (frameBytesCleared && imageObserver()) 151 imageObserver()->decodedSizeChanged(this, -safeCast<int>(frameBytesCleared)); 152 } 153 154 void BitmapImage::cacheFrame(size_t index) 155 { 156 size_t numFrames = frameCount(); 157 if (m_frames.size() < numFrames) 158 m_frames.grow(numFrames); 159 160 m_frames[index].m_frame = m_source.createFrameAtIndex(index); 161 if (numFrames == 1 && m_frames[index].m_frame) 162 checkForSolidColor(); 163 164 m_frames[index].m_orientation = m_source.orientationAtIndex(index); 165 m_frames[index].m_haveMetadata = true; 166 m_frames[index].m_isComplete = m_source.frameIsCompleteAtIndex(index); 167 if (repetitionCount(false) != cAnimationNone) 168 m_frames[index].m_duration = m_source.frameDurationAtIndex(index); 169 m_frames[index].m_hasAlpha = m_source.frameHasAlphaAtIndex(index); 170 m_frames[index].m_frameBytes = m_source.frameBytesAtIndex(index); 171 172 const IntSize frameSize(index ? m_source.frameSizeAtIndex(index) : m_size); 173 if (frameSize != m_size) 174 m_hasUniformFrameSize = false; 175 if (m_frames[index].m_frame) { 176 int deltaBytes = safeCast<int>(m_frames[index].m_frameBytes); 177 m_decodedSize += deltaBytes; 178 // The fully-decoded frame will subsume the partially decoded data used 179 // to determine image properties. 180 deltaBytes -= m_decodedPropertiesSize; 181 m_decodedPropertiesSize = 0; 182 if (imageObserver()) 183 imageObserver()->decodedSizeChanged(this, deltaBytes); 184 } 185 } 186 187 void BitmapImage::didDecodeProperties() const 188 { 189 if (m_decodedSize) 190 return; 191 size_t updatedSize = m_source.bytesDecodedToDetermineProperties(); 192 if (m_decodedPropertiesSize == updatedSize) 193 return; 194 int deltaBytes = updatedSize - m_decodedPropertiesSize; 195 #if !ASSERT_DISABLED 196 bool overflow = updatedSize > m_decodedPropertiesSize && deltaBytes < 0; 197 bool underflow = updatedSize < m_decodedPropertiesSize && deltaBytes > 0; 198 ASSERT(!overflow && !underflow); 199 #endif 200 m_decodedPropertiesSize = updatedSize; 201 if (imageObserver()) 202 imageObserver()->decodedSizeChanged(this, deltaBytes); 203 } 204 205 void BitmapImage::updateSize() const 206 { 207 if (!m_sizeAvailable || m_haveSize) 208 return; 209 210 m_size = m_source.size(); 211 m_sizeRespectingOrientation = m_source.size(RespectImageOrientation); 212 m_haveSize = true; 213 didDecodeProperties(); 214 } 215 216 IntSize BitmapImage::size() const 217 { 218 updateSize(); 219 return m_size; 220 } 221 222 IntSize BitmapImage::sizeRespectingOrientation() const 223 { 224 updateSize(); 225 return m_sizeRespectingOrientation; 226 } 227 228 IntSize BitmapImage::currentFrameSize() const 229 { 230 if (!m_currentFrame || m_hasUniformFrameSize) 231 return size(); 232 IntSize frameSize = m_source.frameSizeAtIndex(m_currentFrame); 233 didDecodeProperties(); 234 return frameSize; 235 } 236 237 bool BitmapImage::getHotSpot(IntPoint& hotSpot) const 238 { 239 bool result = m_source.getHotSpot(hotSpot); 240 didDecodeProperties(); 241 return result; 242 } 243 244 bool BitmapImage::dataChanged(bool allDataReceived) 245 { 246 // Clear all partially-decoded frames. For most image formats, there is only 247 // one frame, but at least GIF and ICO can have more. With GIFs, the frames 248 // come in order and we ask to decode them in order, waiting to request a 249 // subsequent frame until the prior one is complete. Given that we clear 250 // incomplete frames here, this means there is at most one incomplete frame 251 // (even if we use destroyDecodedData() -- since it doesn't reset the 252 // metadata), and it is after all the complete frames. 253 // 254 // With ICOs, on the other hand, we may ask for arbitrary frames at 255 // different times (e.g. because we're displaying a higher-resolution image 256 // in the content area and using a lower-resolution one for the favicon), 257 // and the frames aren't even guaranteed to appear in the file in the same 258 // order as in the directory, so an arbitrary number of the frames might be 259 // incomplete (if we ask for frames for which we've not yet reached the 260 // start of the frame data), and any or none of them might be the particular 261 // frame affected by appending new data here. Thus we have to clear all the 262 // incomplete frames to be safe. 263 unsigned frameBytesCleared = 0; 264 for (size_t i = 0; i < m_frames.size(); ++i) { 265 // NOTE: Don't call frameIsCompleteAtIndex() here, that will try to 266 // decode any uncached (i.e. never-decoded or 267 // cleared-on-a-previous-pass) frames! 268 unsigned frameBytes = m_frames[i].m_frameBytes; 269 if (m_frames[i].m_haveMetadata && !m_frames[i].m_isComplete) 270 frameBytesCleared += (m_frames[i].clear(true) ? frameBytes : 0); 271 } 272 destroyMetadataAndNotify(frameBytesCleared); 273 274 // Feed all the data we've seen so far to the image decoder. 275 m_allDataReceived = allDataReceived; 276 m_source.setData(data(), allDataReceived); 277 278 m_haveFrameCount = false; 279 m_hasUniformFrameSize = true; 280 return isSizeAvailable(); 281 } 282 283 String BitmapImage::filenameExtension() const 284 { 285 return m_source.filenameExtension(); 286 } 287 288 void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, BlendMode blendMode) 289 { 290 draw(ctxt, dstRect, srcRect, compositeOp, blendMode, DoNotRespectImageOrientation); 291 } 292 293 void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, BlendMode blendMode, RespectImageOrientationEnum shouldRespectImageOrientation) 294 { 295 // Spin the animation to the correct frame before we try to draw it, so we 296 // don't draw an old frame and then immediately need to draw a newer one, 297 // causing flicker and wasting CPU. 298 startAnimation(); 299 300 RefPtr<NativeImageSkia> bm = nativeImageForCurrentFrame(); 301 if (!bm) 302 return; // It's too early and we don't have an image yet. 303 304 FloatRect normDstRect = adjustForNegativeSize(dstRect); 305 FloatRect normSrcRect = adjustForNegativeSize(srcRect); 306 normSrcRect.intersect(FloatRect(0, 0, bm->bitmap().width(), bm->bitmap().height())); 307 308 if (normSrcRect.isEmpty() || normDstRect.isEmpty()) 309 return; // Nothing to draw. 310 311 ImageOrientation orientation = DefaultImageOrientation; 312 if (shouldRespectImageOrientation == RespectImageOrientation) 313 orientation = frameOrientationAtIndex(m_currentFrame); 314 315 GraphicsContextStateSaver saveContext(*ctxt, false); 316 if (orientation != DefaultImageOrientation) { 317 saveContext.save(); 318 319 // ImageOrientation expects the origin to be at (0, 0) 320 ctxt->translate(normDstRect.x(), normDstRect.y()); 321 normDstRect.setLocation(FloatPoint()); 322 323 ctxt->concatCTM(orientation.transformFromDefault(normDstRect.size())); 324 325 if (orientation.usesWidthAsHeight()) { 326 // The destination rect will have it's width and height already reversed for the orientation of 327 // the image, as it was needed for page layout, so we need to reverse it back here. 328 normDstRect = FloatRect(normDstRect.x(), normDstRect.y(), normDstRect.height(), normDstRect.width()); 329 } 330 } 331 332 bm->draw(ctxt, normSrcRect, normDstRect, WebCoreCompositeToSkiaComposite(compositeOp, blendMode)); 333 334 if (ImageObserver* observer = imageObserver()) 335 observer->didDraw(this); 336 } 337 338 size_t BitmapImage::frameCount() 339 { 340 if (!m_haveFrameCount) { 341 m_frameCount = m_source.frameCount(); 342 // If decoder is not initialized yet, m_source.frameCount() returns 0. 343 if (m_frameCount) { 344 didDecodeProperties(); 345 m_haveFrameCount = true; 346 } 347 } 348 return m_frameCount; 349 } 350 351 bool BitmapImage::isSizeAvailable() 352 { 353 if (m_sizeAvailable) 354 return true; 355 356 m_sizeAvailable = m_source.isSizeAvailable(); 357 didDecodeProperties(); 358 359 return m_sizeAvailable; 360 } 361 362 bool BitmapImage::ensureFrameIsCached(size_t index) 363 { 364 if (index >= frameCount()) 365 return false; 366 367 if (index >= m_frames.size() || !m_frames[index].m_frame) 368 cacheFrame(index); 369 return true; 370 } 371 372 PassRefPtr<NativeImageSkia> BitmapImage::frameAtIndex(size_t index) 373 { 374 if (!ensureFrameIsCached(index)) 375 return 0; 376 return m_frames[index].m_frame; 377 } 378 379 bool BitmapImage::frameIsCompleteAtIndex(size_t index) 380 { 381 if (index < m_frames.size() && m_frames[index].m_haveMetadata && m_frames[index].m_isComplete) 382 return true; 383 return m_source.frameIsCompleteAtIndex(index); 384 } 385 386 float BitmapImage::frameDurationAtIndex(size_t index) 387 { 388 if (index < m_frames.size() && m_frames[index].m_haveMetadata) 389 return m_frames[index].m_duration; 390 return m_source.frameDurationAtIndex(index); 391 } 392 393 PassRefPtr<NativeImageSkia> BitmapImage::nativeImageForCurrentFrame() 394 { 395 return frameAtIndex(currentFrame()); 396 } 397 398 bool BitmapImage::frameHasAlphaAtIndex(size_t index) 399 { 400 if (m_frames.size() <= index) 401 return true; 402 403 if (m_frames[index].m_haveMetadata) 404 return m_frames[index].m_hasAlpha; 405 406 return m_source.frameHasAlphaAtIndex(index); 407 } 408 409 bool BitmapImage::currentFrameKnownToBeOpaque() 410 { 411 return !frameHasAlphaAtIndex(currentFrame()); 412 } 413 414 ImageOrientation BitmapImage::currentFrameOrientation() 415 { 416 return frameOrientationAtIndex(currentFrame()); 417 } 418 419 ImageOrientation BitmapImage::frameOrientationAtIndex(size_t index) 420 { 421 if (m_frames.size() <= index) 422 return DefaultImageOrientation; 423 424 if (m_frames[index].m_haveMetadata) 425 return m_frames[index].m_orientation; 426 427 return m_source.orientationAtIndex(index); 428 } 429 430 #if !ASSERT_DISABLED 431 bool BitmapImage::notSolidColor() 432 { 433 return size().width() != 1 || size().height() != 1 || frameCount() > 1; 434 } 435 #endif 436 437 438 439 int BitmapImage::repetitionCount(bool imageKnownToBeComplete) 440 { 441 if ((m_repetitionCountStatus == Unknown) || ((m_repetitionCountStatus == Uncertain) && imageKnownToBeComplete)) { 442 // Snag the repetition count. If |imageKnownToBeComplete| is false, the 443 // repetition count may not be accurate yet for GIFs; in this case the 444 // decoder will default to cAnimationLoopOnce, and we'll try and read 445 // the count again once the whole image is decoded. 446 m_repetitionCount = m_source.repetitionCount(); 447 didDecodeProperties(); 448 m_repetitionCountStatus = (imageKnownToBeComplete || m_repetitionCount == cAnimationNone) ? Certain : Uncertain; 449 } 450 return m_repetitionCount; 451 } 452 453 bool BitmapImage::shouldAnimate() 454 { 455 return (repetitionCount(false) != cAnimationNone && !m_animationFinished && imageObserver()); 456 } 457 458 void BitmapImage::startAnimation(bool catchUpIfNecessary) 459 { 460 if (m_frameTimer || !shouldAnimate() || frameCount() <= 1) 461 return; 462 463 // If we aren't already animating, set now as the animation start time. 464 const double time = monotonicallyIncreasingTime(); 465 if (!m_desiredFrameStartTime) 466 m_desiredFrameStartTime = time; 467 468 // Don't advance the animation to an incomplete frame. 469 size_t nextFrame = (m_currentFrame + 1) % frameCount(); 470 if (!m_allDataReceived && !frameIsCompleteAtIndex(nextFrame)) 471 return; 472 473 // Don't advance past the last frame if we haven't decoded the whole image 474 // yet and our repetition count is potentially unset. The repetition count 475 // in a GIF can potentially come after all the rest of the image data, so 476 // wait on it. 477 if (!m_allDataReceived && repetitionCount(false) == cAnimationLoopOnce && m_currentFrame >= (frameCount() - 1)) 478 return; 479 480 // Determine time for next frame to start. By ignoring paint and timer lag 481 // in this calculation, we make the animation appear to run at its desired 482 // rate regardless of how fast it's being repainted. 483 const double currentDuration = frameDurationAtIndex(m_currentFrame); 484 m_desiredFrameStartTime += currentDuration; 485 486 // When an animated image is more than five minutes out of date, the 487 // user probably doesn't care about resyncing and we could burn a lot of 488 // time looping through frames below. Just reset the timings. 489 const double cAnimationResyncCutoff = 5 * 60; 490 if ((time - m_desiredFrameStartTime) > cAnimationResyncCutoff) 491 m_desiredFrameStartTime = time + currentDuration; 492 493 // The image may load more slowly than it's supposed to animate, so that by 494 // the time we reach the end of the first repetition, we're well behind. 495 // Clamp the desired frame start time in this case, so that we don't skip 496 // frames (or whole iterations) trying to "catch up". This is a tradeoff: 497 // It guarantees users see the whole animation the second time through and 498 // don't miss any repetitions, and is closer to what other browsers do; on 499 // the other hand, it makes animations "less accurate" for pages that try to 500 // sync an image and some other resource (e.g. audio), especially if users 501 // switch tabs (and thus stop drawing the animation, which will pause it) 502 // during that initial loop, then switch back later. 503 if (nextFrame == 0 && m_repetitionsComplete == 0 && m_desiredFrameStartTime < time) 504 m_desiredFrameStartTime = time; 505 506 if (!catchUpIfNecessary || time < m_desiredFrameStartTime) { 507 // Haven't yet reached time for next frame to start; delay until then. 508 m_frameTimer = new Timer<BitmapImage>(this, &BitmapImage::advanceAnimation); 509 m_frameTimer->startOneShot(std::max(m_desiredFrameStartTime - time, 0.)); 510 } else { 511 // We've already reached or passed the time for the next frame to start. 512 // See if we've also passed the time for frames after that to start, in 513 // case we need to skip some frames entirely. Remember not to advance 514 // to an incomplete frame. 515 for (size_t frameAfterNext = (nextFrame + 1) % frameCount(); frameIsCompleteAtIndex(frameAfterNext); frameAfterNext = (nextFrame + 1) % frameCount()) { 516 // Should we skip the next frame? 517 double frameAfterNextStartTime = m_desiredFrameStartTime + frameDurationAtIndex(nextFrame); 518 if (time < frameAfterNextStartTime) 519 break; 520 521 // Yes; skip over it without notifying our observers. 522 if (!internalAdvanceAnimation(true)) 523 return; 524 m_desiredFrameStartTime = frameAfterNextStartTime; 525 nextFrame = frameAfterNext; 526 } 527 528 // Draw the next frame immediately. Note that m_desiredFrameStartTime 529 // may be in the past, meaning the next time through this function we'll 530 // kick off the next advancement sooner than this frame's duration would 531 // suggest. 532 if (internalAdvanceAnimation(false)) { 533 // The image region has been marked dirty, but once we return to our 534 // caller, draw() will clear it, and nothing will cause the 535 // animation to advance again. We need to start the timer for the 536 // next frame running, or the animation can hang. (Compare this 537 // with when advanceAnimation() is called, and the region is dirtied 538 // while draw() is not in the callstack, meaning draw() gets called 539 // to update the region and thus startAnimation() is reached again.) 540 // NOTE: For large images with slow or heavily-loaded systems, 541 // throwing away data as we go (see destroyDecodedData()) means we 542 // can spend so much time re-decoding data above that by the time we 543 // reach here we're behind again. If we let startAnimation() run 544 // the catch-up code again, we can get long delays without painting 545 // as we race the timer, or even infinite recursion. In this 546 // situation the best we can do is to simply change frames as fast 547 // as possible, so force startAnimation() to set a zero-delay timer 548 // and bail out if we're not caught up. 549 startAnimation(false); 550 } 551 } 552 } 553 554 void BitmapImage::stopAnimation() 555 { 556 // This timer is used to animate all occurrences of this image. Don't invalidate 557 // the timer unless all renderers have stopped drawing. 558 delete m_frameTimer; 559 m_frameTimer = 0; 560 } 561 562 void BitmapImage::resetAnimation() 563 { 564 stopAnimation(); 565 m_currentFrame = 0; 566 m_repetitionsComplete = 0; 567 m_desiredFrameStartTime = 0; 568 m_animationFinished = false; 569 570 // For extremely large animations, when the animation is reset, we just throw everything away. 571 destroyDecodedDataIfNecessary(); 572 } 573 574 unsigned BitmapImage::decodedSize() const 575 { 576 return m_decodedSize; 577 } 578 579 580 581 void BitmapImage::advanceAnimation(Timer<BitmapImage>*) 582 { 583 internalAdvanceAnimation(false); 584 // At this point the image region has been marked dirty, and if it's 585 // onscreen, we'll soon make a call to draw(), which will call 586 // startAnimation() again to keep the animation moving. 587 } 588 589 bool BitmapImage::internalAdvanceAnimation(bool skippingFrames) 590 { 591 // Stop the animation. 592 stopAnimation(); 593 594 // See if anyone is still paying attention to this animation. If not, we don't 595 // advance and will remain suspended at the current frame until the animation is resumed. 596 if (!skippingFrames && imageObserver()->shouldPauseAnimation(this)) 597 return false; 598 599 ++m_currentFrame; 600 bool advancedAnimation = true; 601 if (m_currentFrame >= frameCount()) { 602 ++m_repetitionsComplete; 603 604 // Get the repetition count again. If we weren't able to get a 605 // repetition count before, we should have decoded the whole image by 606 // now, so it should now be available. 607 // Note that we don't need to special-case cAnimationLoopOnce here 608 // because it is 0 (see comments on its declaration in ImageSource.h). 609 if (repetitionCount(true) != cAnimationLoopInfinite && m_repetitionsComplete > m_repetitionCount) { 610 m_animationFinished = true; 611 m_desiredFrameStartTime = 0; 612 --m_currentFrame; 613 advancedAnimation = false; 614 } else 615 m_currentFrame = 0; 616 } 617 destroyDecodedDataIfNecessary(); 618 619 // We need to draw this frame if we advanced to it while not skipping, or if 620 // while trying to skip frames we hit the last frame and thus had to stop. 621 if (skippingFrames != advancedAnimation) 622 imageObserver()->animationAdvanced(this); 623 return advancedAnimation; 624 } 625 626 void BitmapImage::checkForSolidColor() 627 { 628 m_isSolidColor = false; 629 m_checkedForSolidColor = true; 630 631 if (frameCount() > 1) 632 return; 633 634 RefPtr<NativeImageSkia> frame = frameAtIndex(0); 635 636 if (frame && size().width() == 1 && size().height() == 1) { 637 SkAutoLockPixels lock(frame->bitmap()); 638 if (!frame->bitmap().getPixels()) 639 return; 640 641 m_isSolidColor = true; 642 m_solidColor = Color(frame->bitmap().getColor(0, 0)); 643 } 644 } 645 646 bool BitmapImage::mayFillWithSolidColor() 647 { 648 if (!m_checkedForSolidColor && frameCount() > 0) { 649 checkForSolidColor(); 650 ASSERT(m_checkedForSolidColor); 651 } 652 return m_isSolidColor && !m_currentFrame; 653 } 654 655 Color BitmapImage::solidColor() const 656 { 657 return m_solidColor; 658 } 659 660 } 661