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 "platform/graphics/BitmapImage.h" 29 30 #include "platform/Timer.h" 31 #include "platform/TraceEvent.h" 32 #include "platform/geometry/FloatRect.h" 33 #include "platform/graphics/GraphicsContextStateSaver.h" 34 #include "platform/graphics/ImageObserver.h" 35 #include "platform/graphics/skia/NativeImageSkia.h" 36 #include "platform/graphics/skia/SkiaUtils.h" 37 #include "wtf/CurrentTime.h" 38 #include "wtf/PassRefPtr.h" 39 #include "wtf/Vector.h" 40 #include "wtf/text/WTFString.h" 41 42 namespace WebCore { 43 44 BitmapImage::BitmapImage(ImageObserver* observer) 45 : Image(observer) 46 , m_currentFrame(0) 47 , m_frames(0) 48 , m_frameTimer(0) 49 , m_repetitionCount(cAnimationNone) 50 , m_repetitionCountStatus(Unknown) 51 , m_repetitionsComplete(0) 52 , m_desiredFrameStartTime(0) 53 , m_frameCount(0) 54 , m_isSolidColor(false) 55 , m_checkedForSolidColor(false) 56 , m_animationFinished(false) 57 , m_allDataReceived(false) 58 , m_haveSize(false) 59 , m_sizeAvailable(false) 60 , m_hasUniformFrameSize(true) 61 , m_haveFrameCount(false) 62 { 63 } 64 65 BitmapImage::BitmapImage(PassRefPtr<NativeImageSkia> nativeImage, ImageObserver* observer) 66 : Image(observer) 67 , m_size(nativeImage->bitmap().width(), nativeImage->bitmap().height()) 68 , m_currentFrame(0) 69 , m_frames(0) 70 , m_frameTimer(0) 71 , m_repetitionCount(cAnimationNone) 72 , m_repetitionCountStatus(Unknown) 73 , m_repetitionsComplete(0) 74 , m_frameCount(1) 75 , m_isSolidColor(false) 76 , m_checkedForSolidColor(false) 77 , m_animationFinished(true) 78 , m_allDataReceived(true) 79 , m_haveSize(true) 80 , m_sizeAvailable(true) 81 , m_haveFrameCount(true) 82 { 83 // Since we don't have a decoder, we can't figure out the image orientation. 84 // Set m_sizeRespectingOrientation to be the same as m_size so it's not 0x0. 85 m_sizeRespectingOrientation = m_size; 86 87 m_frames.grow(1); 88 m_frames[0].m_hasAlpha = !nativeImage->bitmap().isOpaque(); 89 m_frames[0].m_frame = nativeImage; 90 m_frames[0].m_haveMetadata = true; 91 92 checkForSolidColor(); 93 } 94 95 BitmapImage::~BitmapImage() 96 { 97 stopAnimation(); 98 } 99 100 bool BitmapImage::isBitmapImage() const 101 { 102 return true; 103 } 104 105 void BitmapImage::destroyDecodedData(bool destroyAll) 106 { 107 for (size_t i = 0; i < m_frames.size(); ++i) { 108 // The underlying frame isn't actually changing (we're just trying to 109 // save the memory for the framebuffer data), so we don't need to clear 110 // the metadata. 111 m_frames[i].clear(false); 112 } 113 114 destroyMetadataAndNotify(m_source.clearCacheExceptFrame(destroyAll ? kNotFound : m_currentFrame)); 115 } 116 117 void BitmapImage::destroyDecodedDataIfNecessary() 118 { 119 // Animated images >5MB are considered large enough that we'll only hang on 120 // to one frame at a time. 121 static const size_t cLargeAnimationCutoff = 5242880; 122 size_t allFrameBytes = 0; 123 for (size_t i = 0; i < m_frames.size(); ++i) 124 allFrameBytes += m_frames[i].m_frameBytes; 125 126 if (allFrameBytes > cLargeAnimationCutoff) 127 destroyDecodedData(false); 128 } 129 130 void BitmapImage::destroyMetadataAndNotify(size_t frameBytesCleared) 131 { 132 m_isSolidColor = false; 133 m_checkedForSolidColor = false; 134 135 if (frameBytesCleared && imageObserver()) 136 imageObserver()->decodedSizeChanged(this, -safeCast<int>(frameBytesCleared)); 137 } 138 139 void BitmapImage::cacheFrame(size_t index) 140 { 141 size_t numFrames = frameCount(); 142 if (m_frames.size() < numFrames) 143 m_frames.grow(numFrames); 144 145 m_frames[index].m_frame = m_source.createFrameAtIndex(index); 146 if (numFrames == 1 && m_frames[index].m_frame) 147 checkForSolidColor(); 148 149 m_frames[index].m_orientation = m_source.orientationAtIndex(index); 150 m_frames[index].m_haveMetadata = true; 151 m_frames[index].m_isComplete = m_source.frameIsCompleteAtIndex(index); 152 if (repetitionCount(false) != cAnimationNone) 153 m_frames[index].m_duration = m_source.frameDurationAtIndex(index); 154 m_frames[index].m_hasAlpha = m_source.frameHasAlphaAtIndex(index); 155 m_frames[index].m_frameBytes = m_source.frameBytesAtIndex(index); 156 157 const IntSize frameSize(index ? m_source.frameSizeAtIndex(index) : m_size); 158 if (frameSize != m_size) 159 m_hasUniformFrameSize = false; 160 if (m_frames[index].m_frame) { 161 int deltaBytes = safeCast<int>(m_frames[index].m_frameBytes); 162 // The fully-decoded frame will subsume the partially decoded data used 163 // to determine image properties. 164 if (imageObserver()) 165 imageObserver()->decodedSizeChanged(this, deltaBytes); 166 } 167 } 168 169 void BitmapImage::updateSize() const 170 { 171 if (!m_sizeAvailable || m_haveSize) 172 return; 173 174 m_size = m_source.size(); 175 m_sizeRespectingOrientation = m_source.size(RespectImageOrientation); 176 m_haveSize = true; 177 } 178 179 IntSize BitmapImage::size() const 180 { 181 updateSize(); 182 return m_size; 183 } 184 185 IntSize BitmapImage::sizeRespectingOrientation() const 186 { 187 updateSize(); 188 return m_sizeRespectingOrientation; 189 } 190 191 IntSize BitmapImage::currentFrameSize() const 192 { 193 if (!m_currentFrame || m_hasUniformFrameSize) 194 return size(); 195 IntSize frameSize = m_source.frameSizeAtIndex(m_currentFrame); 196 return frameSize; 197 } 198 199 bool BitmapImage::getHotSpot(IntPoint& hotSpot) const 200 { 201 bool result = m_source.getHotSpot(hotSpot); 202 return result; 203 } 204 205 bool BitmapImage::dataChanged(bool allDataReceived) 206 { 207 TRACE_EVENT0("webkit", "BitmapImage::dataChanged"); 208 209 // Clear all partially-decoded frames. For most image formats, there is only 210 // one frame, but at least GIF and ICO can have more. With GIFs, the frames 211 // come in order and we ask to decode them in order, waiting to request a 212 // subsequent frame until the prior one is complete. Given that we clear 213 // incomplete frames here, this means there is at most one incomplete frame 214 // (even if we use destroyDecodedData() -- since it doesn't reset the 215 // metadata), and it is after all the complete frames. 216 // 217 // With ICOs, on the other hand, we may ask for arbitrary frames at 218 // different times (e.g. because we're displaying a higher-resolution image 219 // in the content area and using a lower-resolution one for the favicon), 220 // and the frames aren't even guaranteed to appear in the file in the same 221 // order as in the directory, so an arbitrary number of the frames might be 222 // incomplete (if we ask for frames for which we've not yet reached the 223 // start of the frame data), and any or none of them might be the particular 224 // frame affected by appending new data here. Thus we have to clear all the 225 // incomplete frames to be safe. 226 unsigned frameBytesCleared = 0; 227 for (size_t i = 0; i < m_frames.size(); ++i) { 228 // NOTE: Don't call frameIsCompleteAtIndex() here, that will try to 229 // decode any uncached (i.e. never-decoded or 230 // cleared-on-a-previous-pass) frames! 231 unsigned frameBytes = m_frames[i].m_frameBytes; 232 if (m_frames[i].m_haveMetadata && !m_frames[i].m_isComplete) 233 frameBytesCleared += (m_frames[i].clear(true) ? frameBytes : 0); 234 } 235 destroyMetadataAndNotify(frameBytesCleared); 236 237 // Feed all the data we've seen so far to the image decoder. 238 m_allDataReceived = allDataReceived; 239 ASSERT(data()); 240 m_source.setData(*data(), allDataReceived); 241 242 m_haveFrameCount = false; 243 m_hasUniformFrameSize = true; 244 return isSizeAvailable(); 245 } 246 247 bool BitmapImage::isAllDataReceived() const 248 { 249 return m_allDataReceived; 250 } 251 252 bool BitmapImage::hasColorProfile() const 253 { 254 return m_source.hasColorProfile(); 255 } 256 257 String BitmapImage::filenameExtension() const 258 { 259 return m_source.filenameExtension(); 260 } 261 262 void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, blink::WebBlendMode blendMode) 263 { 264 draw(ctxt, dstRect, srcRect, compositeOp, blendMode, DoNotRespectImageOrientation); 265 } 266 267 void BitmapImage::draw(GraphicsContext* ctxt, const FloatRect& dstRect, const FloatRect& srcRect, CompositeOperator compositeOp, blink::WebBlendMode blendMode, RespectImageOrientationEnum shouldRespectImageOrientation) 268 { 269 // Spin the animation to the correct frame before we try to draw it, so we 270 // don't draw an old frame and then immediately need to draw a newer one, 271 // causing flicker and wasting CPU. 272 startAnimation(); 273 274 RefPtr<NativeImageSkia> bm = nativeImageForCurrentFrame(); 275 if (!bm) 276 return; // It's too early and we don't have an image yet. 277 278 FloatRect normDstRect = adjustForNegativeSize(dstRect); 279 FloatRect normSrcRect = adjustForNegativeSize(srcRect); 280 normSrcRect.intersect(FloatRect(0, 0, bm->bitmap().width(), bm->bitmap().height())); 281 282 if (normSrcRect.isEmpty() || normDstRect.isEmpty()) 283 return; // Nothing to draw. 284 285 ImageOrientation orientation = DefaultImageOrientation; 286 if (shouldRespectImageOrientation == RespectImageOrientation) 287 orientation = frameOrientationAtIndex(m_currentFrame); 288 289 GraphicsContextStateSaver saveContext(*ctxt, false); 290 if (orientation != DefaultImageOrientation) { 291 saveContext.save(); 292 293 // ImageOrientation expects the origin to be at (0, 0) 294 ctxt->translate(normDstRect.x(), normDstRect.y()); 295 normDstRect.setLocation(FloatPoint()); 296 297 ctxt->concatCTM(orientation.transformFromDefault(normDstRect.size())); 298 299 if (orientation.usesWidthAsHeight()) { 300 // The destination rect will have it's width and height already reversed for the orientation of 301 // the image, as it was needed for page layout, so we need to reverse it back here. 302 normDstRect = FloatRect(normDstRect.x(), normDstRect.y(), normDstRect.height(), normDstRect.width()); 303 } 304 } 305 306 bm->draw(ctxt, normSrcRect, normDstRect, WebCoreCompositeToSkiaComposite(compositeOp, blendMode)); 307 308 if (ImageObserver* observer = imageObserver()) 309 observer->didDraw(this); 310 } 311 312 size_t BitmapImage::frameCount() 313 { 314 if (!m_haveFrameCount) { 315 m_frameCount = m_source.frameCount(); 316 // If decoder is not initialized yet, m_source.frameCount() returns 0. 317 if (m_frameCount) { 318 m_haveFrameCount = true; 319 } 320 } 321 return m_frameCount; 322 } 323 324 bool BitmapImage::isSizeAvailable() 325 { 326 if (m_sizeAvailable) 327 return true; 328 329 m_sizeAvailable = m_source.isSizeAvailable(); 330 331 return m_sizeAvailable; 332 } 333 334 bool BitmapImage::ensureFrameIsCached(size_t index) 335 { 336 if (index >= frameCount()) 337 return false; 338 339 if (index >= m_frames.size() || !m_frames[index].m_frame) 340 cacheFrame(index); 341 return true; 342 } 343 344 PassRefPtr<NativeImageSkia> BitmapImage::frameAtIndex(size_t index) 345 { 346 if (!ensureFrameIsCached(index)) 347 return nullptr; 348 return m_frames[index].m_frame; 349 } 350 351 bool BitmapImage::frameIsCompleteAtIndex(size_t index) 352 { 353 if (index < m_frames.size() && m_frames[index].m_haveMetadata && m_frames[index].m_isComplete) 354 return true; 355 return m_source.frameIsCompleteAtIndex(index); 356 } 357 358 float BitmapImage::frameDurationAtIndex(size_t index) 359 { 360 if (index < m_frames.size() && m_frames[index].m_haveMetadata) 361 return m_frames[index].m_duration; 362 return m_source.frameDurationAtIndex(index); 363 } 364 365 PassRefPtr<NativeImageSkia> BitmapImage::nativeImageForCurrentFrame() 366 { 367 return frameAtIndex(currentFrame()); 368 } 369 370 bool BitmapImage::frameHasAlphaAtIndex(size_t index) 371 { 372 if (m_frames.size() <= index) 373 return true; 374 375 if (m_frames[index].m_haveMetadata) 376 return m_frames[index].m_hasAlpha; 377 378 return m_source.frameHasAlphaAtIndex(index); 379 } 380 381 bool BitmapImage::currentFrameKnownToBeOpaque() 382 { 383 return !frameHasAlphaAtIndex(currentFrame()); 384 } 385 386 ImageOrientation BitmapImage::currentFrameOrientation() 387 { 388 return frameOrientationAtIndex(currentFrame()); 389 } 390 391 ImageOrientation BitmapImage::frameOrientationAtIndex(size_t index) 392 { 393 if (m_frames.size() <= index) 394 return DefaultImageOrientation; 395 396 if (m_frames[index].m_haveMetadata) 397 return m_frames[index].m_orientation; 398 399 return m_source.orientationAtIndex(index); 400 } 401 402 #if ASSERT_ENABLED 403 bool BitmapImage::notSolidColor() 404 { 405 return size().width() != 1 || size().height() != 1 || frameCount() > 1; 406 } 407 #endif 408 409 410 411 int BitmapImage::repetitionCount(bool imageKnownToBeComplete) 412 { 413 if ((m_repetitionCountStatus == Unknown) || ((m_repetitionCountStatus == Uncertain) && imageKnownToBeComplete)) { 414 // Snag the repetition count. If |imageKnownToBeComplete| is false, the 415 // repetition count may not be accurate yet for GIFs; in this case the 416 // decoder will default to cAnimationLoopOnce, and we'll try and read 417 // the count again once the whole image is decoded. 418 m_repetitionCount = m_source.repetitionCount(); 419 m_repetitionCountStatus = (imageKnownToBeComplete || m_repetitionCount == cAnimationNone) ? Certain : Uncertain; 420 } 421 return m_repetitionCount; 422 } 423 424 bool BitmapImage::shouldAnimate() 425 { 426 return (repetitionCount(false) != cAnimationNone && !m_animationFinished && imageObserver()); 427 } 428 429 void BitmapImage::startAnimation(CatchUpAnimation catchUpIfNecessary) 430 { 431 if (m_frameTimer || !shouldAnimate() || frameCount() <= 1) 432 return; 433 434 // If we aren't already animating, set now as the animation start time. 435 const double time = monotonicallyIncreasingTime(); 436 if (!m_desiredFrameStartTime) 437 m_desiredFrameStartTime = time; 438 439 // Don't advance the animation to an incomplete frame. 440 size_t nextFrame = (m_currentFrame + 1) % frameCount(); 441 if (!m_allDataReceived && !frameIsCompleteAtIndex(nextFrame)) 442 return; 443 444 // Don't advance past the last frame if we haven't decoded the whole image 445 // yet and our repetition count is potentially unset. The repetition count 446 // in a GIF can potentially come after all the rest of the image data, so 447 // wait on it. 448 if (!m_allDataReceived && repetitionCount(false) == cAnimationLoopOnce && m_currentFrame >= (frameCount() - 1)) 449 return; 450 451 // Determine time for next frame to start. By ignoring paint and timer lag 452 // in this calculation, we make the animation appear to run at its desired 453 // rate regardless of how fast it's being repainted. 454 const double currentDuration = frameDurationAtIndex(m_currentFrame); 455 m_desiredFrameStartTime += currentDuration; 456 457 // When an animated image is more than five minutes out of date, the 458 // user probably doesn't care about resyncing and we could burn a lot of 459 // time looping through frames below. Just reset the timings. 460 const double cAnimationResyncCutoff = 5 * 60; 461 if ((time - m_desiredFrameStartTime) > cAnimationResyncCutoff) 462 m_desiredFrameStartTime = time + currentDuration; 463 464 // The image may load more slowly than it's supposed to animate, so that by 465 // the time we reach the end of the first repetition, we're well behind. 466 // Clamp the desired frame start time in this case, so that we don't skip 467 // frames (or whole iterations) trying to "catch up". This is a tradeoff: 468 // It guarantees users see the whole animation the second time through and 469 // don't miss any repetitions, and is closer to what other browsers do; on 470 // the other hand, it makes animations "less accurate" for pages that try to 471 // sync an image and some other resource (e.g. audio), especially if users 472 // switch tabs (and thus stop drawing the animation, which will pause it) 473 // during that initial loop, then switch back later. 474 if (nextFrame == 0 && m_repetitionsComplete == 0 && m_desiredFrameStartTime < time) 475 m_desiredFrameStartTime = time; 476 477 if (catchUpIfNecessary == DoNotCatchUp || time < m_desiredFrameStartTime) { 478 // Haven't yet reached time for next frame to start; delay until then. 479 m_frameTimer = new Timer<BitmapImage>(this, &BitmapImage::advanceAnimation); 480 m_frameTimer->startOneShot(std::max(m_desiredFrameStartTime - time, 0.), FROM_HERE); 481 } else { 482 // We've already reached or passed the time for the next frame to start. 483 // See if we've also passed the time for frames after that to start, in 484 // case we need to skip some frames entirely. Remember not to advance 485 // to an incomplete frame. 486 for (size_t frameAfterNext = (nextFrame + 1) % frameCount(); frameIsCompleteAtIndex(frameAfterNext); frameAfterNext = (nextFrame + 1) % frameCount()) { 487 // Should we skip the next frame? 488 double frameAfterNextStartTime = m_desiredFrameStartTime + frameDurationAtIndex(nextFrame); 489 if (time < frameAfterNextStartTime) 490 break; 491 492 // Yes; skip over it without notifying our observers. 493 if (!internalAdvanceAnimation(true)) 494 return; 495 m_desiredFrameStartTime = frameAfterNextStartTime; 496 nextFrame = frameAfterNext; 497 } 498 499 // Draw the next frame immediately. Note that m_desiredFrameStartTime 500 // may be in the past, meaning the next time through this function we'll 501 // kick off the next advancement sooner than this frame's duration would 502 // suggest. 503 if (internalAdvanceAnimation(false)) { 504 // The image region has been marked dirty, but once we return to our 505 // caller, draw() will clear it, and nothing will cause the 506 // animation to advance again. We need to start the timer for the 507 // next frame running, or the animation can hang. (Compare this 508 // with when advanceAnimation() is called, and the region is dirtied 509 // while draw() is not in the callstack, meaning draw() gets called 510 // to update the region and thus startAnimation() is reached again.) 511 // NOTE: For large images with slow or heavily-loaded systems, 512 // throwing away data as we go (see destroyDecodedData()) means we 513 // can spend so much time re-decoding data above that by the time we 514 // reach here we're behind again. If we let startAnimation() run 515 // the catch-up code again, we can get long delays without painting 516 // as we race the timer, or even infinite recursion. In this 517 // situation the best we can do is to simply change frames as fast 518 // as possible, so force startAnimation() to set a zero-delay timer 519 // and bail out if we're not caught up. 520 startAnimation(DoNotCatchUp); 521 } 522 } 523 } 524 525 void BitmapImage::stopAnimation() 526 { 527 // This timer is used to animate all occurrences of this image. Don't invalidate 528 // the timer unless all renderers have stopped drawing. 529 delete m_frameTimer; 530 m_frameTimer = 0; 531 } 532 533 void BitmapImage::resetAnimation() 534 { 535 stopAnimation(); 536 m_currentFrame = 0; 537 m_repetitionsComplete = 0; 538 m_desiredFrameStartTime = 0; 539 m_animationFinished = false; 540 541 // For extremely large animations, when the animation is reset, we just throw everything away. 542 destroyDecodedDataIfNecessary(); 543 } 544 545 bool BitmapImage::maybeAnimated() 546 { 547 if (m_animationFinished) 548 return false; 549 if (frameCount() > 1) 550 return true; 551 return m_source.repetitionCount() != cAnimationNone; 552 } 553 554 void BitmapImage::advanceAnimation(Timer<BitmapImage>*) 555 { 556 internalAdvanceAnimation(false); 557 // At this point the image region has been marked dirty, and if it's 558 // onscreen, we'll soon make a call to draw(), which will call 559 // startAnimation() again to keep the animation moving. 560 } 561 562 bool BitmapImage::internalAdvanceAnimation(bool skippingFrames) 563 { 564 // Stop the animation. 565 stopAnimation(); 566 567 // See if anyone is still paying attention to this animation. If not, we don't 568 // advance and will remain suspended at the current frame until the animation is resumed. 569 if (!skippingFrames && imageObserver()->shouldPauseAnimation(this)) 570 return false; 571 572 ++m_currentFrame; 573 bool advancedAnimation = true; 574 if (m_currentFrame >= frameCount()) { 575 ++m_repetitionsComplete; 576 577 // Get the repetition count again. If we weren't able to get a 578 // repetition count before, we should have decoded the whole image by 579 // now, so it should now be available. 580 // Note that we don't need to special-case cAnimationLoopOnce here 581 // because it is 0 (see comments on its declaration in ImageSource.h). 582 if (repetitionCount(true) != cAnimationLoopInfinite && m_repetitionsComplete > m_repetitionCount) { 583 m_animationFinished = true; 584 m_desiredFrameStartTime = 0; 585 --m_currentFrame; 586 advancedAnimation = false; 587 } else 588 m_currentFrame = 0; 589 } 590 destroyDecodedDataIfNecessary(); 591 592 // We need to draw this frame if we advanced to it while not skipping, or if 593 // while trying to skip frames we hit the last frame and thus had to stop. 594 if (skippingFrames != advancedAnimation) 595 imageObserver()->animationAdvanced(this); 596 return advancedAnimation; 597 } 598 599 void BitmapImage::checkForSolidColor() 600 { 601 m_isSolidColor = false; 602 m_checkedForSolidColor = true; 603 604 if (frameCount() > 1) 605 return; 606 607 RefPtr<NativeImageSkia> frame = frameAtIndex(0); 608 609 if (frame && size().width() == 1 && size().height() == 1) { 610 SkAutoLockPixels lock(frame->bitmap()); 611 if (!frame->bitmap().getPixels()) 612 return; 613 614 m_isSolidColor = true; 615 m_solidColor = Color(frame->bitmap().getColor(0, 0)); 616 } 617 } 618 619 bool BitmapImage::mayFillWithSolidColor() 620 { 621 if (!m_checkedForSolidColor && frameCount() > 0) { 622 checkForSolidColor(); 623 ASSERT(m_checkedForSolidColor); 624 } 625 return m_isSolidColor && !m_currentFrame; 626 } 627 628 Color BitmapImage::solidColor() const 629 { 630 return m_solidColor; 631 } 632 633 } 634