void BitmapImage::advanceAnimation(Timer<BitmapImage>*) { internalAdvanceAnimation(false); // At this point the image region has been marked dirty, and if it's // onscreen, we'll soon make a call to draw(), which will call // startAnimation() again to keep the animation moving. }
void BitmapImage::advanceAnimation(Timer<BitmapImage>* timer) { internalAdvanceAnimation(false); }
void BitmapImage::startAnimation() { if (m_frameTimer || !shouldAnimate() || frameCount() <= 1) return; // Don't advance the animation until the current frame has completely loaded. if (!m_source.frameIsCompleteAtIndex(m_currentFrame)) return; // Don't advance past the last frame if we haven't decoded the whole image // yet and our repetition count is potentially unset. The repetition count // in a GIF can potentially come after all the rest of the image data, so // wait on it. if (!m_allDataReceived && m_repetitionCount == cAnimationLoopOnce && m_currentFrame >= (frameCount() - 1)) return; // Determine time for next frame to start. By ignoring paint and timer lag // in this calculation, we make the animation appear to run at its desired // rate regardless of how fast it's being repainted. const double currentDuration = frameDurationAtIndex(m_currentFrame); const double time = currentTime(); if (!m_desiredFrameStartTime) m_desiredFrameStartTime = time + currentDuration; else { m_desiredFrameStartTime += currentDuration; // If we're too far behind, the user probably doesn't care about // resyncing and we could burn a lot of time looping through frames // below. Just reset the timings. if ((time - m_desiredFrameStartTime) > cAnimationResyncCutoff) m_desiredFrameStartTime = time + currentDuration; } if (time < m_desiredFrameStartTime) { // Haven't yet reached time for next frame to start; delay until then. m_frameTimer = new Timer<BitmapImage>(this, &BitmapImage::advanceAnimation); m_frameTimer->startOneShot(m_desiredFrameStartTime - time); } else { // We've already reached or passed the time for the next frame to start. // See if we've also passed the time for frames after that to start, in // case we need to skip some frames entirely. size_t nextFrame = (m_currentFrame + 1) % frameCount(); while (m_source.frameIsCompleteAtIndex(nextFrame)) { // Should we skip the current frame? double nextFrameStartTime = m_desiredFrameStartTime + frameDurationAtIndex(nextFrame); if (time < nextFrameStartTime) break; // Yes; skip over it without notifying our observers. if (!internalAdvanceAnimation(true)) return; m_desiredFrameStartTime = nextFrameStartTime; nextFrame = (nextFrame + 1) % frameCount(); } // Draw the next frame immediately. Note that m_desiredFrameStartTime // may be in the past, meaning the next time through this function we'll // kick off the next advancement sooner than this frame's duration would // suggest. internalAdvanceAnimation(false); } }
void BitmapImage::startAnimation(bool catchUpIfNecessary) { if (m_frameTimer || !shouldAnimate() || frameCount() <= 1) return; // If we aren't already animating, set now as the animation start time. const double time = monotonicallyIncreasingTime(); if (!m_desiredFrameStartTime) m_desiredFrameStartTime = time; // Don't advance the animation to an incomplete frame. size_t nextFrame = (m_currentFrame + 1) % frameCount(); if (!m_allDataReceived && !frameIsCompleteAtIndex(nextFrame)) return; // Don't advance past the last frame if we haven't decoded the whole image // yet and our repetition count is potentially unset. The repetition count // in a GIF can potentially come after all the rest of the image data, so // wait on it. if (!m_allDataReceived && repetitionCount(false) == cAnimationLoopOnce && m_currentFrame >= (frameCount() - 1)) return; // Determine time for next frame to start. By ignoring paint and timer lag // in this calculation, we make the animation appear to run at its desired // rate regardless of how fast it's being repainted. const double currentDuration = frameDurationAtIndex(m_currentFrame); m_desiredFrameStartTime += currentDuration; // When an animated image is more than five minutes out of date, the // user probably doesn't care about resyncing and we could burn a lot of // time looping through frames below. Just reset the timings. const double cAnimationResyncCutoff = 5 * 60; if ((time - m_desiredFrameStartTime) > cAnimationResyncCutoff) m_desiredFrameStartTime = time + currentDuration; // The image may load more slowly than it's supposed to animate, so that by // the time we reach the end of the first repetition, we're well behind. // Clamp the desired frame start time in this case, so that we don't skip // frames (or whole iterations) trying to "catch up". This is a tradeoff: // It guarantees users see the whole animation the second time through and // don't miss any repetitions, and is closer to what other browsers do; on // the other hand, it makes animations "less accurate" for pages that try to // sync an image and some other resource (e.g. audio), especially if users // switch tabs (and thus stop drawing the animation, which will pause it) // during that initial loop, then switch back later. if (nextFrame == 0 && m_repetitionsComplete == 0 && m_desiredFrameStartTime < time) m_desiredFrameStartTime = time; if (!catchUpIfNecessary || time < m_desiredFrameStartTime) { // Haven't yet reached time for next frame to start; delay until then. m_frameTimer = new Timer<BitmapImage>(this, &BitmapImage::advanceAnimation); m_frameTimer->startOneShot(std::max(m_desiredFrameStartTime - time, 0.)); } else { // We've already reached or passed the time for the next frame to start. // See if we've also passed the time for frames after that to start, in // case we need to skip some frames entirely. Remember not to advance // to an incomplete frame. for (size_t frameAfterNext = (nextFrame + 1) % frameCount(); frameIsCompleteAtIndex(frameAfterNext); frameAfterNext = (nextFrame + 1) % frameCount()) { // Should we skip the next frame? double frameAfterNextStartTime = m_desiredFrameStartTime + frameDurationAtIndex(nextFrame); if (time < frameAfterNextStartTime) break; // Yes; skip over it without notifying our observers. if (!internalAdvanceAnimation(true)) return; m_desiredFrameStartTime = frameAfterNextStartTime; nextFrame = frameAfterNext; } // Draw the next frame immediately. Note that m_desiredFrameStartTime // may be in the past, meaning the next time through this function we'll // kick off the next advancement sooner than this frame's duration would // suggest. if (internalAdvanceAnimation(false)) { // The image region has been marked dirty, but once we return to our // caller, draw() will clear it, and nothing will cause the // animation to advance again. We need to start the timer for the // next frame running, or the animation can hang. (Compare this // with when advanceAnimation() is called, and the region is dirtied // while draw() is not in the callstack, meaning draw() gets called // to update the region and thus startAnimation() is reached again.) // NOTE: For large images with slow or heavily-loaded systems, // throwing away data as we go (see destroyDecodedData()) means we // can spend so much time re-decoding data above that by the time we // reach here we're behind again. If we let startAnimation() run // the catch-up code again, we can get long delays without painting // as we race the timer, or even infinite recursion. In this // situation the best we can do is to simply change frames as fast // as possible, so force startAnimation() to set a zero-delay timer // and bail out if we're not caught up. startAnimation(false); } } }
void BitmapImage::startAnimation(CatchUpAnimation catchUpIfNecessary) { if (m_frameTimer || !shouldAnimate() || frameCount() <= 1) return; // If we aren't already animating, set now as the animation start time. const double time = monotonicallyIncreasingTime(); if (!m_desiredFrameStartTime) m_desiredFrameStartTime = time; // Don't advance the animation to an incomplete frame. size_t nextFrame = (m_currentFrame + 1) % frameCount(); if (!m_allDataReceived && !frameIsCompleteAtIndex(nextFrame)) return; // Don't advance past the last frame if we haven't decoded the whole image // yet and our repetition count is potentially unset. The repetition count // in a GIF can potentially come after all the rest of the image data, so // wait on it. if (!m_allDataReceived && repetitionCount(false) == cAnimationLoopOnce && m_currentFrame >= (frameCount() - 1)) return; // Determine time for next frame to start. By ignoring paint and timer lag // in this calculation, we make the animation appear to run at its desired // rate regardless of how fast it's being repainted. const double currentDuration = frameDurationAtIndex(m_currentFrame); m_desiredFrameStartTime += currentDuration; #if !PLATFORM(IOS) // When an animated image is more than five minutes out of date, the // user probably doesn't care about resyncing and we could burn a lot of // time looping through frames below. Just reset the timings. const double cAnimationResyncCutoff = 5 * 60; if ((time - m_desiredFrameStartTime) > cAnimationResyncCutoff) m_desiredFrameStartTime = time + currentDuration; #else // Maintaining frame-to-frame delays is more important than // maintaining absolute animation timing, so reset the timings each frame. m_desiredFrameStartTime = time + currentDuration; #endif // The image may load more slowly than it's supposed to animate, so that by // the time we reach the end of the first repetition, we're well behind. // Clamp the desired frame start time in this case, so that we don't skip // frames (or whole iterations) trying to "catch up". This is a tradeoff: // It guarantees users see the whole animation the second time through and // don't miss any repetitions, and is closer to what other browsers do; on // the other hand, it makes animations "less accurate" for pages that try to // sync an image and some other resource (e.g. audio), especially if users // switch tabs (and thus stop drawing the animation, which will pause it) // during that initial loop, then switch back later. if (nextFrame == 0 && m_repetitionsComplete == 0 && m_desiredFrameStartTime < time) m_desiredFrameStartTime = time; if (catchUpIfNecessary == DoNotCatchUp || time < m_desiredFrameStartTime) { // Haven't yet reached time for next frame to start; delay until then. startTimer(std::max<double>(m_desiredFrameStartTime - time, 0)); return; } ASSERT(!m_frameTimer); // We've already reached or passed the time for the next frame to start. // See if we've also passed the time for frames after that to start, in // case we need to skip some frames entirely. Remember not to advance // to an incomplete frame. #if !LOG_DISABLED size_t startCatchupFrameIndex = nextFrame; #endif for (size_t frameAfterNext = (nextFrame + 1) % frameCount(); frameIsCompleteAtIndex(frameAfterNext); frameAfterNext = (nextFrame + 1) % frameCount()) { // Should we skip the next frame? double frameAfterNextStartTime = m_desiredFrameStartTime + frameDurationAtIndex(nextFrame); if (time < frameAfterNextStartTime) break; // Yes; skip over it without notifying our observers. If we hit the end while catching up, // tell the observer asynchronously. if (!internalAdvanceAnimation(SkippingFramesToCatchUp)) { m_animationFinishedWhenCatchingUp = true; startTimer(0); LOG(Images, "BitmapImage %p startAnimation catching up from frame %lu, ended", this, startCatchupFrameIndex); return; } m_desiredFrameStartTime = frameAfterNextStartTime; nextFrame = frameAfterNext; } LOG(Images, "BitmapImage %p startAnimation catching up jumped from from frame %lu to %d", this, startCatchupFrameIndex, (int)nextFrame - 1); // Draw the next frame as soon as possible. Note that m_desiredFrameStartTime // may be in the past, meaning the next time through this function we'll // kick off the next advancement sooner than this frame's duration would suggest. startTimer(0); }