Expose setting API to set ImageAnimationPolicy(Allowed, Once, None)

Source/platform/graphics/BitmapImage.cpp

 /*
  * Copyright (C) 2006 Samuel Weinig (sam.weinig@gmail.com)
  * Copyright (C) 2004, 2005, 2006, 2008 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 40 matching lines @@
 BitmapImage::BitmapImage(ImageObserver* observer)
     : Image(observer)
     , m_currentFrame(0)
     , m_frames()
     , m_frameTimer(0)
     , m_repetitionCount(cAnimationNone)
     , m_repetitionCountStatus(Unknown)
     , m_repetitionsComplete(0)
     , m_desiredFrameStartTime(0)
     , m_frameCount(0)
+    , m_animationPolicy(ImageAnimationPolicyAllowed)
     , m_isSolidColor(false)
     , m_checkedForSolidColor(false)
     , m_animationFinished(false)
     , m_allDataReceived(false)
     , m_haveSize(false)
     , m_sizeAvailable(false)
     , m_hasUniformFrameSize(true)
     , m_haveFrameCount(false)
 {
 }
 
 BitmapImage::BitmapImage(PassRefPtr<NativeImageSkia> nativeImage, ImageObserver* observer)
     : Image(observer)
     , m_size(nativeImage->bitmap().width(), nativeImage->bitmap().height())
     , m_currentFrame(0)
     , m_frames(0)
     , m_frameTimer(0)
     , m_repetitionCount(cAnimationNone)
     , m_repetitionCountStatus(Unknown)
     , m_repetitionsComplete(0)
     , m_frameCount(1)
+    , m_animationPolicy(ImageAnimationPolicyAllowed)
     , m_isSolidColor(false)
     , m_checkedForSolidColor(false)
     , m_animationFinished(true)
     , m_allDataReceived(true)
     , m_haveSize(true)
     , m_sizeAvailable(true)
     , m_haveFrameCount(true)
 {
     // Since we don't have a decoder, we can't figure out the image orientation.
     // Set m_sizeRespectingOrientation to be the same as m_size so it's not 0x0.
@@ skipping 340 matching lines @@
         // decoder will default to cAnimationLoopOnce, and we'll try and read
         // the count again once the whole image is decoded.
         m_repetitionCount = m_source.repetitionCount();
         m_repetitionCountStatus = (imageKnownToBeComplete || m_repetitionCount == cAnimationNone) ? Certain : Uncertain;
     }
     return m_repetitionCount;
 }
 
 bool BitmapImage::shouldAnimate()
 {
-    return (repetitionCount(false) != cAnimationNone && !m_animationFinished && imageObserver());
+    bool animated = repetitionCount(false) != cAnimationNone && !m_animationFinished && imageObserver();
+    if (imageObserver()) {
+        imageObserver()->imageAnimationPolicy(this, m_animationPolicy);
+        if (animated && m_animationPolicy == ImageAnimationPolicyNoAnimation)
+            animated = false;
+    }
+    return animated;
 }
 
 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))
+    if (!m_allDataReceived
+        && (repetitionCount(false) == cAnimationLoopOnce || m_animationPolicy == ImageAnimationPolicyAnimateOnce)
+        && 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
@@ skipping 114 matching lines @@
     ++m_currentFrame;
     bool advancedAnimation = true;
     if (m_currentFrame >= frameCount()) {
         ++m_repetitionsComplete;
 
         // Get the repetition count again.  If we weren't able to get a
         // repetition count before, we should have decoded the whole image by
         // now, so it should now be available.
         // Note that we don't need to special-case cAnimationLoopOnce here
         // because it is 0 (see comments on its declaration in ImageSource.h).
-        if (repetitionCount(true) != cAnimationLoopInfinite && m_repetitionsComplete > m_repetitionCount) {
+        if ((repetitionCount(true) != cAnimationLoopInfinite && m_repetitionsComplete > m_repetitionCount)
+            || (m_animationPolicy == ImageAnimationPolicyAnimateOnce && m_repetitionsComplete > 0)) {
             m_animationFinished = true;
             m_desiredFrameStartTime = 0;
             --m_currentFrame;
             advancedAnimation = false;
         } else
             m_currentFrame = 0;
     }
     destroyDecodedDataIfNecessary();
 
     // We need to draw this frame if we advanced to it while not skipping, or if
@@ skipping 32 matching lines @@
 
     return m_isSolidColor && !m_currentFrame;
 }
 
 Color BitmapImage::solidColor() const
 {
     return m_solidColor;
 }
 
 } // namespace blink