Rework timeline/frame scheduling logic for SVGImage

third_party/WebKit/Source/core/css/CSSCrossfadeValue.cpp

 /*
  * Copyright (C) 2011 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
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 231 matching lines @@
 }
 
 void CSSCrossfadeValue::crossfadeChanged(const IntRect&)
 {
     for (const auto& curr : clients()) {
         LayoutObject* client = const_cast<LayoutObject*>(curr.key);
         client->imageChanged(static_cast<WrappedImagePtr>(this));
     }
 }
 
+bool CSSCrossfadeValue::willRenderImage() const
+{
+    for (const auto& curr : clients()) {
+        if (const_cast<LayoutObject*>(curr.key)->willRenderImage())
+            return true;
+    }
+    return false;
+}
+
 void CSSCrossfadeValue::CrossfadeSubimageObserverProxy::imageChanged(ImageResource*, const IntRect* rect)
 {
     if (m_ready)
         m_ownerValue->crossfadeChanged(*rect);
 }
 
+bool CSSCrossfadeValue::CrossfadeSubimageObserverProxy::willRenderImage()
+{
+    // If the images are not ready/loaded we won't paint them. If the images
+    // are ready then ask the clients.
+    return m_ready && m_ownerValue->willRenderImage();
+}
+
 bool CSSCrossfadeValue::hasFailedOrCanceledSubresources() const
 {
     if (m_cachedFromImage && m_cachedFromImage->loadFailedOrCanceled())
         return true;
     if (m_cachedToImage && m_cachedToImage->loadFailedOrCanceled())
         return true;
     return false;
 }
 
 bool CSSCrossfadeValue::equals(const CSSCrossfadeValue& other) const
 {
     return compareCSSValuePtr(m_fromValue, other.m_fromValue)
         && compareCSSValuePtr(m_toValue, other.m_toValue)
         && compareCSSValuePtr(m_percentageValue, other.m_percentageValue);
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(CSSCrossfadeValue)
 {
     visitor->trace(m_fromValue);
     visitor->trace(m_toValue);
     visitor->trace(m_percentageValue);
     visitor->trace(m_cachedFromImage);
     visitor->trace(m_cachedToImage);
     visitor->trace(m_crossfadeSubimageObserver);
     CSSImageGeneratorValue::traceAfterDispatch(visitor);
 }
 
 } // namespace blink