mix-blend-mode implementation for accelerated layers - blink part

Source/core/rendering/RenderLayerBacking.cpp

 /*
  * Copyright (C) 2009, 2010, 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 190 matching lines @@
     if (m_isMainFrameRenderViewLayer)
         m_graphicsLayer->contentLayer()->setDrawCheckerboardForMissingTiles(true);
 #endif
 
     updateOpacity(renderer()->style());
     updateTransform(renderer()->style());
     updateFilters(renderer()->style());
 
     if (RuntimeEnabledFeatures::cssCompositingEnabled())
         updateLayerBlendMode(renderer()->style());
+    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+        updateIsolatedGroupRoot();
 }
 
 void RenderLayerBacking::destroyGraphicsLayers()
 {
     if (m_graphicsLayer)
         m_graphicsLayer->removeFromParent();
 
     m_ancestorClippingLayer = nullptr;
     m_graphicsLayer = nullptr;
     m_foregroundLayer = nullptr;
@@ skipping 35 matching lines @@
         //
         // Similarly, if filters used to be painted in the compositor and are now painted in software, we need to:
         // (1) Create a FilterEffectRenderer.
         // (2) Repaint the layer contents to apply a software filter because the compositor won't apply it.
         //
         m_owningLayer->updateOrRemoveFilterEffectRenderer();
         setContentsNeedDisplay();
     }
 }
 
-void RenderLayerBacking::updateLayerBlendMode(const RenderStyle*)
+void RenderLayerBacking::updateLayerBlendMode(const RenderStyle* style)
 {
+    setBlendMode(style->blendMode());
+}
+
+void RenderLayerBacking::updateIsolatedGroupRoot()
+{
+    const RenderLayer* layer = m_owningLayer;
+    ASSERT(!layer->shouldIsolateCompositedBlendingDescendants() || layer->isStackingContext());
+    childForSuperlayers()->setIsIsolatedGroupRoot(layer->shouldIsolateCompositedBlendingDescendants());
 }
 
 void RenderLayerBacking::updateContentsOpaque()
 {
     // For non-root layers, background is always painted by the primary graphics layer.
     ASSERT(m_isMainFrameRenderViewLayer || !m_backgroundLayer);
     if (m_backgroundLayer) {
         m_graphicsLayer->setContentsOpaque(false);
         m_backgroundLayer->setContentsOpaque(m_owningLayer->backgroundIsKnownToBeOpaqueInRect(compositedBounds()));
     } else {
@@ skipping 208 matching lines @@
     // is affected by the layer dimensions.
     if (!renderer()->animation()->isRunningAcceleratedAnimationOnRenderer(renderer(), CSSPropertyWebkitTransform))
         updateTransform(renderer()->style());
 
     // Set opacity, if it is not animating.
     if (!renderer()->animation()->isRunningAcceleratedAnimationOnRenderer(renderer(), CSSPropertyOpacity))
         updateOpacity(renderer()->style());
 
     if (RuntimeEnabledFeatures::cssCompositingEnabled())
         updateLayerBlendMode(renderer()->style());
+    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+        updateIsolatedGroupRoot();
 
     bool isSimpleContainer = isSimpleContainerCompositingLayer();
 
     m_owningLayer->updateDescendantDependentFlags();
 
     // m_graphicsLayer is the corresponding GraphicsLayer for this RenderLayer and its non-compositing
     // descendants. So, the visibility flag for m_graphicsLayer should be true if there are any
     // non-compositing visible layers.
     m_graphicsLayer->setContentsVisible(m_owningLayer->hasVisibleContent() || hasVisibleNonCompositingDescendantLayers());
 
@@ skipping 950 matching lines @@
     m_requiresOwnBackingStore = requiresOwnBacking;
 
     // This affects the answer to paintsIntoCompositedAncestor(), which in turn affects
     // cached clip rects, so when it changes we have to clear clip rects on descendants.
     m_owningLayer->clearClipRectsIncludingDescendants(PaintingClipRects);
     m_owningLayer->computeRepaintRectsIncludingDescendants();
 
     compositor()->repaintInCompositedAncestor(m_owningLayer, compositedBounds());
 }
 
-void RenderLayerBacking::setBlendMode(BlendMode)
+void RenderLayerBacking::setBlendMode(BlendMode blendMode)
 {
+    childForSuperlayers()->setBlendMode(blendMode);
 }
 
 void RenderLayerBacking::setContentsNeedDisplay()
 {
     ASSERT(!paintsIntoCompositedAncestor());
 
     if (m_graphicsLayer && m_graphicsLayer->drawsContent())
         m_graphicsLayer->setNeedsDisplay();
 
     if (m_foregroundLayer && m_foregroundLayer->drawsContent())
@@ skipping 451 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore