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

Source/core/rendering/CompositedLayerMapping.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 193 matching lines @@
 
 #if !OS(ANDROID)
     if (m_isMainFrameRenderViewLayer)
         m_graphicsLayer->contentLayer()->setDrawCheckerboardForMissingTiles(true);
 #endif
 
     updateOpacity(renderer()->style());
     updateTransform(renderer()->style());
     updateFilters(renderer()->style());
 
-    if (RuntimeEnabledFeatures::cssCompositingEnabled())
+    if (RuntimeEnabledFeatures::cssCompositingEnabled()) {
         updateLayerBlendMode(renderer()->style());
+        updateIsRootForIsolatedGroup();
+    }
 }
 
 void CompositedLayerMapping::destroyGraphicsLayers()
 {
     if (m_graphicsLayer)
         m_graphicsLayer->removeFromParent();
 
     m_ancestorClippingLayer = nullptr;
     m_graphicsLayer = nullptr;
     m_foregroundLayer = nullptr;
@@ skipping 36 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 CompositedLayerMapping::updateLayerBlendMode(const RenderStyle*)
+void CompositedLayerMapping::updateLayerBlendMode(const RenderStyle* style)
 {
+    setBlendMode(style->blendMode());
+}
+
+void CompositedLayerMapping::updateIsRootForIsolatedGroup()
+{
+    bool isolate = m_owningLayer->shouldIsolateCompositedDescendants();
+
+    // non stacking context layers should never isolate
+    ASSERT(m_owningLayer->stackingNode()->isStackingContext() || !isolate);
+
+    m_graphicsLayer->setIsRootForIsolatedGroup(isolate);
 }
 
 void CompositedLayerMapping::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 246 matching lines @@
         ? !hasActiveAnimationsOnCompositor(*renderer(), CSSPropertyWebkitTransform)
         : !renderer()->animation().isRunningAcceleratedAnimationOnRenderer(renderer(), CSSPropertyWebkitTransform))
         updateTransform(renderer()->style());
 
     // Set opacity, if it is not animating.
     if (RuntimeEnabledFeatures::webAnimationsCSSEnabled()
         ? !hasActiveAnimationsOnCompositor(*renderer(), CSSPropertyOpacity)
         : !renderer()->animation().isRunningAcceleratedAnimationOnRenderer(renderer(), CSSPropertyOpacity))
         updateOpacity(renderer()->style());
 
-    if (RuntimeEnabledFeatures::cssCompositingEnabled())
-        updateLayerBlendMode(renderer()->style());
-
     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.
     bool contentsVisible = m_owningLayer->hasVisibleContent() || hasVisibleNonCompositingDescendantLayers();
     if (RuntimeEnabledFeatures::overlayFullscreenVideoEnabled() && renderer()->isVideo()) {
         HTMLMediaElement* mediaElement = toHTMLMediaElement(renderer()->node());
@@ skipping 227 matching lines @@
         }
     }
 
     if (m_owningLayer->scrollableArea())
         m_owningLayer->scrollableArea()->positionOverflowControls();
 
     // We can't make this call in RenderLayerCompositor::allocateOrClearCompositedLayerMapping
     // since it depends on whether compAncestor draws content, which gets updated later.
     updateRequiresOwnBackingStoreForAncestorReasons(compAncestor);
 
+    if (RuntimeEnabledFeatures::cssCompositingEnabled()) {
+        updateLayerBlendMode(style);
+        updateIsRootForIsolatedGroup();
+    }
+
     updateContentsRect(isSimpleContainer);
     updateBackgroundColor(isSimpleContainer);
     updateDrawsContent(isSimpleContainer);
     updateContentsOpaque();
     updateAfterWidgetResize();
     registerScrollingLayers();
 
     updateCompositingReasons();
 }
 
@@ skipping 782 matching lines @@
 void CompositedLayerMapping::paintsIntoCompositedAncestorChanged()
 {
     // The answer to paintsIntoCompositedAncestor() affects cached clip rects, so when
     // it changes we have to clear clip rects on descendants.
     m_owningLayer->clipper().clearClipRectsIncludingDescendants(PaintingClipRects);
     m_owningLayer->repainter().computeRepaintRectsIncludingDescendants();
 
     compositor()->repaintInCompositedAncestor(m_owningLayer, compositedBounds());
 }
 
-void CompositedLayerMapping::setBlendMode(blink::WebBlendMode)
+void CompositedLayerMapping::setBlendMode(blink::WebBlendMode blendMode)
 {
+    if (m_ancestorClippingLayer) {
+        ASSERT(childForSuperlayers() == m_ancestorClippingLayer.get());
+        m_graphicsLayer->setBlendMode(blink::WebBlendModeNormal);
+    } else {
+        ASSERT(childForSuperlayers() == m_graphicsLayer.get());
+    }
+    childForSuperlayers()->setBlendMode(blendMode);
 }
 
 void CompositedLayerMapping::setContentsNeedDisplay()
 {
     ASSERT(!paintsIntoCompositedAncestor());
 
     if (m_graphicsLayer && m_graphicsLayer->drawsContent())
         m_graphicsLayer->setNeedsDisplay();
 
     if (m_foregroundLayer && m_foregroundLayer->drawsContent())
@@ skipping 422 matching lines @@
     } else if (graphicsLayer == m_scrollingContentsLayer.get()) {
         name = "Scrolling Contents Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace WebCore