[SPv2] Add CSS mix-blend-mode support

third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EffectPaintPropertyNode_h
 #define EffectPaintPropertyNode_h
 
 #include "cc/layers/layer.h"
 #include "platform/PlatformExport.h"
 #include "platform/graphics/CompositorFilterOperations.h"
@@ skipping 15 matching lines @@
 class PLATFORM_EXPORT EffectPaintPropertyNode
     : public RefCounted<EffectPaintPropertyNode> {
  public:
   static EffectPaintPropertyNode* root();
 
   static PassRefPtr<EffectPaintPropertyNode> create(
       PassRefPtr<const EffectPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> localTransformSpace,
       PassRefPtr<const ClipPaintPropertyNode> outputClip,
       CompositorFilterOperations filter,
-      float opacity) {
+      float opacity,
+      SkBlendMode blendMode) {
     return adoptRef(new EffectPaintPropertyNode(
         std::move(parent), std::move(localTransformSpace),
-        std::move(outputClip), std::move(filter), opacity));
+        std::move(outputClip), std::move(filter), opacity, blendMode));
   }
 
   void update(PassRefPtr<const EffectPaintPropertyNode> parent,
               PassRefPtr<const TransformPaintPropertyNode> localTransformSpace,
               PassRefPtr<const ClipPaintPropertyNode> outputClip,
               CompositorFilterOperations filter,
-              float opacity) {
+              float opacity,
+              SkBlendMode blendMode) {
     DCHECK(!isRoot());
     DCHECK(parent != this);
     m_parent = parent;
     m_localTransformSpace = localTransformSpace;
     m_outputClip = outputClip;
     m_filter = std::move(filter);
     m_opacity = opacity;
+    m_blendMode = blendMode;
   }
 
   const TransformPaintPropertyNode* localTransformSpace() const {
     return m_localTransformSpace.get();
   }
   const ClipPaintPropertyNode* outputClip() const { return m_outputClip.get(); }
 
+  SkBlendMode blendMode() const { return m_blendMode; }
   float opacity() const { return m_opacity; }
   const CompositorFilterOperations& filter() const { return m_filter; }
 
   // Parent effect or nullptr if this is the root effect.
   const EffectPaintPropertyNode* parent() const { return m_parent.get(); }
   bool isRoot() const { return !m_parent; }
 
   cc::Layer* ensureDummyLayer() const;
 
 #if DCHECK_IS_ON()
   // The clone function is used by FindPropertiesNeedingUpdate.h for recording
   // an effect node before it has been updated, to later detect changes.
   PassRefPtr<EffectPaintPropertyNode> clone() const {
-    return adoptRef(new EffectPaintPropertyNode(
-        m_parent, m_localTransformSpace, m_outputClip, m_filter, m_opacity));
+    return adoptRef(new EffectPaintPropertyNode(m_parent, m_localTransformSpace,
+                                                m_outputClip, m_filter,
+                                                m_opacity, m_blendMode));
   }
 
   // The equality operator is used by FindPropertiesNeedingUpdate.h for checking
   // if an effect node has changed. It ignores changes of reference filters
   // because SkImageFilter doesn't have an equality operator.
   bool operator==(const EffectPaintPropertyNode& o) const {
     return m_parent == o.m_parent &&
            m_localTransformSpace == o.m_localTransformSpace &&
            m_outputClip == o.m_outputClip && m_opacity == o.m_opacity &&
+           m_blendMode == o.m_blendMode &&
            m_filter.equalsIgnoringReferenceFilters(o.m_filter);
   }
 #endif
 
  private:
   EffectPaintPropertyNode(
       PassRefPtr<const EffectPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> localTransformSpace,
       PassRefPtr<const ClipPaintPropertyNode> outputClip,
       CompositorFilterOperations filter,
-      float opacity)
+      float opacity,
+      SkBlendMode blendMode)
       : m_parent(parent),
         m_localTransformSpace(localTransformSpace),
         m_outputClip(outputClip),
         m_filter(std::move(filter)),
-        m_opacity(opacity) {}
+        m_opacity(opacity),
+        m_blendMode(blendMode) {}
 
   RefPtr<const EffectPaintPropertyNode> m_parent;
   // The local transform space serves two purposes:
   // 1. Assign a depth mapping for 3D depth sorting against other paint chunks
   //    and effects under the same parent.
   // 2. Some effects are spatial (namely blur filter and reflection), the
   //    effect parameters will be specified in the local space.
   RefPtr<const TransformPaintPropertyNode> m_localTransformSpace;
   // The output of the effect can be optionally clipped when composited onto
   // the current backdrop.
   RefPtr<const ClipPaintPropertyNode> m_outputClip;
 
   // Optionally a number of effects can be applied to the composited output.
   // The chain of effects will be applied in the following order:
   // === Begin of effects ===
   CompositorFilterOperations m_filter;
   float m_opacity;
+  SkBlendMode m_blendMode;
   // === End of effects ===
 
   // TODO(trchen): Remove the dummy layer.
   // The main purpose of the dummy layer is to maintain a permanent identity
   // to associate with cc::RenderSurfaceImpl for damage tracking. This shall
   // be removed in favor of a stable ID once cc::LayerImpl no longer owns
   // RenderSurfaceImpl.
   mutable scoped_refptr<cc::Layer> m_dummyLayer;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const EffectPaintPropertyNode&, std::ostream*);
 
 }  // namespace blink
 
 #endif  // EffectPaintPropertyNode_h