mix-blend-mode implementation for accelerated layers

cc/quads/render_pass_draw_quad.h

 // Copyright 2011 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 CC_QUADS_RENDER_PASS_DRAW_QUAD_H_
 #define CC_QUADS_RENDER_PASS_DRAW_QUAD_H_
 
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "cc/base/cc_export.h"
@@ skipping 11 matching lines @@
 
   void SetNew(const SharedQuadState* shared_quad_state,
               gfx::Rect rect,
               RenderPass::Id render_pass_id,
               bool is_replica,
               ResourceProvider::ResourceId mask_resource_id,
               gfx::Rect contents_changed_since_last_frame,
               gfx::RectF mask_uv_rect,
               const FilterOperations& filters,
               skia::RefPtr<SkImageFilter> filter,
-              const FilterOperations& background_filters);
+              const FilterOperations& background_filters,
+              SkXfermode::Mode blend_mode = SkXfermode::kSrcOver_Mode);

[shawnsingh, 2013/09/25 05:33:53]

would it make more sense to put this in the SharedQuadState instead?  It won't
change for each quad within one layer.

[rosca, 2013/09/25 18:00:00]

Done.

 
   void SetAll(const SharedQuadState* shared_quad_state,
               gfx::Rect rect,
               gfx::Rect opaque_rect,
               gfx::Rect visible_rect,
               bool needs_blending,
               RenderPass::Id render_pass_id,
               bool is_replica,
               ResourceProvider::ResourceId mask_resource_id,
               gfx::Rect contents_changed_since_last_frame,
               gfx::RectF mask_uv_rect,
               const FilterOperations& filters,
               skia::RefPtr<SkImageFilter> filter,
-              const FilterOperations& background_filters);
+              const FilterOperations& background_filters,
+              SkXfermode::Mode blend_mode = SkXfermode::kSrcOver_Mode);
 
   scoped_ptr<RenderPassDrawQuad> Copy(
       const SharedQuadState* copied_shared_quad_state,
       RenderPass::Id copied_render_pass_id) const;
 
   RenderPass::Id render_pass_id;
   bool is_replica;
   ResourceProvider::ResourceId mask_resource_id;
   gfx::Rect contents_changed_since_last_frame;
   gfx::RectF mask_uv_rect;
 
   // Deprecated post-processing filters, applied to the pixels in the render
   // pass' texture.
   FilterOperations filters;
   // Post-processing filter applied to the pixels in the render pass' texture.
   skia::RefPtr<SkImageFilter> filter;
 
   // Post-processing filters, applied to the pixels showing through the
   // background of the render pass, from behind it.
   FilterOperations background_filters;
 
+  SkXfermode::Mode blend_mode;
+
   virtual void IterateResources(const ResourceIteratorCallback& callback)
       OVERRIDE;
 
   static const RenderPassDrawQuad* MaterialCast(const DrawQuad*);
 
  private:
   RenderPassDrawQuad();
   virtual void ExtendValue(base::DictionaryValue* value) const OVERRIDE;
 };
 
 }  // namespace cc
 
 #endif  // CC_QUADS_RENDER_PASS_DRAW_QUAD_H_