Compute damage rect for Cast video compositing

cc/output/overlay_processor.h

 // Copyright 2014 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_OUTPUT_OVERLAY_PROCESSOR_H_
 #define CC_OUTPUT_OVERLAY_PROCESSOR_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 11 matching lines @@
   class CC_EXPORT Strategy {
    public:
     virtual ~Strategy() {}
     // Returns false if the strategy cannot be made to work with the
     // current set of render passes. Returns true if the strategy was successful
     // and adds any additional passes necessary to represent overlays to
     // |render_passes|.
     virtual bool Attempt(ResourceProvider* resource_provider,
                          RenderPass* render_pass,
                          OverlayCandidateList* candidates) = 0;
+
+    virtual bool GetSwapWithDamageRect(gfx::Rect* rect);
   };
   using StrategyList = std::vector<std::unique_ptr<Strategy>>;
 
   explicit OverlayProcessor(OutputSurface* surface);
   virtual ~OverlayProcessor();
   // Virtual to allow testing different strategies.
   virtual void Initialize();
 
   gfx::Rect GetAndResetOverlayDamage();
 
   // Attempt to replace quads from the specified root render pass with overlays
   // or CALayers. This must be called every frame.
   void ProcessForOverlays(ResourceProvider* resource_provider,
                           RenderPass* root_render_pass,
                           OverlayCandidateList* overlay_candidates,
                           CALayerOverlayList* ca_layer_overlays,
                           gfx::Rect* damage_rect);
 
+  bool GetSwapWithDamageRect(gfx::Rect* damage_rect);
+
  protected:
   StrategyList strategies_;
   OutputSurface* surface_;
   gfx::Rect overlay_damage_rect_;
   gfx::Rect previous_frame_underlay_rect_;
 
+  bool have_swap_with_damage_rect_;
+  gfx::Rect swap_with_damage_rect_;
+
  private:
   bool ProcessForCALayers(ResourceProvider* resource_provider,
                           RenderPass* render_pass,
                           OverlayCandidateList* overlay_candidates,
                           CALayerOverlayList* ca_layer_overlays,
                           gfx::Rect* damage_rect);
   // Update |damage_rect| by removing damage casued by |candidates|.
   void UpdateDamageRect(OverlayCandidateList* candidates,
                         gfx::Rect* damage_rect);
 
   DISALLOW_COPY_AND_ASSIGN(OverlayProcessor);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OVERLAY_PROCESSOR_H_