Add compositor support for half-float RGBA buffers and textures

cc/output/output_surface.h

 // Copyright 2012 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_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include <deque>
 #include <memory>
 
@@ skipping 74 matching lines @@
 
   // Get the class capable of informing cc of hardware overlay capability.
   virtual OverlayCandidateValidator* GetOverlayCandidateValidator() const = 0;
 
   // Returns true if a main image overlay plane should be scheduled.
   virtual bool IsDisplayedAsOverlayPlane() const = 0;
 
   // Get the texture for the main image's overlay.
   virtual unsigned GetOverlayTextureId() const = 0;
 
+  // Returns true if the the surface is more than 8 bits per pixel.
+  virtual bool IsHighBitDepth() const;

[enne (OOO), 2017/02/01 23:55:22]

Maybe should also be pure virtual like the rest of the interface?

[danakj, 2017/02/02 16:23:09]

Yes please.

+
   // If this returns true, then the surface will not attempt to draw.
   virtual bool SurfaceIsSuspendForRecycle() const = 0;
 
   virtual void Reshape(const gfx::Size& size,
                        float device_scale_factor,
                        const gfx::ColorSpace& color_space,
                        bool has_alpha,
                        bool use_stencil) = 0;
 
   virtual bool HasExternalStencilTest() const = 0;
@@ skipping 14 matching lines @@
   scoped_refptr<VulkanContextProvider> vulkan_context_provider_;
   std::unique_ptr<SoftwareOutputDevice> software_device_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_