Add multi-planar functions to GpuMemoryBuffer

content/common/gpu/client/gpu_memory_buffer_impl.h

 // Copyright 2013 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 CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
 #define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_
 
 #include "base/callback.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/content_export.h"
@@ skipping 23 matching lines @@
   static GpuMemoryBufferImpl* FromClientBuffer(ClientBuffer buffer);
 
   // Calculates the number of bytes that an implementation must use to store
   // one row of pixel data.
   static bool StrideInBytes(size_t width,
                             Format format,
                             size_t* stride_in_bytes);
 
   // Overridden from gfx::GpuMemoryBuffer:
   bool IsMapped() const override;
+  size_t GetNumberOfPlanes() const override;
   Format GetFormat() const override;
   ClientBuffer AsClientBuffer() override;
 
   void set_destruction_sync_point(uint32 sync_point) {
     destruction_sync_point_ = sync_point;
   }
 
  protected:
   GpuMemoryBufferImpl(gfx::GpuMemoryBufferId id,
                       const gfx::Size& size,
                       Format format,
                       const DestructionCallback& callback);
 
   const gfx::GpuMemoryBufferId id_;
   const gfx::Size size_;
   const Format format_;
+  const size_t num_planes_;

[reveman, 2015/03/21 03:03:55]

This can be derived from the format. I don't think we need a member for it.

[emircan, 2015/03/23 19:21:35]

Acknowledged. I wanted to define this as const in construction time deriving
from format, so that it can't be changed and cheaper to access. 

   const DestructionCallback callback_;
   bool mapped_;
   uint32 destruction_sync_point_;
 
  private:
+
+  // Returns the number of planes based on the format of the buffer.
+  static size_t NumberOfPlanesForGpuMemoryBufferFormat(
+      gfx::GpuMemoryBuffer::Format format);
+
   DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImpl);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_H_