gpu: Add IOSurface backed GpuMemoryBuffer implementation.

content/common/gpu/client/gpu_memory_buffer_impl_io_surface.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_IO_SURFACE_H_
+#define CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_IO_SURFACE_H_
+
+#include "base/mac/scoped_cftyperef.h"
+#include "content/common/gpu/client/gpu_memory_buffer_impl.h"
+
+namespace content {
+
+// Provides implementation of a GPU memory buffer based
+// on an IO surface handle.
+class GpuMemoryBufferImplIOSurface : public GpuMemoryBufferImpl {
+ public:
+  GpuMemoryBufferImplIOSurface(gfx::Size size, unsigned internalformat);
+  virtual ~GpuMemoryBufferImplIOSurface();
+
+  static bool IsFormatValid(unsigned internalformat);
+  static uint32 PixelFormat(unsigned internalformat);
+
+  bool Initialize(gfx::GpuMemoryBufferHandle handle);
+
+  // Overridden from gfx::GpuMemoryBuffer:
+  virtual void Map(AccessMode mode, void** vaddr) OVERRIDE;
+  virtual void Unmap() OVERRIDE;
+  virtual uint32 GetStride() const OVERRIDE;
+  virtual gfx::GpuMemoryBufferHandle GetHandle() const OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(GpuMemoryBufferImplIOSurface);
+
+  base::ScopedCFTypeRef<CFTypeRef> io_surface_;
+};
+
+}  // namespace content
+
+#endif  // CONTENT_COMMON_GPU_CLIENT_GPU_MEMORY_BUFFER_IMPL_IO_SURFACE_H_