Scan-out capable buffers (aka ui::NativePixmap) for Mus

components/mus/gles2/ozone_gpu_memory_buffer.h

+// Copyright 2016 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 COMPONENTS_MUS_GLES2_OZONE_GPU_MEMORY_BUFFER_
+#define COMPONENTS_MUS_GLES2_OZONE_GPU_MEMORY_BUFFER_
+
+#include "base/memory/scoped_ptr.h"
+#include "components/mus/gles2/gpu_memory_buffer_impl.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/gpu_memory_buffer.h"
+#include "ui/gfx/native_widget_types.h"
+
+namespace ui {
+class ClientNativePixmap;
+class NativePixmap;
+}  // namespace ui
+
+namespace mus {
+
+// A not-mojo GpuMemoryBuffer implementation solely for use internally to mus
+// for scanout buffers. Note that OzoneGpuMemoryBuffer is for use on the client
+// (aka CC thread).
+class OzoneGpuMemoryBuffer : public mus::GpuMemoryBufferImpl {
+ public:
+  ~OzoneGpuMemoryBuffer() override;
+
+  // gfx::GpuMemoryBuffer implementation
+  bool Map() override;
+  void Unmap() override;
+  void* memory(size_t plane) override;
+  int stride(size_t plane) const override;
+  gfx::GpuMemoryBufferHandle GetHandle() const override;
+
+  // Returns the type of this GpuMemoryBufferImpl.
+  gfx::GpuMemoryBufferType GetBufferType() const override;
+  scoped_refptr<ui::NativePixmap> GetNativePixmap() override;
+
+  // Create a NativeBuffer. The implementation (mus-specific) will call directly
+  // into ozone to allocate the buffer. See the version in the .cc file.
+  static scoped_ptr<gfx::GpuMemoryBuffer> CreateOzoneGpuMemoryBuffer(
+      const gfx::Size& size,
+      gfx::BufferFormat format,
+      gfx::BufferUsage usage,
+      gfx::AcceleratedWidget widget);
+
+  // Cribbed from content/common/gpu/client/gpu_memory_buffer_impl.h
+  static OzoneGpuMemoryBuffer* FromClientBuffer(ClientBuffer buffer);
+
+ private:
+  // TODO(rjkroege): It is conceivable that we do not need an |id| here. It
+  // would seem to be a legacy of content leaking into gfx. In a mojo context,
+  // perhaps it should be a mojo handle instead.
+  OzoneGpuMemoryBuffer(gfx::GpuMemoryBufferId id,
+                       const gfx::Size& size,
+                       gfx::BufferFormat format,
+                       scoped_ptr<ui::ClientNativePixmap> client_pixmap,
+                       scoped_refptr<ui::NativePixmap> native_pixmap);
+
+  // The real backing buffer.
+  // From content/common/gpu/client/gpu_memory_buffer_impl_ozone_native_pixmap.h
+  scoped_ptr<ui::ClientNativePixmap> client_pixmap_;
+  scoped_refptr<ui::NativePixmap> native_pixmap_;
+
+  DISALLOW_COPY_AND_ASSIGN(OzoneGpuMemoryBuffer);
+};
+
+}  // namespace mus
+
+#endif  // COMPONENTS_MUS_GLES2_OZONE_GPU_MEMORY_BUFFER_