Ozone integration.

ui/ozone/platform/drm/gpu/drm_buffer.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 UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_
+
+#include "base/macros.h"
+#include "skia/ext/refptr.h"
+#include "third_party/skia/include/core/SkSurface.h"
+#include "ui/ozone/ozone_export.h"
+#include "ui/ozone/platform/drm/gpu/scanout_buffer.h"
+
+namespace ui {
+
+class DrmDevice;
+
+// Wrapper for a DRM allocated buffer. Keeps track of the native properties of
+// the buffer and wraps the pixel memory into a SkSurface which can be used to
+// draw into using Skia.
+class OZONE_EXPORT DrmBuffer : public ScanoutBuffer {
+ public:
+  DrmBuffer(const scoped_refptr<DrmDevice>& drm);
+
+  // Allocates the backing pixels and wraps them in |surface_|. |info| is used
+  // to describe the buffer characteristics (size, color format).
+  // |should_register_framebuffer| is used to distinguish the buffers that are
+  // used for modesetting.
+  bool Initialize(const SkImageInfo& info, bool should_register_framebuffer);
+
+  SkCanvas* GetCanvas() const;
+
+  // ScanoutBuffer:
+  uint32_t GetFramebufferId() const override;
+  uint32_t GetHandle() const override;
+  gfx::Size GetSize() const override;
+
+ protected:
+  ~DrmBuffer() override;
+
+  scoped_refptr<DrmDevice> drm_;
+
+  // Length of a row of pixels.
+  uint32_t stride_ = 0;
+
+  // Buffer handle used by the DRM allocator.
+  uint32_t handle_ = 0;
+
+  // Base address for memory mapping.
+  void* mmap_base_ = 0;
+
+  // Size for memory mapping.
+  size_t mmap_size_ = 0;
+
+  // Buffer ID used by the DRM modesettings API. This is set when the buffer is
+  // registered with the CRTC.
+  uint32_t framebuffer_ = 0;
+
+  // Wrapper around the native pixel memory.
+  skia::RefPtr<SkSurface> surface_;
+
+  DISALLOW_COPY_AND_ASSIGN(DrmBuffer);
+};
+
+class OZONE_EXPORT DrmBufferGenerator : public ScanoutBufferGenerator {
+ public:
+  DrmBufferGenerator();
+  ~DrmBufferGenerator() override;
+
+  // ScanoutBufferGenerator:
+  scoped_refptr<ScanoutBuffer> Create(const scoped_refptr<DrmDevice>& drm,
+                                      const gfx::Size& size) override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(DrmBufferGenerator);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_DRM_BUFFER_H_