NotForReview: Implement zero/one-copy texture for ozone freon using Intel DRM

ui/ozone/platform/drm/gpu/intel_drm_pixmap.h

+// Copyright 2015 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_INTEL_DRM_PIXMAP_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_INTEL_DRM_PIXMAP_H_
+
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/ozone/public/native_pixmap.h"
+#include "ui/ozone/public/surface_factory_ozone.h"
+
+typedef struct _drm_intel_bo drm_intel_bo;
+
+namespace ui {
+
+class IntelDrmPixmap : public NativePixmap {

[dshwang, 2015/06/29 17:22:05]

All code using Intel DRM are in this class. Both GPU process and Renderer use
this class like below examples;

GPU process:
1. IntelDrmPixmap::Create()
2. Send GetDmaBufFd() to Renderer

Renderer:
1. IntelDrmPixmap::CreateFromHandle() using dam_buf
2. Map()/Unmap()
3. ~IntelDrmPixmap()

GPU process:
3. ~IntelDrmPixmap()

+ public:
+  static scoped_refptr<IntelDrmPixmap> Create(
+      base::FileDescriptor device_fd,
+      SurfaceFactoryOzone::BufferFormat format,
+      const gfx::Size& size);
+
+  // Renderer uses this API.
+  static scoped_refptr<IntelDrmPixmap> CreateFromHandle(
+      base::FileDescriptor device_fd,
+      base::FileDescriptor handle,
+      SurfaceFactoryOzone::BufferFormat format,
+      const gfx::Size& size);
+
+  // NativePixmap:
+  void* GetEGLClientBuffer() override;
+  int GetDmaBufFd() override;
+  int GetDmaBufPitch() override;
+
+  bool ScheduleOverlayPlane(gfx::AcceleratedWidget widget,
+                            int plane_z_order,
+                            gfx::OverlayTransform plane_transform,
+                            const gfx::Rect& display_bounds,
+                            const gfx::RectF& crop_rect) override;
+  void SetScalingCallback(const ScalingCallback& scaling_callback) override;
+  scoped_refptr<NativePixmap> GetScaledPixmap(gfx::Size new_size) override;
+  BufferUsage GetBufferUsage() const override;
+  void* Map() override;
+  void Unmap() override;
+
+ private:
+  IntelDrmPixmap();
+  ~IntelDrmPixmap() override;
+
+  bool Initialize(base::FileDescriptor device_fd,
+                  SurfaceFactoryOzone::BufferFormat format,
+                  const gfx::Size& size);
+  bool InitializeFromHandle(base::FileDescriptor device_fd,
+                            base::FileDescriptor handle,
+                            SurfaceFactoryOzone::BufferFormat format,
+                            const gfx::Size& size);
+
+  drm_intel_bo* buffer_;
+  base::ScopedFD prime_fd_;
+  uint32 stride_;
+
+  DISALLOW_COPY_AND_ASSIGN(IntelDrmPixmap);
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_INTEL_DRM_PIXMAP_H_