Ozone support for multiprocess graphics.

ui/ozone/platform/drm/gpu/vgem_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_VGEM_PIXMAP_H_
+#define UI_OZONE_PLATFORM_DRM_GPU_VGEM_PIXMAP_H_
+
+#include "base/files/scoped_file.h"
+#include "base/macros.h"
+#include "ui/ozone/platform/drm/gpu/scanout_buffer.h"
+#include "ui/ozone/platform/drm/gpu/screen_manager.h"
+#include "ui/ozone/public/native_pixmap.h"
+
+namespace ui {
+
+class DrmDevice;
+
+// VgemPixmap is a reference to a dmabuf file descriptor.

[cdotstout, 2016/02/01 19:06:05]

Not in love with the name I used here.  How about DrmDmabufPixmap instead?

// DrmDmabufPixmap is a reference to a drm (PRIME) dmabuf file descriptor.

We should also probably make scanout optional.  But for now we could just
document that it assumes scanout.

[Forrest Reiling, 2016/02/10 19:13:35]

Done.

+// 'Pixmap' not 'buffer' because we have a size (width and height).
+class VgemPixmap : public ScanoutBuffer {
+ public:
+  VgemPixmap(const scoped_refptr<DrmDevice>& drm);
+  ~VgemPixmap() override;
+
+  bool Initialize(base::ScopedFD dma_buf,
+                  int width,
+                  int height,
+                  uint32_t pitch);
+
+  // ScanoutBuffer:
+  uint32_t GetFramebufferId() const override;
+  uint32_t GetHandle() const override;
+  gfx::Size GetSize() const override;
+
+  int GetDmaBufFd() const;
+  int GetDmaBufPitch() const;
+
+ private:
+  scoped_refptr<DrmDevice> drm_;
+
+  // PRIME file descriptor.
+  base::ScopedFD dma_buf_;
+  uint32_t dma_buf_pitch_ = -1;
+
+  // Local gem handle for the file descriptior.
+  uint32_t handle_ = 0;
+
+  // Framebuffer ID for scanout.
+  uint32_t framebuffer_ = 0;
+
+  int width_ = 0;
+  int height_ = 0;
+};
+
+class VgemPixmapWrapper : public NativePixmap {
+ public:
+  VgemPixmapWrapper(ScreenManager* screen_manager,
+                    const scoped_refptr<VgemPixmap>& pixmap);
+  ~VgemPixmapWrapper() override;
+
+  // NativePixmap
+  void* /* EGLClientBuffer */ 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;
+
+ private:
+  scoped_refptr<VgemPixmap> pixmap_;
+  ScreenManager* screen_manager_;
+};
+
+}  // namespace ui
+
+#endif  // UI_OZONE_PLATFORM_DRM_GPU_VGEM_PIXMAP_H_