Add NativePixmapDmabufStub to finalize glCreateImageCHROMIUM on Linux.

ui/gfx/linux/native_pixmap_dmabuf.h

+// Copyright 2017 The Chromium Authors. All rights reserved.

[reveman, 2017/06/05 17:44:42]

Can we share this code with ozone somehow? Maybe ozone impl can inherit from
this?

[Julien Isorce, 2017/06/05 20:23:58]

Thx for the suggestions. I just had another look and it might possible to do it
in a less intrusive way than I thought initially. By re-using
gfx::NativePixmapHandle 

(https://chromium.googlesource.com/chromium/src.git/+/master/ui/gfx/native_pix...).
The new gfx::NativePixmapDmabuf will own a gfx::NativePixmapHandle.
And ozone::GbmBuffer will inherit from gfx::NativePixmapHandle
(https://chromium.googlesource.com/chromium/src.git/+/master/ui/ozone/platform...)
Which will make possible for ozone::GbmPixmap to inherit from the new
gfx::NativePixmapDmabuf.
Something like that, I need to try and see how it goes.

[Julien Isorce, 2017/06/07 20:10:48]

Done.

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_GFX_LINUX_NATIVE_PIXMAP_DMABUF_H_
+#define UI_GFX_LINUX_NATIVE_PIXMAP_DMABUF_H_
+
+#include <stdint.h>
+
+#include <memory>
+
+#include "base/files/scoped_file.h"
+#include "base/macros.h"
+#include "ui/gfx/client_native_pixmap.h"
+#include "ui/gfx/geometry/size.h"
+#include "ui/gfx/native_pixmap.h"
+
+namespace gfx {
+
+class GFX_EXPORT NativePixmapDmaBuf : public gfx::NativePixmap {
+ public:
+  NativePixmapDmaBuf(const gfx::Size& size,
+                     gfx::BufferFormat format,
+                     const gfx::NativePixmapHandle& handle);
+
+  // NativePixmap:
+  void* GetEGLClientBuffer() const override;
+  bool AreDmaBufFdsValid() const override;
+  size_t GetDmaBufFdCount() const override;
+  int GetDmaBufFd(size_t plane) const override;
+  int GetDmaBufPitch(size_t plane) const override;
+  int GetDmaBufOffset(size_t plane) const override;
+  uint64_t GetDmaBufModifier(size_t plane) const override;
+  gfx::BufferFormat GetBufferFormat() const override;
+  gfx::Size GetBufferSize() const 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 SetProcessingCallback(
+      const ProcessingCallback& processing_callback) override;
+  gfx::NativePixmapHandle ExportHandle() override;
+
+ private:
+  ~NativePixmapDmaBuf() override;
+
+  gfx::Size size_;
+  gfx::BufferFormat format_;
+  std::vector<base::ScopedFD> fds_;
+  std::vector<gfx::NativePixmapPlane> planes_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativePixmapDmaBuf);
+};
+
+}  // namespace gfx
+
+#endif  // UI_GFX_LINUX_NATIVE_PIXMAP_DMABUF_H_