Abstract PPAPI's ImageData behind webrtc::DesktopFrame interface

remoting/client/plugin/pepper_desktop_frame.h

+#ifndef REMOTING_CLIENT_PLUGIN_PEPPER_IMAGE_BUFFER_H_

[Wez, 2013/07/03 20:01:24]

New files need copyright notice.

+#define REMOTING_CLIENT_PLUGIN_PEPPER_IMAGE_BUFFER_H_
+
+#include "third_party/webrtc/modules/desktop_capture/desktop_frame.h"
+
+#ifdef DISALLOW_COPY_AND_ASSIGN
+#undef DISALLOW_COPY_AND_ASSIGN
+#endif
+
+#ifdef DISALLOW_IMPLICIT_CONSTRUCTORS
+#undef DISALLOW_IMPLICIT_CONSTRUCTORS
+#endif
+
+#include "base/memory/scoped_ptr.h"
+#include "ppapi/cpp/image_data.h"
+
+namespace remoting {
+
+// ImageBuffer that uses PPAPI to allocate space for a raw image.
+class PepperDesktopFrame : public webrtc::DesktopFrame {

[Wez, 2013/07/03 20:01:24]

Do you really need a class this complex?  Can't you just have:

static DesktopSize ppSizeToDesktopSize(pp::Size size) {...}

class PepperDesktopFrame : public DesktopFrame {
  PepperDesktopFrame(pp::ImageData image)
    : DesktopFrame(ppSizeToDesktopSize(image.size()),
                   image.stride(),
                   image.data(),
                   NULL),
      image_(image) { }
  pp::ImageData image_;
};

Since pp::ImageData ref-counts the underlying resource internally, and you
really just want to adapt from its interface to DesktopFrame?

+ public:
+  static PepperDesktopFrame* Create(const pp::InstanceHandle& instance,
+                                    int width,
+                                    int height);
+
+  // Constructor.
+  PepperDesktopFrame(pp::Size* size,

[Wez, 2013/07/03 20:01:24]

Why pass these by reference?

+                     pp::ImageData* buffer,

[Wez, 2013/07/03 20:01:24]

When passing objects by reference, use scoped_ptr<Foo> as the parameter/return
value type.

+                     webrtc::DesktopSize* desktop_size);
+
+  // Destructor.
+  ~PepperDesktopFrame();
+
+  // Access to pepper stuff.
+  pp::ImageData& data_object();
+
+ private:
+  scoped_ptr<pp::Size> size_;
+  scoped_ptr<pp::ImageData> buffer_;
+  scoped_ptr<webrtc::DesktopSize> desktop_size_;
+};
+
+}  // namespace remoting
+
+#endif