Initial work for cross-process video rendering using layers.

Introduces VideoLayer, which is similar to BackingStore except handles YUV surfaces and conversion to RGB.

BUG=33329
TEST=N/A

Review URL: http://codereview.chromium.org/597066

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@40137 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 51 insertions, 0 deletions

diff --git a/chrome/browser/renderer_host/video_layer.h b/chrome/browser/renderer_host/video_layer.h
new file mode 100644
index 0000000..66a084f
--- /dev/null
+++ b/chrome/browser/renderer_host/video_layer.h
@@ -0,0 +1,51 @@
+// Copyright (c) 2010 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 CHROME_BROWSER_RENDERER_HOST_VIDEO_LAYER_H_
+#define CHROME_BROWSER_RENDERER_HOST_VIDEO_LAYER_H_
+
+#include "base/gfx/size.h"
+#include "base/scoped_ptr.h"
+#include "chrome/common/transport_dib.h"
+
+class RenderProcessHost;
+class RenderWidgetHost;
+
+namespace gfx {
+class Rect;
+}
+
+// Represents a layer of YUV data owned by RenderWidgetHost and composited with
+// the backing store.  VideoLayer is responsible for converting to RGB as
+// needed.
+class VideoLayer {
+ public:
+  virtual ~VideoLayer();
+
+  RenderWidgetHost* render_widget_host() const { return render_widget_host_; }
+  const gfx::Size& size() { return size_; }
+
+  // Copy the incoming bitmap into this video layer. |bitmap| contains YUV
+  // pixel data in YV12 format and must be the same dimensions as this video
+  // layer. |bitmap_rect| specifies the absolute position and destination size
+  // of the bitmap on the backing store.
+  virtual void CopyTransportDIB(RenderProcessHost* process,
+                                TransportDIB::Id bitmap,
+                                const gfx::Rect& bitmap_rect) = 0;
+
+ protected:
+  // Can only be constructed via subclasses.
+  VideoLayer(RenderWidgetHost* widget, const gfx::Size& size);
+
+ private:
+  // The owner of this video layer.
+  RenderWidgetHost* render_widget_host_;
+
+  // The size of the video layer.
+  gfx::Size size_;
+
+  DISALLOW_COPY_AND_ASSIGN(VideoLayer);
+};
+
+#endif  // CHROME_BROWSER_RENDERER_HOST_VIDEO_LAYER_H_