Define frame subscription interface and implementation on Mac
Define RenderWidgetHostViewFrameSubscriber for listening to frame
presentation events by platform frame presenter. This will enable
a push model for generating captured frames from a RenderView.
Also implement this on Mac.
BUG=174525
Review URL: https://chromiumcodereview.appspot.com/12277023
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@186108 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/renderer_host/compositing_iosurface_mac.h b/content/browser/renderer_host/compositing_iosurface_mac.h
index 28e1a11..32743dc 100644
--- a/content/browser/renderer_host/compositing_iosurface_mac.h
+++ b/content/browser/renderer_host/compositing_iosurface_mac.h
@@ -30,6 +30,8 @@
namespace content {
+class RenderWidgetHostViewFrameSubscriber;
+
// This class manages an OpenGL context and IOSurface for the accelerated
// compositing code path. The GL context is attached to
// RenderWidgetHostViewCocoa for blitting the IOSurface.
@@ -55,7 +57,10 @@
// Blit the IOSurface at the upper-left corner of the |view|. If |view| window
// size is larger than the IOSurface, the remaining right and bottom edges
// will be white. |scaleFactor| is 1 in normal views, 2 in HiDPI views.
- void DrawIOSurface(NSView* view, float scale_factor);
+ // |frame_subscriber| listens to this draw event and provides output buffer
+ // for copying this frame into.
+ void DrawIOSurface(NSView* view, float scale_factor,
+ RenderWidgetHostViewFrameSubscriber* frame_subscriber);
// Copy the data of the "live" OpenGL texture referring to this IOSurfaceRef
// into |out|. The copied region is specified with |src_pixel_subrect| and
@@ -228,6 +233,15 @@
void StartOrContinueDisplayLink();
void StopDisplayLink();
+ // Copy current frame to |target| video frame. This method must be called
+ // within a CGL context. Returns a callback that should be called outside
+ // of the CGL context.
+ base::Closure CopyToVideoFrameInternal(
+ const gfx::Rect& src_subrect,
+ float src_scale_factor,
+ const scoped_refptr<media::VideoFrame>& target,
+ const base::Callback<void(bool)>& callback);
+
// Two implementations of CopyTo() in synchronous and asynchronous mode.
// These may copy regions smaller than the requested |src_pixel_subrect| if
// the iosurface is smaller than |src_pixel_subrect|.
