MediaStream Image Capture (2): Platform::ImageCaptureFrameGrabber and grabFrame()

third_party/WebKit/public/platform/Platform.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 60 matching lines @@
 class WebDatabaseObserver;
 class WebPlatformEventListener;
 class WebFallbackThemeEngine;
 class WebFileSystem;
 class WebFileUtilities;
 class WebFlingAnimator;
 class WebGeofencingProvider;
 class WebGestureCurve;
 class WebGraphicsContext3DProvider;
 class WebIDBFactory;
+class WebImageCaptureFrameGrabber;
 class WebInstalledApp;
 class WebMIDIAccessor;
 class WebMIDIAccessorClient;
 class WebMediaPlayer;
 class WebMediaRecorderHandler;
 class WebMediaStream;
 class WebMediaStreamCenter;
 class WebMediaStreamCenterClient;
 class WebMediaStreamTrack;
 class WebMemoryDumpProvider;
@@ skipping 401 matching lines @@
     virtual WebCompositorSupport* compositorSupport() { return nullptr; }
 
     virtual WebFlingAnimator* createFlingAnimator() { return nullptr; }
 
     // Creates a new fling animation curve instance for device |deviceSource|
     // with |velocity| and already scrolled |cumulativeScroll| pixels.
     virtual WebGestureCurve* createFlingAnimationCurve(WebGestureDevice deviceSource, const WebFloatPoint& velocity, const WebSize& cumulativeScroll) { return nullptr; }
 
     // WebRTC ----------------------------------------------------------
 
-    // Creates an WebRTCPeerConnectionHandler for RTCPeerConnection.
+    // Creates a WebRTCPeerConnectionHandler for RTCPeerConnection.
     // May return null if WebRTC functionality is not avaliable or if it's out of resources.
     virtual WebRTCPeerConnectionHandler* createRTCPeerConnectionHandler(WebRTCPeerConnectionHandlerClient*) { return nullptr; }
 
-    // Creates an WebMediaRecorderHandler to record MediaStreams.
+    // Creates a WebMediaRecorderHandler to record MediaStreams.
     // May return null if the functionality is not available or out of resources.
     virtual WebMediaRecorderHandler* createMediaRecorderHandler() { return nullptr; }
 
     // May return null if WebRTC functionality is not available or out of resources.
     virtual WebRTCCertificateGenerator* createRTCCertificateGenerator() { return nullptr; }
 
     // May return null if WebRTC functionality is not available or out of resources.
     virtual WebMediaStreamCenter* createMediaStreamCenter(WebMediaStreamCenterClient*) { return nullptr; }
 
-    // Creates an WebCanvasCaptureHandler to capture Canvas output.
+    // Creates a WebCanvasCaptureHandler to capture Canvas output.
     virtual WebCanvasCaptureHandler* createCanvasCaptureHandler(const WebSize&, double, WebMediaStreamTrack*) { return nullptr; }
 
     // Fills in the WebMediaStream to capture from the WebMediaPlayer identified
     // by the second parameter.
     virtual void createHTMLVideoElementCapturer(WebMediaStream*, WebMediaPlayer*) {}
 
+    // Creates a WebImageCaptureFrameGrabber to take a snapshot of a Video Tracks.
+    // May return null if the functionality is not available.
+    virtual WebImageCaptureFrameGrabber* createImageCaptureFrameGrabber() { return nullptr; }
+
     // WebWorker ----------------------------------------------------------
 
     virtual void didStartWorkerThread() { }
     virtual void willStopWorkerThread() { }
 
     // WebCrypto ----------------------------------------------------------
 
     virtual WebCrypto* crypto() { return nullptr; }
 
     // Mojo ---------------------------------------------------------------
@@ skipping 84 matching lines @@
 protected:
     Platform();
     virtual ~Platform() { }
 
     WebThread* m_mainThread;
 };
 
 } // namespace blink
 
 #endif