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

third_party/WebKit/public/platform/WebImageCaptureFrameGrabber.h

+// Copyright 2016 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 WebImageCaptureFrameGrabber_h
+#define WebImageCaptureFrameGrabber_h
+
+#include "public/platform/WebCallbacks.h"
+#include "public/platform/WebCommon.h"
+
+// Can't use SkImage because that has shared ownership semantics whereas
+// WebCallbacks like moveable-non-copyable types.
+class SkBitmap;
+
+namespace blink {
+
+class WebMediaStreamTrack;
+
+using WebImageCaptureGrabFrameCallbacks = WebCallbacks<std::unique_ptr<SkBitmap>, void>;
+
+// Platform interface of an ImageCapture class for grabFrame() calls.
+class WebImageCaptureFrameGrabber {
+public:
+    virtual ~WebImageCaptureFrameGrabber() { }
+
+    virtual void grabFrame(WebMediaStreamTrack*, WebImageCaptureGrabFrameCallbacks*) = 0;
+};
+
+} // namespace blink
+
+#endif // WebImageCaptureFrameGrabber_h