Basic use implementation for MediaStream from Canvas: captureStream()

third_party/WebKit/Source/modules/mediacapturefromelement/AutoCanvasDrawListener.h

Index: third_party/WebKit/Source/modules/mediacapturefromelement/AutoCanvasDrawListener.h
diff --git a/third_party/WebKit/Source/modules/mediacapturefromelement/AutoCanvasDrawListener.h b/third_party/WebKit/Source/modules/mediacapturefromelement/AutoCanvasDrawListener.h
new file mode 100644
index 0000000000000000000000000000000000000000..bf5f15962eeca4ad7209062ddc1c059408347fee
--- /dev/null
+++ b/third_party/WebKit/Source/modules/mediacapturefromelement/AutoCanvasDrawListener.h
@@ -0,0 +1,32 @@
+// Copyright 2015 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 AutoCanvasDrawListener_h
+#define AutoCanvasDrawListener_h
+
+#include "core/html/canvas/CanvasDrawListener.h"
+#include "platform/heap/Handle.h"
+#include "public/platform/WebCanvasCaptureHandler.h"
+#include "wtf/Noncopyable.h"
+
+namespace blink {
+
+class AutoCanvasDrawListener final : public GarbageCollectedFinalized<AutoCanvasDrawListener>, public CanvasDrawListener {

[esprehn, 2015/12/01 20:04:27]

Auto? I'm not sure what that means in this context.

[emircan, 2015/12/01 21:07:34]

captureStream(): We listen to each canvas frame change.
captureStream(frameRate): We have a fixed frame rate to respect to.
captureStream(0): We listen only when requested.

I was thinking of AutoCanvasDrawListener, TimedCanvasDrawListener and
OnDemandCanvasDrawListener as the names. WDYT?

+    USING_GARBAGE_COLLECTED_MIXIN(AutoCanvasDrawListener);
+public:
+    static AutoCanvasDrawListener* create(const PassOwnPtr<WebCanvasCaptureHandler>&);
+    ~AutoCanvasDrawListener() {}
+    bool needsNewFrameCapture() const override;
+    void setNewFrameCapture(const WTF::PassRefPtr<SkImage>&) override;
+
+    DEFINE_INLINE_TRACE() {}
+private:
+    AutoCanvasDrawListener(const PassOwnPtr<WebCanvasCaptureHandler>&);
+
+    OwnPtr<WebCanvasCaptureHandler> m_handler;
+};
+
+} // namespace blink
+
+#endif