Make OffscreenCanvas Transferable

third_party/WebKit/Source/bindings/modules/v8/TransferableOffscreenCanvas.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 TransferableOffscreenCanvas_h
+#define TransferableOffscreenCanvas_h
+
+#include "bindings/core/v8/ScriptValueSerializer.h"
+#include "bindings/core/v8/SerializedScriptValue.h"
+#include "bindings/core/v8/Transferable.h"
+#include "modules/ModulesExport.h"
+#include "modules/offscreencanvas/OffscreenCanvas.h"
+
+namespace blink {
+
+class MODULES_EXPORT TransferableOffscreenCanvas : public Transferable {
+public:
+    ~TransferableOffscreenCanvas() override { }
+    void append(OffscreenCanvas* offscreenCanvas)
+    {
+        m_offscreenCanvasArray.append(offscreenCanvas);
+    }
+    bool contains(OffscreenCanvas* offscreenCanvas)
+    {
+        return m_offscreenCanvasArray.contains(offscreenCanvas);
+    }
+    static TransferableOffscreenCanvas* ensure(TransferableArray& transferables)
+    {
+        if (transferables.size() <= ScriptValueSerializer::TransferableOffscreenCanvasType) {
+            transferables.resize(ScriptValueSerializer::TransferableOffscreenCanvasType + 1);
+            transferables[ScriptValueSerializer::TransferableOffscreenCanvasType] = new TransferableOffscreenCanvas();
+        }
+        return static_cast<TransferableOffscreenCanvas*>(transferables[ScriptValueSerializer::TransferableOffscreenCanvasType].get());
+    }
+    static TransferableOffscreenCanvas* get(const TransferableArray& transferables)
+    {
+        if (transferables.size() <= ScriptValueSerializer::TransferableOffscreenCanvasType)
+            return nullptr;
+        return static_cast<TransferableOffscreenCanvas*>(transferables[ScriptValueSerializer::TransferableOffscreenCanvasType].get());
+    }
+    HeapVector<Member<OffscreenCanvas>, 1>& getArray()
+    {
+        return m_offscreenCanvasArray;
+    }
+    DEFINE_INLINE_TRACE()
+    {
+        visitor->trace(m_offscreenCanvasArray);
+        Transferable::trace(visitor);
+    }
+private:
+    HeapVector<Member<OffscreenCanvas>, 1> m_offscreenCanvasArray;
+};
+
+} // namespace blink
+
+#endif // TransferableOffscreenCanvas_h