Add ImageBitmapRenderingContext (experimental)

third_party/WebKit/Source/modules/imagebitmap/ImageBitmapRenderingContext.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 ImageBitmapRenderingContext_h
+#define ImageBitmapRenderingContext_h
+
+#include "core/html/canvas/CanvasRenderingContext.h"
+#include "core/html/canvas/CanvasRenderingContextFactory.h"
+#include "modules/ModulesExport.h"
+#include "wtf/RefPtr.h"
+
+namespace blink {
+
+class ImageBitmap;
+
+class MODULES_EXPORT ImageBitmapRenderingContext final : public CanvasRenderingContext {
+    DEFINE_WRAPPERTYPEINFO();
+public:
+    class Factory : public CanvasRenderingContextFactory {
+        WTF_MAKE_NONCOPYABLE(Factory);
+    public:
+        Factory() {}
+        ~Factory() override {}
+
+        PassOwnPtrWillBeRawPtr<CanvasRenderingContext> create(HTMLCanvasElement*, const CanvasContextCreationAttributes&, Document&) override;
+        CanvasRenderingContext::ContextType contextType() const override { return CanvasRenderingContext::ContextImageBitmap; }
+        void onError(HTMLCanvasElement*, const String& error) override { }
+    };
+
+    // Script API
+    void transferImageBitmap(ImageBitmap*);
+
+    // CanvasRenderingContext implementation
+    ContextType contextType() const override { return CanvasRenderingContext::ContextImageBitmap; }
+    bool hasAlpha() const override { return m_hasAlpha; }
+    void setIsHidden(bool) override { }
+    bool isContextLost() const override { return false; }
+    bool paint(GraphicsContext&, const IntRect&) override;
+
+    // TODO(junov): Implement GPU accelerated rendering using a layer bridge
+    WebLayer* platformLayer() const override { return nullptr; }
+    // TODO(junov): handle lost contexts when content is GPU-backed
+    void loseContext(LostContextMode) override { }
+
+    void stop() override;
+
+    virtual ~ImageBitmapRenderingContext();
+
+private:
+    ImageBitmapRenderingContext(HTMLCanvasElement*, CanvasContextCreationAttributes, Document&);
+
+    bool m_hasAlpha;
+    RefPtr<Image> m_image;
+};
+
+} // blink
+
+#endif