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 * Copyright (c) 2013, Google Inc. All rights reserved.
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 * 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
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
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 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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 */

#ifndef ImageBitmapFactories_h
#define ImageBitmapFactories_h

#include "bindings/v8/ScriptPromise.h"
#include "bindings/v8/ScriptPromiseResolver.h"
#include "bindings/v8/ScriptState.h"
#include "core/fileapi/FileReaderLoader.h"
#include "core/fileapi/FileReaderLoaderClient.h"
#include "core/platform/Supplementable.h"
#include "core/platform/graphics/IntRect.h"
#include "wtf/Forward.h"
#include "wtf/HashSet.h"

namespace WebCore {

class Blob;
class CanvasRenderingContext2D;
class EventTarget;
class ExceptionState;
class HTMLCanvasElement;
class HTMLImageElement;
class HTMLVideoElement;
class ImageBitmap;
class ImageData;
class ScriptExecutionContext;

class ImageBitmapFactories : public Supplement<DOMWindow>, public Supplement<ScriptExecutionContext> {

class ImageBitmapLoader;

public:
    static ScriptPromise createImageBitmap(EventTarget*, HTMLImageElement*, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, HTMLImageElement*, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, HTMLVideoElement*, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, HTMLVideoElement*, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, CanvasRenderingContext2D*, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, CanvasRenderingContext2D*, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, HTMLCanvasElement*, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, HTMLCanvasElement*, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, Blob*, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, Blob*, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, ImageData*, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, ImageData*, int sx, int sy, int sw, int sh, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, ImageBitmap*, ExceptionState&);
    static ScriptPromise createImageBitmap(EventTarget*, ImageBitmap*, int sx, int sy, int sw, int sh, ExceptionState&);

    void didFinishLoading(ImageBitmapLoader*);

    virtual ~ImageBitmapFactories() { }

private:
    class ImageBitmapLoader : public RefCounted<ImageBitmapLoader>, public FileReaderLoaderClient {
    public:
        static PassRefPtr<ImageBitmapLoader> create(ImageBitmapFactories* factory, PassRefPtr<ScriptPromiseResolver> resolver, const IntRect& cropRect)
        {
            return adoptRef(new ImageBitmapLoader(factory, resolver, cropRect));
        }

        void loadBlobAsync(ScriptExecutionContext*, Blob*);

        ~ImageBitmapLoader() { }

    private:
        ImageBitmapLoader(ImageBitmapFactories*, PassRefPtr<ScriptPromiseResolver>, const IntRect&);

        void rejectPromise();

        // FileReaderLoaderClient
        virtual void didStartLoading() OVERRIDE { }
        virtual void didReceiveData() OVERRIDE { }
        virtual void didFinishLoading() OVERRIDE;
        virtual void didFail(FileError::ErrorCode) OVERRIDE;

        ScriptState* m_scriptState;
        FileReaderLoader m_loader;
        ImageBitmapFactories* m_factory;
        RefPtr<ScriptPromiseResolver> m_resolver;
        IntRect m_cropRect;
    };

    static const char* supplementName();
    static ImageBitmapFactories* from(EventTarget*);

    template <class T>
    static ImageBitmapFactories* fromInternal(T*);

    void addLoader(PassRefPtr<ImageBitmapLoader>);

    HashSet<RefPtr<ImageBitmapLoader> > m_pendingLoaders;
};

} // namespace WebCore

#endif // ImageBitmapFactories_h