ImageBitmap.h   [plain text]

/*
 * Copyright (C) 2017 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "IDLTypes.h"
#include "ImageBuffer.h"
#include "ScriptWrappable.h"
#include <wtf/RefCounted.h>

namespace JSC {
class ArrayBuffer;
}

using JSC::ArrayBuffer;

namespace WebCore {

class Blob;
class CanvasBase;
class HTMLCanvasElement;
class HTMLImageElement;
class HTMLVideoElement;
class ImageBitmapImageObserver;
class ImageData;
class IntRect;
class IntSize;
#if ENABLE(OFFSCREEN_CANVAS)
class OffscreenCanvas;
#endif
class PendingImageBitmap;
class ScriptExecutionContext;
class TypedOMCSSImageValue;
struct ImageBitmapOptions;

template<typename IDLType> class DOMPromiseDeferred;

class ImageBitmap final : public ScriptWrappable, public RefCounted<ImageBitmap> {
    WTF_MAKE_ISO_ALLOCATED(ImageBitmap);
public:
    using Source = Variant<
        RefPtr<HTMLImageElement>,
#if ENABLE(VIDEO)
        RefPtr<HTMLVideoElement>,
#endif
        RefPtr<HTMLCanvasElement>,
        RefPtr<ImageBitmap>,
#if ENABLE(OFFSCREEN_CANVAS)
        RefPtr<OffscreenCanvas>,
#endif
#if ENABLE(CSS_TYPED_OM)
        RefPtr<TypedOMCSSImageValue>,
#endif
        RefPtr<Blob>,
        RefPtr<ImageData>
    >;

    using Promise = DOMPromiseDeferred<IDLInterface<ImageBitmap>>;

    static void createPromise(ScriptExecutionContext&, Source&&, ImageBitmapOptions&&, Promise&&);
    static void createPromise(ScriptExecutionContext&, Source&&, ImageBitmapOptions&&, int sx, int sy, int sw, int sh, Promise&&);

    static Ref<ImageBitmap> create(IntSize);
    static Ref<ImageBitmap> create(std::pair<std::unique_ptr<ImageBuffer>, ImageBuffer::SerializationState>&&);

    ~ImageBitmap();

    unsigned width() const;
    unsigned height() const;
    void close();

    bool isDetached() const { return m_detached; }

    ImageBuffer* buffer() { return m_bitmapData.get(); }

    bool originClean() const { return m_originClean; }

    bool premultiplyAlpha() const { return m_premultiplyAlpha; }

    // When WebGL consumes an Image coming from an ImageBitmap's ImageBuffer, it typically honors
    // the alpha mode of that native image - CGImageAlphaInfo in the Core Graphics backend. For
    // ImageBitmaps created from ImageBitmaps, this information is not accurate, and callers must be
    // told to ignore the alpha mode, and forcibly premultiply the alpha channel.
    bool forciblyPremultiplyAlpha() const { return m_forciblyPremultiplyAlpha; }

    std::unique_ptr<ImageBuffer> transferOwnershipAndClose();

    static Vector<std::pair<std::unique_ptr<ImageBuffer>, ImageBuffer::SerializationState>> detachBitmaps(Vector<RefPtr<ImageBitmap>>&&);

private:
    friend class ImageBitmapImageObserver;
    friend class PendingImageBitmap;

    static Ref<ImageBitmap> create(std::unique_ptr<ImageBuffer>&&);
    ImageBitmap(std::unique_ptr<ImageBuffer>&&);

    static void resolveWithBlankImageBuffer(bool originClean, Promise&&);

    static void createPromise(ScriptExecutionContext&, RefPtr<HTMLImageElement>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
#if ENABLE(VIDEO)
    static void createPromise(ScriptExecutionContext&, RefPtr<HTMLVideoElement>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
#endif
    static void createPromise(ScriptExecutionContext&, RefPtr<ImageBitmap>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
    static void createPromise(ScriptExecutionContext&, RefPtr<HTMLCanvasElement>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
#if ENABLE(OFFSCREEN_CANVAS)
    static void createPromise(ScriptExecutionContext&, RefPtr<OffscreenCanvas>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
#endif
    static void createPromise(ScriptExecutionContext&, CanvasBase&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
    static void createPromise(ScriptExecutionContext&, RefPtr<Blob>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
    static void createPromise(ScriptExecutionContext&, RefPtr<ImageData>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
    static void createPromise(ScriptExecutionContext&, RefPtr<TypedOMCSSImageValue>&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);
    static void createFromBuffer(Ref<ArrayBuffer>&&, String mimeType, long long expectedContentLength, const URL&, ImageBitmapOptions&&, Optional<IntRect>, Promise&&);

    std::unique_ptr<ImageBuffer> m_bitmapData;
    bool m_detached { false };
    bool m_originClean { true };
    bool m_premultiplyAlpha { false };
    bool m_forciblyPremultiplyAlpha { false };
};

}