Source/WebCore/platform/image-decoders/ScalableImageDecoderFrame.h

/*
 * Copyright (C) 2016 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. ``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
 * 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
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#pragma once

#include "Color.h"
#include "DecodingOptions.h"
#include "ImageBackingStore.h"
#include "ImageOrientation.h"
#include "ImageTypes.h"
#include "IntSize.h"
#include "NativeImage.h"
#include <wtf/Seconds.h>

namespace WebCore {

class ScalableImageDecoderFrame {
public:
    ScalableImageDecoderFrame();
    ScalableImageDecoderFrame(const ScalableImageDecoderFrame& other) { operator=(other); }

    ~ScalableImageDecoderFrame();

    ScalableImageDecoderFrame& operator=(const ScalableImageDecoderFrame& other);

    void clear();

    bool initialize(const ImageBackingStore&);
    bool initialize(const IntSize&, bool premultiplyAlpha);

    void setDecodingStatus(DecodingStatus);
    DecodingStatus decodingStatus() const;

    bool isInvalid() const { return m_decodingStatus == DecodingStatus::Invalid; }
    bool isPartial() const { return m_decodingStatus == DecodingStatus::Partial; }
    bool isComplete() const { return m_decodingStatus == DecodingStatus::Complete; }

    IntSize size() const;

    enum class DisposalMethod { Unspecified, DoNotDispose, RestoreToBackground, RestoreToPrevious };
    void setDisposalMethod(DisposalMethod method) { m_disposalMethod = method; }
    DisposalMethod disposalMethod() const { return m_disposalMethod; }

    void setOrientation(ImageOrientation orientation) { m_orientation = orientation; };
    ImageOrientation orientation() const { return m_orientation; }

    void setDuration(const Seconds& duration) { m_duration = duration; }
    Seconds duration() const { return m_duration; }

    void setHasAlpha(bool hasAlpha) { m_hasAlpha = hasAlpha; }
    bool hasAlpha() const { return !hasMetadata() || m_hasAlpha; }
    bool hasMetadata() const { return !size().isEmpty(); }

    ImageBackingStore* backingStore() const { return m_backingStore ? m_backingStore.get() : nullptr; }
    bool hasBackingStore() const { return backingStore(); }

private:
    DecodingStatus m_decodingStatus { DecodingStatus::Invalid };

    std::unique_ptr<ImageBackingStore> m_backingStore;
    DisposalMethod m_disposalMethod { DisposalMethod::Unspecified };

    ImageOrientation m_orientation { ImageOrientation::None };
    Seconds m_duration;
    bool m_hasAlpha { true };
};

}