third_party/WebKit/Source/core/html/ImageDocument.h

/*
 * Copyright (C) 2006, 2007, 2008, 2009 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 COMPUTER, 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 COMPUTER, INC. OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * 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.
 */

#ifndef ImageDocument_h
#define ImageDocument_h

#include "core/html/HTMLDocument.h"
#include "core/html/HTMLImageElement.h"
#include "wtf/RefPtr.h"

namespace blink {

class ImageResource;

class CORE_EXPORT ImageDocument final : public HTMLDocument {
public:
    static ImageDocument* create(const DocumentInit& initializer = DocumentInit())
    {
        return new ImageDocument(initializer);
    }

    enum ScaleType {
        ScaleZoomedDocument,
        ScaleOnlyUnzoomedDocument
    };

    ImageResource* cachedImage();
    HTMLImageElement* imageElement() const { return m_imageElement.get(); }

    void windowSizeChanged(ScaleType);
    void imageUpdated();
    void imageClicked(int x, int y);

    DECLARE_VIRTUAL_TRACE();

private:
    explicit ImageDocument(const DocumentInit&);

    DocumentParser* createParser() override;

    void createDocumentStructure();

    // These methods are for m_shrinkToFitMode == Desktop.
    void resizeImageToFit(ScaleType);
    void restoreImageSize(ScaleType);
    bool imageFitsInWindow() const;
    bool shouldShrinkToFit() const;
    float scale() const;

    Member<HTMLImageElement> m_imageElement;

    // Whether enough of the image has been loaded to determine its size
    bool m_imageSizeIsKnown;

    // Whether the image is shrunk to fit or not
    bool m_didShrinkImage;

    // Whether the image should be shrunk or not
    bool m_shouldShrinkImage;

    enum ShrinkToFitMode {
        Viewport,
        Desktop
    };
    ShrinkToFitMode m_shrinkToFitMode;
};

DEFINE_DOCUMENT_TYPE_CASTS(ImageDocument);

} // namespace blink

#endif // ImageDocument_h