Source/WebCore/platform/graphics/ImageResolution.h

/*
 * Copyright (C) 2020 Cloudinary 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 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 OR ITS CONTRIBUTORS BE LIABLE FOR ANY
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 */

#pragma once

#include "AffineTransform.h"
#include "FloatSize.h"
#include "IntSize.h"

namespace WebCore {

struct ImageResolution {
    static constexpr unsigned DefaultResolution = 72;

    // Since this class is to be used mainly with EXIF,
    // this range intentionally matches the resolution values from the EXIF spec.
    // See JEITA CP-3451, page 18. http://www.exif.org/Exif2-2.PDF

    enum ResolutionUnit {
        None = 1,
        Inches = 2,
        Centimeters = 3
    };

    struct ResolutionMetadata {
        FloatSize preferredSize;
        FloatSize resolution;
        ResolutionUnit resolutionUnit;
    };

    static std::optional<IntSize> densityCorrectedSize(const FloatSize& sourceSize, const ResolutionMetadata&);
};

} // namespace WebCore