sky/engine/platform/geometry/IntSize.h

/*
 * Copyright (C) 2003, 2004, 2005, 2006 Apple Computer, Inc.  All rights reserved.
 * Copyright (C) 2013 Google 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,
 * 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.
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#ifndef SKY_ENGINE_PLATFORM_GEOMETRY_INTSIZE_H_
#define SKY_ENGINE_PLATFORM_GEOMETRY_INTSIZE_H_

#include "sky/engine/platform/PlatformExport.h"
#include "sky/engine/public/platform/WebCommon.h"

namespace blink {

class PLATFORM_EXPORT IntSize {
public:
    IntSize() : m_width(0), m_height(0) { }
    IntSize(int width, int height) : m_width(width), m_height(height) { }

    int width() const { return m_width; }
    int height() const { return m_height; }

    void setWidth(int width) { m_width = width; }
    void setHeight(int height) { m_height = height; }

    bool isEmpty() const { return m_width <= 0 || m_height <= 0; }
    bool isZero() const { return !m_width && !m_height; }

    float aspectRatio() const { return static_cast<float>(m_width) / static_cast<float>(m_height); }

    void expand(int width, int height)
    {
        m_width += width;
        m_height += height;
    }

    void scale(float widthScale, float heightScale)
    {
        m_width = static_cast<int>(static_cast<float>(m_width) * widthScale);
        m_height = static_cast<int>(static_cast<float>(m_height) * heightScale);
    }

    void scale(float scale)
    {
        this->scale(scale, scale);
    }

    IntSize expandedTo(const IntSize& other) const
    {
        return IntSize(m_width > other.m_width ? m_width : other.m_width,
            m_height > other.m_height ? m_height : other.m_height);
    }

    IntSize shrunkTo(const IntSize& other) const
    {
        return IntSize(m_width < other.m_width ? m_width : other.m_width,
            m_height < other.m_height ? m_height : other.m_height);
    }

    void clampNegativeToZero()
    {
        *this = expandedTo(IntSize());
    }

    void clampToMinimumSize(const IntSize& minimumSize)
    {
        if (m_width < minimumSize.width())
            m_width = minimumSize.width();
        if (m_height < minimumSize.height())
            m_height = minimumSize.height();
    }

    // Return area in a uint64_t to avoid overflow.
    uint64_t area() const
    {
        return static_cast<uint64_t>(width()) * height();
    }

    int diagonalLengthSquared() const
    {
        return m_width * m_width + m_height * m_height;
    }

    IntSize transposedSize() const
    {
        return IntSize(m_height, m_width);
    }

private:
    int m_width, m_height;
};

inline IntSize& operator+=(IntSize& a, const IntSize& b)
{
    a.setWidth(a.width() + b.width());
    a.setHeight(a.height() + b.height());
    return a;
}

inline IntSize& operator-=(IntSize& a, const IntSize& b)
{
    a.setWidth(a.width() - b.width());
    a.setHeight(a.height() - b.height());
    return a;
}

inline IntSize operator+(const IntSize& a, const IntSize& b)
{
    return IntSize(a.width() + b.width(), a.height() + b.height());
}

inline IntSize operator-(const IntSize& a, const IntSize& b)
{
    return IntSize(a.width() - b.width(), a.height() - b.height());
}

inline IntSize operator-(const IntSize& size)
{
    return IntSize(-size.width(), -size.height());
}

inline bool operator==(const IntSize& a, const IntSize& b)
{
    return a.width() == b.width() && a.height() == b.height();
}

inline bool operator!=(const IntSize& a, const IntSize& b)
{
    return a.width() != b.width() || a.height() != b.height();
}

} // namespace blink

#endif  // SKY_ENGINE_PLATFORM_GEOMETRY_INTSIZE_H_