size.h

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/*
 * Copyright © 2012, 2016 Canonical Ltd.
 *
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU Lesser General Public License version 2 or 3,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 * Authored by: Alan Griffiths <alan@octopull.co.uk>
 */
 
#ifndef MIR_GEOMETRY_SIZE_H_
#define MIR_GEOMETRY_SIZE_H_
 
#include "mir/geometry/dimensions.h"
#include "point.h"
#include <iosfwd>
 
namespace mir
{
namespace geometry
{
 
struct Size
{
    constexpr Size() noexcept {}
    constexpr Size(Size const&) noexcept = default;
    Size& operator=(Size const&) noexcept = default;
 
    template<typename WidthType, typename HeightType>
    constexpr Size(WidthType&& width, HeightType&& height) noexcept : width(width), height(height) {}
 
    Width width;
    Height height;
};
 
inline constexpr bool operator == (Size const& lhs, Size const& rhs)
{
    return lhs.width == rhs.width && lhs.height == rhs.height;
}
 
inline constexpr bool operator != (Size const& lhs, Size const& rhs)
{
    return lhs.width != rhs.width || lhs.height != rhs.height;
}
 
std::ostream& operator<<(std::ostream& out, Size const& value);
 
template<typename Scalar>
inline constexpr Size operator*(Scalar scale, Size const& size)
{
    return Size{scale*size.width, scale*size.height};
}
 
template<typename Scalar>
inline constexpr Size operator*(Size const& size, Scalar scale)
{
    return scale*size;
}
 
template<typename Scalar>
inline constexpr Size operator/(Size const& size, Scalar scale)
{
    return Size{size.width / scale, size.height / scale};
}
 
inline constexpr Size as_size(Point const& point)
{
    return Size{point.x.as_int(), point.y.as_int()};
}
 
inline constexpr Point as_point(Size const& size)
{
    return Point{size.width.as_int(), size.height.as_int()};
}
}
}
 
#endif /* MIR_GEOMETRY_SIZE_H_ */