Color.h

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// Color.h
//
// Copyright (c) 2013, 2015 Michael Imamura.
//
// Licensed under GrokkSoft HoverRace SourceCode License v1.0(the "License");
// you may not use this file except in compliance with the License.
//
// A copy of the license should have been attached to the package from which
// you have taken this file. If you can not find the license you can not use
// this file.
//
//
// The author makes no representations about the suitability of
// this software for any purpose.  It is provided "as is" "AS IS",
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
//
// See the License for the specific language governing permissions
// and limitations under the License.

#pragma once

#include "../Util/MR_Types.h"
#include "../Util/SelFmt.h"

#if defined(_WIN32) && defined(HR_ENGINE_SHARED)
#   ifdef MR_ENGINE
#       define MR_DllDeclare   __declspec( dllexport )
#   else
#       define MR_DllDeclare   __declspec( dllimport )
#   endif
#else
#   define MR_DllDeclare
#endif

namespace HoverRace {
namespace Display {

union MR_DllDeclare Color
{
    constexpr Color() noexcept : argb(0) { }
    constexpr Color(MR_UInt32 argb) noexcept : argb(argb) { }
    constexpr Color(MR_UInt8 a, MR_UInt8 r, MR_UInt8 g, MR_UInt8 b) noexcept :
        argb(((MR_UInt32)a << 24) +
            ((MR_UInt32)r << 16) +
            ((MR_UInt32)g << 8) +
            (MR_UInt32)b)
        { }

    Color &operator=(MR_UInt32 argb) noexcept
    {
        this->argb = argb;
        return *this;
    }

    MR_UInt32 argb;
    struct
    {
        MR_UInt8 b, g, r, a;
    } bits;
};

constexpr Color COLOR_WHITE{ 0xff, 0xff, 0xff, 0xff };
constexpr Color COLOR_BLACK{ 0xff, 0x00, 0x00, 0x00 };

MR_DllDeclare inline constexpr bool operator==(const Color &a, const Color &b) noexcept
{
    return a.argb == b.argb;
}

MR_DllDeclare inline constexpr bool operator!=(const Color &a, const Color &b) noexcept
{
    return !operator==(a, b);
}

MR_DllDeclare std::istream &operator>>(std::istream &is, Color &c);

MR_DllDeclare std::ostream &operator<<(std::ostream &os, const Color &c);

}  // namespace Display
}  // namespace HoverRace

#undef MR_DllDeclare