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/*
* This file is part of the Colobot: Gold Edition source code
* Copyright (C) 2001-2014, Daniel Roux, EPSITEC SA & TerranovaTeam
* http://epsiteс.ch; http://colobot.info; http://github.com/colobot
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://gnu.org/licenses
*/
/**
* \file graphics/core/color.h
* \brief Color structs and related functions
*/
#pragma once
#include <sstream>
// Graphics module namespace
namespace Gfx {
/**
* \struct Color
* \brief RGBA color
*/
struct Color
{
//! Red, green, blue and alpha components
float r, g, b, a;
//! Constructor; default values are (0,0,0,0) = black
explicit Color(float aR = 0.0f, float aG = 0.0f, float aB = 0.0f, float aA = 0.0f)
: r(aR), g(aG), b(aB), a(aA) {}
inline Color Inverse() const
{
return Color(1.0f - r, 1.0f - g, 1.0f - b, 1.0f - a);
}
//! Returns the struct cast to \c float* array; use with care!
inline float* Array()
{
return reinterpret_cast<float*>(this);
}
//! Returns the struct cast to <tt>const float*</tt> array; use with care!
inline const float* Array() const
{
return reinterpret_cast<const float*>(this);
}
//! Returns a string (r, g, b, a)
inline std::string ToString() const
{
std::stringstream s;
s.precision(3);
s << "(" << r << ", " << g << ", " << b << ", " << a << ")";
return s.str();
}
inline bool operator==(const Color &other) const
{
return r == other.r && g == other.g && b == other.b && a == other.a;
}
inline bool operator!=(const Color &other) const
{
return ! this->operator==(other);
}
inline Color operator*(float scale) const
{
Color c = *this;
c.r *= scale;
c.g *= scale;
c.b *= scale;
c.a *= scale;
return c;
}
};
/**
* \struct IntColor
* \brief Color with integer values
*
* May be used for precise pixel manipulations.
*/
struct IntColor
{
//! Red, green, blue and alpha components
unsigned char r, g, b, a;
//! Constructor; default values are (0,0,0,0) = black
explicit IntColor(unsigned char aR = 0, unsigned char aG = 0, unsigned char aB = 0, unsigned char aA = 0)
: r(aR), g(aG), b(aB), a(aA) {}
};
inline Color IntColorToColor(IntColor color)
{
return Color(color.r / 255.0f, color.g / 255.0f, color.b / 255.0f, color.a / 255.0f);
}
inline IntColor ColorToIntColor(Color color)
{
return IntColor(static_cast<unsigned char>(color.r * 255.0f),
static_cast<unsigned char>(color.g * 255.0f),
static_cast<unsigned char>(color.b * 255.0f),
static_cast<unsigned char>(color.a * 255.0f));
}
inline Color IntensityToColor(float intensity)
{
if (intensity <= 0.0f) return Color(0.0f, 0.0f, 0.0f, 0.0f);
if (intensity >= 1.0f) return Color(1.0f, 1.0f, 1.0f, 1.0f);
return Color(intensity, intensity, intensity, intensity);
}
/**
* \struct ColorHSV
* \brief HSV color
*/
struct ColorHSV
{
float h, s, v;
ColorHSV(float aH = 0.0f, float aS = 0.0f, float aV = 0.0f)
: h(aH), s(aS), v(aV) {}
//! Returns a string "(h, s, v)"
inline std::string ToString() const
{
std::stringstream str;
str.precision(3);
str << "(" << h << ", " << s << ", " << v << ")";
return str.str();
}
};
//! Converts a RGB color to HSV color
ColorHSV RGB2HSV(Color color);
//! Converts a HSV color to RGB color
Color HSV2RGB(ColorHSV color);
} // namespace Gfx
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