arsrgbcolor.cpp

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#include "SdlArs.h"

namespace Ars
{
RGBColor::RGBColor(const Uint32* pColorValue, const SDL_PixelFormat* pFormat)
{
        red = static_cast<unsigned char>((pFormat->Rmask & *pColorValue) >> pFormat->Rshift);
        green = static_cast<unsigned char>((pFormat->Gmask & *pColorValue) >> pFormat->Gshift);
        blue = static_cast<unsigned char>((pFormat->Bmask & *pColorValue) >> pFormat->Bshift);
        alpha = static_cast<unsigned char>((pFormat->Amask & *pColorValue) >> pFormat->Ashift);
}


RGBColor& RGBColor::operator=(const RGBColor& c)
{
        red = c.red;
        green = c.green;
        blue = c.blue;
        alpha = c.alpha;
        return *this;
}


RGBColor RGBColor::operator+(const RGBColor& c) const
{
        double fg_ratio = static_cast<double>(c.alpha) / 0xFF;
        double bg_ratio = static_cast<double>(0xFF - c.alpha) / 0xFF;
        unsigned char new_red = static_cast<unsigned char>(red * bg_ratio + c.red * fg_ratio);
        unsigned char new_green = static_cast<unsigned char>(green * bg_ratio + c.green * fg_ratio);
        unsigned char new_blue = static_cast<unsigned char>(blue * bg_ratio + c.blue * fg_ratio);
        return RGBColor(new_red, new_green, new_blue, alpha);
}


RGBColor RGBColor::operator|(const RGBColor& c) const
{
        return RGBColor(red | c.red, green | c.green, blue | c.blue, alpha | c.alpha);
}


RGBColor RGBColor::operator&(const RGBColor& c) const
{
        return RGBColor(red & c.red, green & c.green, blue & c.blue, alpha & c.alpha);
}


RGBColor RGBColor::operator^(const RGBColor& c) const
{
        return RGBColor(red ^ c.red, green ^ c.green, blue ^ c.blue, alpha ^ c.alpha);
}

RGBColor RGBColor::FadeColor( const int factor ) const
{
        return RGBColor( max( 0 , min( 0xff , red + factor ) ) , max( 0 , min( 0xff , green + factor ) ) , max( 0 , min( 0xff , blue + factor ) ) );
}

}

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