color.h

/*************************************************************************/
/*  color.h                                                              */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2016 Juan Linietsky, Ariel Manzur.                 */
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/*************************************************************************/
#ifndef COLOR_H
#define COLOR_H

#include "ustring.h"
#include "math_funcs.h"
struct Color {

    union {

        struct {
            float r;
            float g;
            float b;
            float a;
        };
        float components[4];
    };

    bool operator==(const Color &p_color) const { return (r==p_color.r && g==p_color.g && b==p_color.b && a==p_color.a ); }
    bool operator!=(const Color &p_color) const { return (r!=p_color.r || g!=p_color.g || b!=p_color.b || a!=p_color.a ); }

    uint32_t to_32() const;
    uint32_t to_ARGB32() const;
    float gray() const;
    float get_h() const;
    float get_s() const;
    float get_v() const;
    void set_hsv(float p_h, float p_s, float p_v, float p_alpha=1.0);

    _FORCE_INLINE_ float& operator[](int idx) {
        return components[idx];
    }
    _FORCE_INLINE_ const float& operator[](int idx) const {
        return components[idx];
    }

    void invert();
    void contrast();
    Color inverted() const;
    Color contrasted() const;

    _FORCE_INLINE_ Color linear_interpolate(const Color& p_b, float p_t) const {

        Color res=*this;

        res.r+= (p_t * (p_b.r-r));
        res.g+= (p_t * (p_b.g-g));
        res.b+= (p_t * (p_b.b-b));
        res.a+= (p_t * (p_b.a-a));

        return res;
    }

    _FORCE_INLINE_ Color blend(const Color& p_over) const {


        Color res;
        float sa = 1.0 - p_over.a;
        res.a = a*sa+p_over.a;
        if (res.a==0) {
            return Color(0,0,0,0);
        } else {
            res.r = (r*a*sa + p_over.r * p_over.a)/res.a;
            res.g = (g*a*sa + p_over.g * p_over.a)/res.a;
            res.b = (b*a*sa + p_over.b * p_over.a)/res.a;
        }
        return res;
    }

    _FORCE_INLINE_ Color to_linear() const {

        return Color(
            r<0.04045 ? r * (1.0 / 12.92) : Math::pow((r + 0.055) * (1.0 / (1 + 0.055)), 2.4),
            g<0.04045 ? g * (1.0 / 12.92) : Math::pow((g + 0.055) * (1.0 / (1 + 0.055)), 2.4),
            b<0.04045 ? b * (1.0 / 12.92) : Math::pow((b + 0.055) * (1.0 / (1 + 0.055)), 2.4),
            a
        );
    }

    static Color hex(uint32_t p_hex);
    static Color html(const String& p_color);
    static bool html_is_valid(const String& p_color);
    String to_html(bool p_alpha=true) const;

    _FORCE_INLINE_ bool operator<(const Color& p_color) const; //used in set keys
    operator String() const;

    _FORCE_INLINE_ Color() {
        r=0; g=0; b=0; a=1.0;
    }

    _FORCE_INLINE_ Color(float p_r,float p_g,float p_b,float p_a=1.0) { r=p_r; g=p_g; b=p_b; a=p_a; }
};

bool Color::operator<(const Color& p_color) const {

    if (r==p_color.r) {
        if (g==p_color.g) {
            if(b==p_color.b) {
                return (a<p_color.a);
            } else
                return (b<p_color.b);
        } else
            return g<p_color.g;
    } else
        return r<p_color.r;

}

#endif