f_color.c

/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   f_color.c                                          :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: sboeuf <marvin@42.fr>                      +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2014/02/16 19:17:55 by sboeuf            #+#    #+#             */
/*   Updated: 2014/02/16 22:06:48 by sboeuf           ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "includes/rtv1.h"

t_color	*color_scalar(double scalar, t_color *c1)
{
	t_color	*c2;

	c2 = new_color(c1->red * scalar, c1->green * scalar,
		c1->blue *scalar, c1->spec);
	return (c2);
}

t_color	*color_add(t_color *c1, t_color *c2)
{
	t_color	*rslt;

	rslt = new_color(c1->red + c2->red, c1->green + c2->green,
		c1->blue + c2->blue, c1->spec);
	return (rslt);
}

t_color	*color_multiply(t_color *c1, t_color *c2)
{
	t_color	*rslt;

	rslt = new_color(c1->red * c2->red, c1->green * c2->green,
		c1->blue * c2->blue, c1->spec);
	return (rslt);
}

t_color	*color_average(t_color *c1, t_color *c2)
{
	t_color	*r;

	r = new_color((c1->red + c2->red) / 2, (c1->green + c2->green) / 2,
			(c1->blue * c2->blue) / 2, c1->spec);
	return (r);
}

t_color	*clip(t_color *c1)
{
	double	all_light;
	double	excess_light;

	all_light = c1->red + c1->green + c1->blue;
	excess_light = all_light - 3;
	if (excess_light > 0)
	{
		c1->red = c1->red + excess_light * (c1->red / all_light);
		c1->green = c1->green + excess_light * (c1->green / all_light);
		c1->blue = c1->blue + excess_light * (c1->blue / all_light);
	}
	c1->red = c1->red < 0 ? 0 : c1->red;
	c1->red = c1->red > 1 ? 1 : c1->red;
	c1->green = c1->green < 0 ? 0 : c1->green;
	c1->green = c1->green > 1 ? 1 : c1->green;
	c1->blue = c1->blue < 0 ? 0 : c1->blue;
	c1->blue = c1->blue > 1 ? 1 : c1->blue;
	return (new_color(c1->red, c1->green, c1->blue, c1->spec));
}