path: root/src/utils/color/rgb.cpp

/*
 * UltraStar Deluxe - Karaoke Game
 *
 * UltraStar Deluxe is the legal property of its developers, whose names
 * are too numerous to list here. Please refer to the COPYRIGHT
 * file distributed with this source distribution.
 *
 * 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 2
 * 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; see the file COPYING. If not, write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301, USA.
 *
 */

#include <cstddef>

#include "rgb.hpp"
#include "hsv.hpp"

namespace usdx
{
	RgbColor::RgbColor(uint8_t red, uint8_t green, uint8_t blue)
		: red(red), green(green), blue(blue),
		  array(NULL), array_length(0)
	{
	}

	RgbColor::RgbColor(const uint32_t color)
		: red((color & 0xff0000) >> 16), green((color & 0xff00) >> 8),
		  blue(color & 0xff), array(NULL), array_length(0)
	{
	}

	RgbColor::RgbColor(const RgbColor& color)
		: red(color.red), green(color.green), blue(color.blue), array(NULL),
		  array_length(0)
	{
	}

	RgbColor::RgbColor(const HsvColor& hsv)
		: red(0), green(0), blue(0), array(NULL), array_length(0)
	{
		uint8_t region, fpart, p, q, t;

		if(hsv.get_saturation() == 0) {
			/* color is grayscale */
			red = green = blue = hsv.get_value();
			return;
		}

		/* make hue 0-5 */
		region = hsv.get_value() / 43;

		/* find remainder part, make it from 0-255 */
		fpart = (hsv.get_value() - (region * 43)) * 6;

		/* calculate temp vars, doing integer multiplication */
		p = (hsv.get_value() * (255 - hsv.get_saturation())) >> 8;
		q = (hsv.get_value() * (255 - ((hsv.get_saturation() * fpart) >> 8))) >> 8;
		t = (hsv.get_value() * (255 - ((hsv.get_saturation() * (255 - fpart)) >> 8))) >> 8;

		/* assign temp vars based on color cone region */
		switch(region) {
        case 0:
            red = hsv.get_value(); green = t; blue = p; break;
        case 1:
            red = q; green = hsv.get_value(); blue = p; break;
        case 2:
            red = p; green = hsv.get_value(); blue = t; break;
        case 3:
            red = p; green = q; blue = hsv.get_value(); break;
        case 4:
            red = t; green = p; blue = hsv.get_value(); break;
        default:
            red = hsv.get_value(); green = p; blue = q; break;
		}
	}

	RgbColor::~RgbColor()
	{
		if (array != NULL) {
			delete[] array;
			array = NULL;
		}
	}

	RgbColor& RgbColor::operator=(const RgbColor& color)
	{
		if (this != &color) {
			red = color.red;
			green = color.green;
			blue = color.blue;
			array_length = 0;

			if (array != NULL) {
				delete[] array;
				array = NULL;
			}
		}

		return *this;
	}

	uint8_t RgbColor::get_red(void) const
	{
		return red;
	}

	uint8_t RgbColor::get_green(void) const
	{
		return green;
	}

	uint8_t RgbColor::get_blue(void) const
	{
		return blue;
	}

	const GLubyte* RgbColor::get_array(size_t len) const
	{
		if (array_length != len && array != NULL) {
			delete[] array;
			array = NULL;
			array_length = 0;
		}

		if (array == NULL) {
			int components = get_array_comonent_count();
			array = new GLubyte[len * components];
			array_length = len;

			for (size_t i = 0; i < len; i++) {
				array[i*components] = red;
				array[(i*components) + 1] = green;
				array[(i*components) + 2] = blue;
			}
		}

		return array;
	}

	int RgbColor::get_array_comonent_count(void) const
	{
		return 3;
	}

	bool RgbColor::is_grey(void) const
	{
		return (red == green) && (green == blue);
	}

	bool RgbColor::is_black(void) const
	{
		return (red == 0) && (green == 0) && (blue == 0);
	}

	bool RgbColor::is_white(void) const
	{
		return (red == 255) && (green == 255) && (blue == 255);
	}
}