/* ScummVM - Graphic Adventure Engine
 *
 * ScummVM 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 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://www.gnu.org/licenses/>.
 *
 */

#ifndef GRAPHICS_CONVERSION_H
#define GRAPHICS_CONVERSION_H

#include "common/util.h"

namespace Graphics {

/**
 * @defgroup graphics_conversion Conversions
 * @ingroup graphics
 *
 * @brief Graphics conversion operations.
 *
 * @{
 */

/** Converting a color from YUV to RGB colorspace. */
inline static void YUV2RGB(byte y, byte u, byte v, byte &r, byte &g, byte &b) {
	r = CLIP<int>(y + ((1357 * (v - 128)) >> 10), 0, 255);
	g = CLIP<int>(y - (( 691 * (v - 128)) >> 10) - ((333 * (u - 128)) >> 10), 0, 255);
	b = CLIP<int>(y + ((1715 * (u - 128)) >> 10), 0, 255);
}

/** Converting a color from RGB to YUV colorspace. */
inline static void RGB2YUV(byte r, byte g, byte b, byte &y, byte &u, byte &v) {
	y = CLIP<int>( ((r * 306) >> 10) + ((g * 601) >> 10) + ((b * 117) >> 10)      , 0, 255);
	u = CLIP<int>(-((r * 172) >> 10) - ((g * 340) >> 10) + ((b * 512) >> 10) + 128, 0, 255);
	v = CLIP<int>( ((r * 512) >> 10) - ((g * 429) >> 10) - ((b *  83) >> 10) + 128, 0, 255);
}

/** @} */
} // End of namespace Graphics

#endif // GRAPHICS_CONVERSION_H