/*
 * dxr3tools.h
 *
 * Copyright (C) 2004 Christian Gmeiner
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 */

#ifndef _DXR3TOOLS_H_
#define _DXR3TOOLS_H_

#include <string>
#include <vdr/status.h>

namespace Tools
{
    // ==================================
    //! convert Rgb to CrCb
    inline unsigned int Rgb2YCrCb(unsigned long rgb)
    {
	float Y,U,V;
	float R,G,B;
	unsigned int yuv = 0x0;

	B = ((rgb >> 16) & 0xFF);
	G = ((rgb >> 8) & 0xFF);
	R = (rgb & 0xFF);

	Y = (0.2578125 * R) + (0.50390625 * G) + (0.09765625 * B) + 16;
	U = (0.4375 * R) - (0.3671875 * G) - (0.0703125 * B) + 128;
	V =-(0.1484375 * R) - (0.2890625 * G) + (0.4375 * B) + 128;

	yuv = (int(Y) << 16) | (int(U) << 8) | int(V);

	return yuv;
    }

    // ==================================
    //! convert YUV to Rgb
    inline unsigned int YUV2Rgb(unsigned int yuv_color)
    {
	int Y, Cb, Cr;
	int Ey, Epb, Epr;
	int Eg, Eb, Er;

	Y = (yuv_color >> 16) & 0xff;
	Cb = (yuv_color) & 0xff;
	Cr = (yuv_color >> 8) & 0xff;

	Ey = (Y - 16);
	Epb = (Cb - 128);
	Epr = (Cr - 128);
	/* ITU-R 709
	   Eg = (298*Ey - 55*Epb - 137*Epr)/256;
	   Eb = (298*Ey + 543*Epb)/256;
	   Er = (298*Ey + 460*Epr)/256;
	*/
	/* FCC ~= mediaLib */
	Eg = (298 * Ey - 100 * Epb - 208 * Epr) / 256;
	Eb = (298 * Ey + 516 * Epb) / 256;
	Er = (298 * Ey + 408 * Epr) / 256;

	if (Eg > 255)
	    Eg = 255;
	if (Eg < 0)
	    Eg = 0;

	if (Eb > 255)
	    Eb = 255;
	if (Eb < 0)
	    Eb = 0;

	if (Er > 255)
	    Er = 255;
	if (Er < 0)
	    Er = 0;

	return Eb | (Eg << 8) | (Er << 16);
    }

    // ==================================
    //! write a string via vdr to OSD
    inline void WriteInfoToOsd(std::string x)
    {
	Skins.Message(mtInfo, x.c_str());
    }

}

#endif /*_DXR3TOOLS_H_*/

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