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/*
 *  MicroEmulator
 *  Copyright (C) 2001 Bartek Teodorczyk 
 *
 *  It is licensed under the following two licenses as alternatives:
 *    1. GNU Lesser General Public License (the "LGPL") version 2.1 or any newer version
 *    2. Apache License (the "AL") Version 2.0
 *
 *  You may not use this file except in compliance with at least one of
 *  the above two licenses.
 *
 *  You may obtain a copy of the LGPL at
 *      http://www.gnu.org/licenses/old-licenses/lgpl-2.1.txt
 *
 *  You may obtain a copy of the AL at
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the LGPL or the AL for the specific language governing permissions and
 *  limitations.
 */
 
package org.microemu.device.swt;

import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.RGB;
import org.microemu.app.ui.swt.ImageFilter;
import org.microemu.app.ui.swt.SwtDeviceComponent;
import org.microemu.device.DeviceFactory;



public final class BWImageFilter implements ImageFilter
{

  private double Yr, Yg, Yb;
  private Color backgroundColor;
  private Color foregroundColor;


  public BWImageFilter ()
	{
    this(0.2126d, 0.7152d, 0.0722d);
  }


  public BWImageFilter (double Yr, double Yg, double Yb)
	{
    this.Yr = Yr;
    this.Yg = Yg;
    this.Yb = Yb;
    backgroundColor = SwtDeviceComponent.getColor(new RGB(
    		((SwtDeviceDisplay) DeviceFactory.getDevice().getDeviceDisplay()).getBackgroundColor().getRed(),
    		((SwtDeviceDisplay) DeviceFactory.getDevice().getDeviceDisplay()).getBackgroundColor().getGreen(),
    		((SwtDeviceDisplay) DeviceFactory.getDevice().getDeviceDisplay()).getBackgroundColor().getBlue()));
    foregroundColor = SwtDeviceComponent.getColor(new RGB(
    		((SwtDeviceDisplay) DeviceFactory.getDevice().getDeviceDisplay()).getForegroundColor().getRed(),
    		((SwtDeviceDisplay) DeviceFactory.getDevice().getDeviceDisplay()).getForegroundColor().getGreen(),
    		((SwtDeviceDisplay) DeviceFactory.getDevice().getDeviceDisplay()).getForegroundColor().getBlue()));
  }


  public RGB filterRGB (int x, int y, RGB rgb)
	{
    int Y = (int)(Yr * rgb.red + Yg * rgb.green + Yb * rgb.blue);
    if (Y > 127) {
    	return backgroundColor.getRGB();
		} else {
	    return foregroundColor.getRGB();
		}
  }

}