/*
* Created on 24 oct. 2004
* Created by Olivier Chalouhi
*
* Copyright (C) 2004, 2005, 2006 Aelitis SAS, All rights Reserved
*
* 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.
*
* 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 ( see the LICENSE file ).
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* AELITIS, SAS au capital de 46,603.30 euros,
* 8 Allee Lenotre, La Grille Royale, 78600 Le Mesnil le Roi, France.
*/
package org.gudy.azureus2.ui.swt.components.images;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Display;
/**
* @author Olivier Chalouhi
*
*/
public class Utils {
public static Image renderTransparency(Display display,Image background,Image foreground) {
//Checks
if( display == null || display.isDisposed() ||
background == null || background.isDisposed() ||
foreground == null || foreground.isDisposed()
) return null;
Rectangle r1 = background.getBounds();
Rectangle r2 = foreground.getBounds();
if(! r1.equals(r2)) return null;
Image image = new Image(display,r1);
ImageData backData = background.getImageData();
ImageData foreData = foreground.getImageData();
ImageData imgData = image.getImageData();
for(int y = 0 ; y < foreData.height ; y++) {
for(int x = 0 ; x < foreData.width ; x++) {
int cBack = backData.getPixel(x,y);
int cFore = foreData.getPixel(x,y);
int aFore = foreData.getAlpha(x,y);
int rBack = cBack & 0xFF;
int gBack = (cBack >> 8) & 0xFF;
int bBack = (cBack >> 16) & 0xFF;
int rFore = cFore & 0xFF;
int gFore = (cFore >> 8) & 0xFF;
int bFore = (cFore >> 16) & 0xFF;
int r = (rBack * aFore + (255 - aFore) * rFore) / 255;
r = r & 0xFF;
int g = (gBack * aFore + (255 - aFore) * gFore) / 255;
g = g & 0xFF;
int b = (bBack * aFore + (255 - aFore) * bFore) / 255;
b = b & 0xFF;
int color = r + g << 8 + b << 16;
imgData.setPixel(x,y,color);
}
}
return image;
}
}
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