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Java > Open Source Codes > org > columba > core > gui > base > TransparentFilter


1 // The contents of this file are subject to the Mozilla Public License Version
2 // 1.1
3 //(the "License"); you may not use this file except in compliance with the
4 //License. You may obtain a copy of the License at http://www.mozilla.org/MPL/
5 //
6 //Software distributed under the License is distributed on an "AS IS" basis,
7 //WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
8 //for the specific language governing rights and
9 //limitations under the License.
10 //
11 //The Original Code is "The Columba Project"
12 //
13 //The Initial Developers of the Original Code are Frederik Dietz and Timo
14 // Stich.
15 //Portions created by Frederik Dietz and Timo Stich are Copyright (C) 2003.
16 //
17 //All Rights Reserved.
18 package org.columba.core.gui.base;
19
20 import java.awt.image.RGBImageFilter JavaDoc;
21
22
23 /** Filter that adds transparency */
24 class TransparentFilter extends RGBImageFilter JavaDoc {
25     int percent;
26
27     public TransparentFilter(int percent) {
28         canFilterIndexColorModel = true;
29         this.percent = percent;
30     }
31
32     public int filterRGB(int x, int y, int rgb) {
33         int alpha;
34
35         alpha = (rgb >> 24) & 0xff;
36         alpha = Math.min(255, (int) (alpha * percent) / 100);
37
38         return (rgb & 0xffffff) + (alpha << 24);
39     }
40 }
41
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