001/* 002Copyright 2006 Jerry Huxtable 003 004Licensed under the Apache License, Version 2.0 (the "License"); 005you may not use this file except in compliance with the License. 006You may obtain a copy of the License at 007 008 http://www.apache.org/licenses/LICENSE-2.0 009 010Unless required by applicable law or agreed to in writing, software 011distributed under the License is distributed on an "AS IS" BASIS, 012WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013See the License for the specific language governing permissions and 014limitations under the License. 015*/ 016 017package com.jhlabs.image; 018 019import java.awt.*; 020import java.awt.image.*; 021 022/** 023 * A Filter to invert the alpha channel of an image. This is really only useful for inverting selections, where we only use the alpha channel. 024 */ 025public class InvertAlphaFilter extends PointFilter { 026 027 public InvertAlphaFilter() { 028 canFilterIndexColorModel = true; 029 } 030 031 public int filterRGB(int x, int y, int rgb) { 032 return rgb ^ 0xff000000; 033 } 034 035 public String toString() { 036 return "Alpha/Invert"; 037 } 038}