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 * Sets the opacity (alpha) of every pixel in an image to a constant value. 024 */ 025public class OpacityFilter extends PointFilter { 026 027 private int opacity; 028 private int opacity24; 029 030 /** 031 * Construct an OpacityFilter with 50% opacity. 032 */ 033 public OpacityFilter() { 034 this(0x88); 035 } 036 037 /** 038 * Construct an OpacityFilter with the given opacity (alpha). 039 * @param opacity the opacity (alpha) in the range 0..255 040 */ 041 public OpacityFilter(int opacity) { 042 setOpacity(opacity); 043 } 044 045 /** 046 * Set the opacity. 047 * @param opacity the opacity (alpha) in the range 0..255 048 * @see #getOpacity 049 */ 050 public void setOpacity(int opacity) { 051 this.opacity = opacity; 052 opacity24 = opacity << 24; 053 } 054 055 /** 056 * Get the opacity setting. 057 * @return the opacity 058 * @see #setOpacity 059 */ 060 public int getOpacity() { 061 return opacity; 062 } 063 064 public int filterRGB(int x, int y, int rgb) { 065 if ((rgb & 0xff000000) != 0) 066 return (rgb & 0xffffff) | opacity24; 067 return rgb; 068 } 069 070 public String toString() { 071 return "Colors/Transparency..."; 072 } 073 074} 075