001/** 002 * 003 * Copyright (c) 2014, the Railo Company Ltd. All rights reserved. 004 * 005 * This library is free software; you can redistribute it and/or 006 * modify it under the terms of the GNU Lesser General Public 007 * License as published by the Free Software Foundation; either 008 * version 2.1 of the License, or (at your option) any later version. 009 * 010 * This library is distributed in the hope that it will be useful, 011 * but WITHOUT ANY WARRANTY; without even the implied warranty of 012 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 013 * Lesser General Public License for more details. 014 * 015 * You should have received a copy of the GNU Lesser General Public 016 * License along with this library. If not, see <http://www.gnu.org/licenses/>. 017 * 018 **/ 019/* 020* 021 022Licensed under the Apache License, Version 2.0 (the "License"); 023you may not use this file except in compliance with the License. 024You may obtain a copy of the License at 025 026 http://www.apache.org/licenses/LICENSE-2.0 027 028Unless required by applicable law or agreed to in writing, software 029distributed under the License is distributed on an "AS IS" BASIS, 030WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 031See the License for the specific language governing permissions and 032limitations under the License. 033*/ 034 035package lucee.runtime.img.filter;import java.awt.image.BufferedImage; 036 037import lucee.runtime.engine.ThreadLocalPageContext; 038import lucee.runtime.exp.FunctionException; 039import lucee.runtime.exp.PageException; 040import lucee.runtime.img.ImageUtil; 041import lucee.runtime.type.KeyImpl; 042import lucee.runtime.type.Struct; 043import lucee.runtime.type.util.CollectionUtil; 044 045 046 047/** 048 * Sets the opacity (alpha) of every pixel in an image to a constant value. 049 */ 050public class OpacityFilter extends PointFilter implements DynFiltering { 051 052 private int opacity; 053 private int opacity24; 054 055 /** 056 * Construct an OpacityFilter with 50% opacity. 057 */ 058 public OpacityFilter() { 059 this(0x88); 060 } 061 062 /** 063 * Construct an OpacityFilter with the given opacity (alpha). 064 * @param opacity the opacity (alpha) in the range 0..255 065 */ 066 public OpacityFilter(int opacity) { 067 setOpacity(opacity); 068 } 069 070 /** 071 * Set the opacity. 072 * @param opacity the opacity (alpha) in the range 0..255 073 * @see #getOpacity 074 */ 075 public void setOpacity(int opacity) { 076 this.opacity = opacity; 077 opacity24 = opacity << 24; 078 } 079 080 /** 081 * Get the opacity setting. 082 * @return the opacity 083 * @see #setOpacity 084 */ 085 public int getOpacity() { 086 return opacity; 087 } 088 089 public int filterRGB(int x, int y, int rgb) { 090 if ((rgb & 0xff000000) != 0) 091 return (rgb & 0xffffff) | opacity24; 092 return rgb; 093 } 094 095 public String toString() { 096 return "Colors/Transparency..."; 097 } 098 099 public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src); 100 Object o; 101 if((o=parameters.removeEL(KeyImpl.init("Opacity")))!=null)setOpacity(ImageFilterUtil.toIntValue(o,"Opacity")); 102 if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){ 103 int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions"); 104 setDimensions(dim[0],dim[1]); 105 } 106 107 // check for arguments not supported 108 if(parameters.size()>0) { 109 throw new FunctionException(ThreadLocalPageContext.get(), "ImageFilter", 3, "parameters", "the parameter"+(parameters.size()>1?"s":"")+" ["+CollectionUtil.getKeyList(parameters,", ")+"] "+(parameters.size()>1?"are":"is")+" not allowed, only the following parameters are supported [Opacity, Dimensions]"); 110 } 111 112 return filter(src, dst); 113 } 114} 115