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 * A filter which replaces one color by another in an image. This is frankly, not often useful, but has its occasional
049 * uses when dealing with GIF transparency and the like.
050 */
051public class MapColorsFilter extends PointFilter  implements DynFiltering {
052
053        private int oldColor;
054        private int newColor;
055        
056        /**
057     * Construct a MapColorsFilter.
058     */
059    public MapColorsFilter() {
060                this( 0xffffffff, 0xff000000 );
061        }
062        
063        /**
064     * Construct a MapColorsFilter.
065     * @param oldColor the color to replace
066     * @param newColor the color to replace it with
067     */
068        public MapColorsFilter(int oldColor, int newColor) {
069                canFilterIndexColorModel = true;
070                this.oldColor = oldColor;
071                this.newColor = newColor;
072        }
073
074        public int filterRGB(int x, int y, int rgb) {
075                if (rgb == oldColor)
076                        return newColor;
077                return rgb;
078        }
079        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
080                Object o;
081                if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){
082                        int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions");
083                        setDimensions(dim[0],dim[1]);
084                }
085
086                // check for arguments not supported
087                if(parameters.size()>0) {
088                        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 [Dimensions]");
089                }
090
091                return filter(src, dst);
092        }
093}
094