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 uses the brightness of each pixel to lookup a color from a colormap. 
049 */
050public class LookupFilter extends PointFilter  implements DynFiltering {
051        
052        private Colormap colormap = new Gradient();
053        
054        /**
055     * Construct a LookupFilter.
056     */
057    public LookupFilter() {
058                canFilterIndexColorModel = true;
059        }
060
061        /**
062     * Construct a LookupFilter.
063     * @param colormap the color map
064     */
065        public LookupFilter(Colormap colormap) {
066                canFilterIndexColorModel = true;
067                this.colormap = colormap;
068        }
069
070    /**
071     * Set the colormap to be used for the filter.
072     * @param colormap the colormap
073     * @see #getColormap
074     */
075        public void setColormap(Colormap colormap) {
076                this.colormap = colormap;
077        }
078
079    /**
080     * Get the colormap to be used for the filter.
081     * @return the colormap
082     * @see #setColormap
083     */
084        public Colormap getColormap() {
085                return colormap;
086        }
087
088        public int filterRGB(int x, int y, int rgb) {
089//              int a = rgb & 0xff000000;
090                int r = (rgb >> 16) & 0xff;
091                int g = (rgb >> 8) & 0xff;
092                int b = rgb & 0xff;
093                rgb = (r + g + b) / 3;
094                return colormap.getColor(rgb/255.0f);
095        }
096
097        public String toString() {
098                return "Colors/Lookup...";
099        }
100
101        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
102                Object o;
103                if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap"));
104                if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){
105                        int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions");
106                        setDimensions(dim[0],dim[1]);
107                }
108
109                // check for arguments not supported
110                if(parameters.size()>0) {
111                        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 [Colormap, Dimensions]");
112                }
113
114                return filter(src, dst);
115        }
116}
117
118