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.Rectangle;
036import java.awt.image.BufferedImage;
037
038import lucee.runtime.engine.ThreadLocalPageContext;
039import lucee.runtime.exp.FunctionException;
040import lucee.runtime.exp.PageException;
041import lucee.runtime.img.ImageUtil;
042import lucee.runtime.type.KeyImpl;
043import lucee.runtime.type.Struct;
044import lucee.runtime.type.util.CollectionUtil;
045
046/**
047 * Given a binary image, this filter performs binary dilation, setting all added pixels to the given 'new' color.
048 */
049public class DilateFilter extends BinaryFilter  implements DynFiltering {
050
051        private int threshold = 2;
052
053        public DilateFilter() {
054        }
055
056        /**
057         * Set the threshold - the number of neighbouring pixels for dilation to occur.
058         * @param threshold the new threshold
059     * @see #getThreshold
060         */
061        public void setThreshold(int threshold) {
062                this.threshold = threshold;
063        }
064        
065        /**
066         * Return the threshold - the number of neighbouring pixels for dilation to occur.
067         * @return the current threshold
068     * @see #setThreshold
069         */
070        public int getThreshold() {
071                return threshold;
072        }
073        
074        protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
075                int[] outPixels = new int[width * height];
076
077                for (int i = 0; i < iterations; i++) {
078                        int index = 0;
079
080                        if (i > 0) {
081                                int[] t = inPixels;
082                                inPixels = outPixels;
083                                outPixels = t;
084                        }
085                        for (int y = 0; y < height; y++) {
086                                for (int x = 0; x < width; x++) {
087                                        int pixel = inPixels[y*width+x];
088                                        if (!blackFunction.isBlack(pixel)) {
089                                                int neighbours = 0;
090
091                                                for (int dy = -1; dy <= 1; dy++) {
092                                                        int iy = y+dy;
093                                                        int ioffset;
094                                                        if (0 <= iy && iy < height) {
095                                                                ioffset = iy*width;
096                                                                for (int dx = -1; dx <= 1; dx++) {
097                                                                        int ix = x+dx;
098                                                                        if (!(dy == 0 && dx == 0) && 0 <= ix && ix < width) {
099                                                                                int rgb = inPixels[ioffset+ix];
100                                                                                if (blackFunction.isBlack(rgb))
101                                                                                        neighbours++;
102                                                                        }
103                                                                }
104                                                        }
105                                                }
106                                                
107                                                if (neighbours >= threshold) {
108                                                        if (colormap != null)
109                                                                pixel = colormap.getColor((float)i/iterations);
110                                                        else
111                                                                pixel = newColor;
112                                                }
113                                        }
114                                        outPixels[index++] = pixel;
115                                }
116                        }
117                }
118                return outPixels;
119        }
120
121        public String toString() {
122                return "Binary/Dilate...";
123        }
124
125        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
126                Object o;
127                if((o=parameters.removeEL(KeyImpl.init("Threshold")))!=null)setThreshold(ImageFilterUtil.toIntValue(o,"Threshold"));
128                if((o=parameters.removeEL(KeyImpl.init("Iterations")))!=null)setIterations(ImageFilterUtil.toIntValue(o,"Iterations"));
129                if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap"));
130                if((o=parameters.removeEL(KeyImpl.init("NewColor")))!=null)setNewColor(ImageFilterUtil.toColorRGB(o,"NewColor"));
131                
132                // check for arguments not supported
133                if(parameters.size()>0) {
134                        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 [Threshold, Iterations, Colormap, NewColor, BlackFunction]");
135                }
136
137                return filter(src, dst);
138        }
139}
140