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 converts it to its outline, replacing all interior pixels with the 'new' color.
048 */
049public class OutlineFilter extends BinaryFilter  implements DynFiltering {
050
051        public OutlineFilter() {
052                newColor = 0xffffffff;
053        }
054
055        protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
056                int index = 0;
057                int[] outPixels = new int[width * height];
058
059                for (int y = 0; y < height; y++) {
060                        for (int x = 0; x < width; x++) {
061                                int pixel = inPixels[y*width+x];
062                                if (blackFunction.isBlack(pixel)) {
063                                        int neighbours = 0;
064
065                                        for (int dy = -1; dy <= 1; dy++) {
066                                                int iy = y+dy;
067                                                int ioffset;
068                                                if (0 <= iy && iy < height) {
069                                                        ioffset = iy*width;
070                                                        for (int dx = -1; dx <= 1; dx++) {
071                                                                int ix = x+dx;
072                                                                if (!(dy == 0 && dx == 0) && 0 <= ix && ix < width) {
073                                                                        int rgb = inPixels[ioffset+ix];
074                                                                        if (blackFunction.isBlack(rgb))
075                                                                                neighbours++;
076                                                                } else
077                                                                        neighbours++;
078                                                        }
079                                                }
080                                        }
081                                        
082                                        if (neighbours == 9)
083                                                pixel = newColor;
084                                }
085                                outPixels[index++] = pixel;
086                        }
087
088                }
089                return outPixels;
090        }
091
092        public String toString() {
093                return "Binary/Outline...";
094        }
095
096        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
097                Object o;
098                if((o=parameters.removeEL(KeyImpl.init("Iterations")))!=null)setIterations(ImageFilterUtil.toIntValue(o,"Iterations"));
099                if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap"));
100                if((o=parameters.removeEL(KeyImpl.init("NewColor")))!=null)setNewColor(ImageFilterUtil.toColorRGB(o,"NewColor"));
101                
102                // check for arguments not supported
103                if(parameters.size()>0) {
104                        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 [Iterations, Colormap, NewColor, BlackFunction]");
105                }
106
107                return filter(src, dst);
108        }
109}
110