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 * A filter which performs one round of the game of Life on an image.
048 */
049public class LifeFilter extends BinaryFilter  implements DynFiltering {
050
051        public LifeFilter() {
052        }
053
054        protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
055                int index = 0;
056                int[] outPixels = new int[width * height];
057
058                for (int y = 0; y < height; y++) {
059                        for (int x = 0; x < width; x++) {
060                                //int r = 0, g = 0, b = 0;
061                                int pixel = inPixels[y*width+x];
062                                //int a = pixel & 0xff000000;
063                                int neighbours = 0;
064
065                                for (int row = -1; row <= 1; row++) {
066                                        int iy = y+row;
067                                        int ioffset;
068                                        if (0 <= iy && iy < height) {
069                                                ioffset = iy*width;
070                                                for (int col = -1; col <= 1; col++) {
071                                                        int ix = x+col;
072                                                        if (!(row == 0 && col == 0) && 0 <= ix && ix < width) {
073                                                                int rgb = inPixels[ioffset+ix];
074                                                                if (blackFunction.isBlack(rgb))
075                                                                        neighbours++;
076                                                        }
077                                                }
078                                        }
079                                }
080                                
081                                if (blackFunction.isBlack(pixel))
082                                        outPixels[index++] = (neighbours == 2 || neighbours == 3) ? pixel : 0xffffffff;
083                                else
084                                        outPixels[index++] = neighbours == 3 ? 0xff000000 : pixel;
085                        }
086
087                }
088                return outPixels;
089        }
090
091        public String toString() {
092                return "Binary/Life";
093        }
094
095        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
096                Object o;
097                if((o=parameters.removeEL(KeyImpl.init("Iterations")))!=null)setIterations(ImageFilterUtil.toIntValue(o,"Iterations"));
098                if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap"));
099                if((o=parameters.removeEL(KeyImpl.init("NewColor")))!=null)setNewColor(ImageFilterUtil.toColorRGB(o,"NewColor"));
100                
101                // check for arguments not supported
102                if(parameters.size()>0) {
103                        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]");
104                }
105
106                return filter(src, dst);
107        }
108}
109