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.Struct;
043import lucee.runtime.type.util.CollectionUtil;
044
045/**
046 * A filter which replcaes each pixel by the mimimum of itself and its eight neightbours.
047 */
048public class MinimumFilter extends WholeImageFilter  implements DynFiltering {
049        
050        public MinimumFilter() {
051        }
052        
053        protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
054                int index = 0;
055                int[] outPixels = new int[width * height];
056
057                for (int y = 0; y < height; y++) {
058                        for (int x = 0; x < width; x++) {
059                                int pixel = 0xffffffff;
060                                for (int dy = -1; dy <= 1; dy++) {
061                                        int iy = y+dy;
062                                        int ioffset;
063                                        if (0 <= iy && iy < height) {
064                                                ioffset = iy*width;
065                                                for (int dx = -1; dx <= 1; dx++) {
066                                                        int ix = x+dx;
067                                                        if (0 <= ix && ix < width) {
068                                                                pixel = PixelUtils.combinePixels(pixel, inPixels[ioffset+ix], PixelUtils.MIN);
069                                                        }
070                                                }
071                                        }
072                                }
073                                outPixels[index++] = pixel;
074                        }
075                }
076                return outPixels;
077        }
078
079        public String toString() {
080                return "Blur/Minimum";
081        }
082
083        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
084                //Object o;
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 []");
089                }
090
091                return filter(src, dst);
092        }
093}
094