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 performs reduces noise by looking at each pixel's 8 neighbours, and if it's a minimum or maximum,
047 * replacing it by the next minimum or maximum of the neighbours.
048 */
049public class ReduceNoiseFilter extends WholeImageFilter  implements DynFiltering {
050
051        public ReduceNoiseFilter() {
052        }
053
054        private int smooth(int[] v) {
055                int minindex = 0, maxindex = 0, min = Integer.MAX_VALUE, max = Integer.MIN_VALUE;
056                
057                for (int i = 0; i < 9; i++) {
058                        if ( i != 4 ) {
059                                if (v[i] < min) {
060                                        min = v[i];
061                                        minindex = i;
062                                }
063                                if (v[i] > max) {
064                                        max = v[i];
065                                        maxindex = i;
066                                }
067                        }
068                }
069                if ( v[4] < min )
070                        return v[minindex];
071                if ( v[4] > max )
072                        return v[maxindex];
073                return v[4];
074        }
075
076        protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
077                int index = 0;
078                int[] r = new int[9];
079                int[] g = new int[9];
080                int[] b = new int[9];
081                int[] outPixels = new int[width * height];
082
083                for (int y = 0; y < height; y++) {
084                        for (int x = 0; x < width; x++) {
085                                int k = 0;
086                                int irgb = inPixels[index];
087                                int ir = (irgb >> 16) & 0xff;
088                                int ig = (irgb >> 8) & 0xff;
089                                int ib = irgb & 0xff;
090                                for (int dy = -1; dy <= 1; dy++) {
091                                        int iy = y+dy;
092                                        if (0 <= iy && iy < height) {
093                                                int ioffset = iy*width;
094                                                for (int dx = -1; dx <= 1; dx++) {
095                                                        int ix = x+dx;
096                                                        if (0 <= ix && ix < width) {
097                                                                int rgb = inPixels[ioffset+ix];
098                                                                r[k] = (rgb >> 16) & 0xff;
099                                                                g[k] = (rgb >> 8) & 0xff;
100                                                                b[k] = rgb & 0xff;
101                                                        } else {
102                                                                r[k] = ir;
103                                                                g[k] = ig;
104                                                                b[k] = ib;
105                                                        }
106                                                        k++;
107                                                }
108                                        } else {
109                                                for (int dx = -1; dx <= 1; dx++) {
110                                                        r[k] = ir;
111                                                        g[k] = ig;
112                                                        b[k] = ib;
113                                                        k++;
114                                                }
115                                        }
116                                }
117                                outPixels[index] = (inPixels[index] & 0xff000000) | (smooth(r) << 16) | (smooth(g) << 8) | smooth(b);
118                                index++;
119                        }
120                }
121                return outPixels;
122        }
123
124        public String toString() {
125                return "Blur/Smooth";
126        }
127
128        public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
129                //Object o;
130
131                // check for arguments not supported
132                if(parameters.size()>0) {
133                        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 []");
134                }
135
136                return filter(src, dst);
137        }
138}
139