001    /*
002    *
003    
004    Licensed under the Apache License, Version 2.0 (the "License");
005    you may not use this file except in compliance with the License.
006    You may obtain a copy of the License at
007    
008       http://www.apache.org/licenses/LICENSE-2.0
009    
010    Unless required by applicable law or agreed to in writing, software
011    distributed under the License is distributed on an "AS IS" BASIS,
012    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013    See the License for the specific language governing permissions and
014    limitations under the License.
015    */
016    
017    package railo.runtime.img.filter;import java.awt.Rectangle;
018    import java.awt.image.BufferedImage;
019    
020    import railo.runtime.engine.ThreadLocalPageContext;
021    import railo.runtime.exp.FunctionException;
022    import railo.runtime.exp.PageException;
023    import railo.runtime.img.ImageUtil;
024    import railo.runtime.type.List;
025    import railo.runtime.type.Struct;
026    
027    /**
028     * A filter which performs reduces noise by looking at each pixel's 8 neighbours, and if it's a minimum or maximum,
029     * replacing it by the next minimum or maximum of the neighbours.
030     */
031    public class ReduceNoiseFilter extends WholeImageFilter  implements DynFiltering {
032    
033            public ReduceNoiseFilter() {
034            }
035    
036            private int smooth(int[] v) {
037                    int minindex = 0, maxindex = 0, min = Integer.MAX_VALUE, max = Integer.MIN_VALUE;
038                    
039                    for (int i = 0; i < 9; i++) {
040                            if ( i != 4 ) {
041                                    if (v[i] < min) {
042                                            min = v[i];
043                                            minindex = i;
044                                    }
045                                    if (v[i] > max) {
046                                            max = v[i];
047                                            maxindex = i;
048                                    }
049                            }
050                    }
051                    if ( v[4] < min )
052                            return v[minindex];
053                    if ( v[4] > max )
054                            return v[maxindex];
055                    return v[4];
056            }
057    
058            protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
059                    int index = 0;
060                    int[] r = new int[9];
061                    int[] g = new int[9];
062                    int[] b = new int[9];
063                    int[] outPixels = new int[width * height];
064    
065                    for (int y = 0; y < height; y++) {
066                            for (int x = 0; x < width; x++) {
067                                    int k = 0;
068                                    int irgb = inPixels[index];
069                                    int ir = (irgb >> 16) & 0xff;
070                                    int ig = (irgb >> 8) & 0xff;
071                                    int ib = irgb & 0xff;
072                                    for (int dy = -1; dy <= 1; dy++) {
073                                            int iy = y+dy;
074                                            if (0 <= iy && iy < height) {
075                                                    int ioffset = iy*width;
076                                                    for (int dx = -1; dx <= 1; dx++) {
077                                                            int ix = x+dx;
078                                                            if (0 <= ix && ix < width) {
079                                                                    int rgb = inPixels[ioffset+ix];
080                                                                    r[k] = (rgb >> 16) & 0xff;
081                                                                    g[k] = (rgb >> 8) & 0xff;
082                                                                    b[k] = rgb & 0xff;
083                                                            } else {
084                                                                    r[k] = ir;
085                                                                    g[k] = ig;
086                                                                    b[k] = ib;
087                                                            }
088                                                            k++;
089                                                    }
090                                            } else {
091                                                    for (int dx = -1; dx <= 1; dx++) {
092                                                            r[k] = ir;
093                                                            g[k] = ig;
094                                                            b[k] = ib;
095                                                            k++;
096                                                    }
097                                            }
098                                    }
099                                    outPixels[index] = (inPixels[index] & 0xff000000) | (smooth(r) << 16) | (smooth(g) << 8) | smooth(b);
100                                    index++;
101                            }
102                    }
103                    return outPixels;
104            }
105    
106            public String toString() {
107                    return "Blur/Smooth";
108            }
109    
110            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
111                    Object o;
112    
113                    // check for arguments not supported
114                    if(parameters.size()>0) {
115                            throw new FunctionException(ThreadLocalPageContext.get(), "ImageFilter", 3, "parameters", "the parameter"+(parameters.size()>1?"s":"")+" ["+List.arrayToList(parameters.keysAsString(),", ")+"] "+(parameters.size()>1?"are":"is")+" not allowed, only the following parameters are supported []");
116                    }
117    
118                    return filter(src, dst);
119            }
120    }
121