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.KeyImpl;
025    import railo.runtime.type.List;
026    import railo.runtime.type.Struct;
027    
028    /**
029     * Given a binary image, this filter converts it to its outline, replacing all interior pixels with the 'new' color.
030     */
031    public class OutlineFilter extends BinaryFilter  implements DynFiltering {
032    
033            public OutlineFilter() {
034                    newColor = 0xffffffff;
035            }
036    
037            protected int[] filterPixels( int width, int height, int[] inPixels, Rectangle transformedSpace ) {
038                    int index = 0;
039                    int[] outPixels = new int[width * height];
040    
041                    for (int y = 0; y < height; y++) {
042                            for (int x = 0; x < width; x++) {
043                                    int pixel = inPixels[y*width+x];
044                                    if (blackFunction.isBlack(pixel)) {
045                                            int neighbours = 0;
046    
047                                            for (int dy = -1; dy <= 1; dy++) {
048                                                    int iy = y+dy;
049                                                    int ioffset;
050                                                    if (0 <= iy && iy < height) {
051                                                            ioffset = iy*width;
052                                                            for (int dx = -1; dx <= 1; dx++) {
053                                                                    int ix = x+dx;
054                                                                    if (!(dy == 0 && dx == 0) && 0 <= ix && ix < width) {
055                                                                            int rgb = inPixels[ioffset+ix];
056                                                                            if (blackFunction.isBlack(rgb))
057                                                                                    neighbours++;
058                                                                    } else
059                                                                            neighbours++;
060                                                            }
061                                                    }
062                                            }
063                                            
064                                            if (neighbours == 9)
065                                                    pixel = newColor;
066                                    }
067                                    outPixels[index++] = pixel;
068                            }
069    
070                    }
071                    return outPixels;
072            }
073    
074            public String toString() {
075                    return "Binary/Outline...";
076            }
077    
078            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
079                    Object o;
080                    if((o=parameters.removeEL(KeyImpl.init("Iterations")))!=null)setIterations(ImageFilterUtil.toIntValue(o,"Iterations"));
081                    if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap"));
082                    if((o=parameters.removeEL(KeyImpl.init("NewColor")))!=null)setNewColor(ImageFilterUtil.toColorRGB(o,"NewColor"));
083                    
084                    // check for arguments not supported
085                    if(parameters.size()>0) {
086                            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 [Iterations, Colormap, NewColor, BlackFunction]");
087                    }
088    
089                    return filter(src, dst);
090            }
091    }
092