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.image.BufferedImage;
018    
019    import railo.runtime.engine.ThreadLocalPageContext;
020    import railo.runtime.exp.FunctionException;
021    import railo.runtime.exp.PageException;
022    import railo.runtime.img.ImageUtil;
023    import railo.runtime.type.KeyImpl;
024    import railo.runtime.type.Struct;
025    import railo.runtime.type.util.CollectionUtil;
026    
027    
028    
029    /**
030     * A filter which uses the brightness of each pixel to lookup a color from a colormap. 
031     */
032    public class LookupFilter extends PointFilter  implements DynFiltering {
033            
034            private Colormap colormap = new Gradient();
035            
036            /**
037         * Construct a LookupFilter.
038         */
039        public LookupFilter() {
040                    canFilterIndexColorModel = true;
041            }
042    
043            /**
044         * Construct a LookupFilter.
045         * @param colormap the color map
046         */
047            public LookupFilter(Colormap colormap) {
048                    canFilterIndexColorModel = true;
049                    this.colormap = colormap;
050            }
051    
052        /**
053         * Set the colormap to be used for the filter.
054         * @param colormap the colormap
055         * @see #getColormap
056         */
057            public void setColormap(Colormap colormap) {
058                    this.colormap = colormap;
059            }
060    
061        /**
062         * Get the colormap to be used for the filter.
063         * @return the colormap
064         * @see #setColormap
065         */
066            public Colormap getColormap() {
067                    return colormap;
068            }
069    
070            public int filterRGB(int x, int y, int rgb) {
071    //              int a = rgb & 0xff000000;
072                    int r = (rgb >> 16) & 0xff;
073                    int g = (rgb >> 8) & 0xff;
074                    int b = rgb & 0xff;
075                    rgb = (r + g + b) / 3;
076                    return colormap.getColor(rgb/255.0f);
077            }
078    
079            public String toString() {
080                    return "Colors/Lookup...";
081            }
082    
083            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
084                    Object o;
085                    if((o=parameters.removeEL(KeyImpl.init("Colormap")))!=null)setColormap(ImageFilterUtil.toColormap(o,"Colormap"));
086                    if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){
087                            int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions");
088                            setDimensions(dim[0],dim[1]);
089                    }
090    
091                    // check for arguments not supported
092                    if(parameters.size()>0) {
093                            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 [Colormap, Dimensions]");
094                    }
095    
096                    return filter(src, dst);
097            }
098    }
099    
100