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     * A filter which inverts the RGB channels of an image.
030     */
031    public class InvertFilter extends PointFilter implements DynFiltering {
032    
033            public InvertFilter() {
034                    canFilterIndexColorModel = true;
035            }
036    
037            public int filterRGB(int x, int y, int rgb) {
038                    int a = rgb & 0xff000000;
039                    return a | (~rgb & 0x00ffffff);
040            }
041    
042            public String toString() {
043                    return "Colors/Invert";
044            }
045    
046            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
047                    Object o;
048                    if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){
049                            int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions");
050                            setDimensions(dim[0],dim[1]);
051                    }
052    
053                    // check for arguments not supported
054                    if(parameters.size()>0) {
055                            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 [Dimensions]");
056                    }
057    
058                    return filter(src, dst);
059            }
060    }
061