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.List;
025    import railo.runtime.type.Struct;
026    
027    
028    
029    /**
030     * A filter which performs a simple 3x3 sharpening operation.
031     */
032    public class SharpenFilter extends ConvolveFilter  implements DynFiltering {
033            
034            private static float[] sharpenMatrix = {
035                     0.0f, -0.2f,  0.0f,
036                    -0.2f,  1.8f, -0.2f,
037                     0.0f, -0.2f,  0.0f
038            };
039    
040            public SharpenFilter() {
041                    super(sharpenMatrix);
042            }
043    
044            public String toString() {
045                    return "Blur/Sharpen";
046            }
047            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
048                    Object o;
049                    if((o=parameters.removeEL(KeyImpl.init("EdgeAction")))!=null)setEdgeAction(ImageFilterUtil.toString(o,"EdgeAction"));
050                    if((o=parameters.removeEL(KeyImpl.init("UseAlpha")))!=null)setUseAlpha(ImageFilterUtil.toBooleanValue(o,"UseAlpha"));
051                    if((o=parameters.removeEL(KeyImpl.init("PremultiplyAlpha")))!=null)setPremultiplyAlpha(ImageFilterUtil.toBooleanValue(o,"PremultiplyAlpha"));
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":"")+" ["+List.arrayToList(parameters.keysAsString(),", ")+"] "+(parameters.size()>1?"are":"is")+" not allowed, only the following parameters are supported [Kernel, EdgeAction, UseAlpha, PremultiplyAlpha]");
056                    }
057    
058                    return filter(src, dst);
059            }
060    }