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 solarizes an image.
031     */
032    public class SolarizeFilter extends TransferFilter  implements DynFiltering {
033    
034            protected float transferFunction( float v ) {
035                    return v > 0.5f ? 2*(v-0.5f) : 2*(0.5f-v);
036            }
037    
038            public String toString() {
039                    return "Colors/Solarize";
040            }
041            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
042                    Object o;
043                    if((o=parameters.removeEL(KeyImpl.init("Dimensions")))!=null){
044                            int[] dim=ImageFilterUtil.toDimensions(o,"Dimensions");
045                            setDimensions(dim[0],dim[1]);
046                    }
047    
048                    // check for arguments not supported
049                    if(parameters.size()>0) {
050                            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 [Dimensions]");
051                    }
052    
053                    return filter(src, dst);
054            }
055    }
056