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 simple blur filter. You should probably use BoxBlurFilter instead.
030     */
031    public class BlurFilter extends ConvolveFilter  implements DynFiltering {
032            
033            /**
034         * A 3x3 convolution kernel for a simple blur.
035         */
036        protected static float[] blurMatrix = {
037                    1/14f, 2/14f, 1/14f,
038                    2/14f, 2/14f, 2/14f,
039                    1/14f, 2/14f, 1/14f
040            };
041    
042            public BlurFilter() {
043                    super( blurMatrix );
044            }
045    
046            public String toString() {
047                    return "Blur/Simple Blur";
048            }
049            public BufferedImage filter(BufferedImage src, Struct parameters) throws PageException {BufferedImage dst=ImageUtil.createBufferedImage(src);
050                    Object o;
051                    if((o=parameters.removeEL(KeyImpl.init("EdgeAction")))!=null)setEdgeAction(ImageFilterUtil.toString(o,"EdgeAction"));
052                    if((o=parameters.removeEL(KeyImpl.init("UseAlpha")))!=null)setUseAlpha(ImageFilterUtil.toBooleanValue(o,"UseAlpha"));
053                    if((o=parameters.removeEL(KeyImpl.init("PremultiplyAlpha")))!=null)setPremultiplyAlpha(ImageFilterUtil.toBooleanValue(o,"PremultiplyAlpha"));
054    
055                    // check for arguments not supported
056                    if(parameters.size()>0) {
057                            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 [Kernel, EdgeAction, UseAlpha, PremultiplyAlpha]");
058                    }
059    
060                    return filter(src, dst);
061            }
062    }