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 }