| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| package org.apache.cocoon.reading.imageop; |
| |
| import java.awt.image.ConvolveOp; |
| import java.awt.image.Kernel; |
| import java.awt.image.WritableRaster; |
| import java.util.StringTokenizer; |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.cocoon.ProcessingException; |
| |
| public class ConvolveOperation |
| implements ImageOperation { |
| |
| private String prefix; |
| private boolean enabled; |
| private int convolveHeight; |
| private int convolveWidth; |
| private float[] data; |
| |
| public void setPrefix( String prefix ) { |
| this.prefix = prefix; |
| } |
| |
| public void setup( Parameters params ) |
| throws ProcessingException { |
| enabled = params.getParameterAsBoolean( prefix + "enabled", true); |
| convolveWidth = params.getParameterAsInteger( prefix + "width", 3 ); |
| convolveHeight = params.getParameterAsInteger( prefix + "height", 3 ); |
| String values = params.getParameter( prefix + "data", "" ); |
| data = getFloatArray( values ); |
| if( data.length != convolveWidth * convolveHeight ) { |
| throw new ProcessingException( "The width*height must be equal to the number of data elements given: " + (convolveWidth * convolveHeight) + " is not compatible with '" + values + "'" ); |
| } |
| } |
| |
| public WritableRaster apply( WritableRaster image ) { |
| if( ! enabled ) { |
| return image; |
| } |
| Kernel kernel = new Kernel( convolveWidth, convolveHeight, data ); |
| ConvolveOp op = new ConvolveOp( kernel, ConvolveOp.EDGE_NO_OP, null ); |
| WritableRaster r = op.filter( image, null ); |
| return r; |
| } |
| |
| private float[] getFloatArray( String values ) { |
| float[] fvalues = new float[ 30 ]; |
| int counter = 0; |
| StringTokenizer st = new StringTokenizer( values, ",", false ); |
| for( int i = 0 ; st.hasMoreTokens() ; i++ ) { |
| String value = st.nextToken().trim(); |
| fvalues[ i ] = Float.parseFloat( value ); |
| counter = counter + 1; |
| } |
| float[] result = new float[ counter ]; |
| for( int i = 0 ; i < counter ; i++ ) { |
| result[i] = fvalues[i]; |
| } |
| return result; |
| } |
| |
| private String getDataAsString() { |
| StringBuffer b = new StringBuffer(); |
| for( int i = 0 ; i < data.length ; i++ ) { |
| if( i != 0 ) { |
| b.append( "," ); |
| } |
| b.append( data[ i ] ); |
| } |
| String result = b.toString(); |
| b.setLength( 0 ); |
| return result; |
| } |
| |
| public String getKey() { |
| return "convolve:" |
| + ( enabled ? "enable" : "disable" ) |
| + ":" + convolveWidth |
| + ":" + convolveHeight |
| + ":" + getDataAsString() |
| + ":" + prefix; |
| } |
| } |
| |