| /* |
| * 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.geom.AffineTransform; |
| import java.awt.image.AffineTransformOp; |
| import java.awt.image.WritableRaster; |
| import org.apache.avalon.framework.parameters.Parameters; |
| import org.apache.cocoon.ProcessingException; |
| |
| public class ResizeOperation |
| implements ImageOperation { |
| |
| private String prefix; |
| private boolean enabled; |
| private int height; |
| private int width; |
| private boolean preserveRatio; |
| private boolean adjustX; |
| private boolean allowEnlarge; |
| |
| public void setPrefix( String prefix ) { |
| this.prefix = prefix; |
| } |
| |
| public void setup( Parameters params ) |
| throws ProcessingException { |
| enabled = params.getParameterAsBoolean( prefix + "enabled", true); |
| height = params.getParameterAsInteger( prefix + "height", 0 ); |
| if( height < 0 ) { |
| throw new ProcessingException( "Negative Height is not allowed: " + height ); |
| } |
| width = params.getParameterAsInteger( prefix + "width", 0 ); |
| if( width < 0 ) { |
| throw new ProcessingException( "Negative Width is not allowed: " + width ); |
| } |
| preserveRatio = params.getParameterAsBoolean( prefix + "preserve-ratio", false ); |
| adjustX = params.getParameterAsBoolean( prefix + "adjust-x", false ); |
| allowEnlarge = params.getParameterAsBoolean( prefix + "allow-enlarge", true ); |
| } |
| |
| public WritableRaster apply( WritableRaster image ) { |
| if( ! enabled ) { |
| return image; |
| } |
| |
| // If parameter width or height is zero, use the original image size. |
| // Therefore, if both are zero, the image is returned unchanged. |
| |
| if ( width == 0 && height == 0 ) { |
| return image; |
| } |
| |
| double xScale = width == 0 ? 1 : width / (double) image.getWidth(); |
| double yScale = height == 0 ? 1 : height / (double) image.getHeight(); |
| |
| if (allowEnlarge || (xScale <= 1 && yScale <= 1)) |
| { |
| if( preserveRatio ) |
| { |
| if (allowEnlarge) { |
| if (xScale >= 1) { |
| yScale = xScale; |
| } else if (yScale >= 1) { |
| xScale = yScale; |
| } |
| } else { |
| if (xScale <= 1) { |
| yScale = xScale; |
| } else if (yScale <= 1) { |
| xScale = yScale; |
| } |
| } |
| if( adjustX ) |
| xScale = yScale; |
| else |
| yScale = xScale; |
| } |
| |
| AffineTransform scale = AffineTransform.getScaleInstance( xScale, yScale ); |
| AffineTransformOp op = new AffineTransformOp( scale, AffineTransformOp.TYPE_BILINEAR ); |
| WritableRaster scaledRaster = op.filter( image, null ); |
| return scaledRaster; |
| } else { |
| return image; |
| } |
| } |
| |
| public String getKey() { |
| return "resize:" |
| + ( enabled ? "enable" : "disable" ) |
| + ":" + width |
| + ":" + height |
| + ":" + prefix |
| + ":" + ( allowEnlarge ? "allowEnlarge" : "disallowEnlarge" ); |
| } |
| } |