/*
* 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" );
}
}