/*
* Copyright 2004-2005 The Apache Software Foundation
*
* Licensed 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.
*/
/* $Id: PNGImage.java 234261 2005-08-21 16:44:00Z jeremias $ */
package org.apache.fop.image;
import java.io.IOException;
import org.apache.batik.ext.awt.image.codec.PNGRed;
import org.apache.batik.ext.awt.image.codec.PNGDecodeParam;
import org.apache.batik.ext.awt.image.codec.SeekableStream;
import org.apache.batik.ext.awt.image.rendered.CachableRed;
/**
* FopImage object using PNG
* @author Eric SCHAEFFER
* @see AbstractFopImage
* @see FopImage
*/
public class PNGImage extends BatikImage {
/**
* Constructs a new PNGImage instance.
* @param imgReader basic metadata for the image
*/
public PNGImage(FopImage.ImageInfo imgReader) {
super(imgReader);
this.loaded = 0; //TODO The PNGReader cannot read the resolution, yet.
}
/**
* @see org.apache.fop.image.BatikImage#decodeImage(org.apache.batik.ext.awt.image.codec.SeekableStream)
*/
protected CachableRed decodeImage(SeekableStream stream) throws IOException {
PNGDecodeParam param = new PNGDecodeParam();
param.setPerformGammaCorrection(true);
param.setDisplayExponent(2.2f); // sRGB gamma
PNGRed red = new PNGRed(stream, param);
String unit = (String)red.getProperty("pixel_units");
if ("Meters".equals(unit)) {
this.dpiHorizontal = ((Integer)red.getProperty("x_pixels_per_unit")).intValue()
* 25.4f / 1000f;
this.dpiVertical = ((Integer)red.getProperty("y_pixels_per_unit")).intValue()
* 25.4f / 1000f;
}
return red;
}
}