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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.image;
import java.io.IOException;
import org.apache.xmlgraphics.image.codec.png.PNGRed;
import org.apache.xmlgraphics.image.codec.png.PNGDecodeParam;
import org.apache.xmlgraphics.image.codec.util.SeekableStream;
import org.apache.xmlgraphics.image.rendered.CachableRed;
import org.apache.commons.io.IOUtils;
/**
* FopImage object using PNG
* @author Eric SCHAEFFER
* @see AbstractFopImage
* @see FopImage
*/
public class PNGImage extends XmlGraphicsCommonsImage {
/**
* 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.XmlGraphicsCommonsImage#decodeImage(
* org.apache.xmlgraphics.image.codec.util.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;
}
/**
* Load the original PNG data.
* This loads the original PNG data as is into memory.
*
* @return true if loaded false for any error
*/
protected boolean loadOriginalData() {
try {
seekableInput.seek(0);
this.raw = IOUtils.toByteArray(seekableInput);
} catch (java.io.IOException ex) {
log.error("Error while loading raw image: " + ex.getMessage(), ex);
return false;
} finally {
IOUtils.closeQuietly(inputStream);
inputStream = null;
}
return true;
}
}
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