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/*
* 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.
*/
/* $Id$ */
package org.apache.fop.image;
import java.awt.color.ColorSpace;
import java.io.IOException;
import org.apache.batik.ext.awt.image.codec.SeekableStream;
import org.apache.batik.ext.awt.image.codec.tiff.TIFFDirectory;
import org.apache.batik.ext.awt.image.codec.tiff.TIFFField;
import org.apache.batik.ext.awt.image.codec.tiff.TIFFImageDecoder;
import org.apache.batik.ext.awt.image.rendered.CachableRed;
import org.apache.commons.io.IOUtils;
/**
* TIFF implementation using the Batik codecs.
*/
public class TIFFImage extends BatikImage {
private int compression = 0;
private int stripCount = 0;
private long stripOffset = 0;
private long stripLength = 0;
/**
* Constructs a new BatikImage instance.
* @param imgReader basic metadata for the image
*/
public TIFFImage(FopImage.ImageInfo imgReader) {
super(imgReader);
}
/**
* The compression type set in the TIFF directory
* @return the TIFF compression type
*/
public int getCompression() {
return compression;
}
/**
* The number of strips in the image
* @return the number of strips in the image
*/
public int getStripCount() {
return stripCount;
}
/** @see org.apache.fop.image.BatikImage */
protected CachableRed decodeImage(SeekableStream stream) throws IOException {
org.apache.batik.ext.awt.image.codec.tiff.TIFFImage img
= new org.apache.batik.ext.awt.image.codec.tiff.TIFFImage
(stream, null, 0);
TIFFDirectory dir = (TIFFDirectory)img.getProperty("tiff_directory");
TIFFField fld = dir.getField(TIFFImageDecoder.TIFF_RESOLUTION_UNIT);
int resUnit = fld.getAsInt(0);
fld = dir.getField(TIFFImageDecoder.TIFF_X_RESOLUTION);
double xRes = fld.getAsDouble(0);
fld = dir.getField(TIFFImageDecoder.TIFF_Y_RESOLUTION);
double yRes = fld.getAsDouble(0);
switch (resUnit) {
case 2: //inch
this.dpiHorizontal = xRes;
this.dpiVertical = yRes;
break;
case 3: //cm
this.dpiHorizontal = xRes * 2.54f;
this.dpiVertical = yRes * 2.54f;
break;
default:
//ignored
log.warn("Cannot determine bitmap resolution."
+ " Unimplemented resolution unit: " + resUnit);
}
fld = dir.getField(TIFFImageDecoder.TIFF_COMPRESSION);
if (fld != null) {
compression = fld.getAsInt(0);
}
fld = dir.getField(TIFFImageDecoder.TIFF_BITS_PER_SAMPLE);
if (fld != null) {
bitsPerPixel = fld.getAsInt(0);
}
fld = dir.getField(TIFFImageDecoder.TIFF_ROWS_PER_STRIP);
if (fld == null) {
stripCount = 1;
} else {
stripCount = (int)(dir.getFieldAsLong(TIFFImageDecoder.TIFF_IMAGE_LENGTH)
/ fld.getAsLong(0));
}
stripOffset = dir.getField(TIFFImageDecoder.TIFF_STRIP_OFFSETS).getAsLong(0);
stripLength = dir.getField(TIFFImageDecoder.TIFF_STRIP_BYTE_COUNTS).getAsLong(0);
if (this.bitsPerPixel == 1) {
this.colorSpace = ColorSpace.getInstance(ColorSpace.CS_GRAY);
}
return img;
}
/**
* Load the original TIFF data.
* This loads only strip 1 of the original TIFF data.
*
* @return true if loaded false for any error
* @see org.apache.fop.image.AbstractFopImage#loadOriginalData()
*/
protected boolean loadOriginalData() {
if (loadDimensions()) {
byte[] readBuf = new byte[(int)stripLength];
int bytesRead;
try {
this.seekableInput.reset();
this.seekableInput.skip(stripOffset);
bytesRead = seekableInput.read(readBuf);
if (bytesRead != stripLength) {
log.error("Error while loading image: length mismatch on read");
return false;
}
this.raw = readBuf;
return true;
} catch (IOException ioe) {
log.error("Error while loading image strip 1 (TIFF): ", ioe);
return false;
} finally {
IOUtils.closeQuietly(seekableInput);
IOUtils.closeQuietly(inputStream);
this.seekableInput = null;
this.inputStream = null;
this.cr = null;
}
}
return false;
}
}
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