/*
* 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: PreloaderTIFF.java 607082 2007-12-27 16:21:37Z jeremias $ */
package org.apache.xmlgraphics.image.loader.impl;
import java.io.IOException;
import java.text.MessageFormat;
import javax.imageio.stream.ImageInputStream;
import javax.xml.transform.Source;
import org.apache.xmlgraphics.image.codec.tiff.TIFFDirectory;
import org.apache.xmlgraphics.image.codec.tiff.TIFFField;
import org.apache.xmlgraphics.image.codec.tiff.TIFFImageDecoder;
import org.apache.xmlgraphics.image.codec.util.SeekableStream;
import org.apache.xmlgraphics.image.loader.ImageContext;
import org.apache.xmlgraphics.image.loader.ImageException;
import org.apache.xmlgraphics.image.loader.ImageInfo;
import org.apache.xmlgraphics.image.loader.ImageSize;
import org.apache.xmlgraphics.image.loader.SubImageNotFoundException;
import org.apache.xmlgraphics.image.loader.util.ImageUtil;
import org.apache.xmlgraphics.image.loader.util.SeekableStreamAdapter;
import org.apache.xmlgraphics.util.MimeConstants;
import org.apache.xmlgraphics.util.UnitConv;
/**
* Image preloader for TIFF images.
* <p>
* Note: The implementation relies on the TIFF codec code in Apache XML Graphics Commons for
* access to the TIFF directory.
*/
public class PreloaderTIFF extends AbstractImagePreloader {
private static final int TIFF_SIG_LENGTH = 8;
/** {@inheritDoc}
* @throws ImageException */
public ImageInfo preloadImage(String uri, Source src, ImageContext context)
throws IOException, ImageException {
if (!ImageUtil.hasImageInputStream(src)) {
return null;
}
ImageInputStream in = ImageUtil.needImageInputStream(src);
byte[] header = getHeader(in, TIFF_SIG_LENGTH);
boolean supported = false;
// first 2 bytes = II (little endian encoding)
if (header[0] == (byte) 0x49 && header[1] == (byte) 0x49) {
// look for '42' in byte 3 and '0' in byte 4
if (header[2] == 42 && header[3] == 0) {
supported = true;
}
}
// first 2 bytes == MM (big endian encoding)
if (header[0] == (byte) 0x4D && header[1] == (byte) 0x4D) {
// look for '42' in byte 4 and '0' in byte 3
if (header[2] == 0 && header[3] == 42) {
supported = true;
}
}
if (supported) {
ImageInfo info = createImageInfo(uri, in, context);
return info;
} else {
return null;
}
}
private ImageInfo createImageInfo(String uri, ImageInputStream in, ImageContext context)
throws IOException, ImageException {
ImageInfo info = null;
in.mark();
try {
int pageIndex = ImageUtil.needPageIndexFromURI(uri);
SeekableStream seekable = new SeekableStreamAdapter(in);
TIFFDirectory dir;
try {
dir = new TIFFDirectory(seekable, pageIndex);
} catch (IllegalArgumentException iae) {
String errorMessage = MessageFormat.format(
"Subimage {0} does not exist.", new Object[] {new Integer(pageIndex)});
throw new SubImageNotFoundException(errorMessage);
}
int width = (int)dir.getFieldAsLong(TIFFImageDecoder.TIFF_IMAGE_WIDTH);
int height = (int)dir.getFieldAsLong(TIFFImageDecoder.TIFF_IMAGE_LENGTH);
ImageSize size = new ImageSize();
size.setSizeInPixels(width, height);
int unit = 2; //inch is default
if (dir.isTagPresent(TIFFImageDecoder.TIFF_RESOLUTION_UNIT)) {
unit = (int)dir.getFieldAsLong(TIFFImageDecoder.TIFF_RESOLUTION_UNIT);
}
if (unit == 2 || unit == 3) {
float xRes, yRes;
TIFFField fldx = dir.getField(TIFFImageDecoder.TIFF_X_RESOLUTION);
TIFFField fldy = dir.getField(TIFFImageDecoder.TIFF_Y_RESOLUTION);
if (fldx == null || fldy == null) {
unit = 2;
xRes = context.getSourceResolution();
yRes = xRes;
} else {
xRes = fldx.getAsFloat(0);
yRes = fldy.getAsFloat(0);
}
if (unit == 2) {
size.setResolution(xRes, yRes); //Inch
} else {
size.setResolution(
UnitConv.in2mm(xRes) / 10,
UnitConv.in2mm(yRes) / 10); //Centimeters
}
} else {
size.setResolution(context.getSourceResolution());
}
size.calcSizeFromPixels();
info = new ImageInfo(uri, MimeConstants.MIME_TIFF);
info.setSize(size);
TIFFField fld;
fld = dir.getField(TIFFImageDecoder.TIFF_COMPRESSION);
if (fld != null) {
int compression = fld.getAsInt(0);
info.getCustomObjects().put("TIFF_COMPRESSION", new Integer(compression));
}
fld = dir.getField(TIFFImageDecoder.TIFF_TILE_WIDTH);
if (fld != null) {
info.getCustomObjects().put("TIFF_TILED", Boolean.TRUE);
}
int stripCount;
fld = dir.getField(TIFFImageDecoder.TIFF_ROWS_PER_STRIP);
if (fld == null) {
stripCount = 1;
} else {
stripCount = (int)(size.getHeightPx() / fld.getAsLong(0));
}
info.getCustomObjects().put("TIFF_STRIP_COUNT", new Integer(stripCount));
try {
//Check if there is a next page
new TIFFDirectory(seekable, pageIndex + 1);
info.getCustomObjects().put(ImageInfo.HAS_MORE_IMAGES, Boolean.TRUE);
} catch (IllegalArgumentException iae) {
info.getCustomObjects().put(ImageInfo.HAS_MORE_IMAGES, Boolean.FALSE);
}
} finally {
in.reset();
}
return info;
}
}