/*
* #%L
* OME Bio-Formats package for reading and converting biological file formats.
* %%
* Copyright (C) 2005 - 2015 Open Microscopy Environment:
* - Board of Regents of the University of Wisconsin-Madison
* - Glencoe Software, Inc.
* - University of Dundee
* %%
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as
* published by the Free Software Foundation, either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public
* License along with this program. If not, see
* <http://www.gnu.org/licenses/gpl-2.0.html>.
* #L%
*/
package loci.formats.in;
import java.io.IOException;
import loci.common.RandomAccessInputStream;
import loci.formats.CoreMetadata;
import loci.formats.FormatException;
import loci.formats.FormatReader;
import loci.formats.FormatTools;
import loci.formats.MetadataTools;
import loci.formats.meta.MetadataStore;
/**
* FEIReader is the file format reader for FEI and Philips .img files.
*/
public class FEIReader extends FormatReader {
// -- Constants --
public static final String FEI_MAGIC_STRING = "XL";
private static final int INVALID_PIXELS = 112;
// -- Fields --
private int headerSize;
// -- Constructor --
/** Constructs a new FEI reader. */
public FEIReader() {
super("FEI/Philips", "img");
suffixSufficient = false;
domains = new String[] {FormatTools.SEM_DOMAIN};
}
// -- IFormatReader API methods --
/* @see loci.formats.IFormatReader#isThisType(RandomAccessInputStream) */
@Override
public boolean isThisType(RandomAccessInputStream stream) throws IOException {
final int blockLen = 2;
if (!FormatTools.validStream(stream, blockLen, false)) return false;
return stream.readString(blockLen).startsWith(FEI_MAGIC_STRING);
}
/**
* @see loci.formats.IFormatReader#openBytes(int, byte[], int, int, int, int)
*/
@Override
public byte[] openBytes(int no, byte[] buf, int x, int y, int w, int h)
throws FormatException, IOException
{
FormatTools.checkPlaneParameters(this, no, buf.length, x, y, w, h);
in.seek(headerSize);
byte[] segment = new byte[getSizeX() / 2];
byte[] plane = new byte[FormatTools.getPlaneSize(this)];
// interlace frames - there are four rows of two columns
int halfRow = getSizeX() / 2;
for (int q=0; q<4; q++) {
for (int row=q; row<getSizeY(); row+=4) {
for (int s=0; s<2; s++) {
in.read(segment);
in.skipBytes(INVALID_PIXELS / 2);
for (int col=s; col<getSizeX(); col+=2) {
plane[row*getSizeX() + col] = segment[col / 2];
}
}
}
}
RandomAccessInputStream pixels = new RandomAccessInputStream(plane);
readPlane(pixels, x, y, w, h, buf);
pixels.close();
return buf;
}
/* @see loci.formats.IFormatReader#close(boolean) */
@Override
public void close(boolean fileOnly) throws IOException {
super.close(fileOnly);
if (!fileOnly) {
headerSize = 0;
}
}
// -- Internal FormatReader API methods --
/* @see loci.formats.FormatReader#initFile(String) */
@Override
protected void initFile(String id) throws FormatException, IOException {
super.initFile(id);
in = new RandomAccessInputStream(id);
in.order(true);
CoreMetadata m = core.get(0);
LOGGER.info("Reading file header");
if (getMetadataOptions().getMetadataLevel() != MetadataLevel.MINIMUM) {
in.skipBytes(44);
float magnification = in.readFloat();
float kV = in.readFloat() / 1000;
float wd = in.readFloat();
in.skipBytes(12);
float spot = in.readFloat();
addGlobalMeta("Magnification", magnification);
addGlobalMeta("kV", kV);
addGlobalMeta("Working distance", wd);
addGlobalMeta("Spot", spot);
}
in.seek(514);
m.sizeX = in.readShort() - INVALID_PIXELS;
m.sizeY = in.readShort();
in.skipBytes(4);
headerSize = in.readShort();
// always one grayscale plane per file
m.sizeZ = 1;
m.sizeC = 1;
m.sizeT = 1;
m.imageCount = 1;
m.littleEndian = true;
m.pixelType = FormatTools.UINT8;
m.rgb = false;
m.indexed = false;
m.interleaved = false;
m.dimensionOrder = "XYCZT";
MetadataStore store = makeFilterMetadata();
MetadataTools.populatePixels(store, this);
}
}