TIFFLSBCompressor.java

/*
 * Copyright (c) 2005, 2015, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code 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
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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package com.sun.imageio.plugins.tiff;

import javax.imageio.plugins.tiff.BaselineTIFFTagSet;
import java.io.IOException;

/**
 * Uncompressed data with LSB-to-MSB fill order.
 */
public class TIFFLSBCompressor extends TIFFCompressor {

    public TIFFLSBCompressor() {
        super("", BaselineTIFFTagSet.COMPRESSION_NONE, true);
    }

    public int encode(byte[] b, int off,
                      int width, int height,
                      int[] bitsPerSample,
                      int scanlineStride) throws IOException {
        int bitsPerPixel = 0;
        for (int i = 0; i < bitsPerSample.length; i++) {
            bitsPerPixel += bitsPerSample[i];
        }
        int bytesPerRow = (bitsPerPixel*width + 7)/8;
        byte[] compData = new byte[bytesPerRow];
        byte[] flipTable = TIFFFaxDecompressor.flipTable;
        for (int row = 0; row < height; row++) {
            System.arraycopy(b, off, compData, 0, bytesPerRow);
            for(int j = 0; j < bytesPerRow; j++) {
                compData[j] = flipTable[compData[j]&0xff];
            }
            stream.write(compData, 0, bytesPerRow);
            off += scanlineStride;
        }
        return height*bytesPerRow;
    }
}