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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [javax/] [imageio/] [bmp/] [DecodeRLE8.java] - Blame information for rev 769

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1 769 jeremybenn
/* DecodeRLE8.java --
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   Copyright (C)  2005  Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING.  If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library.  Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module.  An independent module is a module which is not derived from
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or based on this library.  If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so.  If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.javax.imageio.bmp;
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import java.io.IOException;
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import javax.imageio.stream.ImageInputStream;
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import java.awt.image.BufferedImage;
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import java.awt.image.IndexColorModel;
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import java.awt.image.Raster;
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import java.awt.image.WritableRaster;
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import java.awt.image.DataBuffer;
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import java.awt.image.DataBufferByte;
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import java.awt.image.SinglePixelPackedSampleModel;
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import java.awt.image.SampleModel;
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import java.awt.Dimension;
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public class DecodeRLE8 extends BMPDecoder {
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    public DecodeRLE8(BMPFileHeader fh, BMPInfoHeader ih){
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        super(fh, ih);
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    }
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    /**
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     * RLE control codes
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     */
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    private static final byte ESCAPE = (byte)0;
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    private static final byte EOL = (byte)0; // end of line
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    private static final byte EOB = (byte)1; // end of bitmap
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    private static final byte DELTA = (byte)2; // delta
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    public BufferedImage decode(ImageInputStream in) throws IOException, BMPException {
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        IndexColorModel palette = readPalette(in);
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        skipToImage(in);
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        Dimension d = infoHeader.getSize();
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        int h = (int)d.getHeight();
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        int w = (int)d.getWidth();
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        byte[] data = uncompress(w, h, in);
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        SampleModel sm = new SinglePixelPackedSampleModel(DataBuffer.TYPE_BYTE,
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                                                          w, h,
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                                                          new int[] {0xFF});
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        DataBuffer db = new DataBufferByte(data, w*h, 0);
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        WritableRaster raster = Raster.createWritableRaster(sm, db, null);
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        return new BufferedImage(palette, raster, false, null);
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    }
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    private byte[] uncompress(int w, int h, ImageInputStream in)
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        throws BMPException, IOException {
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        byte[] cmd = new byte[2];
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        byte[] data = new byte[w*h];
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        int offIn = 0;
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        int x=0,y=0;
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        try {
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            while((x + y*w) < w*h){
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                if(in.read(cmd) != 2)
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                    throw new IOException("Error reading compressed data.");
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                if(cmd[0] == ESCAPE){
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                    switch(cmd[1]){
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                    case EOB: // end of bitmap
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                        return data;
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                    case EOL: // end of line
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                        x = 0;
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                        y++;
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                        break;
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                    case DELTA: // delta
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                        if(in.read(cmd) != 2)
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                            throw new IOException("Error reading compressed data.");
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                        int dx = cmd[0] & (0xFF);
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                        int dy = cmd[1] & (0xFF);
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                        x += dx;
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                        y += dy;
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                        break;
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                    default:
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                        // decode a literal run
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                        int length = cmd[1] & (0xFF);
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                        int copylength = length;
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                        // absolute mode must be word-aligned
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                        length += (length & 1);
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                        byte[] run = new byte[length];
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                        if(in.read(run) != length)
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                            throw new IOException("Error reading compressed data.");
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                        System.arraycopy(run, 0, data, (x+w*(h-y-1)),
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                                         copylength);
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                        x += copylength;
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                        break;
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                    }
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                } else {
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                    // decode a byte run
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                    int length = cmd[0] & (0xFF);
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                    for(int i=0;i<length;i++)
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                        data[(h-y-1)*w + x++] = cmd[1];
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                }
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            }
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            return data;
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        } catch(ArrayIndexOutOfBoundsException e){
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            throw new BMPException("Invalid RLE data.");
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        }
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    }
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}

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