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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libjava/] [classpath/] [gnu/] [javax/] [imageio/] [bmp/] [DecodeBF32.java] - Blame information for rev 769

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1 769 jeremybenn
/* DecodeBF32.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.ColorModel;
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import java.awt.image.DirectColorModel;
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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.DataBufferInt;
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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 DecodeBF32 extends BMPDecoder {
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    private int[] bitmasks;
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    private boolean useDefaultMasks;
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    public DecodeBF32(BMPFileHeader fh, BMPInfoHeader ih,
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                      boolean udm){
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        super(fh,ih);
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        useDefaultMasks = udm;
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        if(useDefaultMasks)
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            bitmasks = new int[] { 0x00FF0000, 0x0000FF00, 0x000000FF };
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    }
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    public BufferedImage decode(ImageInputStream in) throws IOException, BMPException {
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        if(!useDefaultMasks)
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            bitmasks = readBitMasks(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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        // BMP scanlines are padded to dword offsets
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        int scansize = w << 2;
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        int[] data = new int[w*h];
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        for(int y=h-1;y>=0;y--){
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            byte[] scanline = new byte[scansize];
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            if(in.read(scanline) != scansize)
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                throw new IOException("Couldn't read image data.");
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            for(int x=0;x<w;x++)
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                data[x + y*w] = ((scanline[x<<2] & (0xFF)) |
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                                 ((scanline[(x<<2)+1] & (0xFF)) << 8) |
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                                 ((scanline[(x<<2)+2] & (0xFF)) << 16) |
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                                 ((scanline[(x<<2)+3] & (0xFF)) << 24));
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        }
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        ColorModel cm = new DirectColorModel(32,
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                                             bitmasks[0], bitmasks[1], bitmasks[2]);
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        SampleModel sm = new SinglePixelPackedSampleModel(DataBuffer.TYPE_INT,
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                                                          w, h,
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                                                          bitmasks);
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        DataBuffer db = new DataBufferInt(data, w*h);
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        WritableRaster raster = Raster.createWritableRaster(sm, db, null);
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        return new BufferedImage(cm, raster, false, null);
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    }
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}

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