274 lines
7.3 KiB
Java
274 lines
7.3 KiB
Java
/* Copyright (C) 2000, 2002 Free Software Foundation
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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., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 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 java.awt.image;
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import gnu.java.awt.BitMaskExtent;
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import gnu.java.awt.Buffers;
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/**
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* @author Rolf W. Rasmussen <rolfwr@ii.uib.no>
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*/
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public class SinglePixelPackedSampleModel extends SampleModel
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{
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private int scanlineStride;
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private int[] bitMasks;
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private int[] bitOffsets;
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private int[] sampleSize;;
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public SinglePixelPackedSampleModel(int dataType, int w, int h,
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int[] bitMasks)
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{
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this(dataType, w, h, w, bitMasks);
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}
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public SinglePixelPackedSampleModel(int dataType, int w, int h,
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int scanlineStride, int[] bitMasks)
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{
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super(dataType, w, h, bitMasks.length);
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this.scanlineStride = scanlineStride;
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this.bitMasks = bitMasks;
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bitOffsets = new int[numBands];
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sampleSize = new int[numBands];
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BitMaskExtent extent = new BitMaskExtent();
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for (int b=0; b<numBands; b++)
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{
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extent.setMask(bitMasks[b]);
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sampleSize[b] = extent.bitWidth;
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bitOffsets[b] = extent.leastSignificantBit;
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}
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}
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public int getNumDataElements()
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{
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return 1;
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}
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public SampleModel createCompatibleSampleModel(int w, int h)
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{
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/* FIXME: We can avoid recalculation of bit offsets and sample
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sizes here by passing these from the current instance to a
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special private constructor. */
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return new SinglePixelPackedSampleModel(dataType, w, h, bitMasks);
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}
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public DataBuffer createDataBuffer()
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{
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// Important: use scanlineStride here, not width!
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int size = scanlineStride*height;
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return Buffers.createBuffer(getDataType(), size);
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}
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public int[] getSampleSize()
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{
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return sampleSize;
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}
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public int getSampleSize(int band)
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{
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return sampleSize[band];
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}
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public int getOffset(int x, int y)
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{
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return scanlineStride*y + x;
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}
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public int[] getBitOffsets()
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{
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return bitOffsets;
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}
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public int[] getBitMasks()
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{
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return bitMasks;
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}
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public int getScanlineStride()
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{
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return scanlineStride;
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}
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public SampleModel createSubsetSampleModel(int[] bands)
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{
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// FIXME: Is this the right way to interpret bands?
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int numBands = bands.length;
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int[] bitMasks = new int[numBands];
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for (int b=0; b<numBands; b++)
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bitMasks[b] = this.bitMasks[bands[b]];
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return new SinglePixelPackedSampleModel(dataType, width, height,
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scanlineStride, bitMasks);
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}
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public Object getDataElements(int x, int y, Object obj,
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DataBuffer data)
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{
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int offset = scanlineStride*y + x + data.getOffset();
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return Buffers.getData(data, offset, obj,
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0, // destination offset,
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1 // length
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);
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}
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public int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
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{
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int offset = scanlineStride*y + x;
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if (iArray == null) iArray = new int[numBands];
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int samples = data.getElem(offset);
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for (int b=0; b<numBands; b++)
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iArray[b] = (samples & bitMasks[b]) >>> bitOffsets[b];
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return iArray;
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}
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public int[] getPixels(int x, int y, int w, int h, int[] iArray,
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DataBuffer data)
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{
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int offset = scanlineStride*y + x;
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if (iArray == null) iArray = new int[numBands*w*h];
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int outOffset = 0;
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for (y=0; y<h; y++)
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{
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int lineOffset = offset;
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for (x=0; x<w; x++)
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{
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int samples = data.getElem(lineOffset++);
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for (int b=0; b<numBands; b++)
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iArray[outOffset++] = (samples & bitMasks[b]) >>> bitOffsets[b];
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}
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offset += scanlineStride;
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}
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return iArray;
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}
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public int getSample(int x, int y, int b, DataBuffer data)
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{
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int offset = scanlineStride*y + x;
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int samples = data.getElem(offset);
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return (samples & bitMasks[b]) >>> bitOffsets[b];
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}
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public void setDataElements(int x, int y, Object obj, DataBuffer data)
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{
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int offset = scanlineStride*y + x + data.getOffset();
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int transferType = getTransferType();
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if (getTransferType() != data.getDataType())
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{
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throw new IllegalArgumentException("transfer type ("+
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getTransferType()+"), "+
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"does not match data "+
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"buffer type (" +
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data.getDataType() +
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").");
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}
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try
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{
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switch (transferType)
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{
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case DataBuffer.TYPE_BYTE:
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{
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DataBufferByte out = (DataBufferByte) data;
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byte[] in = (byte[]) obj;
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out.getData()[offset] = in[0];
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return;
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}
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case DataBuffer.TYPE_USHORT:
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{
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DataBufferUShort out = (DataBufferUShort) data;
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short[] in = (short[]) obj;
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out.getData()[offset] = in[0];
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return;
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}
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case DataBuffer.TYPE_INT:
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{
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DataBufferInt out = (DataBufferInt) data;
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int[] in = (int[]) obj;
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out.getData()[offset] = in[0];
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return;
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}
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// FIXME: Fill in the other possible types.
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default:
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throw new InternalError();
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}
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}
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catch (ArrayIndexOutOfBoundsException aioobe)
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{
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String msg = "While writing data elements" +
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", x="+x+", y="+y+
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", width="+width+", height="+height+
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", scanlineStride="+scanlineStride+
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", offset="+offset+
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", data.getSize()="+data.getSize()+
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", data.getOffset()="+data.getOffset()+
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": " +
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aioobe;
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throw new ArrayIndexOutOfBoundsException(msg);
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}
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}
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public void setPixel(int x, int y, int[] iArray, DataBuffer data)
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{
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int offset = scanlineStride*y + x;
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int samples = 0;
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for (int b=0; b<numBands; b++)
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samples |= (iArray[b] << bitOffsets[b]) & bitMasks[b];
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data.setElem(offset, samples);
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}
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public void setSample(int x, int y, int b, int s, DataBuffer data)
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{
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int offset = scanlineStride*y + x;
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int samples = data.getElem(offset);
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int bitMask = bitMasks[b];
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samples &= ~bitMask;
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samples |= (s << bitOffsets[b]) & bitMask;
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data.setElem(offset, samples);
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}
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}
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