545 lines
15 KiB
Java
545 lines
15 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., 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 java.awt.image;
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import gnu.java.awt.Buffers;
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/* FIXME: This class does not yet support data type TYPE_SHORT */
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/**
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* ComponentSampleModel supports a flexible organization of pixel samples in
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* memory, permitting pixel samples to be interleaved by band, by scanline,
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* and by pixel.
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*
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* A DataBuffer for this sample model has K banks of data. Pixels have N
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* samples, so there are N bands in the DataBuffer. Each band is completely
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* contained in one bank of data, but a bank may contain more than one band.
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* Each pixel sample is stored in a single data element.
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*
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* Within a bank, each band begins at an offset stored in bandOffsets. The
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* banks containing the band is given by bankIndices. Within the bank, there
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* are three dimensions - band, pixel, and scanline. The dimension ordering
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* is controlled by bandOffset, pixelStride, and scanlineStride, which means
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* that any combination of interleavings is supported.
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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 ComponentSampleModel extends SampleModel
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{
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protected int[] bandOffsets;
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protected int[] bankIndices;
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// FIXME: Should we really shadow the numBands in the superclass?
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//protected int numBands;
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/** Used when creating data buffers. */
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protected int numBanks;
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protected int scanlineStride;
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protected int pixelStride;
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private boolean tightPixelPacking = false;
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public ComponentSampleModel(int dataType,
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int w, int h,
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int pixelStride,
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int scanlineStride,
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int[] bandOffsets)
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{
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this(dataType, w, h, pixelStride, scanlineStride,
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new int[bandOffsets.length], bandOffsets);
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}
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public ComponentSampleModel(int dataType,
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int w, int h,
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int pixelStride,
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int scanlineStride,
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int[] bankIndices,
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int[] bandOffsets)
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{
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super(dataType, w, h, bandOffsets.length);
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if ((pixelStride<0) || (scanlineStride<0) ||
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(bandOffsets.length<1) ||
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(bandOffsets.length != bankIndices.length))
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throw new IllegalArgumentException();
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this.bandOffsets = bandOffsets;
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this.bankIndices = bankIndices;
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this.numBanks = 0;
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for (int b=0; b<bankIndices.length; b++)
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this.numBanks = Math.max(this.numBanks, bankIndices[b]+1);
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this.scanlineStride = scanlineStride;
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this.pixelStride = pixelStride;
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// See if we can use some speedups
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/* FIXME: May these checks should be reserved for the
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PixelInterleavedSampleModel? */
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if (pixelStride == numBands)
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{
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tightPixelPacking = true;
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for (int b=0; b<numBands; b++) {
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if ((bandOffsets[b] != b) || (bankIndices[b] !=0))
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{
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tightPixelPacking = false;
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break;
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}
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}
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}
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}
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public SampleModel createCompatibleSampleModel(int w, int h)
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{
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return new ComponentSampleModel(dataType, w, h, pixelStride,
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scanlineStride, bankIndices,
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bandOffsets);
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}
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public SampleModel createSubsetSampleModel(int[] bands)
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{
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int numBands = bands.length;
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int[] bankIndices = new int[numBands];
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int[] bandOffsets = new int[numBands];
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for (int b=0; b<numBands; b++)
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{
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bankIndices[b] = this.bankIndices[bands[b]];
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bandOffsets[b] = this.bandOffsets[bands[b]];
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}
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return new ComponentSampleModel(dataType, width, height, pixelStride,
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scanlineStride, bankIndices,
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bandOffsets);
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}
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public DataBuffer createDataBuffer()
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{
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// Maybe this value should be precalculated in the constructor?
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int highestOffset = 0;
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for (int b=0; b<numBands; b++)
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{
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highestOffset = Math.max(highestOffset, bandOffsets[b]);
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}
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int size = pixelStride*(width-1) + scanlineStride*(height-1) +
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highestOffset + 1;
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return Buffers.createBuffer(getDataType(), size, numBanks);
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}
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public int getOffset(int x, int y)
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{
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return getOffset(x, y, 0);
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}
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public int getOffset(int x, int y, int b)
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{
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return bandOffsets[b] + pixelStride*x + scanlineStride*y;
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}
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public final int[] getSampleSize()
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{
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int size = DataBuffer.getDataTypeSize(getDataType());
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int[] sizes = new int[numBands];
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java.util.Arrays.fill(sizes, size);
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return sizes;
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}
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public final int getSampleSize(int band)
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{
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return DataBuffer.getDataTypeSize(getDataType());
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}
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public final int[] getBankIndices()
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{
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return bankIndices;
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}
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public final int[] getBandOffsets()
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{
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return bandOffsets;
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}
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public final int getScanlineStride()
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{
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return scanlineStride;
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}
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public final int getPixelStride()
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{
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return pixelStride;
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}
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public final int getNumDataElements()
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{
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return numBands;
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}
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public Object getDataElements(int x, int y, Object obj, DataBuffer data)
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{
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int xyOffset = pixelStride*x + scanlineStride*y;
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int[] totalBandDataOffsets = new int[numBands];
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/* Notice that band and bank offsets are different. Band offsets
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are managed by the sample model, and bank offsets are managed
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by the data buffer. Both must be accounted for. */
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/* FIXME: For single pixels, it is probably easier to simple
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call getElem instead of calculating the bank offset ourself.
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On the other hand, then we need to push the value through
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the int type returned by the getElem method. */
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int[] bankOffsets = data.getOffsets();
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for (int b=0; b<numBands; b++)
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{
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totalBandDataOffsets[b] =
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bandOffsets[b]+bankOffsets[bankIndices[b]] + xyOffset;
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}
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try
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{
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switch (getTransferType())
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{
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case DataBuffer.TYPE_BYTE:
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DataBufferByte inByte = (DataBufferByte) data;
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byte[] outByte = (byte[]) obj;
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if (outByte == null) outByte = new byte[numBands];
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for (int b=0; b<numBands; b++)
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{
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int dOffset = totalBandDataOffsets[b];
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outByte[b] = inByte.getData(bankIndices[b])[dOffset];
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}
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return outByte;
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case DataBuffer.TYPE_USHORT:
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DataBufferUShort inUShort = (DataBufferUShort) data;
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short[] outUShort = (short[]) obj;
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if (outUShort == null) outUShort = new short[numBands];
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for (int b=0; b<numBands; b++)
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{
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int dOffset = totalBandDataOffsets[b];
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outUShort[b] = inUShort.getData(bankIndices[b])[dOffset];
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}
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return outUShort;
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case DataBuffer.TYPE_SHORT:
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DataBufferShort inShort = (DataBufferShort) data;
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short[] outShort = (short[]) obj;
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if (outShort == null) outShort = new short[numBands];
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for (int b=0; b<numBands; b++)
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{
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int dOffset = totalBandDataOffsets[b];
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outShort[b] = inShort.getData(bankIndices[b])[dOffset];
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}
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return outShort;
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case DataBuffer.TYPE_INT:
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DataBufferInt inInt = (DataBufferInt) data;
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int[] outInt = (int[]) obj;
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if (outInt == null) outInt = new int[numBands];
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for (int b=0; b<numBands; b++)
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{
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int dOffset = totalBandDataOffsets[b];
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outInt[b] = inInt.getData(bankIndices[b])[dOffset];
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}
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return outInt;
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case DataBuffer.TYPE_FLOAT:
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DataBufferFloat inFloat = (DataBufferFloat) data;
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float[] outFloat = (float[]) obj;
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if (outFloat == null) outFloat = new float[numBands];
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for (int b=0; b<numBands; b++)
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{
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int dOffset = totalBandDataOffsets[b];
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outFloat[b] = inFloat.getData(bankIndices[b])[dOffset];
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}
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return outFloat;
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case DataBuffer.TYPE_DOUBLE:
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DataBufferDouble inDouble = (DataBufferDouble) data;
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double[] outDouble = (double[]) obj;
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if (outDouble == null) outDouble = new double[numBands];
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for (int b=0; b<numBands; b++)
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{
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int dOffset = totalBandDataOffsets[b];
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outDouble[b] = inDouble.getData(bankIndices[b])[dOffset];
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}
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return outDouble;
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default:
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throw new IllegalStateException("unknown transfer type " +
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getTransferType());
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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 reading data elements, " +
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"x=" + x + ", y=" + y +", " + ", xyOffset=" + xyOffset +
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", data.getSize()=" + data.getSize() + ": " + aioobe;
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throw new ArrayIndexOutOfBoundsException(msg);
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}
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}
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public Object getDataElements(int x, int y, int w, int h, Object obj,
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DataBuffer data)
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{
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if (!tightPixelPacking)
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{
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return super.getDataElements(x, y, w, h, obj, data);
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}
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// using get speedup
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// We can copy whole rows
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int rowSize = w*numBands;
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int dataSize = rowSize*h;
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DataBuffer transferBuffer =
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Buffers.createBuffer(getTransferType(), obj, dataSize);
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obj = Buffers.getData(transferBuffer);
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int inOffset =
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pixelStride*x +
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scanlineStride*y +
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data.getOffset(); // Assumes only one band is used
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/* We don't add band offsets since we assume that bands have
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offsets 0, 1, 2, ... */
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// See if we can copy everything in one go
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if (scanlineStride == rowSize)
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{
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// Collapse scan lines:
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rowSize *= h;
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// We ignore scanlineStride since it won't be of any use
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h = 1;
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}
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int outOffset = 0;
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Object inArray = Buffers.getData(data);
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for (int yd = 0; yd<h; yd++)
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{
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System.arraycopy(inArray, inOffset, obj, outOffset, rowSize);
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inOffset += scanlineStride;
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outOffset += rowSize;
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}
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return obj;
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}
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public void setDataElements(int x, int y, int w, int h,
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Object obj, DataBuffer data)
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{
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if (!tightPixelPacking)
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{
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super.setDataElements(x, y, w, h, obj, data);
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return;
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}
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// using set speedup, we can copy whole rows
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int rowSize = w*numBands;
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int dataSize = rowSize*h;
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DataBuffer transferBuffer =
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Buffers.createBufferFromData(getTransferType(), obj, dataSize);
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int[] bankOffsets = data.getOffsets();
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int outOffset =
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pixelStride*x +
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scanlineStride*y +
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bankOffsets[0]; // same assuptions as in get...
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// See if we can copy everything in one go
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if (scanlineStride == rowSize)
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{
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// Collapse scan lines:
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rowSize *= h;
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h = 1;
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}
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int inOffset = 0;
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Object outArray = Buffers.getData(data);
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for (int yd = 0; yd<h; yd++)
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{
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System.arraycopy(obj, inOffset, outArray, outOffset, rowSize);
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outOffset += scanlineStride;
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inOffset += rowSize;
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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 = pixelStride*x + scanlineStride*y;
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if (iArray == null) iArray = new int[numBands];
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for (int b=0; b<numBands; b++)
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{
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iArray[b] = data.getElem(bankIndices[b], offset+bandOffsets[b]);
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}
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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 = pixelStride*x + scanlineStride*y;
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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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for (int b=0; b<numBands; b++)
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{
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iArray[outOffset++] =
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data.getElem(bankIndices[b], lineOffset+bandOffsets[b]);
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}
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lineOffset += pixelStride;
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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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return data.getElem(bankIndices[b], getOffset(x, y, 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 = pixelStride*x + scanlineStride*y;
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int[] totalBandDataOffsets = new int[numBands];
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int[] bankOffsets = data.getOffsets();
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for (int b=0; b<numBands; b++)
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totalBandDataOffsets[b] =
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bandOffsets[b]+bankOffsets[bankIndices[b]] + offset;
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switch (getTransferType())
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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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for (int b=0; b<numBands; b++)
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out.getData(bankIndices[b])[totalBandDataOffsets[b]] = in[b];
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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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for (int b=0; b<numBands; b++)
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out.getData(bankIndices[b])[totalBandDataOffsets[b]] = in[b];
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return;
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}
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case DataBuffer.TYPE_SHORT:
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{
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DataBufferShort out = (DataBufferShort) data;
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short[] in = (short[]) obj;
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for (int b=0; b<numBands; b++)
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out.getData(bankIndices[b])[totalBandDataOffsets[b]] = in[b];
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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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for (int b=0; b<numBands; b++)
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out.getData(bankIndices[b])[totalBandDataOffsets[b]] = in[b];
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return;
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}
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case DataBuffer.TYPE_FLOAT:
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{
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DataBufferFloat out = (DataBufferFloat) data;
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float[] in = (float[]) obj;
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for (int b=0; b<numBands; b++)
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out.getData(bankIndices[b])[totalBandDataOffsets[b]] = in[b];
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return;
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}
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case DataBuffer.TYPE_DOUBLE:
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{
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DataBufferDouble out = (DataBufferDouble) data;
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double[] in = (double[]) obj;
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for (int b=0; b<numBands; b++)
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out.getData(bankIndices[b])[totalBandDataOffsets[b]] = in[b];
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return;
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}
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default:
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throw new UnsupportedOperationException("transfer type not " +
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"implemented");
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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 = pixelStride*x + scanlineStride*y;
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for (int b=0; b<numBands; b++)
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data.setElem(bankIndices[b], offset+bandOffsets[b], iArray[b]);
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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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data.setElem(bankIndices[b], getOffset(x, y, b), s);
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|
}
|
|
}
|