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-/* Copyright (C) 2004 Free Software Foundation
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package java.awt.image;
-
-import gnu.java.awt.Buffers;
-
-/**
- * MultiPixelPackedSampleModel provides a single band model that supports
- * multiple pixels in a single unit. Pixels have 2^n bits and 2^k pixels fit
- * per data element.
- *
- * @author Jerry Quinn (jlquinn@optonline.net)
- */
-public class MultiPixelPackedSampleModel extends SampleModel
-{
- private int scanlineStride;
- private int[] bitMasks;
- private int[] bitOffsets;
- private int[] sampleSize;
- private int dataBitOffset;
- private int elemBits;
- private int numberOfBits;
- private int numElems;
-
- public MultiPixelPackedSampleModel(int dataType, int w, int h,
- int numberOfBits)
- {
- this(dataType, w, h, numberOfBits, 0, 0);
- }
-
- public MultiPixelPackedSampleModel(int dataType, int w, int h,
- int numberOfBits, int scanlineStride,
- int dataBitOffset)
- {
- super(dataType, w, h, 1);
-
- switch (dataType)
- {
- case DataBuffer.TYPE_BYTE:
- elemBits = 8;
- break;
- case DataBuffer.TYPE_USHORT:
- elemBits = 16;
- break;
- case DataBuffer.TYPE_INT:
- elemBits = 32;
- break;
- default:
- throw new IllegalArgumentException("MultiPixelPackedSampleModel"
- + " unsupported dataType");
- }
-
- this.dataBitOffset = dataBitOffset;
-
- this.numberOfBits = numberOfBits;
- if (numberOfBits > elemBits)
- throw new RasterFormatException("MultiPixelPackedSampleModel pixel size"
- + " larger than dataType");
- switch (numberOfBits)
- {
- case 1: case 2: case 4: case 8: case 16: case 32: break;
- default:
- throw new RasterFormatException("MultiPixelPackedSampleModel pixel"
- + " size not 2^n bits");
- }
- numElems = elemBits / numberOfBits;
-
- // Compute scan line large enough for w pixels.
- if (scanlineStride == 0)
- scanlineStride = ((dataBitOffset + w * numberOfBits) / elemBits);
- this.scanlineStride = scanlineStride;
-
-
- sampleSize = new int[1];
- sampleSize[0] = numberOfBits;
-
- bitMasks = new int[numElems];
- bitOffsets = new int[numElems];
- for (int i=0; i < numElems; i++)
- {
- bitOffsets[numElems - i- 1] = numberOfBits * i;
- bitMasks[numElems - i - 1] = ((1 << numberOfBits) - 1) <<
- bitOffsets[numElems - i - 1];
- }
- }
-
- public SampleModel createCompatibleSampleModel(int w, int h)
- {
- /* FIXME: We can avoid recalculation of bit offsets and sample
- sizes here by passing these from the current instance to a
- special private constructor. */
- return new MultiPixelPackedSampleModel(dataType, w, h, numberOfBits);
- }
-
-
- /**
- * Creates a DataBuffer for holding pixel data in the format and
- * layout described by this SampleModel. The returned buffer will
- * consist of one single bank.
- */
- public DataBuffer createDataBuffer()
- {
- int size;
-
- // FIXME: The comment refers to SinglePixelPackedSampleModel. See if the
- // same can be done for MultiPixelPackedSampleModel.
- // We can save (scanlineStride - width) pixels at the very end of
- // the buffer. The Sun reference implementation (J2SE 1.3.1 and
- // 1.4.1_01) seems to do this; tested with Mauve test code.
- size = scanlineStride * height;
-
- return Buffers.createBuffer(getDataType(), size);
- }
-
-
- public int getNumDataElements()
- {
- return 1;
- }
-
- public int[] getSampleSize()
- {
- return sampleSize;
- }
-
- public int getSampleSize(int band)
- {
- return sampleSize[0];
- }
-
- public int getOffset(int x, int y)
- {
- return scanlineStride * y + ((dataBitOffset + x*numberOfBits) / elemBits);
- }
-
- public int getBitOffset(int x)
- {
- return (dataBitOffset + x*numberOfBits) % elemBits;
- }
-
- public int getDataBitOffset()
- {
- return dataBitOffset;
- }
-
- public int getScanlineStride()
- {
- return scanlineStride;
- }
-
- public int getPixelBitStride()
- {
- return numberOfBits;
- }
-
-
- public SampleModel createSubsetSampleModel(int[] bands)
- {
- int numBands = bands.length;
- if (numBands != 1)
- throw new RasterFormatException("MultiPixelPackedSampleModel only"
- + " supports one band");
-
- return new MultiPixelPackedSampleModel(dataType, width, height,
- numberOfBits, scanlineStride,
- dataBitOffset);
- }
-
- /**
- * Extract one pixel and return in an array of transfer type.
- *
- * Extracts the pixel at x, y from data and stores into the 0th index of the
- * array obj, since there is only one band. If obj is null, a new array of
- * getTransferType() is created.
- *
- * @param x The x-coordinate of the pixel rectangle to store in <code>obj</code>.
- * @param y The y-coordinate of the pixel rectangle to store in <code>obj</code>.
- * @param obj The primitive array to store the pixels into or null to force creation.
- * @param data The DataBuffer that is the source of the pixel data.
- * @return The primitive array containing the pixel data.
- * @see java.awt.image.SampleModel#getDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer)
- */
- public Object getDataElements(int x, int y, Object obj,
- DataBuffer data)
- {
- int pixel = getSample(x, y, 0, data);
- switch (getTransferType())
- {
- case DataBuffer.TYPE_BYTE:
- if (obj == null) obj = new byte[1];
- ((byte[])obj)[0] = (byte)pixel;
- return obj;
- case DataBuffer.TYPE_USHORT:
- if (obj == null) obj = new short[1];
- ((short[])obj)[0] = (short)pixel;
- return obj;
- case DataBuffer.TYPE_INT:
- if (obj == null) obj = new int[1];
- ((int[])obj)[0] = pixel;
- return obj;
- default:
- // Seems like the only sensible thing to do.
- throw new ClassCastException();
- }
- }
-
- public int[] getPixel(int x, int y, int[] iArray, DataBuffer data)
- {
- if (iArray == null) iArray = new int[1];
- iArray[0] = getSample(x, y, 0, data);
-
- return iArray;
- }
-
- public int[] getPixels(int x, int y, int w, int h, int[] iArray,
- DataBuffer data)
- {
- int offset = getOffset(x, y);
- if (iArray == null) iArray = new int[w*h];
- int outOffset = 0;
- for (y=0; y<h; y++)
- {
- int lineOffset = offset;
- for (x=0; x<w;)
- {
- int samples = data.getElem(lineOffset++);
- for (int b=0; b<numElems && x<w; b++)
- {
- iArray[outOffset++] = (samples & bitMasks[b]) >>> bitOffsets[b];
- x++;
- }
- }
- offset += scanlineStride;
- }
- return iArray;
- }
-
- public int getSample(int x, int y, int b, DataBuffer data)
- {
- int pos =
- ((dataBitOffset + x * numberOfBits) % elemBits) / numberOfBits;
- int offset = getOffset(x, y);
- int samples = data.getElem(offset);
- return (samples & bitMasks[pos]) >>> bitOffsets[pos];
- }
-
- /**
- * Set the pixel at x, y to the value in the first element of the primitive
- * array obj.
- *
- * @param x The x-coordinate of the data elements in <code>obj</code>.
- * @param y The y-coordinate of the data elements in <code>obj</code>.
- * @param obj The primitive array containing the data elements to set.
- * @param data The DataBuffer to store the data elements into.
- * @see java.awt.image.SampleModel#setDataElements(int, int, int, int, java.lang.Object, java.awt.image.DataBuffer)
- */
- public void setDataElements(int x, int y, Object obj, DataBuffer data)
- {
- int transferType = getTransferType();
- if (getTransferType() != data.getDataType())
- {
- throw new IllegalArgumentException("transfer type ("+
- getTransferType()+"), "+
- "does not match data "+
- "buffer type (" +
- data.getDataType() +
- ").");
- }
-
- int offset = getOffset(x, y);
-
- try
- {
- switch (transferType)
- {
- case DataBuffer.TYPE_BYTE:
- {
- DataBufferByte out = (DataBufferByte) data;
- byte[] in = (byte[]) obj;
- out.getData()[offset] = in[0];
- return;
- }
- case DataBuffer.TYPE_USHORT:
- {
- DataBufferUShort out = (DataBufferUShort) data;
- short[] in = (short[]) obj;
- out.getData()[offset] = in[0];
- return;
- }
- case DataBuffer.TYPE_INT:
- {
- DataBufferInt out = (DataBufferInt) data;
- int[] in = (int[]) obj;
- out.getData()[offset] = in[0];
- return;
- }
- default:
- throw new ClassCastException("Unsupported data type");
- }
- }
- catch (ArrayIndexOutOfBoundsException aioobe)
- {
- String msg = "While writing data elements" +
- ", x="+x+", y="+y+
- ", width="+width+", height="+height+
- ", scanlineStride="+scanlineStride+
- ", offset="+offset+
- ", data.getSize()="+data.getSize()+
- ", data.getOffset()="+data.getOffset()+
- ": " +
- aioobe;
- throw new ArrayIndexOutOfBoundsException(msg);
- }
- }
-
- public void setPixel(int x, int y, int[] iArray, DataBuffer data)
- {
- setSample(x, y, 0, iArray[0], data);
- }
-
- public void setSample(int x, int y, int b, int s, DataBuffer data)
- {
- int bitpos =
- ((dataBitOffset + x * numberOfBits) % elemBits) / numberOfBits;
- int offset = getOffset(x, y);
-
- s = s << bitOffsets[bitpos];
- s = s & bitMasks[bitpos];
-
- int sample = data.getElem(offset);
- sample |= s;
- data.setElem(offset, sample);
- }
-
- /**
- * Creates a String with some information about this SampleModel.
- * @return A String describing this SampleModel.
- * @see java.lang.Object#toString()
- */
- public String toString()
- {
- StringBuffer result = new StringBuffer();
- result.append(getClass().getName());
- result.append("[");
- result.append("scanlineStride=").append(scanlineStride);
- for(int i=0; i < bitMasks.length; i+=1)
- {
- result.append(", mask[").append(i).append("]=0x").append(Integer.toHexString(bitMasks[i]));
- }
-
- result.append("]");
- return result.toString();
- }
-}