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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., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 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, 0, numberOfBits, 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) + 1;
+ 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[i] = numberOfBits * i;
+ bitMasks[i] = ((1 << numberOfBits) - 1) << bitOffsets[i];
+ }
+ }
+
+ 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();
+ }
+}
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