mirror of git://gcc.gnu.org/git/gcc.git
389 lines
11 KiB
Java
389 lines
11 KiB
Java
/* Copyright (C) 2004 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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/**
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* MultiPixelPackedSampleModel provides a single band model that supports
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* multiple pixels in a single unit. Pixels have 2^n bits and 2^k pixels fit
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* per data element.
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*
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* @author Jerry Quinn (jlquinn@optonline.net)
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*/
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public class MultiPixelPackedSampleModel 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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private int dataBitOffset;
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private int elemBits;
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private int numberOfBits;
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private int numElems;
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public MultiPixelPackedSampleModel(int dataType, int w, int h,
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int numberOfBits)
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{
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this(dataType, w, h, numberOfBits, 0, 0);
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}
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public MultiPixelPackedSampleModel(int dataType, int w, int h,
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int numberOfBits, int scanlineStride,
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int dataBitOffset)
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{
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super(dataType, w, h, 1);
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switch (dataType)
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{
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case DataBuffer.TYPE_BYTE:
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elemBits = 8;
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break;
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case DataBuffer.TYPE_USHORT:
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elemBits = 16;
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break;
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case DataBuffer.TYPE_INT:
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elemBits = 32;
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break;
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default:
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throw new IllegalArgumentException("MultiPixelPackedSampleModel"
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+ " unsupported dataType");
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}
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this.dataBitOffset = dataBitOffset;
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this.numberOfBits = numberOfBits;
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if (numberOfBits > elemBits)
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throw new RasterFormatException("MultiPixelPackedSampleModel pixel size"
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+ " larger than dataType");
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switch (numberOfBits)
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{
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case 1: case 2: case 4: case 8: case 16: case 32: break;
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default:
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throw new RasterFormatException("MultiPixelPackedSampleModel pixel"
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+ " size not 2^n bits");
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}
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numElems = elemBits / numberOfBits;
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// Compute scan line large enough for w pixels.
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if (scanlineStride == 0)
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scanlineStride = ((dataBitOffset + w * numberOfBits) / elemBits);
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this.scanlineStride = scanlineStride;
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sampleSize = new int[1];
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sampleSize[0] = numberOfBits;
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bitMasks = new int[numElems];
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bitOffsets = new int[numElems];
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for (int i=0; i < numElems; i++)
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{
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bitOffsets[numElems - i- 1] = numberOfBits * i;
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bitMasks[numElems - i - 1] = ((1 << numberOfBits) - 1) <<
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bitOffsets[numElems - i - 1];
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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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/* 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 MultiPixelPackedSampleModel(dataType, w, h, numberOfBits);
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}
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/**
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* Creates a DataBuffer for holding pixel data in the format and
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* layout described by this SampleModel. The returned buffer will
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* consist of one single bank.
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*/
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public DataBuffer createDataBuffer()
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{
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int size;
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// FIXME: The comment refers to SinglePixelPackedSampleModel. See if the
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// same can be done for MultiPixelPackedSampleModel.
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// We can save (scanlineStride - width) pixels at the very end of
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// the buffer. The Sun reference implementation (J2SE 1.3.1 and
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// 1.4.1_01) seems to do this; tested with Mauve test code.
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size = scanlineStride * height;
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return Buffers.createBuffer(getDataType(), size);
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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 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[0];
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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 + ((dataBitOffset + x*numberOfBits) / elemBits);
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}
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public int getBitOffset(int x)
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{
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return (dataBitOffset + x*numberOfBits) % elemBits;
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}
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public int getDataBitOffset()
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{
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return dataBitOffset;
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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 int getPixelBitStride()
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{
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return numberOfBits;
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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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if (numBands != 1)
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throw new RasterFormatException("MultiPixelPackedSampleModel only"
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+ " supports one band");
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return new MultiPixelPackedSampleModel(dataType, width, height,
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numberOfBits, scanlineStride,
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dataBitOffset);
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}
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/**
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* Extract one pixel and return in an array of transfer type.
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*
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* Extracts the pixel at x, y from data and stores into the 0th index of the
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* array obj, since there is only one band. If obj is null, a new array of
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* getTransferType() is created.
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*
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* @param x The x-coordinate of the pixel rectangle to store in <code>obj</code>.
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* @param y The y-coordinate of the pixel rectangle to store in <code>obj</code>.
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* @param obj The primitive array to store the pixels into or null to force creation.
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* @param data The DataBuffer that is the source of the pixel data.
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* @return The primitive array containing the pixel data.
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* @see java.awt.image.SampleModel#getDataElements(int, int, java.lang.Object, java.awt.image.DataBuffer)
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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 pixel = getSample(x, y, 0, data);
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switch (getTransferType())
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{
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case DataBuffer.TYPE_BYTE:
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if (obj == null) obj = new byte[1];
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((byte[])obj)[0] = (byte)pixel;
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return obj;
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case DataBuffer.TYPE_USHORT:
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if (obj == null) obj = new short[1];
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((short[])obj)[0] = (short)pixel;
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return obj;
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case DataBuffer.TYPE_INT:
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if (obj == null) obj = new int[1];
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((int[])obj)[0] = pixel;
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return obj;
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default:
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// Seems like the only sensible thing to do.
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throw new ClassCastException();
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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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if (iArray == null) iArray = new int[1];
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iArray[0] = getSample(x, y, 0, data);
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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 = getOffset(x, y);
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if (iArray == null) iArray = new int[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;)
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{
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int samples = data.getElem(lineOffset++);
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for (int b=0; b<numElems && x<w; b++)
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{
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iArray[outOffset++] = (samples & bitMasks[b]) >>> bitOffsets[b];
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x++;
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}
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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 pos =
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((dataBitOffset + x * numberOfBits) % elemBits) / numberOfBits;
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int offset = getOffset(x, y);
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int samples = data.getElem(offset);
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return (samples & bitMasks[pos]) >>> bitOffsets[pos];
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}
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/**
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* Set the pixel at x, y to the value in the first element of the primitive
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* array obj.
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*
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* @param x The x-coordinate of the data elements in <code>obj</code>.
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* @param y The y-coordinate of the data elements in <code>obj</code>.
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* @param obj The primitive array containing the data elements to set.
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* @param data The DataBuffer to store the data elements into.
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* @see java.awt.image.SampleModel#setDataElements(int, int, int, int, java.lang.Object, java.awt.image.DataBuffer)
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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 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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int offset = getOffset(x, y);
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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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default:
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throw new ClassCastException("Unsupported data type");
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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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setSample(x, y, 0, iArray[0], data);
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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 bitpos =
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((dataBitOffset + x * numberOfBits) % elemBits) / numberOfBits;
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int offset = getOffset(x, y);
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s = s << bitOffsets[bitpos];
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s = s & bitMasks[bitpos];
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int sample = data.getElem(offset);
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sample |= s;
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data.setElem(offset, sample);
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}
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/**
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* Creates a String with some information about this SampleModel.
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* @return A String describing this SampleModel.
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* @see java.lang.Object#toString()
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*/
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public String toString()
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{
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StringBuffer result = new StringBuffer();
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result.append(getClass().getName());
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result.append("[");
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result.append("scanlineStride=").append(scanlineStride);
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for(int i=0; i < bitMasks.length; i+=1)
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{
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result.append(", mask[").append(i).append("]=0x").append(Integer.toHexString(bitMasks[i]));
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}
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result.append("]");
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return result.toString();
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}
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}
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