mirror of git://gcc.gnu.org/git/gcc.git
604 lines
19 KiB
Java
604 lines
19 KiB
Java
/* Copyright (C) 2004, 2006, 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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import gnu.java.lang.CPStringBuilder;
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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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/**
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* Creates a new <code>MultiPixelPackedSampleModel</code> with the specified
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* data type, which should be one of:
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* <ul>
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* <li>{@link DataBuffer#TYPE_BYTE};</li>
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* <li>{@link DataBuffer#TYPE_USHORT};</li>
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* <li>{@link DataBuffer#TYPE_INT};</li>
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* </ul>
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*
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* @param dataType the data type.
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* @param w the width (in pixels).
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* @param h the height (in pixels).
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* @param numberOfBits the number of bits per pixel (must be a power of 2).
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*/
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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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/**
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* Creates a new <code>MultiPixelPackedSampleModel</code> with the specified
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* data type, which should be one of:
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* <ul>
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* <li>{@link DataBuffer#TYPE_BYTE};</li>
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* <li>{@link DataBuffer#TYPE_USHORT};</li>
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* <li>{@link DataBuffer#TYPE_INT};</li>
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* </ul>
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*
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* @param dataType the data type.
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* @param w the width (in pixels).
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* @param h the height (in pixels).
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* @param numberOfBits the number of bits per pixel (must be a power of 2).
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* @param scanlineStride the number of data elements from a pixel on one
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* row to the corresponding pixel in the next row.
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* @param dataBitOffset the offset to the first data bit.
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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) - 1) / elemBits + 1;
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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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/**
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* Creates a new <code>MultiPixelPackedSample</code> model with the same
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* data type and bits per pixel as this model, but with the specified
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* dimensions.
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*
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* @param w the width (in pixels).
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* @param h the height (in pixels).
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*
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* @return The new sample model.
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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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* @return A new data buffer.
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*/
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public DataBuffer createDataBuffer()
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{
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int size = scanlineStride * height;
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if (dataBitOffset > 0)
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size += (dataBitOffset - 1) / elemBits + 1;
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return Buffers.createBuffer(getDataType(), size);
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}
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/**
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* Returns the number of data elements required to transfer a pixel in the
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* get/setDataElements() methods.
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*
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* @return <code>1</code>.
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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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/**
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* Returns an array containing the size (in bits) of the samples in each
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* band. The <code>MultiPixelPackedSampleModel</code> class supports only
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* one band, so this method returns an array with length <code>1</code>.
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*
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* @return An array containing the size (in bits) of the samples in band zero.
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*
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* @see #getSampleSize(int)
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*/
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public int[] getSampleSize()
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{
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return (int[]) sampleSize.clone();
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}
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/**
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* Returns the size of the samples in the specified band. Note that the
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* <code>MultiPixelPackedSampleModel</code> supports only one band -- this
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* method ignored the <code>band</code> argument, and always returns the size
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* of band zero.
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*
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* @param band the band (this parameter is ignored).
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*
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* @return The size of the samples in band zero.
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*
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* @see #getSampleSize()
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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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/**
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* Returns the index in the data buffer that stores the pixel at (x, y).
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*
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* @param x the x-coordinate.
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* @param y the y-coordinate.
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*
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* @return The index in the data buffer that stores the pixel at (x, y).
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*
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* @see #getBitOffset(int)
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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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/**
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* The bit offset (within an element in the data buffer) of the pixels with
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* the specified x-coordinate.
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*
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* @param x the x-coordinate.
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*
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* @return The bit offset.
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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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/**
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* Returns the offset to the first data bit.
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*
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* @return The offset to the first data bit.
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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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/**
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* Returns the number of data elements from a pixel in one row to the
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* corresponding pixel in the next row.
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*
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* @return The scanline stride.
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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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/**
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* Returns the number of bits per pixel.
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*
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* @return The number of bits per pixel.
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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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/**
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* Returns the transfer type, which is one of the following (depending on
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* the number of bits per sample for this model):
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* <ul>
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* <li>{@link DataBuffer#TYPE_BYTE};</li>
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* <li>{@link DataBuffer#TYPE_USHORT};</li>
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* <li>{@link DataBuffer#TYPE_INT};</li>
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* </ul>
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*
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* @return The transfer type.
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*/
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public int getTransferType()
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{
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if (numberOfBits <= DataBuffer.getDataTypeSize(DataBuffer.TYPE_BYTE))
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return DataBuffer.TYPE_BYTE;
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else if (numberOfBits <= DataBuffer.getDataTypeSize(DataBuffer.TYPE_USHORT))
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return DataBuffer.TYPE_USHORT;
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return DataBuffer.TYPE_INT;
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}
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/**
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* Normally this method returns a sample model for accessing a subset of
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* bands of image data, but since <code>MultiPixelPackedSampleModel</code>
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* only supports a single band, this overridden implementation just returns
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* a new instance of <code>MultiPixelPackedSampleModel</code>, with the same
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* attributes as this instance.
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*
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* @param bands the bands to include in the subset (this is ignored, except
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* that if it is non-<code>null</code> a check is made to ensure that the
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* array length is equal to <code>1</code>).
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*
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* @throws RasterFormatException if <code>bands</code> is not
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* <code>null</code> and <code>bands.length != 1</code>.
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*/
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public SampleModel createSubsetSampleModel(int[] bands)
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{
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if (bands != null && bands.length != 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, 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
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* <code>obj</code>.
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* @param y The y-coordinate of the pixel rectangle to store in
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* <code>obj</code>.
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* @param obj The primitive array to store the pixels into or null to force
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* 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, Object,
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* DataBuffer)
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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 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)
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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)
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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)
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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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/**
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* Returns an array (of length 1) containing the sample for the pixel at
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* (x, y) in the specified data buffer. If <code>iArray</code> is not
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* <code>null</code>, it will be populated with the sample value and
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* returned as the result of this function (this avoids allocating a new
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* array instance).
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*
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* @param x the x-coordinate of the pixel.
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* @param y the y-coordinate of the pixel.
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* @param iArray an array to populate with the sample values and return as
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* the result (if <code>null</code>, a new array will be allocated).
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* @param data the data buffer (<code>null</code> not permitted).
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*
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* @return An array containing the pixel sample value.
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*
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* @throws NullPointerException if <code>data</code> is <code>null</code>.
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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)
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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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/**
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* Returns the sample value for the pixel at (x, y) in the specified data
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* buffer.
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*
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* @param x the x-coordinate of the pixel.
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* @param y the y-coordinate of the pixel.
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* @param b the band (in the range <code>0</code> to
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* <code>getNumBands() - 1</code>).
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* @param data the data buffer (<code>null</code> not permitted).
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*
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* @return The sample value.
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*
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* @throws NullPointerException if <code>data</code> is <code>null</code>.
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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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*/
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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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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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byte[] in = (byte[]) obj;
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setSample(x, y, 0, in[0] & 0xFF, data);
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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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short[] in = (short[]) obj;
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setSample(x, y, 0, in[0] & 0xFFFF, data);
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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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int[] in = (int[]) obj;
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setSample(x, y, 0, in[0], data);
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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=" + getOffset(x, y) +
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", data.getSize()=" + data.getSize() +
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", data.getOffset()=" + data.getOffset() +
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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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/**
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* Sets the sample value for the pixel at (x, y) in the specified data
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* buffer to the specified value.
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*
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* @param x the x-coordinate of the pixel.
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* @param y the y-coordinate of the pixel.
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* @param iArray the sample value (<code>null</code> not permitted).
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* @param data the data buffer (<code>null</code> not permitted).
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*
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* @throws NullPointerException if either <code>iArray</code> or
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* <code>data</code> is <code>null</code>.
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*
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* @see #setSample(int, int, int, int, DataBuffer)
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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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/**
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* Sets the sample value for a band for the pixel at (x, y) in the
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* specified data buffer.
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*
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* @param x the x-coordinate of the pixel.
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* @param y the y-coordinate of the pixel.
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* @param b the band (in the range <code>0</code> to
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* <code>getNumBands() - 1</code>).
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* @param s the sample value.
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* @param data the data buffer (<code>null</code> not permitted).
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*
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* @throws NullPointerException if <code>data</code> is <code>null</code>.
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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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|
* Tests this sample model for equality with an arbitrary object. This
|
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* method returns <code>true</code> if and only if:
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|
* <ul>
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|
* <li><code>obj</code> is not <code>null</code>;
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* <li><code>obj</code> is an instance of
|
|
* <code>MultiPixelPackedSampleModel</code>;
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|
* <li>both models have the same:
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|
* <ul>
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|
* <li><code>dataType</code>;
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|
* <li><code>width</code>;
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|
* <li><code>height</code>;
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|
* <li><code>numberOfBits</code>;
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|
* <li><code>scanlineStride</code>;
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|
* <li><code>dataBitOffsets</code>.
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|
* </ul>
|
|
* </li>
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|
* </ul>
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|
*
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|
* @param obj the object (<code>null</code> permitted)
|
|
*
|
|
* @return <code>true</code> if this model is equal to <code>obj</code>, and
|
|
* <code>false</code> otherwise.
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|
*/
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|
public boolean equals(Object obj)
|
|
{
|
|
if (this == obj)
|
|
return true;
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|
if (! (obj instanceof MultiPixelPackedSampleModel))
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|
return false;
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|
MultiPixelPackedSampleModel that = (MultiPixelPackedSampleModel) obj;
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|
if (this.dataType != that.dataType)
|
|
return false;
|
|
if (this.width != that.width)
|
|
return false;
|
|
if (this.height != that.height)
|
|
return false;
|
|
if (this.numberOfBits != that.numberOfBits)
|
|
return false;
|
|
if (this.scanlineStride != that.scanlineStride)
|
|
return false;
|
|
if (this.dataBitOffset != that.dataBitOffset)
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns a hash code for this <code>MultiPixelPackedSampleModel</code>.
|
|
*
|
|
* @return A hash code.
|
|
*/
|
|
public int hashCode()
|
|
{
|
|
// this hash code won't match Sun's, but that shouldn't matter...
|
|
int result = 193;
|
|
result = 37 * result + dataType;
|
|
result = 37 * result + width;
|
|
result = 37 * result + height;
|
|
result = 37 * result + numberOfBits;
|
|
result = 37 * result + scanlineStride;
|
|
result = 37 * result + dataBitOffset;
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Creates a String with some information about this SampleModel.
|
|
* @return A String describing this SampleModel.
|
|
* @see java.lang.Object#toString()
|
|
*/
|
|
public String toString()
|
|
{
|
|
CPStringBuilder result = new CPStringBuilder();
|
|
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();
|
|
}
|
|
}
|