mirror of git://gcc.gnu.org/git/gcc.git
587 lines
18 KiB
Java
587 lines
18 KiB
Java
/* Copyright (C) 2000, 2002, 2003, 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 java.util.Arrays;
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import gnu.java.awt.BitMaskExtent;
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import gnu.java.lang.CPStringBuilder;
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/**
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* A <code>SampleModel</code> used when all samples are stored in a single
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* data element in the {@link DataBuffer}, and each data element contains
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* samples for one pixel only.
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*
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* @author Rolf W. Rasmussen (rolfwr@ii.uib.no)
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*/
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public class SinglePixelPackedSampleModel 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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/**
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* Creates a new <code>SinglePixelPackedSampleModel</code>.
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*
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* @param dataType the data buffer 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 bitMasks an array containing the bit mask used to extract the
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* sample value for each band.
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*/
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public SinglePixelPackedSampleModel(int dataType, int w, int h,
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int[] bitMasks)
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{
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this(dataType, w, h, w, bitMasks);
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}
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/**
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* Creates a new <code>SinglePixelPackedSampleModel</code>.
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*
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* @param dataType the data buffer 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 scanlineStride the number of data elements between a pixel on one
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* row and the corresponding pixel on the next row.
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* @param bitMasks an array containing the bit mask used to extract the
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* sample value for each band.
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*/
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public SinglePixelPackedSampleModel(int dataType, int w, int h,
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int scanlineStride, int[] bitMasks)
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{
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super(dataType, w, h, bitMasks.length);
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switch (dataType)
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{
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case DataBuffer.TYPE_BYTE:
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case DataBuffer.TYPE_USHORT:
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case DataBuffer.TYPE_INT:
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break;
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default:
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throw new IllegalArgumentException(
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"SinglePixelPackedSampleModel unsupported dataType");
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}
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this.scanlineStride = scanlineStride;
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this.bitMasks = bitMasks;
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bitOffsets = new int[numBands];
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sampleSize = new int[numBands];
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BitMaskExtent extent = new BitMaskExtent();
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for (int b = 0; b < numBands; b++)
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{
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// the mask is an unsigned integer
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long mask = bitMasks[b] & 0xFFFFFFFFL;
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extent.setMask(mask);
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sampleSize[b] = extent.bitWidth;
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bitOffsets[b] = extent.leastSignificantBit;
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}
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}
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/**
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* Returns the number of data elements.
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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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* Creates a new <code>SampleModel</code> that is compatible with this
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* model and has the specified width and height.
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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 SinglePixelPackedSampleModel(dataType, w, h, bitMasks);
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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 The data buffer.
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*/
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public DataBuffer createDataBuffer()
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{
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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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int size = scanlineStride * (height - 1) + width;
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DataBuffer buffer = null;
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switch (getTransferType())
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{
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case DataBuffer.TYPE_BYTE:
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buffer = new DataBufferByte(size);
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break;
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case DataBuffer.TYPE_USHORT:
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buffer = new DataBufferUShort(size);
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break;
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case DataBuffer.TYPE_INT:
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buffer = new DataBufferInt(size);
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break;
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}
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return buffer;
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}
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/**
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* Returns an array containing the size (in bits) for each band accessed by
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* the <code>SampleModel</code>.
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*
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* @return An array.
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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 (in bits) of the samples for the specified band.
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*
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* @param band the band (in the range <code>0</code> to
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* <code>getNumBands() - 1</code>).
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*
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* @return The sample size (in bits).
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*/
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public int getSampleSize(int band)
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{
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return sampleSize[band];
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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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public int getOffset(int x, int y)
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{
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return scanlineStride*y + x;
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}
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public int[] getBitOffsets()
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{
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return bitOffsets;
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}
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public int[] getBitMasks()
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{
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return bitMasks;
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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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* Creates a new <code>SinglePixelPackedSampleModel</code> that accesses
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* the specified subset of bands.
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*
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* @param bands an array containing band indices (<code>null</code> not
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* permitted).
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*
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* @return A new sample model.
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*
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* @throws NullPointerException if <code>bands</code> is <code>null</code>.
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* @throws RasterFormatException if <code>bands.length</code> is greater
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* than the number of bands in this model.
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*/
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public SampleModel createSubsetSampleModel(int[] bands)
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{
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if (bands.length > numBands)
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throw new RasterFormatException("Too many bands.");
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int numBands = bands.length;
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int[] bitMasks = new int[numBands];
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for (int b = 0; b < numBands; b++)
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bitMasks[b] = this.bitMasks[bands[b]];
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return new SinglePixelPackedSampleModel(dataType, width, height,
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scanlineStride, bitMasks);
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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 type = getTransferType();
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Object ret = null;
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switch (type)
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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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if (in == null)
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in = new byte[1];
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in[0] = (byte) data.getElem(x + y * scanlineStride);
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ret = in;
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}
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break;
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case DataBuffer.TYPE_USHORT:
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{
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short[] in = (short[]) obj;
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if (in == null)
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in = new short[1];
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in[0] = (short) data.getElem(x + y * scanlineStride);
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ret = in;
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}
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break;
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case DataBuffer.TYPE_INT:
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{
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int[] in = (int[]) obj;
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if (in == null)
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in = new int[1];
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in[0] = data.getElem(x + y * scanlineStride);
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ret = in;
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}
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break;
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}
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return ret;
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}
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/**
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* Returns an array containing the samples for the pixel at (x, y) in the
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* specified data buffer. If <code>iArray</code> is not <code>null</code>,
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* it will be populated with the sample values and returned as the result of
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* this function (this avoids allocating a new 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 The pixel sample values.
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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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int offset = scanlineStride*y + x;
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if (iArray == null) iArray = new int[numBands];
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int samples = data.getElem(offset);
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for (int b = 0; b < numBands; b++)
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iArray[b] = (samples & bitMasks[b]) >>> bitOffsets[b];
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return iArray;
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}
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/**
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* Returns an array containing the samples for the pixels in the region
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* specified by (x, y, w, h) in the specified data buffer. The array is
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* ordered by pixels (that is, all the samples for the first pixel are
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* grouped together, followed by all the samples for the second pixel, and so
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* on). If <code>iArray</code> is not <code>null</code>, it will be
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* populated with the sample values and returned as the result of this
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* function (this avoids allocating a new array instance).
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*
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* @param x the x-coordinate of the top-left pixel.
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* @param y the y-coordinate of the top-left pixel.
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* @param w the width of the region of pixels.
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* @param h the height of the region of pixels.
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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 The pixel sample values.
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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[] 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 = scanlineStride*y + x;
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if (iArray == null) iArray = new int[numBands*w*h];
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int outOffset = 0;
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for (y = 0; y < h; y++)
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{
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int lineOffset = offset;
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for (x = 0; x < w; x++)
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{
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int samples = data.getElem(lineOffset++);
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for (int b = 0; b < numBands; b++)
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iArray[outOffset++] = (samples & bitMasks[b]) >>> bitOffsets[b];
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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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/**
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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 offset = scanlineStride*y + x;
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int samples = data.getElem(offset);
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return (samples & bitMasks[b]) >>> bitOffsets[b];
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}
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public void setDataElements(int x, int y, Object obj, DataBuffer data)
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{
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int transferType = getTransferType();
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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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data.setElem(y * scanlineStride + x, ((int) in[0]) & 0xff);
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}
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break;
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case DataBuffer.TYPE_USHORT:
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{
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short[] in = (short[]) obj;
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data.setElem(y * scanlineStride + x, ((int) in[0]) & 0xffff);
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}
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break;
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case DataBuffer.TYPE_INT:
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{
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int[] in = (int[]) obj;
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data.setElem(y * scanlineStride + x, in[0]);
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break;
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}
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}
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}
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/**
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* Sets the samples for the pixel at (x, y) in the specified data buffer to
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* the specified values.
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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 values (<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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public void setPixel(int x, int y, int[] iArray, DataBuffer data)
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{
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int offset = scanlineStride*y + x;
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int samples = 0;
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for (int b = 0; b < numBands; b++)
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samples |= (iArray[b] << bitOffsets[b]) & bitMasks[b];
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data.setElem(offset, samples);
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}
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/**
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* This method implements a more efficient way to set pixels than the default
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* implementation of the super class. It copies the pixel components directly
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* from the input array instead of creating a intermediate buffer.
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* @param x The x-coordinate of the pixel rectangle in <code>obj</code>.
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* @param y The y-coordinate of the pixel rectangle in <code>obj</code>.
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* @param w The width of the pixel rectangle in <code>obj</code>.
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* @param h The height of the pixel rectangle in <code>obj</code>.
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* @param iArray The primitive array containing the pixels to set.
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* @param data The DataBuffer to store the pixels into.
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* @see java.awt.image.SampleModel#setPixels(int, int, int, int, int[],
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* java.awt.image.DataBuffer)
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*/
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public void setPixels(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 inOffset = 0;
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for (int yy=y; yy<(y+h); yy++)
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{
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int offset = scanlineStride*yy + x;
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for (int xx=x; xx<(x+w); xx++)
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{
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int samples = 0;
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for (int b = 0; b < numBands; b++)
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samples |= (iArray[inOffset+b] << bitOffsets[b]) & bitMasks[b];
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data.setElem(0, offset, samples);
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inOffset += numBands;
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offset += 1;
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}
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}
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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 offset = scanlineStride*y + x;
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int samples = data.getElem(offset);
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int bitMask = bitMasks[b];
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samples &= ~bitMask;
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samples |= (s << bitOffsets[b]) & bitMask;
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data.setElem(offset, samples);
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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
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* <code>SinglePixelPackedSampleModel</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>numBands</code>;
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* <li><code>scanlineStride</code>;
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* <li><code>bitMasks</code>;
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* <li><code>bitOffsets</code>.
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* </ul>
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* </li>
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* </ul>
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*
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* @param obj the object (<code>null</code> permitted)
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*
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* @return <code>true</code> if this model is equal to <code>obj</code>, and
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* <code>false</code> otherwise.
|
|
*/
|
|
public boolean equals(Object obj)
|
|
{
|
|
if (this == obj)
|
|
return true;
|
|
if (! (obj instanceof SinglePixelPackedSampleModel))
|
|
return false;
|
|
SinglePixelPackedSampleModel that = (SinglePixelPackedSampleModel) obj;
|
|
if (this.dataType != that.dataType)
|
|
return false;
|
|
if (this.width != that.width)
|
|
return false;
|
|
if (this.height != that.height)
|
|
return false;
|
|
if (this.numBands != that.numBands)
|
|
return false;
|
|
if (this.scanlineStride != that.scanlineStride)
|
|
return false;
|
|
if (!Arrays.equals(this.bitMasks, that.bitMasks))
|
|
return false;
|
|
if (!Arrays.equals(this.bitOffsets, that.bitOffsets))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
/**
|
|
* Returns a hash code for this <code>SinglePixelPackedSampleModel</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 + numBands;
|
|
result = 37 * result + scanlineStride;
|
|
for (int i = 0; i < bitMasks.length; i++)
|
|
result = 37 * result + bitMasks[i];
|
|
for (int i = 0; i < bitOffsets.length; i++)
|
|
result = 37 * result + bitOffsets[i];
|
|
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();
|
|
}
|
|
}
|