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Tom Tromey
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libjava/classpath/gnu/java/awt/Buffers.java
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libjava/classpath/gnu/java/awt/Buffers.java
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/* Buffers.java --
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Copyright (C) 2000, 2002, 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 gnu.java.awt;
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import java.awt.image.DataBuffer;
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import java.awt.image.DataBufferByte;
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import java.awt.image.DataBufferDouble;
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import java.awt.image.DataBufferFloat;
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import java.awt.image.DataBufferInt;
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import java.awt.image.DataBufferShort;
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import java.awt.image.DataBufferUShort;
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/**
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* Utility class for creating and accessing data buffers of arbitrary
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* data types.
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*/
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public final class Buffers
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{
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/**
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* Create a data buffer of a particular type.
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*
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* @param dataType the desired data type of the buffer.
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* @param data an array containing data, or null
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* @param size the size of the data buffer bank
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*/
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public static DataBuffer createBuffer(int dataType, Object data,
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int size)
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{
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if (data == null) return createBuffer(dataType, size, 1);
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return createBufferFromData(dataType, data, size);
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}
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/**
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* Create a data buffer of a particular type.
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*
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* @param dataType the desired data type of the buffer.
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* @param size the size of the data buffer bank
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*/
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public static DataBuffer createBuffer(int dataType, int size) {
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return createBuffer(dataType, size, 1);
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}
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/**
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* Create a data buffer of a particular type.
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*
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* @param dataType the desired data type of the buffer.
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* @param size the size of the data buffer bank
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* @param numBanks the number of banks the buffer should have
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*/
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public static DataBuffer createBuffer(int dataType, int size, int numBanks)
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{
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switch (dataType)
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{
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case DataBuffer.TYPE_BYTE:
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return new DataBufferByte(size, numBanks);
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case DataBuffer.TYPE_SHORT:
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return new DataBufferShort(size, numBanks);
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case DataBuffer.TYPE_USHORT:
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return new DataBufferUShort(size, numBanks);
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case DataBuffer.TYPE_INT:
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return new DataBufferInt(size, numBanks);
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case DataBuffer.TYPE_FLOAT:
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return new DataBufferFloat(size, numBanks);
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case DataBuffer.TYPE_DOUBLE:
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return new DataBufferDouble(size, numBanks);
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default:
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throw new UnsupportedOperationException();
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}
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}
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/**
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* Create a data buffer of a particular type.
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*
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* @param dataType the desired data type of the buffer
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* @param data an array containing the data
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* @param size the size of the data buffer bank
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*/
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public static DataBuffer createBufferFromData(int dataType, Object data,
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int size)
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{
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switch (dataType)
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{
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case DataBuffer.TYPE_BYTE:
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return new DataBufferByte((byte[]) data, size);
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case DataBuffer.TYPE_SHORT:
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return new DataBufferShort((short[]) data, size);
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case DataBuffer.TYPE_USHORT:
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return new DataBufferUShort((short[]) data, size);
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case DataBuffer.TYPE_INT:
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return new DataBufferInt((int[]) data, size);
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case DataBuffer.TYPE_FLOAT:
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return new DataBufferFloat((float[]) data, size);
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case DataBuffer.TYPE_DOUBLE:
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return new DataBufferDouble((double[]) data, size);
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default:
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throw new UnsupportedOperationException();
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}
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}
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/**
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* Return the data array of a data buffer, regardless of the data
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* type.
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*
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* @return an array of primitive values. The actual array type
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* depends on the data type of the buffer.
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*/
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public static Object getData(DataBuffer buffer)
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{
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if (buffer instanceof DataBufferByte)
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return ((DataBufferByte) buffer).getData();
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if (buffer instanceof DataBufferShort)
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return ((DataBufferShort) buffer).getData();
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if (buffer instanceof DataBufferUShort)
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return ((DataBufferUShort) buffer).getData();
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if (buffer instanceof DataBufferInt)
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return ((DataBufferInt) buffer).getData();
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if (buffer instanceof DataBufferFloat)
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return ((DataBufferFloat) buffer).getData();
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if (buffer instanceof DataBufferDouble)
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return ((DataBufferDouble) buffer).getData();
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throw new ClassCastException("Unknown data buffer type");
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}
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/**
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* Copy data from array contained in data buffer, much like
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* System.arraycopy. Create a suitable destination array if the
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* given destination array is null.
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*/
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public static Object getData(DataBuffer src, int srcOffset,
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Object dest, int destOffset,
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int length)
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{
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Object from;
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if (src instanceof DataBufferByte)
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{
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from = ((DataBufferByte) src).getData();
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if (dest == null) dest = new byte[length+destOffset];
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}
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else if (src instanceof DataBufferShort)
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{
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from = ((DataBufferShort) src).getData();
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if (dest == null) dest = new short[length+destOffset];
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}
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else if (src instanceof DataBufferUShort)
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{
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from = ((DataBufferUShort) src).getData();
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if (dest == null) dest = new short[length+destOffset];
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}
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else if (src instanceof DataBufferInt)
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{
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from = ((DataBufferInt) src).getData();
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if (dest == null) dest = new int[length+destOffset];
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}
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else if (src instanceof DataBufferFloat)
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{
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from = ((DataBufferFloat) src).getData();
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if (dest == null) dest = new float[length+destOffset];
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}
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else if (src instanceof DataBufferDouble)
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{
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from = ((DataBufferDouble) src).getData();
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if (dest == null) dest = new double[length+destOffset];
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}
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else
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{
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throw new ClassCastException("Unknown data buffer type");
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}
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System.arraycopy(from, srcOffset, dest, destOffset, length);
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return dest;
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}
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/**
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* @param bits the width of a data element measured in bits
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*
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* @return the smallest data type that can store data elements of
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* the given number of bits, without any truncation.
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*/
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public static int smallestAppropriateTransferType(int bits)
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{
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if (bits <= 8)
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{
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return DataBuffer.TYPE_BYTE;
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}
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else if (bits <= 16)
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{
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return DataBuffer.TYPE_USHORT;
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}
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else if (bits <= 32)
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{
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return DataBuffer.TYPE_INT;
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}
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else
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{
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return DataBuffer.TYPE_UNDEFINED;
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}
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}
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}
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