+++ /dev/null
-/* Copyright (C) 2000, 2002 Free Software Foundation
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath is distributed in the hope that it will be useful, but
-WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
-General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
-02111-1307 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-package gnu.java.awt;
-
-import java.awt.image.*;
-
-/**
- * Utility class for creating and accessing data buffers of arbitrary
- * data types.
- */
-public final class Buffers
-{
- /**
- * Create a data buffer of a particular type.
- *
- * @param dataType the desired data type of the buffer.
- * @param data an array containing data, or null
- * @param size the size of the data buffer bank
- */
- public static DataBuffer createBuffer(int dataType, Object data,
- int size)
- {
- if (data == null) return createBuffer(dataType, size, 1);
-
- return createBufferFromData(dataType, data, size);
- }
-
-
- /**
- * Create a data buffer of a particular type.
- *
- * @param dataType the desired data type of the buffer.
- * @param size the size of the data buffer bank
- */
- public static DataBuffer createBuffer(int dataType, int size) {
- return createBuffer(dataType, size, 1);
- }
-
- /**
- * Create a data buffer of a particular type.
- *
- * @param dataType the desired data type of the buffer.
- * @param size the size of the data buffer bank
- * @param numBanks the number of banks the buffer should have
- */
- public static DataBuffer createBuffer(int dataType, int size, int numBanks)
- {
- switch (dataType)
- {
- case DataBuffer.TYPE_BYTE:
- return new DataBufferByte(size, numBanks);
- case DataBuffer.TYPE_USHORT:
- return new DataBufferUShort(size, numBanks);
- case DataBuffer.TYPE_INT:
- return new DataBufferInt(size, numBanks);
- default:
- throw new UnsupportedOperationException();
- }
- }
-
- /**
- * Create a data buffer of a particular type.
- *
- * @param dataType the desired data type of the buffer
- * @param data an array containing the data
- * @param size the size of the data buffer bank
- */
- public static DataBuffer createBufferFromData(int dataType, Object data,
- int size)
- {
- switch (dataType)
- {
- case DataBuffer.TYPE_BYTE:
- return new DataBufferByte((byte[]) data, size);
- case DataBuffer.TYPE_USHORT:
- return new DataBufferUShort((short[]) data, size);
- case DataBuffer.TYPE_INT:
- return new DataBufferInt((int[]) data, size);
- default:
- throw new UnsupportedOperationException();
- }
- }
-
- /**
- * Return the data array of a data buffer, regardless of the data
- * type.
- *
- * @return an array of primitive values. The actual array type
- * depends on the data type of the buffer.
- */
- public static Object getData(DataBuffer buffer)
- {
- if (buffer instanceof DataBufferByte)
- return ((DataBufferByte) buffer).getData();
- if (buffer instanceof DataBufferUShort)
- return ((DataBufferUShort) buffer).getData();
- if (buffer instanceof DataBufferInt)
- return ((DataBufferInt) buffer).getData();
- throw new ClassCastException("Unknown data buffer type");
- }
-
-
- /**
- * Copy data from array contained in data buffer, much like
- * System.arraycopy. Create a suitable destination array if the
- * given destination array is null.
- */
- public static Object getData(DataBuffer src, int srcOffset,
- Object dest, int destOffset,
- int length)
- {
- Object from;
- if (src instanceof DataBufferByte)
- {
- from = ((DataBufferByte) src).getData();
- if (dest == null) dest = new byte[length+destOffset];
- }
- else if (src instanceof DataBufferUShort)
- {
- from = ((DataBufferUShort) src).getData();
- if (dest == null) dest = new short[length+destOffset];
- }
- else if (src instanceof DataBufferInt)
- {
- from = ((DataBufferInt) src).getData();
- if (dest == null) dest = new int[length+destOffset];
- }
- else
- {
- throw new ClassCastException("Unknown data buffer type");
- }
-
- System.arraycopy(from, srcOffset, dest, destOffset, length);
- return dest;
- }
-
- /**
- * @param bits the width of a data element measured in bits
- *
- * @return the smallest data type that can store data elements of
- * the given number of bits, without any truncation.
- */
- public static int smallestAppropriateTransferType(int bits)
- {
- if (bits <= 8)
- {
- return DataBuffer.TYPE_BYTE;
- }
- else if (bits <= 16)
- {
- return DataBuffer.TYPE_USHORT;
- }
- else if (bits <= 32)
- {
- return DataBuffer.TYPE_INT;
- }
- else
- {
- return DataBuffer.TYPE_UNDEFINED;
- }
- }
-}
projects / msp430-gcc.git / blobdiff