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author | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
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committer | upstream source tree <ports@midipix.org> | 2015-03-15 20:14:05 -0400 |
commit | 554fd8c5195424bdbcabf5de30fdc183aba391bd (patch) | |
tree | 976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/java/awt/image/DataBuffer.java | |
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Diffstat (limited to 'libjava/classpath/java/awt/image/DataBuffer.java')
-rw-r--r-- | libjava/classpath/java/awt/image/DataBuffer.java | 437 |
1 files changed, 437 insertions, 0 deletions
diff --git a/libjava/classpath/java/awt/image/DataBuffer.java b/libjava/classpath/java/awt/image/DataBuffer.java new file mode 100644 index 000000000..78bc75ba5 --- /dev/null +++ b/libjava/classpath/java/awt/image/DataBuffer.java @@ -0,0 +1,437 @@ +/* Copyright (C) 2000, 2002, 2005 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., 51 Franklin Street, Fifth Floor, Boston, MA +02110-1301 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 java.awt.image; + +/** + * Class that manages arrays of data elements. A data buffer consists + * of one or more banks. A bank is a continuous region of data + * elements. + * + * @author Rolf W. Rasmussen (rolfwr@ii.uib.no) + */ +public abstract class DataBuffer +{ + /** + * A constant representing a data type that uses <code>byte</code> primitives + * as the storage unit. + */ + public static final int TYPE_BYTE = 0; + + /** + * A constant representing a data type that uses <code>short</code> + * primitives as the storage unit. + */ + public static final int TYPE_USHORT = 1; + + /** + * A constant representing a data type that uses <code>short</code> + * primitives as the storage unit. + */ + public static final int TYPE_SHORT = 2; + + /** + * A constant representing a data type that uses <code>int</code> + * primitives as the storage unit. + */ + public static final int TYPE_INT = 3; + + /** + * A constant representing a data type that uses <code>float</code> + * primitives as the storage unit. + */ + public static final int TYPE_FLOAT = 4; + + /** + * A constant representing a data type that uses <code>double</code> + * primitives as the storage unit. + */ + public static final int TYPE_DOUBLE = 5; + + /** + * A constant representing an undefined data type. + */ + public static final int TYPE_UNDEFINED = 32; + + /** The type of the data elements stored in the data buffer. */ + protected int dataType; + + /** The number of banks in this buffer. */ + protected int banks = 1; + + /** Offset into the default (0'th) bank). */ + protected int offset; // FIXME: Is offsets[0] always mirrored in offset? + + /** The size of the banks. */ + protected int size; + + /** Offset into each bank. */ + protected int[] offsets; + + /** + * Creates a new <code>DataBuffer</code> with the specified data type and + * size. The <code>dataType</code> should be one of the constants + * {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, {@link #TYPE_USHORT}, + * {@link #TYPE_INT}, {@link #TYPE_FLOAT} and {@link #TYPE_DOUBLE}. + * <p> + * The physical (array-based) storage is allocated by a subclass. + * + * @param dataType the data type. + * @param size the number of elements in the buffer. + */ + protected DataBuffer(int dataType, int size) + { + this(dataType, size, 1); + } + + /** + * Creates a new <code>DataBuffer</code> with the specified data type, + * size and number of banks. The <code>dataType</code> should be one of + * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, + * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and + * {@link #TYPE_DOUBLE}. + * <p> + * The physical (array-based) storage is allocated by a subclass. + * + * @param dataType the data type. + * @param size the number of elements in the buffer. + * @param numBanks the number of data banks. + */ + protected DataBuffer(int dataType, int size, int numBanks) { + this(dataType, size, numBanks, 0); + } + + /** + * Creates a new <code>DataBuffer</code> with the specified data type, + * size and number of banks. An offset (which applies to all banks) is + * also specified. The <code>dataType</code> should be one of + * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, + * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and + * {@link #TYPE_DOUBLE}. + * <p> + * The physical (array-based) storage is allocated by a subclass. + * + * @param dataType the data type. + * @param size the number of elements in the buffer. + * @param numBanks the number of data banks. + * @param offset the offset to the first element for all banks. + */ + protected DataBuffer(int dataType, int size, int numBanks, int offset) { + banks = numBanks; + this.dataType = dataType; + this.size = size; + this.offset = offset; + + offsets = new int[ numBanks ]; + for(int i = 0; i < numBanks; i++ ) + offsets[i] = offset; + } + + /** + * Creates a new <code>DataBuffer</code> with the specified data type, + * size and number of banks. An offset (which applies to all banks) is + * also specified. The <code>dataType</code> should be one of + * the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, + * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and + * {@link #TYPE_DOUBLE}. + * <p> + * The physical (array-based) storage is allocated by a subclass. + * + * @param dataType the data type. + * @param size the number of elements in the buffer. + * @param numBanks the number of data banks. + * @param offsets the offsets to the first element for all banks. + * + * @throws ArrayIndexOutOfBoundsException if + * <code>numBanks != offsets.length</code>. + */ + protected DataBuffer(int dataType, int size, int numBanks, int[] offsets) { + if (numBanks != offsets.length) + throw new ArrayIndexOutOfBoundsException(); + + this.dataType = dataType; + this.size = size; + banks = numBanks; + this.offsets = offsets; + + offset = offsets[0]; + } + + /** + * Returns the size (number of bits) of the specified data type. Valid types + * are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, + * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and + * {@link #TYPE_DOUBLE}. + * + * @param dataType the data type. + * @return The number of bits for the specified data type. + * @throws IllegalArgumentException if <code>dataType < 0</code> or + * <code>dataType > TYPE_DOUBLE</code>. + */ + public static int getDataTypeSize(int dataType) { + // Maybe this should be a lookup table instead. + switch (dataType) + { + case TYPE_BYTE: + return 8; + case TYPE_USHORT: + case TYPE_SHORT: + return 16; + case TYPE_INT: + case TYPE_FLOAT: + return 32; + case TYPE_DOUBLE: + return 64; + default: + throw new IllegalArgumentException(); + } + } + + /** + * Returns the type of the data elements in the data buffer. Valid types + * are defined by the constants {@link #TYPE_BYTE}, {@link #TYPE_SHORT}, + * {@link #TYPE_USHORT}, {@link #TYPE_INT}, {@link #TYPE_FLOAT} and + * {@link #TYPE_DOUBLE}. + * + * @return The type. + */ + public int getDataType() + { + return dataType; + } + + /** + * Returns the size of the data buffer. + * + * @return The size. + */ + public int getSize() + { + return size; + } + + /** + * Returns the element offset for the first data bank. + * + * @return The element offset. + */ + public int getOffset() + { + return offset; + } + + /** + * Returns the offsets for all the data banks used by this + * <code>DataBuffer</code>. + * + * @return The offsets. + */ + public int[] getOffsets() + { + if (offsets == null) + { + // is this necessary? + offsets = new int[1]; + offsets[0] = offset; + } + return offsets; + } + + /** + * Returns the number of data banks for this <code>DataBuffer</code>. + * @return The number of data banks. + */ + public int getNumBanks() + { + return banks; + } + + /** + * Returns an element from the first data bank. The offset (specified in + * the constructor) is added to <code>i</code> before accessing the + * underlying data array. + * + * @param i the element index. + * @return The element. + */ + public int getElem(int i) + { + return getElem(0, i); + } + + /** + * Returns an element from a particular data bank. The offset (specified in + * the constructor) is added to <code>i</code> before accessing the + * underlying data array. + * + * @param bank the bank index. + * @param i the element index. + * @return The element. + */ + public abstract int getElem(int bank, int i); + + /** + * Sets an element in the first data bank. The offset (specified in the + * constructor) is added to <code>i</code> before updating the underlying + * data array. + * + * @param i the element index. + * @param val the new element value. + */ + public void setElem(int i, int val) + { + setElem(0, i, val); + } + + /** + * Sets an element in a particular data bank. The offset (specified in the + * constructor) is added to <code>i</code> before updating the underlying + * data array. + * + * @param bank the data bank index. + * @param i the element index. + * @param val the new element value. + */ + public abstract void setElem(int bank, int i, int val); + + /** + * Returns an element from the first data bank, converted to a + * <code>float</code>. The offset (specified in the constructor) is added + * to <code>i</code> before accessing the underlying data array. + * + * @param i the element index. + * @return The element. + */ + public float getElemFloat(int i) + { + return getElem(i); + } + + /** + * Returns an element from a particular data bank, converted to a + * <code>float</code>. The offset (specified in the constructor) is + * added to <code>i</code> before accessing the underlying data array. + * + * @param bank the bank index. + * @param i the element index. + * @return The element. + */ + public float getElemFloat(int bank, int i) + { + return getElem(bank, i); + } + + /** + * Sets an element in the first data bank. The offset (specified in the + * constructor) is added to <code>i</code> before updating the underlying + * data array. + * + * @param i the element index. + * @param val the new element value. + */ + public void setElemFloat(int i, float val) + { + setElem(i, (int) val); + } + + /** + * Sets an element in a particular data bank. The offset (specified in the + * constructor) is added to <code>i</code> before updating the underlying + * data array. + * + * @param bank the data bank index. + * @param i the element index. + * @param val the new element value. + */ + public void setElemFloat(int bank, int i, float val) + { + setElem(bank, i, (int) val); + } + + /** + * Returns an element from the first data bank, converted to a + * <code>double</code>. The offset (specified in the constructor) is added + * to <code>i</code> before accessing the underlying data array. + * + * @param i the element index. + * @return The element. + */ + public double getElemDouble(int i) + { + return getElem(i); + } + + /** + * Returns an element from a particular data bank, converted to a + * <code>double</code>. The offset (specified in the constructor) is + * added to <code>i</code> before accessing the underlying data array. + * + * @param bank the bank index. + * @param i the element index. + * @return The element. + */ + public double getElemDouble(int bank, int i) + { + return getElem(bank, i); + } + + /** + * Sets an element in the first data bank. The offset (specified in the + * constructor) is added to <code>i</code> before updating the underlying + * data array. + * + * @param i the element index. + * @param val the new element value. + */ + public void setElemDouble(int i, double val) + { + setElem(i, (int) val); + } + + /** + * Sets an element in a particular data bank. The offset (specified in the + * constructor) is added to <code>i</code> before updating the underlying + * data array. + * + * @param bank the data bank index. + * @param i the element index. + * @param val the new element value. + */ + public void setElemDouble(int bank, int i, double val) + { + setElem(bank, i, (int) val); + } +} |