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287 lines
10 KiB
287 lines
10 KiB
/*
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* Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
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* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*
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*/
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/* ****************************************************************
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******************************************************************
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******************************************************************
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*** COPYRIGHT (c) Eastman Kodak Company, 1997
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*** As an unpublished work pursuant to Title 17 of the United
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*** States Code. All rights reserved.
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******************************************************************
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******************************************************************
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******************************************************************/
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package java.awt.image;
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import static sun.java2d.StateTrackable.State.*;
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/**
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* This class extends <CODE>DataBuffer</CODE> and stores data internally as bytes.
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* Values stored in the byte array(s) of this <CODE>DataBuffer</CODE> are treated as
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* unsigned values.
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* <p>
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* <a name="optimizations">
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* Note that some implementations may function more efficiently
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* if they can maintain control over how the data for an image is
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* stored.
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* For example, optimizations such as caching an image in video
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* memory require that the implementation track all modifications
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* to that data.
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* Other implementations may operate better if they can store the
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* data in locations other than a Java array.
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* To maintain optimum compatibility with various optimizations
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* it is best to avoid constructors and methods which expose the
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* underlying storage as a Java array, as noted below in the
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* documentation for those methods.
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* </a>
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*/
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public final class DataBufferByte extends DataBuffer
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{
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/** The default data bank. */
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byte data[];
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/** All data banks */
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byte bankdata[][];
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/**
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* Constructs a byte-based <CODE>DataBuffer</CODE> with a single bank and the
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* specified size.
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*
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* @param size The size of the <CODE>DataBuffer</CODE>.
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*/
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public DataBufferByte(int size) {
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super(STABLE, TYPE_BYTE, size);
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data = new byte[size];
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bankdata = new byte[1][];
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bankdata[0] = data;
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}
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/**
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* Constructs a byte based <CODE>DataBuffer</CODE> with the specified number of
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* banks all of which are the specified size.
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*
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* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
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* @param numBanks The number of banks in the a<CODE>DataBuffer</CODE>.
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*/
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public DataBufferByte(int size, int numBanks) {
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super(STABLE, TYPE_BYTE, size, numBanks);
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bankdata = new byte[numBanks][];
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for (int i= 0; i < numBanks; i++) {
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bankdata[i] = new byte[size];
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}
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data = bankdata[0];
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}
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/**
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* Constructs a byte-based <CODE>DataBuffer</CODE> with a single bank using the
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* specified array.
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* Only the first <CODE>size</CODE> elements should be used by accessors of
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* this <CODE>DataBuffer</CODE>. <CODE>dataArray</CODE> must be large enough to
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* hold <CODE>size</CODE> elements.
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* <p>
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* Note that {@code DataBuffer} objects created by this constructor
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* may be incompatible with <a href="#optimizations">performance
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* optimizations</a> used by some implementations (such as caching
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* an associated image in video memory).
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*
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* @param dataArray The byte array for the <CODE>DataBuffer</CODE>.
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* @param size The size of the <CODE>DataBuffer</CODE> bank.
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*/
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public DataBufferByte(byte dataArray[], int size) {
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super(UNTRACKABLE, TYPE_BYTE, size);
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data = dataArray;
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bankdata = new byte[1][];
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bankdata[0] = data;
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}
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/**
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* Constructs a byte-based <CODE>DataBuffer</CODE> with a single bank using the
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* specified array, size, and offset. <CODE>dataArray</CODE> must have at least
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* <CODE>offset</CODE> + <CODE>size</CODE> elements. Only elements <CODE>offset</CODE>
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* through <CODE>offset</CODE> + <CODE>size</CODE> - 1
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* should be used by accessors of this <CODE>DataBuffer</CODE>.
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* <p>
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* Note that {@code DataBuffer} objects created by this constructor
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* may be incompatible with <a href="#optimizations">performance
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* optimizations</a> used by some implementations (such as caching
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* an associated image in video memory).
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*
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* @param dataArray The byte array for the <CODE>DataBuffer</CODE>.
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* @param size The size of the <CODE>DataBuffer</CODE> bank.
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* @param offset The offset into the <CODE>dataArray</CODE>. <CODE>dataArray</CODE>
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* must have at least <CODE>offset</CODE> + <CODE>size</CODE> elements.
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*/
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public DataBufferByte(byte dataArray[], int size, int offset){
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super(UNTRACKABLE, TYPE_BYTE, size, 1, offset);
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data = dataArray;
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bankdata = new byte[1][];
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bankdata[0] = data;
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}
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/**
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* Constructs a byte-based <CODE>DataBuffer</CODE> with the specified arrays.
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* The number of banks is equal to <CODE>dataArray.length</CODE>.
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* Only the first <CODE>size</CODE> elements of each array should be used by
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* accessors of this <CODE>DataBuffer</CODE>.
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* <p>
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* Note that {@code DataBuffer} objects created by this constructor
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* may be incompatible with <a href="#optimizations">performance
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* optimizations</a> used by some implementations (such as caching
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* an associated image in video memory).
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*
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* @param dataArray The byte arrays for the <CODE>DataBuffer</CODE>.
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* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
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*/
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public DataBufferByte(byte dataArray[][], int size) {
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super(UNTRACKABLE, TYPE_BYTE, size, dataArray.length);
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bankdata = (byte[][]) dataArray.clone();
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data = bankdata[0];
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}
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/**
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* Constructs a byte-based <CODE>DataBuffer</CODE> with the specified arrays, size,
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* and offsets.
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* The number of banks is equal to <CODE>dataArray.length</CODE>. Each array must
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* be at least as large as <CODE>size</CODE> + the corresponding <CODE>offset</CODE>.
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* There must be an entry in the <CODE>offset</CODE> array for each <CODE>dataArray</CODE>
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* entry. For each bank, only elements <CODE>offset</CODE> through
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* <CODE>offset</CODE> + <CODE>size</CODE> - 1 should be used by accessors of this
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* <CODE>DataBuffer</CODE>.
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* <p>
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* Note that {@code DataBuffer} objects created by this constructor
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* may be incompatible with <a href="#optimizations">performance
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* optimizations</a> used by some implementations (such as caching
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* an associated image in video memory).
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*
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* @param dataArray The byte arrays for the <CODE>DataBuffer</CODE>.
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* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
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* @param offsets The offsets into each array.
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*/
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public DataBufferByte(byte dataArray[][], int size, int offsets[]) {
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super(UNTRACKABLE, TYPE_BYTE, size, dataArray.length, offsets);
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bankdata = (byte[][]) dataArray.clone();
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data = bankdata[0];
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}
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/**
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* Returns the default (first) byte data array.
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* <p>
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* Note that calling this method may cause this {@code DataBuffer}
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* object to be incompatible with <a href="#optimizations">performance
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* optimizations</a> used by some implementations (such as caching
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* an associated image in video memory).
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*
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* @return The first byte data array.
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*/
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public byte[] getData() {
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theTrackable.setUntrackable();
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return data;
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}
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/**
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* Returns the data array for the specified bank.
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* <p>
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* Note that calling this method may cause this {@code DataBuffer}
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* object to be incompatible with <a href="#optimizations">performance
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* optimizations</a> used by some implementations (such as caching
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* an associated image in video memory).
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*
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* @param bank The bank whose data array you want to get.
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* @return The data array for the specified bank.
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*/
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public byte[] getData(int bank) {
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theTrackable.setUntrackable();
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return bankdata[bank];
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}
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/**
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* Returns the data arrays for all banks.
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* <p>
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* Note that calling this method may cause this {@code DataBuffer}
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* object to be incompatible with <a href="#optimizations">performance
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* optimizations</a> used by some implementations (such as caching
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* an associated image in video memory).
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*
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* @return All of the data arrays.
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*/
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public byte[][] getBankData() {
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theTrackable.setUntrackable();
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return (byte[][]) bankdata.clone();
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}
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/**
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* Returns the requested data array element from the first (default) bank.
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*
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* @param i The data array element you want to get.
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* @return The requested data array element as an integer.
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* @see #setElem(int, int)
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* @see #setElem(int, int, int)
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*/
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public int getElem(int i) {
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return (int)(data[i+offset]) & 0xff;
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}
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/**
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* Returns the requested data array element from the specified bank.
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*
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* @param bank The bank from which you want to get a data array element.
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* @param i The data array element you want to get.
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* @return The requested data array element as an integer.
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* @see #setElem(int, int)
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* @see #setElem(int, int, int)
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*/
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public int getElem(int bank, int i) {
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return (int)(bankdata[bank][i+offsets[bank]]) & 0xff;
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}
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/**
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* Sets the requested data array element in the first (default) bank
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* to the specified value.
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*
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* @param i The data array element you want to set.
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* @param val The integer value to which you want to set the data array element.
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* @see #getElem(int)
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* @see #getElem(int, int)
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*/
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public void setElem(int i, int val) {
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data[i+offset] = (byte)val;
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theTrackable.markDirty();
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}
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/**
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* Sets the requested data array element in the specified bank
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* from the given integer.
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* @param bank The bank in which you want to set the data array element.
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* @param i The data array element you want to set.
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* @param val The integer value to which you want to set the specified data array element.
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* @see #getElem(int)
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* @see #getElem(int, int)
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*/
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public void setElem(int bank, int i, int val) {
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bankdata[bank][i+offsets[bank]] = (byte)val;
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theTrackable.markDirty();
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}
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}
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