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DataBufferByte.java
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286 lines (268 loc) · 10.3 KB
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/*
* Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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/* ****************************************************************
******************************************************************
******************************************************************
*** COPYRIGHT (c) Eastman Kodak Company, 1997
*** As an unpublished work pursuant to Title 17 of the United
*** States Code. All rights reserved.
******************************************************************
******************************************************************
******************************************************************/
package java.awt.image;
import static sun.java2d.StateTrackable.State.*;
/**
* This class extends <CODE>DataBuffer</CODE> and stores data internally as bytes.
* Values stored in the byte array(s) of this <CODE>DataBuffer</CODE> are treated as
* unsigned values.
* <p>
* <a name="optimizations">
* Note that some implementations may function more efficiently
* if they can maintain control over how the data for an image is
* stored.
* For example, optimizations such as caching an image in video
* memory require that the implementation track all modifications
* to that data.
* Other implementations may operate better if they can store the
* data in locations other than a Java array.
* To maintain optimum compatibility with various optimizations
* it is best to avoid constructors and methods which expose the
* underlying storage as a Java array, as noted below in the
* documentation for those methods.
* </a>
*/
public final class DataBufferByte extends DataBuffer
{
/** The default data bank. */
byte data[];
/** All data banks */
byte bankdata[][];
/**
* Constructs a byte-based <CODE>DataBuffer</CODE> with a single bank and the
* specified size.
*
* @param size The size of the <CODE>DataBuffer</CODE>.
*/
public DataBufferByte(int size) {
super(STABLE, TYPE_BYTE, size);
data = new byte[size];
bankdata = new byte[1][];
bankdata[0] = data;
}
/**
* Constructs a byte based <CODE>DataBuffer</CODE> with the specified number of
* banks all of which are the specified size.
*
* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
* @param numBanks The number of banks in the a<CODE>DataBuffer</CODE>.
*/
public DataBufferByte(int size, int numBanks) {
super(STABLE, TYPE_BYTE, size, numBanks);
bankdata = new byte[numBanks][];
for (int i= 0; i < numBanks; i++) {
bankdata[i] = new byte[size];
}
data = bankdata[0];
}
/**
* Constructs a byte-based <CODE>DataBuffer</CODE> with a single bank using the
* specified array.
* Only the first <CODE>size</CODE> elements should be used by accessors of
* this <CODE>DataBuffer</CODE>. <CODE>dataArray</CODE> must be large enough to
* hold <CODE>size</CODE> elements.
* <p>
* Note that {@code DataBuffer} objects created by this constructor
* may be incompatible with <a href="#optimizations">performance
* optimizations</a> used by some implementations (such as caching
* an associated image in video memory).
*
* @param dataArray The byte array for the <CODE>DataBuffer</CODE>.
* @param size The size of the <CODE>DataBuffer</CODE> bank.
*/
public DataBufferByte(byte dataArray[], int size) {
super(UNTRACKABLE, TYPE_BYTE, size);
data = dataArray;
bankdata = new byte[1][];
bankdata[0] = data;
}
/**
* Constructs a byte-based <CODE>DataBuffer</CODE> with a single bank using the
* specified array, size, and offset. <CODE>dataArray</CODE> must have at least
* <CODE>offset</CODE> + <CODE>size</CODE> elements. Only elements <CODE>offset</CODE>
* through <CODE>offset</CODE> + <CODE>size</CODE> - 1
* should be used by accessors of this <CODE>DataBuffer</CODE>.
* <p>
* Note that {@code DataBuffer} objects created by this constructor
* may be incompatible with <a href="#optimizations">performance
* optimizations</a> used by some implementations (such as caching
* an associated image in video memory).
*
* @param dataArray The byte array for the <CODE>DataBuffer</CODE>.
* @param size The size of the <CODE>DataBuffer</CODE> bank.
* @param offset The offset into the <CODE>dataArray</CODE>. <CODE>dataArray</CODE>
* must have at least <CODE>offset</CODE> + <CODE>size</CODE> elements.
*/
public DataBufferByte(byte dataArray[], int size, int offset){
super(UNTRACKABLE, TYPE_BYTE, size, 1, offset);
data = dataArray;
bankdata = new byte[1][];
bankdata[0] = data;
}
/**
* Constructs a byte-based <CODE>DataBuffer</CODE> with the specified arrays.
* The number of banks is equal to <CODE>dataArray.length</CODE>.
* Only the first <CODE>size</CODE> elements of each array should be used by
* accessors of this <CODE>DataBuffer</CODE>.
* <p>
* Note that {@code DataBuffer} objects created by this constructor
* may be incompatible with <a href="#optimizations">performance
* optimizations</a> used by some implementations (such as caching
* an associated image in video memory).
*
* @param dataArray The byte arrays for the <CODE>DataBuffer</CODE>.
* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
*/
public DataBufferByte(byte dataArray[][], int size) {
super(UNTRACKABLE, TYPE_BYTE, size, dataArray.length);
bankdata = (byte[][]) dataArray.clone();
data = bankdata[0];
}
/**
* Constructs a byte-based <CODE>DataBuffer</CODE> with the specified arrays, size,
* and offsets.
* The number of banks is equal to <CODE>dataArray.length</CODE>. Each array must
* be at least as large as <CODE>size</CODE> + the corresponding <CODE>offset</CODE>.
* There must be an entry in the <CODE>offset</CODE> array for each <CODE>dataArray</CODE>
* entry. For each bank, only elements <CODE>offset</CODE> through
* <CODE>offset</CODE> + <CODE>size</CODE> - 1 should be used by accessors of this
* <CODE>DataBuffer</CODE>.
* <p>
* Note that {@code DataBuffer} objects created by this constructor
* may be incompatible with <a href="#optimizations">performance
* optimizations</a> used by some implementations (such as caching
* an associated image in video memory).
*
* @param dataArray The byte arrays for the <CODE>DataBuffer</CODE>.
* @param size The size of the banks in the <CODE>DataBuffer</CODE>.
* @param offsets The offsets into each array.
*/
public DataBufferByte(byte dataArray[][], int size, int offsets[]) {
super(UNTRACKABLE, TYPE_BYTE, size, dataArray.length, offsets);
bankdata = (byte[][]) dataArray.clone();
data = bankdata[0];
}
/**
* Returns the default (first) byte data array.
* <p>
* Note that calling this method may cause this {@code DataBuffer}
* object to be incompatible with <a href="#optimizations">performance
* optimizations</a> used by some implementations (such as caching
* an associated image in video memory).
*
* @return The first byte data array.
*/
public byte[] getData() {
theTrackable.setUntrackable();
return data;
}
/**
* Returns the data array for the specified bank.
* <p>
* Note that calling this method may cause this {@code DataBuffer}
* object to be incompatible with <a href="#optimizations">performance
* optimizations</a> used by some implementations (such as caching
* an associated image in video memory).
*
* @param bank The bank whose data array you want to get.
* @return The data array for the specified bank.
*/
public byte[] getData(int bank) {
theTrackable.setUntrackable();
return bankdata[bank];
}
/**
* Returns the data arrays for all banks.
* <p>
* Note that calling this method may cause this {@code DataBuffer}
* object to be incompatible with <a href="#optimizations">performance
* optimizations</a> used by some implementations (such as caching
* an associated image in video memory).
*
* @return All of the data arrays.
*/
public byte[][] getBankData() {
theTrackable.setUntrackable();
return (byte[][]) bankdata.clone();
}
/**
* Returns the requested data array element from the first (default) bank.
*
* @param i The data array element you want to get.
* @return The requested data array element as an integer.
* @see #setElem(int, int)
* @see #setElem(int, int, int)
*/
public int getElem(int i) {
return (int)(data[i+offset]) & 0xff;
}
/**
* Returns the requested data array element from the specified bank.
*
* @param bank The bank from which you want to get a data array element.
* @param i The data array element you want to get.
* @return The requested data array element as an integer.
* @see #setElem(int, int)
* @see #setElem(int, int, int)
*/
public int getElem(int bank, int i) {
return (int)(bankdata[bank][i+offsets[bank]]) & 0xff;
}
/**
* Sets the requested data array element in the first (default) bank
* to the specified value.
*
* @param i The data array element you want to set.
* @param val The integer value to which you want to set the data array element.
* @see #getElem(int)
* @see #getElem(int, int)
*/
public void setElem(int i, int val) {
data[i+offset] = (byte)val;
theTrackable.markDirty();
}
/**
* Sets the requested data array element in the specified bank
* from the given integer.
* @param bank The bank in which you want to set the data array element.
* @param i The data array element you want to set.
* @param val The integer value to which you want to set the specified data array element.
* @see #getElem(int)
* @see #getElem(int, int)
*/
public void setElem(int bank, int i, int val) {
bankdata[bank][i+offsets[bank]] = (byte)val;
theTrackable.markDirty();
}
}