com.sun.jimi.core.vmem
Class BytePageMapper

java.lang.Object
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  +--com.sun.jimi.core.vmem.PageMapper
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        +--com.sun.jimi.core.vmem.BytePageMapper

public class BytePageMapper

extends PageMapper

Page mapper extension mapping byte-based rectangle and pixel operations onto page-sized operations which are performed through page frames.

Field Summary

protected int	height logical dimensions
protected int	heightInPages dimensions measured in pages rather than pixels
protected BytePageFrame[]	pageFrames array of page frames
protected int	pageHeight individual page dimensions
protected int	pageWidth individual page dimensions
protected static int	SIZEOF_BYTE size in bytes of a java "byte"
protected int	width logical dimensions
protected int	widthInPages dimensions measured in pages rather than pixels

Fields inherited from class com.sun.jimi.core.vmem.PageMapper

input, logicalSize, numberOfPageFrames, output, pageDimensions, pageFaults, pageFrameMemory, storage

Constructor Summary

BytePageMapper(RandomAccessStorage storage, java.awt.Dimension logicalDimensions, int pageFrameMemory)
Create an page mapper with specified page frame size and count.

Method Summary

int	getLogicalPageNumberForLocation(int x, int y) Find out which logical page contains a given point.
java.awt.Dimension	getPageDimensions()
PageFrame[]	getPageFrames() Get the page frames being used for buffering.
int	getPageSize() Get the size in bytes of a page.
byte	getPixel(int x, int y) Get a pixel value at a specified logical location.
protected int	getPixelSize()
void	getRectangle(int x, int y, int width, int height, byte[] buffer, int offset, int scansize) Load a rectangular area of data into a memory buffer.
void	setPixel(int x, int y, byte value) Set a single value at a specified logical location.
void	setRectangle(int x, int y, int width, int height, byte[] buffer, int offset, int scansize) Load a rectangular area of data into a memory buffer.

Methods inherited from class com.sun.jimi.core.vmem.PageMapper

commitPage, configurePageFrames, getLogicalSize, getPageFrame, getPageFrameForReading, getPageFrameForWriting, howManyPageFaults, readPageIntoFrame, resetPageFaultCount

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

SIZEOF_BYTE

protected static final int SIZEOF_BYTE

size in bytes of a java "byte"

pageFrames

protected BytePageFrame[] pageFrames

array of page frames

width

protected int width

logical dimensions

height

protected int height

logical dimensions

pageWidth

protected int pageWidth

individual page dimensions

pageHeight

protected int pageHeight

individual page dimensions

widthInPages

protected int widthInPages

dimensions measured in pages rather than pixels

heightInPages

protected int heightInPages

dimensions measured in pages rather than pixels

Constructor Detail

BytePageMapper

public BytePageMapper(RandomAccessStorage storage,
                      java.awt.Dimension logicalDimensions,
                      int pageFrameMemory)

Create an page mapper with specified page frame size and count.

Parameters:

width - the width of the logical space

height - the height of the logical space

pageWidth - the width of each page frame

pageHeight - the height of each page frame

numberOfFrames - the number of page frames

Method Detail

getPixel

public byte getPixel(int x,
                     int y)
              throws java.io.IOException

Get a pixel value at a specified logical location.

Parameters:

x - the x-coordinate

y - the y-coordinate

setPixel

public void setPixel(int x,
                     int y,
                     byte value)
              throws java.io.IOException

Set a single value at a specified logical location.

Parameters:

x - the x-coordinate

y - the y-coordinate

value - the value for the location

getRectangle

public void getRectangle(int x,
                         int y,
                         int width,
                         int height,
                         byte[] buffer,
                         int offset,
                         int scansize)
                  throws java.io.IOException

Load a rectangular area of data into a memory buffer.

Parameters:

x - the logical x-coordinate

y - the logical y-coordinate

width - the logical width

height - the logical height

buffer - the buffer to copy into

offset - the index in the buffer to start copying at

setRectangle

public void setRectangle(int x,
                         int y,
                         int width,
                         int height,
                         byte[] buffer,
                         int offset,
                         int scansize)
                  throws java.io.IOException

Load a rectangular area of data into a memory buffer.

Parameters:

x - the logical x-coordinate

y - the logical y-coordinate

width - the logical width

height - the logical height

buffer - the buffer to copy into

offset - the index in the buffer to start copying at

getLogicalPageNumberForLocation

public int getLogicalPageNumberForLocation(int x,
                                           int y)

Find out which logical page contains a given point.

getPageSize

public int getPageSize()

Get the size in bytes of a page.

Returns:

the size

Overrides:

getPageSize in class PageMapper

getPixelSize

protected int getPixelSize()

Overrides:

getPixelSize in class PageMapper

getPageFrames

public PageFrame[] getPageFrames()

Get the page frames being used for buffering.

Returns:

the array of page frames

Overrides:

getPageFrames in class PageMapper

getPageDimensions

public java.awt.Dimension getPageDimensions()