ej.fp.widget.display.buffer

Class SwapBufferPolicy

java.lang.Object

ej.fp.widget.display.buffer.SwapBufferPolicy

All Implemented Interfaces:

DisplayBufferPolicy

Direct Known Subclasses:

SwapDoubleBufferPolicy, SwapTripleBufferPolicy

public abstract class SwapBufferPolicy
extends java.lang.Object
implements DisplayBufferPolicy

Several buffers in RAM used alternatively for the display.

Constructor Summary

Constructors

Constructor and Description
SwapBufferPolicy(int bufferCount) Creates a swap buffer policy.

Method Summary

Modifier and Type	Method and Description
void	dispose() Disposes the buffers.
void	flush(DisplayBufferManager bufferManager, ej.microui.display.Rectangle[] rectangles) Performs a flush: the content of the back buffer has to be "transmitted" to the display front buffer.
ej.fp.Image	getBackBuffer() Gets the back buffer.
int	getBufferCount() Gets the number of buffers.
ej.fp.Image	getFrontBuffer() Gets the front buffer.
boolean	isDoubleBuffered() Gets whether or not there are several buffers for the display.
void	setDisplayProperties(ej.fp.Widget displayWidget, int width, int height, int initialColor) Sets the display properties.

Methods inherited from class java.lang.Object

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

Constructor Detail

SwapBufferPolicy

public SwapBufferPolicy(int bufferCount)

Creates a swap buffer policy.

Parameters:

bufferCount - the number of buffers.

Method Detail

setDisplayProperties

public void setDisplayProperties(ej.fp.Widget displayWidget,
                                 int width,
                                 int height,
                                 int initialColor)

Description copied from interface: DisplayBufferPolicy

Sets the display properties.

Specified by:

setDisplayProperties in interface DisplayBufferPolicy

Parameters:

displayWidget - the display widget.

width - the width of the display.

height - the height of the display

initialColor - the initial color of the display.

getBufferCount

public int getBufferCount()

Description copied from interface: DisplayBufferPolicy

Gets the number of buffers.

Specified by:

getBufferCount in interface DisplayBufferPolicy

Returns:

the number of buffers.

isDoubleBuffered

public boolean isDoubleBuffered()

Description copied from interface: DisplayBufferPolicy

Gets whether or not there are several buffers for the display.

In other words, if the drawings are done in a buffer different than the one used by the display or not.

Specified by:

isDoubleBuffered in interface DisplayBufferPolicy

Returns:

true if there is more than one buffer, false otherwise.

flush

public void flush(DisplayBufferManager bufferManager,
                  ej.microui.display.Rectangle[] rectangles)

Description copied from interface: DisplayBufferPolicy

Performs a flush: the content of the back buffer has to be "transmitted" to the display front buffer.

The content of given rectangles in the graphics buffer (back buffer) must be displayed into the LCD buffer (front buffer). The rectangles specified are the regions which have changed during last draw and only these regions should be updated (dirty regions). The number of rectangles depends on the display buffer refresh strategy (BRS).

Specified by:

flush in interface DisplayBufferPolicy

Parameters:

bufferManager - the buffer manager.

rectangles - the modified rectangular regions.

getBackBuffer

public ej.fp.Image getBackBuffer()

Description copied from interface: DisplayBufferPolicy

Gets the back buffer.

Specified by:

getBackBuffer in interface DisplayBufferPolicy

Returns:

the back buffer.

getFrontBuffer

public ej.fp.Image getFrontBuffer()

Description copied from interface: DisplayBufferPolicy

Gets the front buffer.

Specified by:

getFrontBuffer in interface DisplayBufferPolicy

Returns:

the front buffer.

dispose

public void dispose()

Description copied from interface: DisplayBufferPolicy

Disposes the buffers.

Specified by:

dispose in interface DisplayBufferPolicy