ej.fp.widget.display.buffer

Interface DisplayBufferPolicy

All Known Implementing Classes:

CopySwapBufferPolicy, DirectBufferPolicy, SingleBufferPolicy, SwapBufferPolicy, SwapDoubleBufferPolicy, SwapTripleBufferPolicy, TransmitSwapBufferPolicy

public interface DisplayBufferPolicy

The display buffer policy is responsible of managing the different buffers.

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.

Method Detail

setDisplayProperties

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

Sets the display properties.

Parameters:

displayWidget - the display widget.

width - the width of the display.

height - the height of the display

initialColor - the initial color of the display.

flush

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.

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).

Parameters:

bufferManager - the buffer manager.

rectangles - the modified rectangular regions.

getBufferCount

int getBufferCount()

Gets the number of buffers.

Returns:

the number of buffers.

isDoubleBuffered

boolean isDoubleBuffered()

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.

Returns:

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

getBackBuffer

ej.fp.Image getBackBuffer()

Gets the back buffer.

Returns:

the back buffer.

getFrontBuffer

ej.fp.Image getFrontBuffer()

Gets the front buffer.

Returns:

the front buffer.

dispose

void dispose()

Disposes the buffers.