java.awt

Class Component.BltBufferStrategy

protected class Component.BltBufferStrategy extends BufferStrategy

This class provides support for blitting offscreen surfaces to a component.

Since: 1.4

See Also:

Field Summary
protected VolatileImage[]	backBuffers The back buffers used in this strategy.
protected BufferCapabilities	caps The capabilities of the image buffer.
protected int	height The height of the back buffers.
protected boolean	validatedContents Whether or not the image buffer resources are allocated and ready to be drawn into.
protected int	width The width of the back buffers.

Constructor Summary
protected	BltBufferStrategy(int numBuffers, BufferCapabilities caps) Creates a blitting buffer strategy.

Method Summary
boolean	contentsLost() Returns whether or not the image buffer resources have been lost.
boolean	contentsRestored() Returns whether or not the image buffer resources have been restored.
protected void	createBackBuffers(int numBuffers) Initializes the backBuffers field with an array of numBuffers VolatileImages.
BufferCapabilities	getCapabilities() Retrieves the capabilities of this buffer strategy.
Graphics	getDrawGraphics() Retrieves a graphics object that can be used to draw into this strategy's image buffer.
protected void	revalidate() Re-create the image buffer resources if they've been lost.
void	show() Bring the contents of the back buffer to the front buffer.

Field Detail

backBuffers

protected VolatileImage[] backBuffers

The back buffers used in this strategy.

caps

protected BufferCapabilities caps

The capabilities of the image buffer.

height

protected int height

The height of the back buffers.

validatedContents

protected boolean validatedContents

Whether or not the image buffer resources are allocated and ready to be drawn into.

width

protected int width

The width of the back buffers.

Constructor Detail

BltBufferStrategy

protected BltBufferStrategy(int numBuffers, BufferCapabilities caps)

Creates a blitting buffer strategy.

Parameters: numBuffers the number of buffers, including the front buffer caps the capabilities of this strategy

Method Detail

contentsLost

public boolean contentsLost()

Returns whether or not the image buffer resources have been lost.

Returns: true if the resources have been lost, false otherwise

contentsRestored

public boolean contentsRestored()

Returns whether or not the image buffer resources have been restored.

Returns: true if the resources have been restored, false otherwise

createBackBuffers

protected void createBackBuffers(int numBuffers)

Initializes the backBuffers field with an array of numBuffers VolatileImages.

Parameters: numBuffers the number of backbuffers to create

getCapabilities

public BufferCapabilities getCapabilities()

Retrieves the capabilities of this buffer strategy.

Returns: the capabilities of this buffer strategy

getDrawGraphics

public Graphics getDrawGraphics()

Retrieves a graphics object that can be used to draw into this strategy's image buffer.

Returns: a graphics object

revalidate

protected void revalidate()

Re-create the image buffer resources if they've been lost.

show

public void show()

Bring the contents of the back buffer to the front buffer.