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java.awt
Class Component.BltBufferStrategy
java.lang.Object
java.awt.image.BufferStrategy
java.awt.Component.BltBufferStrategy
-
Enclosing class:
-
Component
-
protected class Component.BltBufferStrategy
- extends BufferStrategy
Inner class for blitting offscreen surfaces to a component.
-
Since:
-
1.4
Field Summary
|
protected
VolatileImage
[] |
backBuffers
The back buffers |
protected
BufferCapabilities
|
caps
The buffering capabilities |
protected int |
height
|
protected boolean |
validatedContents
Whether or not the drawing buffer has been recently restored from a lost state. |
protected int |
width
Size of the back buffers |
Constructor Summary
|
protected |
Component.BltBufferStrategy
(int numBuffers,
BufferCapabilities
caps)
Creates a new blt buffer strategy around a component |
Method Summary
|
boolean |
contentsLost
()
Returns whether the drawing buffer was lost since the last call to getDrawGraphics. |
boolean |
contentsRestored
()
Returns whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white). |
protected void |
createBackBuffers
(int numBuffers)
Creates the back buffers |
void
|
dispose
()
Releases system resources currently consumed by this BufferStrategy and removes it from the associated Component.
|
BufferCapabilities
|
getCapabilities
()
|
BufferCapabilities
Graphics
|
getCapabilities
getDrawGraphics
()
Returns the BufferCapabilities for this BufferStrategy.
|
Graphics
|
getDrawGraphics
()
Creates a graphics context for the drawing buffer.
|
protected void |
revalidate
()
Restore the drawing buffer if it has been lost |
void |
show
()
Makes the next available buffer visible. |
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
toString
,
wait
,
wait
,
wait
|
caps
protected BufferCapabilities caps
-
The buffering capabilities
backBuffers
protected VolatileImage[] backBuffers
-
The back buffers
validatedContents
protected boolean validatedContents
-
Whether or not the drawing buffer has been recently restored from a lost state.
width
protected int width
-
Size of the back buffers
height
protected int height
Component.BltBufferStrategy
protected Component.BltBufferStrategy(int numBuffers,
BufferCapabilities caps)
-
Creates a new blt buffer strategy around a component
-
Parameters:
-
numBuffers -
number of buffers
the component
to
create, including
use as
the front buffer -
caps - the capabilities of the buffers
dispose
public void
dispose
()
-
Releases system resources currently consumed by this BufferStrategy and removes it from the associated Component. After invoking this method, getBufferStrategy will return null. Trying to use a BufferStrategy after it has been disposed will result in undefined behavior.
-
-
Overrides:
-
dispose
in class
BufferStrategy
-
-
Since:
-
1.6
-
See Also:
-
Component#createBufferStrategy, Component#getBufferStrategy
createBackBuffers
protected void createBackBuffers(int numBuffers)
-
Creates the back buffers
-
getCapabilities
public BufferCapabilities getCapabilities()
-
Description copied from class:
BufferStrategy
-
Returns the BufferCapabilities for this BufferStrategy.
-
-
Specified by:
-
getCapabilities
in class
BufferStrategy
-
-
Returns:
-
the buffering capabilities of this strategy
getDrawGraphics
public Graphics getDrawGraphics()
-
Description copied from class:
BufferStrategy
-
Creates a graphics context for the drawing buffer. This method may not be synchronized for performance reasons; use of this method by multiple threads should be handled at the application level. Disposal of the graphics object obtained must be handled by the application.
-
-
Specified by:
-
getDrawGraphics
in class
BufferStrategy
-
-
Returns:
-
the draw graphics
show
public void show()
-
Makes the next available buffer visible.
-
-
Specified by:
-
show
in class
BufferStrategy
-
revalidate
protected void revalidate()
-
Restore the drawing buffer if it has been lost
-
contentsLost
public boolean contentsLost()
-
Description copied from class:
BufferStrategy
-
Returns whether the drawing buffer was lost since the last call to getDrawGraphics. Since the buffers in a buffer strategy are usually type VolatileImage, they may become lost. For a discussion on lost buffers, see VolatileImage.
-
-
Specified by:
-
contentsLost
in class
BufferStrategy
-
-
Returns:
-
whether the drawing buffer was lost since the last call to getDrawGraphics
-
See Also:
-
VolatileImage
contentsRestored
public boolean contentsRestored()
-
Description copied from class:
BufferStrategy
-
Returns whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white). Since the buffers in a buffer strategy are usually type VolatileImage, they may become lost. If a surface has been recently restored from a lost state since the last call to getDrawGraphics, it may require repainting. For a discussion on lost buffers, see VolatileImage.
-
-
Specified by:
-
contentsRestored
in class
BufferStrategy
-
-
Returns:
-
whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white)
-
See Also:
-
VolatileImage