protected class Component.BltBufferStrategy extends BufferStrategy
| Modifier and Type | Field and Description |
|---|---|
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
|
| Modifier | Constructor and Description |
|---|---|
protected |
BltBufferStrategy(int numBuffers,
BufferCapabilities caps)
Creates a new blt buffer strategy around a component
|
| Modifier and Type | Method and Description |
|---|---|
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()
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.
|
protected BufferCapabilities caps
protected VolatileImage[] backBuffers
protected boolean validatedContents
protected int width
protected int height
protected BltBufferStrategy(int numBuffers,
BufferCapabilities caps)
numBuffers - number of buffers to create, including the
front buffercaps - the capabilities of the bufferspublic void dispose()
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.dispose in class BufferStrategyWindow.createBufferStrategy(int),
Canvas.createBufferStrategy(int),
Window.getBufferStrategy(),
Canvas.getBufferStrategy()protected void createBackBuffers(int numBuffers)
public BufferCapabilities getCapabilities()
BufferStrategyBufferCapabilities for this
BufferStrategy.getCapabilities in class BufferStrategypublic Graphics getDrawGraphics()
BufferStrategygetDrawGraphics in class BufferStrategypublic void show()
show in class BufferStrategyprotected void revalidate()
public boolean contentsLost()
BufferStrategygetDrawGraphics. Since the buffers in a buffer strategy
are usually type VolatileImage, they may become lost.
For a discussion on lost buffers, see VolatileImage.contentsLost in class BufferStrategygetDrawGraphicsVolatileImagepublic boolean contentsRestored()
BufferStrategyVolatileImage, 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.contentsRestored in class BufferStrategyVolatileImage Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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