Class Component.BltBufferStrategy
java.lang.Object
java.awt.image.BufferStrategy
java.awt.Component.BltBufferStrategy
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Field Summary
Modifier and TypeFieldDescriptionprotected VolatileImage[]
The back buffersprotected BufferCapabilities
The buffering capabilitiesprotected int
Height of the back buffersprotected boolean
Whether or not the drawing buffer has been recently restored from a lost state.protected int
Width of the back buffers -
Constructor Summary
ModifierConstructorDescriptionprotected
BltBufferStrategy
(int numBuffers, BufferCapabilities caps) Creates a new blt buffer strategy around a component -
Method Summary
Modifier and TypeMethodDescriptionboolean
Returns whether the drawing buffer was lost since the last call togetDrawGraphics
.boolean
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 buffersvoid
dispose()
Releases system resources currently consumed by thisBufferStrategy
and removes it from the associated Component.Returns theBufferCapabilities
for thisBufferStrategy
.Creates a graphics context for the drawing buffer.protected void
Restore the drawing buffer if it has been lostvoid
show()
Makes the next available buffer visible.
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Field Details
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caps
The buffering capabilities -
backBuffers
The back buffers -
validatedContents
protected boolean validatedContentsWhether or not the drawing buffer has been recently restored from a lost state. -
width
protected int widthWidth of the back buffers -
height
protected int heightHeight of the back buffers
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Constructor Details
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BltBufferStrategy
Creates a new blt buffer strategy around a component- Parameters:
numBuffers
- number of buffers to create, including the front buffercaps
- the capabilities of the buffers
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Method Details
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dispose
public void dispose()Releases system resources currently consumed by thisBufferStrategy
and removes it from the associated Component. After invoking this method,getBufferStrategy
will return null. Trying to use aBufferStrategy
after it has been disposed will result in undefined behavior.- Overrides:
dispose
in classBufferStrategy
- Since:
- 1.6
- See Also:
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createBackBuffers
protected void createBackBuffers(int numBuffers) Creates the back buffers- Parameters:
numBuffers
- the number of buffers to create
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getCapabilities
Description copied from class:BufferStrategy
Returns theBufferCapabilities
for thisBufferStrategy
.- Specified by:
getCapabilities
in classBufferStrategy
- Returns:
- the buffering capabilities of this strategy
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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 classBufferStrategy
- Returns:
- the draw graphics
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show
public void show()Makes the next available buffer visible.- Specified by:
show
in classBufferStrategy
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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 togetDrawGraphics
. Since the buffers in a buffer strategy are usually typeVolatileImage
, they may become lost. For a discussion on lost buffers, seeVolatileImage
.- Specified by:
contentsLost
in classBufferStrategy
- Returns:
- whether the drawing buffer was lost since the last call to
getDrawGraphics
- See Also:
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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 typeVolatileImage
, they may become lost. If a surface has been recently restored from a lost state since the last call togetDrawGraphics
, it may require repainting. For a discussion on lost buffers, seeVolatileImage
.- Specified by:
contentsRestored
in classBufferStrategy
- Returns:
- whether the drawing buffer was recently restored from a lost state and reinitialized to the default background color (white)
- See Also:
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