java.awt
Class BufferCapabilities

java.lang.Object
  |
  +--java.awt.BufferCapabilities

All Implemented Interfaces:

Cloneable

public class BufferCapabilities

extends Object

implements Cloneable

Capabilities and properties of buffers.

Since:

1.4

See Also:

BufferStrategy#getCapabilities, GraphicsConfiguration#getCapabilities

Nested Class Summary

static class

BufferCapabilities.FlipContents A type-safe enumeration of the possible back buffer contents after page-flipping

Constructor Summary

BufferCapabilities(ImageCapabilities frontCaps, ImageCapabilities backCaps, BufferCapabilities.FlipContents flipContents)
Creates a new object for specifying buffering capabilities

Method Summary

Object	clone() Creates and returns a copy of this object.
ImageCapabilities	getBackBufferCapabilities()
BufferCapabilities.FlipContents	getFlipContents()
ImageCapabilities	getFrontBufferCapabilities()
boolean	isFullScreenRequired()
boolean	isMultiBufferAvailable()
boolean	isPageFlipping()

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

BufferCapabilities

public BufferCapabilities(ImageCapabilities frontCaps,
                          ImageCapabilities backCaps,
                          BufferCapabilities.FlipContents flipContents)

Creates a new object for specifying buffering capabilities

Parameters:

frontCaps - the capabilities of the front buffer; cannot be null

backCaps - the capabilities of the back and intermediate buffers; cannot be null

flipContents - the contents of the back buffer after page-flipping, null if page flipping is not used (implies blitting)

Throws:

IllegalArgumentException - if frontCaps or backCaps are null

Method Detail

getFrontBufferCapabilities

public ImageCapabilities getFrontBufferCapabilities()

Returns:

the image capabilities of the front (displayed) buffer

getBackBufferCapabilities

public ImageCapabilities getBackBufferCapabilities()

Returns:

the image capabilities of all back buffers (intermediate buffers are considered back buffers)

isPageFlipping

public boolean isPageFlipping()

Returns:

whether or not the buffer strategy uses page flipping; a set of buffers that uses page flipping can swap the contents internally between the front buffer and one or more back buffers by switching the video pointer (or by copying memory internally). A non-flipping set of buffers uses blitting to copy the contents from one buffer to another; when this is the case, getFlipContents returns null

getFlipContents

public BufferCapabilities.FlipContents getFlipContents()

Returns:

the resulting contents of the back buffer after page-flipping. This value is null when the isPageFlipping returns false, implying blitting. It can be one of FlipContents.UNDEFINED (the assumed default), FlipContents.BACKGROUND, FlipContents.PRIOR, or FlipContents.COPIED.

See Also:

isPageFlipping(), #UNDEFINED, #BACKGROUND, #PRIOR, #COPIED

isFullScreenRequired

public boolean isFullScreenRequired()

Returns:

whether page flipping is only available in full-screen mode. If this is true, full-screen exclusive mode is required for page-flipping.

See Also:

isPageFlipping(), GraphicsDevice.setFullScreenWindow(java.awt.Window)

isMultiBufferAvailable

public boolean isMultiBufferAvailable()

Returns:

whether or not page flipping can be performed using more than two buffers (one or more intermediate buffers as well as the front and back buffer).

See Also:

isPageFlipping()

clone

public Object clone()

Description copied from class: Object

Creates and returns a copy of this object. The precise meaning of "copy" may depend on the class of the object. The general intent is that, for any object x, the expression:

 x.clone() != x

will be true, and that the expression:

 x.clone().getClass() == x.getClass()

will be true, but these are not absolute requirements. While it is typically the case that:

 x.clone().equals(x)

will be true, this is not an absolute requirement. Copying an object will typically entail creating a new instance of its class, but it also may require copying of internal data structures as well. No constructors are called.

The method clone for class Object performs a specific cloning operation. First, if the class of this object does not implement the interface Cloneable, then a CloneNotSupportedException is thrown. Note that all arrays are considered to implement the interface Cloneable. Otherwise, this method creates a new instance of the class of this object and initializes all its fields with exactly the contents of the corresponding fields of this object, as if by assignment; the contents of the fields are not themselves cloned. Thus, this method performs a "shallow copy" of this object, not a "deep copy" operation.

The class Object does not itself implement the interface Cloneable, so calling the clone method on an object whose class is Object will result in throwing an exception at run time. The clone method is implemented by the class Object as a convenient, general utility for subclasses that implement the interface Cloneable, possibly also overriding the clone method, in which case the overriding definition can refer to this utility definition by the call:

 super.clone()

Overrides:

clone in class Object

Returns:

a copy of this BufferCapabilities object.

See Also:

Cloneable