程序包 ohos.media.image

类 Image

java.lang.Object

ohos.media.image.Image

public class Image
extends Object

Provides basic image operations, including obtaining image information, and reading and writing image data.

An Image object can be generated by an ImageReceiver object.

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SystemCapability

SystemCapability.Multimedia#IMAGE

嵌套类概要

嵌套类

限定符和类型	类	说明
static class	Image.Component	Describes image color components.

方法概要

限定符和类型	方法	说明
protected void	finalize()	Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
Rect	getClipRect()	Obtains the cropped area of an image.
Image.Component	getComponent(ImageFormat.ComponentType componentType)	Obtains the color component based on a specified component type.
int	getFormat()	Obtains the image format.
Size	getImageSize()	Obtains the image size.
long	getTimestamp()	Obtains the image timestamp, in nanoseconds.
void	release()	Releases native resources associated with the image.
void	setClipRect(Rect clipRect)	Sets the image area to crop.

从类继承的方法 java.lang.Object

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

方法详细资料

getFormat

public int getFormat()

Obtains the image format.

返回:

Returns the image format, which is defined by ImageFormat.

抛出:

IllegalStateException - Throws this exception if the operation is not supported, for example, if native resources associated with the receiver or image are released.

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getImageSize

public Size getImageSize()

Obtains the image size.

返回:

Returns the image size, which is specified by a Size object.

抛出:

IllegalStateException - Throws this exception if the operation is not supported, for example, if native resources associated with the receiver or image are released.

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getTimestamp

public long getTimestamp()

Obtains the image timestamp, in nanoseconds.

返回:

Returns the timestamp.

抛出:

IllegalStateException - Throws this exception if the operation is not supported, for example, if native resources associated with the receiver or image are released.

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getClipRect

public Rect getClipRect()

Obtains the cropped area of an image.

返回:

Returns the cropped area, which is specified by a Rect object.

抛出:

IllegalStateException - Throws this exception if the operation is not supported, for example, if native resources associated with the receiver or image are released.

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setClipRect

public void setClipRect(Rect clipRect)

Sets the image area to crop.

If the area exceeds the image size or is outside of the image, the cropping will not be operated.

参数:

clipRect - Indicates the image area to crop, which is specified by a Rect object.

抛出:

IllegalStateException - Throws this exception if the operation is not supported, for example, if native resources associated with the receiver or image are released.

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release

public void release()

Releases native resources associated with the image.

After the image data is released, any image operation will not be supported.

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finalize

protected void finalize()
                 throws Throwable

从类复制的说明: Object

Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. A subclass overrides the finalize method to dispose of system resources or to perform other cleanup.

The general contract of finalize is that it is invoked if and when the Java™ virtual machine has determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, except as a result of an action taken by the finalization of some other object or class which is ready to be finalized. The finalize method may take any action, including making this object available again to other threads; the usual purpose of finalize, however, is to perform cleanup actions before the object is irrevocably discarded. For example, the finalize method for an object that represents an input/output connection might perform explicit I/O transactions to break the connection before the object is permanently discarded.

The finalize method of class Object performs no special action; it simply returns normally. Subclasses of Object may override this definition.

The Java programming language does not guarantee which thread will invoke the finalize method for any given object. It is guaranteed, however, that the thread that invokes finalize will not be holding any user-visible synchronization locks when finalize is invoked. If an uncaught exception is thrown by the finalize method, the exception is ignored and finalization of that object terminates.

After the finalize method has been invoked for an object, no further action is taken until the Java virtual machine has again determined that there is no longer any means by which this object can be accessed by any thread that has not yet died, including possible actions by other objects or classes which are ready to be finalized, at which point the object may be discarded.

The finalize method is never invoked more than once by a Java virtual machine for any given object.

Any exception thrown by the finalize method causes the finalization of this object to be halted, but is otherwise ignored.

覆盖:

finalize 在类中 Object

抛出:

Throwable - the Exception raised by this method

另请参阅:

WeakReference, PhantomReference

getComponent

public Image.Component getComponent(ImageFormat.ComponentType componentType)

Obtains the color component based on a specified component type.

参数:

componentType - Indicates a color component type, which is specified by ImageFormat.ComponentType.

返回:

Returns the image color component if obtained; returns null if the image does not have the type of color component.

抛出:

IllegalStateException - Throws this exception if the operation is not supported, for example, if native resources associated with the receiver or image are released.

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