程序包 ohos.media.image

类 ImageSource.DecodingOptions

java.lang.Object

ohos.media.image.ImageSource.DecodingOptions

封闭类:

ImageSource

public static class ImageSource.DecodingOptions
extends Object

Provides image decoding options.

The options include the pixel format, color space, and parameters for cropping, scaling, and rotating an image.

从以下版本开始:

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字段概要

字段

限定符和类型	字段	说明
AllocatorType	allocator	Indicates the memory allocation type for decoded image data.
boolean	allowPartialImage	Indicates whether to allow partial image decoding.
static int	DEFAULT_SAMPLE_SIZE	Indicates the default sampling size.
ColorSpace	desiredColorSpace	Indicates the color space of a decoded image, which is defined by ColorSpace.
PixelFormat	desiredPixelFormat	Indicates the pixel format of a decoded image, which is defined by PixelFormat.
Rect	desiredRegion	Indicates an image area to be decoded.
Size	desiredSize	Indicates the expected output size.
boolean	editable	Specifies whether pixel values of the pixel map to be decoded can be edited.
int	fitDensity	Indicates the pixel density of the decoded image.
float	rotateDegrees	Indicates the rotation angle, ranging from 0 to 360.
int	sampleSize	Indicates the sampling size based on which an image is scaled down.

构造器概要

构造器

构造器	说明
DecodingOptions()

方法概要

从类继承的方法 java.lang.Object

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

字段详细资料

DEFAULT_SAMPLE_SIZE

public static final int DEFAULT_SAMPLE_SIZE

Indicates the default sampling size.

从以下版本开始:

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另请参阅:

常量字段值

allocator

public AllocatorType allocator

Indicates the memory allocation type for decoded image data.

从以下版本开始:

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allowPartialImage

public boolean allowPartialImage

Indicates whether to allow partial image decoding.

When this option is set to false and an incomplete image is partially decoded, the decoding fails.

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desiredColorSpace

public ColorSpace desiredColorSpace

Indicates the color space of a decoded image, which is defined by ColorSpace.

If this color space is supported, the decoder will decode the image to one with this color space. Otherwise, the decoder will select the most suitable color space for the image.

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desiredPixelFormat

public PixelFormat desiredPixelFormat

Indicates the pixel format of a decoded image, which is defined by PixelFormat.

If this format is supported, the decoder will decode the image to the target format. Otherwise, the decoder will select the most suitable format for the image.

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desiredRegion

public Rect desiredRegion

Indicates an image area to be decoded.

If area decoding is not supported, the entire image is decoded and then cropped with a rectangle. The area to be decoded is specified based on the original image instead of an edited image.

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desiredSize

public Size desiredSize

Indicates the expected output size.

If the opted size is different from the original image size, the image is output after being scaled up or down. If both sampleSize and this option are set, this option prevails. This variable specifies the final size of an output image. If this variable, desiredRegion, and rotateDegrees are all set, the expected image area will be decoded, rotated, and then scaled to the expected size.

从以下版本开始:

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editable

public boolean editable

Specifies whether pixel values of the pixel map to be decoded can be edited. Value true means that the values can be edited, and false means the opposite. The default value is false.

从以下版本开始:

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fitDensity

public int fitDensity

Indicates the pixel density of the decoded image.

从以下版本开始:

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rotateDegrees

public float rotateDegrees

Indicates the rotation angle, ranging from 0 to 360. An image is rotated clockwise with the original image center as the rotation center.

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sampleSize

public int sampleSize

Indicates the sampling size based on which an image is scaled down. For example, if the value is 2, both the width and height of the image are scaled down to half of the original. The value must be an integer, 1 or greater.

从以下版本开始:

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构造器详细资料

DecodingOptions

public DecodingOptions()