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NativeJpegTranscoder

docs/javadoc/reference/com/facebook/imagepipeline/nativecode/NativeJpegTranscoder.html

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Summary: Constants | Ctors | Methods | Inherited Methods | [Expand All]

public class

NativeJpegTranscoder

extends Object
implements ImageTranscoder

| java.lang.Object | | ↳ | com.facebook.imagepipeline.nativecode.NativeJpegTranscoder |

Class Overview

Transcoder for jpeg images, using native code and libjpeg-turbo library.

Summary

Constants
String
Public Constructors
Public Methods
boolean
Whether the input image is resized to make subsequent decodings faster.
boolean
Whether the input ImageFormat can be transcoded by the image transcoder.
String
Gets the identifier of the image transcoder.
ImageTranscodeResult
Transcodes an image to match the specified rotation and resize options.
static void
Transcodes an image to match the specified rotation angle and the scale factor.
static void
Transcodes an image to match the specified exif orientation and the scale factor.

| [Expand] Inherited Methods | | --- | | From class java.lang.Object

| Object | clone() | | boolean | equals(Object arg0) | | void | finalize() | | final Class<?> | getClass() | | int | hashCode() | | final void | notify() | | final void | notifyAll() | | String | toString() | | final void | wait(long arg0, int arg1) | | final void | wait(long arg0) | | final void | wait() |

| | From interface com.facebook.imagepipeline.transcoder.ImageTranscoder

| abstract boolean | canResize(EncodedImage encodedImage, RotationOptions rotationOptions, ResizeOptions resizeOptions) Whether the input image is resized to make subsequent decodings faster. | | abstract boolean | canTranscode(ImageFormat imageFormat) Whether the input ImageFormat can be transcoded by the image transcoder. | | abstract String | getIdentifier() Gets the identifier of the image transcoder. | | abstract ImageTranscodeResult | transcode(EncodedImage encodedImage, OutputStream outputStream, RotationOptions rotationOptions, ResizeOptions resizeOptions, ImageFormat outputFormat, Integer quality) Transcodes an image to match the specified rotation and resize options. |

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Constants

public static final String TAG

Constant Value: "NativeJpegTranscoder"

Public Constructors

public NativeJpegTranscoder(boolean resizingEnabled, int maxBitmapSize, boolean useDownsamplingRatio, boolean ensureTranscoderLibraryLoaded)

Public Methods

public boolean canResize(EncodedImage encodedImage, RotationOptions rotationOptions, ResizeOptions resizeOptions)

Whether the input image is resized to make subsequent decodings faster.

Parameters

| encodedImage | The EncodedImage that will be transcoded. | | rotationOptions | The RotationOptions used when transcoding the image. | | resizeOptions | The ResizeOptions used when transcoding the image. |

Returns
  • true if the image is resized, else false.

public boolean canTranscode(ImageFormat imageFormat)

Whether the input ImageFormat can be transcoded by the image transcoder.

Parameters

| imageFormat | The ImageFormat that will be transcoded. |

Returns
  • true if this image format is handled by the image transcoder, else false.

public String getIdentifier()

Gets the identifier of the image transcoder. This is mostly used for logging purposes.

Returns
  • the identifier of the image transcoder.

public ImageTranscodeResult transcode(EncodedImage encodedImage, OutputStream outputStream, RotationOptions rotationOptions, ResizeOptions resizeOptions, ImageFormat outputFormat, Integer quality)

Transcodes an image to match the specified rotation and resize options. The most common-use case is to create a resized version of an input image to make subsequent decodings faster.

Parameters

| encodedImage | The EncodedImage that will be transcoded. | | outputStream | The OutputStream where the newly created image is written to. | | rotationOptions | The RotationOptions used when transcoding the image. | | resizeOptions | The ResizeOptions used when transcoding the image. | | outputFormat | The desired ImageFormat of the newly created image. If this is null the same format as the input image will be used. | | quality | The desired quality of the newly created image. If this is null, the default quality of the transcoder will be applied. |

Returns
  • The ImageTranscodeResult generated when encoding the image.
Throws

| IOException | |

public static void transcodeJpeg(InputStream inputStream, OutputStream outputStream, int rotationAngle, int scaleNumerator, int quality)

Transcodes an image to match the specified rotation angle and the scale factor.

Parameters

| inputStream | The InputStream of the image that will be transcoded. | | outputStream | The OutputStream where the newly created image is written to. | | rotationAngle | 0, 90, 180 or 270 | | scaleNumerator | 1 - 16, image will be scaled using scaleNumerator/8 factor | | quality | 1 - 100 |

Throws

| IOException | |

public static void transcodeJpegWithExifOrientation(InputStream inputStream, OutputStream outputStream, int exifOrientation, int scaleNumerator, int quality)

Transcodes an image to match the specified exif orientation and the scale factor.

Parameters

| inputStream | The InputStream of the image that will be transcoded. | | outputStream | The OutputStream where the newly created image is written to. | | exifOrientation | 0, 90, 180 or 270 | | scaleNumerator | 1 - 16, image will be scaled using scaleNumerator/8 factor | | quality | 1 - 100 |

Throws

| IOException | |

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