| java.lang.Object | |
| ↳ | com.facebook.imagepipeline.nativecode.NativeJpegTranscoder |
Class Overview
Transcoder for jpeg images, using native code and libjpeg-turbo library.
Summary
| Constants | |||||||||||
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| String | TAG | ||||||||||
| Public Constructors | |||||||||||
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| NativeJpegTranscoder(boolean resizingEnabled, int maxBitmapSize, boolean useDownsamplingRatio, boolean ensureTranscoderLibraryLoaded) | |||||||||||
| Public Methods | |||||||||||
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| boolean |
canResize(EncodedImage encodedImage, RotationOptions rotationOptions, ResizeOptions resizeOptions)
Whether the input image is resized to make subsequent decodings faster.
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| boolean |
canTranscode(ImageFormat imageFormat)
Whether the input
ImageFormat can be transcoded by the image transcoder. | ||||||||||
| String |
getIdentifier()
Gets the identifier of the image transcoder.
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| 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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| 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.
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| 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.
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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From interface
com.facebook.imagepipeline.transcoder.ImageTranscoder
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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
ImageTranscodeResultgenerated when encoding the image.
Throws
| IOException |
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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 |
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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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