public
class
JpegTranscoderUtils
extends Object| java.lang.Object | |
| ↳ | com.facebook.imagepipeline.transcoder.JpegTranscoderUtils |
Summary
| Constants | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| int | DEFAULT_JPEG_QUALITY | ||||||||||
| int | MAX_QUALITY | ||||||||||
| int | MAX_SCALE_NUMERATOR | ||||||||||
| int | MIN_QUALITY | ||||||||||
| int | MIN_SCALE_NUMERATOR | ||||||||||
| int | SCALE_DENOMINATOR | ||||||||||
| Fields | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| public static final ImmutableList<Integer> | INVERTED_EXIF_ORIENTATIONS | ||||||||||
| Public Constructors | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| JpegTranscoderUtils() | |||||||||||
| Public Methods | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| static int |
calculateDownsampleNumerator(int downsampleRatio)
This method calculate the ratio in case the downsampling was enabled
| ||||||||||
| static float | determineResizeRatio(ResizeOptions resizeOptions, int width, int height) | ||||||||||
| static int |
getForceRotatedInvertedExifOrientation(RotationOptions rotationOptions, EncodedImage encodedImage)
Get an inverted exif orientation (2, 4, 5, 7) but adjusted to take the force rotation angle
into consideration
| ||||||||||
| static int | getRotationAngle(RotationOptions rotationOptions, EncodedImage encodedImage) | ||||||||||
| static int | getSoftwareNumerator(RotationOptions rotationOptions, ResizeOptions resizeOptions, EncodedImage encodedImage, boolean resizingEnabled) | ||||||||||
| static Matrix |
getTransformationMatrix(EncodedImage encodedImage, RotationOptions rotationOptions)
Compute the transformation matrix needed to rotate the image.
| ||||||||||
| static boolean | isExifOrientationAllowed(int exifOrientation) | ||||||||||
| static boolean | isRotationAngleAllowed(int degrees) | ||||||||||
| static int | roundNumerator(float maxRatio, float roundUpFraction) | ||||||||||
|
[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Constants
public static final int DEFAULT_JPEG_QUALITY
Constant Value:
85
(0x00000055)
public static final int MAX_QUALITY
Constant Value:
100
(0x00000064)
public static final int MAX_SCALE_NUMERATOR
Constant Value:
16
(0x00000010)
public static final int MIN_QUALITY
Constant Value:
0
(0x00000000)
public static final int MIN_SCALE_NUMERATOR
Constant Value:
1
(0x00000001)
public static final int SCALE_DENOMINATOR
Constant Value:
8
(0x00000008)
Fields
Public Constructors
public JpegTranscoderUtils ()
Public Methods
public static int calculateDownsampleNumerator (int downsampleRatio)
This method calculate the ratio in case the downsampling was enabled
Parameters
| downsampleRatio | The ratio from downsampling |
|---|
Returns
- The ratio to use for software resize using the downsampling limitation
public static int getForceRotatedInvertedExifOrientation (RotationOptions rotationOptions, EncodedImage encodedImage)
Get an inverted exif orientation (2, 4, 5, 7) but adjusted to take the force rotation angle into consideration
Throws
| IllegalArgumentException | if encoded image passed doesn't have an inverted EXIF orientation |
|---|
public static int getSoftwareNumerator (RotationOptions rotationOptions, ResizeOptions resizeOptions, EncodedImage encodedImage, boolean resizingEnabled)
public static Matrix getTransformationMatrix (EncodedImage encodedImage, RotationOptions rotationOptions)
Compute the transformation matrix needed to rotate the image. If no transformation is needed, it returns null.
Parameters
| encodedImage | The EncodedImage used when computing the matrix. |
|---|---|
| rotationOptions | The RotationOptions used when computing the matrix |
Returns
- The transformation matrix, or null if no transformation is required.
public static boolean isExifOrientationAllowed (int exifOrientation)
Returns
- true if and only if given value is a valid EXIF orientation
public static boolean isRotationAngleAllowed (int degrees)
Returns
- true if and only if given number of degrees is allowed rotation angle, that is it is equal to 0, 90, 180 or 270