public
class
JfifUtil
extends Object| java.lang.Object | |
| ↳ | com.facebook.imageutils.JfifUtil |
Class Overview
Util for obtaining information from JPEG file.
Summary
| Constants | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| int | APP1_EXIF_MAGIC | ||||||||||
| int | MARKER_APP1 | ||||||||||
| int | MARKER_EOI | ||||||||||
| int | MARKER_ESCAPE_BYTE | ||||||||||
| int | MARKER_FIRST_BYTE | Definitions of jpeg markers as well as overall description of jpeg file format can be found here: Recommendation T.81 | |||||||||
| int | MARKER_RST0 | ||||||||||
| int | MARKER_RST7 | ||||||||||
| int | MARKER_SOFn | ||||||||||
| int | MARKER_SOI | ||||||||||
| int | MARKER_SOS | ||||||||||
| int | MARKER_TEM | ||||||||||
| Public Methods | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| static int |
getAutoRotateAngleFromOrientation(int orientation)
Determines auto-rotate angle based on orientation information.
| ||||||||||
| static int |
getOrientation(byte[] jpeg)
Gets orientation information from jpeg byte array.
| ||||||||||
| static int |
getOrientation(InputStream is)
Get orientation information from jpeg input stream.
| ||||||||||
| static boolean |
moveToMarker(InputStream is, int markerToFind)
Reads the content of the input stream until specified marker is found.
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[Expand]
Inherited Methods | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
From class
java.lang.Object
| |||||||||||
Constants
public static final int APP1_EXIF_MAGIC
Constant Value:
1165519206
(0x45786966)
public static final int MARKER_APP1
Constant Value:
225
(0x000000e1)
public static final int MARKER_EOI
Constant Value:
217
(0x000000d9)
public static final int MARKER_ESCAPE_BYTE
Constant Value:
0
(0x00000000)
public static final int MARKER_FIRST_BYTE
Definitions of jpeg markers as well as overall description of jpeg file format can be found here: Recommendation T.81
Constant Value:
255
(0x000000ff)
public static final int MARKER_RST0
Constant Value:
208
(0x000000d0)
public static final int MARKER_RST7
Constant Value:
215
(0x000000d7)
public static final int MARKER_SOFn
Constant Value:
192
(0x000000c0)
public static final int MARKER_SOI
Constant Value:
216
(0x000000d8)
public static final int MARKER_SOS
Constant Value:
218
(0x000000da)
public static final int MARKER_TEM
Constant Value:
1
(0x00000001)
Public Methods
public static int getAutoRotateAngleFromOrientation (int orientation)
Determines auto-rotate angle based on orientation information.
Parameters
| orientation | orientation information, one of {1, 3, 6, 8}. |
|---|
Returns
- orientation: 1/3/6/8 -> 0/180/90/270.
public static int getOrientation (byte[] jpeg)
Gets orientation information from jpeg byte array.
Parameters
| jpeg | the input byte array of jpeg image |
|---|
Returns
- orientation: 1/8/3/6. Returns 0 if there is no valid orientation information.
public static int getOrientation (InputStream is)
Get orientation information from jpeg input stream.
Parameters
| is | the input stream of jpeg image |
|---|
Returns
- orientation: 1/8/3/6. Returns {@value android.media.ExifInterface#ORIENTATION_UNDEFINED} if there is no valid orientation information.
public static boolean moveToMarker (InputStream is, int markerToFind)
Reads the content of the input stream until specified marker is found. Marker will be consumed and the input stream will be positioned after the specified marker.
Parameters
| is | the input stream to read bytes from |
|---|---|
| markerToFind | the marker we are looking for |
Returns
- boolean: whether or not we found the expected marker from input stream.
Throws
| IOException |
|---|