public
class
ImageFormatChecker
extends Object| java.lang.Object | |
| ↳ | com.facebook.imageformat.ImageFormatChecker |
Class Overview
Detects the format of an encoded image.
Summary
| Public Methods | |||||||||||
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| ImageFormat | determineImageFormat(InputStream is) | ||||||||||
| static ImageFormat |
getImageFormat(InputStream is)
Tries to read up to MAX_HEADER_LENGTH bytes from InputStream is and use read bytes to determine
type of the image contained in is.
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| static ImageFormat |
getImageFormat(String filename)
Reads image header from a file indicated by provided filename and determines its format.
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| static ImageFormat | getImageFormat_WrapIOException(InputStream is) | ||||||||||
| synchronized static ImageFormatChecker |
getInstance()
Get the currently used instance of the image format checker
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| void | setCustomImageFormatCheckers(List<ImageFormat.FormatChecker> customImageFormatCheckers) | ||||||||||
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[Expand]
Inherited Methods | |||||||||||
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From class
java.lang.Object
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Public Methods
public static ImageFormat getImageFormat (InputStream is)
Tries to read up to MAX_HEADER_LENGTH bytes from InputStream is and use read bytes to determine type of the image contained in is. If provided input stream does not support mark, then this method consumes data from is and it is not safe to read further bytes from is after this method returns. Otherwise, if mark is supported, it will be used to preserve original content of is.
Returns
- ImageFormat matching content of is InputStream or UNKNOWN if no type is suitable
Throws
| IOException | if exception happens during read |
|---|
public static ImageFormat getImageFormat (String filename)
Reads image header from a file indicated by provided filename and determines its format. This
method does not throw IOException if one occurs. In this case, UNKNOWN will
be returned.
Returns
- ImageFormat for image stored in filename
public static synchronized ImageFormatChecker getInstance ()
Get the currently used instance of the image format checker
Returns
- the image format checker to use