QImageFormat - Incremental image decoder for a specific image format
virtual int decode ( QImage & img, QImageConsumer * consumer, const uchar * buffer, int
length ) = 0
The QImageFormat class is an incremental image decoder for a specific image format.
By making a derived class of QImageFormatType, which in turn creates objects that are a
subclass of QImageFormat, you can add support for more incremental image formats, allowing
such formats to be sources for a QMovie or for the first frame of the image stream to be
loaded as a QImage or QPixmap.
Your new subclass must reimplement the decode() function in order to process your new
New QImageFormat objects are generated by new QImageFormatType factories.
See also Graphics Classes, Image Processing Classes, and Multimedia Classes.
MEMBER FUNCTION DOCUMENTATION
int QImageFormat::decode ( QImage & img, QImageConsumer * consumer, const uchar * buffer, int
length ) [pure virtual]
New subclasses must reimplement this method.
It should decode some or all of the bytes from buffer into img, calling the methods of
consumer as the decoding proceeds to inform that consumer of changes to the image. The
length of the data is given in length. The consumer may be 0, in which case the function
should just process the data into img without telling any consumer about the changes. Note
that the decoder must store enough state to be able to continue in subsequent calls to
this method - this is the essence of the incremental image loading.
The function should return without processing all the data if it reaches the end of a
frame in the input.
The function must return the number of bytes it has processed.
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the license file
included in the distribution for a complete license statement.
Generated automatically from the source code.
If you find a bug in Qt, please report it as described in
http://doc.trolltech.com/bughowto.html. Good bug reports help us to help you. Thank you.
The definitive Qt documentation is provided in HTML format; it is located at
$QTDIR/doc/html and can be read using Qt Assistant or with a web browser. This man page is
provided as a convenience for those users who prefer man pages, although this format is
not officially supported by Trolltech.
If you find errors in this manual page, please report them to firstname.lastname@example.org.
Please include the name of the manual page (qimageformat.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QImageFormat(3qt)