QImageFormat(3qt)QImageFormat(3qt)NAMEQImageFormat - Incremental image decoder for a specific image format
SYNOPSIS
#include <qasyncimageio.h>
Public Members
virtual int decode ( QImage & img, QImageConsumer * consumer, const
uchar * buffer, int length ) = 0
DESCRIPTION
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 format.
New QImageFormat objects are generated by new QImageFormatType
factories.
See also Graphics Classes, Image Processing Classes, and Multimedia
Classes.
MEMBER FUNCTION DOCUMENTATIONint 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.
SEE ALSO
http://doc.trolltech.com/qimageformat.html
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com. See the
license file included in the distribution for a complete license
statement.
AUTHOR
Generated automatically from the source code.
BUGS
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help you. Thank you.
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If you find errors in this manual page, please report them to qt-
bugs@trolltech.com. Please include the name of the manual page
(qimageformat.3qt) and the Qt version (3.3.8).
Trolltech AS 2 February 2007 QImageFormat(3qt)
