QImageFormat(3qt)QImageFormat(3qt)NAME
QImageFormat - Incremental image decoder for a specific
image format
#include <qasyncimageio.h>
Public Members
virtual ~QImageFormat ()
virtual int decode ( QImage & img, QImageConsumer *
consumer, const uchar * buffer, int length )
DESCRIPTION
Incremental image decoder for a specific image format.
By making a derived classes 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.
MEMBER FUNCTION DOCUMENTATIONQImageFormat::~QImageFormat () [virtual]
Destructs the object.
int QImageFormat::decode ( QImage & img, QImageConsumer *
consumer, const uchar * buffer, int length ) [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 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
Trolltech AS 13 June 2001 1
QImageFormat(3qt)QImageFormat(3qt)
http://www.trolltech.com/faq/tech.html
COPYRIGHT
Copyright 1992-2001 Trolltech AS,
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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Please include the name of the manual page
(qimageformat.3qt) and the Qt version (2.3.1).
Trolltech AS 13 June 2001 2
