QImageFormatType(3qt)QImageFormatType(3qt)NAME
QImageFormatType - Factory that makes
#include <qasyncimageio.h>
Public Members
virtual ~QImageFormatType ()
virtual QImageFormat* decoderFor ( const uchar * buffer,
int length )
virtual const char* formatName () const
Protected Members
QImageFormatType ()
DESCRIPTION
Factory that makes QImageFormat objects.
While the QImageIO class allows for complete loading of
images, QImageFormatType allows for incremental loading of
images.
New image file formats are installed by creating objects
of derived classes of QImageFormatType. They must
implement decoderFor() and formatName().
QImageFormatType is a very simple class. Its only task is
to recognize image data in some format and make a new
object, subclassed from QImageFormat, which can decode
that format.
The factories for formats built into Qt are automatically
defined before any other factory is initialized. If two
factories would recognize an image format, the factory
created last will override the earlier one, thus you can
override current and future built-in formats.
MEMBER FUNCTION DOCUMENTATIONQImageFormatType::QImageFormatType () [protected]
Constructs a factory. It automatically registers itself
with QImageDecoder.
QImageFormatType::~QImageFormatType () [virtual]
Destroys a factory. It automatically unregisters itself
from QImageDecoder.
virtual QImageFormat* QImageFormatType::decoderFor ( const uchar
* buffer, int length ) [virtual]
Returns a decoder for decoding an image which starts with
the give bytes. This function should only return a decoder
if it is definite that the decoder applies to data with
the given header. Returns 0 if there is insufficient data
in the header to make a positive identification, or if the
data is not recognized.
Trolltech AS 13 June 2001 1
QImageFormatType(3qt)QImageFormatType(3qt)virtual const char* QImageFormatType::formatName () const
[virtual]
Returns the name of the format supported by decoders from
this factory. The string is statically allocated.
SEE ALSO
http://doc.trolltech.com/qimageformattype.html
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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make our job much simpler. Thank you.
In case of content or formattting problems with this
manual page, please report them to qt-bugs@trolltech.com.
Please include the name of the manual page
(qimageformattype.3qt) and the Qt version (2.3.1).
Trolltech AS 13 June 2001 2
