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QImageFormatType - Factory that makes QImageFormat objects
virtual ~QImageFormatType ()
virtual QImageFormat * decoderFor ( const uchar * buffer, int length ) = 0
virtual const char * formatName () const = 0
The QImageFormatType class is a factory that makes QImageFormat objects.
Whereas 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; you can thus override current and future built-in formats.
See also Graphics Classes, Image Processing Classes, and Multimedia Classes.
MEMBER FUNCTION DOCUMENTATION
QImageFormatType::QImageFormatType () [protected]
Constructs a factory. It automatically registers itself with QImageDecoder.
QImageFormatType::~QImageFormatType () [virtual]
Destroys a factory. It automatically unregisters itself from QImageDecoder.
QImageFormat * QImageFormatType::decoderFor ( const uchar * buffer, int length ) [pure virtual]
Returns a decoder for decoding an image that starts with the bytes in buffer. The length
of the data is given in length. This function should only return a decoder if it is
certain 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
const char * QImageFormatType::formatName () const [pure virtual]
Returns the name of the format supported by decoders from this factory. The string is
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Trolltech AS 9 December 2002 QImageFormatType(3qt)
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