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QImageDecoder(3qt)							       QImageDecoder(3qt)

       QImageDecoder - Incremental image decoder for all supported image formats

       #include <qasyncimageio.h>

   Public Members
       QImageDecoder ( QImageConsumer * c )
       ~QImageDecoder ()
       const QImage & image ()
       int decode ( const uchar * buffer, int length )

   Static Public Members
       const char * formatName ( const uchar * buffer, int length )
       QImageFormatType * format ( const char * name )
       QStrList inputFormats ()
       void registerDecoderFactory ( QImageFormatType * f )
       void unregisterDecoderFactory ( QImageFormatType * f )

       The QImageDecoder class is an incremental image decoder for all supported image formats.

       New formats are installed by creating objects of class QImageFormatType; the QMovie class
       can be used for all installed incremental image formats. QImageDecoder is only useful for
       creating new ways of feeding data to an QImageConsumer.

       A QImageDecoder is a machine that decodes images. It takes encoded image data via its
       decode() method and expresses its decoding by supplying information to a QImageConsumer.
       It implements its decoding by using a QImageFormat created by one of the currently-
       existing QImageFormatType factory objects.

       QImageFormatType and QImageFormat are the classes that you might need to implement support
       for additional image formats.

       Qt supports GIF reading if it is configured that way during installation (see qgif.h). If
       it is, we are required to state that" The Graphics Interchange Format(c) is the Copyright
       property of CompuServe Incorporated. GIF(sm) is a Service Mark property of CompuServe

       Warning: If you are in a country that recognizes software patents and in which Unisys
       holds a patent on LZW compression and/or decompression and you want to use GIF, Unisys may
       require you to license that technology. Such countries include Canada, Japan, the USA,
       France, Germany, Italy and the UK.

       GIF support may be removed completely in a future version of Qt. We recommend using the
       MNG or PNG format.

       See also Graphics Classes, Image Processing Classes, and Multimedia Classes.

QImageDecoder::QImageDecoder ( QImageConsumer * c )
       Constructs a QImageDecoder that will send change information to the QImageConsumer c.

QImageDecoder::~QImageDecoder ()
       Destroys a QImageDecoder. The image it built is destroyed. The decoder built by the
       factory for the file format is destroyed. The consumer for which it decoded the image is
       not destroyed.

int QImageDecoder::decode ( const uchar * buffer, int length )
       Call this function to decode some data into image changes. The data in buffer will be
       decoded, sending change information to the QImageConsumer of this QImageDecoder until one
       of the change functions of the consumer returns FALSE. The length of the data is given in

       Returns the number of bytes consumed: 0 if consumption is complete, and -1 if decoding
       fails due to invalid data.

QImageFormatType * QImageDecoder::format ( const char * name ) [static]
       Returns a QImageFormatType by name. This might be used when the user needs to force data
       to be interpreted as being in a certain format. name is one of the formats listed by
       QImageDecoder::inputFormats(). Note that you will still need to supply decodable data to
       result->decoderFor() before you can begin decoding the data.

const char * QImageDecoder::formatName ( const uchar * buffer, int length ) [static]
       Call this function to find the name of the format of the given header. The returned string
       is statically allocated. The function will look at the first length characters in the

       Returns 0 if the format is not recognized.

const QImage &; QImageDecoder::image ()
       Returns the image currently being decoded.

QStrList QImageDecoder::inputFormats () [static]
       Returns a sorted list of formats for which asynchronous loading is supported.

void QImageDecoder::registerDecoderFactory ( QImageFormatType * f ) [static]
       Registers the new QImageFormatType f. This is not needed in application code because
       factories call this themselves.

void QImageDecoder::unregisterDecoderFactory ( QImageFormatType * f ) [static]
       Unregisters the QImageFormatType f. This is not needed in application code because
       factories call this themselves.

       http://doc.trolltech.com/qimagedecoder.html http://www.trolltech.com/faq/tech.html

       Copyright 1992-2001 Trolltech AS, 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 qt-bugs@trolltech.com.
       Please include the name of the manual page (qimagedecoder.3qt) and the Qt version (3.1.1).

Trolltech AS				 9 December 2002		       QImageDecoder(3qt)
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