1QImageFormatType(3qt)                                    QImageFormatType(3qt)
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NAME

6       QImageFormatType - Factory that makes QImageFormat objects
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SYNOPSIS

9       #include <qasyncimageio.h>
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11   Public Members
12       virtual ~QImageFormatType ()
13       virtual QImageFormat * decoderFor ( const uchar * buffer, int length )
14           = 0
15       virtual const char * formatName () const = 0
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17   Protected Members
18       QImageFormatType ()
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DESCRIPTION

21       The QImageFormatType class is a factory that makes QImageFormat
22       objects.
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24       Whereas the QImageIO class allows for complete loading of images,
25       QImageFormatType allows for incremental loading of images.
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27       New image file formats are installed by creating objects of derived
28       classes of QImageFormatType. They must implement decoderFor() and
29       formatName().
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31       QImageFormatType is a very simple class. Its only task is to recognize
32       image data in some format and make a new object, subclassed from
33       QImageFormat, which can decode that format.
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35       The factories for formats built into Qt are automatically defined
36       before any other factory is initialized. If two factories would
37       recognize an image format, the factory created last will override the
38       earlier one; you can thus override current and future built-in formats.
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40       See also Graphics Classes, Image Processing Classes, and Multimedia
41       Classes.
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MEMBER FUNCTION DOCUMENTATION

QImageFormatType::QImageFormatType () [protected]
45       Constructs a factory. It automatically registers itself with
46       QImageDecoder.
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QImageFormatType::~QImageFormatType () [virtual]
49       Destroys a factory. It automatically unregisters itself from
50       QImageDecoder.
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QImageFormat * QImageFormatType::decoderFor ( const uchar * buffer, int length
53       ) [pure virtual]
54       Returns a decoder for decoding an image that starts with the bytes in
55       buffer. The length of the data is given in length. This function should
56       only return a decoder if it is certain that the decoder applies to data
57       with the given header. Returns 0 if there is insufficient data in the
58       header to make a positive identification or if the data is not
59       recognized.
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const char * QImageFormatType::formatName () const [pure virtual]
62       Returns the name of the format supported by decoders from this factory.
63       The string is statically allocated.
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SEE ALSO
67       http://doc.trolltech.com/qimageformattype.html
68       http://www.trolltech.com/faq/tech.html
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71       Copyright 1992-2007 Trolltech ASA, http://www.trolltech.com.  See the
72       license file included in the distribution for a complete license
73       statement.
74

AUTHOR
76       Generated automatically from the source code.
77

BUGS
79       If you find a bug in Qt, please report it as described in
80       http://doc.trolltech.com/bughowto.html.  Good bug reports help us to
81       help you. Thank you.
82
83       The definitive Qt documentation is provided in HTML format; it is
84       located at $QTDIR/doc/html and can be read using Qt Assistant or with a
85       web browser. This man page is provided as a convenience for those users
86       who prefer man pages, although this format is not officially supported
87       by Trolltech.
88
89       If you find errors in this manual page, please report them to qt-
90       bugs@trolltech.com.  Please include the name of the manual page
91       (qimageformattype.3qt) and the Qt version (3.3.8).
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95Trolltech AS                    2 February 2007          QImageFormatType(3qt)



        

    


            
        

        

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