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<td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QImageFormatType Class Reference</h1>
<p>The QImageFormatType class is a factory that makes QImageFormat objects.
<a href="#details">More...</a>
<p><tt>#include <<a href="qasyncimageio-h.html">qasyncimageio.h</a>></tt>
<p><a href="qimageformattype-members.html">List of all member functions.</a>
<h2>Public Members</h2>
<ul>
<li><div class=fn>virtual <a href="#~QImageFormatType"><b>~QImageFormatType</b></a> ()</div></li>
<li><div class=fn>virtual QImageFormat * <a href="#decoderFor"><b>decoderFor</b></a> ( const uchar * buffer, int length ) = 0</div></li>
<li><div class=fn>virtual const char * <a href="#formatName"><b>formatName</b></a> () const = 0</div></li>
</ul>
<h2>Protected Members</h2>
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<li><div class=fn><a href="#QImageFormatType"><b>QImageFormatType</b></a> ()</div></li>
</ul>
<hr><a name="details"></a><h2>Detailed Description</h2>
The QImageFormatType class is a factory that makes <a href="qimageformat.html">QImageFormat</a> objects.
<p>
<p> Whereas the <a href="qimageio.html">QImageIO</a> class allows for <em>complete</em> loading of images,
QImageFormatType allows for <em>incremental</em> loading of images.
<p> New image file formats are installed by creating objects of derived
classes of QImageFormatType. They must implement <a href="#decoderFor">decoderFor</a>()
and <a href="#formatName">formatName</a>().
<p> 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.
<p> 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.
<p>See also <a href="graphics.html">Graphics Classes</a>, <a href="images.html">Image Processing Classes</a> and <a href="multimedia.html">Multimedia Classes</a>.
<hr><h2>Member Function Documentation</h2>
<h3 class=fn><a name="QImageFormatType"></a>QImageFormatType::QImageFormatType ()<tt> [protected]</tt>
</h3>
Constructs a factory. It automatically registers itself with <a href="qimagedecoder.html">QImageDecoder</a>.
<h3 class=fn><a name="~QImageFormatType"></a>QImageFormatType::~QImageFormatType ()<tt> [virtual]</tt>
</h3>
Destroys a factory. It automatically unregisters itself from <a href="qimagedecoder.html">QImageDecoder</a>.
<h3 class=fn><a href="qimageformat.html">QImageFormat</a> * <a name="decoderFor"></a>QImageFormatType::decoderFor ( const uchar * buffer, int length )<tt> [pure virtual]</tt>
</h3>
<p> Returns a decoder for decoding an image that starts with the bytes
in <em>buffer</em>. The length of the data is given in <em>length</em>. 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 recognized.
<h3 class=fn>const char * <a name="formatName"></a>QImageFormatType::formatName () const<tt> [pure virtual]</tt>
</h3>
<p> Returns the name of the format supported by decoders from this factory.
The string is statically allocated.
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