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109 lines
4.9 KiB
109 lines
4.9 KiB
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<title>TQImageFormatType Class</title>
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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>TQImageFormatType Class Reference</h1>
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<p>The TQImageFormatType class is a factory that makes TQImageFormat objects.
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<a href="#details">More...</a>
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<p><tt>#include <<a href="qasyncimageio-h.html">ntqasyncimageio.h</a>></tt>
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<p><a href="qimageformattype-members.html">List of all member functions.</a>
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<h2>Public Members</h2>
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<ul>
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<li class=fn>virtual <a href="#~TQImageFormatType"><b>~TQImageFormatType</b></a> ()</li>
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<li class=fn>virtual TQImageFormat * <a href="#decoderFor"><b>decoderFor</b></a> ( const uchar * buffer, int length ) = 0</li>
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<li class=fn>virtual const char * <a href="#formatName"><b>formatName</b></a> () const = 0</li>
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</ul>
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<h2>Protected Members</h2>
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<ul>
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<li class=fn><a href="#TQImageFormatType"><b>TQImageFormatType</b></a> ()</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQImageFormatType class is a factory that makes <a href="qimageformat.html">TQImageFormat</a> objects.
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<p>
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<p> Whereas the <a href="qimageio.html">TQImageIO</a> class allows for <em>complete</em> loading of
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images, TQImageFormatType allows for <em>incremental</em> loading of
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images.
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<p> New image file formats are installed by creating objects of
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derived classes of TQImageFormatType. They must implement
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<a href="#decoderFor">decoderFor</a>() and <a href="#formatName">formatName</a>().
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<p> TQImageFormatType is a very simple class. Its only task is to
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recognize image data in some format and make a new object,
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subclassed from TQImageFormat, which can decode that format.
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<p> The factories for formats built into TQt are automatically defined
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before any other factory is initialized. If two factories would
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recognize an image format, the factory created last will override
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the earlier one; you can thus override current and future built-in
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formats.
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<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>.
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<hr><h2>Member Function Documentation</h2>
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<h3 class=fn><a name="TQImageFormatType"></a>TQImageFormatType::TQImageFormatType ()<tt> [protected]</tt>
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</h3>
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Constructs a factory. It automatically registers itself with
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<a href="qimagedecoder.html">TQImageDecoder</a>.
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<h3 class=fn><a name="~TQImageFormatType"></a>TQImageFormatType::~TQImageFormatType ()<tt> [virtual]</tt>
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</h3>
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Destroys a factory. It automatically unregisters itself from
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<a href="qimagedecoder.html">TQImageDecoder</a>.
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<h3 class=fn><a href="qimageformat.html">TQImageFormat</a> * <a name="decoderFor"></a>TQImageFormatType::decoderFor ( const uchar * buffer, int length )<tt> [pure virtual]</tt>
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</h3>
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<p> Returns a decoder for decoding an image that starts with the bytes
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in <em>buffer</em>. The length of the data is given in <em>length</em>. This
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function should only return a decoder if it is certain that the
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decoder applies to data with the given header. Returns 0 if there
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is insufficient data in the header to make a positive
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identification or if the data is not recognized.
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<h3 class=fn>const char * <a name="formatName"></a>TQImageFormatType::formatName () const<tt> [pure virtual]</tt>
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</h3>
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<p> Returns the name of the format supported by decoders from this
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factory. The string is statically allocated.
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<a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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