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155 lines
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<title>TQImageDecoder 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>TQImageDecoder Class Reference</h1>
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<p>The TQImageDecoder class is an incremental image decoder for all supported image formats.
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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="qimagedecoder-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><a href="#TQImageDecoder"><b>TQImageDecoder</b></a> ( TQImageConsumer * c )</li>
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<li class=fn><a href="#~TQImageDecoder"><b>~TQImageDecoder</b></a> ()</li>
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<li class=fn>const TQImage & <a href="#image"><b>image</b></a> ()</li>
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<li class=fn>int <a href="#decode"><b>decode</b></a> ( const uchar * buffer, int length )</li>
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</ul>
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<h2>Static Public Members</h2>
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<ul>
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<li class=fn>const char * <a href="#formatName"><b>formatName</b></a> ( const uchar * buffer, int length )</li>
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<li class=fn>TQImageFormatType * <a href="#format"><b>format</b></a> ( const char * name )</li>
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<li class=fn>TQStrList <a href="#inputFormats"><b>inputFormats</b></a> ()</li>
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<li class=fn>void <a href="#registerDecoderFactory"><b>registerDecoderFactory</b></a> ( TQImageFormatType * f )</li>
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<li class=fn>void <a href="#unregisterDecoderFactory"><b>unregisterDecoderFactory</b></a> ( TQImageFormatType * f )</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQImageDecoder class is an incremental image decoder for all supported image formats.
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<p>
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<p> New formats are installed by creating objects of class
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<a href="qimageformattype.html">TQImageFormatType</a>; the <a href="ntqmovie.html">TQMovie</a> class can be used for all installed
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incremental image formats. TQImageDecoder is only useful for
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creating new ways of feeding data to an <a href="qimageconsumer.html">TQImageConsumer</a>.
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<p> A TQImageDecoder is a machine that decodes images. It takes encoded
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image data via its <a href="#decode">decode</a>() method and expresses its decoding by
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supplying information to a TQImageConsumer. It implements its
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decoding by using a <a href="qimageformat.html">TQImageFormat</a> created by one of the
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currently-existing TQImageFormatType factory objects.
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<p> TQImageFormatType and TQImageFormat are the classes that you might
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need to implement support for additional image formats.
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<p>
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<p> TQt supports GIF reading if it is configured that way during
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installation (see ntqgif.h). If it is, we are required to state that
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"The Graphics Interchange Format(c) is the Copyright property of
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CompuServe Incorporated. GIF(sm) is a Service Mark property of
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CompuServe Incorporated."
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<p> <b>Warning:</b> If you are in a country that recognizes software patents
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and in which Unisys holds a patent on LZW compression and/or
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decompression and you want to use GIF, Unisys may require you to
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license that technology. Such countries include Canada, Japan,
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the USA, France, Germany, Italy and the UK.
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<p> GIF support may be removed completely in a future version of TQt.
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We recommend using the MNG or PNG format.
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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="TQImageDecoder"></a>TQImageDecoder::TQImageDecoder ( <a href="qimageconsumer.html">TQImageConsumer</a> * c )
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</h3>
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Constructs a TQImageDecoder that will send change information to
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the <a href="qimageconsumer.html">TQImageConsumer</a> <em>c</em>.
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<h3 class=fn><a name="~TQImageDecoder"></a>TQImageDecoder::~TQImageDecoder ()
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</h3>
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Destroys a TQImageDecoder. The image it built is destroyed. The
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decoder built by the factory for the file format is destroyed. The
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consumer for which it decoded the image is <em>not</em> destroyed.
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<h3 class=fn>int <a name="decode"></a>TQImageDecoder::decode ( const uchar * buffer, int length )
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</h3>
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Call this function to decode some data into image changes. The
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data in <em>buffer</em> will be decoded, sending change information to
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the <a href="qimageconsumer.html">TQImageConsumer</a> of this TQImageDecoder until one of the change
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functions of the consumer returns FALSE. The length of the data is
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given in <em>length</em>.
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<p> Returns the number of bytes consumed: 0 if consumption is
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complete, and -1 if decoding fails due to invalid data.
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<h3 class=fn><a href="qimageformattype.html">TQImageFormatType</a> * <a name="format"></a>TQImageDecoder::format ( const char * name )<tt> [static]</tt>
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</h3>
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Returns a <a href="qimageformattype.html">TQImageFormatType</a> by name. This might be used when the
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user needs to force data to be interpreted as being in a certain
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format. <em>name</em> is one of the formats listed by
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<a href="#inputFormats">TQImageDecoder::inputFormats</a>(). Note that you will still need to
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supply decodable data to result->decoderFor() before you can begin
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decoding the data.
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<h3 class=fn>const char * <a name="formatName"></a>TQImageDecoder::formatName ( const uchar * buffer, int length )<tt> [static]</tt>
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</h3>
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Call this function to find the name of the format of the given
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header. The returned string is statically allocated. The function
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will look at the first <em>length</em> characters in the <em>buffer</em>.
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<p> Returns 0 if the format is not recognized.
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<h3 class=fn>const <a href="ntqimage.html">TQImage</a> & <a name="image"></a>TQImageDecoder::image ()
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</h3>
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<p> Returns the image currently being decoded.
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<h3 class=fn><a href="ntqstrlist.html">TQStrList</a> <a name="inputFormats"></a>TQImageDecoder::inputFormats ()<tt> [static]</tt>
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</h3>
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Returns a sorted list of formats for which asynchronous loading is
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supported.
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<h3 class=fn>void <a name="registerDecoderFactory"></a>TQImageDecoder::registerDecoderFactory ( <a href="qimageformattype.html">TQImageFormatType</a> * f )<tt> [static]</tt>
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</h3>
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Registers the new <a href="qimageformattype.html">TQImageFormatType</a> <em>f</em>. This is not needed in
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application code because factories call this themselves.
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<h3 class=fn>void <a name="unregisterDecoderFactory"></a>TQImageDecoder::unregisterDecoderFactory ( <a href="qimageformattype.html">TQImageFormatType</a> * f )<tt> [static]</tt>
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</h3>
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Unregisters the <a href="qimageformattype.html">TQImageFormatType</a> <em>f</em>. This is not needed in
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application code because factories call this themselves.
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Copyright © 1995-2007
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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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<td align=right><div align=right>TQt 3.3.8</div>
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