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| 6 | <title>QImageFormat Class</title>
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| 32 | <td align="right" valign="center"><img src="logo32.png" align="right" width="64" height="32" border="0"></td></tr></table><h1 align=center>QImageFormat Class Reference</h1>
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| 33 |
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| 34 | <p>The QImageFormat class is an incremental image decoder for a specific image format.
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| 35 | <a href="#details">More...</a>
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| 36 | <p><tt>#include <<a href="qasyncimageio-h.html">qasyncimageio.h</a>></tt>
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| 37 | <p><a href="qimageformat-members.html">List of all member functions.</a>
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| 38 | <h2>Public Members</h2>
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| 39 | <ul>
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| 40 | <li class=fn>virtual int <a href="#decode"><b>decode</b></a> ( QImage & img, QImageConsumer * consumer, const uchar * buffer, int length ) = 0</li>
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| 41 | </ul>
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| 42 | <hr><a name="details"></a><h2>Detailed Description</h2>
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| 43 |
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| 44 |
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| 45 | The QImageFormat class is an incremental image decoder for a specific image format.
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| 46 | <p>
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| 47 |
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| 48 |
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| 49 | <p> By making a derived class of <a href="qimageformattype.html">QImageFormatType</a>, which in turn
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| 50 | creates objects that are a subclass of QImageFormat, you can add
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| 51 | support for more incremental image formats, allowing such formats
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| 52 | to be sources for a <a href="qmovie.html">QMovie</a> or for the first frame of the image
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| 53 | stream to be loaded as a <a href="qimage.html">QImage</a> or <a href="qpixmap.html">QPixmap</a>.
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| 54 | <p> Your new subclass must reimplement the <a href="#decode">decode</a>() function in order
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| 55 | to process your new format.
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| 56 | <p> New QImageFormat objects are generated by new QImageFormatType
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| 57 | factories.
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| 58 | <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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| 59 |
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| 60 | <hr><h2>Member Function Documentation</h2>
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| 61 | <h3 class=fn>int <a name="decode"></a>QImageFormat::decode ( <a href="qimage.html">QImage</a> & img, <a href="qimageconsumer.html">QImageConsumer</a> * consumer, const uchar * buffer, int length )<tt> [pure virtual]</tt>
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| 62 | </h3>
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| 63 |
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| 64 | <p> New subclasses must reimplement this method.
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| 65 | <p> It should decode some or all of the bytes from <em>buffer</em> into <em>img</em>, calling the methods of <em>consumer</em> as the decoding proceeds
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| 66 | to inform that consumer of changes to the image. The length of the
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| 67 | data is given in <em>length</em>. The consumer may be 0, in which case
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| 68 | the function should just process the data into <em>img</em> without
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| 69 | telling any consumer about the changes. Note that the decoder must
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| 70 | store enough state to be able to continue in subsequent calls to
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| 71 | this method - this is the essence of the incremental image
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| 72 | loading.
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| 73 | <p> The function should return without processing all the data if it
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| 74 | reaches the end of a frame in the input.
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| 75 | <p> The function must return the number of bytes it has processed.
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| 76 |
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| 77 | <!-- eof -->
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| 78 | <hr><p>
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| 79 | This file is part of the <a href="index.html">Qt toolkit</a>.
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| 80 | Copyright © 1995-2007
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| 81 | <a href="http://www.trolltech.com/">Trolltech</a>. All Rights Reserved.<p><address><hr><div align=center>
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| 83 | <td>Copyright © 2007
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| 84 | <a href="troll.html">Trolltech</a><td align=center><a href="trademarks.html">Trademarks</a>
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| 85 | <td align=right><div align=right>Qt 3.3.8</div>
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| 86 | </table></div></address></body>
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