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88 lines
4.2 KiB
88 lines
4.2 KiB
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<title>TQImageFormat 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>TQImageFormat Class Reference</h1>
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<p>The TQImageFormat class is an incremental image decoder for a specific image format.
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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="tqimageformat-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 int <a href="#decode"><b>decode</b></a> ( TQImage & img, TQImageConsumer * consumer, const uchar * buffer, int length ) = 0</li>
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</ul>
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<hr><a name="details"></a><h2>Detailed Description</h2>
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The TQImageFormat class is an incremental image decoder for a specific image format.
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<p>
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<p> By making a derived class of <a href="tqimageformattype.html">TQImageFormatType</a>, which in turn
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creates objects that are a subclass of TQImageFormat, you can add
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support for more incremental image formats, allowing such formats
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to be sources for a <a href="tqmovie.html">TQMovie</a> or for the first frame of the image
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stream to be loaded as a <a href="tqimage.html">TQImage</a> or <a href="tqpixmap.html">TQPixmap</a>.
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<p> Your new subclass must reimplement the <a href="#decode">decode</a>() function in order
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to process your new format.
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<p> New TQImageFormat objects are generated by new TQImageFormatType
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factories.
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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>int <a name="decode"></a>TQImageFormat::decode ( <a href="tqimage.html">TQImage</a> & img, <a href="tqimageconsumer.html">TQImageConsumer</a> * consumer, const uchar * buffer, int length )<tt> [pure virtual]</tt>
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</h3>
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<p> New subclasses must reimplement this method.
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<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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to inform that consumer of changes to the image. The length of the
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data is given in <em>length</em>. The consumer may be 0, in which case
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the function should just process the data into <em>img</em> without
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telling any consumer about the changes. Note that the decoder must
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store enough state to be able to continue in subsequent calls to
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this method - this is the essence of the incremental image
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loading.
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<p> The function should return without processing all the data if it
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reaches the end of a frame in the input.
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<p> The function must return the number of bytes it has processed.
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