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TIFFReadEncodedTile.3tiff.html
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TIFFReadEncodedTile.3tiff.html
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<!-- Creator : groff version 1.18.1 -->
<!-- CreationDate: Sat Feb 24 18:37:17 2007 -->
<html>
<head>
<meta name="generator" content="groff -Thtml, see www.gnu.org">
<meta name="Content-Style" content="text/css">
<title>TIFFReadEncodedTile</title>
</head>
<body>
<h1 align=center>TIFFReadEncodedTile</h1>
<a href="#NAME">NAME</a><br>
<a href="#SYNOPSIS">SYNOPSIS</a><br>
<a href="#DESCRIPTION">DESCRIPTION</a><br>
<a href="#NOTES">NOTES</a><br>
<a href="#RETURN VALUES">RETURN VALUES</a><br>
<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
<a href="#SEE ALSO">SEE ALSO</a><br>
<hr>
<a name="NAME"></a>
<h2>NAME</h2>
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<p>TIFFReadEncodedTile − read and decode a tile of
data from an open <small>TIFF</small> file</p>
</td>
</table>
<a name="SYNOPSIS"></a>
<h2>SYNOPSIS</h2>
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<p><b>#include <tiffio.h></b></p>
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<p><b>int TIFFReadEncodedTile(TIFF *</b><i>tif</i><b>,
ttile_t</b> <i>tile</i><b>, tdata_t</b> <i>buf</i><b>,
tsize_t</b> <i>size</i><b>)</b></p>
</td>
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<a name="DESCRIPTION"></a>
<h2>DESCRIPTION</h2>
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<p>Read the specified tile of data and place up to
<i>size</i> bytes of decompressed information in the (user
supplied) data buffer.</p>
</td>
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<a name="NOTES"></a>
<h2>NOTES</h2>
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<p>The value of <i>tile</i> is a ‘‘raw tile
number.’’ That is, the caller must take into
account whether or not the data are organized in separate
planes (<i>PlanarConfiguration</i>=2).
<i>TIFFComputeTile</i> automatically does this when
converting an (x,y,z,sample) coordinate quadruple to a tile
number. To read a full tile of data the data buffer should
be at least as large as the value returned by
<i>TIFFTileSize</i>.</p>
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<p>The library attempts to hide bit- and byte-ordering
differences between the image and the native machine by
converting data to the native machine order. Bit reversal is
done if the <i>FillOrder</i> tag is opposite to the native
machine bit order. 16- and 32-bit samples are automatically
byte-swapped if the file was written with a byte order
opposite to the native machine byte order,</p>
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<a name="RETURN VALUES"></a>
<h2>RETURN VALUES</h2>
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<p>The actual number of bytes of data that were placed in
<i>buf</i> is returned; <i>TIFFReadEncodedTile</i> returns
−1 if an error was encountered.</p>
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<a name="DIAGNOSTICS"></a>
<h2>DIAGNOSTICS</h2>
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<p>All error messages are directed to the
<b>TIFFError</b>(3TIFF) routine.</p>
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<a name="SEE ALSO"></a>
<h2>SEE ALSO</h2>
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<p><b>TIFFOpen</b>(3TIFF), <b>TIFFReadRawTile</b>(3TIFF),
<b>TIFFReadTile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
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<p>Libtiff library home page:
<b>http://www.remotesensing.org/libtiff/</b></p>
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