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<!-- CreationDate: Mon Mar 13 18:03:09 2006 -->
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<title>TIFFReadEncodedTile</title>
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<h1 align=center>TIFFReadEncodedTile</h1>
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<a href="#NAME">NAME</a><br>
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<a href="#SYNOPSIS">SYNOPSIS</a><br>
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<a href="#DESCRIPTION">DESCRIPTION</a><br>
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<a href="#NOTES">NOTES</a><br>
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<a href="#RETURN VALUES">RETURN VALUES</a><br>
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<a href="#DIAGNOSTICS">DIAGNOSTICS</a><br>
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<a href="#SEE ALSO">SEE ALSO</a><br>
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<hr>
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<a name="NAME"></a>
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<h2>NAME</h2>
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<p>TIFFReadEncodedTile − read and decode a tile of
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data from an open <small>TIFF</small> file</p>
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<a name="SYNOPSIS"></a>
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<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>,
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u_long</b> <i>tile</i><b>, u_char *</b><i>buf</i><b>,
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u_long</b> <i>size</i><b>)</b></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p>Read the specified tile of data and place up to
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<i>size</i> bytes of decompressed information in the (user
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supplied) data buffer.</p>
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</td>
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</table>
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<td width="8%"></td>
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<td width="91%">
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<p>The value of <i>tile</i> is a ‘‘raw tile
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number.’’ That is, the caller must take into
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account whether or not the data are organized in separate
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planes (<i>PlanarConfiguration</i>=2).
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<i>TIFFComputeTile</i> automatically does this when
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converting an (x,y,z,sample) coordinate quadruple to a tile
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number. To read a full tile of data the data buffer should
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be at least as large as the value returned by
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<i>TIFFTileSize</i>.</p>
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<p>The library attempts to hide bit- and byte-ordering
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differences between the image and the native machine by
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converting data to the native machine order. Bit reversal is
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done if the <i>FillOrder</i> tag is opposite to the native
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machine bit order. 16- and 32-bit samples are automatically
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byte-swapped if the file was written with a byte order
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opposite to the native machine byte order,</p>
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</td>
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</table>
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<a name="RETURN VALUES"></a>
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<h2>RETURN VALUES</h2>
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<p>The actual number of bytes of data that were placed in
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<i>buf</i> is returned; <i>TIFFReadEncodedTile</i> returns
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−1 if an error was encountered.</p>
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</td>
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</table>
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<a name="DIAGNOSTICS"></a>
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<h2>DIAGNOSTICS</h2>
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<p>All error messages are directed to the
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<b>TIFFError</b>(3TIFF) routine.</p>
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</td>
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</table>
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<p><b>TIFFOpen</b>(3TIFF), <b>TIFFReadRawTile</b>(3TIFF),
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<b>TIFFReadTile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
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<p>Libtiff library home page:
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<b>http://www.remotesensing.org/libtiff/</b></p>
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</td>
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</table>
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