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<title>TIFFReadTile</title>
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</head>
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<body>
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<h1 align=center>TIFFReadTile</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 style="margin-left:11%; margin-top: 1em">TIFFReadTile
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− read and decode a tile of data from an open
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<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 style="margin-left:11%; margin-top: 1em"><b>#include
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<tiffio.h></b></p>
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<p style="margin-left:11%; margin-top: 1em"><b>tsize_t
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TIFFReadTile(TIFF *</b><i>tif</i><b>, tdata_t</b>
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<i>buf</i><b>, uint32</b> <i>x</i><b>, uint32</b>
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<i>y</i><b>, uint32</b> <i>z</i><b>, tsample_t</b>
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<i>sample</i><b>)</b></p>
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<a name="DESCRIPTION"></a>
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<h2>DESCRIPTION</h2>
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<p style="margin-left:11%; margin-top: 1em">Return the data
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for the tile <i>containing</i> the specified coordinates.
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The data placed in <i>buf</i> are returned decompressed and,
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typically, in the native byte- and bit-ordering, but are
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otherwise packed (see further below). The buffer must be
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large enough to hold an entire tile of data. Applications
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should call the routine <i>TIFFTileSize</i> to find out the
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size (in bytes) of a tile buffer. The <i>x</i> and <i>y</i>
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parameters are always used by <i>TIFFReadTile</i>. The
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<i>z</i> parameter is used if the image is deeper than 1
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slice (<i>ImageDepth</i>>1). The <i>sample</i> parameter
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is used only if data are organized in separate planes
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(<i>PlanarConfiguration</i>=2).</p>
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<a name="NOTES"></a>
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<h2>NOTES</h2>
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<p style="margin-left:11%; margin-top: 1em">The library
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attempts to hide bit- and byte-ordering differences between
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the image and the native machine by converting data to the
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native machine order. Bit reversal is done if the
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<i>FillOrder</i> tag is opposite to the native machine bit
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order. 16- and 32-bit samples are automatically byte-swapped
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if the file was written with a byte order opposite to the
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native machine byte order,</p>
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<a name="RETURN VALUES"></a>
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<h2>RETURN VALUES</h2>
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<p style="margin-left:11%; margin-top: 1em"><i>TIFFReadTile</i>
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returns −1 if it detects an error; otherwise the
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number of bytes in the decoded tile is returned.</p>
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<a name="DIAGNOSTICS"></a>
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<h2>DIAGNOSTICS</h2>
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<p style="margin-left:11%; margin-top: 1em">All error
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messages are directed to the <b>TIFFError</b>(3TIFF)
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routine.</p>
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2005-03-06 06:11:43 -05:00
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<a name="SEE ALSO"></a>
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<h2>SEE ALSO</h2>
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<p style="margin-left:11%; margin-top: 1em"><b>TIFFCheckTile</b>(3TIFF),
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<b>TIFFComputeTile</b>(3TIFF), <b>TIFFOpen</b>(3TIFF),
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<b>TIFFReadEncodedTile</b>(3TIFF),
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<b>TIFFReadRawTile</b>(3TIFF), <b>libtiff</b>(3TIFF)</p>
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<p style="margin-left:11%; margin-top: 1em">Libtiff library
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home page: <b>http://www.remotesensing.org/libtiff/</b></p>
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