| author | William Roberts <williamr@symbian.org> |
| Thu, 22 Jul 2010 16:41:55 +0100 | |
| branch | GCC_SURGE |
| changeset 31 | 5daf16870df6 |
| parent 30 | 5dc02b23752f |
| permissions | -rw-r--r-- |
| 0 | 1 |
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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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<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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ttile_t</b> <i>tile</i><b>, tdata_t</b> <i>buf</i><b>, |
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tsize_t</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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<a name="NOTES"></a> |
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<h2>NOTES</h2> |
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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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<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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<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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<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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