| author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
| Tue, 06 Jul 2010 15:10:48 +0300 | |
| changeset 30 | 5dc02b23752f |
| parent 0 | 1918ee327afb |
| permissions | -rw-r--r-- |
| 0 | 1 |
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Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
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<title>TIFFReadScanline</title> |
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<h1 align=center>TIFFReadScanline</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="#BUGS">BUGS</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>TIFFReadScanline − read and decode a scanline 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 TIFFReadScanline(TIFF *</b><i>tif</i><b>, |
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tdata_t</b> <i>buf</i><b>, uint32</b> <i>row</i><b>, |
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tsample_t</b> <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>Read the data for the specified row into the (user |
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supplied) data buffer <i>buf</i>. The data are returned |
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decompressed and, in the native byte- and bit-ordering, but |
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are otherwise packed (see further below). The buffer must be |
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large enough to hold an entire scanline of data. |
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Applications should call the routine <i>TIFFScanlineSize</i> |
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to find out the size (in bytes) of a scanline buffer. The |
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<i>row</i> parameter is always used by |
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<i>TIFFReadScanline</i>; the <i>sample</i> parameter is used |
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only if data are organized in separate planes |
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(<i>PlanarConfiguration</i>=2).</p> |
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</table> |
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<a name="NOTES"></a> |
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<h2>NOTES</h2> |
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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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<p>In C++ the <i>sample</i> parameter defaults to 0.</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><i>TIFFReadScanline</i> returns −1 if it detects an |
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error; otherwise 1 is returned.</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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<i>TIFFError</i>(3TIFF) routine.</p> |
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<p><b>Compression algorithm does not support random |
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access</b>. Data was requested in a non-sequential order |
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from a file that uses a compression algorithm and that has |
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<i>RowsPerStrip</i> greater than one. That is, data in the |
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image is stored in a compressed form, and with multiple rows |
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packed into a strip. In this case, the library does not |
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support random access to the data. The data should either be |
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accessed sequentially, or the file should be converted so |
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that each strip is made up of one row of data.</p> |
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</table> |
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<a name="BUGS"></a> |
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<h2>BUGS</h2> |
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<p>Reading subsampled YCbCR data does not work correctly |
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because, for <i>PlanarConfiguration</i>=2 the size of a |
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scanline is not calculated on a per-sample basis, and for |
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<i>PlanarConfiguration</i>=1 the library does not unpack the |
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block-interleaved samples; use the strip- and tile-based |
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interfaces to read these formats.</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), |
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<b>TIFFReadEncodedStrip</b>(3TIFF), |
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<b>TIFFReadRawStrip</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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<hr> |
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</body> |
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