c3402403ea
be used if build directory is not the same as source directory.
* man/{TIFFGetField.3tiff, man/TIFFSetField.3tiff}: Documented
TIFFTAG_PHOTOSHOP, TIFFTAG_RICHTIFFIPTC, and TIFFTAG_XMLPACKET,
and re-sorted tag names in alphabetical order.
141 lines
4.3 KiB
HTML
141 lines
4.3 KiB
HTML
<!-- Creator : groff version 1.19.2 -->
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<!-- CreationDate: Mon Jan 2 17:41:43 2006 -->
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"
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"http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII">
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<meta name="Content-Style" content="text/css">
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<style type="text/css">
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p { margin-top: 0; margin-bottom: 0; }
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pre { margin-top: 0; margin-bottom: 0; }
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table { margin-top: 0; margin-bottom: 0; }
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</style>
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<title>TIFFReadScanline</title>
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</head>
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<body>
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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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<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">TIFFReadScanline
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− read and decode a scanline 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>int
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TIFFReadScanline(TIFF *</b><i>tif</i><b>, tdata_t</b>
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<i>buf</i><b>, uint32</b> <i>row</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">Read the data
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for the specified row into the (user supplied) data buffer
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<i>buf</i>. The data are returned decompressed and, in the
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native byte- and bit-ordering, but are otherwise packed (see
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further below). The buffer must be large enough to hold an
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entire scanline of data. Applications should call the
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routine <i>TIFFScanlineSize</i> to find out the size (in
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bytes) of a scanline buffer. The <i>row</i> parameter is
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always used by <i>TIFFReadScanline</i>; the <i>sample</i>
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parameter is used only if data are organized in separate
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planes (<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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<p style="margin-left:11%; margin-top: 1em">In C++ the
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<i>sample</i> parameter defaults to 0.</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>TIFFReadScanline</i>
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returns −1 if it detects an error; otherwise 1 is
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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 <i>TIFFError</i>(3TIFF)
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routine.</p>
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<p style="margin-left:11%; margin-top: 1em"><b>Compression
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algorithm does not support random access</b>. Data was
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requested in a non-sequential order from a file that uses a
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compression algorithm and that has <i>RowsPerStrip</i>
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greater than one. That is, data in the image is stored in a
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compressed form, and with multiple rows packed into a strip.
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In this case, the library does not support random access to
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the data. The data should either be accessed sequentially,
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or the file should be converted so that each strip is made
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up of one row of data.</p>
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<a name="BUGS"></a>
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<h2>BUGS</h2>
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<p style="margin-left:11%; margin-top: 1em">Reading
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subsampled YCbCR data does not work correctly because, for
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<i>PlanarConfiguration</i>=2 the size of a scanline is not
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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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<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>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 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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<hr>
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</body>
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</html>
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