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<meta name="generator" content="groff -Thtml, see www.gnu.org">
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<meta name="Content-Style" content="text/css">
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<title>TIFFReadScanline</title>
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TIFFReadScanline
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NAME
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SYNOPSIS
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DESCRIPTION
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NOTES
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RETURN VALUES
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DIAGNOSTICS
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BUGS
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SEE ALSO
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NAME
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TIFFReadScanline − read and decode a scanline of
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data from an open <small>TIFF</small> file
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SYNOPSIS
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#include <tiffio.h>
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int TIFFReadScanline(TIFF *tif,
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tdata_t buf, uint32 row,
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tsample_t sample)
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DESCRIPTION
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cols="2" cellspacing="0" cellpadding="0">
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Read the data for the specified row into the (user
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supplied) data buffer buf. 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 TIFFScanlineSize
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to find out the size (in bytes) of a scanline buffer. The
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row parameter is always used by
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TIFFReadScanline; the sample parameter is used
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only if data are organized in separate planes
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(PlanarConfiguration=2).
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NOTES
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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 FillOrder 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,
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In C++ the sample parameter defaults to 0.
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RETURN VALUES
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TIFFReadScanline returns −1 if it detects an
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error; otherwise 1 is returned.
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DIAGNOSTICS
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All error messages are directed to the
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TIFFError(3TIFF) routine.
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Compression algorithm does not support random
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access. 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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RowsPerStrip 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.
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BUGS
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Reading subsampled YCbCR data does not work correctly
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because, for PlanarConfiguration=2 the size of a
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scanline is not calculated on a per-sample basis, and for
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PlanarConfiguration=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.
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SEE ALSO
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TIFFOpen(3TIFF),
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TIFFReadEncodedStrip(3TIFF),
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TIFFReadRawStrip(3TIFF), libtiff(3TIFF)
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Libtiff library home page:
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http://www.simplesystems.org/libtiff/
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</body>
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</html>
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