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+.\" $Id: TIFFReadScanline.3tiff,v 1.2 2005-11-02 11:07:18 dron Exp $
+.\"
+.\" Copyright (c) 1988-1997 Sam Leffler
+.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
+.\"
+.\" Permission to use, copy, modify, distribute, and sell this software and 
+.\" its documentation for any purpose is hereby granted without fee, provided
+.\" that (i) the above copyright notices and this permission notice appear in
+.\" all copies of the software and related documentation, and (ii) the names of
+.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
+.\" publicity relating to the software without the specific, prior written
+.\" permission of Sam Leffler and Silicon Graphics.
+.\" 
+.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
+.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY 
+.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  
+.\" 
+.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
+.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
+.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
+.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF 
+.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE 
+.\" OF THIS SOFTWARE.
+.\"
+.if n .po 0
+.TH TIFFReadScanline 3TIFF "October 15, 1995" "libtiff"
+.SH NAME
+TIFFReadScanline \- read and decode a scanline of data from an open
+.SM TIFF
+file
+.SH SYNOPSIS
+.B "#include <tiffio.h>"
+.sp
+.BI "int TIFFReadScanline(TIFF *" tif ", tdata_t " buf ", uint32 " row ", tsample_t " sample ")"
+.SH DESCRIPTION
+Read the data for the specified row into the (user supplied) data buffer
+.IR buf .
+The data are returned decompressed and, in the native byte- and bit-ordering,
+but are otherwise packed (see further below). The buffer must be large enough
+to hold an entire scanline of data. Applications should call the routine
+.IR TIFFScanlineSize
+to find out the size (in bytes) of a scanline buffer.
+The
+.I row
+parameter is always used by
+.IR TIFFReadScanline ;
+the
+.I sample
+parameter is used only if data are organized in separate planes (\c
+.IR PlanarConfiguration =2).
+.SH NOTES
+The library attempts to hide bit- and byte-ordering differences between the
+image and the native machine by converting data to the native machine order.
+Bit reversal is done if the
+.I FillOrder
+tag is opposite to the native machine bit order. 16- and 32-bit samples are
+automatically byte-swapped if the file was written with a byte order opposite
+to the native machine byte order,
+.PP
+In C++ the
+.I sample
+parameter defaults to 0.
+.SH "RETURN VALUES"
+.IR TIFFReadScanline
+returns \-1 if it detects an error; otherwise 1 is returned.
+.SH DIAGNOSTICS
+All error messages are directed to the
+.IR TIFFError (3TIFF)
+routine.
+.PP
+.BR "Compression algorithm does not support random access" .
+Data was requested in a non-sequential order from a file that uses a
+compression algorithm and that has
+.I RowsPerStrip
+greater than one.
+That is, data in the image is stored in a compressed form, and with multiple
+rows packed into a strip. In this case, the library does not support random
+access to the data. The data should either be accessed sequentially, or the
+file should be converted so that each strip is made up of one row of data.
+.SH BUGS
+Reading subsampled YCbCR data does not work correctly because, for 
+.IR PlanarConfiguration =2
+the size of a scanline is not calculated on a per-sample basis, and for
+.IR PlanarConfiguration =1
+the library does not unpack the block-interleaved samples; use the strip- and
+tile-based interfaces to read these formats.
+.SH "SEE ALSO"
+.BR TIFFOpen (3TIFF),
+.BR TIFFReadEncodedStrip (3TIFF),
+.BR TIFFReadRawStrip (3TIFF),
+.BR libtiff (3TIFF)
+.PP
+Libtiff library home page:
+.BR http://www.remotesensing.org/libtiff/