.\" $Id: TIFFReadEncodedTile.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
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 
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.\"
.if n .po 0
.TH TIFFReadEncodedTile 3TIFF "October 15, 1995" "libtiff"
.SH NAME
TIFFReadEncodedTile \- read and decode a tile of data from an open
.SM TIFF
file
.SH SYNOPSIS
.B "#include <tiffio.h>"
.sp
.BI "int TIFFReadEncodedTile(TIFF *" tif ", u_long " tile ", u_char *" buf ", u_long " size ")"
.SH DESCRIPTION
Read the specified tile of data and place up to
.I size
bytes of decompressed information in the (user supplied) data buffer.
.SH NOTES
The value of
.I tile
is a ``raw tile number.''
That is, the caller must take into account whether or not the data are
organized in separate planes (\c
.IR PlanarConfiguration =2).
.IR TIFFComputeTile
automatically does this when converting an (x,y,z,sample) coordinate quadruple
to a tile number. To read a full tile of data the data buffer should be at
least as large as the value returned by
.IR TIFFTileSize .
.PP
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,
.SH "RETURN VALUES"
The actual number of bytes of data that were placed in
.I buf
is returned;
.IR TIFFReadEncodedTile
returns \-1 if an error was encountered.
.SH DIAGNOSTICS
All error messages are directed to the
.BR TIFFError (3TIFF)
routine.
.SH "SEE ALSO"
.BR TIFFOpen (3TIFF),
.BR TIFFReadRawTile (3TIFF),
.BR TIFFReadTile (3TIFF),
.BR libtiff (3TIFF)
.PP
Libtiff library home page:
.BR http://www.remotesensing.org/libtiff/