.\" $Id: TIFFReadEncodedTile.3tiff,v 1.4 2016-09-25 20:05:50 bfriesen 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

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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND, 

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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.  

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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR

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.\" OF THIS SOFTWARE.

.\"

.if n .po 0

.TH TIFFReadEncodedTile 3TIFF "October 13, 2006" "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 ", ttile_t " tile ", tdata_t " buf ", tsize_t " 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.simplesystems.org/libtiff/