.\" $Id: TIFFReadTile.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 TIFFReadTile 3TIFF "December 16, 1991" "libtiff"

.SH NAME

TIFFReadTile \- read and decode a tile of data from an open

.SM TIFF

file

.SH SYNOPSIS

.B "#include <tiffio.h>"

.sp

.BI "tsize_t TIFFReadTile(TIFF *" tif ", tdata_t " buf ", uint32 " x ", uint32 " y ", uint32 " z ", tsample_t " sample ")"

.SH DESCRIPTION

Return the data for the tile

.I containing

the specified coordinates. The data placed in

.I buf

are returned decompressed and, typically, in the native byte- and

bit-ordering, but are otherwise packed (see further below). The buffer must be

large enough to hold an entire tile of data. Applications should call the

routine

.IR TIFFTileSize

to find out the size (in bytes) of a tile buffer. The

.I x

and

.I y

parameters are always used by

.IR TIFFReadTile .

The

.I z

parameter is used if the image is deeper than 1 slice (\c

.IR ImageDepth >1).

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,

.SH "RETURN VALUES"

.IR TIFFReadTile

returns \-1 if it detects an error; otherwise the number of bytes in the

decoded tile is returned.

.SH DIAGNOSTICS

All error messages are directed to the

.BR TIFFError (3TIFF)

routine.

.SH "SEE ALSO"

.BR TIFFCheckTile (3TIFF),

.BR TIFFComputeTile (3TIFF),

.BR TIFFOpen (3TIFF),

.BR TIFFReadEncodedTile (3TIFF),

.BR TIFFReadRawTile (3TIFF),

.BR libtiff (3TIFF)

.PP

Libtiff library home page:

.BR http://www.remotesensing.org/libtiff/