tiffreadrawtile.3t

tiff文件开发库

.\" $Header: /cvsroot/osrs/libtiff/man/TIFFReadRawTile.3t,v 1.1.1.1 1999/07/27 21:50:27 mike Exp $
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.\" Copyright (c) 1988-1997 Sam Leffler
.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.if n .po 0
.TH TIFFReadRawTile 3T "October 15, 1995"
.SH NAME
TIFFReadRawTile \- return an undecoded tile of data from an open
.SM TIFF
file
.SH SYNOPSIS
.B "#include <tiffio.h>"
.br
.B "tsize_t TIFFReadRawTile(TIFF* tif, ttile_t tile, tdata_t buf, tsize_t size)"
.SH DESCRIPTION
Read the contents of the specified tile into the
(user supplied) data buffer.
Note that the value of
.I tile
is a ``raw tile number.''
That is, the caller must take into account whether or not the
data is organized in separate planes (\c
.IR PlanarConfiguration =2).
.I 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 typically be
at least as large as the value returned by
.IR TIFFTileSize .
.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
.IR TIFFError (3T)
routine.
.SH "SEE ALSO"
.IR libtiff (3T),
.IR TIFFOpen (3T),
.IR TIFFReadEncodedTile (3T),
.IR TIFFReadTile (3T),
.IR TIFFTileSize (3T)