74 lines
2.8 KiB
Plaintext
74 lines
2.8 KiB
Plaintext
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.\" $Id: TIFFReadEncodedTile.3tiff,v 1.1 2004-11-11 14:39:16 dron Exp $
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.\"
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.\" Copyright (c) 1988-1997 Sam Leffler
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.\" Copyright (c) 1991-1997 Silicon Graphics, Inc.
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.\"
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.\" Permission to use, copy, modify, distribute, and sell this software and
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.\" its documentation for any purpose is hereby granted without fee, provided
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.\" that (i) the above copyright notices and this permission notice appear in
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.\" all copies of the software and related documentation, and (ii) the names of
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.\" Sam Leffler and Silicon Graphics may not be used in any advertising or
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.\" publicity relating to the software without the specific, prior written
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.\" permission of Sam Leffler and Silicon Graphics.
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.\"
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.\" THE SOFTWARE IS PROVIDED "AS-IS" AND WITHOUT WARRANTY OF ANY KIND,
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.\" EXPRESS, IMPLIED OR OTHERWISE, INCLUDING WITHOUT LIMITATION, ANY
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.\" WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.
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.\"
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.\" IN NO EVENT SHALL SAM LEFFLER OR SILICON GRAPHICS BE LIABLE FOR
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.\" ANY SPECIAL, INCIDENTAL, INDIRECT OR CONSEQUENTIAL DAMAGES OF ANY KIND,
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.\" OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
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.\" WHETHER OR NOT ADVISED OF THE POSSIBILITY OF DAMAGE, AND ON ANY THEORY OF
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.\" LIABILITY, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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.\" OF THIS SOFTWARE.
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.\"
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.if n .po 0
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.TH TIFFReadEncodedTile 3TIFF "October 15, 1995" "libtiff"
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.SH NAME
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TIFFReadEncodedTile \- read and decode a tile of data from an open
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.SM TIFF
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file
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.SH SYNOPSIS
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.B "#include <tiffio.h>"
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.sp
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.BI "int TIFFReadEncodedTile(TIFF *" tif ", u_long " tile ", u_char *" buf ", u_long " size ")"
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.SH DESCRIPTION
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Read the specified tile of data and place up to
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.I size
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bytes of decompressed information in the (user supplied) data buffer.
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.SH NOTES
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The value of
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.I tile
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is a ``raw tile number.''
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That is, the caller must take into account whether or not the data are
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organized in separate planes (\c
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.IR PlanarConfiguration =2).
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.IR TIFFComputeTile
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automatically does this when converting an (x,y,z,sample) coordinate quadruple
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to a tile number. To read a full tile of data the data buffer should be at
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least as large as the value returned by
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.IR TIFFTileSize .
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.PP
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The library attempts to hide bit- and byte-ordering differences between the
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image and the native machine by converting data to the native machine order.
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Bit reversal is done if the
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.I FillOrder
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tag is opposite to the native machine bit order. 16- and 32-bit samples are
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automatically byte-swapped if the file was written with a byte order opposite
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to the native machine byte order,
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.SH "RETURN VALUES"
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The actual number of bytes of data that were placed in
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.I buf
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is returned;
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.IR TIFFReadEncodedTile
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returns \-1 if an error was encountered.
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.SH DIAGNOSTICS
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All error messages are directed to the
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.IR TIFFError (3TIFF)
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routine.
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.SH "SEE ALSO"
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.IR libtiff (3TIFF),
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.IR TIFFOpen (3TIFF),
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.IR TIFFReadRawTile (3TIFF),
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.IR TIFFReadTile (3TIFF)
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