77 lines
2.8 KiB
Plaintext
77 lines
2.8 KiB
Plaintext
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.\" $Header: /cvs/maptools/cvsroot/libtiff/man/Attic/TIFFReadEncodedTile.3t,v 1.1 1999-07-27 21:50:27 mike 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 3T "October 15, 1995"
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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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.br
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.B "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
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data are 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)
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coordinate quadruple to a tile number.
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To read a full tile of data the data buffer should be
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at 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
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between the image and the native machine by converting data
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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.
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16- and 32-bit samples are automatically byte-swapped if the
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file was written with a byte order opposite to the native
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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 (3T)
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routine.
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.SH "SEE ALSO"
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.IR libtiff (3T),
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.IR TIFFOpen (3T),
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.IR TIFFReadRawTile (3T),
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.IR TIFFReadTile (3T)
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