2011-08-02 10:09:43 -04:00
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.\" $Id: TIFFcodec.3tiff,v 1.3 2011-08-02 14:09:43 bfriesen Exp $
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2004-11-11 09:39:16 -05:00
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.\"
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.\" Copyright (c) 1995 Sam Leffler
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.\" Copyright (c) 1995 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 CODEC 3TIFF "October 29, 2004" "libtiff"
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.SH NAME
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TIFFFindCODEC, TIFFRegisterCODEC, TIFFUnRegisterCODEC, TIFFIsCODECConfigured
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\- codec-related utility routines
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.SH SYNOPSIS
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.B "#include <tiffio.h>"
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.sp
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.BI "const TIFFCodec* TIFFFindCODEC(uint16 " scheme ");"
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.br
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.BI "TIFFCodec* TIFFRegisterCODEC(uint16 " scheme ", const char *" method ", TIFFInitMethod " init ");"
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.br
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.BI "void TIFFUnRegisterCODEC(TIFFCodec *" codec ");"
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.br
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.BI "int TIFFIsCODECConfigured(uint16 " scheme ");"
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.SH DESCRIPTION
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.I libtiff
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supports a variety of compression schemes implemented by software
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.IR codecs .
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Each codec adheres to a modular interface that provides for
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the decoding and encoding of image data; as well as some other
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methods for initialization, setup, cleanup, and the control
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of default strip and tile sizes.
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Codecs are identified by the associated value of the
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.SM TIFF
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.I Compression
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tag; e.g. 5 for
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.SM LZW
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compression.
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.PP
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The
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.I TIFFRegisterCODEC
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routine can be used to
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augment or override the set of codecs available to an application.
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If the specified
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.I scheme
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already has a registered codec then it is
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.I overridden
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and any images with data encoded with this
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2011-08-02 10:09:43 -04:00
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compression scheme will be decoded using the supplied codec.
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2004-11-11 09:39:16 -05:00
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.PP
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.I TIFFIsCODECConfigured
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returns 1 if the codec is configured and working. Otherwise 0 will be returned.
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.SH DIAGNOSTICS
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.BR "No space to register compression scheme %s" .
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.I TIFFRegisterCODEC
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was unable to allocate memory for the data structures needed
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to register a codec.
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.PP
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.BR "Cannot remove compression scheme %s; not registered" .
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.I TIFFUnRegisterCODEC
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did not locate the specified codec in the table of registered
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compression schemes.
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.SH "SEE ALSO"
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2005-11-02 06:07:18 -05:00
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.BR libtiff (3TIFF)
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.PP
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Libtiff library home page:
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.BR http://www.remotesensing.org/libtiff/
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