src/tiff/man/TIFFcodec.3tiff

   1 .\" $Id: TIFFcodec.3tiff,v 1.2 2005/11/02 11:07:18 dron Exp $
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   3 .\" Copyright (c) 1995 Sam Leffler
   4 .\" Copyright (c) 1995 Silicon Graphics, Inc.
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  25 .if n .po 0
  26 .TH CODEC 3TIFF "October 29, 2004" "libtiff"
  27 .SH NAME
  28 TIFFFindCODEC, TIFFRegisterCODEC, TIFFUnRegisterCODEC, TIFFIsCODECConfigured
  29 \- codec-related utility routines
  30 .SH SYNOPSIS
  31 .B "#include <tiffio.h>"
  32 .sp
  33 .BI "const TIFFCodec* TIFFFindCODEC(uint16 " scheme ");"
  34 .br
  35 .BI "TIFFCodec* TIFFRegisterCODEC(uint16 " scheme ", const char *" method ", TIFFInitMethod " init ");"
  36 .br
  37 .BI "void TIFFUnRegisterCODEC(TIFFCodec *" codec ");"
  38 .br
  39 .BI "int TIFFIsCODECConfigured(uint16 " scheme ");"
  40 .SH DESCRIPTION
  41 .I libtiff
  42 supports a variety of compression schemes implemented by software
  43 .IR codecs .
  44 Each codec adheres to a modular interface that provides for
  45 the decoding and encoding of image data; as well as some other
  46 methods for initialization, setup, cleanup, and the control
  47 of default strip and tile sizes.
  48 Codecs are identified by the associated value of the
  49 .SM TIFF
  50 .I Compression
  51 tag; e.g. 5 for
  52 .SM LZW
  53 compression.
  54 .PP
  55 The
  56 .I TIFFRegisterCODEC
  57 routine can be used to
  58 augment or override the set of codecs available to an application.
  59 If the specified
  60 .I scheme
  61 already has a registered codec then it is
  62 .I overridden
  63 and any images with data encoded with this
  64 compression scheme will be decoded using the supplied coded.
  65 .PP
  66 .I TIFFIsCODECConfigured
  67 returns 1 if the codec is configured and working. Otherwise 0 will be returned.
  68 .SH DIAGNOSTICS
  69 .BR "No space to register compression scheme %s" .
  70 .I TIFFRegisterCODEC
  71 was unable to allocate memory for the data structures needed
  72 to register a codec.
  73 .PP
  74 .BR "Cannot remove compression scheme %s; not registered" .
  75 .I TIFFUnRegisterCODEC
  76 did not locate the specified codec in the table of registered
  77 compression schemes.
  78 .SH "SEE ALSO"
  79 .BR libtiff (3TIFF)
  80 .PP
  81 Libtiff library home page:
  82 .BR http://www.remotesensing.org/libtiff/