SN: Fixed inlcudes for EMX, commented out lines like "cout << something;"

[wxWidgets.git] / src / xpm / changes

/*
 * Copyright (C) 1989-94 GROUPE BULL
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to
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/**************************************************************************\
*                                                                          *
*                       HISTORY of user-visible changes                    *
*                                                                          *
\**************************************************************************/

3.4b    (94/05/24)

    ENHANCEMENTS:
        - XPM can now be built under MS Windows. Yes, this is possible and this
          entirely comes from:
                - Hermann Dunkel <hedu@cul-ipn.uni-kiel.de>
          See the README.MSW file for details.

        - building the shared library now depends on the SharedLibXpm variable
          and no longer on the SharedLibX variable which is private to the X
          Window System project.
                - patch from Stephen Gildea <gildea@x.org>
          Other variables can now be set for the various locations needed.

        - lib/parse.c does no longer use a 256x256 array in the stack but
          malloc it instead.

        - The Copyright notice which has been re-written from the X11R6's one
          should be clearer and is now present in every file.

    BUGS CORRECTED:
        - lib/xpmP.h does no longer define a Boolean type which conflicts with
          the Intrinsic definition. Instead the type Bool defined in Xlib is
          used.
                - neumann@watson.ibm.com (Gustaf Neumann)

3.4a    (94/03/29)

    BUGS CORRECTED:
        - passing NULL as shapemask_return to XpmReadFileToPixmap and similar
          functions was leading to a bus error.
                - Dean Luick <dean@falcon.natinst.com>

3.4     (94/03/14)

    IMPORTANT NOTE:
        This version is not compatible with 3.3. Fortunately most people should
        only need to recompile.
        I apology for this but CDE/Motif have put heavy pressure to go that
        way. The point is that I designed and released Xpm 3.3 in order to let
        OSF include a clean version of Xpm in Motif 2.0. This new version was
        not fully compatible with 3.2 but I thought it didn't matter since this
        was going to be the first version used within Motif. Unfortunately CDE
        was already using xpm-3.2 internally and requires both source and
        binary backward compatibility. By the way I must say they didn't drop
        us a single line to let us know they were using it and thus were
        expecting stability. All this could have been avoided...

        However, since I had to go for a not compatible version I took this as
        an opportunity to modify the lower level API, which was new in 3.3 and
        which was somewhat clumsy, in order to provide yet a better API.

        The library has been modified to have both source and binary backward
        compatibility with xpm-3.2. This implies it is not either source or
        binary compatible with 3.3. The fields related to the 3.2 XpmInfos
        mechanism have been put back into the XpmAttributes structure. The new
        3.3 XpmInfos struct has been renamed as XpmInfo to avoid conflict with
        the old 3.2 flag which is back too. All the semantic related to the
        XpmAttributes infos fields is back as well.

        So this new version provides a high level API which is fully
        compatible with 3.2 and still provides the 3.3 lower level API
        (XpmImage) with the XpmInfos struct renamed as XpmInfo. This leads to
        some redundancy but this was the best I could do to satisfy both
        CDE/Motif people who needed the backward compatibility and myself (who
        always tries to provide you with the best ;-).

        Tests have been successfully performed with pixmap-2.1, pixmap-2.4, and
        sxpm.

    ENHANCEMENTS:
        - The colorTable member of the XpmAttributes structure is now an
          (XpmColor*) in order to be compatible with an XpmImage colorTable.
          However in order to be backward compatible this field is cast to
          (XpmColor **), which is equivalent to (char ***), when it is used
          with the old flags XpmInfos and XpmReturnInfos. To handle the new
          type the new flags XpmColorTable and XpmReturnColorTable have been
          defined.
        - The XpmInfo struct has been extended to avoid having to deal with an
          XpmAttributes at the lower level. The idea is that all the data
          stored in an Xpm file can be retreive through both an XpmImage and
          an XpmInfo struct. See the documentation for details.
        - XpmUndefPixel is defined and exported by xpm.h in order to let
          clients providing their own colorTable when writting out an Xpm file.
          See the documentation for details.
        - in sxpm/sxpm.c, set attribute XtNinput to True on toplevel widget.
          Windows that don't "take" input, never get focus, as mandated by
          the ICCM.
                patch from Henrique Martins <martins@hplhasm.hpl.hp.com>
        - lib/Imakefile modified to build the shared library under IRIX 5.
                patch from simon@lia.di.epfl.ch (Simon Leinen)

    NEW FEATURES:
        - a new funtion and a new define should help client figuring out with
          which Xpm library version they are working. These are
          XpmIncludeVersion and XpmLibraryVersion().

3.3     (93/12/20)

    NEW FEATURES:
        - XPM1 files are now supported.
        - a new function is provided to get an error string related to the
          returned error code.
                - suggested by Detlef Schmier <detlef@mfr.dec.com>

    ENHANCEMENTS:
        - gzip and gunzip are called with the -q option (quiet)
                - patch from Chris P. Ross <cross@eng.umd.edu>
        - the parser is again more flexible about the way the strings are
          distributed on lines. Actually a single line XPM file can be read.
        - the documentation should be clearer about shapemask generation and
          XpmAttributes valuemask.

    BUGS CORRECTED:
        - reading some binary file was leading to a bus error.
                - patch from Detlef Schmier <detlef@mfr.dec.com>
        - the ? character is no longer used when writting an XPM file in order
          to avoid possible ANSI trigraphs.

3.3alpha (93/08/13)

    NEW FEATURES:
        - a new level interface is provided to allow applications to do either
          icon editing or data caching.
          The XpmAttributes has been changed but most applications will just
          need to be recompiled.
        - new structures are provided to deal with the new lower level:
                 XpmImage, XpmColor, XpmInfos.

        - a separate distribution called xpm-contrib is available. This
          includes the converters which used to be part of this distribution
          plus:
                two new appplications:
                * nexpm to draw a pixmap in *any* existing window from
                         Ralph Betza <gnohmon@ssiny.com>
                * xpmview to display a list of Xpm files from
                         Jean Michel Leon <leon@sophia.inria.fr>

                a hacky string to pixmap converter, provided by
                        Robert H. Forsman Jr.  <thoth@manatee.cis.ufl.edu>

                The Xpm editor called pixmap will also be part of this contrib.
                This does not mean it is the best pixmap editor one can find
                but it is the only one that I know of which tries to handle
                all the features of this format.

    ENHANCEMENTS:
        - the code to build XImage data has been optimized by
                 jules@x.co.uk (Julian Gosnell)
          the old code is still available when compiling with the
          -DWITHOUT_SPEEDUPS flag.

        - closecolor code was not re-entrant
                 - dbl@visual.com (David B. Lewis)
        - fix gzip filename (*.gz and no longer *.z).
                 - Jason Patterson <jasonp@fitmail.fit.qut.edu.au>
        - sxpm has 2 new options:
                 -nom to do not display the mask if there is one
                 -cp <color> <pixel> to override a color value with a given
                 pixel, i.e. sxpm plaid.xpm -cp red 4

          also the '-s' adn '-p' options have been renamed to '-sc' and '-sp'.

        - xpm.h defines XpmFormat, XpmVersion, and XpmRevision numbers.

    BUGS CORRECTED:
        - closecolor minor fix
                 - Jason Patterson <jasonp@fitmail.fit.qut.edu.au>

3.2g    (93/04/26)

    ENHANCEMENTS:
        - much faster close colors
        - piping from/to compressed files now handles GNU's gzip (.z)  format
        - added XpmColorKey attribute - ability to specify which visual's
          colors to use (ie: now it's possible to read in a pixmap in a
          color visual, but use the colors specified for monochrome).
        - added -mono, -grey4, -grey and -color options to sxpm to demonstrate
          the XpmColorKey attribute.
                - Jason Patterson <jasonp@fitmail.qut.edu.au>

    BUGS CORRECTED:
        - fixed bug where redefining "None" as a pixel stopped mask generation
        - minor SVR4 defines for <string.h>
        - fixed annoying closecolor bug related to read/write color cells
        - fixed minor bug in color value -> pixel overloading
        - manual updated to include new red/green/blue closeness attributes
                - Jason Patterson <jasonp@fitmail.qut.edu.au>

        - the top Imakefile was missing the depend target
        - sxpm/Imakefile fixed so that -L../lib is set before the standard
          library location.
                - Vivek Khera <khera@cs.duke.edu>

        - lib/xpmP.h now defines bcopy as memcpy for VMS (required by recent
          versions of VMS)
                - J. Daniel Smith <dsmith@ann-arbor.applicon.slb.com>

        - the lib/Imakefile didn't work with X11R4.


3.2f            (93/03/17)

    NEW FEATURES:
        - the library provides four new functions to deal with Xpm files
          loaded in memory as single character strings buffers:

                        XpmCreateImageFromBuffer
                        XpmCreatePixmapFromBuffer
                        XpmCreateBufferFromImage
                        XpmCreateBufferFromPixmap

        - in addition, as a convenience, two functions are provided to copy a
          file in a buffer and to write a file from a buffer:

                        XpmReadFileToBuffer
                        XpmWriteFileFromBuffer

    ENHANCEMENTS:
        - Files are now dispatched in the following sub-directories:
          lib, sxpm, and doc.
        - Imakefiles will let you build a shared library as well as the static
          one (with either X11R4 or X11R5).
        - The documentation has been ported from LaTeX to FrameMaker and is
          now included in the distribution in its PostScript form (doc/xpm.ps).
          Source files are available on request.
          Also the documentation has been reoreganized and includes a table of
          contents and an index of the functions (the number of functions
          increasing this became a requisite).

    BUGS CORRECTED:
        - Many warnings have been fixed - patch from Daniel Dardailler 
          daniel@osf.org

3.2e            (93/02/05)

    ENHANCEMENTS:
        - use XpmMalloc, XpmRealloc, XpmCalloc, and XpmFree which are defines
        in xpmP.h. This should help people wanting to use their own functions.

    BUGS CORRECTED:
        - Intrinsic.h is no longer included.
        - bzero is defined as memset on SYSV and SVR4.
        - some memory initialisation bug concerning XpmAttributes.

3.2d            (93/01/27)

    ENHANCEMENTS:
        - compile on Solaris 2.0
                - patch from Clint Jeffery <cjeffery@cs.arizona.edu>

    BUGS CORRECTED:
        - shape masks are now set correctly for LSBFirst (Decs).
        - pixmaps are now set correctly for 2 bit displays (Nexts).
                - patch from Josef Leherbauer <joe@takeFive.co.at>
        - isspace was called on getc which fails when EOF is returned.
                - Marelli Paolo <marelli@colos3.usr.dsi.unimi.it>

3.2c            (92/12/29)

    ENHANCEMENTS:
        - parsing optimized for single and double characters color
                - patch originally from Martin Brunecky 
                                       marbru@build1.auto-trol.com

    BUGS CORRECTED:
        - XpmFreeExtensions was calling free on some argument without checking
        it was not NULL.
        - strdup was not correctly defined for systems which do not provide
        it.     - Hans-Peter Lichtin <lich@zellweger.ch>
        - some bug in XpmCrDataFI.c
                - Sven Delmas garfield@avalanche.cs.tu-berlin.de

    NOTE:
        - there is still a bug with the creation of the clipmask on display of
        depth 2 but I can't find a fix because unfortunately I don't have such
        a rendering system and nobody gets the time to investigate for me.

3.2b            (92/10/19)

    ENHANCEMENTS:
        - Create XpmReadFileToData and XpmWriteFileFromData
                - Dan Greening <dgreen@sti.com>
        - added "close colors" support and ability to redefine color values
          as pixels at load time, as well as color names
                - Jason Patterson <jasonp@fitmail.qut.edu.au>
        - errors while parsing or allocating colors now revert to other
          visual defaults, creating pixmap/image as expected, and returning
          XpmSuccess. The old behaviour of XpmColorError being returned and no
          pixmap/image being created can be retained by setting the
          exactColors attribute.
                - Jason Patterson <jasonp@fitmail.qut.edu.au>

    BUGS CORRECTED:
        - SVR4 defines for including <string.h> instead of <strings.h>
                - Jason Patterson <jasonp@fitmail.qut.edu.au>
        - attributes->extensions and attributes->nextensions fields were not 
          set correctly when no extensions present in file.
                - Simon_Scott Cornish <cornish@ecr.mu.oz.au>

3.2a            (92/08/17)

    ENHANCEMENTS:
        - use the mock lisp hashing function instead of the gnu emacs one,
        it is faster in some cases and never slower (I've not found any case).

    BUGS CORRECTED:
        - function prototypes for ansi compilers.
        - some memory initialization bugs (purify is just great for this).
        - empty strings in extensions are now correctly handled.

3.2             (92/07/06)

    NEW FEATURES:
        - both format and functions handle extensions data. This allow people
        to store additional data related to a pixmap. See documentation for
        detail.
        - sxpm supports the new option '-c' to use a private colormap. This is
        useful when displaying pixmaps using a lot of colors.
        - sxpm supports the new option '-v' (verbose) to get possible
        extensions print out on standard error.

    ENHANCEMENTS:
        - most of the code has been reworked to be improved and thus almost
        every function is faster. It takes less than 6 seconds of real time on
        a sun4 to display, with sxpm, a 487x635 pixmap using 213 colors, while
        it takes 32 seconds with the old library! It takes 18 seconds to
        display a 1279x1023 screen dump using 14 colors while xwud takes 10
        seconds.
        Of course performance improvements are not always that great, they
        depend on the size and number of colors but I'm sure everybody will
        appreciate ;-)
        I know how to improve it more but this will require changes in the
        architecture so this is not for now. Some optimizations have been
        contributed by gregor@kafka.saic.com (gregg hanna) and
        jnc@csl.biosci.arizona.edu (John N. Calley).
        - the Imakefile is modified to let you install sxpm - Rainer Klute
           <klute@irb.informatik.uni-dortmund.de>
        - xpmP.h declares popen for Sequent platforms - Clinton Jeffery
           <cjeffery@cs.arizona.edu>
        - XpmWriteFileFromImage/Pixmap rather than truncating the pixmap name
        to the first dot changes dots to underscores to get a valid C syntax
        name.


    BUGS CORRECTED:
        - there was a bug in the image creation function for some 24 bits
        displays. It is fixed.
        - allocated color pixels are now freed when an error occurs -
           nusser@dec1.wu-wien.ac.at (Stefan Nusser)

    CHANGES TO THE DOC:
        - the documentation describes the new XpmExtension structure and how
        to use it with read and write functions.

3.1             (92/02/03)

    ENHANCEMENTS:
        - sxpm now have more standard options (mainly suggested by 
        Rainer Sinkwitz <sinkwitz@ifi.unizh.ch>):

        Usage:  sxpm [options...]
        Where options are:

        [-d host:display]            Display to connect to.
        [-g geom]                    Geometry of window.
        [-hints]                     Set ResizeInc for window.
        [-icon filename]             Set pixmap for iconWindow.
        [-s symbol_name color_name]  Overwrite color defaults.
        [-p symbol_name pixel_value] Overwrite color defaults.
        [-plaid]                     Read the included plaid pixmap.
        [filename]                   Read from file 'filename', and from
                                     standard input if 'filename' is '-'.
        [-o filename]                Write to file 'filename', and to standard
                                     output if 'filename' is '-'.
        [-nod]                       Don't display in window.
        [-rgb filename]              Search color names in the rgb text file
                                     'filename'.

        if no input is specified sxpm reads from stdandard input.


        - Xpm functions and Ppm converters now deal with multiword colornames.
          patches from Rainer Sinkwitz <sinkwitz@ifi.unizh.ch>.


3.0             (91/10/03)

        Functions name and defines have been modified again (sorry for that)
        as follows:

             XpmReadPixmapFile    XpmReadFileToPixmap
             XpmWritePixmapFile   XpmWriteFileFromPixmap

             XpmPixmapColorError  XpmColorError
             XpmPixmapSuccess     XpmSuccess
             XpmPixmapOpenFailed  XpmOpenFailed
             XpmPixmapFileInvalid XpmFileInvalid
             XpmPixmapNoMemory    XpmNoMemory
             XpmPixmapColorFailed XpmColorFailed

        To update code using Xpm you can use the included shell script called
        rename with the sed commands files name-3.0b-3.0c and name-3.0c-3.0.
        Old names still valid though.

    NEW FEATURES:
        - four new functions to work with images instead of pixmaps:

             XpmReadFileToImage
             XpmWriteFileFromImage
             XpmCreateImageFromData
             XpmCreateDataFromImage

    ENHANCEMENTS:
        Algorithms to create and scan images and pixmaps are based on the
        MIT's R5 code, thus they are much cleaner than old ones and should
        avoid any problem with any visual (yes, I trust MIT folks :-)

    BUGS CORRECTED:
        Imakefile use INCDIR instead of ROOTDIR.

    CHANGES TO THE DOC:
        - the documentation presents the four new functions.

3.0c            (91/09/18)

        In answer to request of people functions, types and defines names have
        been changed as follows:

             XCreatePixmapFromData       XpmCreatePixmapFromData
             XCreateDataFromPixmap       XpmCreateDataFromPixmap
             XReadPixmapFile             XpmReadPixmapFile
             XWritePixmapFile            XpmWritePixmapFile
             XFreeXpmAttributes          XpmFreeAttributes

             PixmapColorError            XpmPixmapColorError
             PixmapSuccess               XpmPixmapSuccess
             PixmapOpenFailed            XpmPixmapOpenFailed
             PixmapFileInvalid           XpmPixmapFileInvalid
             PixmapNoMemory              XpmPixmapNoMemory
             PixmapColorFailed           XpmPixmapColorFailed

             ColorSymbol                 XpmColorSymbol

        Generally speaking every public name begins with 'Xpm' and every
        private one with 'xpm'. This should avoid any possible conflict.

        Some files have also be renamed accordingly.

    NEW FEATURES:
        - support for VMS and two new options for sxpm: icon and hints (see
        manual for details) Richard Hess <rhess%pleione%cimshop@uunet.UU.NET>
        - DEFINES in Imakefile and Makefile.noXtree allows you to set the
        following:

                 ZPIPE for un/compressing piped feature (default is on)
                 NEED_STRCASECMP for system which doesn't provide one (default
                                 is off)

        - xpmtoppm.c has is own strstr function which is used if NEED_STRSTR
        is defined when compiling - Hugues.Leroy@irisa.fr (Hugues Leroy).
        
    BUGS CORRECTED:
        - many bugs have been fixed, especially for ansi compilers -
               Doyle C. Davidson (doyle@doyled.b23b.ingr.com) and
               Clifford D. Morrison (cdm%bigdaddy%edsr@uunet.UU.NET)
        - parser is again a little more improved

3.0b            (91/09/12)

        This is a complete new version with a new API and where files and
        structures have been renamed. So this should be taken as a new
        starting release.
        This release should be quickly followed by the 3.0 because I'm planning
        to send it for X11R5 contrib which ends October 5th.

    NEW FEATURES:
        - support for transparent color.
        - support for hotspot.
        - a new function: XCreateDataFromPixmap to create an XPM data from a
        pixmap in order to be able to create a new pixmap from this data using
        the XCreatePixmapFromData function later on.
        - a new structure: XpmAttributes which replace the XpmInfo structure
        and which leads to a much simpler API with less arguments.
        - arguments such as visual, colormap and depth are optionnal, default
        values are taken if omitted.
        - parsing and allocating color failures don't simply break anymore. If
        another default color can be found it is used and a PixmapColorError
        is returned. In case no color can be found then it breaks and returns
        PixmapColorFailed.
        - for this reason the ErrorStatus codes are redefined as follows:

                   null     if full success
                   positive if partial success
                   negative if failure

        with:
                #define PixmapColorError    1
                #define PixmapSuccess       0
                #define PixmapOpenFailed   -1
                #define PixmapFileInvalid  -2
                #define PixmapNoMemory     -3
                #define PixmapColorFailed  -4

        - sxpm prints out a warning when a requested color could not be parsed
        or alloc'ed, and an error when none has been found.
        - sxpm handles pixmap with transparent color. For this purpose the
        plaid_mask.xpm is added to the distribution.

    BUGS CORRECTED:
        - I've again improved the memory management.
        - the parser is also improved.
        - when writting a pixmap to a file the variable name could be
        "plaid.xpm" which is not valid in C. Now the extension name is cut off
        to give "plaid" as variable name.
        - reading multiple words colornames such as "peach puff" where leading
        to non readable Xpm files. They are now skipped to have only single
        word colorname. Lionel Mallet (mallet@ipvpel.unipv.it).
        - parser was triggered by the "/" character inside string.
        Doyle C. Davidson (doyle@doyled.b23b.ingr.com). This is corrected.
        - sxpm maps the window only if the option "-nod" is not selected. 

    CHANGES TO THE DOC:
        - the documentation presents the new API and features.

3.0a            (91/04/10)

        This is an alpha version because it supports the new version of XPM,
        but the library interface is still the same. Indeed it will change in
        future release to get rid of obsolete stuff such as the type argument
        of the XWritePixmapFile function.

    ******************************* WARNING *********************************
        The format is not anymore XPM2, it is XPM version 3 which is XPM2
        limited to the C syntax with the key word "XPM" in place of "XPM2 C".
        The interface library has not changed yet but the type argument of
        XWritePixmapFile and the type member of XpmInfo are not used anymore.
        Meanwhile the library which is now called libXpm.a is backward
        compatible as XPM2 files can be read. But the XWritePixmapFile
        function only writes out XPM version 3 files.
    *************************************************************************

    NEW FEATURES:
        - the library doesn't use global variables anymore, thus it should be
        able to share it.
        - sxpm has been rewritten on top of Xt, it can be used to convert
        files from XPM2 to XPM version 3.
        - xpm1to2c.perl has been upgraded to the new XPM version and renamed
        as xpm1to3.perl
        - ppmtoxpm2.c and ppmtoxpm2.1 have been upgraded too and renamed
        ppmtoxpm.c and ppmtoxpm.1. In addition the xpmtoppm.c and xpmtoppm.1
        of the pbmplus package have been upgraded too. xpmtoppm can thus
        convert XPM version 1 and 3 to a portable pixmap. These files should
        replace the original ones which are part of the pbmplus package. See
        the ppm.README file for more details.
        - the library contains RCS variables which allows you to get revision
        numbers with ident (which is part of the RCS package). The Id number
        is an internal rcs number for my eyes only. The official one is found
        in Version.

    BUGS CORRECTED:
        - the memory management has been much improved in order to avoid
        memory leaks.
        - the XImage building algorythm has been changed to support correctly
        different visual depths. There is special code to handle depths 1, 4,
        6, 8, 24, and 32 to build the image and send it in one whack, and
        other depths are supported by building the image with XPutPixel which
        is slow but sure.
        - similar algorithms are used to read pixmaps and write them out.

    CHANGES TO THE DOC:
        - the documentation presents the new XPM format.


2.8             (90/12/19)

    ******************************* WARNING *********************************
        Since the last release two structures have been modified and have now
        bigger sizes, so ANY CODE USING THE libXPM2 NEEDS TO BE RECOMPILED.
    *************************************************************************

    NEW FEATURES:
        - the ColorSymbol struct contains the new member 'pixel' which allow
        to override default colors by giving a pixel value (in such a case
        symbol value must be set to NULL),
        - the XpmInfo struct contains the new member 'rgb_fname' in which one
        can specify an rgb text file name while writing a pixmap with the 
        XWritePixmapFile function (otherwise this member should be set to
        NULL). This way colorname will be searched and written out if found
        instead of the RGB value,
        - Imakefile originally provided by stolcke@ICSI.Berkeley.EDU,
        - the old Makefile is now distributed as Makefile.noXtree and presents
        install targets,
        - the demo application is renamed sxpm (Show XPM), creates a window of
        the size of the pixmap if no geometry is specified, prints out
        messages instead of status when an error occurs, handles the new
        option -p for overriding colors by giving a pixel value (not really
        useful but is just here to show this new feature), handles the new
        option -rgb for specifying an rgb text file, and ends on
        keypress as buttonpress,
        - defines for SYSV have been provided by Paul Breslaw
        <paul@mecazh.uucp>,
        - the distribution includes a new directory called converters which
        contains xpm1to2 and xpm1to2c perl converters and a ppmtoxpm2
        converter provided by Paul Breslaw who upgraded the original ppmtoxpm
        written by Mark W. Snitily <mark@zok.uucp>.

    CHANGES TO THE DOC:
        - this file is created and will give old users a quick reference to
        changes made from one release to the next one,
        - documentation is changed to present the new ColorSymbol structure
        and the way to override colors by giving a pixel value, and to present
        the new XpmInfo structure and how to use it,
        - a man page for sxpm is added to the distrib,
        - the README file talks about sxpm and no more demo, and have
        reference to the different converters.

2.7             (90/11/12)

    NEW FEATURES:
        - XReadPixmapFile reads from stdin if filename is NULL,
        - XWritePixmapFile writes to stdin if filename is NULL,
        - the demo application handles the new option -nod for no displaying
        the pixmap in a window (useful when used as converter).

    CHANGES TO THE DOC:
        - documentation about the new feature.

2.6             (90/10/29)

    NEW FEATURES:
        - from nazgul@alphalpha.com (Kee Hinckley): changes to make the
        library usable as C++ code, and on Apollo without any warning.

    BUGS CORRECTED:
        - from nazgul@alphalpha.com (Kee Hinckley): the xpm include files was
        declaring XWritePixmapFile as taking in arg a Pixmap pointer instead
        of a Pixmap.

2.5             (90/10/17)

    BUGS CORRECTED:
        - XWritePixmapFile was not closing the file while ending normaly.

2.4             (90/09/06)

    NEW FEATURES:
        - XReadPixmapFile reads from a piped uncompress if the given filename
        ends by .Z or if filename.Z exists,
        - XWritePixmapFile writes to a piped compress if the given filename
        ends by .Z.

    BUGS CORRECTED:
        - demo now deals with window manager.

    CHANGES TO THE DOC:
        - documentation about compressed files management.

2.3             (90/08/30)

    BUGS CORRECTED:
        - handle monochrom display correctly,
        - comments can be empty.

2.2             (90/08/27)

    BUGS CORRECTED:
        - when reading some invalid free was dumping core on some machine.

2.1             (90/08/24)

    First distribution of XPM2.