Re: [Plplot-general] Where is the PNG driver ?

[Dan L. <dle...@ip...>]

      Greta plplot installation (with optional png and gif)
          and linking to greta "One way that works"-ldl 11-16-2000
-------------------------------------------------------------------------

(1) (PNG only) Need libpng.a(so) and libz.a(so). If don't have in /usr/lib,
      These usually come together and are closely synced in versions.  One place to get is:
       http://www.libpng.org/pub/png/libpng.html and get source libpng-1.0.8.tar.gz
       http://www.info-zip.org/pub/infozip/zlib/   and get source zlib-1.1.3.tar.gz
     If you have recent versions of zlib and libpng, you could skip to plplot install.
      Only problem is libpng needs to be patched for png to not core dump on a png file
      write.  zlib actually is probabably fine at /usr/lib/libz.so and need not
      be installed. 
(2) (PNG only) in home directory, gzip -cd libpng-1.0.8.tar.gz | tar -xvf -
                 and              gzip -cd zlib-1.1.3.tar.gz | tar -xvf -
(3) (PNG only) png only.  mv libpng-1.0.8 libpng, and zlib-1.1.3 to zlib
(4) (PNG ONLY)
  To avoid core dumps with png,  I also must change in libpng, file pngwio.c,
    function png_default_write_data, line 51:

   check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));

    change to:
     if (png_ptr->io_ptr)
         check = fwrite(data, 1, length, (png_FILE_p)(png_ptr->io_ptr));

     This change is done is conjucntion with 18 below.
(5) (PNG only) make these libraries.  They are easy, just do ./configure; make
      and you should now have a libpng.a, libpng.so, libz.so, and libz.a
(6) mv $HOME/libpng /usr/lib and mv $HOME/zlib /usr/lib in order to clean things up a bit.
(7) Because of problem with default libpng, need to put it in LD_LIBRARY_PATH path,
     otherwise it finds the one in /usr/lib/libpng.so

-------------------End of libpng and libz (if needed-----------------------
------------------Start of plplot------------------------------------------

I can't mess with changing the /usr area yet.  Also, modifications
to plplot need to be made to add the png and gif drivers.

(1) Obtain the latest version of plplot-990122.gz (os at least the one
    which has code for drivers.  I got it through ftp.msfc.nasa.gov
     via Michael <Mic...@ms...>.  I don't see 
     file plplotlib.tar.Z anymore.
(2) from home directory, gzip -cd plplotlib.tar.Z | tar -xvf - 
(3) cd plplot-990122, 
      ./configure
    (would be ./configure --prefix=/usr/lib/plplot if done for good install)
    ( as root, mkdir /usr/lib/plplot with  rw-rw-rw- on plplot -- again,
       would be for a true install, which I am not yet able to do )
(4) plplot has a typedef PLFLT which can be a DOULBE or FLOAT.  The 
    greta makefile has CFLAGS= -DDOUBLE ..., meaning it has defined
    PLFLT to be a DOUBLE.  Left alone, PLFLT will be a float. Thus, 
    let's be sure its a DOUBLE in all plplot libs:

       edit line 196  of tmp/plplot.h, adding  "#define DOUBLE 1".
    This will insure that the following macro 
           #if defined(PL_DOUBLE) || defined(DOUBLE)
           typedef double PLFLT;
           #else
           typedef float PLFLT;
           #endif
    will always evaluate to typedef double PLFLT;, so no greta/plplot lib
     conflicts arise.
(5) tmp/plDevs.h has many drivers that are not needed. Most can be commented out
     except 
        #define PLD_null 1 (might not need)
        #define PLD_xterm 1 (might not need)
        #define PLD_ps 1
        #define PLD_psc 1
        #define PLD_lj_hpgl 1
        #define PLD_xwin 1
        #define PLD_tk 1 (this is very much needed I believe)
        #define PLD_gif  (add for gif only)
        #define PLD_png  (add for png only)
     note png and gif need to be added.
(6) (GIF and PNG only) 
       cd tmp; cp ../Cver2/gd* .  This picks up gdgif.{c,h} and gdpng.{c,h}
     This with bring in gdgif.c and gdpng.c and headers and backups
(7) (GIF and PNG only) edit tmp/Makefile, add to the "DRIVERS_C" macro
           gdgif.c \
           gdpng.c
(8) (GIF and PNG only) edit tmp/Makefile, add to the "DRIVERS_OBJ" macro
           gdgif$O \
           gdpng$O
(9) (GIF and PNG only).  Make sure you have libgd.so in /usr/lib or /lib
(10) (GIF and PNG only) edit tmp/Makefile, copy the line 
xwin$O: xwin.c plDevs.h plplotP.h plConfig.h plplot.h plstrm.h pdf.h pldebug.h \
  plxwd.h drivers.h plevent.h
paste it twice below, then edit xwin twice in each line to be gdgif$0: gdgif.c ..
and gdpng$O: gdpng.c
(11) (GIF and PNG only) edit tmp/Makefile again, find the macro LDC_LIBS and edit until 
    it looks like:
   LDC_LIBS=-litk3.0 -ltk8.0 -litcl3.0 -litcl8.0 -L/usr/X11R6/lib -lX11 \
       -lgd -lpng -lz -ldl -lm
     It seems that -litk3.0 -litcl3.0 are not needed, not even installed on some systems --
         might try leaving off.
(12) png has a tendency to core dump, as do gifs.  Only solution I found to date in is in
     tmp/gdpng.c check for to see if File handle ?->Outfile is not null before closing it.
     This is done in conjunction with 13 above.  It is unfortunate that I have to change
      libpng.  Because of this, I also have to put it in LD_LIBRARY_PATH path, otherwise
      it finds the one in /usr/lib/libpng.so
(13) Now we are ready to make all plplot libs.  cd $HOME/plplot-990122; make
     should not get any warnings.
(14) Finally we would want to install, with a "make install".  This would populate
    /usr/lib/plplot/ with lib, include, examples, doc directories.  But I
    currently use /home/dleonard/plplot-990122/tmp as the include and lib directory.

--------------------------End of plplot compile/install--------------------------------
--------------------------Start of application compile/install-------------------------

Now in our application, linking and compile statements are not aimed at /usr/lib/plplot yet
but at /home/dleonard/plplot-990122/tmp:

(1)  greta COMPILE Flags:
     OSCFLAGS=-I/home/dleonard/plplot-990122/tmp -DINTEL -DLINUX
     CFLAGS= -DDOUBLE $(OSCFLAGS) -I$(AXAFPROG)/include -I../ututils
    with
     .c.o:
        cc $(CFLAGS) -c $<     
(2) greta LINKING:
     OSLFLAGS=-ldl -L/usr/X11R6/lib -lX11 -ltk -ltcl -lncurses \
      -L/home/dleonard/plplot-990122/tmp -lplplotftk -lMatrix -lgd -lpng -lz
     LFLAGS= $(OSLFLAGS) -L$(AXAFPROG)/lib/$(OSTYPE) -lut -lgzip -lm
   and type is
     cc -o decom98 decom98.o plargs.o libgreta.so $(LFLAGS)

   also have
      ld -o libgreta.so decom98.o decrelay.o (other deleted) -shared

(3) (GIF and PNG) zlib and gzip have two terrible namespace conflicts: they both use "inflate"
    and "deflate".  Best solution I came up with was to rename in gzip.h inflate to inflate_gzip
    and deflate to deflate_gzip.  Then also in src/libgzip-2.4/inflate.c rename function
    inflate to inflate_gzip, and finally src/libgzip-2.4/deflate.c rename function
    deflate to deflate_gzip.
(4) We must also change in greta src/AX/axtlm.c and axtlm.h functions inflate and deflate to inflate_gzip
     and deflate_gzip to insure that they link to the gzip library and not libz
(5) now we can make greta, cd src/AX; rm *.o; make; make install
(6) we are now actually through with plplot-990122, we can hide it with mv plplot-990122 plplot-990122.hide
     I notice that if I do this libMatrix.so is actually found at /usr/lib/libMatrix.so.  libplplotftk
      I believe is statically linked.
(7) (GIF and PNG )  decgui needs to be able to command the new drivers. add lines:
     
           $beDevice->insert( 3, "gif" );
           $beDevice->insert( 4, "png" );

and change $outfile = $vPSFile.$decname.".ps";
    to $outfile = $vPSFile.$decname.".$vDest";

After thoughts:

Worst thing here is the need to modify libpng and not be able to use just the default version in /usr/lib
Modifying plplot has to be done in this version, would be nice if could handle from here.