[PYTHON IMAGE-SIG] Using PIL with "stock" _tkinter.so

[Fred L. Drake, Jr.]

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  Some time ago, I asked about using Tk & PIL together with a "stock"
_tkinter.so.  Fredrik kindly invited me to have a go at it.  ;-)
  Well, I did, and it didn't take much time once I sat down to do it.
I've attached the two files needed to build the PIL/Tk support: a modified
copy of Tk/tkImaging.c (I added a module initialization function), and a
Tk/Setup.in file.
  In addition, the line:

	import _tkimaging

should be added to Lib/ImageTk.py; I added it immediately after the
existing import statement at the top of the file.
  To build this support, copy the file Misc/Makefile.pre.in from the
Python distribution into the Tk/ directory of the PIL distrinbution and
check the paths in Tk/Setup.in. Run the command:

	make -f Makefile.pre.in boot ; make

This will build a new module which does nothing more than register the PIL
integration code with the Tk PhotoImage support.  Copy _tkimagingmodule.so
and _imagingmodule.so to $exec_prefix/lib/python1.4/sharedmodules, and 
Lib/*.py from PIL to $prefix/lib/python1.4.  (Use the $prefix and
$exec_prefix from the Python build.)  Then you're all set!
  Here's what it's really doing:  The functions in Tk/tkImaging.c need to
have access to a couple of functions from the Tk library to do their work.
These are exported by whatever object is providing the library for
_tkinter.so.  Typically, the Tk library is statically linked into
_tkinter.so, but the symbols are exported.  The new module links to
_tkinter.so, which provides the needed entry points into the Tk library.
  If Tk is dynamically linked to _tkinter.so, _tkimagingmodule.so should
be linked to the dynamic Tk library rather than _tkinter.so; do this by
adjusting the Setup.in (or better yet, the generated Setup file) to
reflect this (see the TK variable).
  If Tk is statically linked to _tkinter.so but the Tk symbols are not
exported, you have to use the old method.  ;-(

  Enjoy!


  -Fred

--
Fred L. Drake, Jr.
fdrake@cnri.reston.va.us
Corporation for National Research Initiatives
1895 Preston White Drive
Reston, VA    20191-5434

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