Adding compressed Palm pixmap format to PIL; am I on the right track?

[Bill Janssen]

I'd like to add PIL support for the Palm pixmap format (sometimes
called Tbmp).

Looking over the PIL docs, I get the impression that support for
uncompressed formats can be added at the Python level, and support for
compressed formats, like the Palm format, needs to be added at the C
level (new files in libImaging, say PalmDecode.c and PalmEncode.c).

Is this the right path?

Bill