by using a Pbuffer instead of a GLXPixmap, which is too often not
supported for direct rendering. The only way I found to make this
work was to do a (very) slow pixel-by-pixel copy from the Pbuffer
into the pixmap. However, this only needs to be done once for each
toolbar icon, and the icons are small, so it is not really a problem.
and incorrect call to cairo_set_source_rgba which is in an unused
function and has no effect except with versions of Tcl less than 8.6
where "load -lazy" is not available and unknown functions cause
immediate exit. Cleaned up remaining references to OpenGL in the
Cairo code, and updated the copyright and acknowledged Chuan Chen, who
coded the Cairo interface. No attempt yet to deal with memory leaks
caused by calling Cairo "create" functions without the accompanying
"destroy" functions.
Tim Edwards
Chuan Chen