Follow-up Comment #11, patch #2715 (project freeciv):
OK, in the hindsight, it was painfully obvious (and - in a way - already
hinted at in comment 5).
It's actually just 4 lines.
When creating tmpsurf, between cairo_create and cairo_set_source_surface, put
following:
cairo_save(cr);
cairo_set_operator(cr, CAIRO_OPERATOR_CLEAR);
cairo_paint(cr);
cairo_restore(cr);
That's all.
Now, talking about funny things:
for the moment, my patch leaks like crazy, but looking at 'ps -ly' right
after loading a rather large saved game ("xsize",100,100;"ysize",200,200):
original 2.3.0:
S 1001 2426 1626 17 80 0 165264 85986 poll_s pts/7 00:00:11
freeciv-gtk2
with my patch:
S 1001 2394 1626 4 80 0 105600 71072 poll_s pts/7 00:00:09
freeciv-gtk2
If I could plug the leak(s) and still retain such ratio, it would be a
significant improvement.
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