From: Nick Bowler <nbowler@draconx.ca>
Date: Wed, 9 Mar 2022 05:43:36 +0000 (-0500)
Subject: Reduce the amount of redundant drawing in the game area.
X-Git-Url: https://git.draconx.ca/gitweb/rrace.git/commitdiff_plain/b39d19918b63b80d1f3b068d158fe43415b9d1b6?hp=b39d19918b63b80d1f3b068d158fe43415b9d1b6

Reduce the amount of redundant drawing in the game area.

We only need to redraw tiles that have changed after a move, or
(in the case of expose events) that intersect the exposed region.
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