From: Nick Bowler <nbowler@draconx.ca>
Date: Thu, 12 Jan 2023 05:51:41 +0000 (-0500)
Subject: Performance improvements for runtime icon generation.
X-Git-Url: http://git.draconx.ca/gitweb/rrace.git/commitdiff_plain/2345a9dba343693668ece5abbba1fe58e0e18ed8?hp=2345a9dba343693668ece5abbba1fe58e0e18ed8

Performance improvements for runtime icon generation.

As most of the rows for any given icon tile are the same as the
previously-generated row, it is not necessary to recompute the
colour values every single time.  The code can be adjusted to
re-use the previously-computed row instead.

Since the generic code now works on bytes, we can also replace the
open-coded loops in the row generation with a couple of memset calls,
which should help modern compilers produce more efficient output.

All this reduces the amount of computation done by the generic code
substantially, to roughly a quarter of what it was previously.

Also take the time to remove some unneeded complexity in the EWMH
formatting implementation, which further helps a little bit on the
code size front.
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