Whew, time to look at every `int` variable we ever declared! The best
moment to do this would have been a year ago, but well, better late
than never. No need to communicate that in comments anymore.
These shouldn't be used for widths, heights, or sprite-space
coordinates. Maybe we'll cover that another time, this commit is
already large enough.
Part of P0111, funded by [Anonymous] and Blue Bolt.
And that's all? No unblitting or non-aligned functions? Oh well, at
least this one correctly clips the sprite at all 4 edges of VRAM, for
once.
Part of P0105, funded by Yanga.
nmlgc