Mostly seem to have fixed SDL_CalculateShapeTree. Mostly. There still seem to be some rendering artifacts, stepping effects, and such on Windows -- which indicates subtle logic errors in SDL_CalculateShapeTree(). Oh well, back into the salt mine.

#!/bin/sh
#
# Print the current source revision, if available

# FIXME: this prints the tip, which isn't useful if you're on a different
#  branch, or just not sync'd to the tip.
hg tip --template 'hg-{rev}:{node|short}' || echo "hg-0:baadf00d"