square/thumbor — pull request #1 by swankjesse (2012-07-20 00:55:29+00:00)
Title: Frame first steps.

This composites one possibly-transparent image over another
possibly-transparent image. All interesting image manipulation
happens in C. This is unlike the existing watermark.py filter,
where the image is constructed in two phases (alpha and paste).

I haven't yet implemented 9-patch stretching; I'm saving that
for a follow up.