hrydgard/ppsspp — pull request #1687 by PeterTh (2013-05-05 18:27:01+00:00)
Title: Bicubic scaling fixes & speedup

- Fixed an error in the Mitchell-Netravali formula. Results are quite a bit better now
- Fixed an off-by-one rounding issue that caused minor artifacts in the plain C implementation of bicubic scaling
- Added a SSE4.1 implementation of bicubic scaling. It's 60-70% faster in my tests.