Added optimizations for several:
- SRC fast paths:
- src_n_8_8888
- src_n_8_8
- OVER fast paths:
- over_n_0565
- over_n_8888
- OVER nearest neigbor scaling fast paths:
- over_8888_8_0565
- over_0565_8_0565
Benchmark results (lowlevel-blt-bench) on Malta board (@1Ghz) are
included in the log messages.
Any comments to these patches are welcome.