Notes:
* Added initial version of JIT accelerated yuv420p -> yuyv422
scaler (Nokia 770 only). This scaler is a lot faster (up to
8x factor) than any of the standard scalers from libswscale
(the previous implementation). Right now image quality for
scaled video decreased somewhat, but that will be fixed in
one of the next versions. In order to revert to old scaler
implementation you can use '-vo nokia770:jitscale=0' command
line option. Also 'jitscale' suboption sets image quality
for JIT scaler. Right now there are two settings: 2 (default)
and 1 (a bit faster but looks even worse - that's nearest
neighbour / point scaler algorithm). This new fast scaler
eliminates an old weakness of maemo port of MPlayer - jerky
playback for 'inconvenient' video resolutions.
* Some optimizations for unscaled yuv420p -> yuyv422 color format
conversion (up to 1.5x improvement)
* Added 'vo_change_rectangle' slave command, it can be used to
change video output screen area any time, this command
works with -vo nokia770 video output driver
Changes:
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