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Sergey Sharybin 885354daec Optimization for render result save

Skip byte->float conversion if output file format
supports high bit depths but configured to only
output 8 bits per channel.

Gives around 30% speedup when re-exporting movie file
to PNG image sequence here on laptop.

Possible further optimization:

- Skip color space conversion in imbuf_for_write
  function if we've got already have buffer in
  that space.

  This doesn't seem to happen often after tweak
  to render result to imbuf.

- Skip black alpha-under if original image is
  opaque,

  This is a bit tricky to detect.

2013-11-22 16:52:12 +06:00