885354daec
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.