SSIM_downsample: If already Float, why reconvert?

[xurich-xulaco]

Attempts to fix a skipable mvf.Depth call on SSIM_downsample function

[WolframRhodium]

The function will enter the skip path in this case, and no VS function call will be made.

This can be verified through

import io
import logging

import vapoursynth as vs
import muvs
from muvs import core

import mvsfunc as mvf
muvs.pollute(mvf)

with io.StringIO() as f:
    with muvs.record(f):
        src = core.std.BlankClip(format=vs.GRAYS)
        flt = mvf.Depth(src, depth=32)
    logging.info(f.getvalue())

which prints

# output: 640 x 480, GrayS, 240 frames, 24/1 fps
clip0 = core.std.BlankClip(format=vs.PresetFormat.GRAYS)