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miga-heygenandMiguel Ángel
9117b36471
The static-frame dedup reuses the previous frame's buffer when a frame is byte-identical to its predecessor. With motion blur on that test is not enough: the shutter window reads content either side of the frame instant, so a still frame next to a moving one reused a buffer that carries none of that motion. At 30 fps and 16 samples frame 11's window runs 10.75 to 11.25 at a 180 degree shutter and 10.06 to 11.94 at 720, so both reach past the frame instant and the default is affected too. motionBlurWindowIsStatic now owns whether a blurred frame may reuse its predecessor's buffer. It requires every frame the window reads from to be static, and covers the previous frame's window as well, because reuse claims the two blurred outputs are equal. The range is derived from the plan's own sample tick offsets, so it cannot drift from where the samples land. The guard's contract comes from #4013 by Dante-dan, which carried it before we did. One existing test fixture is widened: it asserted reuse with only the frame itself marked static, which the guard now correctly rejects. Co-authored-by: Miguel Ángel <miguel.sierra@heygen.com>