[Bug 1930982]

Lsalzman 1930982 at bugs.launchpad.net
Mon Jun 14 20:13:56 UTC 2021

The circumstantial evidence "seems like" something in the function here
central/source/gfx/wr/swgl/src/composite.h#534) is underflowing. But I
would need someone who can reliably reproduce the issue to find out
where in those math equations are actually doing so. I tried testing in
my patch if the additions were the culprit, but that seems unlikely.

It's possible the multiplications "rbCoeffs * uv" or "gCoeffs * uv" are
underflowing based on whatever values the ARM video codecs seem to be
supplying. However, this is not happening on x86 at all, which is
strange, and it is also happening on ARM across platform, which is
further strange, since there isn't really much in the way of platform
specific code here.

Sotaro, might you be able to investigate this?

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