Benjamin Otte c6eb7fd483 gsk: Fix luminance in Cairo and GL renderer ...

In particular, fix the combination of luminance and alpha. We want to do
  mask = luminance * alpha
and for inverted
  mask = (1.0 - luminance) * alpha
so add a test that makes sure we do that and then fix the code and
existing tests to conform to it.

2023-07-03 22:02:44 +02:00

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