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["Stephen M. Webb" <stephen.webb@xxxxxxxxxxxxx>]

** Changed in: compiz
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1257223

Title:
  Negative plugin causes incorrect alpha blending ( a(1+x)+bx instead of
  a(1-x)+bx )

Status in Compiz:
  Fix Released
Status in “compiz” package in Ubuntu:
  Fix Released

Bug description:
  When the opacity of a negative window (that is, one for which negative
  plugin is activated) is reduced, it causes the compositor to blend it
  incorrectly: instead of the usual blending function of a(1-x)+bx (here
  x is alpha),  a(1+x)+bx is used. This causes the window area to become
  almost completely white in certain cases.

  Compiz version: rev. 3806.

  I think I could fix this bug myself, but I'm not familiar with the
  compiz codebase enough. Maybe someone could hint me where the actual
  compositing is implemented? This would save a lot of time for me.

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