> I suspect KDE is not interpreting correctly the blend mode Yeah, KWin made the assumption that pre-multiplied is always supported, since the documentation said so in the past. Thanks for notifying me, I'll have that fixed in the next bugfix update.
> I think we can keep it working as before by adding PREMULTI. In the end there > is no overlay plane for DCE, and PIXEL_NONE and PREMULTI are equivalent when > one primary is composed on top of a black background. Makes sense to me. - Xaver
