Bug 363933

Summary:	x11-libs/xcompmgr wrong blending
Product:	Gentoo Linux	Reporter:	Cedric Sodhi <manday>
Component:	Current packages	Assignee:	Gentoo Linux bug wranglers <bug-wranglers>
Status:	RESOLVED NEEDINFO
Severity:	normal
Priority:	Normal
Version:	unspecified
Hardware:	All
OS:	Linux
Whiteboard:
Package list:		Runtime testing required:	---

Description Cedric Sodhi 2011-04-17 15:44:41 UTC

I'm not sure whether this is the correct place to put this (not to mention I might file this upstream, whereever that is):

I use NVidia and xcompmgr for composite. The NVidia docs state that composite managers should require "premultiplied alpha" (a,a*r,a*g,a*b) . It looks like xcompmgr does not expect premultiplied alpha which causes problems if applications expect it to expect it.

Example: I set 50% #3F3733 on urxvt but it renders like 50% 2*#3F3733. Hence only 50% 1F1B19 gives the correct results.

Reproducible: Always

Comment 1 Jeroen Roovers (RETIRED) gentoo-dev

2011-04-18 14:58:02 UTC

1) Please post your `emerge --info' too.
2) What makes you suggest that it's xcompmgr that is doing this, and not rxvt-unicode, the Nvidia driver or something else entirely?

Comment 2 Jeroen Roovers (RETIRED) gentoo-dev

2011-04-22 02:42:53 UTC

3) And then reopen this bug report, if at all needed.