Bug 83896

Summary:	xlib.fallback occasionally incorrectly treats OVER as SOURCE
Product:	cairo	Reporter:	Massimo <sixtysix>
Component:	xlib backend	Assignee:	Chris Wilson <chris>
Status:	RESOLVED MOVED	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	normal
Priority:	medium
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:
Attachments:	quick hack

Description Massimo 2014-09-15 15:39:56 UTC

Created attachment 106329 [details]
quick hack

the xlib.fallback composer calls a fill_reduces_to_source in
src/cairo.image-compositor.c that simplifies an OVER operator fill
to a SOURCE operator fill whenever the destination is clear.

This means that you have to mark the shm-image-surface as no longer clear
after it is filled as the attached quick hack does.
         
It fixes    
            
finer-grained-fallbacks      
over-above-source
over-around-source
over-between-source

all .xlib.fallback.rgb24

Comment 1 GitLab Migration User 2018-08-25 14:02:43 UTC

-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.

You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/cairo/cairo/issues/328.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.