751508 - Blackened parts on places where content should be partly transparent

Status: RESOLVED DUPLICATE of bug 750535

(Core :: Graphics, defect)

Description

[Martijn Wargers (dead)]

Attachment: testcase

See testcase, in current trunk builds parts of that page can have more black parts or completely black parts where you should see transparency.

I see this on the HTC Desire HD, Samsung Galaxy SII and Samsung Galaxy Nexus.

I'll attach a screenshot of the bug.

This seems to be a regression.
I don't see it in an Aurora build of 2012-04-02, but I do see it in today's Aurora build. Also seeing it today's trunk build.

Comment 1

[Martijn Wargers (dead)]

Attachment: Screenshot of bug (from Galaxy Nexus)

Comment 2

[Martijn Wargers (dead)]

Initially, the page might look good, but a small scroll is enough to show the bug.

Comment 3

[Mark Finkle (:mfinkle) (use needinfo?)]

Chris - does this seem related to some of your changes?

Comment 4

[Naoki Hirata :nhirata (please use needinfo instead of cc)]

The transparancy doesn't scroll down with the current nightly 5/7/2012 on initial land.  I don't see the blackend parts.  Once the screensaver clicked in and repainted everything, the page works fine.  This was on the HD Desire HD


The aurora build shows the blacked parts 05-02-2012:
2012-04-02 - works
2012-04 15 - works
2012-04-22 - works
2012-04-26 - works (but you have to go out of the app and back in to see it working correctly when panning)
2012-04-27 - bug actual result occurs
2012-04-28 - bug actual result occurs
2012-04-30 - bug actual result occurs
2012-05-03 - bug actual result occurs

Bug occurs between  4/26 and 4/27

Comment 5

[Chris Lord [:cwiiis]]

I imagine this was a retained tile bug, which would've been fixed with bug 750535, though is still possible to manifest (just a lot more difficult, and the glitch would be transient). I would suggest that the bug in its current form should not block beta - I can cook up a complete fix so that retained tiles don't render incorrectly when opacity is involved if it's a priority.

Comment 6

[Martijn Wargers (dead)]

I'm not seeing this bug anymore, so you can mark this bug fixed too, if you prefer (and file a follow-up for whatever you describe in comment 5).

Comment 7

[Chris Lord [:cwiiis]]

Marking as fixed, as per comment #6.

Comment 8

[Johnathan Nightingale [:johnath]]

Resolving as a dup based on comment 5-7