566771 - Line artifacts at some zoom levels

Status: RESOLVED DUPLICATE of bug 566283

(Core :: Graphics, defect)

Description

[Drew Willcoxon :adw]

Attachment: Wikipedia screenshot, zoom +3

Some zoom levels on some pages cause stray lines to appear.  These lines are often black, but not always, and often they happen around images, but not always.  There's a similar bug 468496, but it's Linux- and image-only.

Attached are a few example screenshots.  In the Wikipedia shot there's a horizontal line across near the top the entire width of the page; a vertical black line at the right edge of the Wikipedia logo; black lines around the Discussion, Edit, and View history tabs at the top; and a black line under Toolbox in the left sidebar.

In the Google shot there are lines at the right and bottom sides of the logo.

The worst is Google Maps:  There are gray lines in a grid pattern within the map.

Comment 1

[Drew Willcoxon :adw]

Attachment: Google screenshot, zoom +1

Comment 2

[Drew Willcoxon :adw]

Attachment: Google Maps screenshot, zoom +1

Comment 3

[Drew Willcoxon :adw]

roc, any ideas?

Comment 4

[Robert O'Callahan (:roc) (email my personal email if necessary)]

This probably Mac cairo not doing EXTEND_PAD correctly. Jeff, did I hear something about that maybe being fixed in cairo?