852377 - Glitchy rendering with multiple canvas elements

Status: UNCONFIRMED

(Core :: Graphics: Canvas2D, defect)

Description

[Evan Wallace [:evanw]]

Attachment: Test page to reproduce bug

I'm working on a tiled rendering app similar to Google Maps. The tiles are rendered using multiple absolutely-positioned canvas elements. Every now and then when updating multiple canvas elements, some of them fail to update and/or leave holes. This happens both in Firefox 19 and Firefox Nightly but not in WebKit browsers or in IE.

I've made a test case that pretty reliably reproduces the issue on OS X (10.8.3). To trigger the bug, open the attached page and move the mouse around. The issue should appear within a few seconds. The test page makes a lot of canvas elements because that increases the chance of the bug occurring, but this is not the cause of the bug. The issue occurred in my app with far fewer canvas elements, it just wasn't as reliable to reproduce.

Comment 1

[Evan Wallace [:evanw]]

Attachment: Screenshot of bug in Nightly

Comment 2

[Matthias Versen [:Matti]]

Seems to work for me on windows7 with Firefox19 and Firefox trunk