[Webkit-unassigned] [Bug 156130] New: non-integer transform scale values result in 1px white lines being rendered

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=156130

            Bug ID: 156130
           Summary: non-integer transform scale values result in 1px white
                    lines being rendered
    Classification: Unclassified
           Product: WebKit
           Version: Safari 9
          Hardware: Macintosh
                OS: OS X 10.9
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Layout and Rendering
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: zsolt.ero at gmail.com
                CC: simon.fraser at apple.com

Created attachment 275463
  --> https://bugs.webkit.org/attachment.cgi?id=275463&action=review
html reproducing the case

URLs (if applicable) : http://playground-leaflet.rhcloud.com/say/1/edit?html,output
Other browsers tested: Firefox, Safari, IE
  Add OK or FAIL, along with the version, after other browsers where you
have tested this issue:
     Safari: FAIL
    Firefox: OK
         IE: OK

What steps will reproduce the problem?
(1) Open the above URL: http://playground-leaflet.rhcloud.com/say/1/edit?html,output or the attached file.
(2) Look at the rendered black div 


What is the expected result?
The rendered black div should be solid, with no 1px white lines visible.


What happens instead?
There are 1px white lines between the 256x256 image tiles. Firefox / IE renders it correctly, with no white lines.


Please provide any additional information below. Attach a screenshot if
possible.
This is a critical issue for the Leaflet interactive map library, used by millions of users, which we cannot fix without upstream help. 
On non-integer zoom levels (thus non-integer transform scale values) in Webkit browsers, there are 1px white lines appearing on the map. Firefox and IE render the same map perfectly.
This is a minimal, CSS-only reproduction case of the issue.

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.webkit.org/pipermail/webkit-unassigned/attachments/20160402/485c8aa5/attachment.html>