Closed Bug 1261062 Opened 6 years ago Closed 6 years ago

When clamping the displayport margins to the max texture size, the margin is distributed unevenly


(Core :: Layout, defect)

48 Branch
Not set



Tracking Status
firefox45 --- wontfix
firefox46 --- wontfix
firefox47 --- fixed
firefox48 --- fixed


(Reporter: kats, Assigned: kats)



(Keywords: regression)


(1 file, 1 obsolete file)

The code added in bug 1135907 prevented the displayport from expanding beyond the maximum texture size. However when doing so it calculated a "budget" and then spent as much of the budget as possible on the top/left margin, using the rest for the bottom/right margin. If this code is hit, it can result in the displayport being "skewed" towards the top/left of the visible area, and so checkerboarding occurs more easily when scrolling down/right. This happened in bug 1258051 for example.
Attached patch Patch (obsolete) — Splinter Review
Attachment #8736700 - Flags: review?(dvander)
Attachment #8736700 - Flags: review?(dvander) → review+
Update r= so patch is ready for landing, to go into landing queue.
Attachment #8736700 - Attachment is obsolete: true
Attachment #8736889 - Flags: review+
Closed: 6 years ago
Resolution: --- → FIXED
Target Milestone: --- → mozilla48
Comment on attachment 8736889 [details] [diff] [review]
Patch for landing

Approval Request Comment
[Feature/regressing bug #]: APZ
[User impact if declined]: bug 1258051 is one example - if the user's system has smaller max texture sizes they can run into checkerboarding more frequently. Not many users will run into this problem.
[Describe test coverage new/current, TreeHerder]: tested by reporter of bug 1258051, no automated coverage for this particular bug
[Risks and why]: low risk, the codepath in question is not hit very often. low-impact fix and low risk.
[String/UUID change made/needed]: none
Attachment #8736889 - Flags: approval-mozilla-aurora?
Comment on attachment 8736889 [details] [diff] [review]
Patch for landing

Fix was verified in bug 1258051, Aurora47+
Attachment #8736889 - Flags: approval-mozilla-aurora? → approval-mozilla-aurora+
Depends on: 1413618
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