Closed Bug 987472 Opened 6 years ago Closed 5 years ago

Setting TranslateX while Homescreen Pans Can be Optimized


(Firefox OS Graveyard :: Gaia::Homescreen, defect, P2)



(Not tracked)

2.1 S2 (15aug)


(Reporter: mchang, Assigned: mchang)


(Depends on 2 open bugs)


(Keywords: perf, Whiteboard: [c=uniformity p=3 s=2014.08.15 u=][systemsfe])

Currently, the homescreen app sets the translateX on every frame with "translateX" + pixelTranslate + "px", which creates a new string concatenation, string allocation, string flatten, and a GC cleanup later. While it's not an overbearing burden, this can be optimized. We need some support from layout to set simple CSS transforms w/o doing the stringify, concat, and parsing on the CSS side, which should buy us some performance gains.
Hardware: x86 → ARM
Target Milestone: --- → 1.4 S6 (25apr)
I think we need to figure out what the goal is here. I don't think creating new object primitives is going to fly, but I do think there might be some ways to have a fast path for CSS transforms and hardware accelerated properties.

My suggestion is to file a platform bug to add support for fast paths for hardware accelerated properties, then block on that bug. Things like scale(), translateX(), translateY(), and translateZ(), etc.
I filed bug 987477 as a general bug for investigating a solution for CSS transforms. There may already be something filed somewhere though.
Depends on: 987477
We need either bug 987477 or bug 987479 to solve this. This is also needed for the new homescreen effort.
Target Milestone: 1.4 S6 (25apr) → 2.0 S1 (9may)
Whiteboard: [c=uniformity p=3 s= u=] → [c=uniformity p=3 s= u=][systemsfe]
Target Milestone: 2.0 S1 (9may) → 2.0 S2 (23may)
Target Milestone: 2.0 S2 (23may) → 2.0 S3 (6june)
No longer blocks: vertical-homescreen
Target Milestone: 2.0 S3 (6june) → 2.0 S4 (20june)
Target Milestone: 2.0 S4 (20june) → 2.0 S5 (4july)
QA Whiteboard: [VH-FL-blocking-][VH-FC-blocking-]
Just spoke with Kevin, this isn't a blocker on the vertical homescreen at the moment. Since we now scroll with APZ, we only set transforms while in homescreen edit mode. It's a very nice to have feature though.
Target Milestone: 2.0 S5 (4july) → 2.0 S6 (18july)
Target Milestone: 2.0 S6 (18july) → 2.1 S1 (1aug)
Target Milestone: 2.1 S1 (1aug) → 2.1 S2 (15aug)
Since we have the vertical homescreen, we don't need this while panning the homescreen.
Closed: 5 years ago
Resolution: --- → WONTFIX
Whiteboard: [c=uniformity p=3 s= u=][systemsfe] → [c=uniformity p=3 s=2014.08.15 u=][systemsfe]
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