Platform/GFX/WebRender2020 Q1

WebRender Q1 2020

The purpose of this document is to highlight our priorities for WebRender in Q1 of 20202

Where have we shipped WebRender?

For a list of the various places we have shipped WebRender, see: https://wiki.mozilla.org/Platform/GFX/WebRender_Where

Under 'compositor usage' you can see the % of Windows users who are using WebRender: https://firefoxgraphics.github.io/telemetry/#view=windows-features

Core Priorities

Shipping WebRender

We want to keep shipping WebRender to as many targets as possible each quarter. Below is a list of releases in Q1 and what we are aiming to ship per release:

• 72 (Jan 7)
  • WR on Android for Pixels 2, 3, 2XL and 3XL
    • https://bugzilla.mozilla.org/show_bug.cgi?id=1600133
  • WR for Nvidia laptops with small screen
    • https://bugzilla.mozilla.org/show_bug.cgi?id=1566875
• 73 (Feb 11)
  • WR on Adreno 5xx and 6xx families
    • https://bugzilla.mozilla.org/show_bug.cgi?id=1602597
• 74 (March 10)
  • WR on a specific slice of Intel Laptops (TBD based on compositor work)

As part of this effort, we will need to monitor and fix any critical correctness or perf bugs that appear that could potentially block shipping those targets. Here is a list of metabugs where we will track any key bugs we will be monitoring for this effort:

• WR-71: https://mzl.la/2MiOEHZ
• WR-72: https://mzl.la/2pUB7wl
• WR-73: https://mzl.la/2JvXrmT

Software WebRender

We want to make progress on our plans for a software fallback for WebRender. We are currently in the midst of testing our various options. Our goals are as follows:

• Perform the testing and investigation necessary to make a decision on path forward by All Hands (end of Jan)
• After that, we will detail out our first milestone for SW WR

Bug for initial SW-WR perf investigations: https://bugzilla.mozilla.org/show_bug.cgi?id=1548395 Metabug for tracking SW-WR: https://bugzilla.mozilla.org/show_bug.cgi?id=sw-wr