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Sync changes from mozilla-central gfx/wr #3838

Merged
merged 2 commits into from Jan 21, 2020
Merged

Sync changes from mozilla-central gfx/wr #3838

merged 2 commits into from Jan 21, 2020
+77 −54

Commits on Jan 21, 2020

  1. Bug 1607836 - use SmallVec for render task dependencies. r=gw 

    The majority of render tasks have 0, 1 or 2 dependencies, except for pictures that typically have dozens to hundreds of dependencies. SmallVec with 2 inline elements avoids many tiny heap allocations in pages with a lot of text shadows and other types of render tasks.

Differential Revision: https://phabricator.services.mozilla.com/D60151

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/db0378df4c6616330779c46cd830dd2f76f53b1b
    @nical @moz-gfx
    nical authored and moz-gfx committed Jan 21, 2020
    7f65754

  2. Bug 1607836 - Preallocate picture task dependency vectors. r=gw 

    Unlike other types of render tasks, pictures can have hundreds of dependencies. The dependency vector is re-built every frame, leading to a lot of vector re-allocations in some pages.

Depends on D60151

Differential Revision: https://phabricator.services.mozilla.com/D60182

[ghsync] From https://hg.mozilla.org/mozilla-central/rev/dfe4fa983d2b1eaaa3db2141a5e1c0f5ae58d5d7
    @nical @moz-gfx
    nical authored and moz-gfx committed Jan 21, 2020
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