[geckoview]:- WebRender with picture caching, cached tiles do not scroll with content
Categories
(Core :: Graphics: WebRender, defect, P2)
Tracking
()
People
(Reporter: mark.paxman99, Unassigned)
References
(Blocks 1 open bug)
Details
User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:67.0) Gecko/20100101 Firefox/67.0
Steps to reproduce:
In an Android GeckoView browser (I used reference-browser.apk)
Turn on WebRender
Ensure picture caching is on
Set gfx.webrender.debug.picture-caching TRUE
scroll a page e.g. mozilla.org
On Android the tiles stay stationary and the content moves up through the tiles. The tiles all remain red, presumably no caching is in effect.
On Desktop, the tiles move up the page with the scrolling and so most of the tiles remain green / cached. Only the bottom row go red.
I think the Desktop case is correct, the tiles should move to avoid unnecessary GPU work.
Comment 1•6 years ago
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I suspect this is the WR logic to detect the main scroll root failing on mobile.
I haven't tested picture caching on mobile yet, but I wouldn't be surprised if the display list layout coming from Gecko is different enough in structure that this logic is failing.
Comment 2•6 years ago
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This is the logic that I suspect is getting the wrong scroll root - https://searchfox.org/mozilla-central/source/gfx/wr/webrender/src/display_list_flattener.rs#279
Comment 3•6 years ago
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This is an awesome bug report - thank you Mark!
Please keep testing WR on Android and let us know of other issues you find.
Comment 4•6 years ago
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(In reply to Glenn Watson [:gw] from comment #2)
This is the logic that I suspect is getting the wrong scroll root - https://searchfox.org/mozilla-central/source/gfx/wr/webrender/src/display_list_flattener.rs#279
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Comment 5•6 years ago
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This will be taken care of by bug 1536357.
Description
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