1857911 - optimize nsHTMLScrollFrame::WantAsyncScroll to avoid getting the scrolled rect

Status: RESOLVED FIXED

(Core :: Layout: Scrolling and Overflow, enhancement)

Comment 1

[Timothy Nikkel (:tnikkel)]

Attachment: Bug 1857911. Optimize nsHTMLScrollFrame::WantAsyncScroll to avoid getting the scrolled rect. r?#layout-reviewers

Everything in this function is relatively fast except for GetVisualScrollRange/GetLayoutScrollRange, so avoid calling them unless necessary.

This function can only return true if one of the scroll directions is not overflow hidden OR visual scroll range differs from the layout scroll range.

The visual scroll range can only differs from the layout scroll range on a root scroll frame, and only then if the visual viewport size is set and is different from the scroll port size (this is just the definition of those functions).

Depends on D190415

Comment 2

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/770e71dac763
Optimize nsHTMLScrollFrame::WantAsyncScroll to avoid getting the scrolled rect. r=layout-reviewers,emilio

Comment 3

[Cristina Horotan [:chorotan]]

https://hg.mozilla.org/mozilla-central/rev/770e71dac763