Bug 206489

Summary:

[LFC][Multithreading] Introduce ConcurrentInlineLayoutContext

Product:

WebKit

Reporter:

zalan <zalan>

Component:

Layout and Rendering

Assignee:

zalan <zalan>

Status:

NEW ---

Severity:

Normal

CC:

bfulgham, emilio, koivisto, sam, simon.fraser, zalan

Priority:

Version:

WebKit Nightly Build

Hardware:

Unspecified

OS:

Unspecified

Bug Depends on:

Bug Blocks:

215087

Attachments:

Description	Flags
Patch	none
Concurrent line ranges	none

Description zalan 2020-01-19 21:36:52 PST

see bug 206158 and bug 205601

Comment 1 zalan 2020-01-19 21:53:34 PST

Created attachment 388200 [details]
Patch

Comment 2 zalan 2020-01-20 07:32:28 PST

Created attachment 388241 [details]
Concurrent line ranges

Comment 3 zalan 2020-01-20 07:53:22 PST

The idea here is that if we identify all the line breaks by pre-scanning the content (provided uniform line height etc), we could split the content into well defined line ranges and run concurrent line layout on them.

Comment 4 zalan 2020-01-20 08:04:30 PST

This is very different from bug 206158, where the layout is split at formatting context boundaries. The line line ranges here belong to the same inline formatting context so we always stay within an IFC. These are complementary concepts where we could layout multiple sibling IFCs in background threads in addition to splitting them into line ranges (using even more threads!:)

Comment 5 Sam Weinig 2020-01-20 11:59:12 PST

(In reply to zalan from comment #4)
> This is very different from bug 206158, where the layout is split at
> formatting context boundaries. The line line ranges here belong to the same
> inline formatting context so we always stay within an IFC. These are
> complementary concepts where we could layout multiple sibling IFCs in
> background threads in addition to splitting them into line ranges (using
> even more threads!:)

!