Bug 238317

Summary: [WinCairo] WCTileGrid should create tiles only for the inside of layer area
Product: WebKit Reporter: Fujii Hironori <Hironori.Fujii>
Component: New BugsAssignee: Fujii Hironori <Hironori.Fujii>
Status: RESOLVED FIXED    
Severity: Normal CC: don.olmstead, webkit-bug-importer
Priority: P2 Keywords: InRadar
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
Patch
none
Patch for landing none

Description Fujii Hironori 2022-03-24 00:28:32 PDT 
[WinCairo] WCTileGrid should create tiles only for the inside of layer area

1. Start WinCairo MiniBrowser
2. Go to https://www.gamecity.ne.jp/shingeki2/finalbattle/character.html
3. Scroll back and forth in the page

Actual: very slow
Expected: scrolling smoothly
Comment 1 Fujii Hironori 2022-03-24 00:34:41 PDT 
Created attachment 455620 [details]
Patch
Comment 2 Don Olmstead 2022-03-24 10:20:30 PDT 
Comment on attachment 455620 [details]
Patch

View in context: https://bugs.webkit.org/attachment.cgi?id=455620&action=review

> Source/WebKit/WebProcess/WebPage/wc/WCTileGrid.cpp:62
> +    WebCore::IntRect rect = pixelRect;

auto rect = WebCore::intersection(pixelRect, { { }, m_size });
Comment 3 Fujii Hironori 2022-03-24 12:50:10 PDT 
Created attachment 455668 [details]
Patch for landing
Comment 4 Fujii Hironori 2022-03-24 12:54:06 PDT 
Committed r291812 (?): <https://commits.webkit.org/r291812>
Comment 5 Radar WebKit Bug Importer 2022-03-24 12:55:15 PDT 
<rdar://problem/90785553>