Bug 305441

Summary: [GTK][WPE][Coordinated Graphics][Damage Tracking] async scroll causes flickering tiles
Product: WebKit Reporter: Fujii Hironori <fujii.hironori>
Component: WebKitGTKAssignee: Pawel Lampe <plampe>
Status: RESOLVED FIXED    
Severity: Normal CC: bugs-noreply, plampe
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
scrollblock.html
none
screen capture none

Fujii Hironori
Reported 2026-01-13 18:39:10 PST
Created attachment 477989 [details] scrollblock.html [GTK][WPE][Coordinated Graphics] async scroll causes flickering tiles 1. Load the content 2. Send some wheel events to scroll the page by about 2 window heights to show unpainted tiles 3. Wait for about 5 seconds to start the overlay scrollbars disappearing animation 4. Some tiles are flickering This is hard to reproduce. Repeat these steps 10-20 times.
Attachments
scrollblock.html (1.19 KB, text/html)
2026-01-13 18:39 PST, Fujii Hironori 		no flags
Details
screen capture (12.26 MB, video/x-matroska)
2026-01-13 19:29 PST, Fujii Hironori 		no flags
Details
View All Add attachment proposed patch, testcase, etc.
Fujii Hironori
Comment 1 2026-01-13 19:29:28 PST
Created attachment 477990 [details] screen capture
Fujii Hironori
Comment 2 2026-01-13 20:13:56 PST
Disabling DAMAGE_TRACKING make the problem not happening. diff --git a/Source/WTF/wtf/PlatformEnableGlib.h b/Source/WTF/wtf/PlatformEnableGlib.h index a50993596280..81848a153a0f 100644 --- a/Source/WTF/wtf/PlatformEnableGlib.h +++ b/Source/WTF/wtf/PlatformEnableGlib.h @@ -72,5 +72,5 @@ #endif #if ENABLE(WPE_PLATFORM) || PLATFORM(GTK) -#define ENABLE_DAMAGE_TRACKING 1 +#define ENABLE_DAMAGE_TRACKING 0 #endif
Fujii Hironori
Comment 3 2026-02-04 22:04:41 PST
Pull request: https://github.com/WebKit/WebKit/pull/57931
EWS
Comment 4 2026-02-06 17:03:42 PST
Committed 306987@main (c898f5980bec): <https://commits.webkit.org/306987@main> Reviewed commits have been landed. Closing PR #57931 and removing active labels.
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