Bug 213004

Summary: [WinCairo] Resizing window causes rendering glitches in accelerated compositing mode
Product: WebKit Reporter: Fujii Hironori <fujii.hironori>
Component: PlatformAssignee: Nobody <webkit-unassigned>
Status: NEW    
Severity: Normal    
Priority: P2    
Version: WebKit Nightly Build   
Hardware: Unspecified   
OS: Unspecified   
Attachments:
Description Flags
[Patch] eglWaitNative workaround for WebKit1
none
[Patch] ANGLE_window_fixed_size none

Fujii Hironori
Reported 2020-06-09 17:37:18 PDT
[WinCairo] Resizing window causes rendering glitches in accelerated compositing mode 1. Start WinCairo MiniBrowser of WebKit1 or WebKit2 2. Go to accelerated compositing mode page. For example, https://webkit.org/ and https://webkit.org/blog-files/3d-transforms/perspective-by-example.html 3. Resize the browser window wider and narrower 4. The content are distorted temporarily. This issue happens both for WK1 and WK2 of WinCairo. But, I think they aren't exactly same issue because of WK2's cross-process painting.
Attachments
[Patch] eglWaitNative workaround for WebKit1 (829 bytes, patch)
2020-06-09 17:39 PDT, Fujii Hironori 		no flags
DetailsFormatted DiffDiff
[Patch] ANGLE_window_fixed_size (6.39 KB, patch)
2020-06-09 17:42 PDT, Fujii Hironori 		no flags
DetailsFormatted DiffDiff
View All Add attachment proposed patch, testcase, etc.
Fujii Hironori
Comment 1 2020-06-09 17:38:21 PDT
Reported the bug to upsteam ANGLE. 4665 - D3D11: Resizing window is causing rendering gliches - angleproject https://crbug.com/angleproject/4665
Fujii Hironori
Comment 2 2020-06-09 17:39:55 PDT
Created attachment 401499 [details] [Patch] eglWaitNative workaround for WebKit1 eglWaitNative workaround works only for WebKit1. https://bugs.chromium.org/p/angleproject/issues/detail?id=4665#c2
Fujii Hironori
Comment 3 2020-06-09 17:42:56 PDT
Created attachment 401500 [details] [Patch] ANGLE_window_fixed_size ANGLE has ANGLE_window_fixed_size extension. It was introduced in the following bug. 320021 - Chrome renders window incorrectly on restore from minimize. - chromium https://bugs.chromium.org/p/chromium/issues/detail?id=320021 I tried ANGLE_window_fixed_size extension in WinCairo WK1 and WK2, but it doesn't solve the bug.
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