https://bugs.documentfoundation.org/show_bug.cgi?id=141980
Bug ID: 141980
Summary: Writer 'smooth scroll' choppy with Skia/Vulkan
Product: LibreOffice
Version: 7.2.0.0.alpha0+ Master
Hardware: All
OS: All
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: graphics stack
Assignee: libreoffice-bugs@lists.freedesktop.org
Reporter: vstuart.fo...@utsa.edu
On a Dell Windows 10 4K HiDPI laptop with Intel GPU driver (27.20.100.9466)
Running current TB77 nightly
Version: 7.2.0.0.alpha0+ (x64) / LibreOffice Community
Build ID: f616d96bd8ce8986e4cc204953db0467e6060b5c
CPU threads: 12; OS: Windows 10.0 Build 19042; UI render: Skia/Vulkan; VCL: win
Locale: en-US (en_US); UI: en-US
Calc: CL
Gives skia.log
RenderMethod: vulkan
Vendor: 0x8086
Device: 0x3e9b
API: 1.2.170
Driver: 0.402.1274
DeviceType: integrated
DeviceName: Intel(R) UHD Graphics 630
Denylisted: no
Enabling Writer's "Smooth scroll" (Tools -> Options -> LibreOfficeDev Writer ->
View)
With Skia:
1) Skia/Vulkan the buffer swaps get very choppy, and the Skia performance check
would toggle the mode selector to Raster.
2) restarting with Skia/Raster the buffer swaps and effective "scroll" is
animated *very* slowly, just creeping up or down (but somewhat smooth).
Default GDI:
view port buffering with default GDI rendering and Writer "Smooth scroll"
enabled was reasonable speed. Either on the Down/Up arrows, or the scroll bar
below or above the Thumb.
Why would Skia/Vulkan be that choppy?
Rather than throwing the Intel Vulkan 0.402.1274 into the deny list, is there
something to be done with the Smooth scroll?
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