[Libreoffice-bugs] [Bug 129120] New: Skia text rendering on Windows, 'off by one' as canvas is scrolled

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=129120

            Bug ID: 129120
           Summary: Skia text rendering on Windows, 'off by one' as canvas
                    is scrolled
           Product: LibreOffice
           Version: 6.5.0.0.alpha0+ Master
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: medium
         Component: graphics stack
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: vstuart.foote at utsa.edu

Created attachment 156207
  --> https://bugs.documentfoundation.org/attachment.cgi?id=156207&action=edit
transietn 'off by one' lines in scrolling text Skia rendering

On Windows 10 Home 64-bit en-US with Intel HD Graphics 620 supporting Vulkan
1.1.114 with build Version: 6.5.0.0.alpha0+ (x64)
Build ID: ecc56435094e23165eb30db4d7f6a7e6aab0b47e
CPU threads: 4; OS: Windows 10.0 Build 18362; UI render: Skia/Vulkan; VCL: win; 
Locale: en-US (en_US); UI-Language: en-US
Calc: threaded

With the new Skia based rendering, scrolling a page of text shows horizontal
lines that advance up the srolled page. They line up across the bottom edge of
document canvas as it is exposed when scrolled into view. As if the canvas is
off by one. 

The effect is visual and transient, and lines clear when canvas is redrawn by
focus away and return.

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