Bug 129120 - Skia text rendering on Windows, 'off by one' as canvas is scrolled
Summary: Skia text rendering on Windows, 'off by one' as canvas is scrolled
Status: RESOLVED DUPLICATE of bug 129211
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: graphics stack (show other bugs)
Version:
(earliest affected)
7.0.0.0.alpha0+
Hardware: All All
: medium normal
Assignee: Not Assigned
URL:
Whiteboard:
Keywords:
Depends on:
Blocks: Skia
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Reported: 2019-11-30 21:11 UTC by V Stuart Foote
Modified: 2019-12-12 15:41 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:

Attachments
transient 'off by one' lines in scrolling text Skia rendering (44.22 KB, image/png)
2019-11-30 21:11 UTC, V Stuart Foote 		Details
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Description V Stuart Foote 2019-11-30 21:11:39 UTC 
Created attachment 156207 [details]
transient '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.
Comment 1 BogdanB 2019-12-09 16:14:47 UTC 
I had sometimes this lines, but not always. I can't prove it.

Version: 6.5.0.0.alpha0+
Build ID: 5030be4e85179147476b1e441eb618fb6ed58235
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3; 
TinderBox: Linux-rpm_deb-x86_64@86-TDF, Branch:master, Time: 2019-11-28_20:14:48
Locale: ro-RO (ro_RO.UTF-8); UI-Language: en-US
Calc: threaded
Comment 2 Luboš Luňák 2019-12-12 15:41:29 UTC 

*** This bug has been marked as a duplicate of bug 129211 ***