https://bugs.documentfoundation.org/show_bug.cgi?id=163145
Bug ID: 163145
Summary: With Skia, lines of transparent-area shapes disappear
during animation
Product: LibreOffice
Version: 7.1.0.3 release
Hardware: All
OS: All
Status: UNCONFIRMED
Keywords: bisected, regression
Severity: normal
Priority: medium
Component: Impress
Assignee: [email protected]
Reporter: [email protected]
Created attachment 196675
--> https://bugs.documentfoundation.org/attachment.cgi?id=196675&action=edit
A sample animation
The presentation has a single slide with three objects; the one below the two
others (i.e., on the background: the circle) has a fade-out animation. The two
rectangles atop of the circle are different by the fill: in the upper one, the
fill is 50% transparent, and in the lower one, it's 100% transparent.
Running the presentation using Skia (both SW and Vulkan), during the animation:
1. The line of the fully-transparent-area rectangle (the lower one) disappears
over the circle;
2. The line of the partially-transparent rectangle (the upper one) is cut off
by half;
3. The circle is not visible through the semi-transparent area of the upper
rectangle.
With Skia disabled, it works as expected.
This is a regression from commit 6f224a17dbf635319503a81ce4038b1ae2ad6de0 (make
vclcanvas try directly VCL for drawing stroked polygon (tdf#136933),
29-09-2020).
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