[Libreoffice-bugs] [Bug 119020] Icons are corrupted on Windows when scaling UI 150% and higher, with some OpenGL dependency

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=119020

--- Comment #41 from V Stuart Foote <vstuart.foote at utsa.edu> ---
On Windows 10 Pro 64-bit (1803) en-US with nVidia GTX 750ti with 3840x2160 40"
(~110.15 dpi)
Version: 6.2.0.0.alpha1+
Build ID: 4fa9e6f7f891b335ae1b432e0848c1e46c8fe3ef
CPU threads: 8; OS: Windows 10.0; UI render: GL; VCL: win; 
TinderBox: Win-x86 at 42, Branch:master, Time: 2018-10-30_22:44:48
Locale: en-US (en_US); Calc: CL

With OpenGL rendering enabled and scaling UI to 300% to force LO icon
scaling--all of the icon themes scale cleanly if a bit pixelated but without
any color corruption. Will check a 64-bit build (TB42 or TB62) when one rolls.

@Jan-Marek, Tomaž -- notice we've been using the "BMPScaleFlag::Fast" [1], any
reason not to use Lanczos or at least BiCubic to reduce pixelation since these
scaled icon themes are being cached to user profile on first launch? Better at
least until SVG themes can be finished.

And assuming 64-bit also is also good, can this be back ported for 6.1.4?

=-ref-=
[1]
https://opengrok.libreoffice.org/xref/core/vcl/source/image/ImplImageTree.cxx#187

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