When high-dpi is enabled, we would previously default to
QFont::PreferVerticalHinting which maps to the asymmetric
antialiasing strategy, where only horizontal antialiasing is
enabled.
The idea behind this is that it provides crisper text,
especially for smaller font sizes, but for larger font sizes
the aliasing artifacts outweigh the added sharpness.
Inspecting native Windows applications, such as the system
settings, it looks like asymmetric antialiasing is used
up to a certain font size threshold. The documentation uses
a font size of 16 as the suggested threshold.
In accordance with the documentation, we use PreferNoHinting
for font sizes above this threshold.
[ChangeLog][Windows] When high-dpi scaling is active, the
default text antialiasing has been set to symmetric for
larger fonts (pixel size higher than 16 px). The old default
can be selected manually as QFont::PreferVerticalHinting.
Fixes: QTBUG-99066
Change-Id: Ibf53556f6e2cbbe1dc5d30c6c1743a499a99a90b
Reviewed-by: Lars Knoll <lars.knoll@qt.io>
2e29a427ca