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Document that applications are always DPI-aware with wxGTK

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Also mention that fractional scaling is not currently supported under
this platform.

See #23441.
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Vadim Zeitlin 2023-04-13 14:57:16 +02:00
parent 71a64c25fa
commit 030dd6d79b
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docs/doxygen/overviews/high_dpi.md
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@ -307,7 +307,7 @@ programs involves doing at least the following:
Platform-Specific Build Issues {#high_dpi_platform_specific}
==============================
Generally speaking, all systems handle applications not specifically marked as
Some platforms handle applications not specifically marked as
being "DPI-aware" by emulating low-resolution display for them and scaling them
up, resulting in blurry graphics and fonts, but globally preserving the
application appearance. For the best results, the application needs to be
@ -337,3 +337,15 @@ DPI-aware applications must set their `NSPrincipalClass` to `wxNSApplication`
resolution guidelines][apple-highdpi] for more information.
[apple-highdpi]: https://developer.apple.com/library/archive/documentation/GraphicsAnimation/Conceptual/HighResolutionOSX/Explained/Explained.html
GTK {#high_dpi_platform_gtk}
---
GTK 3 doesn't require anything special to be done and, in fact, doesn't support
scaling the application up automatically, i.e. all applications are DPI-aware.
However wxGTK only supports integer scaling factors currently and fractional
scales are rounded to the closest integer.
Older GTK 2 doesn't support application-level DPI-awareness at all and only
supports scaling them up globally on high DPI displays by setting `GDK_SCALE`
or `GDK_DPI_SCALE` environment variables.