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Updated README section re:disabling High DPI for SDL2 & SDL3 applications (incl. links to documentation)

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Morgan Aldridge committed 2026-05-29 17:13:14 -04:00
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@@ -65,14 +65,16 @@ xrdb -merge $HOME/.Xdefaults
### Disable High DPI
Unfortunately, MLVWM does not support High DPI (a.k.a. HiDPI) resolution scaling, only a traditional 1:1 pixel scaling factor. It's suggested to add the following to your `~/.xinitrx` or `~/.xsession` to disable High DPI in GTK & Qt X11 applications:
Unfortunately, MLVWM does not support High DPI (a.k.a. HiDPI) resolution scaling, only a traditional 1:1 pixel scaling factor. It's suggested to add the following to your `~/.xinitrx` or `~/.xsession` to disable High DPI in GTK, Qt, and SDL X11 applications:
```
# Disable HiDPI for GTK & Qt X11 applications
export QT_ENABLE_HIGHDPI_SCALING=0 # Qt >= 5.14
export QT_AUTO_SCREEN_SCALE_FACTOR=0 # Qt < 5.14
# Disable High DPI for GTK/Qt/SDL X11 applications
export GDK_SCALE=1 # GTK
export QT_AUTO_SCREEN_SCALE_FACTOR=0 # Qt < 5.14
export QT_SCALE_FACTOR=1
export GDK_SCALE=1
export QT_ENABLE_HIGHDPI_SCALING=0 # Qt >= 5.14
export SDL_VIDEO_HIGHDPI_DISABLED=1 # SDL2
export SDL_VIDEO_X11_SCALING_FACTOR=1.0 # SDL3 >= 3.2.0
```
For further details on High DPI in X11 applications, see:
@@ -80,6 +82,12 @@ For further details on High DPI in X11 applications, see:
* [GTK 4: Using GTK with X11 (X11-specific environment variables)](https://docs.gtk.org/gtk4/x11.html#x11-specific-environment-variables)
* [Qt 6.9: Graphics > High DPI (Environment Variable Reference)](https://doc.qt.io/qt-6/highdpi.html#environment-variable-reference)
* [Qt 5.15: High DPI Displays (High DPI Support in Qt)](https://qthub.com/static/doc/qt5/qtdoc/highdpi.html#high-dpi-support-in-qt)
* [SDL2: FAQ - Using SDL (What environment variables are used by SDL?)](https://wiki.libsdl.org/SDL2/FAQUsingSDL#what_environment_variables_are_used_by_sdl)
* [SDL2 `SDL_hints.h`)(https://github.com/libsdl-org/SDL/blob/SDL2/include/SDL_hints.h) (see `SDL_HINT_VIDEO_HIGHDPI_DISABLED`)
* [SDL3: FAQ - Using SDL3 (What environment variables are used by SDL?)](https://wiki.libsdl.org/SDL3/FAQUsingSDL)
* [SDL3: Environment Variables](https://wiki.libsdl.org/SDL3/EnvironmentVariables)
* [`SDL_HINT_VIDEO_X11_SCALING_FACTOR`](https://wiki.libsdl.org/SDL3/SDL_HINT_VIDEO_X11_SCALING_FACTOR)
* [SDL3 `SDL_hints.h`)(https://github.com/libsdl-org/SDL/blob/main/include/SDL3/SDL_hints.h) (see `SDL_HINT_VIDEO_X11_SCALING_FACTOR`)
### GTK+ 3