(This is the legacy documentation for stable SDL2, the current stable version; SDL3 is the current development version.)

SDL_HINT_WINDOWS_DPI_SCALING

Uses DPI-scaled points as the SDL coordinate system on Windows.

Header File

Syntax

#define SDL_HINT_WINDOWS_DPI_SCALING "SDL_WINDOWS_DPI_SCALING"

Remarks

This changes the SDL coordinate system units to be DPI-scaled points, rather than pixels everywhere. This means windows will be appropriately sized, even when created on high-DPI displays with scaling.

e.g. requesting a 640x480 window from SDL, on a display with 125% scaling in Windows display settings, will create a window with an 800x600 client area (in pixels).

Setting this to "1" implicitly requests process DPI awareness (setting SDL_WINDOWS_DPI_AWARENESS is unnecessary), and forces SDL_WINDOW_ALLOW_HIGHDPI on all windows.

This variable can be set to the following values:

"0": SDL coordinates equal Windows coordinates. No automatic window resizing when dragging between monitors with different scale factors (unless this is performed by Windows itself, which is the case when the process is DPI unaware).
"1": SDL coordinates are in DPI-scaled points. Automatically resize windows as needed on displays with non-100% scale factors.

CategoryAPI, CategoryAPIMacro

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