Get the content display scale relative to a window's pixel size.
float SDL_GetWindowDisplayScale(SDL_Window *window);
|window||the window to query|
Returns the display scale, or 0.0f on failure; call SDL_GetError() for more information.
This is a combination of the window pixel density and the display content scale, and is the expected scale for displaying content in this window. For example, if a 3840x2160 window had a display scale of 2.0, the user expects the content to take twice as many pixels and be the same physical size as if it were being displayed in a 1920x1080 window with a display scale of 1.0.
Conceptually this value corresponds to the scale display setting, and is updated when that setting is changed, or the window moves to a display with a different scale setting.
This function is available since SDL 3.0.0.