DOKK / manpages / debian 13 / libsdl3-ttf-doc / TTF_SetFontSizeDPI.3.en
TTF_SetFontSizeDPI(3) SDL_ttf3 FUNCTIONS TTF_SetFontSizeDPI(3)

TTF_SetFontSizeDPI - Set font size dynamically with target resolutions, in dots per inch.

Defined in SDL3_ttf/SDL_ttf.h

#include "SDL3_ttf/SDL_ttf.h"
bool TTF_SetFontSizeDPI(TTF_Font *font, float ptsize, int hdpi, int vdpi);

This updates any TTF_Text
objects using this font, and clears already-generated glyphs, if any, from the cache.

the font to resize.
the new point size.
the target horizontal DPI.
the target vertical DPI.

Returns true on success or false on failure; call SDL_GetError() for more information.

This function should be called on the thread that created the font.

This function is available since SDL_ttf 3.0.0.

(3), TTF_GetFontSize(3), (3), TTF_GetFontSizeDPI(3)

SDL_ttf 3.2.2 SDL_ttf