Man page - ttf_setfontsize(3)

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Manual

TTF_SetFontSize(3) SDL_ttf3 FUNCTIONS TTF_SetFontSize(3)

TTF_SetFontSize - Set a font's size dynamically.

Defined in SDL3_ttf/SDL_ttf.h

#include "SDL3_ttf/SDL_ttf.h"
bool TTF_SetFontSize(TTF_Font *font, float ptsize);

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.

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)

SDL_ttf 3.2.2 SDL_ttf