Man page - ttf_setfontsdf(3)

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Package: libsdl3-ttf-doc
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TTF_SetFontSDF - Enable Signed Distance Field rendering for a font.

Defined in SDL3_ttf/SDL_ttf.h

#include "SDL3_ttf/SDL_ttf.h"

bool TTF_SetFontSDF(TTF_Font *font, bool enabled);

SDF is a technique that helps fonts look sharp even when scaling and rotating, and requires special shader support for display.

This works with Blended APIs, and generates the raw signed distance values in the alpha channel of the resulting texture.

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

font

the font to set SDF support on.

enabled

true to enable SDF, false to disable.

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.