SDL Wiki
(This function is part of SDL_ttf, a separate library from SDL.)


Create a font from a file, using target resolutions (in DPI).

Header File

Defined in <SDL3_ttf/SDL_ttf.h>


TTF_Font * TTF_OpenFontIndexDPI(const char *file, int ptsize, long index, unsigned int hdpi, unsigned int vdpi);

Function Parameters

const char * file path to font file.
int ptsize point size to use for the newly-opened font.
long index index of the face in the font file.
unsigned int hdpi the target horizontal DPI.
unsigned int vdpi the target vertical DPI.

Return Value

(TTF_Font *) Returns a valid TTF_Font, or NULL on error.


DPI scaling only applies to scalable fonts (e.g. TrueType).

Some .fon fonts will have several sizes embedded in the file, so the point size becomes the index of choosing which size. If the value is too high, the last indexed size will be the default.

Some fonts have multiple "faces" included. The index specifies which face to use from the font file. Font files with only one face should specify zero for the index.

When done with the returned TTF_Font, use TTF_CloseFont() to dispose of it.


This function is available since SDL_ttf 3.0.0.

See Also

CategoryAPI, CategoryAPIFunction

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