typedef struct Sdopts Sdopts;typedef struct Sfont Sfont;#pragma incomplete Sfont struct Sdopts {	int prefilter;	float gamma;}; struct Sfontinfo {	char *family;	char *subfamily;	}; Sfont *pt_font(uchar *data, float height);void pt_freefont(Sfont *f);Rectangle pt_textrect(Sfont *f, char *s);Image *pt_textdraw(Sfont *f, char *s, Rectangle rect, Sdopts *opts);