7. Macfont Info

To reduce the amount of overhead required to print a glyph, variables are read and stored in a struct called macfont_info.

7.1. typedef

<<typedefs>>=
typedef struct {
<<macfont_info>>
} macfont_info;

7.2. init

The macfont_info struct is populated with macfont_info_init. It does this by reading the buffer where the font is located.

<<funcdefs>>=
void macfont_info_init(macfont_info *info, uint8_t *font);
<<funcs>>=
void macfont_info_init(macfont_info *info, uint8_t *font)
{
<<macfont_info_init>>
}

7.3. contents

7.3.1. Bitmaps

<<macfont_info>>=
uint8_t *bitmaps;

7.3.2. Off

<<macfont_info>>=
uint16_t off;
<<read_bitmap_and_off>>=
info->off = ROWWORDS(font) * RECTHEIGHT(font);
<<read_bitmap_and_off>>=
info->bitmaps = BITMAPS(font);

7.3.3. Loctable

<<macfont_info>>=
uint16_t *loctable;
<<macfont_info_init>>=
<<read_bitmap_and_off>>
info->loctable =
    (uint16_t *) (info->bitmaps + (2 * info->off));
<<owtable>>

7.3.4. owtable

<<macfont_info>>=
uint16_t *owtable;
<<owtable>>=
<<read_nchars>>
info->owtable = info->loctable + (info->nchars + 2);

7.3.5. nchars

<<macfont_info>>=
uint16_t nchars;
<<read_nchars>>=
info->nchars = LASTCHAR(font) - FIRSTCHAR(font) + 1;
<<macfont_info>>=
uint16_t stride;
<<macfont_info_init>>=
info->stride = ROWWORDS(font) * 2;

7.3.6. rectheight

<<macfont_info>>=
uint16_t rectheight;
<<macfont_info_init>>=
info->rectheight = RECTHEIGHT(font);

7.3.7. kernmax

<<macfont_info>>=
int16_t kernmax;
<<macfont_info_init>>=
info->kernmax = KERNMAX(font);

7.3.8. firstchar

<<macfont_info>>=
uint16_t firstchar;
<<macfont_info_init>>=
info->firstchar = FIRSTCHAR(font);

7.3.9. font height

<<macfont_info>>=
uint16_t fontheight;
<<macfont_info_init>>=
info->fontheight = ASCENT(font) - DESCENT(font);

7.3.10. ascent + descent

<<macfont_info>>=
uint16_t descent;
uint16_t ascent;
<<macfont_info_init>>=
info->ascent = ASCENT(font);
info->descent = DESCENT(font);

7.4. helper functions

7.4.1. macinfo_fontheight

macinfo_fontheight returns the font height.

<<funcdefs>>=
int macfont_info_fontheight(macfont_info *info);
<<funcs>>=
int macfont_info_fontheight(macfont_info *info)
{
    return info->fontheight;
}

In janet, this is macfont-height.

7.4.2. macinfo_rectheight

macinfo_rectheight returns the font height.

<<funcdefs>>=
int macfont_info_rectheight(macfont_info *info);
<<funcs>>=
int macfont_info_rectheight(macfont_info *info)
{
    return info->rectheight;
}

In janet, this is macfont-height.

7.4.3. macinfo_descent

think it could be needed to dynamically draw symbols in a text string.

<<funcdefs>>=
int macfont_info_descent(macfont_info *info);
<<funcs>>=
int macfont_info_descent(macfont_info *info)
{
    return info->descent;
}

In janet, this is macfont-height.


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