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#ifndef _FB_FONT_H
#define _FB_FONT_H
#include <stdint.h>
#include <unistd.h>
/*
Example:
Font Helvetica 14
Character W ('X' and '.' is the character font data)
X.....X......&...
X.....X......X...
X....X.X.....X...
.X...X.X....X....
.X...X.X....X....
.X...X.X....X....
..X.X....X.X.....
..X.X....X.X.....
..X.X....X.X.....
...X......X......
@%..X......X...$..
<---dwidth---->
@ is the cursor position (origin) for this character
$ is the cursor position (origin) for the next character
% is the character boundingbox origin,
& is the character boundingbox top right corner
*/
/* data for char c is found by getting the index into the
chardata array from the charoffs array.
if charoffs[c] == FB_FONT_NOCHAR, then this glyph does
not exist! Better use the convenience function fb_font_get_char below! */
#define FB_FONT_NOCHAR 0xffff
struct fb_font {
int8_t height; /* total height of font */
int8_t ascent; /* topmost pixel is "ascend" above
current cursor position y */
uint8_t firstchar,lastchar; /* range of characters in font (iso8859-1) */
uint8_t const *chardata;
uint16_t const *charoffs; /* byte offsets relative to chardata */
uint8_t const *widths; /* widths for characters */
};
struct fb_char {
int8_t width;
int8_t bbox_w,bbox_h,bbox_x,bbox_y;
uint8_t data[0];
};
/* there are currently 6 fonts available, Helvetica 8, 14, 24 point
in bold and regular shapes. The following enum has to match the
order of the array fb_fonts in framebuffer.c!
*/
enum fb_font_id {
// FB_FONT_4X6,
// FB_FONT_5X8,
FB_FONT_HELVR08,
// FB_FONT_HELVR14
// FB_FONT_HELVR24,
// FB_FONT_HELVB08,
FB_FONT_HELVB14,
// FB_FONT_HELVB24,
FB_FONT_C64,
FB_FONT_SYMBOLS,
};
extern const struct fb_font *fb_fonts[]; // note: has to match fb_font_id enum!
extern const struct fb_char *
fb_font_get_char(const struct fb_font *fnt,unsigned char c);
#endif
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