1 files changed, 82 insertions, 0 deletions
diff --git a/src/target/firmware/include/fb/font.h b/src/target/firmware/include/fb/font.h
new file mode 100644
index 00000000..9dee8ffb
--- /dev/null
+++ b/src/target/firmware/include/fb/font.h
@@ -0,0 +1,82 @@
+#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
+