diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/font.h | 47 |
1 files changed, 46 insertions, 1 deletions
diff --git a/include/linux/font.h b/include/linux/font.h index d929c5fa32ca..746a0996a018 100644 --- a/include/linux/font.h +++ b/include/linux/font.h @@ -13,12 +13,57 @@ #include <linux/types.h> +/* + * font_data_t and helpers + */ + +/** + * font_data_t - Raw font data + * + * Values of type font_data_t store a pointer to raw font data. The format + * is monochrome. Each bit sets a pixel of a stored glyph. Font data does + * not store geometry information for the individual glyphs. Users of the + * font have to store glyph size, pitch and character count separately. + * + * Font data in font_data_t is not equivalent to raw u8. Each pointer stores + * an additional hidden header before the font data. The layout is + * + * +------+-----------------------------+ + * | -16 | CRC32 Checksum (optional) | + * | -12 | <Unused> | + * | -8 | Number of data bytes | + * | -4 | Reference count | + * +------+-----------------------------+ + * | 0 | Data buffer | + * | ... | | + * +------+-----------------------------+ + * + * Use helpers to access font_data_t. Use font_data_buf() to get the stored data. + */ +typedef const unsigned char font_data_t; + +/** + * font_data_buf() - Returns the font data as raw bytes + * @fd: The font data + * + * Returns: + * The raw font data. The provided buffer is read-only. + */ +static inline const unsigned char *font_data_buf(font_data_t *fd) +{ + return (const unsigned char *)fd; +} + +/* + * Font description + */ + struct font_desc { int idx; const char *name; unsigned int width, height; unsigned int charcount; - const void *data; + font_data_t *data; int pref; }; |