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/*
* font.h -- `Soft' font definitions
*
* Created 1995 by Geert Uytterhoeven
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive
* for more details.
*/
#ifndef _VIDEO_FONT_H
#define _VIDEO_FONT_H
#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;
}
void font_data_get(font_data_t *fd);
bool font_data_put(font_data_t *fd);
unsigned int font_data_size(font_data_t *fd);
bool font_data_is_equal(font_data_t *lhs, font_data_t *rhs);
/*
* Font description
*/
struct font_desc {
int idx;
const char *name;
unsigned int width, height;
unsigned int charcount;
font_data_t *data;
int pref;
};
#define VGA8x8_IDX 0
#define VGA8x16_IDX 1
#define PEARL8x8_IDX 2
#define VGA6x11_IDX 3
#define FONT7x14_IDX 4
#define FONT10x18_IDX 5
#define SUN8x16_IDX 6
#define SUN12x22_IDX 7
#define ACORN8x8_IDX 8
#define MINI4x6_IDX 9
#define FONT6x10_IDX 10
#define TER16x32_IDX 11
#define FONT6x8_IDX 12
#define TER10x18_IDX 13
extern const struct font_desc font_vga_8x8,
font_vga_8x16,
font_pearl_8x8,
font_vga_6x11,
font_7x14,
font_10x18,
font_sun_8x16,
font_sun_12x22,
font_acorn_8x8,
font_mini_4x6,
font_6x10,
font_ter_16x32,
font_6x8,
font_ter_10x18;
/* Find a font with a specific name */
extern const struct font_desc *find_font(const char *name);
/* Get the default font for a specific screen size */
extern const struct font_desc *get_default_font(int xres, int yres,
unsigned long *font_w,
unsigned long *font_h);
/* Max. length for the name of a predefined font */
#define MAX_FONT_NAME 32
/* Extra word getters */
#define REFCOUNT(fd) (((int *)(fd))[-1])
#define FNTSIZE(fd) (((int *)(fd))[-2])
#define FNTSUM(fd) (((int *)(fd))[-4])
#define FONT_EXTRA_WORDS 4
struct font_data {
unsigned int extra[FONT_EXTRA_WORDS];
const unsigned char data[];
} __packed;
#endif /* _VIDEO_FONT_H */
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