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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/math.h>
#include <linux/types.h>
struct console_font;
/*
* Glyphs
*/
/**
* font_glyph_pitch - Calculates the number of bytes per scanline
* @width: The glyph width in bits per scanline
*
* A glyph's pitch is the number of bytes in a single scanline, rounded
* up to the next full byte. The parameter @width receives the number
* of visible bits per scanline. For example, if width is 14 bytes per
* scanline, the pitch is 2 bytes per scanline. If width is 8 bits per
* scanline, the pitch is 1 byte per scanline.
*
* Returns:
* The number of bytes in a single scanline of the glyph
*/
static inline unsigned int font_glyph_pitch(unsigned int width)
{
return DIV_ROUND_UP(width, 8);
}
/**
* font_glyph_size - Calculates the number of bytes per glyph
* @width: The glyph width in bits per scanline
* @vpitch: The number of scanlines in the glyph
*
* The number of bytes in a glyph depends on the pitch and the number
* of scanlines. font_glyph_size automatically calculates the pitch
* from the given width. The parameter @vpitch gives the number of
* scanlines, which is usually the glyph's height in scanlines. Fonts
* coming from user space can sometimes have a different vertical pitch
* with empty scanlines between two adjacent glyphs.
*/
static inline unsigned int font_glyph_size(unsigned int width, unsigned int vpitch)
{
return font_glyph_pitch(width) * vpitch;
}
/*
* 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_data_t *font_data_import(const struct console_font *font, unsigned int vpitch,
u32 (*calc_csum)(u32, const void *, size_t));
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);
int font_data_export(font_data_t *fd, struct console_font *font, unsigned int vpitch);
/* font_rotate.c */
void font_glyph_rotate_90(const unsigned char *glyph, unsigned int width, unsigned int height,
unsigned char *out);
void font_glyph_rotate_180(const unsigned char *glyph, unsigned int width, unsigned int height,
unsigned char *out);
void font_glyph_rotate_270(const unsigned char *glyph, unsigned int width, unsigned int height,
unsigned char *out);
unsigned char *font_data_rotate(font_data_t *fd, unsigned int width, unsigned int height,
unsigned int charcount, unsigned int steps,
unsigned char *buf, size_t *bufsize);
/*
* Font description
*/
struct font_desc {
int idx;
const char *name;
unsigned int width, height;
unsigned int charcount;
font_data_t *data;
int pref;
};
/* 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
/*
* Built-in fonts
*/
extern const struct font_desc font_10x18;
extern const struct font_desc font_6x10;
extern const struct font_desc font_6x8;
extern const struct font_desc font_7x14;
extern const struct font_desc font_acorn_8x8;
extern const struct font_desc font_mini_4x6;
extern const struct font_desc font_pearl_8x8;
extern const struct font_desc font_sun_12x22;
extern const struct font_desc font_sun_8x16;
extern const struct font_desc font_ter_10x18;
extern const struct font_desc font_ter_16x32;
extern const struct font_desc font_vga_6x11;
extern const struct font_desc font_vga_8x16;
extern const struct font_desc font_vga_8x8;
#endif /* _VIDEO_FONT_H */
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