WSFONT(9)

WSFONT(9) | Kernel Developer's Manual | WSFONT(9)

# NAME

wsfont, wsfont_init, wsfont_matches, wsfont_find, wsfont_add, wsfont_remove, wsfont_enum, wsfont_lock, wsfont_unlock, wsfont_map_unichar — wscons font support

# SYNOPSIS

#include <dev/wscons/wsconsio.h>
#include <dev/wsfont/wsfont.h>

void
wsfont_init(void);

int
wsfont_matches(struct wsdisplay_font *font, const char *name, int width, int height, int stride, int flags);

int
wsfont_find(const char *name, int width, int height, int stride, int bitorder, int byteorder, int flags);

int
wsfont_add(struct wsdisplay_font *font, int copy);

int
wsfont_remove(int cookie);

void
wsfont_enum(void (*callback)(const char *, int, int, int));

int
wsfont_lock(int cookie, struct wsdisplay_font **ptr);

int
wsfont_unlock(int cookie);

int
wsfont_map_unichar(struct wsdisplay_font *font, int c);

# DESCRIPTION

The wsfont module is a component of the wscons(9) framework to provide access to display fonts. Fonts may be loaded dynamically into the kernel or included statically in the kernel at compile time. Display drivers which emulate a glass-tty console on a bit-mapped display can add, remove and find fonts for use by device-dependent blitter operations.

The primary data type for manipulating fonts is the wsdisplay_font structure in dev/wscons/wsconsio.h:

    struct wsdisplay_font {
    	const char *name;	/* font name */
    	int firstchar;
    	int numchars;		/* size of font table */
    	int encoding;		/* font encoding */
    	u_int fontwidth;	/* character width */
    	u_int fontheight;	/* character height */
    	u_int stride;
    	int bitorder;
    	int byteorder;
    	void *data;		/* pointer to font table */
    };

The maximum font table size is WSDISPLAY_MAXFONTSZ.

The wsfont framework supports fonts with the following encodings:

WSDISPLAY_FONTENC_ISO
  ISO-encoded fonts.
WSDISPLAY_FONTENC_IBM
  IBM-encoded fonts commonly available for IBM CGA, EGA and VGA display adapters.
WSDISPLAY_FONTENC_PCVT
  PCVT-encoding fonts distributed as part of the old PCVT terminal emulation driver.
WSDISPLAY_FONTENC_ISO7
  ISO-encoded Greek fonts.
WSDISPLAY_FONTENC_ISO2
  ISO-encoded East European fonts.

# FUNCTIONS

wsfont_init(void)
  Initialise the font list with the built-in fonts.
wsfont_matches(font, name, width, height, stride)
  Matches the font font with the specifications name, width, height, stride and flags. Return zero if not matched and non-zero if matched. The flags parameter has the same meaning as in wsfont_find().
wsfont_find(name, width, height, stride, bitorder, byteorder, flags)
  Find the font called name from the fonts loaded into the kernel. The font aspect is specified by width, height, and stride. If wsfont_find() is called with any of the parameters as 0, it indicates that we don't care about that aspect of the font. If the font is found, a (nonnegative-valued) cookie is returned which can be used with the other functions.

  The bitorder and byteorder arguments are the bit order and byte order required. Valid values are:

  WSDISPLAY_FONTORDER_KNOWN
    The font is in known ordered format and doesn't need converting.
  WSDISPLAY_FONTORDER_L2R
    The font is ordered left to right.
  WSDISPLAY_FONTORDER_R2L
    The font is ordered right to left.

  The flags parameter determines what type of font can be returned. Any combination of the following values is allowed:

  WSFONT_FIND_BITMAP
    To search bitmap fonts,
  WSFONT_FIND_ALPHA
    to search anti-aliased fonts.
  When more flexibility is required, wsfont_enum() should be used.
wsfont_add(font, copy)
  Add a font font to the font list. If the copy argument is non-zero, then the font is physically copied, otherwise a reference to the original font is made.
wsfont_remove(cookie)
  Remove the font specified by cookie from the font list. The value of cookie was returned by wsfont_add().
wsfont_enum(callback)
  Enumerate the list of fonts. For each font in the font list, the callback function argument is called with the arguments specifying the font name, width, height and stride.
wsfont_lock(cookie, ptr)
  Lock access to the font specified by cookie so that it cannot be unloaded from the kernel while is being used. If the bit or byte order of the font to be locked differs from what has been requested with wsfont_find() then the glyph data will be modified to match. At this point it may be necessary for wsfont_lock() to make a copy of the font data; this action is transparent to the caller. A later call to wsfont_unlock() will free resources used by temporary copies.

  The address of the wsdisplay_font pointer for the specified font is returned in the ptr argument.

  wsfont_lock() returns zero on success, or an error code on failure.

wsfont_unlock(cookie)
  Unlock the font specified by cookie. Returns zero on success, or an error code on failure.
wsfont_map_unichar(font, c)
  Remap the unicode character c to glyph for font font. Returns the glyph on success or -1 on error.

# CODE REFERENCES

The wscons subsystem is implemented within the directory sys/dev/wscons. The wsfont subsystem itself is implemented within the file sys/dev/wsfont/wsfont.c.

# SEE ALSO

wsfont(4), wsfontload(8), autoconf(9), driver(9), intro(9), wscons(9), wsdisplay(9)

January 13, 2012 | NetBSD 5.99