WSFONT(9)              NetBSD 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 struc-
     ture 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 modi-
              fied 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 fail-
              ure.

     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)

NetBSD 7.0                     January 13, 2012                     NetBSD 7.0

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