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-/* dynafont.h - Interfaces for the dynamic font handling.
- Copyright (C) 2002 Free Software Foundation, Inc.
- Written by Marcus Brinkmann.
-
- This file is part of the GNU Hurd.
-
- The GNU Hurd is free software; you can redistribute it and/or
- modify it under the terms of the GNU General Public License as
- published by the Free Software Foundation; either version 2, or (at
- your option) any later version.
-
- The GNU Hurd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA. */
-
-#include <wchar.h>
-
-#include "bdf.h"
-
-
-/* The dynafont interface does not do locking on its own, for maximum
- efficiency it relies on locking by the caller (because usually the
- caller has some other data structures to lock along with the
- dynafont. However, it is safe to call two functions on different
- dynafonts asynchronously. */
-typedef struct dynafont *dynafont_t;
-
-/* Some glyphs are always available at a fixed location. This
- includes the representation for the unknown glyph and the blank.
- Conveniently, the blank is located at its position in ASCII. */
-#define FONT_INDEX_UNKNOWN 0
-#define FONT_INDEX_SPACE 32
-
-/* Create a new dynafont object, which uses glyphs from the font FONT
- (which must be 8 pixels wide and up to 32 pixels heigh). SIZE is
- either 256 or 512, and specifies the number of available glyphs in
- the font cache. The object is returned in DYNAFONT. The caller
- must ensure the integrity of FONT until the object is destroyed or
- the font is changed with dynafont_change_font. */
-error_t dynafont_new (bdf_font_t font, int size, dynafont_t *dynafont);
-
-/* Release a dynafont object and its associated resources. */
-void dynafont_free (dynafont_t df);
-
-/* Look up the vga font index for an UCS-4 character. If not already
- mapped, try to find space for a new entry and add the mapping.
- Acquires an additional reference to the character. Might return
- the glyph for the unrepresentable character if the glyph is ot
- available for this character or no free slot is available right
- now. In the former case, some information gets lost (to do
- otherwise, one would have to either assign one of the scarce font
- indices to each undisplayable character value on screen, or to
- store the whole scrollback buffer as wide chars as well to recover
- the lost info from that copy of the original text. */
-int dynafont_lookup (dynafont_t df, wchar_t wide_chr);
-
-/* Release a reference to the glyph VGA_FONT_INDEX in dynafont DF. */
-void dynafont_release (dynafont_t df, int vga_font_index);
-
-/* Load the VGA font to the card and make it active. */
-void dynafont_activate (dynafont_t df);
-
-/* Change the font used by dynafont DF to FONT. This transformation
- is initially loss-less, if the new font can't display some
- characters on the screen, you can always go back to a font that
- does and get the glyphs for those characters back. (However, the
- comments in dynafont_lookup hold for glyphs looked up after the font
- change.) */
-void dynafont_change_font (dynafont_t df, bdf_font_t font);