summaryrefslogtreecommitdiff
path: root/console/dynafont.c
diff options
context:
space:
mode:
Diffstat (limited to 'console/dynafont.c')
-rw-r--r--console/dynafont.c372
1 files changed, 0 insertions, 372 deletions
diff --git a/console/dynafont.c b/console/dynafont.c
deleted file mode 100644
index cfae051d..00000000
--- a/console/dynafont.c
+++ /dev/null
@@ -1,372 +0,0 @@
-/* dynafont.c - 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 <assert.h>
-#include <malloc.h>
-#include <wchar.h>
-#include <hurd/ihash.h>
-#include <string.h>
-
-#include "vga-hw.h"
-#include "vga.h"
-#include "bdf.h"
-#include "dynafont.h"
-
-
-/* The currently active (visible) dynafont. */
-static dynafont_t active_dynafont;
-
-/* One glyph in a VGA font is 8 pixels wide and 32 pixels high. Only
- the first N lines are visible, and N depends on the VGA register
- settings. */
-typedef char vga_font_glyph[VGA_FONT_HEIGHT];
-
-/* For each glyph in the VGA font, one instance of this structure is
- held in the dynafont. */
-struct mapped_character
-{
- /* Reference count of the mapped character. If this drops zero, we
- can remove the mapping at any time. */
- int refs;
-
- /* Remember the character this glyph belongs to, so the glyph can be
- reloaded when the font is changed. */
- wchar_t character;
-
- /* Used by libihash for fast removal of elements. */
- void **locp;
-};
-
-
-struct dynafont
-{
- /* The sorted font to take the glyphs from. */
- bdf_font_t font;
-
- /* The size of the VGA font (256 or 512). Must be a power of 2! */
- int size;
-
- /* A hash containing a pointer to a struct mapped_character for each
- UCS-4 character we map to a VGA font index. */
- ihash_t charmap;
-
- /* The struct mapped_characters are preallocated for all vga font
- index values. This points to an array of SIZE such elements. */
- struct mapped_character *charmap_data;
-
- /* The last vga font index that had been free (or could be reused). */
- int vga_font_last_free_index;
-
- /* The number of free slots in the VGA font. */
- int vga_font_free_indices;
-
- /* The font memory as stored on the card. */
- vga_font_glyph *vga_font;
-};
-
-
-/* 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)
-{
- error_t err = 0;
- dynafont_t df;
- struct bdf_glyph *glyph = NULL;
-
- df = malloc (sizeof *df);
- if (!df)
- return ENOMEM;
-
- df->font = font;
- df->size = size;
- err = ihash_create (&df->charmap);
- if (err)
- {
- free (df);
- return err;
- }
-
- df->charmap_data = calloc (size, sizeof (struct mapped_character));
- if (!df->charmap_data)
- {
- ihash_free (df->charmap);
- free (df);
- return ENOMEM;
- }
-
- df->vga_font = malloc (sizeof (vga_font_glyph) * size);
- if (!df->vga_font)
- {
- ihash_free (df->charmap);
- free (df->charmap_data);
- free (df);
- return ENOMEM;
- }
- df->vga_font_free_indices = df->size;
- df->vga_font_last_free_index = 0;
-
- /* The encoding of the unknown glyph. Some fonts provide an empty
- box for this encoding. Undefine this if you always want to use
- the built-in font. XXX Make this a command line option. */
-#define ENCODING_UNKNOWN 0
- /* The encoding of the space. All fonts should provide it. */
-#define ENCODING_SPACE 32
-
- {
- struct mapped_character *chr = &df->charmap_data[FONT_INDEX_UNKNOWN];
- df->vga_font_free_indices--;
- chr->refs = 1;
-
-#if defined(ENCODING_UNKNOWN)
- glyph = bdf_find_glyph (df->font, ENCODING_UNKNOWN, 0);
- if (!glyph)
- glyph = bdf_find_glyph (df->font, -1, ENCODING_UNKNOWN);
-#endif
- if (glyph)
- {
- /* XXX Take glyph size into account. */
- memcpy (df->vga_font[FONT_INDEX_UNKNOWN], glyph->bitmap, 32);
- /* Update the hash table. */
- ihash_add (df->charmap, ENCODING_UNKNOWN, chr, &chr->locp);
- }
- else
- {
- int i;
- char *gl = df->vga_font[FONT_INDEX_UNKNOWN];
- /* XXX Take font height into account. */
- gl[0] = 0xFF; /* ******** */
- gl[1] = 0xC3; /* ** ** */
- gl[2] = 0x99; /* * ** * */
- gl[3] = 0x99; /* * ** * */
- gl[4] = 0xF9; /* ***** * */
- gl[5] = 0xF3; /* **** ** */
- gl[6] = 0xF3; /* **** ** */
- gl[7] = 0xE7; /* *** *** */
- gl[8] = 0xE7; /* *** *** */
- gl[9] = 0xFF; /* ******** */
- gl[10] = 0xE7; /* *** *** */
- gl[11] = 0xFF; /* ******** */
- for (i = 12; i < 32; i++)
- gl[i] = 0;
- }
-
-#if defined(ENCODING_SPACE)
- glyph = bdf_find_glyph (df->font, ENCODING_SPACE, 0);
- if (!glyph)
- glyph = bdf_find_glyph (df->font, -1, ENCODING_SPACE);
-#endif
- if (glyph)
- {
- /* XXX Take glyph size into account. */
- memcpy (df->vga_font[FONT_INDEX_SPACE], glyph->bitmap, 32);
- /* Update the hash table. */
- ihash_add (df->charmap, ENCODING_SPACE, chr, &chr->locp);
- }
- else
- {
- int i;
- char *gl = df->vga_font[FONT_INDEX_SPACE];
- for (i = 0; i < 32; i++)
- gl[i] = 0;
- }
- }
- *dynafont = df;
- return err;
-}
-
-
-/* Release a dynafont object and its associated resources. */
-void
-dynafont_free (dynafont_t df)
-{
- ihash_free (df->charmap);
- free (df->charmap_data);
- free (df->vga_font);
- free (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)
-{
- struct mapped_character *chr = ihash_find (df->charmap, (int) wide_chr);
-
- if (chr)
- {
- if (!chr->refs++)
- df->vga_font_free_indices--;
- return (chr - df->charmap_data) / sizeof (struct mapped_character);
- }
-
- /* The character is not currently mapped. Look for an empty
- slot and add it. */
- if (df->vga_font_free_indices)
- {
- int pos = (df->vga_font_last_free_index + 1) % df->size;
- struct bdf_glyph *glyph;
-
- glyph = bdf_find_glyph (df->font, (int) wide_chr, 0);
- if (!glyph)
- glyph = bdf_find_glyph (df->font, -1, (int) wide_chr);
- if (glyph)
- {
- while (pos != df->vga_font_last_free_index)
- {
- if (df->charmap_data[pos].refs == 0)
- {
- /* Ok, we found a new entry, use it. */
- df->vga_font_last_free_index = pos;
- chr = &df->charmap_data[pos];
- chr->refs = 1;
- memcpy (df->vga_font[pos], glyph->bitmap, VGA_FONT_HEIGHT);
- /* XXX This will have to be updated when fonts are
- cached. */
- if (active_dynafont == df)
- vga_write_font_buffer (0, pos, (char *) glyph->bitmap,
- VGA_FONT_HEIGHT);
- /* Update the hash table. */
- if (chr->locp)
- ihash_locp_remove (df->charmap, chr->locp);
- ihash_add (df->charmap, (int) wide_chr, chr, &chr->locp);
- return pos;
- }
- pos = (pos + 1) % df->size;
- }
- /* Should never be reached. */
- assert (!"No free vga font index.");
- }
- }
-
- df->charmap_data[FONT_INDEX_UNKNOWN].refs++;
- return FONT_INDEX_UNKNOWN;
-}
-
-
-/* Release a reference to the glyph VGA_FONT_INDEX in dynafont DF. */
-void
-dynafont_release (dynafont_t df, int vga_font_index)
-{
- if (! --df->charmap_data[vga_font_index].refs)
- df->vga_font_free_indices++;
-}
-
-
-/* Load the VGA font to the card and make it active. */
-void
-dynafont_activate (dynafont_t df)
-{
- /* XXX Replace this with some caching method. We have eight font
- slots available. */
- vga_write_font_buffer (0, 0, (char *) df->vga_font,
- df->size * VGA_FONT_HEIGHT);
- vga_select_font_buffer (0, (df->size == 512) ? 1 : 0);
- active_dynafont = 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)
-{
- int i;
-
- df->font = font;
- for (i = 0; i < df->size; i++)
- {
- /* If we don't derive the unknown or space glyph from the font,
- we don't update it. */
-#ifndef ENCODING_UNKNOWN
- if (i == FONT_INDEX_UNKNOWN)
- continue;
-#endif
-#ifndef ENCODING_SPACE
- if (i == FONT_INDEX_SPACE)
- continue;
-#endif
- if (! df->charmap_data[i].refs)
- {
- /* The glyph is not used. If it is mapped, we need to
- remove the mapping to invalidate the glyph. */
- if (df->charmap_data[i].locp)
- ihash_locp_remove (df->charmap, df->charmap_data[i].locp);
- }
-
- else
- {
- /* The glyph is mapped and in use. We will not destroy the
- mapping, but just override the glyph in the VGA font.
- This way the user can recover from loading a bad font by
- going back to a better one. */
- struct bdf_glyph *glyph;
- glyph = bdf_find_glyph (df->font,
- (int) df->charmap_data[i].character, 0);
- if (!glyph)
- glyph = bdf_find_glyph (df->font, -1,
- (int) df->charmap_data[i].character);
- if (!glyph)
- {
-#ifdef ENCODING_UNKNOWN
- /* The new font doesn't have a representation for the
- unknown glyph at the desired place, so keep the old
- one. XXX Should load the built-in one here. */
- if (i == FONT_INDEX_UNKNOWN)
- continue;
-#endif
-#ifdef ENCODING_SPACE
- /* The new font doesn't have a representation for the
- blank glyph at the desired place, so keep the old
- one. XXX Should load the built-in one here. */
- if (i == FONT_INDEX_SPACE)
- continue;
-#endif
- memcpy (df->vga_font[i], df->vga_font[FONT_INDEX_UNKNOWN],
- 32);
- }
- else
- /* XXX Take font size and glyph size into account. */
- memcpy (df->vga_font[i], glyph->bitmap, 32);
- }
- }
-
- /* XXX This will have to be changed when we use font caching. */
- if (active_dynafont == df)
- vga_write_font_buffer (0, 0, (char *) df->vga_font,
- df->size * VGA_FONT_HEIGHT);
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-16 16:55:28 +0000