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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 16:29:51 +0000
commit6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e (patch)
tree32451fa3cdd9321fb2591fada9891b2cb70a9cd1 /grub-core/gfxmenu/font.c
parentInitial commit. (diff)
downloadgrub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.tar.xz
grub2-6e7a315eb67cb6c113cf37e1d66c4f11a51a2b3e.zip
Adding upstream version 2.06.upstream/2.06upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'grub-core/gfxmenu/font.c')
-rw-r--r--grub-core/gfxmenu/font.c116
1 files changed, 116 insertions, 0 deletions
diff --git a/grub-core/gfxmenu/font.c b/grub-core/gfxmenu/font.c
new file mode 100644
index 0000000..756c24f
--- /dev/null
+++ b/grub-core/gfxmenu/font.c
@@ -0,0 +1,116 @@
+/* font.c - Font API and font file loader. */
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2003,2005,2006,2007,2008,2009,2010 Free Software Foundation, Inc.
+ *
+ * GRUB 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 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <grub/bufio.h>
+#include <grub/dl.h>
+#include <grub/file.h>
+#include <grub/font.h>
+#include <grub/misc.h>
+#include <grub/mm.h>
+#include <grub/types.h>
+#include <grub/video.h>
+#include <grub/bitmap.h>
+#include <grub/charset.h>
+#include <grub/unicode.h>
+#include <grub/fontformat.h>
+#include <grub/gfxmenu_view.h>
+
+/* Draw a UTF-8 string of text on the current video render target.
+ The x coordinate specifies the starting x position for the first character,
+ while the y coordinate specifies the baseline position.
+ If the string contains a character that FONT does not contain, then
+ a glyph from another loaded font may be used instead. */
+grub_err_t
+grub_font_draw_string (const char *str, grub_font_t font,
+ grub_video_color_t color,
+ int left_x, int baseline_y)
+{
+ int x;
+ grub_uint32_t *logical;
+ grub_ssize_t logical_len, visual_len;
+ struct grub_unicode_glyph *visual, *ptr;
+ grub_err_t err;
+
+ logical_len = grub_utf8_to_ucs4_alloc (str, &logical, 0);
+ if (logical_len < 0)
+ return grub_errno;
+
+ visual_len = grub_bidi_logical_to_visual (logical, logical_len, &visual,
+ 0, 0, 0, 0, 0, 0, 0);
+ grub_free (logical);
+ if (visual_len < 0)
+ return grub_errno;
+
+ err = GRUB_ERR_NONE;
+ for (ptr = visual, x = left_x; ptr < visual + visual_len; ptr++)
+ {
+ struct grub_font_glyph *glyph;
+ glyph = grub_font_construct_glyph (font, ptr);
+ if (!glyph)
+ {
+ err = grub_errno;
+ goto out;
+ }
+ err = grub_font_draw_glyph (glyph, color, x, baseline_y);
+ if (err)
+ goto out;
+ x += glyph->device_width;
+ }
+
+out:
+ for (ptr = visual; ptr < visual + visual_len; ptr++)
+ grub_unicode_destroy_glyph (ptr);
+ grub_free (visual);
+
+ return err;
+}
+
+/* Get the width in pixels of the specified UTF-8 string, when rendered in
+ in the specified font (but falling back on other fonts for glyphs that
+ are missing). */
+int
+grub_font_get_string_width (grub_font_t font, const char *str)
+{
+ int width = 0;
+ grub_uint32_t *ptr;
+ grub_ssize_t logical_len;
+ grub_uint32_t *logical;
+
+ logical_len = grub_utf8_to_ucs4_alloc (str, &logical, 0);
+ if (logical_len < 0)
+ {
+ grub_errno = GRUB_ERR_NONE;
+ return 0;
+ }
+
+ for (ptr = logical; ptr < logical + logical_len;)
+ {
+ struct grub_unicode_glyph glyph;
+
+ ptr += grub_unicode_aglomerate_comb (ptr,
+ logical_len - (ptr - logical),
+ &glyph);
+ width += grub_font_get_constructed_device_width (font, &glyph);
+
+ grub_unicode_destroy_glyph (&glyph);
+ }
+ grub_free (logical);
+
+ return width;
+}