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;
+}