vl-1003-gfx-cut-long-titles-using-ellipsis.patch

From 016b8ba052f77cb62fef4eeb4ca4272ee3053c2c Mon Sep 17 00:00:00 2001
From: Konstantin Vlasov <kvlasov@odin.com>
Date: Fri, 6 Nov 2015 17:35:47 +0300
Subject: [PATCH 3/3] Themes: Cut long boot menu titles using ellipsis.

---
 grub-core/gfxmenu/gui_list.c | 42 +++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 41 insertions(+), 1 deletion(-)

diff --git a/grub-core/gfxmenu/gui_list.c b/grub-core/gfxmenu/gui_list.c
index df334a6..2cb9bdb 100644
--- a/grub-core/gfxmenu/gui_list.c
+++ b/grub-core/gfxmenu/gui_list.c
@@ -314,6 +314,43 @@ draw_scrollbar (list_impl_t self,
   thumb->draw (thumb, thumbx, thumby);
 }
 
+/* Cuts several last characters replacing them with ellipsis, so that total
+   string length fit required width. */
+static void
+cut_string_to_width (grub_font_t font, char *str, int width)
+{
+  char *char_cut;
+  int len;
+
+  if ((str == NULL) || (*str == '\0'))
+    return;
+  if (grub_font_get_string_width(font, str) <= width)
+    return;
+
+  len = grub_strlen(str);
+  if (len < 4)
+    return;
+
+  /* Start with replacing the last 3 characters with ellispis.
+     In UTF-8 it takes 3 bytes, so we have no buffer overflow. */
+  char_cut = str + len - 3;
+  while (char_cut > str)
+    {
+      if ((*char_cut & 0xc0) == 0x80)
+        {
+          /* Skip non-first bytes from UTF-8 code sequences. */
+          --char_cut;
+          continue;
+        }
+      /* UTF-8 representation of U+2026 (Horizontal Ellipsis) is E2 80 A6. */
+      grub_strcpy(char_cut, "\xe2\x80\xa6");
+      if (grub_font_get_string_width(font, str) <= width)
+        return;
+      /* If still does not fit, cut one more character and repeat. */
+      --char_cut;
+    }
+}
+
 /* Draw the list of items.  */
 static void
 draw_menu (list_impl_t self, int num_shown_items)
@@ -436,11 +473,14 @@ draw_menu (list_impl_t self, int num_shown_items)
       sviewport.y = item_top + top_pad;
       sviewport.width = viewport_width;
       grub_gui_set_viewport (&sviewport, &svpsave);
-      grub_font_draw_string (item_title,
+      char* item_title_cut = grub_strdup(item_title);
+      cut_string_to_width(font, item_title_cut, cwidth - 8);
+      grub_font_draw_string (item_title_cut,
                              font,
                              color,
                              0,
                              text_top_offset);
+      grub_free(item_title_cut);
       grub_gui_restore_viewport (&svpsave);
 
       item_top += text_box_height + item_vspace;
-- 
1.8.3.1