[gtk/better-font-rendering-demo: 1/4] gtk-demo: Improve the font rendering demo

[Matthias Clasen <matthiasc src gnome org>]

commit 4ac527de74f54f3a3eaafbd4e4a598bc879d9f46
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Sep 4 20:28:59 2021 -0400

    gtk-demo: Improve the font rendering demo
    
    Allow changing the character shown in the grid.

 demos/gtk-demo/fontrendering.c | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/demos/gtk-demo/fontrendering.c b/demos/gtk-demo/fontrendering.c
index e95a78f7e7..b032fa335d 100644
--- a/demos/gtk-demo/fontrendering.c
+++ b/demos/gtk-demo/fontrendering.c
@@ -167,10 +167,20 @@ update_image (void)
       PangoLayoutRun *run;
       PangoGlyphInfo *g;
       int i, j;
+      char buf[24] = { 0, };
+      int len;
+
+      if (*text == '\0')
+        text = " ";
+
+      len = g_utf8_next_char (text) - text;
+
+      for (i = 0; i < 4; i++)
+        memcpy (buf + i * len, text, len);
 
       layout = pango_layout_new (context);
       pango_layout_set_font_description (layout, desc);
-      pango_layout_set_text (layout, "aaaa", -1);
+      pango_layout_set_text (layout, buf, -1);
       pango_layout_get_extents (layout, &ink, &logical);
       pango_extents_to_pixels (&logical, NULL);
 
@@ -212,7 +222,6 @@ update_image (void)
       cairo_surface_destroy (surface);
     }
 
-
   gtk_picture_set_pixbuf (GTK_PICTURE (image), pixbuf2);
 
   g_object_unref (pixbuf2);