[pango] Avoid some overhead in itemize_state_process_run

[Matthias Clasen <matthiasc src gnome org>]

commit bbe896872189d6afb30f2fb6bec44e64eedc52ef
Author: Matthias Clasen <mclasen redhat com>
Date:   Sun Sep 13 11:28:33 2015 -0400

    Avoid some overhead in itemize_state_process_run
    
    Avoid determining the Unicode type repeatedly. Instead,
    just get the type once and filter out the classes we want.

 pango/pango-context.c |   19 +++++++++----------
 1 files changed, 9 insertions(+), 10 deletions(-)
---
diff --git a/pango/pango-context.c b/pango/pango-context.c
index dafc5dd..9d67b8e 100644
--- a/pango/pango-context.c
+++ b/pango/pango-context.c
@@ -1387,6 +1387,7 @@ itemize_state_process_run (ItemizeState *state)
       gboolean is_forced_break = (wc == '\t' || wc == LINE_SEPARATOR);
       PangoEngineShape *shape_engine;
       PangoFont *font;
+      GUnicodeType type;
 
       /* We don't want space characters to affect font selection; in general,
        * it's always wrong to select a font just to render a space.
@@ -1394,20 +1395,18 @@ itemize_state_process_run (ItemizeState *state)
        * characters if they don't, HarfBuzz will compatibility-decompose them
        * to ASCII space...
        * See bugs #355987 and #701652.
-       *
-       * The exception of PrivateUse and Unassigned characters is necessary
-       * to be able to render any of them. (for private or being encoded
-       * scripts, etc.) (Recent glib returns true in isprint for PrivateUse.)
        */
-      if (G_UNLIKELY (!g_unichar_isgraph (wc) &&
-                     g_unichar_type (wc) != G_UNICODE_PRIVATE_USE &&
-                     g_unichar_type (wc) != G_UNICODE_UNASSIGNED))
-       {
+      type = g_unichar_type (wc);
+      if (G_UNLIKELY (type == G_UNICODE_CONTROL ||
+                      type == G_UNICODE_FORMAT ||
+                      type == G_UNICODE_SURROGATE ||
+                      type == G_UNICODE_SPACE_SEPARATOR))
+        {
          shape_engine = NULL;
          font = NULL;
-       }
+        }
       else
-       {
+        {
          get_shaper_and_font (state, wc, &shape_engine, &font);
        }