[pango/non-breaking-attrs: 3/6] Add pango_item_apply_attrs

[Matthias Clasen <matthiasc src gnome org>]

commit 4315d4f49b054e8d322fe87845bc3843f7523835
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu Jul 11 11:31:43 2019 -0400

    Add pango_item_apply_attrs
    
    This adds attrs that are overlapping the range
    of the item to the extra_attrs in the analysis.

 pango/pango-item.c | 45 +++++++++++++++++++++++++++++++++++++++++++++
 pango/pango-item.h |  4 ++++
 2 files changed, 49 insertions(+)
---
diff --git a/pango/pango-item.c b/pango/pango-item.c
index 8c368874..787fb65e 100644
--- a/pango/pango-item.c
+++ b/pango/pango-item.c
@@ -153,3 +153,48 @@ pango_item_split (PangoItem  *orig,
 
   return new_item;
 }
+
+static int
+compare_attr (gconstpointer p1, gconstpointer p2)
+{
+  if (pango_attribute_equal ((PangoAttribute *)p1, (PangoAttribute *)p2))
+    return 0;
+
+  return 1;
+}
+
+void
+pango_item_apply_attrs (PangoItem         *item,
+                        PangoAttrIterator *iter)
+{
+  int start, end;
+  GSList *attrs = NULL;
+
+  do
+    {
+      pango_attr_iterator_range (iter, &start, &end);
+
+      if (start >= item->offset + item->length)
+        break;
+
+      if (end >= item->offset)
+        {
+          GSList *list, *l;
+
+          list = pango_attr_iterator_get_attrs (iter);
+          for (l = list; l; l = l->next)
+            {
+              if (!g_slist_find_custom (attrs, l->data, compare_attr))
+
+              attrs = g_slist_prepend (attrs, pango_attribute_copy (l->data));
+            }
+          g_slist_free_full (list, (GDestroyNotify)pango_attribute_destroy);
+        }
+
+      if (end >= item->offset + item->length)
+        break;
+    }
+  while (pango_attr_iterator_next (iter));
+
+  item->analysis.extra_attrs = g_slist_concat (item->analysis.extra_attrs, attrs);
+}
diff --git a/pango/pango-item.h b/pango/pango-item.h
index cb6a7ed3..2d7e58a1 100644
--- a/pango/pango-item.h
+++ b/pango/pango-item.h
@@ -23,6 +23,7 @@
 #define __PANGO_ITEM_H__
 
 #include <pango/pango-types.h>
+#include <pango/pango-attributes.h>
 
 G_BEGIN_DECLS
 
@@ -112,6 +113,9 @@ PANGO_AVAILABLE_IN_ALL
 PangoItem *pango_item_split (PangoItem  *orig,
                             int         split_index,
                             int         split_offset);
+PANGO_AVAILABLE_IN_1_44
+void       pango_item_apply_attrs (PangoItem         *item,
+                                   PangoAttrIterator *iter);
 
 G_END_DECLS