[pango] Allocate PangoScriptIter on stack.

Move the PangoScriptIter structure definition to a private header file,
so that we can embed the iterator within other structures or allocate
a local iterator on the stack. This eliminates the frequent short-lived
allocations associated with the iterator.

1 files changed, 56 insertions, 0 deletions

diff --git a/pango/pango-script-private.h b/pango/pango-script-private.h
new file mode 100644
index 00000000..b77209c6
--- /dev/null
+++ b/pango/pango-script-private.h
@@ -0,0 +1,56 @@
+/* Pango
+ * pango-script-private.h: Script tag handling, private definitions
+ *
+ * Copyright (C) 2002 Red Hat Software
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#ifndef __PANGO_SCRIPT_PRIVATE_H__
+#define __PANGO_SCRIPT_PRIVATE_H__
+
+#define PAREN_STACK_DEPTH 128
+
+typedef struct _ParenStackEntry ParenStackEntry;
+
+struct _ParenStackEntry
+{
+  int pair_index;
+  PangoScript script_code;
+};
+
+struct _PangoScriptIter
+{
+  const gchar *text_start;
+  const gchar *text_end;
+
+  const gchar *script_start;
+  const gchar *script_end;
+  PangoScript script_code;
+
+  ParenStackEntry paren_stack[PAREN_STACK_DEPTH];
+  int paren_sp;
+};
+
+PangoScriptIter *
+_pango_script_iter_init (PangoScriptIter *iter,
+	                 const char      *text,
+			 int              length);
+
+void
+_pango_script_iter_fini (PangoScriptIter *iter);
+
+#endif /* __PANGO_SCRIPT_PRIVATE_H__ */