From 3e905e396bcd745bda88e751998a76556c5cb8c6 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Thu, 8 Oct 2015 12:51:02 -0400
Subject: [PATCH] Add hb_font_set_parent()

No reason to not have it.  Makes life easier later.
We (hb-ft, hb-ot-font, etc) can use this API to inject new
parent into a font...
---
 src/hb-font.cc       | 26 ++++++++++++++++++++++++++
 src/hb-font.h        |  4 ++++
 test/api/test-font.c | 12 ++++++++++++
 3 files changed, 42 insertions(+)

diff --git a/src/hb-font.cc b/src/hb-font.cc
index 058d7ec..6a69cae 100644
--- a/src/hb-font.cc
+++ b/src/hb-font.cc
@@ -1059,6 +1059,32 @@ hb_font_is_immutable (hb_font_t *font)
 }
 
 /**
+ * hb_font_set_parent:
+ * @font: a font.
+ * @parent: new parent.
+ *
+ * Sets parent font of @font.
+ *
+ * Since: 1.0.5
+ **/
+void
+hb_font_set_parent (hb_font_t *font,
+		    hb_font_t *parent)
+{
+  if (font->immutable)
+    return;
+
+  if (!parent)
+    parent = hb_font_get_empty ();
+
+  hb_font_t *old = font->parent;
+
+  font->parent = hb_font_reference (parent);
+
+  hb_font_destroy (old);
+}
+
+/**
  * hb_font_get_parent:
  * @font: a font.
  *
diff --git a/src/hb-font.h b/src/hb-font.h
index ffb2010..fb4a0ea 100644
--- a/src/hb-font.h
+++ b/src/hb-font.h
@@ -459,6 +459,10 @@ hb_font_make_immutable (hb_font_t *font);
 hb_bool_t
 hb_font_is_immutable (hb_font_t *font);
 
+void
+hb_font_set_parent (hb_font_t *font,
+		    hb_font_t *parent);
+
 hb_font_t *
 hb_font_get_parent (hb_font_t *font);
 
diff --git a/test/api/test-font.c b/test/api/test-font.c
index 5afc885..ef5b08f 100644
--- a/test/api/test-font.c
+++ b/test/api/test-font.c
@@ -387,6 +387,18 @@ test_font_properties (void)
 
   g_assert (hb_font_get_face (font) == face);
   g_assert (hb_font_get_parent (font) == NULL);
+  subfont = hb_font_create_sub_font (font);
+  g_assert (hb_font_get_parent (subfont) == font);
+  hb_font_set_parent(subfont, NULL);
+  g_assert (hb_font_get_parent (subfont) == hb_font_get_empty());
+  hb_font_set_parent(subfont, font);
+  g_assert (hb_font_get_parent (subfont) == font);
+  hb_font_set_parent(subfont, NULL);
+  hb_font_make_immutable (subfont);
+  g_assert (hb_font_get_parent (subfont) == hb_font_get_empty());
+  hb_font_set_parent(subfont, font);
+  g_assert (hb_font_get_parent (subfont) == hb_font_get_empty());
+  hb_font_destroy (subfont);
 
 
   /* Check scale */
-- 
2.7.4