From ee2204469ebfe3a3e9c76e856a7e0c8aab1dd946 Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Sun, 18 Dec 2022 13:50:34 -0700
Subject: [PATCH] [paint] Add get_empty / [sg]et_user_data

---
 src/hb-cplusplus.hh |  2 +-
 src/hb-draw.cc      |  1 -
 src/hb-paint.cc     | 58 +++++++++++++++++++++++++++++++++++++++++++++
 src/hb-paint.h      | 15 ++++++++++++
 4 files changed, 74 insertions(+), 2 deletions(-)

diff --git a/src/hb-cplusplus.hh b/src/hb-cplusplus.hh
index f9e44aafd..531ef1b7c 100644
--- a/src/hb-cplusplus.hh
+++ b/src/hb-cplusplus.hh
@@ -161,7 +161,7 @@ HB_DEFINE_VTABLE (set);
 HB_DEFINE_VTABLE (shape_plan);
 HB_DEFINE_VTABLE (unicode_funcs);
 HB_DEFINE_VTABLE (draw_funcs);
-//HB_DEFINE_VTABLE (paint_funcs);
+HB_DEFINE_VTABLE (paint_funcs);
 
 #undef HB_DEFINE_VTABLE
 
diff --git a/src/hb-draw.cc b/src/hb-draw.cc
index dde7e39cc..c0d12992a 100644
--- a/src/hb-draw.cc
+++ b/src/hb-draw.cc
@@ -213,7 +213,6 @@ hb_draw_funcs_get_empty ()
   return const_cast<hb_draw_funcs_t *> (&Null (hb_draw_funcs_t));
 }
 
-
 /**
  * hb_draw_funcs_reference: (skip)
  * @dfuncs: draw functions
diff --git a/src/hb-paint.cc b/src/hb-paint.cc
index 0872479f4..18f52f2bf 100644
--- a/src/hb-paint.cc
+++ b/src/hb-paint.cc
@@ -225,6 +225,21 @@ DEFINE_NULL_INSTANCE (hb_paint_funcs_t) =
   }
 };
 
+/**
+ * hb_paint_funcs_get_empty:
+ *
+ * Fetches the singleton empty paint-functions structure.
+ *
+ * Return value: (transfer full): The empty paint-functions structure
+ *
+ * Since: REPLACEME
+ **/
+hb_paint_funcs_t *
+hb_paint_funcs_get_empty ()
+{
+  return const_cast<hb_paint_funcs_t *> (&Null (hb_paint_funcs_t));
+}
+
 /**
  * hb_paint_funcs_reference: (skip)
  * @funcs: The paint-functions structure
@@ -270,6 +285,49 @@ hb_paint_funcs_destroy (hb_paint_funcs_t *funcs)
   hb_free (funcs);
 }
 
+/**
+ * hb_paint_funcs_set_user_data: (skip)
+ * @pfuncs: The paint-functions structure
+ * @key: The user-data key
+ * @data: A pointer to the user data
+ * @destroy: (nullable): A callback to call when @data is not needed anymore
+ * @replace: Whether to replace an existing data with the same key
+ *
+ * Attaches a user-data key/data pair to the specified paint-functions structure. 
+ *
+ * Return value: `true` if success, `false` otherwise
+ *
+ * Since: REPLACEME
+ **/
+hb_bool_t
+hb_paint_funcs_set_user_data (hb_paint_funcs_t *pfuncs,
+			     hb_user_data_key_t *key,
+			     void *              data,
+			     hb_destroy_func_t   destroy,
+			     hb_bool_t           replace)
+{
+  return hb_object_set_user_data (pfuncs, key, data, destroy, replace);
+}
+
+/**
+ * hb_paint_funcs_get_user_data: (skip)
+ * @pfuncs: The paint-functions structure
+ * @key: The user-data key to query
+ *
+ * Fetches the user-data associated with the specified key,
+ * attached to the specified paint-functions structure.
+ *
+ * Return value: (transfer none): A pointer to the user data
+ *
+ * Since: REPLACEME
+ **/
+void *
+hb_paint_funcs_get_user_data (const hb_paint_funcs_t *pfuncs,
+			     hb_user_data_key_t       *key)
+{
+  return hb_object_get_user_data (pfuncs, key);
+}
+
 /**
  * hb_paint_funcs_make_immutable:
  * @funcs: The paint-functions structure
diff --git a/src/hb-paint.h b/src/hb-paint.h
index 06e4095fc..6793a6349 100644
--- a/src/hb-paint.h
+++ b/src/hb-paint.h
@@ -65,12 +65,27 @@ typedef struct hb_paint_funcs_t hb_paint_funcs_t;
 HB_EXTERN hb_paint_funcs_t *
 hb_paint_funcs_create (void);
 
+HB_EXTERN hb_paint_funcs_t *
+hb_paint_funcs_get_empty (void);
+
 HB_EXTERN hb_paint_funcs_t *
 hb_paint_funcs_reference (hb_paint_funcs_t *funcs);
 
 HB_EXTERN void
 hb_paint_funcs_destroy (hb_paint_funcs_t *funcs);
 
+HB_EXTERN hb_bool_t
+hb_paint_funcs_set_user_data (hb_paint_funcs_t *funcs,
+			      hb_user_data_key_t *key,
+			      void *              data,
+			      hb_destroy_func_t   destroy,
+			      hb_bool_t           replace);
+
+
+HB_EXTERN void *
+hb_paint_funcs_get_user_data (const hb_paint_funcs_t *funcs,
+			      hb_user_data_key_t       *key);
+
 HB_EXTERN void
 hb_paint_funcs_make_immutable (hb_paint_funcs_t *funcs);