From 4d0f7c3dcde22224b17e5c481fea11f99fe5b160 Mon Sep 17 00:00:00 2001
From: Bastien Montagne <bastien@blender.org>
Date: Fri, 10 Jun 2022 15:53:46 +0200
Subject: LibOverride: Add util to check if a given Override Property is
 animated.

Searches in available animdata for fcuve(s) with matching RNA path.
---
 source/blender/blenkernel/BKE_lib_override.h     | 13 ++++++++++
 source/blender/blenkernel/intern/lib_override.cc | 30 ++++++++++++++++++++++++
 2 files changed, 43 insertions(+)

(limited to 'source/blender/blenkernel')

diff --git a/source/blender/blenkernel/BKE_lib_override.h b/source/blender/blenkernel/BKE_lib_override.h
index 533bfa6b0bc..d19c2907be2 100644
--- a/source/blender/blenkernel/BKE_lib_override.h
+++ b/source/blender/blenkernel/BKE_lib_override.h
@@ -69,6 +69,19 @@ bool BKE_lib_override_library_is_user_edited(const struct ID *id);
  */
 bool BKE_lib_override_library_is_system_defined(const struct Main *bmain, const struct ID *id);
 
+/**
+ * Check if given Override Property for given ID is animated (through a F-Curve in an Action, or
+ * from a driver).
+ *
+ * \param override_rna_prop if not NULL, the RNA property matching the given path in the
+ * `override_prop`.
+ * \param rnaprop_index Array in the RNA property, 0 if unknown or irrelevant.
+ */
+bool BKE_lib_override_library_property_is_animated(const ID *id,
+                                                   const IDOverrideLibraryProperty *override_prop,
+                                                   const struct PropertyRNA *override_rna_prop,
+                                                   const int rnaprop_index);
+
 /**
  * Check if given ID is a leaf in its liboverride hierarchy (i.e. if it does not use any other
  * override ID).
diff --git a/source/blender/blenkernel/intern/lib_override.cc b/source/blender/blenkernel/intern/lib_override.cc
index 56d0308a033..22012662180 100644
--- a/source/blender/blenkernel/intern/lib_override.cc
+++ b/source/blender/blenkernel/intern/lib_override.cc
@@ -21,8 +21,10 @@
 #include "DEG_depsgraph.h"
 #include "DEG_depsgraph_build.h"
 
+#include "BKE_anim_data.h"
 #include "BKE_armature.h"
 #include "BKE_collection.h"
+#include "BKE_fcurve.h"
 #include "BKE_global.h"
 #include "BKE_idtype.h"
 #include "BKE_key.h"
@@ -321,6 +323,34 @@ bool BKE_lib_override_library_is_system_defined(const Main *bmain, const ID *id)
   return false;
 }
 
+bool BKE_lib_override_library_property_is_animated(const ID *id,
+                                                   const IDOverrideLibraryProperty *override_prop,
+                                                   const PropertyRNA *override_rna_prop,
+                                                   const int rnaprop_index)
+{
+  AnimData *anim_data = BKE_animdata_from_id(id);
+  if (anim_data != nullptr) {
+    struct FCurve *fcurve;
+    char *index_token_start = const_cast<char *>(
+        RNA_path_array_index_token_find(override_prop->rna_path, override_rna_prop));
+    if (index_token_start != nullptr) {
+      const char index_token_start_backup = *index_token_start;
+      *index_token_start = '\0';
+      fcurve = BKE_animadata_fcurve_find_by_rna_path(
+          anim_data, override_prop->rna_path, rnaprop_index, nullptr, nullptr);
+      *index_token_start = index_token_start_backup;
+    }
+    else {
+      fcurve = BKE_animadata_fcurve_find_by_rna_path(
+          anim_data, override_prop->rna_path, 0, nullptr, nullptr);
+    }
+    if (fcurve != nullptr) {
+      return true;
+    }
+  }
+  return false;
+}
+
 static int foreachid_is_hierarchy_leaf_fn(LibraryIDLinkCallbackData *cb_data)
 {
   ID *id_owner = cb_data->id_owner;
-- 
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