1 files changed, 59 insertions, 0 deletions
diff --git a/source/blender/depsgraph/intern/eval/deg_eval_runtime_backup_gpencil.cc b/source/blender/depsgraph/intern/eval/deg_eval_runtime_backup_gpencil.cc
new file mode 100644
index 00000000000..63d1eb9f711
--- /dev/null
+++ b/source/blender/depsgraph/intern/eval/deg_eval_runtime_backup_gpencil.cc
@@ -0,0 +1,59 @@
+/*
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * The Original Code is Copyright (C) 2022 Blender Foundation.
+ * All rights reserved.
+ */
+
+/** \file
+ * \ingroup depsgraph
+ */
+
+#include "intern/eval/deg_eval_runtime_backup_gpencil.h"
+#include "intern/depsgraph.h"
+
+#include "BKE_gpencil.h"
+#include "BKE_gpencil_update_cache.h"
+
+#include "DNA_gpencil_types.h"
+
+namespace blender::deg {
+
+GPencilBackup::GPencilBackup(const Depsgraph *depsgraph) : depsgraph(depsgraph)
+{
+}
+
+void GPencilBackup::init_from_gpencil(bGPdata *UNUSED(gpd))
+{
+}
+
+void GPencilBackup::restore_to_gpencil(bGPdata *gpd)
+{
+  bGPdata *gpd_orig = reinterpret_cast<bGPdata *>(gpd->id.orig_id);
+
+  /* We check for the active depsgraph here to avoid freeing the cache on the original object
+   * multiple times. This free is only needed for the case where we tagged a full update in the
+   * update cache and did not do an update-on-write. */
+  if (depsgraph->is_active) {
+    BKE_gpencil_free_update_cache(gpd_orig);
+  }
+  /* Doing a copy-on-write copies the update cache pointer. Make sure to reset it
+   * to NULL as we should never use the update cache from eval data. */
+  gpd->runtime.update_cache = NULL;
+  /* Make sure to update the original runtime pointers in the eval data. */
+  BKE_gpencil_data_update_orig_pointers(gpd_orig, gpd);
+}
+
+}  // namespace blender::deg