LibOverride: Do not write Corrective Smooth modifier binding data.

Skip writing binding data and similar for override modifiers already
present in reference linked data, as this can use a lot of space, and
is fully useless data typically since we already skip writing Mesh
geometry data itself.

Ref. T97967.

1 files changed, 16 insertions, 5 deletions

diff --git a/source/blender/modifiers/intern/MOD_correctivesmooth.c b/source/blender/modifiers/intern/MOD_correctivesmooth.c
index e8a07f75b0f..70ab6559b65 100644
--- a/source/blender/modifiers/intern/MOD_correctivesmooth.c
+++ b/source/blender/modifiers/intern/MOD_correctivesmooth.c
@@ -798,14 +798,25 @@ static void panelRegister(ARegionType *region_type)
   modifier_panel_register(region_type, eModifierType_CorrectiveSmooth, panel_draw);
 }
 
-static void blendWrite(BlendWriter *writer, const ID *UNUSED(id_owner), const ModifierData *md)
+static void blendWrite(BlendWriter *writer, const ID *id_owner, const ModifierData *md)
 {
-  const CorrectiveSmoothModifierData *csmd = (const CorrectiveSmoothModifierData *)md;
+  CorrectiveSmoothModifierData csmd = *(const CorrectiveSmoothModifierData *)md;
+
+  if (ID_IS_OVERRIDE_LIBRARY(id_owner)) {
+    BLI_assert(!ID_IS_LINKED(id_owner));
+    const bool is_local = (md->flag & eModifierFlag_OverrideLibrary_Local) != 0;
+    if (!is_local) {
+      /* Modifier comming from linked data cannot be bound from an override, so we can remove all
+       * binding data, can save a sgnificant amout of memory. */
+      csmd.bind_coords_num = 0;
+      csmd.bind_coords = NULL;
+    }
+  }
 
-  BLO_write_struct(writer, CorrectiveSmoothModifierData, csmd);
+  BLO_write_struct_at_address(writer, CorrectiveSmoothModifierData, md, &csmd);
 
-  if (csmd->bind_coords) {
-    BLO_write_float3_array(writer, csmd->bind_coords_num, (float *)csmd->bind_coords);
+  if (csmd.bind_coords != NULL) {
+    BLO_write_float3_array(writer, csmd.bind_coords_num, (float *)csmd.bind_coords);
   }
 }