Add accumulated recalc flags to IDs.

Those accumulated flags get cleared every time an undo step is written
to memfile.

Preliminary work for undo-speedup.

Part of T60695/D6580.

1 files changed, 8 insertions, 0 deletions

diff --git a/source/blender/makesdna/DNA_ID.h b/source/blender/makesdna/DNA_ID.h
index 40916cbdc61..f2923c7f144 100644
--- a/source/blender/makesdna/DNA_ID.h
+++ b/source/blender/makesdna/DNA_ID.h
@@ -245,6 +245,12 @@ typedef struct ID {
   int us;
   int icon_id;
   int recalc;
+  /**
+   * Used by undo code. Value of recalc is stored there when reading an ID from memfile, and not
+   * touched by anything, which means it can be used as 'reference' recalc value for the next undo
+   * step, when going backward (i.e. actual undo, redo can just use recalc value directly).
+   */
+  int recalc_undo_accumulated;
 
   /**
    * A session-wide unique identifier for a given ID, that remain the same across potential
@@ -252,6 +258,8 @@ typedef struct ID {
    */
   unsigned int session_uuid;
 
+  char _pad[4];
+
   IDProperty *properties;
 
   /** Reference linked ID which this one overrides. */