From 016a2707f573efe113f89ced1870912de19a16a1 Mon Sep 17 00:00:00 2001
From: Campbell Barton <ideasman42@gmail.com>
Date: Fri, 2 Jul 2021 12:51:44 +1000
Subject: Cleanup: refactor edit-mesh copy functions into functions

---
 source/blender/editors/mesh/editmesh_utils.c | 85 +++++++++++++++++-----------
 1 file changed, 51 insertions(+), 34 deletions(-)

(limited to 'source/blender')

diff --git a/source/blender/editors/mesh/editmesh_utils.c b/source/blender/editors/mesh/editmesh_utils.c
index 141b69f0465..4beed6935d4 100644
--- a/source/blender/editors/mesh/editmesh_utils.c
+++ b/source/blender/editors/mesh/editmesh_utils.c
@@ -115,6 +115,45 @@ void EDBM_redo_state_free(BMBackup *backup, BMEditMesh *em, int recalctess)
 
 /** \} */
 
+/* -------------------------------------------------------------------- */
+/** \name Edit-Mesh Copy API (Internal)
+ * \{ */
+
+static void edbm_op_emcopy_incref_and_ensure(BMEditMesh *em, const BMOperator *UNUSED(bmop))
+{
+  if (em->emcopy == NULL) {
+    em->emcopy = BKE_editmesh_copy(em);
+  }
+  em->emcopyusers++;
+}
+
+static void edbm_op_emcopy_decref(BMEditMesh *em, const BMOperator *UNUSED(bmop))
+{
+  em->emcopyusers--;
+  if (em->emcopyusers < 0) {
+    printf("warning: em->emcopyusers was less than zero.\n");
+  }
+  if (em->emcopyusers <= 0) {
+    BKE_editmesh_free(em->emcopy);
+    MEM_freeN(em->emcopy);
+    em->emcopy = NULL;
+  }
+}
+
+static void edbm_op_emcopy_restore_and_clear(BMEditMesh *em, const BMOperator *UNUSED(bmop))
+{
+  BLI_assert(em->emcopy != NULL);
+  BMEditMesh *emcopy = em->emcopy;
+  EDBM_mesh_free(em);
+  *em = *emcopy;
+
+  MEM_freeN(emcopy);
+  em->emcopyusers = 0;
+  em->emcopy = NULL;
+}
+
+/** \} */
+
 /* -------------------------------------------------------------------- */
 /** \name BMesh Operator (BMO) API Wrapper
  * \{ */
@@ -132,17 +171,18 @@ bool EDBM_op_init(BMEditMesh *em, BMOperator *bmop, wmOperator *op, const char *
     return false;
   }
 
-  if (!em->emcopy) {
-    em->emcopy = BKE_editmesh_copy(em);
-  }
-  em->emcopyusers++;
+  edbm_op_emcopy_incref_and_ensure(em, bmop);
 
   va_end(list);
 
   return true;
 }
 
-/* returns 0 on error, 1 on success.  executes and finishes a bmesh operator */
+/**
+ * The return value:
+ * - False on error (the mesh must not be changed).
+ * - True on success, executes and finishes a #BMesh operator.
+ */
 bool EDBM_op_finish(BMEditMesh *em, BMOperator *bmop, wmOperator *op, const bool do_report)
 {
   const char *errmsg;
@@ -150,18 +190,13 @@ bool EDBM_op_finish(BMEditMesh *em, BMOperator *bmop, wmOperator *op, const bool
   BMO_op_finish(em->bm, bmop);
 
   if (BMO_error_get(em->bm, &errmsg, NULL)) {
-    BMEditMesh *emcopy = em->emcopy;
+    BLI_assert(em->emcopy != NULL);
 
     if (do_report) {
       BKE_report(op->reports, RPT_ERROR, errmsg);
     }
 
-    EDBM_mesh_free(em);
-    *em = *emcopy;
-
-    MEM_freeN(emcopy);
-    em->emcopyusers = 0;
-    em->emcopy = NULL;
+    edbm_op_emcopy_restore_and_clear(em, bmop);
 
     /**
      * Note, we could pass in the mesh, however this is an exceptional case, allow a slow lookup.
@@ -189,16 +224,7 @@ bool EDBM_op_finish(BMEditMesh *em, BMOperator *bmop, wmOperator *op, const bool
     return false;
   }
 
-  em->emcopyusers--;
-  if (em->emcopyusers < 0) {
-    printf("warning: em->emcopyusers was less than zero.\n");
-  }
-
-  if (em->emcopyusers <= 0) {
-    BKE_editmesh_free(em->emcopy);
-    MEM_freeN(em->emcopy);
-    em->emcopy = NULL;
-  }
+  edbm_op_emcopy_decref(em, bmop);
 
   return true;
 }
@@ -217,10 +243,7 @@ bool EDBM_op_callf(BMEditMesh *em, wmOperator *op, const char *fmt, ...)
     return false;
   }
 
-  if (!em->emcopy) {
-    em->emcopy = BKE_editmesh_copy(em);
-  }
-  em->emcopyusers++;
+  edbm_op_emcopy_incref_and_ensure(em, &bmop);
 
   BMO_op_exec(bm, &bmop);
 
@@ -249,10 +272,7 @@ bool EDBM_op_call_and_selectf(BMEditMesh *em,
     return false;
   }
 
-  if (!em->emcopy) {
-    em->emcopy = BKE_editmesh_copy(em);
-  }
-  em->emcopyusers++;
+  edbm_op_emcopy_incref_and_ensure(em, &bmop);
 
   BMO_op_exec(bm, &bmop);
 
@@ -284,10 +304,7 @@ bool EDBM_op_call_silentf(BMEditMesh *em, const char *fmt, ...)
     return false;
   }
 
-  if (!em->emcopy) {
-    em->emcopy = BKE_editmesh_copy(em);
-  }
-  em->emcopyusers++;
+  edbm_op_emcopy_incref_and_ensure(em, &bmop);
 
   BMO_op_exec(bm, &bmop);
 
-- 
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