Cleanup: some moar DM kicking, in armature edit code.

source/blender/blenkernel/BKE_mesh_iterators.h

@@ -62,4 +62,6 @@ void BKE_mesh_foreach_mapped_face_center(
         void *userData,
         MeshForeachFlag flag);
 
+void BKE_mesh_foreach_mapped_vert_coords_get(struct Mesh *me_eval, float (*r_cos)[3], const int totcos);
+
 #endif  /* __BKE_MESH_ITERATORS_H__ */

source/blender/blenkernel/intern/mesh_iterators.c

@@ -33,6 +33,10 @@
 #include "BKE_mesh.h"
 #include "BKE_mesh_iterators.h"
 
+#include "BLI_bitmap.h"
+#include "BLI_math.h"
+
+#include "MEM_guardedalloc.h"
 
 /* Copied from cdDM_foreachMappedVert */
 void BKE_mesh_foreach_mapped_vert(
@@ -152,3 +156,36 @@ void BKE_mesh_foreach_mapped_face_center(
 	}
 
 }
+
+
+/* Helpers based on above foreach loopers> */
+
+typedef struct MappedVCosData {
+	float (*vertexcos)[3];
+	BLI_bitmap *vertex_visit;
+} MappedVCosData;
+
+static void get_vertexcos__mapFunc(
+        void *user_data, int index, const float co[3],
+        const float UNUSED(no_f[3]), const short UNUSED(no_s[3]))
+{
+	MappedVCosData *mapped_vcos_data = (MappedVCosData *)user_data;
+
+	if (BLI_BITMAP_TEST(mapped_vcos_data->vertex_visit, index) == 0) {
+		/* We need coord from prototype vertex, not from copies,
+		 * we assume they stored in the beginning of vertex array stored in evaluated mesh
+		 * (mirror modifier for eg does this). */
+		copy_v3_v3(mapped_vcos_data->vertexcos[index], co);
+		BLI_BITMAP_ENABLE(mapped_vcos_data->vertex_visit, index);
+	}
+}
+
+void BKE_mesh_foreach_mapped_vert_coords_get(Mesh *me_eval, float (*r_cos)[3], const int totcos)
+{
+	MappedVCosData user_data;
+	memset(r_cos, 0, sizeof(*r_cos) * totcos);
+	user_data.vertexcos = r_cos;
+	user_data.vertex_visit = BLI_BITMAP_NEW(totcos, __func__);
+	BKE_mesh_foreach_mapped_vert(me_eval, get_vertexcos__mapFunc, &user_data, MESH_FOREACH_NOP);
+	MEM_freeN(user_data.vertex_visit);
+}

source/blender/editors/armature/armature_skinning.c

@@ -45,11 +45,12 @@
 #include "BKE_armature.h"
 #include "BKE_context.h"
 #include "BKE_deform.h"
+#include "BKE_mesh_iterators.h"
 #include "BKE_mesh_runtime.h"
+#include "BKE_modifier.h"
 #include "BKE_object_deform.h"
 #include "BKE_report.h"
 #include "BKE_subsurf.h"
-#include "BKE_modifier.h"
 
 #include "DEG_depsgraph.h"
 
@@ -259,7 +260,7 @@ static void add_verts_to_dgroups(
 	 * into account and vertex weights can be mirrored.
 	 *
 	 * The mesh vertex positions used are either the final deformed coords
-	 * from the derivedmesh in weightpaint mode, the final subsurf coords
+	 * from the evaluated mesh in weightpaint mode, the final subsurf coords
 	 * when parenting, or simply the original mesh coords.
 	 */
 
@@ -373,15 +374,11 @@ static void add_verts_to_dgroups(
 	verts = MEM_callocN(mesh->totvert * sizeof(*verts), "closestboneverts");
 
 	if (wpmode) {
-		/* if in weight paint mode, use final verts from derivedmesh */
-		DerivedMesh *dm = mesh_get_derived_final(depsgraph, scene, ob, CD_MASK_BAREMESH);
+		/* if in weight paint mode, use final verts from evaluated mesh */
+		Mesh *me_eval = mesh_get_eval_final(depsgraph, scene, ob, CD_MASK_BAREMESH);
 
-		if (dm->foreachMappedVert) {
-			mesh_get_mapped_verts_coords(dm, verts, mesh->totvert);
-			vertsfilled = 1;
-		}
-
-		dm->release(dm);
+		BKE_mesh_foreach_mapped_vert_coords_get(me_eval, verts, mesh->totvert);
+		vertsfilled = 1;
 	}
 	else if (modifiers_findByType(ob, eModifierType_Subsurf)) {
 		/* is subsurf on? Lets use the verts on the limit surface then.

source/blender/editors/armature/meshlaplacian.c

@@ -29,6 +29,7 @@
 
 #include "DNA_object_types.h"
 #include "DNA_mesh_types.h"
+#include "DNA_meshdata_types.h"
 #include "DNA_scene_types.h"
 
 #include "BLI_math.h"
@@ -39,10 +40,10 @@
 
 #include "BLT_translation.h"
 
-#include "BKE_DerivedMesh.h"
-#include "BKE_modifier.h"
+#include "BKE_bvhutils.h"
 #include "BKE_mesh.h"
 #include "BKE_mesh_runtime.h"
+#include "BKE_modifier.h"
 
 #include "ED_mesh.h"
 #include "ED_armature.h"