Replace of (id->lib != NULL) check by meaningful macro.

Idea is to replace hard-to-track (id->lib != NULL) 'is linked datablock' check everywhere in Blender
by a macro doing the same thing. This will allow to easily spot those checks in future, and more importantly,
to easily change it (see work done in asset-engine branch).

Note: did not touch to readfile.c, since there most of the time 'id->lib' check actually concerns the pointer,
and not a check whether ID is linked or not. Will have a closer look at it later.

Reviewers: campbellbarton, brecht, sergey

Differential Revision: https://developer.blender.org/D2082

37 files changed, 110 insertions, 106 deletions

diff --git a/source/blender/editors/animation/anim_filter.c b/source/blender/editors/animation/anim_filter.c
index 910e195173c..0a1a4787eb0 100644
--- a/source/blender/editors/animation/anim_filter.c
+++ b/source/blender/editors/animation/anim_filter.c
@@ -1255,7 +1255,7 @@ static size_t animfilter_action(bAnimContext *ac, ListBase *anim_data, bDopeShee
 	/* don't include anything from this action if it is linked in from another file,
 	 * and we're getting stuff for editing...
 	 */
-	if ((filter_mode & ANIMFILTER_FOREDIT) && (act->id.lib))
+	if ((filter_mode & ANIMFILTER_FOREDIT) && ID_IS_LINKED_DATABLOCK(act))
 		return 0;
 		
 	/* do groups */
diff --git a/source/blender/editors/animation/keyframes_draw.c b/source/blender/editors/animation/keyframes_draw.c
index 6f1883cff55..011a25ca219 100644
--- a/source/blender/editors/animation/keyframes_draw.c
+++ b/source/blender/editors/animation/keyframes_draw.c
@@ -679,7 +679,7 @@ void draw_fcurve_channel(View2D *v2d, AnimData *adt, FCurve *fcu, float ypos)
 	
 	short locked = (fcu->flag & FCURVE_PROTECTED) ||
 	               ((fcu->grp) && (fcu->grp->flag & AGRP_PROTECTED)) ||
-	               ((adt && adt->action) && (adt->action->id.lib));
+	               ((adt && adt->action) && ID_IS_LINKED_DATABLOCK(adt->action));
 	
 	BLI_dlrbTree_init(&keys);
 	BLI_dlrbTree_init(&blocks);
@@ -700,7 +700,7 @@ void draw_agroup_channel(View2D *v2d, AnimData *adt, bActionGroup *agrp, float y
 	DLRBT_Tree keys, blocks;
 	
 	short locked = (agrp->flag & AGRP_PROTECTED) ||
-	               ((adt && adt->action) && (adt->action->id.lib));
+	               ((adt && adt->action) && ID_IS_LINKED_DATABLOCK(adt->action));
 	
 	BLI_dlrbTree_init(&keys);
 	BLI_dlrbTree_init(&blocks);
@@ -720,7 +720,7 @@ void draw_action_channel(View2D *v2d, AnimData *adt, bAction *act, float ypos)
 {
 	DLRBT_Tree keys, blocks;
 	
-	short locked = (act && act->id.lib != NULL);
+	short locked = (act && ID_IS_LINKED_DATABLOCK(act));
 	
 	BLI_dlrbTree_init(&keys);
 	BLI_dlrbTree_init(&blocks);
diff --git a/source/blender/editors/armature/pose_edit.c b/source/blender/editors/armature/pose_edit.c
index a929507929f..5015829f868 100644
--- a/source/blender/editors/armature/pose_edit.c
+++ b/source/blender/editors/armature/pose_edit.c
@@ -86,7 +86,7 @@ void ED_armature_enter_posemode(bContext *C, Base *base)
 	ReportList *reports = CTX_wm_reports(C);
 	Object *ob = base->object;
 	
-	if (ob->id.lib) {
+	if (ID_IS_LINKED_DATABLOCK(ob)) {
 		BKE_report(reports, RPT_WARNING, "Cannot pose libdata");
 		return;
 	}
diff --git a/source/blender/editors/armature/pose_lib.c b/source/blender/editors/armature/pose_lib.c
index dca9aa3e446..d9a3efa765c 100644
--- a/source/blender/editors/armature/pose_lib.c
+++ b/source/blender/editors/armature/pose_lib.c
@@ -183,7 +183,7 @@ static int has_poselib_pose_data_poll(bContext *C)
 static int has_poselib_pose_data_for_editing_poll(bContext *C)
 {
 	Object *ob = get_poselib_object(C);
-	return (ob && ob->poselib && !ob->poselib->id.lib);
+	return (ob && ob->poselib && !ID_IS_LINKED_DATABLOCK(ob->poselib));
 }
 
 /* ----------------------------------- */
@@ -385,7 +385,7 @@ static int poselib_add_poll(bContext *C)
 	if (ED_operator_posemode(C)) {
 		Object *ob = get_poselib_object(C);
 		if (ob) {
-			if ((ob->poselib == NULL) || (ob->poselib->id.lib == 0)) {
+			if ((ob->poselib == NULL) || !ID_IS_LINKED_DATABLOCK(ob->poselib)) {
 				return true;
 			}
 		}
diff --git a/source/blender/editors/interface/interface_eyedropper.c b/source/blender/editors/interface/interface_eyedropper.c
index 2cbc56b14d3..ac7b6428217 100644
--- a/source/blender/editors/interface/interface_eyedropper.c
+++ b/source/blender/editors/interface/interface_eyedropper.c
@@ -805,7 +805,7 @@ static int depthdropper_init(bContext *C, wmOperator *op)
 		RegionView3D *rv3d = CTX_wm_region_view3d(C);
 		if (rv3d && rv3d->persp == RV3D_CAMOB) {
 			View3D *v3d = CTX_wm_view3d(C);
-			if (v3d->camera && v3d->camera->data && (((ID *)v3d->camera->data)->lib == NULL)) {
+			if (v3d->camera && v3d->camera->data && !ID_IS_LINKED_DATABLOCK(v3d->camera->data)) {
 				RNA_id_pointer_create(v3d->camera->data, &ddr->ptr);
 				ddr->prop = RNA_struct_find_property(&ddr->ptr, "dof_distance");
 			}
diff --git a/source/blender/editors/interface/interface_ops.c b/source/blender/editors/interface/interface_ops.c
index ff29a6f8e33..01b10b7b032 100644
--- a/source/blender/editors/interface/interface_ops.c
+++ b/source/blender/editors/interface/interface_ops.c
@@ -416,7 +416,7 @@ bool UI_context_copy_to_selected_list(
 
 					if ((id_data == NULL) ||
 					    (id_data->tag & LIB_TAG_DOIT) == 0 ||
-					    (id_data->lib) ||
+					    ID_IS_LINKED_DATABLOCK(id_data->lib) ||
 					    (GS(id_data->name) != id_code))
 					{
 						BLI_remlink(&lb, link);
diff --git a/source/blender/editors/interface/interface_regions.c b/source/blender/editors/interface/interface_regions.c
index d4d3e1af1fd..575b32e81e8 100644
--- a/source/blender/editors/interface/interface_regions.c
+++ b/source/blender/editors/interface/interface_regions.c
@@ -454,7 +454,7 @@ static uiTooltipData *ui_tooltip_data_from_button(bContext *C, uiBut *but)
 
 		if (but->rnapoin.id.data) {
 			ID *id = but->rnapoin.id.data;
-			if (id->lib) {
+			if (ID_IS_LINKED_DATABLOCK(id)) {
 				BLI_snprintf(data->lines[data->totline], sizeof(data->lines[0]), TIP_("Library: %s"), id->lib->name);
 				data->format[data->totline].color_id = UI_TIP_LC_NORMAL;
 				data->totline++;
diff --git a/source/blender/editors/interface/interface_templates.c b/source/blender/editors/interface/interface_templates.c
index 7f276bcc634..7205cdb3548 100644
--- a/source/blender/editors/interface/interface_templates.c
+++ b/source/blender/editors/interface/interface_templates.c
@@ -974,7 +974,7 @@ static uiLayout *draw_modifier(
 			}
 			
 			UI_block_lock_clear(block);
-			UI_block_lock_set(block, ob && ob->id.lib, ERROR_LIBDATA_MESSAGE);
+			UI_block_lock_set(block, ob && ID_IS_LINKED_DATABLOCK(ob), ERROR_LIBDATA_MESSAGE);
 			
 			if (!ELEM(md->type, eModifierType_Fluidsim, eModifierType_Softbody, eModifierType_ParticleSystem,
 			           eModifierType_Cloth, eModifierType_Smoke))
@@ -1021,7 +1021,7 @@ uiLayout *uiTemplateModifier(uiLayout *layout, bContext *C, PointerRNA *ptr)
 		return NULL;
 	}
 	
-	UI_block_lock_set(uiLayoutGetBlock(layout), (ob && ob->id.lib), ERROR_LIBDATA_MESSAGE);
+	UI_block_lock_set(uiLayoutGetBlock(layout), (ob && ID_IS_LINKED_DATABLOCK(ob)), ERROR_LIBDATA_MESSAGE);
 	
 	/* find modifier and draw it */
 	cageIndex = modifiers_getCageIndex(scene, ob, &lastCageIndex, 0);
@@ -1249,7 +1249,7 @@ uiLayout *uiTemplateConstraint(uiLayout *layout, PointerRNA *ptr)
 		return NULL;
 	}
 	
-	UI_block_lock_set(uiLayoutGetBlock(layout), (ob && ob->id.lib), ERROR_LIBDATA_MESSAGE);
+	UI_block_lock_set(uiLayoutGetBlock(layout), (ob && ID_IS_LINKED_DATABLOCK(ob)), ERROR_LIBDATA_MESSAGE);
 
 	/* hrms, the temporal constraint should not draw! */
 	if (con->type == CONSTRAINT_TYPE_KINEMATIC) {
@@ -1611,7 +1611,7 @@ void uiTemplateColorRamp(uiLayout *layout, PointerRNA *ptr, const char *propname
 	block = uiLayoutAbsoluteBlock(layout);
 
 	id = cptr.id.data;
-	UI_block_lock_set(block, (id && id->lib), ERROR_LIBDATA_MESSAGE);
+	UI_block_lock_set(block, (id && ID_IS_LINKED_DATABLOCK(id)), ERROR_LIBDATA_MESSAGE);
 
 	colorband_buttons_layout(layout, block, cptr.data, &rect, cb, expand);
 
@@ -2263,7 +2263,7 @@ void uiTemplateCurveMapping(
 	cb->prop = prop;
 
 	id = cptr.id.data;
-	UI_block_lock_set(block, (id && id->lib), ERROR_LIBDATA_MESSAGE);
+	UI_block_lock_set(block, (id && ID_IS_LINKED_DATABLOCK(id)), ERROR_LIBDATA_MESSAGE);
 
 	curvemap_buttons_layout(layout, &cptr, type, levels, brush, neg_slope, cb);
 
diff --git a/source/blender/editors/mesh/editmesh_tools.c b/source/blender/editors/mesh/editmesh_tools.c
index 9f1602ccfaf..69db784038f 100644
--- a/source/blender/editors/mesh/editmesh_tools.c
+++ b/source/blender/editors/mesh/editmesh_tools.c
@@ -3292,7 +3292,7 @@ static int edbm_separate_exec(bContext *C, wmOperator *op)
 			Object *ob = base_iter->object;
 			if (ob->type == OB_MESH) {
 				Mesh *me = ob->data;
-				if (me->id.lib == NULL) {
+				if (!ID_IS_LINKED_DATABLOCK(me)) {
 					BMesh *bm_old = NULL;
 					int retval_iter = 0;
 
diff --git a/source/blender/editors/mesh/mesh_data.c b/source/blender/editors/mesh/mesh_data.c
index e0ddc017e93..772bb1bd308 100644
--- a/source/blender/editors/mesh/mesh_data.c
+++ b/source/blender/editors/mesh/mesh_data.c
@@ -511,7 +511,7 @@ static int layers_poll(bContext *C)
 {
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
-	return (ob && !ob->id.lib && ob->type == OB_MESH && data && !data->lib);
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) && ob->type == OB_MESH && data && !ID_IS_LINKED_DATABLOCK(data));
 }
 
 static int mesh_uv_texture_add_exec(bContext *C, wmOperator *UNUSED(op))
@@ -759,7 +759,7 @@ static int mesh_customdata_mask_clear_poll(bContext *C)
 			return false;
 		}
 
-		if (me->id.lib == NULL) {
+		if (!ID_IS_LINKED_DATABLOCK(me)) {
 			CustomData *data = GET_CD_DATA(me, vdata);
 			if (CustomData_has_layer(data, CD_PAINT_MASK)) {
 				return true;
@@ -813,7 +813,7 @@ static int mesh_customdata_skin_state(bContext *C)
 
 	if (ob && ob->type == OB_MESH) {
 		Mesh *me = ob->data;
-		if (me->id.lib == NULL) {
+		if (!ID_IS_LINKED_DATABLOCK(me)) {
 			CustomData *data = GET_CD_DATA(me, vdata);
 			return CustomData_has_layer(data, CD_MVERT_SKIN);
 		}
diff --git a/source/blender/editors/object/object_add.c b/source/blender/editors/object/object_add.c
index 0f1c72fcd55..69950ccc9a9 100644
--- a/source/blender/editors/object/object_add.c
+++ b/source/blender/editors/object/object_add.c
@@ -1162,7 +1162,7 @@ static int object_delete_exec(bContext *C, wmOperator *op)
 			Base *base_other;
 
 			for (scene_iter = bmain->scene.first; scene_iter; scene_iter = scene_iter->id.next) {
-				if (scene_iter != scene && !(scene_iter->id.lib)) {
+				if (scene_iter != scene && !ID_IS_LINKED_DATABLOCK(scene_iter)) {
 					base_other = BKE_scene_base_find(scene_iter, base->object);
 					if (base_other) {
 						if (is_indirectly_used && ID_REAL_USERS(base->object) <= 1) {
@@ -1515,7 +1515,8 @@ static int convert_poll(bContext *C)
 	Object *obact = CTX_data_active_object(C);
 	Scene *scene = CTX_data_scene(C);
 
-	return (!scene->id.lib && obact && scene->obedit != obact && (obact->flag & SELECT) && !(obact->id.lib));
+	return (!ID_IS_LINKED_DATABLOCK(scene) && obact && scene->obedit != obact &&
+	        (obact->flag & SELECT) && !ID_IS_LINKED_DATABLOCK(obact));
 }
 
 /* Helper for convert_exec */
@@ -2305,7 +2306,7 @@ static int join_poll(bContext *C)
 {
 	Object *ob = CTX_data_active_object(C);
 
-	if (!ob || ob->id.lib) return 0;
+	if (!ob || ID_IS_LINKED_DATABLOCK(ob)) return 0;
 
 	if (ELEM(ob->type, OB_MESH, OB_CURVE, OB_SURF, OB_ARMATURE))
 		return ED_operator_screenactive(C);
@@ -2358,7 +2359,7 @@ static int join_shapes_poll(bContext *C)
 {
 	Object *ob = CTX_data_active_object(C);
 
-	if (!ob || ob->id.lib) return 0;
+	if (!ob || ID_IS_LINKED_DATABLOCK(ob)) return 0;
 
 	/* only meshes supported at the moment */
 	if (ob->type == OB_MESH)
diff --git a/source/blender/editors/object/object_constraint.c b/source/blender/editors/object/object_constraint.c
index d7b7fd7040e..db8a4c1960f 100644
--- a/source/blender/editors/object/object_constraint.c
+++ b/source/blender/editors/object/object_constraint.c
@@ -584,7 +584,7 @@ static int edit_constraint_poll_generic(bContext *C, StructRNA *rna_type)
 		return 0;
 	}
 
-	if (ob->id.lib || (ptr.id.data && ((ID *)ptr.id.data)->lib)) {
+	if (ID_IS_LINKED_DATABLOCK(ob) || (ptr.id.data && ID_IS_LINKED_DATABLOCK(ptr.id.data))) {
 		CTX_wm_operator_poll_msg_set(C, "Cannot edit library data");
 		return 0;
 	}
diff --git a/source/blender/editors/object/object_data_transfer.c b/source/blender/editors/object/object_data_transfer.c
index 47ee6752e51..acee69daab7 100644
--- a/source/blender/editors/object/object_data_transfer.c
+++ b/source/blender/editors/object/object_data_transfer.c
@@ -300,7 +300,7 @@ static void data_transfer_exec_preprocess_objects(
 		}
 
 		me = ob->data;
-		if (me->id.lib) {
+		if (ID_IS_LINKED_DATABLOCK(me)) {
 			/* Do not transfer to linked data, not supported. */
 			BKE_reportf(op->reports, RPT_WARNING, "Skipping object '%s', linked data '%s' cannot be modified",
 			            ob->id.name + 2, me->id.name + 2);
@@ -330,7 +330,7 @@ static bool data_transfer_exec_is_object_valid(
 		me->id.tag &= ~LIB_TAG_DOIT;
 		return true;
 	}
-	else if (me->id.lib == NULL) {
+	else if (!ID_IS_LINKED_DATABLOCK(me)) {
 		/* Do not transfer apply operation more than once. */
 		/* XXX This is not nice regarding vgroups, which are half-Object data... :/ */
 		BKE_reportf(op->reports, RPT_WARNING,
@@ -387,7 +387,7 @@ static int data_transfer_exec(bContext *C, wmOperator *op)
 		return OPERATOR_FINISHED;
 	}
 
-	if (reverse_transfer && ((ID *)(ob_src->data))->lib) {
+	if (reverse_transfer && ID_IS_LINKED_DATABLOCK(ob_src->data)) {
 		/* Do not transfer to linked data, not supported. */
 		return OPERATOR_CANCELLED;
 	}
diff --git a/source/blender/editors/object/object_edit.c b/source/blender/editors/object/object_edit.c
index 01a567931b3..3dc7d8ebd4b 100644
--- a/source/blender/editors/object/object_edit.c
+++ b/source/blender/editors/object/object_edit.c
@@ -470,7 +470,7 @@ void ED_object_editmode_enter(bContext *C, int flag)
 	View3D *v3d = NULL;
 	bool ok = false;
 
-	if (scene->id.lib) return;
+	if (ID_IS_LINKED_DATABLOCK(scene)) return;
 
 	if (sa && sa->spacetype == SPACE_VIEW3D)
 		v3d = sa->spacedata.first;
@@ -539,7 +539,7 @@ void ED_object_editmode_enter(bContext *C, int flag)
 		 * BKE_object_obdata_is_libdata that prevent the bugfix #6614, so
 		 * i add this little hack here.
 		 */
-		if (arm->id.lib) {
+		if (ID_IS_LINKED_DATABLOCK(arm)) {
 			error_libdata();
 			return;
 		}
@@ -621,7 +621,7 @@ static int editmode_toggle_poll(bContext *C)
 	Object *ob = CTX_data_active_object(C);
 
 	/* covers proxies too */
-	if (ELEM(NULL, ob, ob->data) || ((ID *)ob->data)->lib)
+	if (ELEM(NULL, ob, ob->data) || ID_IS_LINKED_DATABLOCK(ob->data))
 		return 0;
 
 	/* if hidden but in edit mode, we still display */
@@ -848,7 +848,7 @@ static void copy_attr(Main *bmain, Scene *scene, View3D *v3d, short event)
 	Nurb *nu;
 	bool do_depgraph_update = false;
 	
-	if (scene->id.lib) return;
+	if (ID_IS_LINKED_DATABLOCK(scene)) return;
 
 	if (!(ob = OBACT)) return;
 	
@@ -1436,7 +1436,7 @@ static int shade_smooth_exec(bContext *C, wmOperator *op)
 	{
 		data = ob->data;
 
-		if (data && data->lib) {
+		if (data && ID_IS_LINKED_DATABLOCK(data)) {
 			linked_data = true;
 			continue;
 		}
@@ -1519,7 +1519,7 @@ static void UNUSED_FUNCTION(image_aspect) (Scene *scene, View3D *v3d)
 	int a, b, done;
 	
 	if (scene->obedit) return;  // XXX get from context
-	if (scene->id.lib) return;
+	if (ID_IS_LINKED_DATABLOCK(scene)) return;
 	
 	for (base = FIRSTBASE; base; base = base->next) {
 		if (TESTBASELIB(v3d, base)) {
diff --git a/source/blender/editors/object/object_modifier.c b/source/blender/editors/object/object_modifier.c
index 264945b00bf..b44ddf925a8 100644
--- a/source/blender/editors/object/object_modifier.c
+++ b/source/blender/editors/object/object_modifier.c
@@ -817,9 +817,9 @@ int edit_modifier_poll_generic(bContext *C, StructRNA *rna_type, int obtype_flag
 	PointerRNA ptr = CTX_data_pointer_get_type(C, "modifier", rna_type);
 	Object *ob = (ptr.id.data) ? ptr.id.data : ED_object_active_context(C);
 	
-	if (!ob || ob->id.lib) return 0;
+	if (!ob || ID_IS_LINKED_DATABLOCK(ob)) return 0;
 	if (obtype_flag && ((1 << ob->type) & obtype_flag) == 0) return 0;
-	if (ptr.id.data && ((ID *)ptr.id.data)->lib) return 0;
+	if (ptr.id.data && ID_IS_LINKED_DATABLOCK(ptr.id.data)) return 0;
 	
 	return 1;
 }
diff --git a/source/blender/editors/object/object_relations.c b/source/blender/editors/object/object_relations.c
index 94d1a258063..9a6fe5ae48b 100644
--- a/source/blender/editors/object/object_relations.c
+++ b/source/blender/editors/object/object_relations.c
@@ -291,17 +291,17 @@ static int make_proxy_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 	Object *ob = ED_object_active_context(C);
 
 	/* sanity checks */
-	if (!scene || scene->id.lib || !ob)
+	if (!scene || ID_IS_LINKED_DATABLOCK(scene) || !ob)
 		return OPERATOR_CANCELLED;
 
 	/* Get object to work on - use a menu if we need to... */
-	if (ob->dup_group && ob->dup_group->id.lib) {
+	if (ob->dup_group && ID_IS_LINKED_DATABLOCK(ob->dup_group)) {
 		/* gives menu with list of objects in group */
 		/* proxy_group_objects_menu(C, op, ob, ob->dup_group); */
 		WM_enum_search_invoke(C, op, event);
 		return OPERATOR_CANCELLED;
 	}
-	else if (ob->id.lib) {
+	else if (ID_IS_LINKED_DATABLOCK(ob)) {
 		uiPopupMenu *pup = UI_popup_menu_begin(C, IFACE_("OK?"), ICON_QUESTION);
 		uiLayout *layout = UI_popup_menu_layout(pup);
 
@@ -1466,7 +1466,7 @@ static int make_links_scene_exec(bContext *C, wmOperator *op)
 		return OPERATOR_CANCELLED;
 	}
 
-	if (scene_to->id.lib) {
+	if (ID_IS_LINKED_DATABLOCK(scene_to)) {
 		BKE_report(op->reports, RPT_ERROR, "Cannot link objects into a linked scene");
 		return OPERATOR_CANCELLED;
 	}
@@ -1579,7 +1579,7 @@ static int make_links_data_exec(bContext *C, wmOperator *op)
 					case MAKE_LINKS_ANIMDATA:
 						BKE_animdata_copy_id((ID *)ob_dst, (ID *)ob_src, false);
 						if (ob_dst->data && ob_src->data) {
-							if (obdata_id->lib) {
+							if (ID_IS_LINKED_DATABLOCK(obdata_id)) {
 								is_lib = true;
 								break;
 							}
@@ -1621,7 +1621,7 @@ static int make_links_data_exec(bContext *C, wmOperator *op)
 						Curve *cu_src = ob_src->data;
 						Curve *cu_dst = ob_dst->data;
 
-						if (obdata_id->lib) {
+						if (ID_IS_LINKED_DATABLOCK(obdata_id)) {
 							is_lib = true;
 							break;
 						}
@@ -1749,7 +1749,7 @@ static void single_object_users(Main *bmain, Scene *scene, View3D *v3d, const in
 		ob = base->object;
 
 		if ((base->flag & flag) == flag) {
-			if (ob->id.lib == NULL && ob->id.us > 1) {
+			if (!ID_IS_LINKED_DATABLOCK(ob) && ob->id.us > 1) {
 				/* base gets copy of object */
 				obn = BKE_object_copy(ob);
 				base->object = obn;
@@ -1828,7 +1828,7 @@ static void new_id_matar(Material **matar, const int totcol)
 
 	for (a = 0; a < totcol; a++) {
 		id = (ID *)matar[a];
-		if (id && id->lib == NULL) {
+		if (id && !ID_IS_LINKED_DATABLOCK(id)) {
 			if (id->newid) {
 				matar[a] = (Material *)id->newid;
 				id_us_plus(id->newid);
@@ -1857,10 +1857,10 @@ static void single_obdata_users(Main *bmain, Scene *scene, const int flag)
 
 	for (base = FIRSTBASE; base; base = base->next) {
 		ob = base->object;
-		if (ob->id.lib == NULL && (base->flag & flag) == flag) {
+		if (!ID_IS_LINKED_DATABLOCK(ob) && (base->flag & flag) == flag) {
 			id = ob->data;
 
-			if (id && id->us > 1 && id->lib == NULL) {
+			if (id && id->us > 1 && !ID_IS_LINKED_DATABLOCK(id)) {
 				DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
 
 				switch (ob->type) {
@@ -1938,7 +1938,7 @@ static void single_object_action_users(Scene *scene, const int flag)
 
 	for (base = FIRSTBASE; base; base = base->next) {
 		ob = base->object;
-		if (ob->id.lib == NULL && (flag == 0 || (base->flag & SELECT)) ) {
+		if (!ID_IS_LINKED_DATABLOCK(ob) && (flag == 0 || (base->flag & SELECT)) ) {
 			DAG_id_tag_update(&ob->id, OB_RECALC_DATA);
 			BKE_animdata_copy_id_action(&ob->id);
 		}
@@ -1955,7 +1955,7 @@ static void single_mat_users(Scene *scene, const int flag, const bool do_texture
 
 	for (base = FIRSTBASE; base; base = base->next) {
 		ob = base->object;
-		if (ob->id.lib == NULL && (flag == 0 || (base->flag & SELECT)) ) {
+		if (!ID_IS_LINKED_DATABLOCK(ob) && (flag == 0 || (base->flag & SELECT)) ) {
 			for (a = 1; a <= ob->totcol; a++) {
 				ma = give_current_material(ob, a);
 				if (ma) {
@@ -2184,7 +2184,7 @@ static bool make_local_all__instance_indirect_unused(Main *bmain, Scene *scene)
 	bool changed = false;
 
 	for (ob = bmain->object.first; ob; ob = ob->id.next) {
-		if (ob->id.lib && (ob->id.us == 0)) {
+		if (ID_IS_LINKED_DATABLOCK(ob) && (ob->id.us == 0)) {
 			Base *base;
 
 			id_us_plus(&ob->id);
diff --git a/source/blender/editors/object/object_shapekey.c b/source/blender/editors/object/object_shapekey.c
index 39bd34456be..e04114761e4 100644
--- a/source/blender/editors/object/object_shapekey.c
+++ b/source/blender/editors/object/object_shapekey.c
@@ -225,7 +225,7 @@ static int shape_key_mode_poll(bContext *C)
 {
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
-	return (ob && !ob->id.lib && data && !data->lib && ob->mode != OB_MODE_EDIT);
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data) && ob->mode != OB_MODE_EDIT);
 }
 
 static int shape_key_mode_exists_poll(bContext *C)
@@ -234,7 +234,7 @@ static int shape_key_mode_exists_poll(bContext *C)
 	ID *data = (ob) ? ob->data : NULL;
 
 	/* same as shape_key_mode_poll */
-	return (ob && !ob->id.lib && data && !data->lib && ob->mode != OB_MODE_EDIT) &&
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data) && ob->mode != OB_MODE_EDIT) &&
 	       /* check a keyblock exists */
 	       (BKE_keyblock_from_object(ob) != NULL);
 }
@@ -246,14 +246,15 @@ static int shape_key_move_poll(bContext *C)
 	ID *data = (ob) ? ob->data : NULL;
 	Key *key = BKE_key_from_object(ob);
 
-	return (ob && !ob->id.lib && data && !data->lib && ob->mode != OB_MODE_EDIT && key && key->totkey > 1);
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data) &&
+	        ob->mode != OB_MODE_EDIT && key && key->totkey > 1);
 }
 
 static int shape_key_poll(bContext *C)
 {
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
-	return (ob && !ob->id.lib && data && !data->lib);
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data));
 }
 
 static int shape_key_add_exec(bContext *C, wmOperator *op)
diff --git a/source/blender/editors/object/object_transform.c b/source/blender/editors/object/object_transform.c
index d2bbb73b597..6d80c4af292 100644
--- a/source/blender/editors/object/object_transform.c
+++ b/source/blender/editors/object/object_transform.c
@@ -391,7 +391,7 @@ static int apply_objects_internal(bContext *C, ReportList *reports, bool apply_l
 				changed = false;
 			}
 
-			if (obdata->lib) {
+			if (ID_IS_LINKED_DATABLOCK(obdata)) {
 				BKE_reportf(reports, RPT_ERROR,
 				            "Cannot apply to library data: Object \"%s\", %s \"%s\", aborting",
 				            ob->id.name + 2, BKE_idcode_to_name(GS(obdata->name)), obdata->name + 2);
@@ -792,7 +792,7 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
 			if (ob->data == NULL) {
 				/* special support for dupligroups */
 				if ((ob->transflag & OB_DUPLIGROUP) && ob->dup_group && (ob->dup_group->id.tag & LIB_TAG_DOIT) == 0) {
-					if (ob->dup_group->id.lib) {
+					if (ID_IS_LINKED_DATABLOCK(ob->dup_group)) {
 						tot_lib_error++;
 					}
 					else {
@@ -817,7 +817,7 @@ static int object_origin_set_exec(bContext *C, wmOperator *op)
 					}
 				}
 			}
-			else if (((ID *)ob->data)->lib) {
+			else if (ID_IS_LINKED_DATABLOCK(ob->data)) {
 				tot_lib_error++;
 			}
 
diff --git a/source/blender/editors/object/object_vgroup.c b/source/blender/editors/object/object_vgroup.c
index 414cc476be5..6e8aaebcccc 100644
--- a/source/blender/editors/object/object_vgroup.c
+++ b/source/blender/editors/object/object_vgroup.c
@@ -2447,8 +2447,8 @@ static int vertex_group_poll(bContext *C)
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
 
-	return (ob && !ob->id.lib &&
-	        data && !data->lib &&
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) &&
+	        data && !ID_IS_LINKED_DATABLOCK(data) &&
 	        OB_TYPE_SUPPORT_VGROUP(ob->type) &&
 	        ob->defbase.first);
 }
@@ -2457,7 +2457,8 @@ static int vertex_group_supported_poll(bContext *C)
 {
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
-	return (ob && !ob->id.lib && OB_TYPE_SUPPORT_VGROUP(ob->type) && data && !data->lib);
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) && OB_TYPE_SUPPORT_VGROUP(ob->type) &&
+	        data && !ID_IS_LINKED_DATABLOCK(data));
 }
 
 static int vertex_group_mesh_poll(bContext *C)
@@ -2465,8 +2466,8 @@ static int vertex_group_mesh_poll(bContext *C)
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
 
-	return (ob && !ob->id.lib &&
-	        data && !data->lib &&
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) &&
+	        data && !ID_IS_LINKED_DATABLOCK(data) &&
 	        ob->type == OB_MESH &&
 	        ob->defbase.first);
 }
@@ -2475,7 +2476,7 @@ static int UNUSED_FUNCTION(vertex_group_mesh_supported_poll)(bContext *C)
 {
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
-	return (ob && !ob->id.lib && ob->type == OB_MESH && data && !data->lib);
+	return (ob && !ID_IS_LINKED_DATABLOCK(ob) && ob->type == OB_MESH && data && !ID_IS_LINKED_DATABLOCK(data));
 }
 
 
@@ -2484,7 +2485,7 @@ static int UNUSED_FUNCTION(vertex_group_poll_edit) (bContext *C)
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
 
-	if (!(ob && !ob->id.lib && data && !data->lib))
+	if (!(ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data)))
 		return 0;
 
 	return BKE_object_is_in_editmode_vgroup(ob);
@@ -2496,7 +2497,7 @@ static int vertex_group_vert_select_poll_ex(bContext *C, const short ob_type_fla
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
 
-	if (!(ob && !ob->id.lib && data && !data->lib))
+	if (!(ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data)))
 		return false;
 
 	if (ob_type_flag && (((1 << ob->type) & ob_type_flag)) == 0) {
@@ -2536,7 +2537,7 @@ static int vertex_group_vert_select_unlocked_poll(bContext *C)
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
 
-	if (!(ob && !ob->id.lib && data && !data->lib))
+	if (!(ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data)))
 		return 0;
 
 	if (!(BKE_object_is_in_editmode_vgroup(ob) ||
@@ -2559,7 +2560,7 @@ static int vertex_group_vert_select_mesh_poll(bContext *C)
 	Object *ob = ED_object_context(C);
 	ID *data = (ob) ? ob->data : NULL;
 
-	if (!(ob && !ob->id.lib && data && !data->lib))
+	if (!(ob && !ID_IS_LINKED_DATABLOCK(ob) && data && !ID_IS_LINKED_DATABLOCK(data)))
 		return 0;
 
 	/* only difference to #vertex_group_vert_select_poll */
@@ -2748,7 +2749,7 @@ static int vertex_group_select_exec(bContext *C, wmOperator *UNUSED(op))
 {
 	Object *ob = ED_object_context(C);
 
-	if (!ob || ob->id.lib)
+	if (!ob || ID_IS_LINKED_DATABLOCK(ob))
 		return OPERATOR_CANCELLED;
 
 	vgroup_select_verts(ob, 1);
diff --git a/source/blender/editors/physics/particle_edit.c b/source/blender/editors/physics/particle_edit.c
index 30c102b70c5..e22a145b3a6 100644
--- a/source/blender/editors/physics/particle_edit.c
+++ b/source/blender/editors/physics/particle_edit.c
@@ -4693,7 +4693,7 @@ static int particle_edit_toggle_poll(bContext *C)
 
 	if (ob == NULL || ob->type != OB_MESH)
 		return 0;
-	if (!ob->data || ((ID *)ob->data)->lib)
+	if (!ob->data || ID_IS_LINKED_DATABLOCK(ob->data))
 		return 0;
 	if (CTX_data_edit_object(C))
 		return 0;
diff --git a/source/blender/editors/physics/particle_object.c b/source/blender/editors/physics/particle_object.c
index 1297133e1a2..d6c89b9c7a5 100644
--- a/source/blender/editors/physics/particle_object.c
+++ b/source/blender/editors/physics/particle_object.c
@@ -974,7 +974,7 @@ static void remove_particle_systems_from_object(Object *ob_to)
 	
 	if (ob_to->type != OB_MESH)
 		return;
-	if (!ob_to->data || ((ID *)ob_to->data)->lib)
+	if (!ob_to->data || ID_IS_LINKED_DATABLOCK(ob_to->data))
 		return;
 	
 	for (md = ob_to->modifiers.first; md; md = md_next) {
@@ -1004,7 +1004,7 @@ static bool copy_particle_systems_to_object(Scene *scene, Object *ob_from, Parti
 	
 	if (ob_to->type != OB_MESH)
 		return false;
-	if (!ob_to->data || ((ID *)ob_to->data)->lib)
+	if (!ob_to->data || ID_IS_LINKED_DATABLOCK(ob_to->data))
 		return false;
 	
 	/* For remapping we need a valid DM.
diff --git a/source/blender/editors/screen/screen_ops.c b/source/blender/editors/screen/screen_ops.c
index 0c0a6c93b3e..04a8f0a3a51 100644
--- a/source/blender/editors/screen/screen_ops.c
+++ b/source/blender/editors/screen/screen_ops.c
@@ -168,7 +168,7 @@ int ED_operator_screen_mainwinactive(bContext *C)
 int ED_operator_scene_editable(bContext *C)
 {
 	Scene *scene = CTX_data_scene(C);
-	if (scene && scene->id.lib == NULL)
+	if (scene && !ID_IS_LINKED_DATABLOCK(scene))
 		return 1;
 	return 0;
 }
@@ -178,7 +178,7 @@ int ED_operator_objectmode(bContext *C)
 	Scene *scene = CTX_data_scene(C);
 	Object *obact = CTX_data_active_object(C);
 
-	if (scene == NULL || scene->id.lib)
+	if (scene == NULL || ID_IS_LINKED_DATABLOCK(scene))
 		return 0;
 	if (CTX_data_edit_object(C))
 		return 0;
@@ -279,7 +279,7 @@ int ED_operator_node_editable(bContext *C)
 {
 	SpaceNode *snode = CTX_wm_space_node(C);
 	
-	if (snode && snode->edittree && snode->edittree->id.lib == NULL)
+	if (snode && snode->edittree && !ID_IS_LINKED_DATABLOCK(snode->edittree))
 		return 1;
 	
 	return 0;
@@ -341,20 +341,20 @@ int ED_operator_object_active(bContext *C)
 int ED_operator_object_active_editable(bContext *C)
 {
 	Object *ob = ED_object_active_context(C);
-	return ((ob != NULL) && !(ob->id.lib) && !ed_object_hidden(ob));
+	return ((ob != NULL) && !ID_IS_LINKED_DATABLOCK(ob) && !ed_object_hidden(ob));
 }
 
 int ED_operator_object_active_editable_mesh(bContext *C)
 {
 	Object *ob = ED_object_active_context(C);
-	return ((ob != NULL) && !(ob->id.lib) && !ed_object_hidden(ob) &&
-	        (ob->type == OB_MESH) && !(((ID *)ob->data)->lib));
+	return ((ob != NULL) && !ID_IS_LINKED_DATABLOCK(ob) && !ed_object_hidden(ob) &&
+	        (ob->type == OB_MESH) && !ID_IS_LINKED_DATABLOCK(ob->data));
 }
 
 int ED_operator_object_active_editable_font(bContext *C)
 {
 	Object *ob = ED_object_active_context(C);
-	return ((ob != NULL) && !(ob->id.lib) && !ed_object_hidden(ob) &&
+	return ((ob != NULL) && !ID_IS_LINKED_DATABLOCK(ob) && !ed_object_hidden(ob) &&
 	        (ob->type == OB_FONT));
 }
 
diff --git a/source/blender/editors/sculpt_paint/paint_image.c b/source/blender/editors/sculpt_paint/paint_image.c
index 689b89e7b69..bf344e1f721 100644
--- a/source/blender/editors/sculpt_paint/paint_image.c
+++ b/source/blender/editors/sculpt_paint/paint_image.c
@@ -1342,7 +1342,7 @@ static int texture_paint_toggle_poll(bContext *C)
 	Object *ob = CTX_data_active_object(C);
 	if (ob == NULL || ob->type != OB_MESH)
 		return 0;
-	if (!ob->data || ((ID *)ob->data)->lib)
+	if (!ob->data || ID_IS_LINKED_DATABLOCK(ob->data))
 		return 0;
 	if (CTX_data_edit_object(C))
 		return 0;
diff --git a/source/blender/editors/sculpt_paint/paint_vertex.c b/source/blender/editors/sculpt_paint/paint_vertex.c
index 87855879ec5..3bcd610150c 100644
--- a/source/blender/editors/sculpt_paint/paint_vertex.c
+++ b/source/blender/editors/sculpt_paint/paint_vertex.c
@@ -247,7 +247,7 @@ static bool make_vertexcol(Object *ob)  /* single ob */
 {
 	Mesh *me;
 
-	if ((ob->id.lib) ||
+	if (ID_IS_LINKED_DATABLOCK(ob) ||
 	    ((me = BKE_mesh_from_object(ob)) == NULL) ||
 	    (me->totpoly == 0) ||
 	    (me->edit_btmesh))
@@ -1841,7 +1841,7 @@ static int paint_poll_test(bContext *C)
 	Object *ob = CTX_data_active_object(C);
 	if (ob == NULL || ob->type != OB_MESH)
 		return 0;
-	if (!ob->data || ((ID *)ob->data)->lib)
+	if (!ob->data || ID_IS_LINKED_DATABLOCK(ob->data))
 		return 0;
 	if (CTX_data_edit_object(C))
 		return 0;
diff --git a/source/blender/editors/space_logic/logic_ops.c b/source/blender/editors/space_logic/logic_ops.c
index 51f4a61047d..074368a82c5 100644
--- a/source/blender/editors/space_logic/logic_ops.c
+++ b/source/blender/editors/space_logic/logic_ops.c
@@ -65,7 +65,7 @@ static int edit_sensor_poll(bContext *C)
 {
 	PointerRNA ptr = CTX_data_pointer_get_type(C, "sensor", &RNA_Sensor);
 
-	if (ptr.data && ((ID *)ptr.id.data)->lib) return 0;
+	if (ptr.data && ID_IS_LINKED_DATABLOCK(ptr.id.data)) return 0;
 	return 1;
 }
 
@@ -73,7 +73,7 @@ static int edit_controller_poll(bContext *C)
 {
 	PointerRNA ptr = CTX_data_pointer_get_type(C, "controller", &RNA_Controller);
 
-	if (ptr.data && ((ID *)ptr.id.data)->lib) return 0;
+	if (ptr.data && ID_IS_LINKED_DATABLOCK(ptr.id.data)) return 0;
 	return 1;
 }
 
@@ -81,7 +81,7 @@ static int edit_actuator_poll(bContext *C)
 {
 	PointerRNA ptr = CTX_data_pointer_get_type(C, "actuator", &RNA_Actuator);
 
-	if (ptr.data && ((ID *)ptr.id.data)->lib) return 0;
+	if (ptr.data && ID_IS_LINKED_DATABLOCK(ptr.id.data)) return 0;
 	return 1;
 }
 
diff --git a/source/blender/editors/space_outliner/outliner_draw.c b/source/blender/editors/space_outliner/outliner_draw.c
index 43e9c262172..b8d3e2fb1fc 100644
--- a/source/blender/editors/space_outliner/outliner_draw.c
+++ b/source/blender/editors/space_outliner/outliner_draw.c
@@ -402,7 +402,7 @@ void restrictbutton_gr_restrict_flag(void *poin, void *poin2, int flag)
 
 	if (group_restrict_flag(gr, flag)) {
 		for (gob = gr->gobject.first; gob; gob = gob->next) {
-			if (gob->ob->id.lib)
+			if (ID_IS_LINKED_DATABLOCK(gob->ob))
 				continue;
 
 			gob->ob->restrictflag &= ~flag;
@@ -414,7 +414,7 @@ void restrictbutton_gr_restrict_flag(void *poin, void *poin2, int flag)
 	}
 	else {
 		for (gob = gr->gobject.first; gob; gob = gob->next) {
-			if (gob->ob->id.lib)
+			if (ID_IS_LINKED_DATABLOCK(gob->ob))
 				continue;
 
 			/* not in editmode */
@@ -655,7 +655,7 @@ static void outliner_draw_restrictbuts(uiBlock *block, Scene *scene, ARegion *ar
 				int but_flag = UI_BUT_DRAG_LOCK;
 				gr = (Group *)tselem->id;
 
-				if (gr->id.lib)
+				if (ID_IS_LINKED_DATABLOCK(gr))
 					but_flag |= UI_BUT_DISABLED;
 				
 				UI_block_emboss_set(block, UI_EMBOSS_NONE);
@@ -828,7 +828,7 @@ static void outliner_draw_userbuts(uiBlock *block, ARegion *ar, SpaceOops *soops
 				char buf[16] = "";
 				int but_flag = UI_BUT_DRAG_LOCK;
 
-				if (id->lib)
+				if (ID_IS_LINKED_DATABLOCK(id))
 					but_flag |= UI_BUT_DISABLED;
 
 				UI_block_emboss_set(block, UI_EMBOSS_NONE);
@@ -993,7 +993,8 @@ static void tselem_draw_icon_uibut(struct DrawIconArg *arg, int icon)
 	}
 	else {
 		uiBut *but = uiDefIconBut(arg->block, UI_BTYPE_LABEL, 0, icon, arg->xb, arg->yb, UI_UNIT_X, UI_UNIT_Y, NULL,
-		                          0.0, 0.0, 1.0, arg->alpha, (arg->id && arg->id->lib) ? arg->id->lib->name : "");
+		                          0.0, 0.0, 1.0, arg->alpha,
+		                          (arg->id && ID_IS_LINKED_DATABLOCK(arg->id)) ? arg->id->lib->name : "");
 		
 		if (arg->id)
 			UI_but_drag_set_id(but, arg->id);
@@ -1567,7 +1568,7 @@ static void outliner_draw_tree_element(
 		else
 			offsx += 2 * ufac;
 		
-		if (tselem->type == 0 && tselem->id->lib) {
+		if (tselem->type == 0 && ID_IS_LINKED_DATABLOCK(tselem->id)) {
 			glPixelTransferf(GL_ALPHA_SCALE, 0.5f);
 			if (tselem->id->tag & LIB_TAG_MISSING) {
 				UI_icon_draw((float)startx + offsx, (float)*starty + 2 * ufac, ICON_LIBRARY_DATA_BROKEN);
diff --git a/source/blender/editors/space_outliner/outliner_edit.c b/source/blender/editors/space_outliner/outliner_edit.c
index 07608b59d2e..b0cd3aabbfd 100644
--- a/source/blender/editors/space_outliner/outliner_edit.c
+++ b/source/blender/editors/space_outliner/outliner_edit.c
@@ -232,7 +232,7 @@ static void do_item_rename(ARegion *ar, TreeElement *te, TreeStoreElem *tselem,
 	else if (ELEM(tselem->type, TSE_SEQUENCE, TSE_SEQ_STRIP, TSE_SEQUENCE_DUP)) {
 		BKE_report(reports, RPT_WARNING, "Cannot edit sequence name");
 	}
-	else if (tselem->id->lib) {
+	else if (ID_IS_LINKED_DATABLOCK(tselem->id)) {
 		BKE_report(reports, RPT_WARNING, "Cannot edit external libdata");
 	}
 	else if (te->idcode == ID_LI && ((Library *)tselem->id)->parent) {
@@ -423,7 +423,7 @@ static int outliner_id_remap_exec(bContext *C, wmOperator *op)
 		return OPERATOR_CANCELLED;
 	}
 
-	if (old_id->lib) {
+	if (ID_IS_LINKED_DATABLOCK(old_id)) {
 		BKE_reportf(op->reports, RPT_WARNING,
 		            "Old ID '%s' is linked from a library, indirect usages of this datablock will not be remapped",
 		            old_id->name);
@@ -1982,7 +1982,7 @@ static int parent_drop_exec(bContext *C, wmOperator *op)
 	RNA_string_get(op->ptr, "child", childname);
 	ob = (Object *)BKE_libblock_find_name(ID_OB, childname);
 
-	if (ob->id.lib) {
+	if (ID_IS_LINKED_DATABLOCK(ob)) {
 		BKE_report(op->reports, RPT_INFO, "Can't edit library linked object");
 		return OPERATOR_CANCELLED;
 	}
@@ -2030,7 +2030,7 @@ static int parent_drop_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 		if (ob == par) {
 			return OPERATOR_CANCELLED;
 		}
-		if (ob->id.lib) {
+		if (ID_IS_LINKED_DATABLOCK(ob)) {
 			BKE_report(op->reports, RPT_INFO, "Can't edit library linked object");
 			return OPERATOR_CANCELLED;
 		}
@@ -2239,7 +2239,7 @@ static int scene_drop_invoke(bContext *C, wmOperator *op, const wmEvent *event)
 		RNA_string_get(op->ptr, "object", obname);
 		ob = (Object *)BKE_libblock_find_name(ID_OB, obname);
 
-		if (ELEM(NULL, ob, scene) || scene->id.lib != NULL) {
+		if (ELEM(NULL, ob, scene) || ID_IS_LINKED_DATABLOCK(scene)) {
 			return OPERATOR_CANCELLED;
 		}
 
diff --git a/source/blender/editors/space_outliner/outliner_tools.c b/source/blender/editors/space_outliner/outliner_tools.c
index bfec62997e1..13adaff5224 100644
--- a/source/blender/editors/space_outliner/outliner_tools.c
+++ b/source/blender/editors/space_outliner/outliner_tools.c
@@ -435,7 +435,7 @@ static void id_local_cb(
         bContext *C, ReportList *UNUSED(reports), Scene *UNUSED(scene), TreeElement *UNUSED(te),
         TreeStoreElem *UNUSED(tsep), TreeStoreElem *tselem, void *UNUSED(user_data))
 {
-	if (tselem->id->lib && (tselem->id->tag & LIB_TAG_EXTERN)) {
+	if (ID_IS_LINKED_DATABLOCK(tselem->id) && (tselem->id->tag & LIB_TAG_EXTERN)) {
 		/* if the ID type has no special local function,
 		 * just clear the lib */
 		if (id_make_local(tselem->id, false) == false) {
diff --git a/source/blender/editors/space_outliner/outliner_tree.c b/source/blender/editors/space_outliner/outliner_tree.c
index a687f61d69f..b22e6595caf 100644
--- a/source/blender/editors/space_outliner/outliner_tree.c
+++ b/source/blender/editors/space_outliner/outliner_tree.c
@@ -490,7 +490,7 @@ static void outliner_add_object_contents(SpaceOops *soops, TreeElement *te, Tree
 	
 	outliner_add_element(soops, &te->subtree, ob->poselib, te, 0, 0); // XXX FIXME.. add a special type for this
 	
-	if (ob->proxy && ob->id.lib == NULL)
+	if (ob->proxy && !ID_IS_LINKED_DATABLOCK(ob))
 		outliner_add_element(soops, &te->subtree, ob->proxy, te, TSE_PROXY, 0);
 		
 	outliner_add_element(soops, &te->subtree, ob->gpd, te, 0, 0);
diff --git a/source/blender/editors/space_text/text_ops.c b/source/blender/editors/space_text/text_ops.c
index 94ed280f792..e7428fd79d9 100644
--- a/source/blender/editors/space_text/text_ops.c
+++ b/source/blender/editors/space_text/text_ops.c
@@ -92,7 +92,7 @@ static int text_edit_poll(bContext *C)
 	if (!text)
 		return 0;
 
-	if (text->id.lib) {
+	if (ID_IS_LINKED_DATABLOCK(text)) {
 		// BKE_report(op->reports, RPT_ERROR, "Cannot edit external libdata");
 		return 0;
 	}
@@ -108,7 +108,7 @@ int text_space_edit_poll(bContext *C)
 	if (!st || !text)
 		return 0;
 
-	if (text->id.lib) {
+	if (ID_IS_LINKED_DATABLOCK(text)) {
 		// BKE_report(op->reports, RPT_ERROR, "Cannot edit external libdata");
 		return 0;
 	}
@@ -128,7 +128,7 @@ static int text_region_edit_poll(bContext *C)
 	if (!ar || ar->regiontype != RGN_TYPE_WINDOW)
 		return 0;
 
-	if (text->id.lib) {
+	if (ID_IS_LINKED_DATABLOCK(text)) {
 		// BKE_report(op->reports, RPT_ERROR, "Cannot edit external libdata");
 		return 0;
 	}
diff --git a/source/blender/editors/space_view3d/drawobject.c b/source/blender/editors/space_view3d/drawobject.c
index 128adc8269b..4320699b8d7 100644
--- a/source/blender/editors/space_view3d/drawobject.c
+++ b/source/blender/editors/space_view3d/drawobject.c
@@ -7334,7 +7334,7 @@ static void draw_object_wire_color(Scene *scene, Base *base, unsigned char r_ob_
 	}
 	else {
 		/* Sets the 'colindex' */
-		if (ob->id.lib) {
+		if (ID_IS_LINKED_DATABLOCK(ob)) {
 			colindex = (base->flag & (SELECT + BA_WAS_SEL)) ? 2 : 1;
 		}
 		/* Sets the 'theme_id' or fallback to wire */
@@ -8090,7 +8090,7 @@ void draw_object(Scene *scene, ARegion *ar, View3D *v3d, Base *base, const short
 				    !(G.f & G_RENDER_OGL))
 				{
 					/* check > 0 otherwise grease pencil can draw into the circle select which is annoying. */
-					drawcentercircle(v3d, rv3d, ob->obmat[3], do_draw_center, ob->id.lib || ob->id.us > 1);
+					drawcentercircle(v3d, rv3d, ob->obmat[3], do_draw_center, ID_IS_LINKED_DATABLOCK(ob) || ob->id.us > 1);
 				}
 			}
 		}
diff --git a/source/blender/editors/space_view3d/view3d_edit.c b/source/blender/editors/space_view3d/view3d_edit.c
index 907fe90c067..4d5d03d6c9b 100644
--- a/source/blender/editors/space_view3d/view3d_edit.c
+++ b/source/blender/editors/space_view3d/view3d_edit.c
@@ -110,7 +110,7 @@ static bool view3d_operator_offset_lock_check(bContext *C, wmOperator *op)
 bool ED_view3d_camera_lock_check(const View3D *v3d, const RegionView3D *rv3d)
 {
 	return ((v3d->camera) &&
-	        (v3d->camera->id.lib == NULL) &&
+	        (!ID_IS_LINKED_DATABLOCK(v3d->camera)) &&
 	        (v3d->flag2 & V3D_LOCK_CAMERA) &&
 	        (rv3d->persp == RV3D_CAMOB));
 }
diff --git a/source/blender/editors/space_view3d/view3d_fly.c b/source/blender/editors/space_view3d/view3d_fly.c
index 8418cf0980c..31377d0fce8 100644
--- a/source/blender/editors/space_view3d/view3d_fly.c
+++ b/source/blender/editors/space_view3d/view3d_fly.c
@@ -346,7 +346,7 @@ static bool initFlyInfo(bContext *C, FlyInfo *fly, wmOperator *op, const wmEvent
 		fly->rv3d->persp = RV3D_PERSP;
 	}
 
-	if (fly->rv3d->persp == RV3D_CAMOB && fly->v3d->camera->id.lib) {
+	if (fly->rv3d->persp == RV3D_CAMOB && ID_IS_LINKED_DATABLOCK(fly->v3d->camera)) {
 		BKE_report(op->reports, RPT_ERROR, "Cannot fly a camera from an external library");
 		return false;
 	}
diff --git a/source/blender/editors/space_view3d/view3d_view.c b/source/blender/editors/space_view3d/view3d_view.c
index c35646b9e92..00fd3cd48e5 100644
--- a/source/blender/editors/space_view3d/view3d_view.c
+++ b/source/blender/editors/space_view3d/view3d_view.c
@@ -507,7 +507,7 @@ static int view3d_camera_to_view_poll(bContext *C)
 
 	if (ED_view3d_context_user_region(C, &v3d, &ar)) {
 		RegionView3D *rv3d = ar->regiondata;
-		if (v3d && v3d->camera && v3d->camera->id.lib == NULL) {
+		if (v3d && v3d->camera && !ID_IS_LINKED_DATABLOCK(v3d->camera)) {
 			if (rv3d && (rv3d->viewlock & RV3D_LOCKED) == 0) {
 				if (rv3d->persp != RV3D_CAMOB) {
 					return 1;
diff --git a/source/blender/editors/space_view3d/view3d_walk.c b/source/blender/editors/space_view3d/view3d_walk.c
index 384da277612..3269e0cfbfc 100644
--- a/source/blender/editors/space_view3d/view3d_walk.c
+++ b/source/blender/editors/space_view3d/view3d_walk.c
@@ -505,7 +505,7 @@ static bool initWalkInfo(bContext *C, WalkInfo *walk, wmOperator *op)
 		walk->rv3d->persp = RV3D_PERSP;
 	}
 
-	if (walk->rv3d->persp == RV3D_CAMOB && walk->v3d->camera->id.lib) {
+	if (walk->rv3d->persp == RV3D_CAMOB && ID_IS_LINKED_DATABLOCK(walk->v3d->camera)) {
 		BKE_report(op->reports, RPT_ERROR, "Cannot navigate a camera from an external library");
 		return false;
 	}
diff --git a/source/blender/editors/transform/transform_conversions.c b/source/blender/editors/transform/transform_conversions.c
index 707c60f8701..fc32613c1ab 100644
--- a/source/blender/editors/transform/transform_conversions.c
+++ b/source/blender/editors/transform/transform_conversions.c
@@ -6429,7 +6429,7 @@ static void createTransObject(bContext *C, TransInfo *t)
 		}
 		
 		/* select linked objects, but skip them later */
-		if (ob->id.lib != NULL) {
+		if (ID_IS_LINKED_DATABLOCK(ob)) {
 			td->flag |= TD_SKIP;
 		}
 		
diff --git a/source/blender/editors/util/ed_util.c b/source/blender/editors/util/ed_util.c
index e2f60955c81..1f1a778cac7 100644
--- a/source/blender/editors/util/ed_util.c
+++ b/source/blender/editors/util/ed_util.c
@@ -105,7 +105,7 @@ void ED_editors_init(bContext *C)
 			ob->mode = OB_MODE_OBJECT;
 			data = ob->data;
 
-			if (ob == obact && !ob->id.lib && !(data && data->lib))
+			if (ob == obact && !ID_IS_LINKED_DATABLOCK(ob) && !(data && ID_IS_LINKED_DATABLOCK(data)))
 				ED_object_toggle_modes(C, mode);
 		}
 	}