code cleanup: move get_selected_defgroups into object_deform.c and make it behave like similar functions, also when drawing vertex weight colors, only call this function when multi-paint is enabled.

source/blender/blenkernel/BKE_armature.h

@@ -101,8 +101,6 @@ void get_objectspace_bone_matrix(struct Bone *bone, float M_accumulatedMatrix[][
 void vec_roll_to_mat3(const float vec[3], const float roll, float mat[][3]);
 void mat3_to_vec_roll(float mat[][3], float *vec, float *roll);
 
-int get_selected_defgroups(struct Object *ob, char *defbase_sel, int defbase_len);
-
 /* Common Conversions Between Co-ordinate Spaces */
 void BKE_armature_mat_world_to_pose(struct Object *ob, float inmat[][4], float outmat[][4]);
 void BKE_armature_loc_world_to_pose(struct Object *ob, const float inloc[3], float outloc[3]);

source/blender/blenkernel/BKE_object_deform.h

@@ -33,5 +33,6 @@ struct Object;
 
 char *BKE_objdef_lock_flags_get(struct Object *ob, const int defbase_tot);
 char *BKE_objdef_validmap_get(struct Object *ob, const int defbase_tot);
+char *BKE_objdef_selected_get(struct Object *ob, int defbase_tot, int *r_dg_flags_sel_tot);
 
 #endif  /* __BKE_OBJECT_DEFORM_H__ */

source/blender/blenkernel/intern/DerivedMesh.c

@@ -59,6 +59,7 @@
 #include "BKE_modifier.h"
 #include "BKE_mesh.h"
 #include "BKE_object.h"
+#include "BKE_object_deform.h"
 #include "BKE_paint.h"
 #include "BKE_texture.h"
 #include "BKE_multires.h"
@@ -1015,14 +1016,14 @@ static void calc_weightpaint_vert_color(
         unsigned char r_col[4],
         MDeformVert *dv, ColorBand *coba,
         const int defbase_tot, const int defbase_act,
-        const char *dg_flags,
-        const int selected, const int draw_flag)
+        const char *defbase_sel, const int defbase_sel_tot,
+        const int draw_flag)
 {
 	float input = 0.0f;
 	
 	int make_black = FALSE;
 
-	if ((selected > 1) && (draw_flag & CALC_WP_MULTIPAINT)) {
+	if ((defbase_sel_tot > 1) && (draw_flag & CALC_WP_MULTIPAINT)) {
 		int was_a_nonzero = FALSE;
 		unsigned int i;
 
@@ -1031,7 +1032,7 @@ static void calc_weightpaint_vert_color(
 			/* in multipaint, get the average if auto normalize is inactive
 			 * get the sum if it is active */
 			if (dw->def_nr < defbase_tot) {
-				if (dg_flags[dw->def_nr]) {
+				if (defbase_sel[dw->def_nr]) {
 					if (dw->weight) {
 						input += dw->weight;
 						was_a_nonzero = TRUE;
@@ -1045,7 +1046,7 @@ static void calc_weightpaint_vert_color(
 			make_black = TRUE;
 		}
 		else if ((draw_flag & CALC_WP_AUTO_NORMALIZE) == FALSE) {
-			input /= selected; /* get the average */
+			input /= defbase_sel_tot; /* get the average */
 		}
 	}
 	else {
@@ -1090,14 +1091,21 @@ static unsigned char *calc_weightpaint_vert_array(Object *ob, DerivedMesh *dm, i
 		/* variables for multipaint */
 		const int defbase_tot = BLI_countlist(&ob->defbase);
 		const int defbase_act = ob->actdef - 1;
-		char *dg_flags = MEM_mallocN(defbase_tot * sizeof(char), __func__);
-		const int selected = get_selected_defgroups(ob, dg_flags, defbase_tot);
 
-		for (i = numVerts; i != 0; i--, wc += 4, dv++) {
-			calc_weightpaint_vert_color(wc, dv, coba, defbase_tot, defbase_act, dg_flags, selected, draw_flag);
+		int defbase_sel_tot = 0;
+		char *defbase_sel = NULL;
+
+		if (draw_flag & CALC_WP_MULTIPAINT) {
+			defbase_sel = BKE_objdef_selected_get(ob, defbase_tot, &defbase_sel_tot);
 		}
 
-		MEM_freeN(dg_flags);
+		for (i = numVerts; i != 0; i--, wc += 4, dv++) {
+			calc_weightpaint_vert_color(wc, dv, coba, defbase_tot, defbase_act, defbase_sel, defbase_sel_tot, draw_flag);
+		}
+
+		if (defbase_sel) {
+			MEM_freeN(defbase_sel);
+		}
 	}
 	else {
 		int col_i;

source/blender/blenkernel/intern/armature.c

@@ -2517,36 +2517,6 @@ void BKE_pose_where_is(Scene *scene, Object *ob)
 	}
 }
 
-
-/* Returns total selected vgroups,
- * wpi.defbase_sel is assumed malloc'd, all values are set */
-int get_selected_defgroups(Object *ob, char *dg_selection, int defbase_tot)
-{
-	bDeformGroup *defgroup;
-	unsigned int i;
-	Object *armob = BKE_object_pose_armature_get(ob);
-	int dg_flags_sel_tot = 0;
-
-	if (armob) {
-		bPose *pose = armob->pose;
-		for (i = 0, defgroup = ob->defbase.first; i < defbase_tot && defgroup; defgroup = defgroup->next, i++) {
-			bPoseChannel *pchan = BKE_pose_channel_find_name(pose, defgroup->name);
-			if (pchan && (pchan->bone->flag & BONE_SELECTED)) {
-				dg_selection[i] = TRUE;
-				dg_flags_sel_tot++;
-			}
-			else {
-				dg_selection[i] = FALSE;
-			}
-		}
-	}
-	else {
-		memset(dg_selection, FALSE, sizeof(char) * defbase_tot);
-	}
-
-	return dg_flags_sel_tot;
-}
-
 /************** Bounding box ********************/
 static int minmax_armature(Object *ob, float r_min[3], float r_max[3])
 {

source/blender/blenkernel/intern/deform.c

@@ -210,7 +210,9 @@ void defvert_normalize_lock(MDeformVert *dvert, const int def_nr_lock)
 		/* nothing */
 	}
 	else if (dvert->totweight == 1) {
-		dvert->dw[0].weight = 1.0f;
+		if (def_nr_lock != 0) {
+			dvert->dw[0].weight = 1.0f;
+		}
 	}
 	else {
 		MDeformWeight *dw_lock = NULL;

source/blender/blenkernel/intern/object_deform.c

@@ -23,13 +23,16 @@
  */
 
 #include <stdlib.h>
+#include <string.h>
 
 #include "MEM_guardedalloc.h"
 
 #include "BLI_utildefines.h"
 #include "BLI_ghash.h"
 
+#include "BKE_action.h"
 #include "BKE_object_deform.h"  /* own include */
+#include "BKE_object.h"
 #include "BKE_modifier.h"
 
 #include "DNA_armature_types.h"
@@ -121,3 +124,33 @@ char *BKE_objdef_validmap_get(Object *ob, const int defbase_tot)
 
 	return vgroup_validmap;
 }
+
+/* Returns total selected vgroups,
+ * wpi.defbase_sel is assumed malloc'd, all values are set */
+char *BKE_objdef_selected_get(Object *ob, int defbase_tot, int *r_dg_flags_sel_tot)
+{
+	char *dg_selection = MEM_mallocN(defbase_tot * sizeof(char), __func__);
+	bDeformGroup *defgroup;
+	unsigned int i;
+	Object *armob = BKE_object_pose_armature_get(ob);
+	(*r_dg_flags_sel_tot) = 0;
+
+	if (armob) {
+		bPose *pose = armob->pose;
+		for (i = 0, defgroup = ob->defbase.first; i < defbase_tot && defgroup; defgroup = defgroup->next, i++) {
+			bPoseChannel *pchan = BKE_pose_channel_find_name(pose, defgroup->name);
+			if (pchan && (pchan->bone->flag & BONE_SELECTED)) {
+				dg_selection[i] = TRUE;
+				(*r_dg_flags_sel_tot) += 1;
+			}
+			else {
+				dg_selection[i] = FALSE;
+			}
+		}
+	}
+	else {
+		memset(dg_selection, FALSE, sizeof(char) * defbase_tot);
+	}
+
+	return dg_selection;
+}

source/blender/editors/sculpt_paint/paint_vertex.c

@@ -2160,7 +2160,6 @@ static void wpaint_stroke_update_step(bContext *C, struct PaintStroke *stroke, P
 	float alpha;
 	float mval[2];
 	int use_vert_sel;
-	char *defbase_sel;
 
 	const float pressure = RNA_float_get(itemptr, "pressure");
 	const float brush_size_pressure = BKE_brush_size_get(scene, brush) * (BKE_brush_use_size_pressure(scene, brush) ? pressure : 1.0f);
@@ -2194,12 +2193,13 @@ static void wpaint_stroke_update_step(bContext *C, struct PaintStroke *stroke, P
 
 
 
+
 	/* *** setup WeightPaintInfo - pass onto do_weight_paint_vertex *** */
 	wpi.defbase_tot =        wpd->defbase_tot;
-	defbase_sel =            MEM_mallocN(wpi.defbase_tot * sizeof(char), "wpi.defbase_sel");
-	wpi.defbase_tot_sel =    get_selected_defgroups(ob, defbase_sel, wpi.defbase_tot);
-	wpi.defbase_sel =        defbase_sel; /* so we can stay const */
-	if (wpi.defbase_tot_sel == 0 && ob->actdef > 0) wpi.defbase_tot_sel = 1;
+	wpi.defbase_sel = BKE_objdef_selected_get(ob, wpi.defbase_tot, &wpi.defbase_tot_sel);
+	if (wpi.defbase_tot_sel == 0 && ob->actdef > 0) {
+		wpi.defbase_tot_sel = 1;
+	}
 
 	wpi.defbase_tot_unsel =  wpi.defbase_tot - wpi.defbase_tot_sel;
 	wpi.vgroup_active =      wpd->vgroup_active;