Transform: improve pose trans/rot/scale guessing

Switching the mode was being done per object,
where it should first check all pose bones from all objects.

This also removes code that changes the transform mode
from within the counting function.
This was only needed on transform initialization.

source/blender/editors/transform/transform.h

@@ -722,7 +722,7 @@ int  special_transform_moving(TransInfo *t);
 void transform_autoik_update(TransInfo *t, short mode);
 bool transdata_check_local_islands(TransInfo *t, short around);
 
-int count_set_pose_transflags(int *out_mode, short around, struct Object *ob);
+int count_set_pose_transflags(struct Object *ob, const int mode, const short around, bool has_translate_rotate[2]);
 
 /* auto-keying stuff used by special_aftertrans_update */
 void autokeyframe_ob_cb_func(

source/blender/editors/transform/transform_conversions.c

@@ -748,12 +748,11 @@ static void bone_children_clear_transflag(int mode, short around, ListBase *lb)
 
 /* sets transform flags in the bones
  * returns total number of bones with BONE_TRANSFORM */
-int count_set_pose_transflags(int *out_mode, short around, Object *ob)
+int count_set_pose_transflags(Object *ob, const int mode, short around, bool has_translate_rotate[2])
 {
 	bArmature *arm = ob->data;
 	bPoseChannel *pchan;
 	Bone *bone;
-	int mode = *out_mode;
 	int total = 0;
 
 	for (pchan = ob->pose->chanbase.first; pchan; pchan = pchan->next) {
@@ -781,43 +780,30 @@ int count_set_pose_transflags(int *out_mode, short around, Object *ob)
 		}
 	}
 	/* now count, and check if we have autoIK or have to switch from translate to rotate */
-	bool has_translation = false, has_rotation = false;
-
 	for (pchan = ob->pose->chanbase.first; pchan; pchan = pchan->next) {
 		bone = pchan->bone;
 		if (bone->flag & BONE_TRANSFORM) {
 			total++;
 
-			if (mode == TFM_TRANSLATION) {
+			if (has_translate_rotate != NULL) {
 				if (has_targetless_ik(pchan) == NULL) {
 					if (pchan->parent && (pchan->bone->flag & BONE_CONNECTED)) {
-						if (pchan->bone->flag & BONE_HINGE_CHILD_TRANSFORM)
-							has_translation = true;
+						if (pchan->bone->flag & BONE_HINGE_CHILD_TRANSFORM) {
+							has_translate_rotate[0] = true;
+						}
 					}
 					else {
-						if ((pchan->protectflag & OB_LOCK_LOC) != OB_LOCK_LOC)
-							has_translation = true;
+						if ((pchan->protectflag & OB_LOCK_LOC) != OB_LOCK_LOC) {
+							has_translate_rotate[0] = true;
+						}
+					}
+					if ((pchan->protectflag & OB_LOCK_ROT) != OB_LOCK_ROT) {
+						has_translate_rotate[1] = true;
 					}
-					if ((pchan->protectflag & OB_LOCK_ROT) != OB_LOCK_ROT)
-						has_rotation = true;
 				}
-				else
-					has_translation = true;
-			}
-		}
-	}
-
-	/* only modify transform mode if there are bones here that do something...
-	 * otherwise we get problems when multiple objects are selected
-	 */
-	if (total) {
-		/* if there are no translatable bones, do rotation */
-		if (mode == TFM_TRANSLATION && !has_translation) {
-			if (has_rotation) {
-				*out_mode = TFM_ROTATION;
-			}
-			else {
-				*out_mode = TFM_RESIZE;
+				else {
+					has_translate_rotate[1] = true;
+				}
 			}
 		}
 	}
@@ -1125,15 +1111,14 @@ static void createTransPose(TransInfo *t, Object **objects, uint objects_len)
 
 	t->data_len_all = 0;
 
+	bool has_translate_rotate_buf[2] = {false, false};
+	bool *has_translate_rotate = (t->mode == TFM_TRANSLATION) ? has_translate_rotate_buf : NULL;
+
 	FOREACH_TRANS_DATA_CONTAINER (t, tc) {
 		Object *ob = tc->poseobj;
 
 		bArmature *arm;
-		TransData *td;
-		TransDataExtension *tdx;
 		short ik_on = 0;
-		int i;
-
 
 		/* check validity of state */
 		arm = BKE_armature_from_object(tc->poseobj);
@@ -1155,11 +1140,29 @@ static void createTransPose(TransInfo *t, Object **objects, uint objects_len)
 		}
 
 		/* set flags and count total (warning, can change transform to rotate) */
-		tc->data_len = count_set_pose_transflags(&t->mode, t->around, ob);
+		tc->data_len = count_set_pose_transflags(ob, t->mode, t->around, has_translate_rotate);
+		/* len may be zero, skip next iteration. */
+	}
 
+	/* if there are no translatable bones, do rotation */
+	if ((t->mode == TFM_TRANSLATION) && !has_translate_rotate[0]) {
+		if (has_translate_rotate[1]) {
+			t->mode = TFM_ROTATION;
+		}
+		else {
+			t->mode = TFM_RESIZE;
+		}
+	}
+
+	FOREACH_TRANS_DATA_CONTAINER (t, tc) {
 		if (tc->data_len == 0) {
 			continue;
 		}
+		Object *ob = tc->poseobj;
+		TransData *td;
+		TransDataExtension *tdx;
+		short ik_on = 0;
+		int i;
 
 		tc->poseobj = ob; /* we also allow non-active objects to be transformed, in weightpaint */
 
@@ -6681,8 +6684,9 @@ void special_aftertrans_update(bContext *C, TransInfo *t)
 			}
 
 			/* set BONE_TRANSFORM flags for autokey, manipulator draw might have changed them */
-			if (!canceled && (t->mode != TFM_DUMMY))
-				count_set_pose_transflags(&t->mode, t->around, ob);
+			if (!canceled && (t->mode != TFM_DUMMY)) {
+				count_set_pose_transflags(ob, t->mode, t->around, NULL);
+			}
 
 			/* if target-less IK grabbing, we calculate the pchan transforms and clear flag */
 			if (!canceled && t->mode == TFM_TRANSLATION)

source/blender/editors/transform/transform_manipulator_3d.c

@@ -951,7 +951,7 @@ int ED_transform_calc_manipulator_stats(
 			}
 		}
 		else {
-			totsel = count_set_pose_transflags(&mode, 0, ob);
+			totsel = count_set_pose_transflags(ob, mode, V3D_AROUND_CENTER_BOUNDS, NULL);
 
 			if (totsel) {
 				/* use channels to get stats */