Static Override: add insertion for modifiers and one constraints, fix editing of inserted items in collections.

Now insertable collection items have a flag to say they are 'local' (and
hence can be freely edited).

source/blender/blenkernel/intern/constraint.c

@@ -4530,7 +4530,7 @@ static bConstraint *add_new_constraint_internal(const char *name, short type)
 
 	/* Set up a generic constraint datablock */
 	con->type = type;
-	con->flag |= CONSTRAINT_EXPAND;
+	con->flag |= CONSTRAINT_EXPAND | CONSTRAINT_STATICOVERRIDE_LOCAL;
 	con->enforce = 1.0f;
 
 	/* Determine a basic name, and info */

source/blender/blenkernel/intern/modifier.c

@@ -132,6 +132,7 @@ ModifierData *modifier_new(int type)
 
 	md->type = type;
 	md->mode = eModifierMode_Realtime | eModifierMode_Render | eModifierMode_Expanded;
+	md->flag = eModifierFlag_StaticOverride_Local;
 
 	if (mti->flags & eModifierTypeFlag_EnableInEditmode)
 		md->mode |= eModifierMode_Editmode;
@@ -311,6 +312,7 @@ void modifier_copyData_ex(ModifierData *md, ModifierData *target, const int flag
 	const ModifierTypeInfo *mti = modifierType_getInfo(md->type);
 
 	target->mode = md->mode;
+	target->flag = md->flag;
 
 	if (mti->copyData) {
 		mti->copyData(md, target);

source/blender/blenloader/intern/readfile.c

@@ -3391,6 +3391,11 @@ static void lib_link_constraints(FileData *fd, ID *id, ListBase *conlist)
 		}
 		/* own ipo, all constraints have it */
 		con->ipo = newlibadr_us(fd, id->lib, con->ipo); // XXX deprecated - old animation system
+
+		/* If linking from a library, clear 'local' static override flag. */
+		if (id->lib != NULL) {
+			con->flag &= ~CONSTRAINT_STATICOVERRIDE_LOCAL;
+		}
 	}
 	
 	/* relink all ID-blocks used by the constraints */
@@ -4784,6 +4789,14 @@ static void lib_link_modifiers__linkModifiers(
 static void lib_link_modifiers(FileData *fd, Object *ob)
 {
 	modifiers_foreachIDLink(ob, lib_link_modifiers__linkModifiers, fd);
+
+	/* If linking from a library, clear 'local' static override flag. */
+	if (ob->id.lib != NULL) {
+		for (ModifierData *mod = ob->modifiers.first; mod != NULL; mod = mod->next) {
+			mod->flag &= ~eModifierFlag_StaticOverride_Local;
+		}
+	}
+
 }
 
 static void lib_link_object(FileData *fd, Main *main)

source/blender/makesdna/DNA_constraint_types.h

@@ -526,6 +526,8 @@ typedef enum eBConstraint_Flags {
 	CONSTRAINT_OFF = (1<<9),
 		/* use bbone curve shape when calculating headtail values */
 	CONSTRAINT_BBONE_SHAPE = (1<<10),
+		/* That constraint has been inserted in local override (i.e. it can be fully edited!). */
+	CONSTRAINT_STATICOVERRIDE_LOCAL = (1 << 11),
 } eBConstraint_Flags;
 
 /* bConstraint->ownspace/tarspace */

source/blender/makesdna/DNA_modifier_types.h

@@ -105,7 +105,9 @@ typedef struct ModifierData {
 	struct ModifierData *next, *prev;
 
 	int type, mode;
-	int stackindex, pad;
+	int stackindex;
+	short flag;
+	short pad;
 	char name[64];  /* MAX_NAME */
 
 	/* XXX for timing info set by caller... solve later? (ton) */
@@ -114,6 +116,11 @@ typedef struct ModifierData {
 	char *error;
 } ModifierData;
 
+typedef enum {
+	/* This modifier has been inserted in local override, and hence can be fully edited. */
+	eModifierFlag_StaticOverride_Local  = (1 << 0),
+} ModifierFlag;
+
 typedef enum {
 	eSubsurfModifierFlag_Incremental  = (1 << 0),
 	eSubsurfModifierFlag_DebugIncr    = (1 << 1),

source/blender/makesrna/intern/rna_access.c

@@ -34,6 +34,8 @@
 
 #include "DNA_ID.h"
 #include "DNA_scene_types.h"
+#include "DNA_constraint_types.h"
+#include "DNA_modifier_types.h"
 #include "DNA_windowmanager_types.h"
 
 #include "BLI_blenlib.h"
@@ -1966,9 +1968,24 @@ bool RNA_property_animated(PointerRNA *ptr, PropertyRNA *prop)
 
 /** \note Does not take into account editable status, this has to be checked separately
  * (using RNA_property_edtiable_flag() usually). */
-bool RNA_property_overridable_get(PointerRNA *UNUSED(ptr), PropertyRNA *prop)
+bool RNA_property_overridable_get(PointerRNA *ptr, PropertyRNA *prop)
 {
 	if (prop->magic == RNA_MAGIC) {
+		/* Special handling for insertions of constraints or modifiers... */
+		/* TODO Note We may want to add a more generic system to RNA (like a special property in struct of items)
+		 * if we get more overrideable collections, for now we can live with those special-cases handling I think. */
+		if (RNA_struct_is_a(ptr->type, &RNA_Constraint)) {
+			bConstraint *con = ptr->data;
+			if (con->flag & CONSTRAINT_STATICOVERRIDE_LOCAL) {
+				return true;
+			}
+		}
+		else if (RNA_struct_is_a(ptr->type, &RNA_Modifier)) {
+			ModifierData *mod = ptr->data;
+			if (mod->flag & eModifierFlag_StaticOverride_Local) {
+				return true;
+			}
+		}
 		/* If this is a RNA-defined property (real or 'virtual' IDProp), we want to use RNA prop flag. */
 		return !(prop->flag & PROP_NO_COMPARISON) && (prop->flag & PROP_OVERRIDABLE_STATIC);
 	}

source/blender/makesrna/intern/rna_object.c

@@ -188,6 +188,7 @@ const EnumPropertyItem rna_enum_object_axis_items[] = {
 #include "BKE_object.h"
 #include "BKE_material.h"
 #include "BKE_mesh.h"
+#include "BKE_modifier.h"
 #include "BKE_particle.h"
 #include "BKE_scene.h"
 #include "BKE_deform.h"
@@ -1208,6 +1209,55 @@ static void rna_Object_modifier_clear(Object *object, bContext *C)
 	WM_main_add_notifier(NC_OBJECT | ND_MODIFIER | NA_REMOVED, object);
 }
 
+bool rna_Object_modifiers_override_apply(
+        PointerRNA *ptr_dst, PointerRNA *ptr_src, PointerRNA *UNUSED(ptr_storage),
+        PropertyRNA *UNUSED(prop_dst), PropertyRNA *UNUSED(prop_src), PropertyRNA *UNUSED(prop_storage),
+        const int UNUSED(len_dst), const int UNUSED(len_src), const int UNUSED(len_storage),
+        IDOverrideStaticPropertyOperation *opop)
+{
+	BLI_assert(opop->operation == IDOVERRIDESTATIC_OP_INSERT_AFTER &&
+	           "Unsupported RNA override operation on modifiers collection");
+
+	Object *ob_dst = (Object *)ptr_dst->id.data;
+	Object *ob_src = (Object *)ptr_src->id.data;
+
+	/* Remember that insertion operations are defined and stored in correct order, which means that
+	 * even if we insert several items in a row, we alays insert first one, then second one, etc.
+	 * So we should always find 'anchor' constraint in both _src *and* _dst> */
+	ModifierData *mod_anchor = NULL;
+	if (opop->subitem_local_name && opop->subitem_local_name[0]) {
+		mod_anchor = BLI_findstring(&ob_dst->modifiers, opop->subitem_local_name, offsetof(ModifierData, name));
+	}
+	if (mod_anchor == NULL && opop->subitem_local_index >= 0) {
+		mod_anchor = BLI_findlink(&ob_dst->modifiers, opop->subitem_local_index);
+	}
+	/* Otherwise we just insert in first position. */
+
+	ModifierData *mod_src = NULL;
+	if (opop->subitem_local_name && opop->subitem_local_name[0]) {
+		mod_src = BLI_findstring(&ob_src->modifiers, opop->subitem_local_name, offsetof(ModifierData, name));
+	}
+	if (mod_src == NULL && opop->subitem_local_index >= 0) {
+		mod_src = BLI_findlink(&ob_src->modifiers, opop->subitem_local_index);
+	}
+	mod_src = mod_src ? mod_src->next : ob_src->modifiers.first;
+
+	BLI_assert(mod_src != NULL);
+
+	ModifierData *mod_dst = modifier_new(mod_src->type);
+	modifier_copyData(mod_src, mod_dst);
+
+	/* This handles NULL anchor as expected by adding at head of list. */
+	BLI_insertlinkafter(&ob_dst->modifiers, mod_anchor, mod_dst);
+
+	/* This should actually *not* be needed in typical cases. However, if overridden source was edited,
+	 * we *may* have some new conflicting names. */
+	modifier_unique_name(&ob_dst->modifiers, mod_dst);
+
+//	printf("%s: We inserted a modifier...\n", __func__);
+	return true;
+}
+
 static void rna_Object_boundbox_get(PointerRNA *ptr, float *values)
 {
 	Object *ob = (Object *)ptr->id.data;
@@ -2116,6 +2166,7 @@ static void rna_def_object(BlenderRNA *brna)
 	prop = RNA_def_property(srna, "modifiers", PROP_COLLECTION, PROP_NONE);
 	RNA_def_property_struct_type(prop, "Modifier");
 	RNA_def_property_ui_text(prop, "Modifiers", "Modifiers affecting the geometric data of the object");
+	RNA_def_property_override_funcs(prop, NULL, NULL, "rna_Object_modifiers_override_apply");
 	RNA_def_property_flag(prop, PROP_OVERRIDABLE_STATIC | PROP_OVERRIDABLE_STATIC_INSERTION);
 	rna_def_object_modifiers(brna, prop);
 

source/blender/makesrna/intern/rna_pose.c

@@ -563,6 +563,54 @@ static void rna_PoseChannel_constraints_remove(ID *id, bPoseChannel *pchan, Repo
 	}
 }
 
+bool rna_PoseChannel_constraints_override_apply(
+        PointerRNA *ptr_dst, PointerRNA *ptr_src, PointerRNA *UNUSED(ptr_storage),
+        PropertyRNA *UNUSED(prop_dst), PropertyRNA *UNUSED(prop_src), PropertyRNA *UNUSED(prop_storage),
+        const int UNUSED(len_dst), const int UNUSED(len_src), const int UNUSED(len_storage),
+        IDOverrideStaticPropertyOperation *opop)
+{
+	BLI_assert(opop->operation == IDOVERRIDESTATIC_OP_INSERT_AFTER &&
+	           "Unsupported RNA override operation on constraints collection");
+
+	bPoseChannel *pchan_dst = (bPoseChannel *)ptr_dst->data;
+	bPoseChannel *pchan_src = (bPoseChannel *)ptr_src->data;
+
+	/* Remember that insertion operations are defined and stored in correct order, which means that
+	 * even if we insert several items in a row, we alays insert first one, then second one, etc.
+	 * So we should always find 'anchor' constraint in both _src *and* _dst> */
+	bConstraint *con_anchor = NULL;
+	if (opop->subitem_local_name && opop->subitem_local_name[0]) {
+		con_anchor = BLI_findstring(&pchan_dst->constraints, opop->subitem_local_name, offsetof(bConstraint, name));
+	}
+	if (con_anchor == NULL && opop->subitem_local_index >= 0) {
+		con_anchor = BLI_findlink(&pchan_dst->constraints, opop->subitem_local_index);
+	}
+	/* Otherwise we just insert in first position. */
+
+	bConstraint *con_src = NULL;
+	if (opop->subitem_local_name && opop->subitem_local_name[0]) {
+		con_src = BLI_findstring(&pchan_src->constraints, opop->subitem_local_name, offsetof(bConstraint, name));
+	}
+	if (con_src == NULL && opop->subitem_local_index >= 0) {
+		con_src = BLI_findlink(&pchan_src->constraints, opop->subitem_local_index);
+	}
+	con_src = con_src ? con_src->next : pchan_src->constraints.first;
+
+	BLI_assert(con_src != NULL);
+
+	bConstraint *con_dst = BKE_constraint_duplicate_ex(con_src, 0, true);
+
+	/* This handles NULL anchor as expected by adding at head of list. */
+	BLI_insertlinkafter(&pchan_dst->constraints, con_anchor, con_dst);
+
+	/* This should actually *not* be needed in typical cases. However, if overridden source was edited,
+	 * we *may* have some new conflicting names. */
+	BKE_constraint_unique_name(con_dst, &pchan_dst->constraints);
+
+//	printf("%s: We inserted a constraint...\n", __func__);
+	return true;
+}
+
 static int rna_PoseChannel_proxy_editable(PointerRNA *ptr, const char **r_info)
 {
 	Object *ob = (Object *)ptr->id.data;
@@ -808,6 +856,7 @@ static void rna_def_pose_channel(BlenderRNA *brna)
 	RNA_def_property_struct_type(prop, "Constraint");
 	RNA_def_property_flag(prop, PROP_OVERRIDABLE_STATIC | PROP_OVERRIDABLE_STATIC_INSERTION);
 	RNA_def_property_ui_text(prop, "Constraints", "Constraints that act on this PoseChannel");
+	RNA_def_property_override_funcs(prop, NULL, NULL, "rna_PoseChannel_constraints_override_apply");
 
 	rna_def_pose_channel_constraints(brna, prop);