Merge pull request #4233 from pewpew-game/displayio-group-list

displayio: make Group use a python list internally

8 files changed, 192 insertions, 138 deletions

diff --git a/ports/atmel-samd/boards/ugame10/mpconfigboard.mk b/ports/atmel-samd/boards/ugame10/mpconfigboard.mk
index f7214704c..2b0eedc01 100644
--- a/ports/atmel-samd/boards/ugame10/mpconfigboard.mk
+++ b/ports/atmel-samd/boards/ugame10/mpconfigboard.mk
@@ -18,6 +18,7 @@ CIRCUITPY_ANALOGIO = 1
 CIRCUITPY_GAMEPAD = 1
 CIRCUITPY_DISPLAYIO = 1
 
+CIRCUITPY_PULSEIO = 0
 CIRCUITPY_AUDIOBUSIO = 0
 CIRCUITPY_BITBANGIO = 0
 CIRCUITPY_BITMAPTOOLS = 0
diff --git a/py/objlist.c b/py/objlist.c
index 51ec920be..7aa4ee89c 100644
--- a/py/objlist.c
+++ b/py/objlist.c
@@ -270,13 +270,10 @@ STATIC mp_obj_t list_extend(mp_obj_t self_in, mp_obj_t arg_in) {
     return mp_const_none; // return None, as per CPython
 }
 
-STATIC mp_obj_t list_pop(size_t n_args, const mp_obj_t *args) {
-    mp_check_self(MP_OBJ_IS_TYPE(args[0], &mp_type_list));
-    mp_obj_list_t *self = mp_instance_cast_to_native_base(args[0], &mp_type_list);
+inline mp_obj_t mp_obj_list_pop(mp_obj_list_t *self, size_t index) {
     if (self->len == 0) {
         mp_raise_IndexError_varg(translate("pop from empty %q"), MP_QSTR_list);
     }
-    size_t index = mp_get_index(self->base.type, self->len, n_args == 1 ? MP_OBJ_NEW_SMALL_INT(-1) : args[1], false);
     mp_obj_t ret = self->items[index];
     self->len -= 1;
     memmove(self->items + index, self->items + index + 1, (self->len - index) * sizeof(mp_obj_t));
@@ -289,6 +286,13 @@ STATIC mp_obj_t list_pop(size_t n_args, const mp_obj_t *args) {
     return ret;
 }
 
+STATIC mp_obj_t list_pop(size_t n_args, const mp_obj_t *args) {
+    mp_check_self(MP_OBJ_IS_TYPE(args[0], &mp_type_list));
+    mp_obj_list_t *self = mp_instance_cast_to_native_base(args[0], &mp_type_list);
+    size_t index = mp_get_index(self->base.type, self->len, n_args == 1 ? MP_OBJ_NEW_SMALL_INT(-1) : args[1], false);
+    return mp_obj_list_pop(self, index);
+}
+
 STATIC void mp_quicksort(mp_obj_t *head, mp_obj_t *tail, mp_obj_t key_fn, mp_obj_t binop_less_result) {
     MP_STACK_CHECK();
     while (head < tail) {
@@ -371,6 +375,15 @@ STATIC mp_obj_t list_index(size_t n_args, const mp_obj_t *args) {
     return mp_seq_index_obj(self->items, self->len, n_args, args);
 }
 
+inline void mp_obj_list_insert(mp_obj_list_t *self, size_t index, mp_obj_t obj) {
+    mp_obj_list_append(MP_OBJ_FROM_PTR(self), mp_const_none);
+
+    for (size_t i = self->len - 1; i > index; --i) {
+         self->items[i] = self->items[i - 1];
+    }
+    self->items[index] = obj;
+}
+
 STATIC mp_obj_t list_insert(mp_obj_t self_in, mp_obj_t idx, mp_obj_t obj) {
     mp_check_self(MP_OBJ_IS_TYPE(self_in, &mp_type_list));
     mp_obj_list_t *self = mp_instance_cast_to_native_base(self_in, &mp_type_list);
@@ -385,14 +398,7 @@ STATIC mp_obj_t list_insert(mp_obj_t self_in, mp_obj_t idx, mp_obj_t obj) {
     if ((size_t)index > self->len) {
          index = self->len;
     }
-
-    mp_obj_list_append(self_in, mp_const_none);
-
-    for (mp_int_t i = self->len-1; i > index; i--) {
-         self->items[i] = self->items[i-1];
-    }
-    self->items[index] = obj;
-
+    mp_obj_list_insert(self, index, obj);
     return mp_const_none;
 }
 
diff --git a/py/objlist.h b/py/objlist.h
index f02030557..eb005e81c 100644
--- a/py/objlist.h
+++ b/py/objlist.h
@@ -36,5 +36,7 @@ typedef struct _mp_obj_list_t {
 } mp_obj_list_t;
 
 void mp_obj_list_init(mp_obj_list_t *o, size_t n);
+mp_obj_t mp_obj_list_pop(mp_obj_list_t *self, size_t index);
+void mp_obj_list_insert(mp_obj_list_t *self, size_t index, mp_obj_t obj);
 
 #endif // MICROPY_INCLUDED_PY_OBJLIST_H
diff --git a/shared-bindings/displayio/Group.c b/shared-bindings/displayio/Group.c
index 386e270ab..c1c05504d 100644
--- a/shared-bindings/displayio/Group.c
+++ b/shared-bindings/displayio/Group.c
@@ -42,7 +42,7 @@
 //|         """Create a Group of a given size and scale. Scale is in one dimension. For example, scale=2
 //|         leads to a layer's pixel being 2x2 pixels when in the group.
 //|
-//|         :param int max_size: The maximum group size.
+//|         :param int max_size: Ignored. Will be removed in 7.x.
 //|         :param int scale: Scale of layer pixels in one dimension.
 //|         :param int x: Initial x position within the parent.
 //|         :param int y: Initial y position within the parent."""
@@ -59,11 +59,6 @@ STATIC mp_obj_t displayio_group_make_new(const mp_obj_type_t *type, size_t n_arg
     mp_arg_val_t args[MP_ARRAY_SIZE(allowed_args)];
     mp_arg_parse_all(n_args, pos_args, kw_args, MP_ARRAY_SIZE(allowed_args), allowed_args, args);
 
-    mp_int_t max_size = args[ARG_max_size].u_int;
-    if (max_size < 1) {
-        mp_raise_ValueError_varg(translate("%q must be >= 1"), MP_QSTR_max_size);
-    }
-
     mp_int_t scale = args[ARG_scale].u_int;
     if (scale < 1) {
         mp_raise_ValueError_varg(translate("%q must be >= 1"), MP_QSTR_scale);
@@ -71,7 +66,7 @@ STATIC mp_obj_t displayio_group_make_new(const mp_obj_type_t *type, size_t n_arg
 
     displayio_group_t *self = m_new_obj(displayio_group_t);
     self->base.type = &displayio_group_type;
-    common_hal_displayio_group_construct(self, max_size, scale, args[ARG_x].u_int, args[ARG_y].u_int);
+    common_hal_displayio_group_construct(self, scale, args[ARG_x].u_int, args[ARG_y].u_int);
 
     return MP_OBJ_FROM_PTR(self);
 }
@@ -328,6 +323,21 @@ STATIC mp_obj_t group_subscr(mp_obj_t self_in, mp_obj_t index_obj, mp_obj_t valu
     return mp_const_none;
 }
 
+//|     def sort(self, key: function, reverse: bool) -> None:
+//|         """Sort the members of the group."""
+//|         ...
+//|
+STATIC mp_obj_t displayio_group_obj_sort(size_t n_args, const mp_obj_t *pos_args, mp_map_t *kw_args) {
+    displayio_group_t *self = native_group(pos_args[0]);
+    mp_obj_t *args = m_new(mp_obj_t, n_args);
+    for (size_t i = 1; i < n_args; ++i) {
+        args[i] = pos_args[i];
+    }
+    args[0] = MP_OBJ_FROM_PTR(self->members);
+    return mp_obj_list_sort(n_args, pos_args, kw_args);
+}
+MP_DEFINE_CONST_FUN_OBJ_KW(displayio_group_sort_obj, 1, displayio_group_obj_sort);
+
 STATIC const mp_rom_map_elem_t displayio_group_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_hidden), MP_ROM_PTR(&displayio_group_hidden_obj) },
     { MP_ROM_QSTR(MP_QSTR_scale), MP_ROM_PTR(&displayio_group_scale_obj) },
@@ -338,6 +348,7 @@ STATIC const mp_rom_map_elem_t displayio_group_locals_dict_table[] = {
     { MP_ROM_QSTR(MP_QSTR_index), MP_ROM_PTR(&displayio_group_index_obj) },
     { MP_ROM_QSTR(MP_QSTR_pop), MP_ROM_PTR(&displayio_group_pop_obj) },
     { MP_ROM_QSTR(MP_QSTR_remove), MP_ROM_PTR(&displayio_group_remove_obj) },
+    { MP_ROM_QSTR(MP_QSTR_sort), MP_ROM_PTR(&displayio_group_sort_obj) },
 };
 STATIC MP_DEFINE_CONST_DICT(displayio_group_locals_dict, displayio_group_locals_dict_table);
 
diff --git a/shared-bindings/displayio/Group.h b/shared-bindings/displayio/Group.h
index 942a207f2..69c73bf4d 100644
--- a/shared-bindings/displayio/Group.h
+++ b/shared-bindings/displayio/Group.h
@@ -33,7 +33,7 @@ extern const mp_obj_type_t displayio_group_type;
 
 displayio_group_t* native_group(mp_obj_t group_obj);
 
-void common_hal_displayio_group_construct(displayio_group_t* self, uint32_t max_size, uint32_t scale, mp_int_t x, mp_int_t y);
+void common_hal_displayio_group_construct(displayio_group_t* self, uint32_t scale, mp_int_t x, mp_int_t y);
 uint32_t common_hal_displayio_group_get_scale(displayio_group_t* self);
 void common_hal_displayio_group_set_scale(displayio_group_t* self, uint32_t scale);
 bool common_hal_displayio_group_get_hidden(displayio_group_t* self);
diff --git a/shared-module/displayio/Group.c b/shared-module/displayio/Group.c
index 15cf5b8e4..42efeb18c 100644
--- a/shared-module/displayio/Group.c
+++ b/shared-module/displayio/Group.c
@@ -27,6 +27,7 @@
 #include "shared-bindings/displayio/Group.h"
 
 #include "py/runtime.h"
+#include "py/objlist.h"
 #include "shared-bindings/displayio/TileGrid.h"
 
 #if CIRCUITPY_VECTORIO
@@ -34,9 +35,9 @@
 #endif
 
 
-void common_hal_displayio_group_construct(displayio_group_t* self, uint32_t max_size, uint32_t scale, mp_int_t x, mp_int_t y) {
-    displayio_group_child_t* children = m_new(displayio_group_child_t, max_size);
-    displayio_group_construct(self, children, max_size, scale, x, y);
+void common_hal_displayio_group_construct(displayio_group_t* self, uint32_t scale, mp_int_t x, mp_int_t y) {
+    mp_obj_list_t *members = mp_obj_new_list(0, NULL);
+    displayio_group_construct(self, members, scale, x, y);
 }
 
 bool common_hal_displayio_group_get_hidden(displayio_group_t* self) {
@@ -51,12 +52,19 @@ void common_hal_displayio_group_set_hidden(displayio_group_t* self, bool hidden)
     if (self->hidden_by_parent) {
         return;
     }
-    for (size_t i = 0; i < self->size; i++) {
-        mp_obj_t layer = self->children[i].native;
-        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+    for (size_t i = 0; i < self->members->len; i++) {
+        mp_obj_t layer;
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_tilegrid_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_tilegrid_set_hidden_by_parent(layer, hidden);
-        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            continue;
+        }
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_group_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_group_set_hidden_by_parent(layer, hidden);
+            continue;
         }
     }
 }
@@ -70,12 +78,19 @@ void displayio_group_set_hidden_by_parent(displayio_group_t *self, bool hidden)
     if (self->hidden) {
         return;
     }
-    for (size_t i = 0; i < self->size; i++) {
-        mp_obj_t layer = self->children[i].native;
-        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+    for (size_t i = 0; i < self->members->len; i++) {
+        mp_obj_t layer;
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_tilegrid_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_tilegrid_set_hidden_by_parent(layer, hidden);
-        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            continue;
+        }
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_group_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_group_set_hidden_by_parent(layer, hidden);
+            continue;
         }
     }
 }
@@ -86,16 +101,22 @@ uint32_t common_hal_displayio_group_get_scale(displayio_group_t* self) {
 
 bool displayio_group_get_previous_area(displayio_group_t *self, displayio_area_t* area) {
     bool first = true;
-    for (size_t i = 0; i < self->size; i++) {
-        mp_obj_t layer = self->children[i].native;
+    for (size_t i = 0; i < self->members->len; i++) {
+        mp_obj_t layer;
         displayio_area_t layer_area;
-        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_tilegrid_type);
+        if (layer != MP_OBJ_NULL) {
             if (!displayio_tilegrid_get_previous_area(layer, &layer_area)) {
                 continue;
             }
-        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
-            if (!displayio_group_get_previous_area(layer, &layer_area)) {
-                continue;
+        } else {
+            layer = mp_instance_cast_to_native_base(
+                self->members->items[i], &displayio_group_type);
+            if (layer != MP_OBJ_NULL) {
+                if (!displayio_group_get_previous_area(layer, &layer_area)) {
+                    continue;
+                }
             }
         }
         if (first) {
@@ -120,18 +141,27 @@ static void _update_child_transforms(displayio_group_t* self) {
     if (!self->in_group) {
         return;
     }
-    for (size_t i = 0; i < self->size; i++) {
-        mp_obj_t layer = self->children[i].native;
+    for (size_t i = 0; i < self->members->len; i++) {
+        mp_obj_t layer;
 #if CIRCUITPY_VECTORIO
-        if (MP_OBJ_IS_TYPE(layer, &vectorio_vector_shape_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &vectorio_vector_shape_type);
+        if (layer != MP_OBJ_NULL) {
             vectorio_vector_shape_update_transform(layer, &self->absolute_transform);
+            continue;
         }
-        else
 #endif
-        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_tilegrid_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_tilegrid_update_transform(layer, &self->absolute_transform);
-        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            continue;
+        }
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_group_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_group_update_transform(layer, &self->absolute_transform);
+            continue;
         }
     }
 }
@@ -210,21 +240,17 @@ void common_hal_displayio_group_set_y(displayio_group_t* self, mp_int_t y) {
     _update_child_transforms(self);
 }
 
-static mp_obj_t _add_layer(displayio_group_t* self, mp_obj_t layer) {
+static void _add_layer(displayio_group_t* self, mp_obj_t layer) {
     mp_obj_t native_layer;
 #if CIRCUITPY_VECTORIO
     native_layer = mp_instance_cast_to_native_base(layer, &vectorio_vector_shape_type);
     if (native_layer != MP_OBJ_NULL) {
         vectorio_vector_shape_update_transform(native_layer, &self->absolute_transform);
-        return native_layer;
+        return;
     }
 #endif
-    native_layer = mp_instance_cast_to_native_base(layer, &displayio_group_type);
-    if (native_layer == MP_OBJ_NULL) {
-        native_layer = mp_instance_cast_to_native_base(layer, &displayio_tilegrid_type);
-        if (native_layer == MP_OBJ_NULL) {
-            mp_raise_ValueError(translate("Layer must be a Group or TileGrid subclass."));
-        }
+    native_layer = mp_instance_cast_to_native_base(layer, &displayio_tilegrid_type);
+    if (native_layer != MP_OBJ_NULL) {
         displayio_tilegrid_t* tilegrid = native_layer;
         if (tilegrid->in_group) {
             mp_raise_ValueError(translate("Layer already in a group."));
@@ -232,7 +258,10 @@ static mp_obj_t _add_layer(displayio_group_t* self, mp_obj_t layer) {
             tilegrid->in_group = true;
         }
         displayio_tilegrid_update_transform(tilegrid, &self->absolute_transform);
-    } else {
+        return;
+    }
+    native_layer = mp_instance_cast_to_native_base(layer, &displayio_group_type);
+    if (native_layer != MP_OBJ_NULL) {
         displayio_group_t* group = native_layer;
         if (group->in_group) {
             mp_raise_ValueError(translate("Layer already in a group."));
@@ -240,27 +269,34 @@ static mp_obj_t _add_layer(displayio_group_t* self, mp_obj_t layer) {
             group->in_group = true;
         }
         displayio_group_update_transform(group, &self->absolute_transform);
+        return;
     }
-    return native_layer;
+    mp_raise_ValueError(translate("Layer must be a Group or TileGrid subclass."));
 }
 
 static void _remove_layer(displayio_group_t* self, size_t index) {
-    mp_obj_t layer = self->children[index].native;
+    mp_obj_t layer;
     displayio_area_t layer_area;
     bool rendered_last_frame = false;
 #if CIRCUITPY_VECTORIO
-    if (MP_OBJ_IS_TYPE(layer, &vectorio_vector_shape_type)) {
+    layer = mp_instance_cast_to_native_base(
+        self->members->items[index], &vectorio_vector_shape_type);
+    if (layer != MP_OBJ_NULL) {
         bool has_dirty_area = vectorio_vector_shape_get_dirty_area(layer, &layer_area);
         rendered_last_frame = has_dirty_area;
         vectorio_vector_shape_update_transform(layer, NULL);
     }
-    else
 #endif
-    if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+    layer = mp_instance_cast_to_native_base(
+        self->members->items[index], &displayio_tilegrid_type);
+    if (layer != MP_OBJ_NULL) {
         displayio_tilegrid_t* tilegrid = layer;
         rendered_last_frame = displayio_tilegrid_get_previous_area(tilegrid, &layer_area);
         displayio_tilegrid_update_transform(tilegrid, NULL);
-    } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+    }
+    layer = mp_instance_cast_to_native_base(
+        self->members->items[index], &displayio_group_type);
+    if (layer != MP_OBJ_NULL) {
         displayio_group_t* group = layer;
         rendered_last_frame = displayio_group_get_previous_area(group, &layer_area);
         displayio_group_update_transform(group, NULL);
@@ -277,62 +313,40 @@ static void _remove_layer(displayio_group_t* self, size_t index) {
 }
 
 void common_hal_displayio_group_insert(displayio_group_t* self, size_t index, mp_obj_t layer) {
-    if (self->size == self->max_size) {
-        mp_raise_RuntimeError(translate("Group full"));
-    }
-    mp_obj_t native_layer = _add_layer(self, layer);
-    // Shift everything right.
-    for (size_t i = self->size; i > index; i--) {
-        self->children[i] = self->children[i - 1];
-    }
-    self->children[index].native = native_layer;
-    self->children[index].original = layer;
-    self->size++;
+    _add_layer(self, layer);
+    mp_obj_list_insert(self->members, index, layer);
 }
 
 mp_obj_t common_hal_displayio_group_pop(displayio_group_t* self, size_t index) {
-    self->size--;
-    mp_obj_t item = self->children[index].original;
     _remove_layer(self, index);
-
-    // Shift everything left.
-    for (size_t i = index; i < self->size; i++) {
-        self->children[i] = self->children[i + 1];
-    }
-    self->children[self->size].native = NULL;
-    self->children[self->size].original = NULL;
-    return item;
+    return mp_obj_list_pop(self->members, index);
 }
 
 mp_int_t common_hal_displayio_group_index(displayio_group_t* self, mp_obj_t layer) {
-    for (size_t i = 0; i < self->size; i++) {
-        if (self->children[i].original == layer) {
-            return i;
-        }
-    }
-    return -1;
+    mp_obj_t args[] = {self->members, layer};
+    mp_obj_t *index = mp_seq_index_obj(
+        self->members->items, self->members->len, 2, args);
+    return MP_OBJ_SMALL_INT_VALUE(index);
 }
 
 size_t common_hal_displayio_group_get_len(displayio_group_t* self) {
-    return self->size;
+    return self->members->len;
 }
 
 mp_obj_t common_hal_displayio_group_get(displayio_group_t* self, size_t index) {
-    return self->children[index].original;
+    return self->members->items[index];
 }
 
 void common_hal_displayio_group_set(displayio_group_t* self, size_t index, mp_obj_t layer) {
-    mp_obj_t native_layer = _add_layer(self, layer);
+    _add_layer(self, layer);
     _remove_layer(self, index);
-    self->children[index].native = native_layer;
-    self->children[index].original = layer;
+    mp_obj_list_store(self, MP_OBJ_NEW_SMALL_INT(index), layer);
 }
 
-void displayio_group_construct(displayio_group_t* self, displayio_group_child_t* child_array, uint32_t max_size, uint32_t scale, mp_int_t x, mp_int_t y) {
+void displayio_group_construct(displayio_group_t* self, mp_obj_list_t* members, uint32_t scale, mp_int_t x, mp_int_t y) {
     self->x = x;
     self->y = y;
-    self->children = child_array;
-    self->max_size = max_size;
+    self->members = members;
     self->item_removed = false;
     self->scale = scale;
     self->in_group = false;
@@ -341,47 +355,61 @@ void displayio_group_construct(displayio_group_t* self, displayio_group_child_t*
 bool displayio_group_fill_area(displayio_group_t *self, const _displayio_colorspace_t* colorspace, const displayio_area_t* area, uint32_t* mask, uint32_t* buffer) {
     // Track if any of the layers finishes filling in the given area. We can ignore any remaining
     // layers at that point.
-    bool full_coverage = false;
-    for (int32_t i = self->size - 1; i >= 0 ; i--) {
-        mp_obj_t layer = self->children[i].native;
+    for (int32_t i = self->members->len - 1; i >= 0 ; i--) {
+        mp_obj_t layer;
 #if CIRCUITPY_VECTORIO
-        if (MP_OBJ_IS_TYPE(layer, &vectorio_vector_shape_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &vectorio_vector_shape_type);
+        if (layer != MP_OBJ_NULL) {
             if (vectorio_vector_shape_fill_area(layer, colorspace, area, mask, buffer)) {
-                full_coverage = true;
-                break;
+                return true;
             }
+            continue;
         }
-        else
 #endif
-        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_tilegrid_type);
+        if (layer != MP_OBJ_NULL) {
             if (displayio_tilegrid_fill_area(layer, colorspace, area, mask, buffer)) {
-                full_coverage = true;
-                break;
+                return true;
             }
-        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            continue;
+        }
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_group_type);
+        if (layer != MP_OBJ_NULL) {
             if (displayio_group_fill_area(layer, colorspace, area, mask, buffer)) {
-                full_coverage = true;
-                break;
+                return true;
             }
+            continue;
         }
     }
-    return full_coverage;
+    return false;
 }
 
 void displayio_group_finish_refresh(displayio_group_t *self) {
     self->item_removed = false;
-    for (int32_t i = self->size - 1; i >= 0 ; i--) {
-        mp_obj_t layer = self->children[i].native;
+    for (int32_t i = self->members->len - 1; i >= 0 ; i--) {
+        mp_obj_t layer;
 #if CIRCUITPY_VECTORIO
-        if (MP_OBJ_IS_TYPE(layer, &vectorio_vector_shape_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &vectorio_vector_shape_type);
+        if (layer != MP_OBJ_NULL) {
             vectorio_vector_shape_finish_refresh(layer);
+            continue;
         }
-        else
 #endif
-        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_tilegrid_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_tilegrid_finish_refresh(layer);
-        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            continue;
+        }
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_group_type);
+        if (layer != MP_OBJ_NULL) {
             displayio_group_finish_refresh(layer);
+            continue;
         }
     }
 }
@@ -392,18 +420,27 @@ displayio_area_t* displayio_group_get_refresh_areas(displayio_group_t *self, dis
         tail = &self->dirty_area;
     }
 
-    for (int32_t i = self->size - 1; i >= 0 ; i--) {
-        mp_obj_t layer = self->children[i].native;
+    for (int32_t i = self->members->len - 1; i >= 0 ; i--) {
+        mp_obj_t layer;
 #if CIRCUITPY_VECTORIO
-        if (MP_OBJ_IS_TYPE(layer, &vectorio_vector_shape_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &vectorio_vector_shape_type);
+        if (layer != MP_OBJ_NULL) {
             tail = vectorio_vector_shape_get_refresh_areas(layer, tail);
+            continue;
         }
-        else
 #endif
-        if (MP_OBJ_IS_TYPE(layer, &displayio_tilegrid_type)) {
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_tilegrid_type);
+        if (layer != MP_OBJ_NULL) {
             tail = displayio_tilegrid_get_refresh_areas(layer, tail);
-        } else if (MP_OBJ_IS_TYPE(layer, &displayio_group_type)) {
+            continue;
+        }
+        layer = mp_instance_cast_to_native_base(
+            self->members->items[i], &displayio_group_type);
+        if (layer != MP_OBJ_NULL) {
             tail = displayio_group_get_refresh_areas(layer, tail);
+            continue;
         }
     }
 
diff --git a/shared-module/displayio/Group.h b/shared-module/displayio/Group.h
index 5afaac1ba..0964e0a0b 100644
--- a/shared-module/displayio/Group.h
+++ b/shared-module/displayio/Group.h
@@ -31,24 +31,18 @@
 #include <stdint.h>
 
 #include "py/obj.h"
+#include "py/objlist.h"
 #include "shared-module/displayio/area.h"
 #include "shared-module/displayio/Palette.h"
 
 typedef struct {
-    mp_obj_t native;
-    mp_obj_t original;
-} displayio_group_child_t;
-
-typedef struct {
     mp_obj_base_t base;
-    displayio_group_child_t* children;
+    mp_obj_list_t *members;
     displayio_buffer_transform_t absolute_transform;
     displayio_area_t dirty_area; // Catch all for changed area
     int16_t x;
     int16_t y;
     uint16_t scale;
-    uint16_t size;
-    uint16_t max_size;
     bool item_removed :1;
     bool in_group :1;
     bool hidden :1;
@@ -56,7 +50,7 @@ typedef struct {
     uint8_t padding :4;
 } displayio_group_t;
 
-void displayio_group_construct(displayio_group_t* self, displayio_group_child_t* child_array, uint32_t max_size, uint32_t scale, mp_int_t x, mp_int_t y);
+void displayio_group_construct(displayio_group_t* self, mp_obj_list_t* members, uint32_t scale, mp_int_t x, mp_int_t y);
 void displayio_group_set_hidden_by_parent(displayio_group_t *self, bool hidden);
 bool displayio_group_get_previous_area(displayio_group_t *group, displayio_area_t* area);
 bool displayio_group_fill_area(displayio_group_t *group, const _displayio_colorspace_t* colorspace, const displayio_area_t* area, uint32_t* mask, uint32_t *buffer);
diff --git a/supervisor/shared/display.c b/supervisor/shared/display.c
index 9c9c66cd7..1919cf4a4 100644
--- a/supervisor/shared/display.c
+++ b/supervisor/shared/display.c
@@ -270,15 +270,20 @@ displayio_tilegrid_t blinka_sprite = {
 };
 
 #if CIRCUITPY_TERMINALIO
-#define CHILD_COUNT 2
-displayio_group_child_t splash_children[2] = {
-    {&blinka_sprite, &blinka_sprite},
-    {&supervisor_terminal_text_grid, &supervisor_terminal_text_grid}
+mp_obj_t members[] = { &blinka_sprite, &supervisor_terminal_text_grid, };
+mp_obj_list_t splash_children = {
+    .base = {.type = &mp_type_list },
+    .alloc = 2,
+    .len = 2,
+    .items = members,
 };
 #else
-#define CHILD_COUNT 1
-displayio_group_child_t splash_children[1] = {
-    {&blinka_sprite, &blinka_sprite},
+mp_obj_t members[] = { &blinka_sprite };
+mp_obj_list_t splash_children = {
+    .base = {.type = &mp_type_list },
+    .alloc = 1,
+    .len = 1,
+    .items = members,
 };
 #endif
 
@@ -287,9 +292,7 @@ displayio_group_t circuitpython_splash = {
     .x = 0,
     .y = 0,
     .scale = 2,
-    .size = CHILD_COUNT,
-    .max_size = CHILD_COUNT,
-    .children = splash_children,
+    .members = &splash_children,
     .item_removed = false,
     .in_group = false,
     .hidden = false,