Add the base scale factor to the Theme resource

11 files changed, 305 insertions, 10 deletions

diff --git a/doc/classes/Control.xml b/doc/classes/Control.xml
index b00bf1c250..6fa59a15ac 100644
--- a/doc/classes/Control.xml
+++ b/doc/classes/Control.xml
@@ -458,6 +458,27 @@
 				See [method get_theme_color] for details.
 			</description>
 		</method>
+		<method name="get_theme_default_base_scale" qualifiers="const">
+			<return type="float" />
+			<description>
+				Returns the default base scale value from the first matching [Theme] in the tree if that [Theme] has a valid [member Theme.default_base_scale] value.
+				See [method get_theme_color] for details.
+			</description>
+		</method>
+		<method name="get_theme_default_font" qualifiers="const">
+			<return type="Font" />
+			<description>
+				Returns the default font from the first matching [Theme] in the tree if that [Theme] has a valid [member Theme.default_font] value.
+				See [method get_theme_color] for details.
+			</description>
+		</method>
+		<method name="get_theme_default_font_size" qualifiers="const">
+			<return type="int" />
+			<description>
+				Returns the default font size value from the first matching [Theme] in the tree if that [Theme] has a valid [member Theme.default_font_size] value.
+				See [method get_theme_color] for details.
+			</description>
+		</method>
 		<method name="get_theme_font" qualifiers="const">
 			<return type="Font" />
 			<argument index="0" name="name" type="StringName" />
diff --git a/doc/classes/Theme.xml b/doc/classes/Theme.xml
index edf5874432..2f5648dda9 100644
--- a/doc/classes/Theme.xml
+++ b/doc/classes/Theme.xml
@@ -273,6 +273,24 @@
 				Returns [code]false[/code] if the theme does not have [code]theme_type[/code].
 			</description>
 		</method>
+		<method name="has_default_base_scale" qualifiers="const">
+			<return type="bool" />
+			<description>
+				Returns [code]true[/code] if this theme has a valid [member default_base_scale] value.
+			</description>
+		</method>
+		<method name="has_default_font" qualifiers="const">
+			<return type="bool" />
+			<description>
+				Returns [code]true[/code] if this theme has a valid [member default_font] value.
+			</description>
+		</method>
+		<method name="has_default_font_size" qualifiers="const">
+			<return type="bool" />
+			<description>
+				Returns [code]true[/code] if this theme has a valid [member default_font_size] value.
+			</description>
+		</method>
 		<method name="has_font" qualifiers="const">
 			<return type="bool" />
 			<argument index="0" name="name" type="StringName" />
@@ -484,11 +502,17 @@
 		</method>
 	</methods>
 	<members>
+		<member name="default_base_scale" type="float" setter="set_default_base_scale" getter="get_default_base_scale" default="0.0">
+			The default base scale factor of this [Theme] resource. Used by some controls to scale their visual properties based on a global scale factor. If this value is set to [code]0.0[/code], the global scale factor is used.
+			Use [method has_default_base_scale] to check if this value is valid.
+		</member>
 		<member name="default_font" type="Font" setter="set_default_font" getter="get_default_font">
-			The theme's default font.
+			The default font of this [Theme] resource. Used as a fallback value for font items defined in this theme, but having invalid values. If this value is also invalid, the global default value is used.
+			Use [method has_default_font] to check if this value is valid.
 		</member>
 		<member name="default_font_size" type="int" setter="set_default_font_size" getter="get_default_font_size" default="-1">
-			The theme's default font size. Set to [code]-1[/code] to ignore and use global default.
+			The default font size of this [Theme] resource. Used as a fallback value for font size items defined in this theme, but having invalid values. If this value is set to [code]-1[/code], the global default value is used.
+			Use [method has_default_font_size] to check if this value is valid.
 		</member>
 	</members>
 	<constants>
diff --git a/doc/classes/Window.xml b/doc/classes/Window.xml
index 15d844aacb..0653c8b453 100644
--- a/doc/classes/Window.xml
+++ b/doc/classes/Window.xml
@@ -59,6 +59,21 @@
 			<description>
 			</description>
 		</method>
+		<method name="get_theme_default_base_scale" qualifiers="const">
+			<return type="float" />
+			<description>
+			</description>
+		</method>
+		<method name="get_theme_default_font" qualifiers="const">
+			<return type="Font" />
+			<description>
+			</description>
+		</method>
+		<method name="get_theme_default_font_size" qualifiers="const">
+			<return type="int" />
+			<description>
+			</description>
+		</method>
 		<method name="get_theme_font" qualifiers="const">
 			<return type="Font" />
 			<argument index="0" name="name" type="StringName" />
diff --git a/editor/editor_themes.cpp b/editor/editor_themes.cpp
index 0579fb4cbd..6efbcbc61e 100644
--- a/editor/editor_themes.cpp
+++ b/editor/editor_themes.cpp
@@ -292,7 +292,8 @@ void editor_register_and_generate_icons(Ref<Theme> p_theme, bool p_dark_theme =
 Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	Ref<Theme> theme = Ref<Theme>(memnew(Theme));
 
-	const float default_contrast = 0.3;
+	// Controls may rely on the scale for their internal drawing logic.
+	theme->set_default_theme_base_scale(EDSCALE);
 
 	// Theme settings
 	Color accent_color = EDITOR_GET("interface/theme/accent_color");
@@ -310,6 +311,8 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	Color preset_base_color;
 	float preset_contrast = 0;
 
+	const float default_contrast = 0.3;
+
 	// Please use alphabetical order if you're adding a new theme here
 	// (after "Custom")
 
diff --git a/scene/gui/control.cpp b/scene/gui/control.cpp
index 1b8b5e17ed..e2d3807b40 100644
--- a/scene/gui/control.cpp
+++ b/scene/gui/control.cpp
@@ -833,11 +833,12 @@ T Control::get_theme_item_in_types(Control *p_theme_owner, Window *p_theme_owner
 	ERR_FAIL_COND_V_MSG(p_theme_types.size() == 0, T(), "At least one theme type must be specified.");
 
 	// First, look through each control or window node in the branch, until no valid parent can be found.
-	// For each control iterate through its inheritance chain and see if p_name exists in any of them.
+	// Only nodes with a theme resource attached are considered.
 	Control *theme_owner = p_theme_owner;
 	Window *theme_owner_window = p_theme_owner_window;
 
 	while (theme_owner || theme_owner_window) {
+		// For each theme resource check the theme types provided and see if p_name exists with any of them.
 		for (const StringName &E : p_theme_types) {
 			if (theme_owner && theme_owner->data.theme->has_theme_item(p_data_type, p_name, E)) {
 				return theme_owner->data.theme->get_theme_item(p_data_type, p_name, E);
@@ -888,11 +889,12 @@ bool Control::has_theme_item_in_types(Control *p_theme_owner, Window *p_theme_ow
 	ERR_FAIL_COND_V_MSG(p_theme_types.size() == 0, false, "At least one theme type must be specified.");
 
 	// First, look through each control or window node in the branch, until no valid parent can be found.
-	// For each control iterate through its inheritance chain and see if p_name exists in any of them.
+	// Only nodes with a theme resource attached are considered.
 	Control *theme_owner = p_theme_owner;
 	Window *theme_owner_window = p_theme_owner_window;
 
 	while (theme_owner || theme_owner_window) {
+		// For each theme resource check the theme types provided and see if p_name exists with any of them.
 		for (const StringName &E : p_theme_types) {
 			if (theme_owner && theme_owner->data.theme->has_theme_item(p_data_type, p_name, E)) {
 				return true;
@@ -1130,6 +1132,150 @@ bool Control::has_theme_constant(const StringName &p_name, const StringName &p_t
 	return has_theme_item_in_types(data.theme_owner, data.theme_owner_window, Theme::DATA_TYPE_CONSTANT, p_name, theme_types);
 }
 
+float Control::fetch_theme_default_base_scale(Control *p_theme_owner, Window *p_theme_owner_window) {
+	// First, look through each control or window node in the branch, until no valid parent can be found.
+	// Only nodes with a theme resource attached are considered.
+	// For each theme resource see if their assigned theme has the default value defined and valid.
+	Control *theme_owner = p_theme_owner;
+	Window *theme_owner_window = p_theme_owner_window;
+
+	while (theme_owner || theme_owner_window) {
+		if (theme_owner && theme_owner->data.theme->has_default_theme_base_scale()) {
+			return theme_owner->data.theme->get_default_theme_base_scale();
+		}
+
+		if (theme_owner_window && theme_owner_window->theme->has_default_theme_base_scale()) {
+			return theme_owner_window->theme->get_default_theme_base_scale();
+		}
+
+		Node *parent = theme_owner ? theme_owner->get_parent() : theme_owner_window->get_parent();
+		Control *parent_c = Object::cast_to<Control>(parent);
+		if (parent_c) {
+			theme_owner = parent_c->data.theme_owner;
+			theme_owner_window = parent_c->data.theme_owner_window;
+		} else {
+			Window *parent_w = Object::cast_to<Window>(parent);
+			if (parent_w) {
+				theme_owner = parent_w->theme_owner;
+				theme_owner_window = parent_w->theme_owner_window;
+			} else {
+				theme_owner = nullptr;
+				theme_owner_window = nullptr;
+			}
+		}
+	}
+
+	// Secondly, check the project-defined Theme resource.
+	if (Theme::get_project_default().is_valid()) {
+		if (Theme::get_project_default()->has_default_theme_base_scale()) {
+			return Theme::get_project_default()->get_default_theme_base_scale();
+		}
+	}
+
+	// Lastly, fall back on the default Theme.
+	return Theme::get_default()->get_default_theme_base_scale();
+}
+
+float Control::get_theme_default_base_scale() const {
+	return fetch_theme_default_base_scale(data.theme_owner, data.theme_owner_window);
+}
+
+Ref<Font> Control::fetch_theme_default_font(Control *p_theme_owner, Window *p_theme_owner_window) {
+	// First, look through each control or window node in the branch, until no valid parent can be found.
+	// Only nodes with a theme resource attached are considered.
+	// For each theme resource see if their assigned theme has the default value defined and valid.
+	Control *theme_owner = p_theme_owner;
+	Window *theme_owner_window = p_theme_owner_window;
+
+	while (theme_owner || theme_owner_window) {
+		if (theme_owner && theme_owner->data.theme->has_default_theme_font()) {
+			return theme_owner->data.theme->get_default_theme_font();
+		}
+
+		if (theme_owner_window && theme_owner_window->theme->has_default_theme_font()) {
+			return theme_owner_window->theme->get_default_theme_font();
+		}
+
+		Node *parent = theme_owner ? theme_owner->get_parent() : theme_owner_window->get_parent();
+		Control *parent_c = Object::cast_to<Control>(parent);
+		if (parent_c) {
+			theme_owner = parent_c->data.theme_owner;
+			theme_owner_window = parent_c->data.theme_owner_window;
+		} else {
+			Window *parent_w = Object::cast_to<Window>(parent);
+			if (parent_w) {
+				theme_owner = parent_w->theme_owner;
+				theme_owner_window = parent_w->theme_owner_window;
+			} else {
+				theme_owner = nullptr;
+				theme_owner_window = nullptr;
+			}
+		}
+	}
+
+	// Secondly, check the project-defined Theme resource.
+	if (Theme::get_project_default().is_valid()) {
+		if (Theme::get_project_default()->has_default_theme_font()) {
+			return Theme::get_project_default()->get_default_theme_font();
+		}
+	}
+
+	// Lastly, fall back on the default Theme.
+	return Theme::get_default()->get_default_theme_font();
+}
+
+Ref<Font> Control::get_theme_default_font() const {
+	return fetch_theme_default_font(data.theme_owner, data.theme_owner_window);
+}
+
+int Control::fetch_theme_default_font_size(Control *p_theme_owner, Window *p_theme_owner_window) {
+	// First, look through each control or window node in the branch, until no valid parent can be found.
+	// Only nodes with a theme resource attached are considered.
+	// For each theme resource see if their assigned theme has the default value defined and valid.
+	Control *theme_owner = p_theme_owner;
+	Window *theme_owner_window = p_theme_owner_window;
+
+	while (theme_owner || theme_owner_window) {
+		if (theme_owner && theme_owner->data.theme->has_default_theme_font_size()) {
+			return theme_owner->data.theme->get_default_theme_font_size();
+		}
+
+		if (theme_owner_window && theme_owner_window->theme->has_default_theme_font_size()) {
+			return theme_owner_window->theme->get_default_theme_font_size();
+		}
+
+		Node *parent = theme_owner ? theme_owner->get_parent() : theme_owner_window->get_parent();
+		Control *parent_c = Object::cast_to<Control>(parent);
+		if (parent_c) {
+			theme_owner = parent_c->data.theme_owner;
+			theme_owner_window = parent_c->data.theme_owner_window;
+		} else {
+			Window *parent_w = Object::cast_to<Window>(parent);
+			if (parent_w) {
+				theme_owner = parent_w->theme_owner;
+				theme_owner_window = parent_w->theme_owner_window;
+			} else {
+				theme_owner = nullptr;
+				theme_owner_window = nullptr;
+			}
+		}
+	}
+
+	// Secondly, check the project-defined Theme resource.
+	if (Theme::get_project_default().is_valid()) {
+		if (Theme::get_project_default()->has_default_theme_font_size()) {
+			return Theme::get_project_default()->get_default_theme_font_size();
+		}
+	}
+
+	// Lastly, fall back on the default Theme.
+	return Theme::get_default()->get_default_theme_font_size();
+}
+
+int Control::get_theme_default_font_size() const {
+	return fetch_theme_default_font_size(data.theme_owner, data.theme_owner_window);
+}
+
 Rect2 Control::get_parent_anchorable_rect() const {
 	if (!is_inside_tree()) {
 		return Rect2();
@@ -2789,6 +2935,10 @@ void Control::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("has_theme_color", "name", "theme_type"), &Control::has_theme_color, DEFVAL(""));
 	ClassDB::bind_method(D_METHOD("has_theme_constant", "name", "theme_type"), &Control::has_theme_constant, DEFVAL(""));
 
+	ClassDB::bind_method(D_METHOD("get_theme_default_base_scale"), &Control::get_theme_default_base_scale);
+	ClassDB::bind_method(D_METHOD("get_theme_default_font"), &Control::get_theme_default_font);
+	ClassDB::bind_method(D_METHOD("get_theme_default_font_size"), &Control::get_theme_default_font_size);
+
 	ClassDB::bind_method(D_METHOD("get_parent_control"), &Control::get_parent_control);
 
 	ClassDB::bind_method(D_METHOD("set_h_grow_direction", "direction"), &Control::set_h_grow_direction);
diff --git a/scene/gui/control.h b/scene/gui/control.h
index 87ff3918cb..bdc06319ea 100644
--- a/scene/gui/control.h
+++ b/scene/gui/control.h
@@ -509,6 +509,14 @@ public:
 	bool has_theme_color(const StringName &p_name, const StringName &p_theme_type = StringName()) const;
 	bool has_theme_constant(const StringName &p_name, const StringName &p_theme_type = StringName()) const;
 
+	static float fetch_theme_default_base_scale(Control *p_theme_owner, Window *p_theme_owner_window);
+	static Ref<Font> fetch_theme_default_font(Control *p_theme_owner, Window *p_theme_owner_window);
+	static int fetch_theme_default_font_size(Control *p_theme_owner, Window *p_theme_owner_window);
+
+	float get_theme_default_base_scale() const;
+	Ref<Font> get_theme_default_font() const;
+	int get_theme_default_font_size() const;
+
 	/* TOOLTIP */
 
 	void set_tooltip(const String &p_tooltip);
diff --git a/scene/main/window.cpp b/scene/main/window.cpp
index ca5a3915d0..a0f62c853f 100644
--- a/scene/main/window.cpp
+++ b/scene/main/window.cpp
@@ -1266,6 +1266,18 @@ bool Window::has_theme_constant(const StringName &p_name, const StringName &p_th
 	return Control::has_theme_item_in_types(theme_owner, theme_owner_window, Theme::DATA_TYPE_CONSTANT, p_name, theme_types);
 }
 
+float Window::get_theme_default_base_scale() const {
+	return Control::fetch_theme_default_base_scale(theme_owner, theme_owner_window);
+}
+
+Ref<Font> Window::get_theme_default_font() const {
+	return Control::fetch_theme_default_font(theme_owner, theme_owner_window);
+}
+
+int Window::get_theme_default_font_size() const {
+	return Control::fetch_theme_default_font_size(theme_owner, theme_owner_window);
+}
+
 Rect2i Window::get_parent_rect() const {
 	ERR_FAIL_COND_V(!is_inside_tree(), Rect2i());
 	if (is_embedded()) {
@@ -1480,6 +1492,10 @@ void Window::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("has_theme_color", "name", "theme_type"), &Window::has_theme_color, DEFVAL(""));
 	ClassDB::bind_method(D_METHOD("has_theme_constant", "name", "theme_type"), &Window::has_theme_constant, DEFVAL(""));
 
+	ClassDB::bind_method(D_METHOD("get_theme_default_base_scale"), &Window::get_theme_default_base_scale);
+	ClassDB::bind_method(D_METHOD("get_theme_default_font"), &Window::get_theme_default_font);
+	ClassDB::bind_method(D_METHOD("get_theme_default_font_size"), &Window::get_theme_default_font_size);
+
 	ClassDB::bind_method(D_METHOD("set_layout_direction", "direction"), &Window::set_layout_direction);
 	ClassDB::bind_method(D_METHOD("get_layout_direction"), &Window::get_layout_direction);
 	ClassDB::bind_method(D_METHOD("is_layout_rtl"), &Window::is_layout_rtl);
diff --git a/scene/main/window.h b/scene/main/window.h
index 4f31d9cd1f..def6eab7b8 100644
--- a/scene/main/window.h
+++ b/scene/main/window.h
@@ -280,6 +280,10 @@ public:
 	bool has_theme_color(const StringName &p_name, const StringName &p_theme_type = StringName()) const;
 	bool has_theme_constant(const StringName &p_name, const StringName &p_theme_type = StringName()) const;
 
+	float get_theme_default_base_scale() const;
+	Ref<Font> get_theme_default_font() const;
+	int get_theme_default_font_size() const;
+
 	Rect2i get_parent_rect() const;
 	virtual DisplayServer::WindowID get_window_id() const override;
 
diff --git a/scene/resources/default_theme/default_theme.cpp b/scene/resources/default_theme/default_theme.cpp
index 94cf826477..54bb7a82cf 100644
--- a/scene/resources/default_theme/default_theme.cpp
+++ b/scene/resources/default_theme/default_theme.cpp
@@ -1036,9 +1036,16 @@ void make_default_theme(bool p_hidpi, Ref<Font> p_font) {
 	}
 
 	Ref<Font> large_font = default_font;
-	fill_default_theme(t, default_font, large_font, default_icon, default_style, p_hidpi ? 2.0 : 1.0);
+
+	float default_scale = 1.0;
+	if (p_hidpi) {
+		default_scale = 2.0;
+	}
+
+	fill_default_theme(t, default_font, large_font, default_icon, default_style, default_scale);
 
 	Theme::set_default(t);
+	Theme::set_default_base_scale(default_scale);
 	Theme::set_default_icon(default_icon);
 	Theme::set_default_style(default_style);
 	Theme::set_default_font(default_font);
diff --git a/scene/resources/theme.cpp b/scene/resources/theme.cpp
index dab08d48c2..dd5f0b9c6c 100644
--- a/scene/resources/theme.cpp
+++ b/scene/resources/theme.cpp
@@ -36,6 +36,7 @@ Ref<Theme> Theme::default_theme;
 Ref<Theme> Theme::project_default_theme;
 
 // Universal default values, final fallback for every theme.
+float Theme::default_base_scale = 1.0;
 Ref<Texture2D> Theme::default_icon;
 Ref<StyleBox> Theme::default_style;
 Ref<Font> Theme::default_font;
@@ -219,6 +220,10 @@ void Theme::set_project_default(const Ref<Theme> &p_project_default) {
 }
 
 // Universal fallback values for theme item types.
+void Theme::set_default_base_scale(float p_base_scale) {
+	default_base_scale = p_base_scale;
+}
+
 void Theme::set_default_icon(const Ref<Texture2D> &p_icon) {
 	default_icon = p_icon;
 }
@@ -236,6 +241,24 @@ void Theme::set_default_font_size(int p_font_size) {
 }
 
 // Fallback values for theme item types, configurable per theme.
+void Theme::set_default_theme_base_scale(float p_base_scale) {
+	if (default_theme_base_scale == p_base_scale) {
+		return;
+	}
+
+	default_theme_base_scale = p_base_scale;
+
+	_emit_theme_changed();
+}
+
+float Theme::get_default_theme_base_scale() const {
+	return default_theme_base_scale;
+}
+
+bool Theme::has_default_theme_base_scale() const {
+	return default_theme_base_scale > 0.0;
+}
+
 void Theme::set_default_theme_font(const Ref<Font> &p_default_font) {
 	if (default_theme_font == p_default_font) {
 		return;
@@ -258,6 +281,10 @@ Ref<Font> Theme::get_default_theme_font() const {
 	return default_theme_font;
 }
 
+bool Theme::has_default_theme_font() const {
+	return default_theme_font.is_valid();
+}
+
 void Theme::set_default_theme_font_size(int p_font_size) {
 	if (default_theme_font_size == p_font_size) {
 		return;
@@ -272,6 +299,10 @@ int Theme::get_default_theme_font_size() const {
 	return default_theme_font_size;
 }
 
+bool Theme::has_default_theme_font_size() const {
+	return default_theme_font_size > 0;
+}
+
 // Icons.
 void Theme::set_icon(const StringName &p_name, const StringName &p_theme_type, const Ref<Texture2D> &p_icon) {
 	if (icon_map[p_theme_type].has(p_name) && icon_map[p_theme_type][p_name].is_valid()) {
@@ -460,7 +491,7 @@ void Theme::set_font(const StringName &p_name, const StringName &p_theme_type, c
 Ref<Font> Theme::get_font(const StringName &p_name, const StringName &p_theme_type) const {
 	if (font_map.has(p_theme_type) && font_map[p_theme_type].has(p_name) && font_map[p_theme_type][p_name].is_valid()) {
 		return font_map[p_theme_type][p_name];
-	} else if (default_theme_font.is_valid()) {
+	} else if (has_default_theme_font()) {
 		return default_theme_font;
 	} else {
 		return default_font;
@@ -468,7 +499,7 @@ Ref<Font> Theme::get_font(const StringName &p_name, const StringName &p_theme_ty
 }
 
 bool Theme::has_font(const StringName &p_name, const StringName &p_theme_type) const {
-	return ((font_map.has(p_theme_type) && font_map[p_theme_type].has(p_name) && font_map[p_theme_type][p_name].is_valid()) || default_theme_font.is_valid());
+	return ((font_map.has(p_theme_type) && font_map[p_theme_type].has(p_name) && font_map[p_theme_type][p_name].is_valid()) || has_default_theme_font());
 }
 
 bool Theme::has_font_nocheck(const StringName &p_name, const StringName &p_theme_type) const {
@@ -539,7 +570,7 @@ void Theme::set_font_size(const StringName &p_name, const StringName &p_theme_ty
 int Theme::get_font_size(const StringName &p_name, const StringName &p_theme_type) const {
 	if (font_size_map.has(p_theme_type) && font_size_map[p_theme_type].has(p_name) && (font_size_map[p_theme_type][p_name] > 0)) {
 		return font_size_map[p_theme_type][p_name];
-	} else if (default_theme_font_size > 0) {
+	} else if (has_default_theme_font_size()) {
 		return default_theme_font_size;
 	} else {
 		return default_font_size;
@@ -547,7 +578,7 @@ int Theme::get_font_size(const StringName &p_name, const StringName &p_theme_typ
 }
 
 bool Theme::has_font_size(const StringName &p_name, const StringName &p_theme_type) const {
-	return ((font_size_map.has(p_theme_type) && font_size_map[p_theme_type].has(p_name) && (font_size_map[p_theme_type][p_name] > 0)) || (default_theme_font_size > 0));
+	return ((font_size_map.has(p_theme_type) && font_size_map[p_theme_type].has(p_name) && (font_size_map[p_theme_type][p_name] > 0)) || has_default_theme_font_size());
 }
 
 bool Theme::has_font_size_nocheck(const StringName &p_name, const StringName &p_theme_type) const {
@@ -1580,11 +1611,17 @@ void Theme::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("get_constant_list", "theme_type"), &Theme::_get_constant_list);
 	ClassDB::bind_method(D_METHOD("get_constant_type_list"), &Theme::_get_constant_type_list);
 
+	ClassDB::bind_method(D_METHOD("set_default_base_scale", "font_size"), &Theme::set_default_theme_base_scale);
+	ClassDB::bind_method(D_METHOD("get_default_base_scale"), &Theme::get_default_theme_base_scale);
+	ClassDB::bind_method(D_METHOD("has_default_base_scale"), &Theme::has_default_theme_base_scale);
+
 	ClassDB::bind_method(D_METHOD("set_default_font", "font"), &Theme::set_default_theme_font);
 	ClassDB::bind_method(D_METHOD("get_default_font"), &Theme::get_default_theme_font);
+	ClassDB::bind_method(D_METHOD("has_default_font"), &Theme::has_default_theme_font);
 
 	ClassDB::bind_method(D_METHOD("set_default_font_size", "font_size"), &Theme::set_default_theme_font_size);
 	ClassDB::bind_method(D_METHOD("get_default_font_size"), &Theme::get_default_theme_font_size);
+	ClassDB::bind_method(D_METHOD("has_default_font_size"), &Theme::has_default_theme_font_size);
 
 	ClassDB::bind_method(D_METHOD("set_theme_item", "data_type", "name", "theme_type", "value"), &Theme::set_theme_item);
 	ClassDB::bind_method(D_METHOD("get_theme_item", "data_type", "name", "theme_type"), &Theme::get_theme_item);
@@ -1605,6 +1642,7 @@ void Theme::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("merge_with", "other"), &Theme::merge_with);
 	ClassDB::bind_method(D_METHOD("clear"), &Theme::clear);
 
+	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "default_base_scale", PROPERTY_HINT_RANGE, "0.0,2.0,0.01,or_greater"), "set_default_base_scale", "get_default_base_scale");
 	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "default_font", PROPERTY_HINT_RESOURCE_TYPE, "Font"), "set_default_font", "get_default_font");
 	ADD_PROPERTY(PropertyInfo(Variant::INT, "default_font_size"), "set_default_font_size", "get_default_font_size");
 
diff --git a/scene/resources/theme.h b/scene/resources/theme.h
index 35e466f899..50466d99c2 100644
--- a/scene/resources/theme.h
+++ b/scene/resources/theme.h
@@ -101,12 +101,14 @@ protected:
 	static Ref<Theme> project_default_theme;
 
 	// Universal default values, final fallback for every theme.
+	static float default_base_scale;
 	static Ref<Texture2D> default_icon;
 	static Ref<StyleBox> default_style;
 	static Ref<Font> default_font;
 	static int default_font_size;
 
 	// Default values configurable for each individual theme.
+	float default_theme_base_scale = 0.0;
 	Ref<Font> default_theme_font;
 	int default_theme_font_size = -1;
 
@@ -124,16 +126,23 @@ public:
 	static Ref<Theme> get_project_default();
 	static void set_project_default(const Ref<Theme> &p_project_default);
 
+	static void set_default_base_scale(float p_base_scale);
 	static void set_default_icon(const Ref<Texture2D> &p_icon);
 	static void set_default_style(const Ref<StyleBox> &p_style);
 	static void set_default_font(const Ref<Font> &p_font);
 	static void set_default_font_size(int p_font_size);
 
+	void set_default_theme_base_scale(float p_base_scale);
+	float get_default_theme_base_scale() const;
+	bool has_default_theme_base_scale() const;
+
 	void set_default_theme_font(const Ref<Font> &p_default_font);
 	Ref<Font> get_default_theme_font() const;
+	bool has_default_theme_font() const;
 
 	void set_default_theme_font_size(int p_font_size);
 	int get_default_theme_font_size() const;
+	bool has_default_theme_font_size() const;
 
 	void set_icon(const StringName &p_name, const StringName &p_theme_type, const Ref<Texture2D> &p_icon);
 	Ref<Texture2D> get_icon(const StringName &p_name, const StringName &p_theme_type) const;