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diff --git a/scene/theme/theme_db.h b/scene/theme/theme_db.h
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+/*************************************************************************/
+/*  theme_db.h                                                           */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef THEME_DB_H
+#define THEME_DB_H
+
+#include "core/object/class_db.h"
+#include "core/object/ref_counted.h"
+
+class Font;
+class StyleBox;
+class Texture2D;
+class Theme;
+
+class ThemeDB : public Object {
+	GDCLASS(ThemeDB, Object);
+
+	static ThemeDB *singleton;
+
+	// Universal Theme resources used when no other theme has the item.
+	Ref<Theme> default_theme;
+	Ref<Theme> project_theme;
+
+	// Universal default values, final fallback for every theme.
+	float fallback_base_scale;
+	Ref<Font> fallback_font;
+	int fallback_font_size;
+	Ref<Texture2D> fallback_icon;
+	Ref<StyleBox> fallback_stylebox;
+
+protected:
+	static void _bind_methods();
+
+public:
+	void initialize_theme();
+	void initialize_theme_noproject();
+
+	// Universal Theme resources
+
+	void set_default_theme(const Ref<Theme> &p_default);
+	Ref<Theme> get_default_theme();
+
+	void set_project_theme(const Ref<Theme> &p_project_default);
+	Ref<Theme> get_project_theme();
+
+	// Universal default values.
+
+	void set_fallback_base_scale(float p_base_scale);
+	float get_fallback_base_scale();
+
+	void set_fallback_font(const Ref<Font> &p_font);
+	Ref<Font> get_fallback_font();
+
+	void set_fallback_font_size(int p_font_size);
+	int get_fallback_font_size();
+
+	void set_fallback_icon(const Ref<Texture2D> &p_icon);
+	Ref<Texture2D> get_fallback_icon();
+
+	void set_fallback_stylebox(const Ref<StyleBox> &p_stylebox);
+	Ref<StyleBox> get_fallback_stylebox();
+
+	static ThemeDB *get_singleton();
+	ThemeDB();
+	~ThemeDB();
+};
+
+#endif // THEME_DB_H