/*************************************************************************/
/*  font_fb.h                                                            */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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/*************************************************************************/

#ifndef FONT_FALLBACK_H
#define FONT_FALLBACK_H

#include "servers/text_server.h"

struct FontDataFallback {
	Map<String, bool> lang_support_overrides;
	Map<String, bool> script_support_overrides;
	bool valid = false;
	int spacing_space = 0;
	int spacing_glyph = 0;

	virtual void clear_cache() = 0;

	virtual Error load_from_file(const String &p_filename, int p_base_size) { return ERR_CANT_CREATE; };
	virtual Error load_from_memory(const uint8_t *p_data, size_t p_size, int p_base_size) { return ERR_CANT_CREATE; };
	virtual Error bitmap_new(float p_height, float p_ascent, int p_base_size) { return ERR_CANT_CREATE; };

	virtual void bitmap_add_texture(const Ref<Texture> &p_texture) { ERR_FAIL_MSG("Not supported."); };
	virtual void bitmap_add_char(char32_t p_char, int p_texture_idx, const Rect2 &p_rect, const Size2 &p_align, float p_advance) { ERR_FAIL_MSG("Not supported."); };
	virtual void bitmap_add_kerning_pair(char32_t p_A, char32_t p_B, int p_kerning) { ERR_FAIL_MSG("Not supported."); };

	virtual float get_height(int p_size) const = 0;
	virtual float get_ascent(int p_size) const = 0;
	virtual float get_descent(int p_size) const = 0;

	virtual float get_underline_position(int p_size) const = 0;
	virtual float get_underline_thickness(int p_size) const = 0;

	virtual int get_spacing_space() const { return spacing_space; };
	virtual void set_spacing_space(int p_value) {
		spacing_space = p_value;
		clear_cache();
	};

	virtual int get_spacing_glyph() const { return spacing_glyph; };
	virtual void set_spacing_glyph(int p_value) {
		spacing_glyph = p_value;
		clear_cache();
	};

	virtual void set_antialiased(bool p_antialiased) = 0;
	virtual bool get_antialiased() const = 0;

	virtual void set_hinting(TextServer::Hinting p_hinting) = 0;
	virtual TextServer::Hinting get_hinting() const = 0;

	virtual void set_distance_field_hint(bool p_distance_field) = 0;
	virtual bool get_distance_field_hint() const = 0;

	virtual void set_force_autohinter(bool p_enabeld) = 0;
	virtual bool get_force_autohinter() const = 0;

	virtual bool has_outline() const = 0;
	virtual float get_base_size() const = 0;

	virtual bool has_char(char32_t p_char) const = 0;
	virtual String get_supported_chars() const = 0;

	virtual Vector2 get_advance(char32_t p_char, int p_size) const = 0;
	virtual Vector2 get_kerning(char32_t p_char, char32_t p_next, int p_size) const = 0;

	virtual Vector2 draw_glyph(RID p_canvas, int p_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color) const = 0;
	virtual Vector2 draw_glyph_outline(RID p_canvas, int p_size, int p_outline_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color) const = 0;

	virtual ~FontDataFallback(){};
};

#endif // FONT_FALLBACK_H