godot/modules/text_server_adv/text_server_adv.h

/*************************************************************************/
/*  text_server_adv.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 TEXT_SERVER_ADV_H
#define TEXT_SERVER_ADV_H

/*************************************************************************/
/* ICU/HarfBuzz/Graphite backed Text Server implementation with BiDi,    */
/* shaping and advanced font features support.                           */
/*************************************************************************/

#include "servers/text_server.h"

#include "core/templates/rid_owner.h"
#include "scene/resources/texture.h"
#include "script_iterator.h"

#include <unicode/ubidi.h>
#include <unicode/ubrk.h>
#include <unicode/uchar.h>
#include <unicode/uclean.h>
#include <unicode/udata.h>
#include <unicode/uiter.h>
#include <unicode/uloc.h>
#include <unicode/uscript.h>
#include <unicode/ustring.h>
#include <unicode/utypes.h>

#include <hb-icu.h>
#include <hb.h>

#include "font_adv.h"

class TextServerAdvanced : public TextServer {
	GDCLASS(TextServerAdvanced, TextServer);
	_THREAD_SAFE_CLASS_

	static String interface_name;
	static uint32_t interface_features;

	uint8_t *icu_data = nullptr;

	struct ShapedTextDataAdvanced : public ShapedTextData {
		/* Intermediate data */
		Char16String utf16;
		Vector<UBiDi *> bidi_iter;
		Vector<Vector2i> bidi_override;
		ScriptIterator *script_iter = nullptr;
		hb_buffer_t *hb_buffer = nullptr;

		~ShapedTextDataAdvanced() {
			for (int i = 0; i < bidi_iter.size(); i++) {
				ubidi_close(bidi_iter[i]);
			}
			if (script_iter) {
				memdelete(script_iter);
			}
			if (hb_buffer) {
				hb_buffer_destroy(hb_buffer);
			}
		}
	};

	float oversampling = 1.f;
	mutable RID_PtrOwner<FontDataAdvanced> font_owner;
	mutable RID_PtrOwner<ShapedTextDataAdvanced> shaped_owner;

	int _convert_pos(const ShapedTextDataAdvanced *p_sd, int p_pos) const;
	int _convert_pos_inv(const ShapedTextDataAdvanced *p_sd, int p_pos) const;
	void _shape_run(ShapedTextDataAdvanced *p_sd, int32_t p_start, int32_t p_end, hb_script_t p_script, hb_direction_t p_direction, Vector<RID> p_fonts, int p_span, int p_fb_index);
	TextServer::Glyph _shape_single_glyph(ShapedTextDataAdvanced *p_sd, char32_t p_char, hb_script_t p_script, hb_direction_t p_direction, RID p_font, int p_font_size);

protected:
	static void _bind_methods(){};

	void full_copy(ShapedTextDataAdvanced *p_shaped);
	void invalidate(ShapedTextDataAdvanced *p_shaped);

public:
	virtual bool has_feature(Feature p_feature) override;
	virtual String get_name() const override;

	virtual void free(RID p_rid) override;
	virtual bool has(RID p_rid) override;
	virtual bool load_support_data(const String &p_filename) override;

#ifdef TOOLS_ENABLED
	virtual String get_support_data_filename() override { return _MKSTR(ICU_DATA_NAME); };
	virtual String get_support_data_info() override { return String("ICU break iteration data (") + _MKSTR(ICU_DATA_NAME) + String(")."); };
	virtual bool save_support_data(const String &p_filename) override;
#endif

	virtual bool is_locale_right_to_left(const String &p_locale) override;

	virtual int32_t name_to_tag(const String &p_name) override;
	virtual String tag_to_name(int32_t p_tag) override;

	/* Font interface */
	virtual RID create_font_system(const String &p_name, int p_base_size = 16) override;
	virtual RID create_font_resource(const String &p_filename, int p_base_size = 16) override;
	virtual RID create_font_memory(const uint8_t *p_data, size_t p_size, const String &p_type, int p_base_size = 16) override;

	virtual float font_get_height(RID p_font, int p_size) const override;
	virtual float font_get_ascent(RID p_font, int p_size) const override;
	virtual float font_get_descent(RID p_font, int p_size) const override;

	virtual float font_get_underline_position(RID p_font, int p_size) const override;
	virtual float font_get_underline_thickness(RID p_font, int p_size) const override;

	virtual int font_get_spacing_space(RID p_font) const override;
	virtual void font_set_spacing_space(RID p_font, int p_value) override;

	virtual int font_get_spacing_glyph(RID p_font) const override;
	virtual void font_set_spacing_glyph(RID p_font, int p_value) override;

	virtual void font_set_antialiased(RID p_font, bool p_antialiased) override;
	virtual bool font_get_antialiased(RID p_font) const override;

	virtual Dictionary font_get_feature_list(RID p_font) const override;
	virtual Dictionary font_get_variation_list(RID p_font) const override;

	virtual void font_set_variation(RID p_font, const String &p_name, double p_value) override;
	virtual double font_get_variation(RID p_font, const String &p_name) const override;

	virtual void font_set_hinting(RID p_font, Hinting p_hinting) override;
	virtual Hinting font_get_hinting(RID p_font) const override;

	virtual void font_set_distance_field_hint(RID p_font, bool p_distance_field) override;
	virtual bool font_get_distance_field_hint(RID p_font) const override;

	virtual void font_set_force_autohinter(RID p_font, bool p_enabeld) override;
	virtual bool font_get_force_autohinter(RID p_font) const override;

	virtual bool font_has_char(RID p_font, char32_t p_char) const override;
	virtual String font_get_supported_chars(RID p_font) const override;

	virtual bool font_has_outline(RID p_font) const override;
	virtual float font_get_base_size(RID p_font) const override;

	virtual bool font_is_language_supported(RID p_font, const String &p_language) const override;
	virtual void font_set_language_support_override(RID p_font, const String &p_language, bool p_supported) override;
	virtual bool font_get_language_support_override(RID p_font, const String &p_language) override;
	virtual void font_remove_language_support_override(RID p_font, const String &p_language) override;
	Vector<String> font_get_language_support_overrides(RID p_font) override;

	virtual bool font_is_script_supported(RID p_font, const String &p_script) const override;
	virtual void font_set_script_support_override(RID p_font, const String &p_script, bool p_supported) override;
	virtual bool font_get_script_support_override(RID p_font, const String &p_script) override;
	virtual void font_remove_script_support_override(RID p_font, const String &p_script) override;
	Vector<String> font_get_script_support_overrides(RID p_font) override;

	virtual uint32_t font_get_glyph_index(RID p_font, char32_t p_char, char32_t p_variation_selector = 0x0000) const override;
	virtual Vector2 font_get_glyph_advance(RID p_font, uint32_t p_index, int p_size) const override;
	virtual Vector2 font_get_glyph_kerning(RID p_font, uint32_t p_index_a, uint32_t p_index_b, int p_size) const override;

	virtual Vector2 font_draw_glyph(RID p_font, RID p_canvas, int p_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color = Color(1, 1, 1)) const override;
	virtual Vector2 font_draw_glyph_outline(RID p_font, RID p_canvas, int p_size, int p_outline_size, const Vector2 &p_pos, uint32_t p_index, const Color &p_color = Color(1, 1, 1)) const override;

	virtual float font_get_oversampling() const override;
	virtual void font_set_oversampling(float p_oversampling) override;

	virtual Vector<String> get_system_fonts() const override;

	/* Shaped text buffer interface */

	virtual RID create_shaped_text(Direction p_direction = DIRECTION_AUTO, Orientation p_orientation = ORIENTATION_HORIZONTAL) override;

	virtual void shaped_text_clear(RID p_shaped) override;

	virtual void shaped_text_set_direction(RID p_shaped, Direction p_direction = DIRECTION_AUTO) override;
	virtual Direction shaped_text_get_direction(RID p_shaped) const override;

	virtual void shaped_text_set_bidi_override(RID p_shaped, const Vector<Vector2i> &p_override) override;

	virtual void shaped_text_set_orientation(RID p_shaped, Orientation p_orientation = ORIENTATION_HORIZONTAL) override;
	virtual Orientation shaped_text_get_orientation(RID p_shaped) const override;

	virtual void shaped_text_set_preserve_invalid(RID p_shaped, bool p_enabled) override;
	virtual bool shaped_text_get_preserve_invalid(RID p_shaped) const override;

	virtual void shaped_text_set_preserve_control(RID p_shaped, bool p_enabled) override;
	virtual bool shaped_text_get_preserve_control(RID p_shaped) const override;

	virtual bool shaped_text_add_string(RID p_shaped, const String &p_text, const Vector<RID> &p_fonts, int p_size, const Dictionary &p_opentype_features = Dictionary(), const String &p_language = "") override;
	virtual bool shaped_text_add_object(RID p_shaped, Variant p_key, const Size2 &p_size, VAlign p_inline_align = VALIGN_CENTER, int p_length = 1) override;
	virtual bool shaped_text_resize_object(RID p_shaped, Variant p_key, const Size2 &p_size, VAlign p_inline_align = VALIGN_CENTER) override;

	virtual RID shaped_text_substr(RID p_shaped, int p_start, int p_length) const override;
	virtual RID shaped_text_get_parent(RID p_shaped) const override;

	virtual float shaped_text_fit_to_width(RID p_shaped, float p_width, uint8_t /*JustificationFlag*/ p_jst_flags = JUSTIFICATION_WORD_BOUND | JUSTIFICATION_KASHIDA) override;
	virtual float shaped_text_tab_align(RID p_shaped, const Vector<float> &p_tab_stops) override;

	virtual bool shaped_text_shape(RID p_shaped) override;
	virtual bool shaped_text_update_breaks(RID p_shaped) override;
	virtual bool shaped_text_update_justification_ops(RID p_shaped) override;

	virtual bool shaped_text_is_ready(RID p_shaped) const override;

	virtual Vector<Glyph> shaped_text_get_glyphs(RID p_shaped) const override;

	virtual Vector2i shaped_text_get_range(RID p_shaped) const override;

	virtual Vector<Glyph> shaped_text_sort_logical(RID p_shaped) override;

	virtual Array shaped_text_get_objects(RID p_shaped) const override;
	virtual Rect2 shaped_text_get_object_rect(RID p_shaped, Variant p_key) const override;

	virtual Size2 shaped_text_get_size(RID p_shaped) const override;
	virtual float shaped_text_get_ascent(RID p_shaped) const override;
	virtual float shaped_text_get_descent(RID p_shaped) const override;
	virtual float shaped_text_get_width(RID p_shaped) const override;
	virtual float shaped_text_get_underline_position(RID p_shaped) const override;
	virtual float shaped_text_get_underline_thickness(RID p_shaped) const override;

	virtual String format_number(const String &p_string, const String &p_language = "") const override;
	virtual String parse_number(const String &p_string, const String &p_language = "") const override;
	virtual String percent_sign(const String &p_language = "") const override;

	static TextServer *create_func(Error &r_error, void *p_user_data);
	static void register_server();

	TextServerAdvanced();
	~TextServerAdvanced();
};

#endif // TEXT_SERVER_ADV_H