/*************************************************************************/
/*  label.cpp                                                            */
/*************************************************************************/
/*                       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.                */
/*************************************************************************/

#include "label.h"

#include "core/config/project_settings.h"
#include "core/core_string_names.h"
#include "core/string/print_string.h"
#include "core/string/translation.h"

#include "servers/text_server.h"

void Label::set_autowrap_mode(TextServer::AutowrapMode p_mode) {
	if (autowrap_mode == p_mode) {
		return;
	}

	autowrap_mode = p_mode;
	lines_dirty = true;
	queue_redraw();

	if (clip || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) {
		update_minimum_size();
	}
}

TextServer::AutowrapMode Label::get_autowrap_mode() const {
	return autowrap_mode;
}

void Label::set_uppercase(bool p_uppercase) {
	if (uppercase == p_uppercase) {
		return;
	}

	uppercase = p_uppercase;
	dirty = true;

	queue_redraw();
}

bool Label::is_uppercase() const {
	return uppercase;
}

int Label::get_line_height(int p_line) const {
	Ref<Font> font = (settings.is_valid() && settings->get_font().is_valid()) ? settings->get_font() : theme_cache.font;
	if (p_line >= 0 && p_line < lines_rid.size()) {
		return TS->shaped_text_get_size(lines_rid[p_line]).y;
	} else if (lines_rid.size() > 0) {
		int h = 0;
		for (int i = 0; i < lines_rid.size(); i++) {
			h = MAX(h, TS->shaped_text_get_size(lines_rid[i]).y);
		}
		return h;
	} else {
		int font_size = settings.is_valid() ? settings->get_font_size() : theme_cache.font_size;
		return font->get_height(font_size);
	}
}

void Label::_shape() {
	Ref<StyleBox> style = theme_cache.normal_style;
	int width = (get_size().width - style->get_minimum_size().width);

	if (dirty || font_dirty) {
		if (dirty) {
			TS->shaped_text_clear(text_rid);
		}
		if (text_direction == Control::TEXT_DIRECTION_INHERITED) {
			TS->shaped_text_set_direction(text_rid, is_layout_rtl() ? TextServer::DIRECTION_RTL : TextServer::DIRECTION_LTR);
		} else {
			TS->shaped_text_set_direction(text_rid, (TextServer::Direction)text_direction);
		}
		const Ref<Font> &font = (settings.is_valid() && settings->get_font().is_valid()) ? settings->get_font() : theme_cache.font;
		int font_size = settings.is_valid() ? settings->get_font_size() : theme_cache.font_size;
		ERR_FAIL_COND(font.is_null());
		String txt = (uppercase) ? TS->string_to_upper(xl_text, language) : xl_text;
		if (visible_chars >= 0 && visible_chars_behavior == TextServer::VC_CHARS_BEFORE_SHAPING) {
			txt = txt.substr(0, visible_chars);
		}
		if (dirty) {
			TS->shaped_text_add_string(text_rid, txt, font->get_rids(), font_size, font->get_opentype_features(), language);
		} else {
			int spans = TS->shaped_get_span_count(text_rid);
			for (int i = 0; i < spans; i++) {
				TS->shaped_set_span_update_font(text_rid, i, font->get_rids(), font_size, font->get_opentype_features());
			}
		}
		for (int i = 0; i < TextServer::SPACING_MAX; i++) {
			TS->shaped_text_set_spacing(text_rid, TextServer::SpacingType(i), font->get_spacing(TextServer::SpacingType(i)));
		}
		TS->shaped_text_set_bidi_override(text_rid, structured_text_parser(st_parser, st_args, txt));
		dirty = false;
		font_dirty = false;
		lines_dirty = true;
	}

	if (lines_dirty) {
		for (int i = 0; i < lines_rid.size(); i++) {
			TS->free_rid(lines_rid[i]);
		}
		lines_rid.clear();

		BitField<TextServer::LineBreakFlag> autowrap_flags = TextServer::BREAK_MANDATORY;
		switch (autowrap_mode) {
			case TextServer::AUTOWRAP_WORD_SMART:
				autowrap_flags = TextServer::BREAK_WORD_BOUND | TextServer::BREAK_ADAPTIVE | TextServer::BREAK_MANDATORY;
				break;
			case TextServer::AUTOWRAP_WORD:
				autowrap_flags = TextServer::BREAK_WORD_BOUND | TextServer::BREAK_MANDATORY;
				break;
			case TextServer::AUTOWRAP_ARBITRARY:
				autowrap_flags = TextServer::BREAK_GRAPHEME_BOUND | TextServer::BREAK_MANDATORY;
				break;
			case TextServer::AUTOWRAP_OFF:
				break;
		}
		autowrap_flags = autowrap_flags | TextServer::BREAK_TRIM_EDGE_SPACES;

		PackedInt32Array line_breaks = TS->shaped_text_get_line_breaks(text_rid, width, 0, autowrap_flags);
		for (int i = 0; i < line_breaks.size(); i = i + 2) {
			RID line = TS->shaped_text_substr(text_rid, line_breaks[i], line_breaks[i + 1] - line_breaks[i]);
			lines_rid.push_back(line);
		}
	}

	if (xl_text.length() == 0) {
		minsize = Size2(1, get_line_height());
		return;
	}

	if (autowrap_mode == TextServer::AUTOWRAP_OFF) {
		minsize.width = 0.0f;
		for (int i = 0; i < lines_rid.size(); i++) {
			if (minsize.width < TS->shaped_text_get_size(lines_rid[i]).x) {
				minsize.width = TS->shaped_text_get_size(lines_rid[i]).x;
			}
		}
	}

	if (lines_dirty) {
		BitField<TextServer::TextOverrunFlag> overrun_flags = TextServer::OVERRUN_NO_TRIM;
		switch (overrun_behavior) {
			case TextServer::OVERRUN_TRIM_WORD_ELLIPSIS:
				overrun_flags.set_flag(TextServer::OVERRUN_TRIM);
				overrun_flags.set_flag(TextServer::OVERRUN_TRIM_WORD_ONLY);
				overrun_flags.set_flag(TextServer::OVERRUN_ADD_ELLIPSIS);
				break;
			case TextServer::OVERRUN_TRIM_ELLIPSIS:
				overrun_flags.set_flag(TextServer::OVERRUN_TRIM);
				overrun_flags.set_flag(TextServer::OVERRUN_ADD_ELLIPSIS);
				break;
			case TextServer::OVERRUN_TRIM_WORD:
				overrun_flags.set_flag(TextServer::OVERRUN_TRIM);
				overrun_flags.set_flag(TextServer::OVERRUN_TRIM_WORD_ONLY);
				break;
			case TextServer::OVERRUN_TRIM_CHAR:
				overrun_flags.set_flag(TextServer::OVERRUN_TRIM);
				break;
			case TextServer::OVERRUN_NO_TRIMMING:
				break;
		}

		// Fill after min_size calculation.

		if (autowrap_mode != TextServer::AUTOWRAP_OFF) {
			int visible_lines = get_visible_line_count();
			bool lines_hidden = visible_lines > 0 && visible_lines < lines_rid.size();
			if (lines_hidden) {
				overrun_flags.set_flag(TextServer::OVERRUN_ENFORCE_ELLIPSIS);
			}
			if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL) {
				for (int i = 0; i < lines_rid.size(); i++) {
					if (i < visible_lines - 1 || lines_rid.size() == 1) {
						TS->shaped_text_fit_to_width(lines_rid[i], width);
					} else if (i == (visible_lines - 1)) {
						TS->shaped_text_overrun_trim_to_width(lines_rid[visible_lines - 1], width, overrun_flags);
					}
				}
			} else if (lines_hidden) {
				TS->shaped_text_overrun_trim_to_width(lines_rid[visible_lines - 1], width, overrun_flags);
			}
		} else {
			// Autowrap disabled.
			for (int i = 0; i < lines_rid.size(); i++) {
				if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL) {
					TS->shaped_text_fit_to_width(lines_rid[i], width);
					overrun_flags.set_flag(TextServer::OVERRUN_JUSTIFICATION_AWARE);
					TS->shaped_text_overrun_trim_to_width(lines_rid[i], width, overrun_flags);
					TS->shaped_text_fit_to_width(lines_rid[i], width, TextServer::JUSTIFICATION_WORD_BOUND | TextServer::JUSTIFICATION_KASHIDA | TextServer::JUSTIFICATION_CONSTRAIN_ELLIPSIS);
				} else {
					TS->shaped_text_overrun_trim_to_width(lines_rid[i], width, overrun_flags);
				}
			}
		}
		lines_dirty = false;
	}

	_update_visible();

	if (autowrap_mode == TextServer::AUTOWRAP_OFF || !clip || overrun_behavior == TextServer::OVERRUN_NO_TRIMMING) {
		update_minimum_size();
	}
}

void Label::_update_visible() {
	int line_spacing = settings.is_valid() ? settings->get_line_spacing() : theme_cache.line_spacing;
	Ref<StyleBox> style = theme_cache.normal_style;
	int lines_visible = lines_rid.size();

	if (max_lines_visible >= 0 && lines_visible > max_lines_visible) {
		lines_visible = max_lines_visible;
	}

	minsize.height = 0;
	int last_line = MIN(lines_rid.size(), lines_visible + lines_skipped);
	for (int64_t i = lines_skipped; i < last_line; i++) {
		minsize.height += TS->shaped_text_get_size(lines_rid[i]).y + line_spacing;
		if (minsize.height > (get_size().height - style->get_minimum_size().height + line_spacing)) {
			break;
		}
	}
}

inline void draw_glyph(const Glyph &p_gl, const RID &p_canvas, const Color &p_font_color, const Vector2 &p_ofs) {
	if (p_gl.font_rid != RID()) {
		TS->font_draw_glyph(p_gl.font_rid, p_canvas, p_gl.font_size, p_ofs + Vector2(p_gl.x_off, p_gl.y_off), p_gl.index, p_font_color);
	} else {
		TS->draw_hex_code_box(p_canvas, p_gl.font_size, p_ofs + Vector2(p_gl.x_off, p_gl.y_off), p_gl.index, p_font_color);
	}
}

inline void draw_glyph_outline(const Glyph &p_gl, const RID &p_canvas, const Color &p_font_color, const Color &p_font_shadow_color, const Color &p_font_outline_color, const int &p_shadow_outline_size, const int &p_outline_size, const Vector2 &p_ofs, const Vector2 &shadow_ofs) {
	if (p_gl.font_rid != RID()) {
		if (p_font_shadow_color.a > 0) {
			TS->font_draw_glyph(p_gl.font_rid, p_canvas, p_gl.font_size, p_ofs + Vector2(p_gl.x_off, p_gl.y_off) + shadow_ofs, p_gl.index, p_font_shadow_color);
		}
		if (p_font_shadow_color.a > 0 && p_shadow_outline_size > 0) {
			TS->font_draw_glyph_outline(p_gl.font_rid, p_canvas, p_gl.font_size, p_shadow_outline_size, p_ofs + Vector2(p_gl.x_off, p_gl.y_off) + shadow_ofs, p_gl.index, p_font_shadow_color);
		}
		if (p_font_outline_color.a != 0.0 && p_outline_size > 0) {
			TS->font_draw_glyph_outline(p_gl.font_rid, p_canvas, p_gl.font_size, p_outline_size, p_ofs + Vector2(p_gl.x_off, p_gl.y_off), p_gl.index, p_font_outline_color);
		}
	}
}

void Label::_update_theme_item_cache() {
	Control::_update_theme_item_cache();

	theme_cache.normal_style = get_theme_stylebox(SNAME("normal"));
	theme_cache.font = get_theme_font(SNAME("font"));

	theme_cache.font_size = get_theme_font_size(SNAME("font_size"));
	theme_cache.line_spacing = get_theme_constant(SNAME("line_spacing"));
	theme_cache.font_color = get_theme_color(SNAME("font_color"));
	theme_cache.font_shadow_color = get_theme_color(SNAME("font_shadow_color"));
	theme_cache.font_shadow_offset = Point2(get_theme_constant(SNAME("shadow_offset_x")), get_theme_constant(SNAME("shadow_offset_y")));
	theme_cache.font_outline_color = get_theme_color(SNAME("font_outline_color"));
	theme_cache.font_outline_size = get_theme_constant(SNAME("outline_size"));
	theme_cache.font_shadow_outline_size = get_theme_constant(SNAME("shadow_outline_size"));
}

PackedStringArray Label::get_configuration_warnings() const {
	PackedStringArray warnings = Control::get_configuration_warnings();

	// Ensure that the font can render all of the required glyphs.
	Ref<Font> font;
	if (settings.is_valid()) {
		font = settings->get_font();
	}
	if (font.is_null()) {
		font = theme_cache.font;
	}

	if (font.is_valid()) {
		if (dirty || font_dirty || lines_dirty) {
			const_cast<Label *>(this)->_shape();
		}

		const Glyph *glyph = TS->shaped_text_get_glyphs(text_rid);
		int64_t glyph_count = TS->shaped_text_get_glyph_count(text_rid);
		for (int64_t i = 0; i < glyph_count; i++) {
			if (glyph[i].font_rid == RID()) {
				warnings.push_back(RTR("The current font does not support rendering one or more characters used in this Label's text."));
				break;
			}
		}
	}

	return warnings;
}

void Label::_notification(int p_what) {
	switch (p_what) {
		case NOTIFICATION_TRANSLATION_CHANGED: {
			String new_text = atr(text);
			if (new_text == xl_text) {
				return; // Nothing new.
			}
			xl_text = new_text;
			if (visible_ratio < 1) {
				visible_chars = get_total_character_count() * visible_ratio;
			}
			dirty = true;

			queue_redraw();
			update_configuration_warnings();
		} break;

		case NOTIFICATION_LAYOUT_DIRECTION_CHANGED: {
			queue_redraw();
		} break;

		case NOTIFICATION_DRAW: {
			if (clip) {
				RenderingServer::get_singleton()->canvas_item_set_clip(get_canvas_item(), true);
			}

			if (dirty || font_dirty || lines_dirty) {
				_shape();
			}

			RID ci = get_canvas_item();

			bool has_settings = settings.is_valid();

			Size2 string_size;
			Size2 size = get_size();
			Ref<StyleBox> style = theme_cache.normal_style;
			Ref<Font> font = (has_settings && settings->get_font().is_valid()) ? settings->get_font() : theme_cache.font;
			Color font_color = has_settings ? settings->get_font_color() : theme_cache.font_color;
			Color font_shadow_color = has_settings ? settings->get_shadow_color() : theme_cache.font_shadow_color;
			Point2 shadow_ofs = has_settings ? settings->get_shadow_offset() : theme_cache.font_shadow_offset;
			int line_spacing = has_settings ? settings->get_line_spacing() : theme_cache.line_spacing;
			Color font_outline_color = has_settings ? settings->get_outline_color() : theme_cache.font_outline_color;
			int outline_size = has_settings ? settings->get_outline_size() : theme_cache.font_outline_size;
			int shadow_outline_size = has_settings ? settings->get_shadow_size() : theme_cache.font_shadow_outline_size;
			bool rtl = (TS->shaped_text_get_inferred_direction(text_rid) == TextServer::DIRECTION_RTL);
			bool rtl_layout = is_layout_rtl();

			style->draw(ci, Rect2(Point2(0, 0), get_size()));

			float total_h = 0.0;
			int lines_visible = 0;

			// Get number of lines to fit to the height.
			for (int64_t i = lines_skipped; i < lines_rid.size(); i++) {
				total_h += TS->shaped_text_get_size(lines_rid[i]).y + line_spacing;
				if (total_h > (get_size().height - style->get_minimum_size().height + line_spacing)) {
					break;
				}
				lines_visible++;
			}

			if (max_lines_visible >= 0 && lines_visible > max_lines_visible) {
				lines_visible = max_lines_visible;
			}

			int last_line = MIN(lines_rid.size(), lines_visible + lines_skipped);
			bool trim_chars = (visible_chars >= 0) && (visible_chars_behavior == TextServer::VC_CHARS_AFTER_SHAPING);
			bool trim_glyphs_ltr = (visible_chars >= 0) && ((visible_chars_behavior == TextServer::VC_GLYPHS_LTR) || ((visible_chars_behavior == TextServer::VC_GLYPHS_AUTO) && !rtl_layout));
			bool trim_glyphs_rtl = (visible_chars >= 0) && ((visible_chars_behavior == TextServer::VC_GLYPHS_RTL) || ((visible_chars_behavior == TextServer::VC_GLYPHS_AUTO) && rtl_layout));

			// Get real total height.
			int total_glyphs = 0;
			total_h = 0;
			for (int64_t i = lines_skipped; i < last_line; i++) {
				total_h += TS->shaped_text_get_size(lines_rid[i]).y + line_spacing;
				total_glyphs += TS->shaped_text_get_glyph_count(lines_rid[i]) + TS->shaped_text_get_ellipsis_glyph_count(lines_rid[i]);
			}
			int visible_glyphs = total_glyphs * visible_ratio;
			int processed_glyphs = 0;
			total_h += style->get_margin(SIDE_TOP) + style->get_margin(SIDE_BOTTOM);

			int vbegin = 0, vsep = 0;
			if (lines_visible > 0) {
				switch (vertical_alignment) {
					case VERTICAL_ALIGNMENT_TOP: {
						// Nothing.
					} break;
					case VERTICAL_ALIGNMENT_CENTER: {
						vbegin = (size.y - (total_h - line_spacing)) / 2;
						vsep = 0;

					} break;
					case VERTICAL_ALIGNMENT_BOTTOM: {
						vbegin = size.y - (total_h - line_spacing);
						vsep = 0;

					} break;
					case VERTICAL_ALIGNMENT_FILL: {
						vbegin = 0;
						if (lines_visible > 1) {
							vsep = (size.y - (total_h - line_spacing)) / (lines_visible - 1);
						} else {
							vsep = 0;
						}

					} break;
				}
			}

			Vector2 ofs;
			ofs.y = style->get_offset().y + vbegin;
			for (int i = lines_skipped; i < last_line; i++) {
				Size2 line_size = TS->shaped_text_get_size(lines_rid[i]);
				ofs.x = 0;
				ofs.y += TS->shaped_text_get_ascent(lines_rid[i]);
				switch (horizontal_alignment) {
					case HORIZONTAL_ALIGNMENT_FILL:
						if (rtl && autowrap_mode != TextServer::AUTOWRAP_OFF) {
							ofs.x = int(size.width - style->get_margin(SIDE_RIGHT) - line_size.width);
						} else {
							ofs.x = style->get_offset().x;
						}
						break;
					case HORIZONTAL_ALIGNMENT_LEFT: {
						if (rtl_layout) {
							ofs.x = int(size.width - style->get_margin(SIDE_RIGHT) - line_size.width);
						} else {
							ofs.x = style->get_offset().x;
						}
					} break;
					case HORIZONTAL_ALIGNMENT_CENTER: {
						ofs.x = int(size.width - line_size.width) / 2;
					} break;
					case HORIZONTAL_ALIGNMENT_RIGHT: {
						if (rtl_layout) {
							ofs.x = style->get_offset().x;
						} else {
							ofs.x = int(size.width - style->get_margin(SIDE_RIGHT) - line_size.width);
						}
					} break;
				}

				const Glyph *glyphs = TS->shaped_text_get_glyphs(lines_rid[i]);
				int gl_size = TS->shaped_text_get_glyph_count(lines_rid[i]);

				int ellipsis_pos = TS->shaped_text_get_ellipsis_pos(lines_rid[i]);
				int trim_pos = TS->shaped_text_get_trim_pos(lines_rid[i]);

				const Glyph *ellipsis_glyphs = TS->shaped_text_get_ellipsis_glyphs(lines_rid[i]);
				int ellipsis_gl_size = TS->shaped_text_get_ellipsis_glyph_count(lines_rid[i]);

				// Draw outline. Note: Do not merge this into the single loop with the main text, to prevent overlaps.
				int processed_glyphs_ol = processed_glyphs;
				if ((outline_size > 0 && font_outline_color.a != 0) || (font_shadow_color.a != 0)) {
					Vector2 offset = ofs;
					// Draw RTL ellipsis string when necessary.
					if (rtl && ellipsis_pos >= 0) {
						for (int gl_idx = ellipsis_gl_size - 1; gl_idx >= 0; gl_idx--) {
							for (int j = 0; j < ellipsis_glyphs[gl_idx].repeat; j++) {
								bool skip = (trim_chars && ellipsis_glyphs[gl_idx].end > visible_chars) || (trim_glyphs_ltr && (processed_glyphs_ol >= visible_glyphs)) || (trim_glyphs_rtl && (processed_glyphs_ol < total_glyphs - visible_glyphs));
								//Draw glyph outlines and shadow.
								if (!skip) {
									draw_glyph_outline(ellipsis_glyphs[gl_idx], ci, font_color, font_shadow_color, font_outline_color, shadow_outline_size, outline_size, offset, shadow_ofs);
								}
								processed_glyphs_ol++;
								offset.x += ellipsis_glyphs[gl_idx].advance;
							}
						}
					}

					// Draw main text.
					for (int j = 0; j < gl_size; j++) {
						// Trim when necessary.
						if (trim_pos >= 0) {
							if (rtl) {
								if (j < trim_pos) {
									continue;
								}
							} else {
								if (j >= trim_pos) {
									break;
								}
							}
						}
						for (int k = 0; k < glyphs[j].repeat; k++) {
							bool skip = (trim_chars && glyphs[j].end > visible_chars) || (trim_glyphs_ltr && (processed_glyphs_ol >= visible_glyphs)) || (trim_glyphs_rtl && (processed_glyphs_ol < total_glyphs - visible_glyphs));

							// Draw glyph outlines and shadow.
							if (!skip) {
								draw_glyph_outline(glyphs[j], ci, font_color, font_shadow_color, font_outline_color, shadow_outline_size, outline_size, offset, shadow_ofs);
							}
							processed_glyphs_ol++;
							offset.x += glyphs[j].advance;
						}
					}
					// Draw LTR ellipsis string when necessary.
					if (!rtl && ellipsis_pos >= 0) {
						for (int gl_idx = 0; gl_idx < ellipsis_gl_size; gl_idx++) {
							for (int j = 0; j < ellipsis_glyphs[gl_idx].repeat; j++) {
								bool skip = (trim_chars && ellipsis_glyphs[gl_idx].end > visible_chars) || (trim_glyphs_ltr && (processed_glyphs_ol >= visible_glyphs)) || (trim_glyphs_rtl && (processed_glyphs_ol < total_glyphs - visible_glyphs));
								//Draw glyph outlines and shadow.
								if (!skip) {
									draw_glyph_outline(ellipsis_glyphs[gl_idx], ci, font_color, font_shadow_color, font_outline_color, shadow_outline_size, outline_size, offset, shadow_ofs);
								}
								processed_glyphs_ol++;
								offset.x += ellipsis_glyphs[gl_idx].advance;
							}
						}
					}
				}

				// Draw main text. Note: Do not merge this into the single loop with the outline, to prevent overlaps.

				// Draw RTL ellipsis string when necessary.
				if (rtl && ellipsis_pos >= 0) {
					for (int gl_idx = ellipsis_gl_size - 1; gl_idx >= 0; gl_idx--) {
						for (int j = 0; j < ellipsis_glyphs[gl_idx].repeat; j++) {
							bool skip = (trim_chars && ellipsis_glyphs[gl_idx].end > visible_chars) || (trim_glyphs_ltr && (processed_glyphs >= visible_glyphs)) || (trim_glyphs_rtl && (processed_glyphs < total_glyphs - visible_glyphs));
							//Draw glyph outlines and shadow.
							if (!skip) {
								draw_glyph(ellipsis_glyphs[gl_idx], ci, font_color, ofs);
							}
							processed_glyphs++;
							ofs.x += ellipsis_glyphs[gl_idx].advance;
						}
					}
				}

				// Draw main text.
				for (int j = 0; j < gl_size; j++) {
					// Trim when necessary.
					if (trim_pos >= 0) {
						if (rtl) {
							if (j < trim_pos) {
								continue;
							}
						} else {
							if (j >= trim_pos) {
								break;
							}
						}
					}
					for (int k = 0; k < glyphs[j].repeat; k++) {
						bool skip = (trim_chars && glyphs[j].end > visible_chars) || (trim_glyphs_ltr && (processed_glyphs >= visible_glyphs)) || (trim_glyphs_rtl && (processed_glyphs < total_glyphs - visible_glyphs));

						// Draw glyph outlines and shadow.
						if (!skip) {
							draw_glyph(glyphs[j], ci, font_color, ofs);
						}
						processed_glyphs++;
						ofs.x += glyphs[j].advance;
					}
				}
				// Draw LTR ellipsis string when necessary.
				if (!rtl && ellipsis_pos >= 0) {
					for (int gl_idx = 0; gl_idx < ellipsis_gl_size; gl_idx++) {
						for (int j = 0; j < ellipsis_glyphs[gl_idx].repeat; j++) {
							bool skip = (trim_chars && ellipsis_glyphs[gl_idx].end > visible_chars) || (trim_glyphs_ltr && (processed_glyphs >= visible_glyphs)) || (trim_glyphs_rtl && (processed_glyphs < total_glyphs - visible_glyphs));
							//Draw glyph outlines and shadow.
							if (!skip) {
								draw_glyph(ellipsis_glyphs[gl_idx], ci, font_color, ofs);
							}
							processed_glyphs++;
							ofs.x += ellipsis_glyphs[gl_idx].advance;
						}
					}
				}
				ofs.y += TS->shaped_text_get_descent(lines_rid[i]) + vsep + line_spacing;
			}
		} break;

		case NOTIFICATION_THEME_CHANGED: {
			font_dirty = true;
			queue_redraw();
		} break;

		case NOTIFICATION_RESIZED: {
			lines_dirty = true;
		} break;
	}
}

Size2 Label::get_minimum_size() const {
	// don't want to mutable everything
	if (dirty || font_dirty || lines_dirty) {
		const_cast<Label *>(this)->_shape();
	}

	Size2 min_size = minsize;

	const Ref<Font> &font = (settings.is_valid() && settings->get_font().is_valid()) ? settings->get_font() : theme_cache.font;
	int font_size = settings.is_valid() ? settings->get_font_size() : theme_cache.font_size;

	min_size.height = MAX(min_size.height, font->get_height(font_size) + font->get_spacing(TextServer::SPACING_TOP) + font->get_spacing(TextServer::SPACING_BOTTOM));

	Size2 min_style = theme_cache.normal_style->get_minimum_size();
	if (autowrap_mode != TextServer::AUTOWRAP_OFF) {
		return Size2(1, (clip || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) ? 1 : min_size.height) + min_style;
	} else {
		if (clip || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) {
			min_size.width = 1;
		}
		return min_size + min_style;
	}
}

int Label::get_line_count() const {
	if (!is_inside_tree()) {
		return 1;
	}
	if (dirty || font_dirty || lines_dirty) {
		const_cast<Label *>(this)->_shape();
	}

	return lines_rid.size();
}

int Label::get_visible_line_count() const {
	Ref<StyleBox> style = theme_cache.normal_style;
	int line_spacing = settings.is_valid() ? settings->get_line_spacing() : theme_cache.line_spacing;
	int lines_visible = 0;
	float total_h = 0.0;
	for (int64_t i = lines_skipped; i < lines_rid.size(); i++) {
		total_h += TS->shaped_text_get_size(lines_rid[i]).y + line_spacing;
		if (total_h > (get_size().height - style->get_minimum_size().height + line_spacing)) {
			break;
		}
		lines_visible++;
	}

	if (lines_visible > lines_rid.size()) {
		lines_visible = lines_rid.size();
	}

	if (max_lines_visible >= 0 && lines_visible > max_lines_visible) {
		lines_visible = max_lines_visible;
	}

	return lines_visible;
}

void Label::set_horizontal_alignment(HorizontalAlignment p_alignment) {
	ERR_FAIL_INDEX((int)p_alignment, 4);
	if (horizontal_alignment == p_alignment) {
		return;
	}

	if (horizontal_alignment == HORIZONTAL_ALIGNMENT_FILL || p_alignment == HORIZONTAL_ALIGNMENT_FILL) {
		lines_dirty = true; // Reshape lines.
	}
	horizontal_alignment = p_alignment;

	queue_redraw();
}

HorizontalAlignment Label::get_horizontal_alignment() const {
	return horizontal_alignment;
}

void Label::set_vertical_alignment(VerticalAlignment p_alignment) {
	ERR_FAIL_INDEX((int)p_alignment, 4);

	if (vertical_alignment == p_alignment) {
		return;
	}

	vertical_alignment = p_alignment;
	queue_redraw();
}

VerticalAlignment Label::get_vertical_alignment() const {
	return vertical_alignment;
}

void Label::set_text(const String &p_string) {
	if (text == p_string) {
		return;
	}
	text = p_string;
	xl_text = atr(p_string);
	dirty = true;
	if (visible_ratio < 1) {
		visible_chars = get_total_character_count() * visible_ratio;
	}
	queue_redraw();
	update_minimum_size();
	update_configuration_warnings();
}

void Label::_invalidate() {
	font_dirty = true;
	queue_redraw();
}

void Label::set_label_settings(const Ref<LabelSettings> &p_settings) {
	if (settings != p_settings) {
		if (settings.is_valid()) {
			settings->disconnect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Label::_invalidate));
		}
		settings = p_settings;
		if (settings.is_valid()) {
			settings->connect(CoreStringNames::get_singleton()->changed, callable_mp(this, &Label::_invalidate), CONNECT_REFERENCE_COUNTED);
		}
		_invalidate();
	}
}

Ref<LabelSettings> Label::get_label_settings() const {
	return settings;
}

void Label::set_text_direction(Control::TextDirection p_text_direction) {
	ERR_FAIL_COND((int)p_text_direction < -1 || (int)p_text_direction > 3);
	if (text_direction != p_text_direction) {
		text_direction = p_text_direction;
		font_dirty = true;
		queue_redraw();
	}
}

void Label::set_structured_text_bidi_override(TextServer::StructuredTextParser p_parser) {
	if (st_parser != p_parser) {
		st_parser = p_parser;
		dirty = true;
		queue_redraw();
	}
}

TextServer::StructuredTextParser Label::get_structured_text_bidi_override() const {
	return st_parser;
}

void Label::set_structured_text_bidi_override_options(Array p_args) {
	if (st_args == p_args) {
		return;
	}

	st_args = p_args;
	dirty = true;
	queue_redraw();
}

Array Label::get_structured_text_bidi_override_options() const {
	return st_args;
}

Control::TextDirection Label::get_text_direction() const {
	return text_direction;
}

void Label::set_language(const String &p_language) {
	if (language != p_language) {
		language = p_language;
		dirty = true;
		queue_redraw();
	}
}

String Label::get_language() const {
	return language;
}

void Label::set_clip_text(bool p_clip) {
	if (clip == p_clip) {
		return;
	}

	clip = p_clip;
	queue_redraw();
	update_minimum_size();
}

bool Label::is_clipping_text() const {
	return clip;
}

void Label::set_text_overrun_behavior(TextServer::OverrunBehavior p_behavior) {
	if (overrun_behavior == p_behavior) {
		return;
	}

	overrun_behavior = p_behavior;
	lines_dirty = true;
	queue_redraw();
	if (clip || overrun_behavior != TextServer::OVERRUN_NO_TRIMMING) {
		update_minimum_size();
	}
}

TextServer::OverrunBehavior Label::get_text_overrun_behavior() const {
	return overrun_behavior;
}

String Label::get_text() const {
	return text;
}

void Label::set_visible_characters(int p_amount) {
	if (visible_chars != p_amount) {
		visible_chars = p_amount;
		if (get_total_character_count() > 0) {
			visible_ratio = (float)p_amount / (float)get_total_character_count();
		} else {
			visible_ratio = 1.0;
		}
		if (visible_chars_behavior == TextServer::VC_CHARS_BEFORE_SHAPING) {
			dirty = true;
		}
		queue_redraw();
	}
}

int Label::get_visible_characters() const {
	return visible_chars;
}

void Label::set_visible_ratio(float p_ratio) {
	if (visible_ratio != p_ratio) {
		if (p_ratio >= 1.0) {
			visible_chars = -1;
			visible_ratio = 1.0;
		} else if (p_ratio < 0.0) {
			visible_chars = 0;
			visible_ratio = 0.0;
		} else {
			visible_chars = get_total_character_count() * p_ratio;
			visible_ratio = p_ratio;
		}

		if (visible_chars_behavior == TextServer::VC_CHARS_BEFORE_SHAPING) {
			dirty = true;
		}
		queue_redraw();
	}
}

float Label::get_visible_ratio() const {
	return visible_ratio;
}

TextServer::VisibleCharactersBehavior Label::get_visible_characters_behavior() const {
	return visible_chars_behavior;
}

void Label::set_visible_characters_behavior(TextServer::VisibleCharactersBehavior p_behavior) {
	if (visible_chars_behavior != p_behavior) {
		visible_chars_behavior = p_behavior;
		dirty = true;
		queue_redraw();
	}
}

void Label::set_lines_skipped(int p_lines) {
	ERR_FAIL_COND(p_lines < 0);

	if (lines_skipped == p_lines) {
		return;
	}

	lines_skipped = p_lines;
	_update_visible();
	queue_redraw();
}

int Label::get_lines_skipped() const {
	return lines_skipped;
}

void Label::set_max_lines_visible(int p_lines) {
	if (max_lines_visible == p_lines) {
		return;
	}

	max_lines_visible = p_lines;
	_update_visible();
	queue_redraw();
}

int Label::get_max_lines_visible() const {
	return max_lines_visible;
}

int Label::get_total_character_count() const {
	if (dirty || font_dirty || lines_dirty) {
		const_cast<Label *>(this)->_shape();
	}

	return xl_text.length();
}

void Label::_bind_methods() {
	ClassDB::bind_method(D_METHOD("set_horizontal_alignment", "alignment"), &Label::set_horizontal_alignment);
	ClassDB::bind_method(D_METHOD("get_horizontal_alignment"), &Label::get_horizontal_alignment);
	ClassDB::bind_method(D_METHOD("set_vertical_alignment", "alignment"), &Label::set_vertical_alignment);
	ClassDB::bind_method(D_METHOD("get_vertical_alignment"), &Label::get_vertical_alignment);
	ClassDB::bind_method(D_METHOD("set_text", "text"), &Label::set_text);
	ClassDB::bind_method(D_METHOD("get_text"), &Label::get_text);
	ClassDB::bind_method(D_METHOD("set_label_settings", "settings"), &Label::set_label_settings);
	ClassDB::bind_method(D_METHOD("get_label_settings"), &Label::get_label_settings);
	ClassDB::bind_method(D_METHOD("set_text_direction", "direction"), &Label::set_text_direction);
	ClassDB::bind_method(D_METHOD("get_text_direction"), &Label::get_text_direction);
	ClassDB::bind_method(D_METHOD("set_language", "language"), &Label::set_language);
	ClassDB::bind_method(D_METHOD("get_language"), &Label::get_language);
	ClassDB::bind_method(D_METHOD("set_autowrap_mode", "autowrap_mode"), &Label::set_autowrap_mode);
	ClassDB::bind_method(D_METHOD("get_autowrap_mode"), &Label::get_autowrap_mode);
	ClassDB::bind_method(D_METHOD("set_clip_text", "enable"), &Label::set_clip_text);
	ClassDB::bind_method(D_METHOD("is_clipping_text"), &Label::is_clipping_text);
	ClassDB::bind_method(D_METHOD("set_text_overrun_behavior", "overrun_behavior"), &Label::set_text_overrun_behavior);
	ClassDB::bind_method(D_METHOD("get_text_overrun_behavior"), &Label::get_text_overrun_behavior);
	ClassDB::bind_method(D_METHOD("set_uppercase", "enable"), &Label::set_uppercase);
	ClassDB::bind_method(D_METHOD("is_uppercase"), &Label::is_uppercase);
	ClassDB::bind_method(D_METHOD("get_line_height", "line"), &Label::get_line_height, DEFVAL(-1));
	ClassDB::bind_method(D_METHOD("get_line_count"), &Label::get_line_count);
	ClassDB::bind_method(D_METHOD("get_visible_line_count"), &Label::get_visible_line_count);
	ClassDB::bind_method(D_METHOD("get_total_character_count"), &Label::get_total_character_count);
	ClassDB::bind_method(D_METHOD("set_visible_characters", "amount"), &Label::set_visible_characters);
	ClassDB::bind_method(D_METHOD("get_visible_characters"), &Label::get_visible_characters);
	ClassDB::bind_method(D_METHOD("get_visible_characters_behavior"), &Label::get_visible_characters_behavior);
	ClassDB::bind_method(D_METHOD("set_visible_characters_behavior", "behavior"), &Label::set_visible_characters_behavior);
	ClassDB::bind_method(D_METHOD("set_visible_ratio", "ratio"), &Label::set_visible_ratio);
	ClassDB::bind_method(D_METHOD("get_visible_ratio"), &Label::get_visible_ratio);
	ClassDB::bind_method(D_METHOD("set_lines_skipped", "lines_skipped"), &Label::set_lines_skipped);
	ClassDB::bind_method(D_METHOD("get_lines_skipped"), &Label::get_lines_skipped);
	ClassDB::bind_method(D_METHOD("set_max_lines_visible", "lines_visible"), &Label::set_max_lines_visible);
	ClassDB::bind_method(D_METHOD("get_max_lines_visible"), &Label::get_max_lines_visible);
	ClassDB::bind_method(D_METHOD("set_structured_text_bidi_override", "parser"), &Label::set_structured_text_bidi_override);
	ClassDB::bind_method(D_METHOD("get_structured_text_bidi_override"), &Label::get_structured_text_bidi_override);
	ClassDB::bind_method(D_METHOD("set_structured_text_bidi_override_options", "args"), &Label::set_structured_text_bidi_override_options);
	ClassDB::bind_method(D_METHOD("get_structured_text_bidi_override_options"), &Label::get_structured_text_bidi_override_options);

	ADD_PROPERTY(PropertyInfo(Variant::STRING, "text", PROPERTY_HINT_MULTILINE_TEXT, "", PROPERTY_USAGE_DEFAULT_INTL), "set_text", "get_text");
	ADD_PROPERTY(PropertyInfo(Variant::OBJECT, "label_settings", PROPERTY_HINT_RESOURCE_TYPE, "LabelSettings"), "set_label_settings", "get_label_settings");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "horizontal_alignment", PROPERTY_HINT_ENUM, "Left,Center,Right,Fill"), "set_horizontal_alignment", "get_horizontal_alignment");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "vertical_alignment", PROPERTY_HINT_ENUM, "Top,Center,Bottom,Fill"), "set_vertical_alignment", "get_vertical_alignment");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "autowrap_mode", PROPERTY_HINT_ENUM, "Off,Arbitrary,Word,Word (Smart)"), "set_autowrap_mode", "get_autowrap_mode");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "clip_text"), "set_clip_text", "is_clipping_text");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "text_overrun_behavior", PROPERTY_HINT_ENUM, "Trim Nothing,Trim Characters,Trim Words,Ellipsis,Word Ellipsis"), "set_text_overrun_behavior", "get_text_overrun_behavior");
	ADD_PROPERTY(PropertyInfo(Variant::BOOL, "uppercase"), "set_uppercase", "is_uppercase");

	ADD_GROUP("Displayed Text", "");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "lines_skipped", PROPERTY_HINT_RANGE, "0,999,1"), "set_lines_skipped", "get_lines_skipped");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "max_lines_visible", PROPERTY_HINT_RANGE, "-1,999,1"), "set_max_lines_visible", "get_max_lines_visible");
	// Note: "visible_characters" and "visible_ratio" should be set after "text" to be correctly applied.
	ADD_PROPERTY(PropertyInfo(Variant::INT, "visible_characters", PROPERTY_HINT_RANGE, "-1,128000,1"), "set_visible_characters", "get_visible_characters");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "visible_characters_behavior", PROPERTY_HINT_ENUM, "Characters Before Shaping,Characters After Shaping,Glyphs (Layout Direction),Glyphs (Left-to-Right),Glyphs (Right-to-Left)"), "set_visible_characters_behavior", "get_visible_characters_behavior");
	ADD_PROPERTY(PropertyInfo(Variant::FLOAT, "visible_ratio", PROPERTY_HINT_RANGE, "0,1,0.001"), "set_visible_ratio", "get_visible_ratio");

	ADD_GROUP("BiDi", "");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "text_direction", PROPERTY_HINT_ENUM, "Auto,Left-to-Right,Right-to-Left,Inherited"), "set_text_direction", "get_text_direction");
	ADD_PROPERTY(PropertyInfo(Variant::STRING, "language", PROPERTY_HINT_LOCALE_ID, ""), "set_language", "get_language");
	ADD_PROPERTY(PropertyInfo(Variant::INT, "structured_text_bidi_override", PROPERTY_HINT_ENUM, "Default,URI,File,Email,List,None,Custom"), "set_structured_text_bidi_override", "get_structured_text_bidi_override");
	ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "structured_text_bidi_override_options"), "set_structured_text_bidi_override_options", "get_structured_text_bidi_override_options");
}

Label::Label(const String &p_text) {
	text_rid = TS->create_shaped_text();

	set_mouse_filter(MOUSE_FILTER_IGNORE);
	set_text(p_text);
	set_v_size_flags(SIZE_SHRINK_CENTER);
}

Label::~Label() {
	for (int i = 0; i < lines_rid.size(); i++) {
		TS->free_rid(lines_rid[i]);
	}
	lines_rid.clear();
	TS->free_rid(text_rid);
}