[TextServer] Add function to change font, font size, and OpenType features without invalidating line break points, justification points, or recreating shaped text buffer.

2 files changed, 195 insertions, 129 deletions

diff --git a/modules/text_server_fb/text_server_fb.cpp b/modules/text_server_fb/text_server_fb.cpp
index 4a0415fbf9..dd520a2e40 100644
--- a/modules/text_server_fb/text_server_fb.cpp
+++ b/modules/text_server_fb/text_server_fb.cpp
@@ -91,7 +91,7 @@ void TextServerFallback::free(RID p_rid) {
 		font_owner.free(p_rid);
 		memdelete(fd);
 	} else if (shaped_owner.owns(p_rid)) {
-		ShapedTextData *sd = shaped_owner.get_or_null(p_rid);
+		ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_rid);
 		shaped_owner.free(p_rid);
 		memdelete(sd);
 	}
@@ -2061,7 +2061,7 @@ void TextServerFallback::font_set_global_oversampling(float p_oversampling) {
 /* Shaped text buffer interface                                          */
 /*************************************************************************/
 
-void TextServerFallback::invalidate(ShapedTextData *p_shaped) {
+void TextServerFallback::invalidate(ShapedTextDataFallback *p_shaped) {
 	p_shaped->valid = false;
 	p_shaped->sort_valid = false;
 	p_shaped->line_breaks_valid = false;
@@ -2075,17 +2075,17 @@ void TextServerFallback::invalidate(ShapedTextData *p_shaped) {
 	p_shaped->glyphs_logical.clear();
 }
 
-void TextServerFallback::full_copy(ShapedTextData *p_shaped) {
-	ShapedTextData *parent = shaped_owner.get_or_null(p_shaped->parent);
+void TextServerFallback::full_copy(ShapedTextDataFallback *p_shaped) {
+	ShapedTextDataFallback *parent = shaped_owner.get_or_null(p_shaped->parent);
 
-	for (const KeyValue<Variant, ShapedTextData::EmbeddedObject> &E : parent->objects) {
+	for (const KeyValue<Variant, ShapedTextDataFallback::EmbeddedObject> &E : parent->objects) {
 		if (E.value.pos >= p_shaped->start && E.value.pos < p_shaped->end) {
 			p_shaped->objects[E.key] = E.value;
 		}
 	}
 
 	for (int k = 0; k < parent->spans.size(); k++) {
-		ShapedTextData::Span span = parent->spans[k];
+		ShapedTextDataFallback::Span span = parent->spans[k];
 		if (span.start >= p_shaped->end || span.end <= p_shaped->start) {
 			continue;
 		}
@@ -2099,7 +2099,7 @@ void TextServerFallback::full_copy(ShapedTextData *p_shaped) {
 
 RID TextServerFallback::create_shaped_text(TextServer::Direction p_direction, TextServer::Orientation p_orientation) {
 	_THREAD_SAFE_METHOD_
-	ShapedTextData *sd = memnew(ShapedTextData);
+	ShapedTextDataFallback *sd = memnew(ShapedTextDataFallback);
 	sd->direction = p_direction;
 	sd->orientation = p_orientation;
 
@@ -2107,7 +2107,7 @@ RID TextServerFallback::create_shaped_text(TextServer::Direction p_direction, Te
 }
 
 void TextServerFallback::shaped_text_clear(RID p_shaped) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND(!sd);
 
 	MutexLock lock(sd->mutex);
@@ -2136,7 +2136,7 @@ TextServer::Direction TextServerFallback::shaped_text_get_inferred_direction(RID
 
 void TextServerFallback::shaped_text_set_custom_punctuation(RID p_shaped, const String &p_punct) {
 	_THREAD_SAFE_METHOD_
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND(!sd);
 
 	if (sd->custom_punct != p_punct) {
@@ -2150,13 +2150,13 @@ void TextServerFallback::shaped_text_set_custom_punctuation(RID p_shaped, const
 
 String TextServerFallback::shaped_text_get_custom_punctuation(RID p_shaped) const {
 	_THREAD_SAFE_METHOD_
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, String());
 	return sd->custom_punct;
 }
 
 void TextServerFallback::shaped_text_set_orientation(RID p_shaped, TextServer::Orientation p_orientation) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND(!sd);
 
 	MutexLock lock(sd->mutex);
@@ -2174,7 +2174,7 @@ void TextServerFallback::shaped_text_set_bidi_override(RID p_shaped, const Array
 }
 
 TextServer::Orientation TextServerFallback::shaped_text_get_orientation(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, TextServer::ORIENTATION_HORIZONTAL);
 
 	MutexLock lock(sd->mutex);
@@ -2182,7 +2182,7 @@ TextServer::Orientation TextServerFallback::shaped_text_get_orientation(RID p_sh
 }
 
 void TextServerFallback::shaped_text_set_preserve_invalid(RID p_shaped, bool p_enabled) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 
 	MutexLock lock(sd->mutex);
 	ERR_FAIL_COND(!sd);
@@ -2196,7 +2196,7 @@ void TextServerFallback::shaped_text_set_preserve_invalid(RID p_shaped, bool p_e
 }
 
 bool TextServerFallback::shaped_text_get_preserve_invalid(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -2204,7 +2204,7 @@ bool TextServerFallback::shaped_text_get_preserve_invalid(RID p_shaped) const {
 }
 
 void TextServerFallback::shaped_text_set_preserve_control(RID p_shaped, bool p_enabled) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND(!sd);
 
 	MutexLock lock(sd->mutex);
@@ -2218,15 +2218,52 @@ void TextServerFallback::shaped_text_set_preserve_control(RID p_shaped, bool p_e
 }
 
 bool TextServerFallback::shaped_text_get_preserve_control(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
 	return sd->preserve_control;
 }
 
-bool TextServerFallback::shaped_text_add_string(RID p_shaped, const String &p_text, const Vector<RID> &p_fonts, int p_size, const Dictionary &p_opentype_features, const String &p_language) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+int TextServerFallback::shaped_get_span_count(RID p_shaped) const {
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
+	ERR_FAIL_COND_V(!sd, 0);
+	return sd->spans.size();
+}
+
+Variant TextServerFallback::shaped_get_span_meta(RID p_shaped, int p_index) const {
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
+	ERR_FAIL_COND_V(!sd, Variant());
+	ERR_FAIL_INDEX_V(p_index, sd->spans.size(), Variant());
+	return sd->spans[p_index].meta;
+}
+
+void TextServerFallback::shaped_set_span_update_font(RID p_shaped, int p_index, const Vector<RID> &p_fonts, int p_size, const Dictionary &p_opentype_features) {
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
+	ERR_FAIL_COND(!sd);
+	ERR_FAIL_INDEX(p_index, sd->spans.size());
+
+	ShapedTextDataFallback::Span &span = sd->spans.write[p_index];
+	span.fonts.clear();
+	// Pre-sort fonts, push fonts with the language support first.
+	Vector<RID> fonts_no_match;
+	int font_count = p_fonts.size();
+	for (int i = 0; i < font_count; i++) {
+		if (font_is_language_supported(p_fonts[i], span.language)) {
+			span.fonts.push_back(p_fonts[i]);
+		} else {
+			fonts_no_match.push_back(p_fonts[i]);
+		}
+	}
+	span.fonts.append_array(fonts_no_match);
+	span.font_size = p_size;
+	span.features = p_opentype_features;
+
+	sd->valid = false;
+}
+
+bool TextServerFallback::shaped_text_add_string(RID p_shaped, const String &p_text, const Vector<RID> &p_fonts, int p_size, const Dictionary &p_opentype_features, const String &p_language, const Variant &p_meta) {
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -2244,7 +2281,7 @@ bool TextServerFallback::shaped_text_add_string(RID p_shaped, const String &p_te
 		full_copy(sd);
 	}
 
-	ShapedTextData::Span span;
+	ShapedTextDataFallback::Span span;
 	span.start = sd->text.length();
 	span.end = span.start + p_text.length();
 
@@ -2263,6 +2300,7 @@ bool TextServerFallback::shaped_text_add_string(RID p_shaped, const String &p_te
 	ERR_FAIL_COND_V(span.fonts.is_empty(), false);
 	span.font_size = p_size;
 	span.language = p_language;
+	span.meta = p_meta;
 
 	sd->spans.push_back(span);
 	sd->text += p_text;
@@ -2273,7 +2311,7 @@ bool TextServerFallback::shaped_text_add_string(RID p_shaped, const String &p_te
 }
 
 bool TextServerFallback::shaped_text_add_object(RID p_shaped, Variant p_key, const Size2 &p_size, InlineAlignment p_inline_align, int p_length) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -2284,12 +2322,12 @@ bool TextServerFallback::shaped_text_add_object(RID p_shaped, Variant p_key, con
 		full_copy(sd);
 	}
 
-	ShapedTextData::Span span;
+	ShapedTextDataFallback::Span span;
 	span.start = sd->start + sd->text.length();
 	span.end = span.start + p_length;
 	span.embedded_key = p_key;
 
-	ShapedTextData::EmbeddedObject obj;
+	ShapedTextDataFallback::EmbeddedObject obj;
 	obj.inline_align = p_inline_align;
 	obj.rect.size = p_size;
 	obj.pos = span.start;
@@ -2304,7 +2342,7 @@ bool TextServerFallback::shaped_text_add_object(RID p_shaped, Variant p_key, con
 }
 
 bool TextServerFallback::shaped_text_resize_object(RID p_shaped, Variant p_key, const Size2 &p_size, InlineAlignment p_inline_align) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -2324,7 +2362,7 @@ bool TextServerFallback::shaped_text_resize_object(RID p_shaped, Variant p_key,
 			Glyph gl = sd->glyphs[i];
 			Variant key;
 			if (gl.count == 1) {
-				for (const KeyValue<Variant, ShapedTextData::EmbeddedObject> &E : sd->objects) {
+				for (const KeyValue<Variant, ShapedTextDataFallback::EmbeddedObject> &E : sd->objects) {
 					if (E.value.pos == gl.start) {
 						key = E.key;
 						break;
@@ -2364,79 +2402,82 @@ bool TextServerFallback::shaped_text_resize_object(RID p_shaped, Variant p_key,
 				sd->width += gl.advance * gl.repeat;
 			}
 		}
+		_realign(sd);
+	}
+	return true;
+}
 
-		// Align embedded objects to baseline.
-		float full_ascent = sd->ascent;
-		float full_descent = sd->descent;
-		for (KeyValue<Variant, ShapedTextData::EmbeddedObject> &E : sd->objects) {
-			if ((E.value.pos >= sd->start) && (E.value.pos < sd->end)) {
-				if (sd->orientation == ORIENTATION_HORIZONTAL) {
-					switch (E.value.inline_align & INLINE_ALIGNMENT_TEXT_MASK) {
-						case INLINE_ALIGNMENT_TO_TOP: {
-							E.value.rect.position.y = -sd->ascent;
-						} break;
-						case INLINE_ALIGNMENT_TO_CENTER: {
-							E.value.rect.position.y = (-sd->ascent + sd->descent) / 2;
-						} break;
-						case INLINE_ALIGNMENT_TO_BASELINE: {
-							E.value.rect.position.y = 0;
-						} break;
-						case INLINE_ALIGNMENT_TO_BOTTOM: {
-							E.value.rect.position.y = sd->descent;
-						} break;
-					}
-					switch (E.value.inline_align & INLINE_ALIGNMENT_IMAGE_MASK) {
-						case INLINE_ALIGNMENT_BOTTOM_TO: {
-							E.value.rect.position.y -= E.value.rect.size.y;
-						} break;
-						case INLINE_ALIGNMENT_CENTER_TO: {
-							E.value.rect.position.y -= E.value.rect.size.y / 2;
-						} break;
-						case INLINE_ALIGNMENT_TOP_TO: {
-							// NOP
-						} break;
-					}
-					full_ascent = MAX(full_ascent, -E.value.rect.position.y);
-					full_descent = MAX(full_descent, E.value.rect.position.y + E.value.rect.size.y);
-				} else {
-					switch (E.value.inline_align & INLINE_ALIGNMENT_TEXT_MASK) {
-						case INLINE_ALIGNMENT_TO_TOP: {
-							E.value.rect.position.x = -sd->ascent;
-						} break;
-						case INLINE_ALIGNMENT_TO_CENTER: {
-							E.value.rect.position.x = (-sd->ascent + sd->descent) / 2;
-						} break;
-						case INLINE_ALIGNMENT_TO_BASELINE: {
-							E.value.rect.position.x = 0;
-						} break;
-						case INLINE_ALIGNMENT_TO_BOTTOM: {
-							E.value.rect.position.x = sd->descent;
-						} break;
-					}
-					switch (E.value.inline_align & INLINE_ALIGNMENT_IMAGE_MASK) {
-						case INLINE_ALIGNMENT_BOTTOM_TO: {
-							E.value.rect.position.x -= E.value.rect.size.x;
-						} break;
-						case INLINE_ALIGNMENT_CENTER_TO: {
-							E.value.rect.position.x -= E.value.rect.size.x / 2;
-						} break;
-						case INLINE_ALIGNMENT_TOP_TO: {
-							// NOP
-						} break;
-					}
-					full_ascent = MAX(full_ascent, -E.value.rect.position.x);
-					full_descent = MAX(full_descent, E.value.rect.position.x + E.value.rect.size.x);
+void TextServerFallback::_realign(ShapedTextDataFallback *p_sd) const {
+	// Align embedded objects to baseline.
+	float full_ascent = p_sd->ascent;
+	float full_descent = p_sd->descent;
+	for (KeyValue<Variant, ShapedTextDataFallback::EmbeddedObject> &E : p_sd->objects) {
+		if ((E.value.pos >= p_sd->start) && (E.value.pos < p_sd->end)) {
+			if (p_sd->orientation == ORIENTATION_HORIZONTAL) {
+				switch (E.value.inline_align & INLINE_ALIGNMENT_TEXT_MASK) {
+					case INLINE_ALIGNMENT_TO_TOP: {
+						E.value.rect.position.y = -p_sd->ascent;
+					} break;
+					case INLINE_ALIGNMENT_TO_CENTER: {
+						E.value.rect.position.y = (-p_sd->ascent + p_sd->descent) / 2;
+					} break;
+					case INLINE_ALIGNMENT_TO_BASELINE: {
+						E.value.rect.position.y = 0;
+					} break;
+					case INLINE_ALIGNMENT_TO_BOTTOM: {
+						E.value.rect.position.y = p_sd->descent;
+					} break;
+				}
+				switch (E.value.inline_align & INLINE_ALIGNMENT_IMAGE_MASK) {
+					case INLINE_ALIGNMENT_BOTTOM_TO: {
+						E.value.rect.position.y -= E.value.rect.size.y;
+					} break;
+					case INLINE_ALIGNMENT_CENTER_TO: {
+						E.value.rect.position.y -= E.value.rect.size.y / 2;
+					} break;
+					case INLINE_ALIGNMENT_TOP_TO: {
+						// NOP
+					} break;
 				}
+				full_ascent = MAX(full_ascent, -E.value.rect.position.y);
+				full_descent = MAX(full_descent, E.value.rect.position.y + E.value.rect.size.y);
+			} else {
+				switch (E.value.inline_align & INLINE_ALIGNMENT_TEXT_MASK) {
+					case INLINE_ALIGNMENT_TO_TOP: {
+						E.value.rect.position.x = -p_sd->ascent;
+					} break;
+					case INLINE_ALIGNMENT_TO_CENTER: {
+						E.value.rect.position.x = (-p_sd->ascent + p_sd->descent) / 2;
+					} break;
+					case INLINE_ALIGNMENT_TO_BASELINE: {
+						E.value.rect.position.x = 0;
+					} break;
+					case INLINE_ALIGNMENT_TO_BOTTOM: {
+						E.value.rect.position.x = p_sd->descent;
+					} break;
+				}
+				switch (E.value.inline_align & INLINE_ALIGNMENT_IMAGE_MASK) {
+					case INLINE_ALIGNMENT_BOTTOM_TO: {
+						E.value.rect.position.x -= E.value.rect.size.x;
+					} break;
+					case INLINE_ALIGNMENT_CENTER_TO: {
+						E.value.rect.position.x -= E.value.rect.size.x / 2;
+					} break;
+					case INLINE_ALIGNMENT_TOP_TO: {
+						// NOP
+					} break;
+				}
+				full_ascent = MAX(full_ascent, -E.value.rect.position.x);
+				full_descent = MAX(full_descent, E.value.rect.position.x + E.value.rect.size.x);
 			}
 		}
-		sd->ascent = full_ascent;
-		sd->descent = full_descent;
 	}
-	return true;
+	p_sd->ascent = full_ascent;
+	p_sd->descent = full_descent;
 }
 
 RID TextServerFallback::shaped_text_substr(RID p_shaped, int p_start, int p_length) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, RID());
 
 	MutexLock lock(sd->mutex);
@@ -2450,7 +2491,7 @@ RID TextServerFallback::shaped_text_substr(RID p_shaped, int p_start, int p_leng
 	ERR_FAIL_COND_V(sd->start > p_start || sd->end < p_start, RID());
 	ERR_FAIL_COND_V(sd->end < p_start + p_length, RID());
 
-	ShapedTextData *new_sd = memnew(ShapedTextData);
+	ShapedTextDataFallback *new_sd = memnew(ShapedTextDataFallback);
 	new_sd->parent = p_shaped;
 	new_sd->start = p_start;
 	new_sd->end = p_start + p_length;
@@ -2476,7 +2517,7 @@ RID TextServerFallback::shaped_text_substr(RID p_shaped, int p_start, int p_leng
 				Variant key;
 				bool find_embedded = false;
 				if (gl.count == 1) {
-					for (const KeyValue<Variant, ShapedTextData::EmbeddedObject> &E : sd->objects) {
+					for (const KeyValue<Variant, ShapedTextDataFallback::EmbeddedObject> &E : sd->objects) {
 						if (E.value.pos == gl.start) {
 							find_embedded = true;
 							key = E.key;
@@ -2520,7 +2561,7 @@ RID TextServerFallback::shaped_text_substr(RID p_shaped, int p_start, int p_leng
 		// Align embedded objects to baseline.
 		float full_ascent = new_sd->ascent;
 		float full_descent = new_sd->descent;
-		for (KeyValue<Variant, ShapedTextData::EmbeddedObject> &E : new_sd->objects) {
+		for (KeyValue<Variant, ShapedTextDataFallback::EmbeddedObject> &E : new_sd->objects) {
 			if ((E.value.pos >= new_sd->start) && (E.value.pos < new_sd->end)) {
 				if (sd->orientation == ORIENTATION_HORIZONTAL) {
 					switch (E.value.inline_align & INLINE_ALIGNMENT_TEXT_MASK) {
@@ -2590,7 +2631,7 @@ RID TextServerFallback::shaped_text_substr(RID p_shaped, int p_start, int p_leng
 }
 
 RID TextServerFallback::shaped_text_get_parent(RID p_shaped) const {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, RID());
 
 	MutexLock lock(sd->mutex);
@@ -2598,7 +2639,7 @@ RID TextServerFallback::shaped_text_get_parent(RID p_shaped) const {
 }
 
 float TextServerFallback::shaped_text_fit_to_width(RID p_shaped, float p_width, uint16_t /*JustificationFlag*/ p_jst_flags) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0.f);
 
 	MutexLock lock(sd->mutex);
@@ -2707,7 +2748,7 @@ float TextServerFallback::shaped_text_fit_to_width(RID p_shaped, float p_width,
 }
 
 float TextServerFallback::shaped_text_tab_align(RID p_shaped, const PackedFloat32Array &p_tab_stops) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0.f);
 
 	MutexLock lock(sd->mutex);
@@ -2763,7 +2804,7 @@ float TextServerFallback::shaped_text_tab_align(RID p_shaped, const PackedFloat3
 }
 
 bool TextServerFallback::shaped_text_update_breaks(RID p_shaped) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -2819,7 +2860,7 @@ bool TextServerFallback::shaped_text_update_breaks(RID p_shaped) {
 }
 
 bool TextServerFallback::shaped_text_update_justification_ops(RID p_shaped) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -2835,7 +2876,7 @@ bool TextServerFallback::shaped_text_update_justification_ops(RID p_shaped) {
 }
 
 void TextServerFallback::shaped_text_overrun_trim_to_width(RID p_shaped_line, float p_width, uint16_t p_trim_flags) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped_line);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped_line);
 	ERR_FAIL_COND_MSG(!sd, "ShapedTextDataFallback invalid.");
 
 	MutexLock lock(sd->mutex);
@@ -2863,9 +2904,9 @@ void TextServerFallback::shaped_text_overrun_trim_to_width(RID p_shaped_line, fl
 		return;
 	}
 
-	Vector<ShapedTextData::Span> &spans = sd->spans;
+	Vector<ShapedTextDataFallback::Span> &spans = sd->spans;
 	if (sd->parent != RID()) {
-		ShapedTextData *parent_sd = shaped_owner.get_or_null(sd->parent);
+		ShapedTextDataFallback *parent_sd = shaped_owner.get_or_null(sd->parent);
 		ERR_FAIL_COND(!parent_sd->valid);
 		spans = parent_sd->spans;
 	}
@@ -2987,39 +3028,39 @@ void TextServerFallback::shaped_text_overrun_trim_to_width(RID p_shaped_line, fl
 }
 
 int TextServerFallback::shaped_text_get_trim_pos(RID p_shaped) const {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
-	ERR_FAIL_COND_V_MSG(!sd, -1, "ShapedTextData invalid.");
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
+	ERR_FAIL_COND_V_MSG(!sd, -1, "ShapedTextDataFallback invalid.");
 
 	MutexLock lock(sd->mutex);
 	return sd->overrun_trim_data.trim_pos;
 }
 
 int TextServerFallback::shaped_text_get_ellipsis_pos(RID p_shaped) const {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
-	ERR_FAIL_COND_V_MSG(!sd, -1, "ShapedTextData invalid.");
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
+	ERR_FAIL_COND_V_MSG(!sd, -1, "ShapedTextDataFallback invalid.");
 
 	MutexLock lock(sd->mutex);
 	return sd->overrun_trim_data.ellipsis_pos;
 }
 
 const Glyph *TextServerFallback::shaped_text_get_ellipsis_glyphs(RID p_shaped) const {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
-	ERR_FAIL_COND_V_MSG(!sd, nullptr, "ShapedTextData invalid.");
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
+	ERR_FAIL_COND_V_MSG(!sd, nullptr, "ShapedTextDataFallback invalid.");
 
 	MutexLock lock(sd->mutex);
 	return sd->overrun_trim_data.ellipsis_glyph_buf.ptr();
 }
 
 int TextServerFallback::shaped_text_get_ellipsis_glyph_count(RID p_shaped) const {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
-	ERR_FAIL_COND_V_MSG(!sd, 0, "ShapedTextData invalid.");
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
+	ERR_FAIL_COND_V_MSG(!sd, 0, "ShapedTextDataFallback invalid.");
 
 	MutexLock lock(sd->mutex);
 	return sd->overrun_trim_data.ellipsis_glyph_buf.size();
 }
 
 bool TextServerFallback::shaped_text_shape(RID p_shaped) {
-	ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -3046,7 +3087,7 @@ bool TextServerFallback::shaped_text_shape(RID p_shaped) {
 
 	// "Shape" string.
 	for (int i = 0; i < sd->spans.size(); i++) {
-		const ShapedTextData::Span &span = sd->spans[i];
+		const ShapedTextDataFallback::Span &span = sd->spans[i];
 		if (span.embedded_key != Variant()) {
 			// Embedded object.
 			if (sd->orientation == ORIENTATION_HORIZONTAL) {
@@ -3146,7 +3187,7 @@ bool TextServerFallback::shaped_text_shape(RID p_shaped) {
 	// Align embedded objects to baseline.
 	float full_ascent = sd->ascent;
 	float full_descent = sd->descent;
-	for (KeyValue<Variant, ShapedTextData::EmbeddedObject> &E : sd->objects) {
+	for (KeyValue<Variant, ShapedTextDataFallback::EmbeddedObject> &E : sd->objects) {
 		if (sd->orientation == ORIENTATION_HORIZONTAL) {
 			switch (E.value.inline_align & INLINE_ALIGNMENT_TEXT_MASK) {
 				case INLINE_ALIGNMENT_TO_TOP: {
@@ -3212,7 +3253,7 @@ bool TextServerFallback::shaped_text_shape(RID p_shaped) {
 }
 
 bool TextServerFallback::shaped_text_is_ready(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, false);
 
 	MutexLock lock(sd->mutex);
@@ -3220,7 +3261,7 @@ bool TextServerFallback::shaped_text_is_ready(RID p_shaped) const {
 }
 
 const Glyph *TextServerFallback::shaped_text_get_glyphs(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, nullptr);
 
 	MutexLock lock(sd->mutex);
@@ -3231,7 +3272,7 @@ const Glyph *TextServerFallback::shaped_text_get_glyphs(RID p_shaped) const {
 }
 
 int TextServerFallback::shaped_text_get_glyph_count(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0);
 
 	MutexLock lock(sd->mutex);
@@ -3242,7 +3283,7 @@ int TextServerFallback::shaped_text_get_glyph_count(RID p_shaped) const {
 }
 
 const Glyph *TextServerFallback::shaped_text_sort_logical(RID p_shaped) {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, nullptr);
 
 	MutexLock lock(sd->mutex);
@@ -3254,7 +3295,7 @@ const Glyph *TextServerFallback::shaped_text_sort_logical(RID p_shaped) {
 }
 
 Vector2i TextServerFallback::shaped_text_get_range(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, Vector2i());
 
 	MutexLock lock(sd->mutex);
@@ -3263,11 +3304,11 @@ Vector2i TextServerFallback::shaped_text_get_range(RID p_shaped) const {
 
 Array TextServerFallback::shaped_text_get_objects(RID p_shaped) const {
 	Array ret;
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, ret);
 
 	MutexLock lock(sd->mutex);
-	for (const KeyValue<Variant, ShapedTextData::EmbeddedObject> &E : sd->objects) {
+	for (const KeyValue<Variant, ShapedTextDataFallback::EmbeddedObject> &E : sd->objects) {
 		ret.push_back(E.key);
 	}
 
@@ -3275,7 +3316,7 @@ Array TextServerFallback::shaped_text_get_objects(RID p_shaped) const {
 }
 
 Rect2 TextServerFallback::shaped_text_get_object_rect(RID p_shaped, Variant p_key) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, Rect2());
 
 	MutexLock lock(sd->mutex);
@@ -3287,7 +3328,7 @@ Rect2 TextServerFallback::shaped_text_get_object_rect(RID p_shaped, Variant p_ke
 }
 
 Size2 TextServerFallback::shaped_text_get_size(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, Size2());
 
 	MutexLock lock(sd->mutex);
@@ -3302,7 +3343,7 @@ Size2 TextServerFallback::shaped_text_get_size(RID p_shaped) const {
 }
 
 float TextServerFallback::shaped_text_get_ascent(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0.f);
 
 	MutexLock lock(sd->mutex);
@@ -3313,7 +3354,7 @@ float TextServerFallback::shaped_text_get_ascent(RID p_shaped) const {
 }
 
 float TextServerFallback::shaped_text_get_descent(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0.f);
 
 	MutexLock lock(sd->mutex);
@@ -3324,7 +3365,7 @@ float TextServerFallback::shaped_text_get_descent(RID p_shaped) const {
 }
 
 float TextServerFallback::shaped_text_get_width(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0.f);
 
 	MutexLock lock(sd->mutex);
@@ -3335,7 +3376,7 @@ float TextServerFallback::shaped_text_get_width(RID p_shaped) const {
 }
 
 float TextServerFallback::shaped_text_get_underline_position(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0.f);
 
 	MutexLock lock(sd->mutex);
@@ -3347,7 +3388,7 @@ float TextServerFallback::shaped_text_get_underline_position(RID p_shaped) const
 }
 
 float TextServerFallback::shaped_text_get_underline_thickness(RID p_shaped) const {
-	const ShapedTextData *sd = shaped_owner.get_or_null(p_shaped);
+	const ShapedTextDataFallback *sd = shaped_owner.get_or_null(p_shaped);
 	ERR_FAIL_COND_V(!sd, 0.f);
 
 	MutexLock lock(sd->mutex);
diff --git a/modules/text_server_fb/text_server_fb.h b/modules/text_server_fb/text_server_fb.h
index b356b90d2c..be944cde58 100644
--- a/modules/text_server_fb/text_server_fb.h
+++ b/modules/text_server_fb/text_server_fb.h
@@ -203,17 +203,38 @@ class TextServerFallback : public TextServer {
 		}
 	}
 
+	// Shaped text cache data.
+
+	struct ShapedTextDataFallback : public ShapedTextData {
+		struct Span {
+			int start = -1;
+			int end = -1;
+
+			Vector<RID> fonts;
+			int font_size = 0;
+
+			Variant embedded_key;
+
+			String language;
+			Dictionary features;
+			Variant meta;
+		};
+		Vector<Span> spans;
+	};
+
 	// Common data.
 
 	float oversampling = 1.f;
 	mutable RID_PtrOwner<FontDataFallback> font_owner;
-	mutable RID_PtrOwner<ShapedTextData> shaped_owner;
+	mutable RID_PtrOwner<ShapedTextDataFallback> shaped_owner;
+
+	void _realign(ShapedTextDataFallback *p_sd) const;
 
 protected:
 	static void _bind_methods(){};
 
-	void full_copy(ShapedTextData *p_shaped);
-	void invalidate(ShapedTextData *p_shaped);
+	void full_copy(ShapedTextDataFallback *p_shaped);
+	void invalidate(ShapedTextDataFallback *p_shaped);
 
 public:
 	virtual bool has_feature(Feature p_feature) const override;
@@ -391,10 +412,14 @@ public:
 	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_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 = "", const Variant &p_meta = Variant()) override;
 	virtual bool shaped_text_add_object(RID p_shaped, Variant p_key, const Size2 &p_size, InlineAlignment p_inline_align = INLINE_ALIGNMENT_CENTER, int p_length = 1) override;
 	virtual bool shaped_text_resize_object(RID p_shaped, Variant p_key, const Size2 &p_size, InlineAlignment p_inline_align = INLINE_ALIGNMENT_CENTER) override;
 
+	virtual int shaped_get_span_count(RID p_shaped) const override;
+	virtual Variant shaped_get_span_meta(RID p_shaped, int p_index) const override;
+	virtual void shaped_set_span_update_font(RID p_shaped, int p_index, const Vector<RID> &p_fonts, int p_size, const Dictionary &p_opentype_features = Dictionary()) 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;