[TextServer] Add mutex for FreeType face creation/deletion operations.

(cherry picked from commit c950a1ab9479e53f8b91d457f44cea9246e24e4e)

2 files changed, 48 insertions, 35 deletions

diff --git a/modules/text_server_fb/text_server_fb.cpp b/modules/text_server_fb/text_server_fb.cpp
index 15124ad488..8687726287 100644
--- a/modules/text_server_fb/text_server_fb.cpp
+++ b/modules/text_server_fb/text_server_fb.cpp
@@ -113,6 +113,8 @@ int64_t TextServerFallback::_get_features() const {
 void TextServerFallback::_free_rid(const RID &p_rid) {
 	_THREAD_SAFE_METHOD_
 	if (font_owner.owns(p_rid)) {
+		MutexLock ftlock(ft_mutex);
+
 		FontFallback *fd = font_owner.get_or_null(p_rid);
 		{
 			MutexLock lock(fd->mutex);
@@ -760,45 +762,48 @@ _FORCE_INLINE_ bool TextServerFallback::_ensure_cache_for_size(FontFallback *p_f
 		// Init dynamic font.
 #ifdef MODULE_FREETYPE_ENABLED
 		int error = 0;
-		if (!ft_library) {
-			error = FT_Init_FreeType(&ft_library);
-			if (error != 0) {
-				memdelete(fd);
-				ERR_FAIL_V_MSG(false, "FreeType: Error initializing library: '" + String(FT_Error_String(error)) + "'.");
-			}
+		{
+			MutexLock ftlock(ft_mutex);
+			if (!ft_library) {
+				error = FT_Init_FreeType(&ft_library);
+				if (error != 0) {
+					memdelete(fd);
+					ERR_FAIL_V_MSG(false, "FreeType: Error initializing library: '" + String(FT_Error_String(error)) + "'.");
+				}
 #ifdef MODULE_SVG_ENABLED
-			FT_Property_Set(ft_library, "ot-svg", "svg-hooks", get_tvg_svg_in_ot_hooks());
+				FT_Property_Set(ft_library, "ot-svg", "svg-hooks", get_tvg_svg_in_ot_hooks());
 #endif
-		}
-
-		memset(&fd->stream, 0, sizeof(FT_StreamRec));
-		fd->stream.base = (unsigned char *)p_font_data->data_ptr;
-		fd->stream.size = p_font_data->data_size;
-		fd->stream.pos = 0;
-
-		FT_Open_Args fargs;
-		memset(&fargs, 0, sizeof(FT_Open_Args));
-		fargs.memory_base = (unsigned char *)p_font_data->data_ptr;
-		fargs.memory_size = p_font_data->data_size;
-		fargs.flags = FT_OPEN_MEMORY;
-		fargs.stream = &fd->stream;
+			}
 
-		int max_index = 0;
-		FT_Face tmp_face = nullptr;
-		error = FT_Open_Face(ft_library, &fargs, -1, &tmp_face);
-		if (tmp_face && error == 0) {
-			max_index = tmp_face->num_faces - 1;
-		}
-		if (tmp_face) {
-			FT_Done_Face(tmp_face);
-		}
+			memset(&fd->stream, 0, sizeof(FT_StreamRec));
+			fd->stream.base = (unsigned char *)p_font_data->data_ptr;
+			fd->stream.size = p_font_data->data_size;
+			fd->stream.pos = 0;
+
+			FT_Open_Args fargs;
+			memset(&fargs, 0, sizeof(FT_Open_Args));
+			fargs.memory_base = (unsigned char *)p_font_data->data_ptr;
+			fargs.memory_size = p_font_data->data_size;
+			fargs.flags = FT_OPEN_MEMORY;
+			fargs.stream = &fd->stream;
+
+			int max_index = 0;
+			FT_Face tmp_face = nullptr;
+			error = FT_Open_Face(ft_library, &fargs, -1, &tmp_face);
+			if (tmp_face && error == 0) {
+				max_index = tmp_face->num_faces - 1;
+			}
+			if (tmp_face) {
+				FT_Done_Face(tmp_face);
+			}
 
-		error = FT_Open_Face(ft_library, &fargs, CLAMP(p_font_data->face_index, 0, max_index), &fd->face);
-		if (error) {
-			FT_Done_Face(fd->face);
-			fd->face = nullptr;
-			memdelete(fd);
-			ERR_FAIL_V_MSG(false, "FreeType: Error loading font: '" + String(FT_Error_String(error)) + "'.");
+			error = FT_Open_Face(ft_library, &fargs, CLAMP(p_font_data->face_index, 0, max_index), &fd->face);
+			if (error) {
+				FT_Done_Face(fd->face);
+				fd->face = nullptr;
+				memdelete(fd);
+				ERR_FAIL_V_MSG(false, "FreeType: Error loading font: '" + String(FT_Error_String(error)) + "'.");
+			}
 		}
 
 		if (p_font_data->msdf) {
@@ -909,6 +914,8 @@ _FORCE_INLINE_ bool TextServerFallback::_ensure_cache_for_size(FontFallback *p_f
 }
 
 _FORCE_INLINE_ void TextServerFallback::_font_clear_cache(FontFallback *p_font_data) {
+	MutexLock ftlock(ft_mutex);
+
 	for (const KeyValue<Vector2i, FontForSizeFallback *> &E : p_font_data->cache) {
 		memdelete(E.value);
 	}
@@ -1012,6 +1019,8 @@ int64_t TextServerFallback::_font_get_face_count(const RID &p_font_rid) const {
 		fargs.flags = FT_OPEN_MEMORY;
 		fargs.stream = &stream;
 
+		MutexLock ftlock(ft_mutex);
+
 		FT_Face tmp_face = nullptr;
 		error = FT_Open_Face(ft_library, &fargs, -1, &tmp_face);
 		if (error == 0) {
@@ -1393,6 +1402,7 @@ void TextServerFallback::_font_clear_size_cache(const RID &p_font_rid) {
 	ERR_FAIL_COND(!fd);
 
 	MutexLock lock(fd->mutex);
+	MutexLock ftlock(ft_mutex);
 	for (const KeyValue<Vector2i, FontForSizeFallback *> &E : fd->cache) {
 		memdelete(E.value);
 	}
@@ -1404,6 +1414,7 @@ void TextServerFallback::_font_remove_size_cache(const RID &p_font_rid, const Ve
 	ERR_FAIL_COND(!fd);
 
 	MutexLock lock(fd->mutex);
+	MutexLock ftlock(ft_mutex);
 	if (fd->cache.has(p_size)) {
 		memdelete(fd->cache[p_size]);
 		fd->cache.erase(p_size);
diff --git a/modules/text_server_fb/text_server_fb.h b/modules/text_server_fb/text_server_fb.h
index 12ed21ee95..d9e471154d 100644
--- a/modules/text_server_fb/text_server_fb.h
+++ b/modules/text_server_fb/text_server_fb.h
@@ -531,6 +531,8 @@ class TextServerFallback : public TextServerExtension {
 
 	void _realign(ShapedTextDataFallback *p_sd) const;
 
+	Mutex ft_mutex;
+
 protected:
 	static void _bind_methods(){};