Use non-MSDF fallback for MSDF fonts if fallback is a color or non-scalable font.

Author: bruvzg

modules/text_server_adv/text_server_adv.cpp

@@ -5710,10 +5710,25 @@ RID TextServerAdvanced::_find_sys_font_for_text(const RID &p_fdef, const String
 				}
 			}
 
+			bool fb_use_msdf = key.msdf;
+			if (fb_use_msdf) {
+				FontAdvanced *fd = _get_font_data(sysf.rid);
+				if (fd) {
+					MutexLock lock(fd->mutex);
+					Vector2i size = _get_size(fd, 16);
+					FontForSizeAdvanced *ffsd = nullptr;
+					if (_ensure_cache_for_size(fd, size, ffsd)) {
+						if (ffsd && (FT_HAS_COLOR(ffsd->face) || !FT_IS_SCALABLE(ffsd->face))) {
+							fb_use_msdf = false;
+						}
+					}
+				}
+			}
+
 			_font_set_antialiasing(sysf.rid, key.antialiasing);
 			_font_set_disable_embedded_bitmaps(sysf.rid, key.disable_embedded_bitmaps);
 			_font_set_generate_mipmaps(sysf.rid, key.mipmaps);
-			_font_set_multichannel_signed_distance_field(sysf.rid, key.msdf);
+			_font_set_multichannel_signed_distance_field(sysf.rid, fb_use_msdf);
 			_font_set_msdf_pixel_range(sysf.rid, key.msdf_range);
 			_font_set_msdf_size(sysf.rid, key.msdf_source_size);
 			_font_set_fixed_size(sysf.rid, key.fixed_size);

modules/text_server_fb/text_server_fb.cpp

@@ -4461,10 +4461,25 @@ RID TextServerFallback::_find_sys_font_for_text(const RID &p_fdef, const String
 					}
 				}
 
+				bool fb_use_msdf = key.msdf;
+				if (fb_use_msdf) {
+					FontFallback *fd = _get_font_data(sysf.rid);
+					if (fd) {
+						MutexLock lock(fd->mutex);
+						Vector2i size = _get_size(fd, 16);
+						FontForSizeFallback *ffsd = nullptr;
+						if (_ensure_cache_for_size(fd, size, ffsd)) {
+							if (ffsd && (FT_HAS_COLOR(ffsd->face) || !FT_IS_SCALABLE(ffsd->face))) {
+								fb_use_msdf = false;
+							}
+						}
+					}
+				}
+
 				_font_set_antialiasing(sysf.rid, key.antialiasing);
 				_font_set_disable_embedded_bitmaps(sysf.rid, key.disable_embedded_bitmaps);
 				_font_set_generate_mipmaps(sysf.rid, key.mipmaps);
-				_font_set_multichannel_signed_distance_field(sysf.rid, key.msdf);
+				_font_set_multichannel_signed_distance_field(sysf.rid, fb_use_msdf);
 				_font_set_msdf_pixel_range(sysf.rid, key.msdf_range);
 				_font_set_msdf_size(sysf.rid, key.msdf_source_size);
 				_font_set_fixed_size(sysf.rid, key.fixed_size);