[Label] Add MSDF pixel range/outline configuration warning.

Author: bruvzg

scene/gui/label.cpp

@@ -657,6 +657,43 @@ PackedStringArray Label::get_configuration_warnings() const {
 		}
 	}
 
+	Ref<FontFile> ff = font;
+	if (ff.is_valid() && ff->is_multichannel_signed_distance_field()) {
+		bool has_settings = settings.is_valid();
+		int font_size = settings.is_valid() ? settings->get_font_size() : theme_cache.font_size;
+		int outline_size = has_settings ? settings->get_outline_size() : theme_cache.font_outline_size;
+		Vector<LabelSettings::StackedOutlineData> stacked_outline_datas = has_settings ? settings->get_stacked_outline_data() : Vector<LabelSettings::StackedOutlineData>();
+		Vector<LabelSettings::StackedShadowData> stacked_shadow_datas = has_settings ? settings->get_stacked_shadow_data() : Vector<LabelSettings::StackedShadowData>();
+		int max_outline_draw_size = outline_size;
+		if (stacked_outline_datas.size() != 0) {
+			int draw_iterations = stacked_outline_datas.size();
+			for (int j = 0; j < draw_iterations; j++) {
+				int stacked_outline_size = stacked_outline_datas[j].size;
+				if (stacked_outline_size <= 0) {
+					continue;
+				}
+				max_outline_draw_size += stacked_outline_size;
+			}
+		}
+		if (stacked_shadow_datas.size() != 0) {
+			int draw_iterations = stacked_shadow_datas.size();
+			for (int j = 0; j < draw_iterations; j++) {
+				LabelSettings::StackedShadowData stacked_shadow_data = stacked_shadow_datas[j];
+				if (stacked_shadow_data.outline_size > 0) {
+					max_outline_draw_size = MAX(max_outline_draw_size, stacked_shadow_data.outline_size);
+				}
+			}
+		}
+		float scale = (float)font_size / (float)ff->get_msdf_size();
+		float ol = (float)max_outline_draw_size / scale / 4.0;
+		float pxr = (float)ff->get_msdf_pixel_range() / 2.0 - 1.0;
+		float r_pxr = (ol + 1.0) * 2.0;
+
+		if (ol > pxr) {
+			warnings.push_back(vformat(RTR("MSDF font pixel range is too small, some outlines/shadows will not render. Set MSDF pixel range to be at least %d to render all outlines/shadows."), Math::ceil(r_pxr)));
+		}
+	}
+
 	return warnings;
 }
 
@@ -857,6 +894,7 @@ void Label::_notification(int p_what) {
 		case NOTIFICATION_THEME_CHANGED: {
 			font_dirty = true;
 			queue_redraw();
+			update_configuration_warnings();
 		} break;
 
 		case NOTIFICATION_RESIZED: {
@@ -1070,6 +1108,7 @@ void Label::set_text(const String &p_string) {
 void Label::_invalidate() {
 	font_dirty = true;
 	queue_redraw();
+	update_configuration_warnings();
 }
 
 void Label::set_label_settings(const Ref<LabelSettings> &p_settings) {
@@ -1082,6 +1121,7 @@ void Label::set_label_settings(const Ref<LabelSettings> &p_settings) {
 			settings->connect_changed(callable_mp(this, &Label::_invalidate), CONNECT_REFERENCE_COUNTED);
 		}
 		_invalidate();
+		update_configuration_warnings();
 	}
 }