From decd5482237714f29edd38fee2717262f5812427 Mon Sep 17 00:00:00 2001
From: Yuri Sizov <yuris@humnom.net>
Date: Tue, 3 Aug 2021 16:52:12 +0300
Subject: Cache EditorResourcePicker's allowed types

---
 editor/editor_resource_picker.cpp | 40 +++++++++++++++++++++++++++++++--------
 1 file changed, 32 insertions(+), 8 deletions(-)

(limited to 'editor/editor_resource_picker.cpp')

diff --git a/editor/editor_resource_picker.cpp b/editor/editor_resource_picker.cpp
index 9977f5f42c..f3965fe7de 100644
--- a/editor/editor_resource_picker.cpp
+++ b/editor/editor_resource_picker.cpp
@@ -36,6 +36,12 @@
 #include "editor_settings.h"
 #include "filesystem_dock.h"
 
+HashMap<StringName, List<StringName>> EditorResourcePicker::allowed_types_cache;
+
+void EditorResourcePicker::clear_caches() {
+	allowed_types_cache.clear();
+}
+
 void EditorResourcePicker::_update_resource() {
 	preview_rect->set_texture(Ref<Texture2D>());
 	assign_button->set_custom_minimum_size(Size2(1, 1));
@@ -462,17 +468,31 @@ void EditorResourcePicker::_get_allowed_types(bool p_with_convert, Set<String> *
 		String base = allowed_types[i].strip_edges();
 		p_vector->insert(base);
 
-		List<StringName> inheriters;
+		// If we hit a familiar base type, take all the data from cache.
+		if (allowed_types_cache.has(base)) {
+			List<StringName> allowed_subtypes = allowed_types_cache[base];
+			for (const StringName &subtype_name : allowed_subtypes) {
+				p_vector->insert(subtype_name);
+			}
+		} else {
+			List<StringName> allowed_subtypes;
 
-		ClassDB::get_inheriters_from_class(base, &inheriters);
-		for (const StringName &E : inheriters) {
-			p_vector->insert(E);
-		}
+			List<StringName> inheriters;
+			ClassDB::get_inheriters_from_class(base, &inheriters);
+			for (const StringName &subtype_name : inheriters) {
+				p_vector->insert(subtype_name);
+				allowed_subtypes.push_back(subtype_name);
+			}
 
-		for (const StringName &E : global_classes) {
-			if (EditorNode::get_editor_data().script_class_is_parent(E, base)) {
-				p_vector->insert(E);
+			for (const StringName &subtype_name : global_classes) {
+				if (EditorNode::get_editor_data().script_class_is_parent(subtype_name, base)) {
+					p_vector->insert(subtype_name);
+					allowed_subtypes.push_back(subtype_name);
+				}
 			}
+
+			// Store the subtypes of the base type in the cache for future use.
+			allowed_types_cache[base] = allowed_subtypes;
 		}
 
 		if (p_with_convert) {
@@ -706,6 +726,10 @@ void EditorResourcePicker::set_base_type(const String &p_base_type) {
 			String class_str = (custom_class == StringName() ? edited_resource->get_class() : vformat("%s (%s)", custom_class, edited_resource->get_class()));
 			WARN_PRINT(vformat("Value mismatch between the new base type of this EditorResourcePicker, '%s', and the type of the value it already has, '%s'.", base_type, class_str));
 		}
+	} else {
+		// Call the method to build the cache immediately.
+		Set<String> allowed_types;
+		_get_allowed_types(false, &allowed_types);
 	}
 }
 
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