Add thumnails to the tree view

11 files changed, 203 insertions, 140 deletions

diff --git a/editor/editor_file_dialog.cpp b/editor/editor_file_dialog.cpp
index 3659a06bb7..d0007bd5d1 100644
--- a/editor/editor_file_dialog.cpp
+++ b/editor/editor_file_dialog.cpp
@@ -269,7 +269,7 @@ void EditorFileDialog::_post_popup() {
 	set_process_unhandled_input(true);
 }
 
-void EditorFileDialog::_thumbnail_result(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata) {
+void EditorFileDialog::_thumbnail_result(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata) {
 
 	if (display_mode == DISPLAY_LIST || p_preview.is_null())
 		return;
@@ -284,7 +284,7 @@ void EditorFileDialog::_thumbnail_result(const String &p_path, const Ref<Texture
 	}
 }
 
-void EditorFileDialog::_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata) {
+void EditorFileDialog::_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata) {
 
 	set_process(false);
 	preview_waiting = false;
diff --git a/editor/editor_file_dialog.h b/editor/editor_file_dialog.h
index 61eeff9162..56cefb9a47 100644
--- a/editor/editor_file_dialog.h
+++ b/editor/editor_file_dialog.h
@@ -190,8 +190,8 @@ private:
 	void _save_to_recent();
 	//callback function is callback(String p_path,Ref<Texture> preview,Variant udata) preview null if could not load
 
-	void _thumbnail_result(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata);
-	void _thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata);
+	void _thumbnail_result(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata);
+	void _thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata);
 	void _request_single_thumbnail(const String &p_path);
 
 	void _unhandled_input(const Ref<InputEvent> &p_event);
diff --git a/editor/editor_node.cpp b/editor/editor_node.cpp
index b652a25b6b..1449be9724 100644
--- a/editor/editor_node.cpp
+++ b/editor/editor_node.cpp
@@ -3915,7 +3915,7 @@ void EditorNode::_reposition_active_tab(int idx_to) {
 	_update_scene_tabs();
 }
 
-void EditorNode::_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata) {
+void EditorNode::_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata) {
 	int p_tab = p_udata.operator signed int();
 	if (p_preview.is_valid()) {
 		Rect2 rect = scene_tabs->get_tab_rect(p_tab);
diff --git a/editor/editor_node.h b/editor/editor_node.h
index 5a17ab6ca0..93f5d499b7 100644
--- a/editor/editor_node.h
+++ b/editor/editor_node.h
@@ -535,7 +535,7 @@ private:
 	void _scene_tab_exit();
 	void _scene_tab_input(const Ref<InputEvent> &p_input);
 	void _reposition_active_tab(int idx_to);
-	void _thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata);
+	void _thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata);
 	void _scene_tab_script_edited(int p_tab);
 
 	Dictionary _get_main_scene_state();
diff --git a/editor/editor_resource_preview.cpp b/editor/editor_resource_preview.cpp
index edfee595ea..ee528401ad 100644
--- a/editor/editor_resource_preview.cpp
+++ b/editor/editor_resource_preview.cpp
@@ -30,11 +30,14 @@
 
 #include "editor_resource_preview.h"
 
+#include "core/method_bind_ext.gen.inc"
+
 #include "core/io/resource_loader.h"
 #include "core/io/resource_saver.h"
 #include "core/message_queue.h"
 #include "core/os/file_access.h"
 #include "core/project_settings.h"
+#include "editor_node.h"
 #include "editor_scale.h"
 #include "editor_settings.h"
 
@@ -46,32 +49,37 @@ bool EditorResourcePreviewGenerator::handles(const String &p_type) const {
 	ERR_EXPLAIN("EditorResourcePreviewGenerator::handles needs to be overridden");
 	ERR_FAIL_V(false);
 }
-Ref<Texture> EditorResourcePreviewGenerator::generate(const RES &p_from) const {
+
+Ref<Texture> EditorResourcePreviewGenerator::generate(const RES &p_from, const Size2 p_size) const {
 
 	if (get_script_instance() && get_script_instance()->has_method("generate")) {
-		return get_script_instance()->call("generate", p_from);
+		return get_script_instance()->call("generate", p_from, p_size);
 	}
 	ERR_EXPLAIN("EditorResourcePreviewGenerator::generate needs to be overridden");
 	ERR_FAIL_V(Ref<Texture>());
 }
 
-Ref<Texture> EditorResourcePreviewGenerator::generate_from_path(const String &p_path) const {
+Ref<Texture> EditorResourcePreviewGenerator::generate_from_path(const String &p_path, const Size2 p_size) const {
 
 	if (get_script_instance() && get_script_instance()->has_method("generate_from_path")) {
-		return get_script_instance()->call("generate_from_path", p_path);
+		return get_script_instance()->call("generate_from_path", p_path, p_size);
 	}
 
 	RES res = ResourceLoader::load(p_path);
 	if (!res.is_valid())
 		return res;
-	return generate(res);
+	return generate(res, p_size);
+}
+
+bool EditorResourcePreviewGenerator::should_generate_small_preview() const {
+	return false;
 }
 
 void EditorResourcePreviewGenerator::_bind_methods() {
 
 	ClassDB::add_virtual_method(get_class_static(), MethodInfo(Variant::BOOL, "handles", PropertyInfo(Variant::STRING, "type")));
-	ClassDB::add_virtual_method(get_class_static(), MethodInfo(CLASS_INFO(Texture), "generate", PropertyInfo(Variant::OBJECT, "from", PROPERTY_HINT_RESOURCE_TYPE, "Resource")));
-	ClassDB::add_virtual_method(get_class_static(), MethodInfo(CLASS_INFO(Texture), "generate_from_path", PropertyInfo(Variant::STRING, "path", PROPERTY_HINT_FILE)));
+	ClassDB::add_virtual_method(get_class_static(), MethodInfo(CLASS_INFO(Texture), "generate", PropertyInfo(Variant::OBJECT, "from", PROPERTY_HINT_RESOURCE_TYPE, "Resource"), PropertyInfo(Variant::VECTOR2, "size")));
+	ClassDB::add_virtual_method(get_class_static(), MethodInfo(CLASS_INFO(Texture), "generate_from_path", PropertyInfo(Variant::STRING, "path", PROPERTY_HINT_FILE), PropertyInfo(Variant::VECTOR2, "size")));
 }
 
 EditorResourcePreviewGenerator::EditorResourcePreviewGenerator() {
@@ -85,7 +93,7 @@ void EditorResourcePreview::_thread_func(void *ud) {
 	erp->_thread();
 }
 
-void EditorResourcePreview::_preview_ready(const String &p_str, const Ref<Texture> &p_texture, ObjectID id, const StringName &p_func, const Variant &p_ud) {
+void EditorResourcePreview::_preview_ready(const String &p_str, const Ref<Texture> &p_texture, const Ref<Texture> &p_small_texture, ObjectID id, const StringName &p_func, const Variant &p_ud) {
 
 	preview_mutex->lock();
 
@@ -103,6 +111,7 @@ void EditorResourcePreview::_preview_ready(const String &p_str, const Ref<Textur
 	Item item;
 	item.order = order++;
 	item.preview = p_texture;
+	item.small_preview = p_small_texture;
 	item.last_hash = hash;
 	item.modified_time = modified_time;
 
@@ -110,11 +119,10 @@ void EditorResourcePreview::_preview_ready(const String &p_str, const Ref<Textur
 
 	preview_mutex->unlock();
 
-	MessageQueue::get_singleton()->push_call(id, p_func, path, p_texture, p_ud);
+	MessageQueue::get_singleton()->push_call(id, p_func, path, p_texture, p_small_texture, p_ud);
 }
 
-Ref<Texture> EditorResourcePreview::_generate_preview(const QueueItem &p_item, const String &cache_base) {
-
+void EditorResourcePreview::_generate_preview(Ref<ImageTexture> &r_texture, Ref<ImageTexture> &r_small_texture, const QueueItem &p_item, const String &cache_base) {
 	String type;
 
 	if (p_item.resource.is_valid())
@@ -122,40 +130,59 @@ Ref<Texture> EditorResourcePreview::_generate_preview(const QueueItem &p_item, c
 	else
 		type = ResourceLoader::get_resource_type(p_item.path);
 
-	if (type == "")
-		return Ref<Texture>(); //could not guess type
+	if (type == "") {
+		r_texture = Ref<ImageTexture>();
+		r_small_texture = Ref<ImageTexture>();
+		return; //could not guess type
+	}
 
-	Ref<Texture> generated;
+	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
+	thumbnail_size *= EDSCALE;
 
-	for (int i = 0; i < preview_generators.size(); i++) {
+	r_texture = Ref<ImageTexture>();
+	r_small_texture = Ref<ImageTexture>();
 
+	for (int i = 0; i < preview_generators.size(); i++) {
 		if (!preview_generators[i]->handles(type))
 			continue;
+
+		Ref<Texture> generated;
 		if (p_item.resource.is_valid()) {
-			generated = preview_generators[i]->generate(p_item.resource);
+			generated = preview_generators[i]->generate(p_item.resource, Vector2(thumbnail_size, thumbnail_size));
 		} else {
-			generated = preview_generators[i]->generate_from_path(p_item.path);
+			generated = preview_generators[i]->generate_from_path(p_item.path, Vector2(thumbnail_size, thumbnail_size));
 		}
+		r_texture = generated;
 
+		if (preview_generators[i]->should_generate_small_preview()) {
+			int small_thumbnail_size = EditorNode::get_singleton()->get_theme_base()->get_icon("Object", "EditorIcons")->get_width(); // Kind of a workaround to retreive the default icon size
+			small_thumbnail_size *= EDSCALE;
+
+			Ref<Image> small_image = r_texture->get_data();
+			small_image->resize(small_thumbnail_size, small_thumbnail_size, Image::INTERPOLATE_CUBIC);
+			r_small_texture.instance();
+			r_small_texture->create_from_image(small_image);
+		}
 		break;
 	}
 
 	if (!p_item.resource.is_valid()) {
 		// cache the preview in case it's a resource on disk
-		if (generated.is_valid()) {
-			int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-			thumbnail_size *= EDSCALE;
+		if (r_texture.is_valid()) {
 			//wow it generated a preview... save cache
-			ResourceSaver::save(cache_base + ".png", generated);
+			bool has_small_texture = r_small_texture.is_valid();
+			ResourceSaver::save(cache_base + ".png", r_texture);
+			if (has_small_texture) {
+				ResourceSaver::save(cache_base + "_small.png", r_small_texture);
+			}
 			FileAccess *f = FileAccess::open(cache_base + ".txt", FileAccess::WRITE);
 			f->store_line(itos(thumbnail_size));
+			f->store_line(itos(has_small_texture));
 			f->store_line(itos(FileAccess::get_modified_time(p_item.path)));
 			f->store_line(FileAccess::get_md5(p_item.path));
 			memdelete(f);
 		}
 	}
-
-	return generated;
 }
 
 void EditorResourcePreview::_thread() {
@@ -177,7 +204,7 @@ void EditorResourcePreview::_thread() {
 					path += ":" + itos(cache[item.path].last_hash); //keep last hash (see description of what this is in condition below)
 				}
 
-				_preview_ready(path, cache[item.path].preview, item.id, item.function, item.userdata);
+				_preview_ready(path, cache[item.path].preview, cache[item.path].small_preview, item.id, item.function, item.userdata);
 
 				preview_mutex->unlock();
 			} else {
@@ -185,15 +212,17 @@ void EditorResourcePreview::_thread() {
 				preview_mutex->unlock();
 
 				Ref<ImageTexture> texture;
+				Ref<ImageTexture> small_texture;
 
 				int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
 				thumbnail_size *= EDSCALE;
 
 				if (item.resource.is_valid()) {
 
-					texture = _generate_preview(item, String());
+					_generate_preview(texture, small_texture, item, String());
+
 					//adding hash to the end of path (should be ID:<objid>:<hash>) because of 5 argument limit to call_deferred
-					_preview_ready(item.path + ":" + itos(item.resource->hash_edited_version()), texture, item.id, item.function, item.userdata);
+					_preview_ready(item.path + ":" + itos(item.resource->hash_edited_version()), texture, small_texture, item.id, item.function, item.userdata);
 
 				} else {
 
@@ -207,12 +236,13 @@ void EditorResourcePreview::_thread() {
 					FileAccess *f = FileAccess::open(file, FileAccess::READ);
 					if (!f) {
 
-						//generate
-						texture = _generate_preview(item, cache_base);
+						// No cache found, generate
+						_generate_preview(texture, small_texture, item, cache_base);
 					} else {
 
 						uint64_t modtime = FileAccess::get_modified_time(item.path);
 						int tsize = f->get_line().to_int64();
+						bool has_small_texture = f->get_line().to_int();
 						uint64_t last_modtime = f->get_line().to_int64();
 
 						bool cache_valid = true;
@@ -236,6 +266,7 @@ void EditorResourcePreview::_thread() {
 
 								f = FileAccess::open(file, FileAccess::WRITE);
 								f->store_line(itos(modtime));
+								f->store_line(itos(has_small_texture));
 								f->store_line(md5);
 								memdelete(f);
 							}
@@ -243,12 +274,12 @@ void EditorResourcePreview::_thread() {
 							memdelete(f);
 						}
 
-						//cache_valid = false;
-
 						if (cache_valid) {
 
 							Ref<Image> img;
 							img.instance();
+							Ref<Image> small_img;
+							small_img.instance();
 
 							if (img->load(cache_base + ".png") != OK) {
 								cache_valid = false;
@@ -256,16 +287,24 @@ void EditorResourcePreview::_thread() {
 
 								texture.instance();
 								texture->create_from_image(img, Texture::FLAG_FILTER);
+
+								if (has_small_texture) {
+									if (small_img->load(cache_base + "_small.png") != OK) {
+										cache_valid = false;
+									} else {
+										small_texture.instance();
+										small_texture->create_from_image(small_img, Texture::FLAG_FILTER);
+									}
+								}
 							}
 						}
 
 						if (!cache_valid) {
 
-							texture = _generate_preview(item, cache_base);
+							_generate_preview(texture, small_texture, item, cache_base);
 						}
 					}
-
-					_preview_ready(item.path, texture, item.id, item.function, item.userdata);
+					_preview_ready(item.path, texture, small_texture, item.id, item.function, item.userdata);
 				}
 			}
 
@@ -287,7 +326,7 @@ void EditorResourcePreview::queue_edited_resource_preview(const Ref<Resource> &p
 	if (cache.has(path_id) && cache[path_id].last_hash == p_res->hash_edited_version()) {
 
 		cache[path_id].order = order++;
-		p_receiver->call_deferred(p_receiver_func, path_id, cache[path_id].preview, p_userdata);
+		p_receiver->call_deferred(p_receiver_func, path_id, cache[path_id].preview, cache[path_id].small_preview, p_userdata);
 		preview_mutex->unlock();
 		return;
 	}
@@ -312,7 +351,7 @@ void EditorResourcePreview::queue_resource_preview(const String &p_path, Object
 	preview_mutex->lock();
 	if (cache.has(p_path)) {
 		cache[p_path].order = order++;
-		p_receiver->call_deferred(p_receiver_func, p_path, cache[p_path].preview, p_userdata);
+		p_receiver->call_deferred(p_receiver_func, p_path, cache[p_path].preview, cache[p_path].small_preview, p_userdata);
 		preview_mutex->unlock();
 		return;
 	}
diff --git a/editor/editor_resource_preview.h b/editor/editor_resource_preview.h
index 434b26e901..a3417cdf60 100644
--- a/editor/editor_resource_preview.h
+++ b/editor/editor_resource_preview.h
@@ -63,8 +63,10 @@ protected:
 
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
-	virtual Ref<Texture> generate_from_path(const String &p_path) const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
+	virtual Ref<Texture> generate_from_path(const String &p_path, const Size2 p_size) const;
+
+	virtual bool should_generate_small_preview() const;
 
 	EditorResourcePreviewGenerator();
 };
@@ -92,6 +94,7 @@ class EditorResourcePreview : public Node {
 
 	struct Item {
 		Ref<Texture> preview;
+		Ref<Texture> small_preview;
 		int order;
 		uint32_t last_hash;
 		uint64_t modified_time;
@@ -101,8 +104,8 @@ class EditorResourcePreview : public Node {
 
 	Map<String, Item> cache;
 
-	void _preview_ready(const String &p_str, const Ref<Texture> &p_texture, ObjectID id, const StringName &p_func, const Variant &p_ud);
-	Ref<Texture> _generate_preview(const QueueItem &p_item, const String &cache_base);
+	void _preview_ready(const String &p_str, const Ref<Texture> &p_texture, const Ref<Texture> &p_small_texture, ObjectID id, const StringName &p_func, const Variant &p_ud);
+	void _generate_preview(Ref<ImageTexture> &r_texture, Ref<ImageTexture> &r_small_texture, const QueueItem &p_item, const String &cache_base);
 
 	static void _thread_func(void *ud);
 	void _thread();
diff --git a/editor/editor_settings.cpp b/editor/editor_settings.cpp
index d649ec2128..696f389b84 100644
--- a/editor/editor_settings.cpp
+++ b/editor/editor_settings.cpp
@@ -510,9 +510,9 @@ void EditorSettings::_load_defaults(Ref<ConfigFile> p_extra_config) {
 	_initial_set("filesystem/file_dialog/show_hidden_files", false);
 	_initial_set("filesystem/file_dialog/display_mode", 0);
 	hints["filesystem/file_dialog/display_mode"] = PropertyInfo(Variant::INT, "filesystem/file_dialog/display_mode", PROPERTY_HINT_ENUM, "Thumbnails,List");
+
 	_initial_set("filesystem/file_dialog/thumbnail_size", 64);
 	hints["filesystem/file_dialog/thumbnail_size"] = PropertyInfo(Variant::INT, "filesystem/file_dialog/thumbnail_size", PROPERTY_HINT_RANGE, "32,128,16");
-
 	_initial_set("docks/filesystem/disable_split", false);
 	_initial_set("docks/filesystem/split_mode_minimum_height", 600);
 	_initial_set("docks/filesystem/display_files_in_tree", false);
diff --git a/editor/filesystem_dock.cpp b/editor/filesystem_dock.cpp
index 39ded5ca5a..b406242759 100644
--- a/editor/filesystem_dock.cpp
+++ b/editor/filesystem_dock.cpp
@@ -98,6 +98,10 @@ bool FileSystemDock::_create_tree(TreeItem *p_parent, EditorFileSystemDirectory
 			if (path == file_metadata) {
 				file_item->select(0);
 			}
+			Array udata;
+			udata.push_back(tree_update_id);
+			udata.push_back(file_item);
+			EditorResourcePreview::get_singleton()->queue_resource_preview(file_metadata, this, "_tree_thumbnail_done", udata);
 		}
 	}
 
@@ -133,6 +137,7 @@ void FileSystemDock::_update_tree(bool keep_collapse_state, bool p_uncollapse_ro
 
 	// Recreate the tree
 	tree->clear();
+	tree_update_id++;
 	updating_tree = true;
 	TreeItem *root = tree->create_item();
 
@@ -496,10 +501,9 @@ void FileSystemDock::navigate_to_path(const String &p_path) {
 	}
 }
 
-void FileSystemDock::_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata) {
+void FileSystemDock::_file_list_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata) {
 
 	if ((file_list_vb->is_visible_in_tree() || path == p_path.get_base_dir()) && p_preview.is_valid()) {
-
 		Array uarr = p_udata;
 		int idx = uarr[0];
 		String file = uarr[1];
@@ -508,6 +512,18 @@ void FileSystemDock::_thumbnail_done(const String &p_path, const Ref<Texture> &p
 	}
 }
 
+void FileSystemDock::_tree_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata) {
+	if (p_small_preview.is_valid()) {
+		Array uarr = p_udata;
+		if (tree_update_id == (int)uarr[0]) {
+			TreeItem *file_item = Object::cast_to<TreeItem>(uarr[1]);
+			if (file_item) {
+				file_item->set_icon(0, p_small_preview);
+			}
+		}
+	}
+}
+
 void FileSystemDock::_update_file_list_display_mode_button() {
 
 	if (button_file_list_display_mode->is_pressed()) {
@@ -707,7 +723,7 @@ void FileSystemDock::_update_files(bool p_keep_selection) {
 				udata.resize(2);
 				udata[0] = item_index;
 				udata[1] = fname;
-				EditorResourcePreview::get_singleton()->queue_resource_preview(fpath, this, "_thumbnail_done", udata);
+				EditorResourcePreview::get_singleton()->queue_resource_preview(fpath, this, "_file_list_thumbnail_done", udata);
 			}
 		} else {
 			files->add_item(fname, type_icon, true);
@@ -792,7 +808,7 @@ void FileSystemDock::_preview_invalidated(const String &p_path) {
 				udata.resize(2);
 				udata[0] = i;
 				udata[1] = files->get_item_text(i);
-				EditorResourcePreview::get_singleton()->queue_resource_preview(p_path, this, "_thumbnail_done", udata);
+				EditorResourcePreview::get_singleton()->queue_resource_preview(p_path, this, "_file_list_thumbnail_done", udata);
 				break;
 			}
 		}
@@ -2072,7 +2088,8 @@ void FileSystemDock::_bind_methods() {
 	ClassDB::bind_method(D_METHOD("_file_list_rmb_select"), &FileSystemDock::_file_list_rmb_select);
 	ClassDB::bind_method(D_METHOD("_file_list_rmb_pressed"), &FileSystemDock::_file_list_rmb_pressed);
 
-	ClassDB::bind_method(D_METHOD("_thumbnail_done"), &FileSystemDock::_thumbnail_done);
+	ClassDB::bind_method(D_METHOD("_file_list_thumbnail_done"), &FileSystemDock::_file_list_thumbnail_done);
+	ClassDB::bind_method(D_METHOD("_tree_thumbnail_done"), &FileSystemDock::_tree_thumbnail_done);
 	ClassDB::bind_method(D_METHOD("_file_list_activate_file"), &FileSystemDock::_file_list_activate_file);
 	ClassDB::bind_method(D_METHOD("_tree_activate_file"), &FileSystemDock::_tree_activate_file);
 	ClassDB::bind_method(D_METHOD("_select_file"), &FileSystemDock::_select_file);
@@ -2316,6 +2333,7 @@ FileSystemDock::FileSystemDock(EditorNode *p_editor) {
 	new_resource_dialog->connect("create", this, "_resource_created");
 
 	updating_tree = false;
+	tree_update_id = 0;
 	initialized = false;
 	import_dock_needs_update = false;
 
diff --git a/editor/filesystem_dock.h b/editor/filesystem_dock.h
index 40e3f60136..34a2666ecb 100644
--- a/editor/filesystem_dock.h
+++ b/editor/filesystem_dock.h
@@ -164,6 +164,7 @@ private:
 	bool initialized;
 
 	bool updating_tree;
+	int tree_update_id;
 	Tree *tree; //directories
 	ItemList *files;
 	bool import_dock_needs_update;
@@ -250,7 +251,8 @@ private:
 	String _get_drag_target_folder(const Point2 &p_point, Control *p_from) const;
 
 	void _preview_invalidated(const String &p_path);
-	void _thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Variant &p_udata);
+	void _file_list_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata);
+	void _tree_thumbnail_done(const String &p_path, const Ref<Texture> &p_preview, const Ref<Texture> &p_small_preview, const Variant &p_udata);
 
 	void _update_display_mode();
 
diff --git a/editor/plugins/editor_preview_plugins.cpp b/editor/plugins/editor_preview_plugins.cpp
index 72a746e95b..7f83865777 100644
--- a/editor/plugins/editor_preview_plugins.cpp
+++ b/editor/plugins/editor_preview_plugins.cpp
@@ -78,7 +78,11 @@ bool EditorTexturePreviewPlugin::handles(const String &p_type) const {
 	return ClassDB::is_parent_class(p_type, "Texture");
 }
 
-Ref<Texture> EditorTexturePreviewPlugin::generate(const RES &p_from) const {
+bool EditorTexturePreviewPlugin::should_generate_small_preview() const {
+	return true;
+}
+
+Ref<Texture> EditorTexturePreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
 	Ref<Image> img;
 	Ref<AtlasTexture> atex = p_from;
@@ -100,8 +104,6 @@ Ref<Texture> EditorTexturePreviewPlugin::generate(const RES &p_from) const {
 	img = img->duplicate();
 	img->clear_mipmaps();
 
-	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-	thumbnail_size *= EDSCALE;
 	if (img->is_compressed()) {
 		if (img->decompress() != OK)
 			return Ref<Texture>();
@@ -109,22 +111,15 @@ Ref<Texture> EditorTexturePreviewPlugin::generate(const RES &p_from) const {
 		img->convert(Image::FORMAT_RGBA8);
 	}
 
-	int width, height;
-	if (img->get_width() > thumbnail_size && img->get_width() >= img->get_height()) {
-
-		width = thumbnail_size;
-		height = img->get_height() * thumbnail_size / img->get_width();
-	} else if (img->get_height() > thumbnail_size && img->get_height() >= img->get_width()) {
-
-		height = thumbnail_size;
-		width = img->get_width() * thumbnail_size / img->get_height();
-	} else {
-
-		width = img->get_width();
-		height = img->get_height();
+	Vector2 new_size = img->get_size();
+	if (new_size.x > p_size.x) {
+		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
 	}
+	if (new_size.y > p_size.y) {
+		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
+	}
+	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
 
-	img->resize(width, height);
 	post_process_preview(img);
 
 	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
@@ -143,7 +138,7 @@ bool EditorImagePreviewPlugin::handles(const String &p_type) const {
 	return p_type == "Image";
 }
 
-Ref<Texture> EditorImagePreviewPlugin::generate(const RES &p_from) const {
+Ref<Texture> EditorImagePreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
 	Ref<Image> img = p_from;
 
@@ -153,8 +148,6 @@ Ref<Texture> EditorImagePreviewPlugin::generate(const RES &p_from) const {
 	img = img->duplicate();
 	img->clear_mipmaps();
 
-	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-	thumbnail_size *= EDSCALE;
 	if (img->is_compressed()) {
 		if (img->decompress() != OK)
 			return Ref<Image>();
@@ -162,22 +155,15 @@ Ref<Texture> EditorImagePreviewPlugin::generate(const RES &p_from) const {
 		img->convert(Image::FORMAT_RGBA8);
 	}
 
-	int width, height;
-	if (img->get_width() > thumbnail_size && img->get_width() >= img->get_height()) {
-
-		width = thumbnail_size;
-		height = img->get_height() * thumbnail_size / img->get_width();
-	} else if (img->get_height() > thumbnail_size && img->get_height() >= img->get_width()) {
-
-		height = thumbnail_size;
-		width = img->get_width() * thumbnail_size / img->get_height();
-	} else {
-
-		width = img->get_width();
-		height = img->get_height();
+	Vector2 new_size = img->get_size();
+	if (new_size.x > p_size.x) {
+		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
+	}
+	if (new_size.y > p_size.y) {
+		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
 	}
+	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
 
-	img->resize(width, height);
 	post_process_preview(img);
 
 	Ref<ImageTexture> ptex;
@@ -190,6 +176,9 @@ Ref<Texture> EditorImagePreviewPlugin::generate(const RES &p_from) const {
 EditorImagePreviewPlugin::EditorImagePreviewPlugin() {
 }
 
+bool EditorImagePreviewPlugin::should_generate_small_preview() const {
+	return true;
+}
 ////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////
 bool EditorBitmapPreviewPlugin::handles(const String &p_type) const {
@@ -197,7 +186,7 @@ bool EditorBitmapPreviewPlugin::handles(const String &p_type) const {
 	return ClassDB::is_parent_class(p_type, "BitMap");
 }
 
-Ref<Texture> EditorBitmapPreviewPlugin::generate(const RES &p_from) const {
+Ref<Texture> EditorBitmapPreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
 	Ref<BitMap> bm = p_from;
 
@@ -227,8 +216,6 @@ Ref<Texture> EditorBitmapPreviewPlugin::generate(const RES &p_from) const {
 	img.instance();
 	img->create(bm->get_size().width, bm->get_size().height, 0, Image::FORMAT_L8, data);
 
-	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-	thumbnail_size *= EDSCALE;
 	if (img->is_compressed()) {
 		if (img->decompress() != OK)
 			return Ref<Texture>();
@@ -236,22 +223,15 @@ Ref<Texture> EditorBitmapPreviewPlugin::generate(const RES &p_from) const {
 		img->convert(Image::FORMAT_RGBA8);
 	}
 
-	int width, height;
-	if (img->get_width() > thumbnail_size && img->get_width() >= img->get_height()) {
-
-		width = thumbnail_size;
-		height = img->get_height() * thumbnail_size / img->get_width();
-	} else if (img->get_height() > thumbnail_size && img->get_height() >= img->get_width()) {
-
-		height = thumbnail_size;
-		width = img->get_width() * thumbnail_size / img->get_height();
-	} else {
-
-		width = img->get_width();
-		height = img->get_height();
+	Vector2 new_size = img->get_size();
+	if (new_size.x > p_size.x) {
+		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
+	}
+	if (new_size.y > p_size.y) {
+		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
 	}
+	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
 
-	img->resize(width, height);
 	post_process_preview(img);
 
 	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
@@ -260,6 +240,10 @@ Ref<Texture> EditorBitmapPreviewPlugin::generate(const RES &p_from) const {
 	return ptex;
 }
 
+bool EditorBitmapPreviewPlugin::should_generate_small_preview() const {
+	return true;
+}
+
 EditorBitmapPreviewPlugin::EditorBitmapPreviewPlugin() {
 }
 
@@ -269,12 +253,12 @@ bool EditorPackedScenePreviewPlugin::handles(const String &p_type) const {
 
 	return ClassDB::is_parent_class(p_type, "PackedScene");
 }
-Ref<Texture> EditorPackedScenePreviewPlugin::generate(const RES &p_from) const {
+Ref<Texture> EditorPackedScenePreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
-	return generate_from_path(p_from->get_path());
+	return generate_from_path(p_from->get_path(), p_size);
 }
 
-Ref<Texture> EditorPackedScenePreviewPlugin::generate_from_path(const String &p_path) const {
+Ref<Texture> EditorPackedScenePreviewPlugin::generate_from_path(const String &p_path, const Size2 p_size) const {
 
 	String temp_path = EditorSettings::get_singleton()->get_cache_dir();
 	String cache_base = ProjectSettings::get_singleton()->globalize_path(p_path).md5_text();
@@ -323,7 +307,11 @@ bool EditorMaterialPreviewPlugin::handles(const String &p_type) const {
 	return ClassDB::is_parent_class(p_type, "Material"); //any material
 }
 
-Ref<Texture> EditorMaterialPreviewPlugin::generate(const RES &p_from) const {
+bool EditorMaterialPreviewPlugin::should_generate_small_preview() const {
+	return true;
+}
+
+Ref<Texture> EditorMaterialPreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
 	Ref<Material> material = p_from;
 	ERR_FAIL_COND_V(material.is_null(), Ref<Texture>());
@@ -346,10 +334,9 @@ Ref<Texture> EditorMaterialPreviewPlugin::generate(const RES &p_from) const {
 
 		ERR_FAIL_COND_V(!img.is_valid(), Ref<ImageTexture>());
 
-		int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-		thumbnail_size *= EDSCALE;
 		img->convert(Image::FORMAT_RGBA8);
-		img->resize(thumbnail_size, thumbnail_size);
+		int thumbnail_size = MAX(p_size.x, p_size.y);
+		img->resize(thumbnail_size, thumbnail_size, Image::INTERPOLATE_CUBIC);
 		post_process_preview(img);
 		Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
 		ptex->create_from_image(img, 0);
@@ -490,7 +477,7 @@ bool EditorScriptPreviewPlugin::handles(const String &p_type) const {
 	return ClassDB::is_parent_class(p_type, "Script");
 }
 
-Ref<Texture> EditorScriptPreviewPlugin::generate(const RES &p_from) const {
+Ref<Texture> EditorScriptPreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
 	Ref<Script> scr = p_from;
 	if (scr.is_null())
@@ -512,10 +499,9 @@ Ref<Texture> EditorScriptPreviewPlugin::generate(const RES &p_from) const {
 
 	int line = 0;
 	int col = 0;
-	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-	thumbnail_size *= EDSCALE;
 	Ref<Image> img;
 	img.instance();
+	int thumbnail_size = MAX(p_size.x, p_size.y);
 	img->create(thumbnail_size, thumbnail_size, 0, Image::FORMAT_RGBA8);
 
 	Color bg_color = EditorSettings::get_singleton()->get("text_editor/highlighting/background_color");
@@ -613,16 +599,15 @@ bool EditorAudioStreamPreviewPlugin::handles(const String &p_type) const {
 	return ClassDB::is_parent_class(p_type, "AudioStream");
 }
 
-Ref<Texture> EditorAudioStreamPreviewPlugin::generate(const RES &p_from) const {
+Ref<Texture> EditorAudioStreamPreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
 	Ref<AudioStream> stream = p_from;
 	ERR_FAIL_COND_V(stream.is_null(), Ref<Texture>());
 
-	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-	thumbnail_size *= EDSCALE;
 	PoolVector<uint8_t> img;
-	int w = thumbnail_size;
-	int h = thumbnail_size;
+
+	int w = p_size.x;
+	int h = p_size.y;
 	img.resize(w * h * 3);
 
 	PoolVector<uint8_t>::Write imgdata = img.write();
@@ -711,7 +696,7 @@ bool EditorMeshPreviewPlugin::handles(const String &p_type) const {
 	return ClassDB::is_parent_class(p_type, "Mesh"); //any Mesh
 }
 
-Ref<Texture> EditorMeshPreviewPlugin::generate(const RES &p_from) const {
+Ref<Texture> EditorMeshPreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
 	Ref<Mesh> mesh = p_from;
 	ERR_FAIL_COND_V(mesh.is_null(), Ref<Texture>());
@@ -749,10 +734,17 @@ Ref<Texture> EditorMeshPreviewPlugin::generate(const RES &p_from) const {
 
 	VS::get_singleton()->instance_set_base(mesh_instance, RID());
 
-	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-	thumbnail_size *= EDSCALE;
 	img->convert(Image::FORMAT_RGBA8);
-	img->resize(thumbnail_size, thumbnail_size);
+
+	Vector2 new_size = img->get_size();
+	if (new_size.x > p_size.x) {
+		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
+	}
+	if (new_size.y > p_size.y) {
+		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
+	}
+	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
+
 	post_process_preview(img);
 
 	Ref<ImageTexture> ptex = Ref<ImageTexture>(memnew(ImageTexture));
@@ -825,15 +817,12 @@ bool EditorFontPreviewPlugin::handles(const String &p_type) const {
 	return ClassDB::is_parent_class(p_type, "DynamicFontData");
 }
 
-Ref<Texture> EditorFontPreviewPlugin::generate_from_path(const String &p_path) const {
+Ref<Texture> EditorFontPreviewPlugin::generate_from_path(const String &p_path, const Size2 p_size) const {
 
 	Ref<DynamicFontData> SampledFont;
 	SampledFont.instance();
 	SampledFont->set_font_path(p_path);
 
-	int thumbnail_size = EditorSettings::get_singleton()->get("filesystem/file_dialog/thumbnail_size");
-	thumbnail_size *= EDSCALE;
-
 	Ref<DynamicFont> sampled_font;
 	sampled_font.instance();
 	sampled_font->set_size(50);
@@ -864,7 +853,15 @@ Ref<Texture> EditorFontPreviewPlugin::generate_from_path(const String &p_path) c
 	ERR_FAIL_COND_V(img.is_null(), Ref<ImageTexture>());
 
 	img->convert(Image::FORMAT_RGBA8);
-	img->resize(thumbnail_size, thumbnail_size);
+
+	Vector2 new_size = img->get_size();
+	if (new_size.x > p_size.x) {
+		new_size = Vector2(p_size.x, new_size.y * p_size.x / new_size.x);
+	}
+	if (new_size.y > p_size.y) {
+		new_size = Vector2(new_size.x * p_size.y / new_size.y, p_size.y);
+	}
+	img->resize(new_size.x, new_size.y, Image::INTERPOLATE_CUBIC);
 
 	post_process_preview(img);
 
@@ -874,9 +871,9 @@ Ref<Texture> EditorFontPreviewPlugin::generate_from_path(const String &p_path) c
 	return ptex;
 }
 
-Ref<Texture> EditorFontPreviewPlugin::generate(const RES &p_from) const {
+Ref<Texture> EditorFontPreviewPlugin::generate(const RES &p_from, const Size2 p_size) const {
 
-	return generate_from_path(p_from->get_path());
+	return generate_from_path(p_from->get_path(), p_size);
 }
 
 EditorFontPreviewPlugin::EditorFontPreviewPlugin() {
diff --git a/editor/plugins/editor_preview_plugins.h b/editor/plugins/editor_preview_plugins.h
index 8bd7943383..ed5d2a3ecd 100644
--- a/editor/plugins/editor_preview_plugins.h
+++ b/editor/plugins/editor_preview_plugins.h
@@ -39,7 +39,8 @@ class EditorTexturePreviewPlugin : public EditorResourcePreviewGenerator {
 	GDCLASS(EditorTexturePreviewPlugin, EditorResourcePreviewGenerator)
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
+	virtual bool should_generate_small_preview() const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
 
 	EditorTexturePreviewPlugin();
 };
@@ -48,7 +49,8 @@ class EditorImagePreviewPlugin : public EditorResourcePreviewGenerator {
 	GDCLASS(EditorImagePreviewPlugin, EditorResourcePreviewGenerator)
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
+	virtual bool should_generate_small_preview() const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
 
 	EditorImagePreviewPlugin();
 };
@@ -57,7 +59,8 @@ class EditorBitmapPreviewPlugin : public EditorResourcePreviewGenerator {
 	GDCLASS(EditorBitmapPreviewPlugin, EditorResourcePreviewGenerator)
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
+	virtual bool should_generate_small_preview() const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
 
 	EditorBitmapPreviewPlugin();
 };
@@ -66,8 +69,8 @@ class EditorPackedScenePreviewPlugin : public EditorResourcePreviewGenerator {
 
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
-	virtual Ref<Texture> generate_from_path(const String &p_path) const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
+	virtual Ref<Texture> generate_from_path(const String &p_path, const Size2 p_size) const;
 
 	EditorPackedScenePreviewPlugin();
 };
@@ -95,7 +98,8 @@ protected:
 
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
+	virtual bool should_generate_small_preview() const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
 
 	EditorMaterialPreviewPlugin();
 	~EditorMaterialPreviewPlugin();
@@ -104,7 +108,7 @@ public:
 class EditorScriptPreviewPlugin : public EditorResourcePreviewGenerator {
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
 
 	EditorScriptPreviewPlugin();
 };
@@ -112,7 +116,7 @@ public:
 class EditorAudioStreamPreviewPlugin : public EditorResourcePreviewGenerator {
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
 
 	EditorAudioStreamPreviewPlugin();
 };
@@ -139,7 +143,7 @@ protected:
 
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
 
 	EditorMeshPreviewPlugin();
 	~EditorMeshPreviewPlugin();
@@ -162,8 +166,8 @@ protected:
 
 public:
 	virtual bool handles(const String &p_type) const;
-	virtual Ref<Texture> generate(const RES &p_from) const;
-	virtual Ref<Texture> generate_from_path(const String &p_path) const;
+	virtual Ref<Texture> generate(const RES &p_from, const Size2 p_size) const;
+	virtual Ref<Texture> generate_from_path(const String &p_path, const Size2 p_size) const;
 
 	EditorFontPreviewPlugin();
 	~EditorFontPreviewPlugin();