From 200e7435687c1b08d122b5ed617198aaedd00315 Mon Sep 17 00:00:00 2001
From: MuffinTastic <git@muffintastic.dev>
Date: Wed, 5 Nov 2025 01:34:26 -0800
Subject: [PATCH] Use TEXTURE_FILTER_NEAREST_WITH_MIPMAPS in FileSystemDock

---
 editor/docks/filesystem_dock.cpp | 41 ++++++++++++++++++++++++++++----
 editor/docks/filesystem_dock.h   |  1 +
 2 files changed, 37 insertions(+), 5 deletions(-)

diff --git a/editor/docks/filesystem_dock.cpp b/editor/docks/filesystem_dock.cpp
index a2342842d3..be16f88036 100644
--- a/editor/docks/filesystem_dock.cpp
+++ b/editor/docks/filesystem_dock.cpp
@@ -837,12 +837,16 @@ void FileSystemDock::navigate_to_path(const String &p_path) {
 void FileSystemDock::_file_list_thumbnail_done(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, int p_index, const String &p_filename) {
 	if (p_preview.is_valid()) {
 		if (p_index < files->get_item_count() && files->get_item_text(p_index) == p_filename && files->get_item_metadata(p_index) == p_path) {
+			Ref<Texture2D> thumbnail;
+
 			if (file_list_display_mode == FILE_LIST_DISPLAY_LIST) {
-				if (p_small_preview.is_valid()) {
-					files->set_item_icon(p_index, p_small_preview);
-				}
+				thumbnail = p_small_preview;
 			} else {
-				files->set_item_icon(p_index, p_preview);
+				thumbnail = p_preview;
+			}
+
+			if (thumbnail.is_valid()) {
+				files->set_item_icon(p_index, _apply_thumbnail_filter(thumbnail, p_path));
 			}
 		}
 	}
@@ -851,10 +855,37 @@ void FileSystemDock::_file_list_thumbnail_done(const String &p_path, const Ref<T
 void FileSystemDock::_tree_thumbnail_done(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, int p_update_id, ObjectID p_item) {
 	TreeItem *item = ObjectDB::get_instance<TreeItem>(p_item);
 	if (item && tree_update_id == p_update_id && p_small_preview.is_valid()) {
-		item->set_icon(0, p_small_preview);
+		item->set_icon(0, _apply_thumbnail_filter(p_small_preview, p_path));
 	}
 }
 
+Ref<Texture2D> FileSystemDock::_apply_thumbnail_filter(const Ref<Texture2D> &p_thumbnail, const String &p_file_path) const {
+	if (!p_file_path.is_empty()) {
+		int index;
+		EditorFileSystemDirectory *dir = EditorFileSystem::get_singleton()->find_file(p_file_path, &index);
+
+		if (dir) {
+			if (dir->get_file_import_is_valid(index)) {
+				const StringName &file_type = dir->get_file_type(index);
+
+				if (file_type == SNAME("CompressedTexture2D") || file_type == SNAME("Image")) {
+					const String extension = p_file_path.get_extension();
+
+					if (extension != "svg" && extension != "svgz") {
+						Ref<CanvasTexture> thumbnail_wrapped;
+						thumbnail_wrapped.instantiate();
+						thumbnail_wrapped->set_diffuse_texture(p_thumbnail);
+						thumbnail_wrapped->set_texture_filter(CanvasItem::TextureFilter::TEXTURE_FILTER_NEAREST_WITH_MIPMAPS);
+						return thumbnail_wrapped;
+					}
+				}
+			}
+		}
+	}
+
+	return p_thumbnail;
+}
+
 void FileSystemDock::_toggle_file_display() {
 	_set_file_display(file_list_display_mode != FILE_LIST_DISPLAY_LIST);
 	emit_signal(SNAME("display_mode_changed"));
diff --git a/editor/docks/filesystem_dock.h b/editor/docks/filesystem_dock.h
index 527f7c0b59..ebfe4141e3 100644
--- a/editor/docks/filesystem_dock.h
+++ b/editor/docks/filesystem_dock.h
@@ -357,6 +357,7 @@ private:
 	void _preview_invalidated(const String &p_path);
 	void _file_list_thumbnail_done(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, int p_index, const String &p_filename);
 	void _tree_thumbnail_done(const String &p_path, const Ref<Texture2D> &p_preview, const Ref<Texture2D> &p_small_preview, int p_update_id, ObjectID p_item);
+	Ref<Texture2D> _apply_thumbnail_filter(const Ref<Texture2D> &p_thumbnail, const String &p_file_path) const;
 
 	void _update_display_mode(bool p_force = false);