fix: Crash because of default icon path

examples/hello_triangle.ts

@@ -15,6 +15,7 @@ fn fs_main() -> @location(0) vec4<f32> {
 `;
 
 const windowTitle = "Hello Triangle";
+const windowIconPath = Deno.realPathSync("assets/icon.png");
 const presentationFormat = "bgra8unorm";
 let renderPipeline: GPURenderPipeline | null = null;
 
@@ -75,6 +76,7 @@ const resizeFunction = (width: number, height: number) => {
 
 const window = new WinitWindow({
   windowTitle,
+  windowIconPath,
   presentationFormat,
   setupFunction,
   drawFunction,

mod.ts

@@ -36,7 +36,7 @@ export class WinitWindow {
   private dylibPromise: Promise<winitDylib>;
   private system: "win32" | "cocoa" | "wayland" | "x11" | null = null;
   private windowTitle: string = "Deno + winit";
-  private windowIconPath: string = Deno.realPathSync("assets/icon.png");
+  private windowIconPath: string | null = null;
   private width: number = 512;
   private height: number = 512;
   private presentationFormat: GPUTextureFormat = "bgra8unorm";
@@ -53,7 +53,7 @@ export class WinitWindow {
    * The winit window constructor.
    * @param forceX11 Whether to force X11 on Linux.
    * @param windowTitle The window title.
-   * @param windowIconPath The window icon path.
+   * @param windowIconPath The window icon absolute path. Only supported on Windows and X11.
    * @param width The window width in pixels.
    * @param height The window height in pixels.
    * @param presentationFormat The presentation format.
@@ -262,7 +262,7 @@ export class WinitWindow {
     const dylib = await this.dylibPromise;
     dylib.symbols.spawn_window(
       asCString(this.windowTitle),
-      asCString(this.windowIconPath),
+      this.windowIconPath ? asCString(this.windowIconPath) : null,
       this.width,
       this.height,
       setupFunctionFfiCallback.pointer,

src/lib.rs

@@ -28,18 +28,6 @@ pub extern "C" fn spawn_window(
     draw_func: extern "C" fn(),
     resize_func: extern "C" fn(width: u32, height: u32),
 ) {
-    // Load window icon from path
-    let window_icon_path: String = unsafe {
-        String::from_utf8(
-            CStr::from_ptr(window_icon_path as *const c_char)
-                .to_bytes()
-                .to_vec(),
-        )
-        .expect("Failed to convert window icon path to string")
-    };
-    let window_icon_path: &Path = Path::new(window_icon_path.as_str());
-    let window_icon = load_icon(window_icon_path);
-
     let event_loop = EventLoop::new().unwrap();
 
     let window = WindowBuilder::new()
@@ -52,10 +40,25 @@ pub extern "C" fn spawn_window(
             .expect("Failed to convert window title to string")
         })
         .with_inner_size(Size::Physical(PhysicalSize::new(width, height)))
-        .with_window_icon(Some(window_icon))
         .build(&event_loop)
         .unwrap();
 
+    // Load window icon if provided
+    if !window_icon_path.is_null() {
+        let window_icon_path: String = unsafe {
+            String::from_utf8(
+                CStr::from_ptr(window_icon_path as *const c_char)
+                    .to_bytes()
+                    .to_vec(),
+            )
+            .expect("Failed to convert window icon path to string")
+        };
+        let window_icon_path: &Path = Path::new(window_icon_path.as_str());
+        let window_icon = load_icon(window_icon_path);
+
+        window.set_window_icon(Some(window_icon));
+    }
+
     match window.raw_window_handle() {
         raw_window_handle::RawWindowHandle::Win32(handle) => setup_func(
             handle.hwnd,