[HTML5] Implement window blur in JS library.

Removes more emscripten HTML5 library dependencies.

platform/javascript/godot_js.h

@@ -95,6 +95,7 @@ extern void godot_js_display_mouse_wheel_cb(int (*p_callback)(double p_delta_x,
 extern void godot_js_display_touch_cb(void (*p_callback)(int p_type, int p_count), uint32_t *r_identifiers, double *r_coords);
 extern void godot_js_display_key_cb(void (*p_callback)(int p_type, int p_repeat, int p_modifiers), char r_code[32], char r_key[32]);
 extern void godot_js_display_fullscreen_cb(void (*p_callback)(int p_fullscreen));
+extern void godot_js_display_window_blur_cb(void (*p_callback)());
 extern void godot_js_display_notification_cb(void (*p_callback)(int p_notification), int p_enter, int p_exit, int p_in, int p_out);
 extern void godot_js_display_paste_cb(void (*p_callback)(const char *p_text));
 extern void godot_js_display_drop_files_cb(void (*p_callback)(char **p_filev, int p_filec));

platform/javascript/js/libs/library_godot_display.js

@@ -867,6 +867,14 @@ const GodotDisplay = {
 		GodotDisplayListeners.add(document, 'webkitfullscreenchange', change_cb, false);
 	},
 
+	godot_js_display_window_blur_cb__sig: 'vi',
+	godot_js_display_window_blur_cb: function (callback) {
+		const func = GodotRuntime.get_func(callback);
+		GodotDisplayListeners.add(window, 'blur', function () {
+			func();
+		}, false);
+	},
+
 	godot_js_display_notification_cb__sig: 'viiiii',
 	godot_js_display_notification_cb: function (callback, p_enter, p_exit, p_in, p_out) {
 		const canvas = GodotConfig.canvas;

platform/javascript/os_javascript.cpp

@@ -108,9 +108,8 @@ void OS_JavaScript::fullscreen_change_callback(int p_fullscreen) {
 	}
 }
 
-EM_BOOL OS_JavaScript::blur_callback(int p_event_type, const EmscriptenFocusEvent *p_event, void *p_user_data) {
+void OS_JavaScript::window_blur_callback() {
 	get_singleton()->input->release_pressed_events();
-	return false;
 }
 
 void OS_JavaScript::set_video_mode(const VideoMode &p_video_mode, int p_screen) {
@@ -803,28 +802,13 @@ Error OS_JavaScript::initialize(const VideoMode &p_desired, int p_video_driver,
 #endif
 	input = memnew(InputDefault);
 
-	EMSCRIPTEN_RESULT result;
-#define EM_CHECK(ev)                         \
-	if (result != EMSCRIPTEN_RESULT_SUCCESS) \
-		ERR_PRINT("Error while setting " #ev " callback: Code " + itos(result));
-#define SET_EM_CALLBACK(target, ev, cb)                               \
-	result = emscripten_set_##ev##_callback(target, NULL, true, &cb); \
-	EM_CHECK(ev)
-#define SET_EM_WINDOW_CALLBACK(ev, cb)                                                         \
-	result = emscripten_set_##ev##_callback(EMSCRIPTEN_EVENT_TARGET_WINDOW, NULL, false, &cb); \
-	EM_CHECK(ev)
-	// These callbacks from Emscripten's html5.h suffice to access most
-	// JavaScript APIs.
-	SET_EM_WINDOW_CALLBACK(blur, blur_callback)
-#undef SET_EM_CALLBACK
-#undef EM_CHECK
-
 	godot_js_display_mouse_button_cb(&OS_JavaScript::mouse_button_callback);
 	godot_js_display_mouse_move_cb(&OS_JavaScript::mouse_move_callback);
 	godot_js_display_mouse_wheel_cb(&OS_JavaScript::mouse_wheel_callback);
 	godot_js_display_touch_cb(&OS_JavaScript::touch_callback, touch_event.identifier, touch_event.coords);
 	godot_js_display_key_cb(&OS_JavaScript::key_callback, key_event.code, key_event.key);
 	godot_js_display_fullscreen_cb(&OS_JavaScript::fullscreen_change_callback);
+	godot_js_display_window_blur_cb(&window_blur_callback);
 	godot_js_display_notification_cb(&OS_JavaScript::send_notification_callback,
 			MainLoop::NOTIFICATION_WM_MOUSE_ENTER,
 			MainLoop::NOTIFICATION_WM_MOUSE_EXIT,

platform/javascript/os_javascript.h

@@ -82,8 +82,6 @@ private:
 	bool idb_needs_sync;
 	bool idb_is_syncing;
 
-	static EM_BOOL blur_callback(int p_event_type, const EmscriptenFocusEvent *p_event, void *p_user_data);
-
 	static void fullscreen_change_callback(int p_fullscreen);
 	static int mouse_button_callback(int p_pressed, int p_button, double p_x, double p_y, int p_modifiers);
 	static void mouse_move_callback(double p_x, double p_y, double p_rel_x, double p_rel_y, int p_modifiers);
@@ -98,6 +96,7 @@ private:
 	static void file_access_close_callback(const String &p_file, int p_flags);
 
 	static void request_quit_callback();
+	static void window_blur_callback();
 	static void drop_files_callback(char **p_filev, int p_filec);
 	static void send_notification_callback(int p_notification);
 	static void fs_sync_callback();