refact, separate remote window

Signed-off-by: dignow <linlong1265@gmail.com>

src/flutter_ffi.rs

@@ -15,7 +15,7 @@ use flutter_rust_bridge::{StreamSink, SyncReturn};
 use hbb_common::allow_err;
 use hbb_common::{
     config::{self, LocalConfig, PeerConfig, PeerInfoSerde},
-    fs, log,
+    fs, lazy_static, log,
     message_proto::KeyboardMode,
     ResultType,
 };
@@ -24,11 +24,19 @@ use std::{
     ffi::{CStr, CString},
     os::raw::c_char,
     str::FromStr,
+    sync::{
+        atomic::{AtomicI32, Ordering},
+        Arc,
+    },
     time::SystemTime,
 };
 
 pub type SessionID = uuid::Uuid;
 
+lazy_static::lazy_static! {
+    static ref TEXTURE_RENDER_KEY: Arc<AtomicI32> = Arc::new(AtomicI32::new(0));
+}
+
 fn initialize(app_dir: &str) {
     *config::APP_DIR.write().unwrap() = app_dir.to_owned();
     #[cfg(target_os = "android")]
@@ -197,6 +205,11 @@ pub fn session_set_flutter_config(session_id: SessionID, k: String, v: String) {
     }
 }
 
+pub fn get_next_texture_key() -> SyncReturn<i32> {
+    let k = TEXTURE_RENDER_KEY.fetch_add(1, Ordering::SeqCst) + 1;
+    SyncReturn(k)
+}
+
 pub fn get_local_flutter_config(k: String) -> SyncReturn<String> {
     SyncReturn(ui_interface::get_local_flutter_config(k))
 }