privacy_mode: win10 magnifier

Signed-off-by: fufesou <shuanglongchen@yeah.net>

libs/hbb_common/protos/message.proto

@@ -65,6 +65,10 @@ message LoginRequest {
 
 message ChatMessage { string text = 1; }
 
+message Features {
+  bool privacy_mode = 1;
+}
+
 message PeerInfo {
   string username = 1;
   string hostname = 2;
@@ -74,6 +78,7 @@ message PeerInfo {
   bool sas_enabled = 6;
   string version = 7;
   int32 conn_id = 8;
+  Features features = 9;
 }
 
 message LoginResponse {
@@ -442,11 +447,6 @@ message OptionMessage {
   BoolOption enable_file_transfer = 9;
 }
 
-message OptionResponse {
-  OptionMessage opt = 1;
-  string error = 2;
-}
-
 message TestDelay {
   int64 time = 1;
   bool from_client = 2;
@@ -469,6 +469,44 @@ message AudioFrame {
   int64 timestamp = 2;
 }
 
+message BackNotification {
+  // no need to consider block input by someone else
+  enum BlockInputState {
+    StateUnknown = 1;
+    OnSucceeded = 2;
+    OnFailed = 3;
+    OffSucceeded = 4;
+    OffFailed = 5;
+  }
+  enum PrivacyModeState {
+    StateUnknown = 1;
+    // Privacy mode on by someone else
+    OnByOther = 2;
+    // Privacy mode is not supported on the remote side
+    NotSupported = 3;
+    // Privacy mode on by self
+    OnSucceeded = 4;
+    // Privacy mode on by self, but denied
+    OnFailedDenied = 5;
+    // Some plugins are not found
+    OnFailedPlugin = 6;
+    // Privacy mode on by self, but failed
+    OnFailed = 7;
+    // Privacy mode off by self
+    OffSucceeded = 8;
+    // Ctrl + P
+    OffByPeer = 9;
+    // Privacy mode off by self, but failed
+    OffFailed = 10;
+    OffUnknown = 11;
+  }
+
+  oneof union {
+    PrivacyModeState privacy_mode_state = 1;
+    BlockInputState block_input_state = 2;
+  }
+}
+
 message Misc {
   oneof union {
     ChatMessage chat_message = 4;
@@ -478,8 +516,8 @@ message Misc {
     AudioFormat audio_format = 8;
     string close_reason = 9;
     bool refresh_video = 10;
-    OptionResponse option_response = 11;
     bool video_received = 12;
+    BackNotification back_notification = 13;
   }
 }