[fix] reset default cert fingerprint if mismatch

src/gui/render.cpp

@@ -1737,13 +1737,19 @@ void Render::CleanupFactories() {
 void Render::CleanupPeer(std::shared_ptr<SubStreamWindowProperties> props) {
   SDL_FlushEvent(STREAM_REFRESH_EVENT);
 
-  if (props->dst_buffer_) {
+  std::shared_ptr<std::vector<unsigned char>> frame_snapshot;
-    size_t buffer_size = props->dst_buffer_capacity_;
+  int video_width = 0;
-    std::vector<unsigned char> buffer_copy(buffer_size);
+  int video_height = 0;
-    memcpy(buffer_copy.data(), props->dst_buffer_, buffer_size);
+  {
+    std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+    frame_snapshot = props->front_frame_;
+    video_width = props->video_width_;
+    video_height = props->video_height_;
+  }
 
-    int video_width = props->video_width_;
+  if (frame_snapshot && !frame_snapshot->empty() && video_width > 0 &&
-    int video_height = props->video_height_;
+      video_height > 0) {
+    std::vector<unsigned char> buffer_copy(*frame_snapshot);
     std::string remote_id = props->remote_id_;
     std::string remote_host_name = props->remote_host_name_;
     std::string password =
@@ -1824,9 +1830,15 @@ void Render::CleanSubStreamWindowProperties(
     props->stream_texture_ = nullptr;
   }
 
-  if (props->dst_buffer_) {
+  {
-    delete[] props->dst_buffer_;
+    std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
-    props->dst_buffer_ = nullptr;
+    props->front_frame_.reset();
+    props->back_frame_.reset();
+    props->video_width_ = 0;
+    props->video_height_ = 0;
+    props->video_size_ = 0;
+    props->render_rect_dirty_ = true;
+    props->stream_cleanup_pending_ = false;
   }
 }
 
@@ -2112,10 +2124,22 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
         {
           // std::shared_lock lock(client_properties_mutex_);
           for (auto& [host_name, props] : client_properties_) {
-            thumbnail_->SaveToThumbnail(
+            std::shared_ptr<std::vector<unsigned char>> frame_snapshot;
-                (char*)props->dst_buffer_, props->video_width_,
+            int video_width = 0;
-                props->video_height_, host_name, props->remote_host_name_,
+            int video_height = 0;
-                props->remember_password_ ? props->remote_password_ : "");
+            {
+              std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+              frame_snapshot = props->front_frame_;
+              video_width = props->video_width_;
+              video_height = props->video_height_;
+            }
+            if (frame_snapshot && !frame_snapshot->empty() && video_width > 0 &&
+                video_height > 0) {
+              thumbnail_->SaveToThumbnail(
+                  (char*)frame_snapshot->data(), video_width, video_height,
+                  host_name, props->remote_host_name_,
+                  props->remember_password_ ? props->remote_password_ : "");
+            }
 
             if (props->peer_) {
               std::string client_id = (host_name == client_id_)
@@ -2209,18 +2233,52 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
         if (!props) {
           break;
         }
-        if (props->video_width_ <= 0 || props->video_height_ <= 0) {
+        std::shared_ptr<std::vector<unsigned char>> frame_snapshot;
+        int video_width = 0;
+        int video_height = 0;
+        bool render_rect_dirty = false;
+        bool cleanup_pending = false;
+        {
+          std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+          cleanup_pending = props->stream_cleanup_pending_;
+          if (!cleanup_pending) {
+            frame_snapshot = props->front_frame_;
+            video_width = props->video_width_;
+            video_height = props->video_height_;
+          }
+          render_rect_dirty = props->render_rect_dirty_;
+        }
+
+        if (cleanup_pending) {
+          if (props->stream_texture_) {
+            SDL_DestroyTexture(props->stream_texture_);
+            props->stream_texture_ = nullptr;
+          }
+          {
+            std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+            props->stream_cleanup_pending_ = false;
+          }
+
+          if (render_rect_dirty) {
+            UpdateRenderRect();
+            std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+            props->render_rect_dirty_ = false;
+          }
           break;
         }
-        if (!props->dst_buffer_) {
+
+        if (video_width <= 0 || video_height <= 0) {
+          break;
+        }
+        if (!frame_snapshot || frame_snapshot->empty()) {
           break;
         }
 
         if (props->stream_texture_) {
-          if (props->video_width_ != props->texture_width_ ||
+          if (video_width != props->texture_width_ ||
-              props->video_height_ != props->texture_height_) {
+              video_height != props->texture_height_) {
-            props->texture_width_ = props->video_width_;
+            props->texture_width_ = video_width;
-            props->texture_height_ = props->video_height_;
+            props->texture_height_ = video_height;
 
             SDL_DestroyTexture(props->stream_texture_);
             // props->stream_texture_ = SDL_CreateTexture(
@@ -2245,8 +2303,8 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
             SDL_DestroyProperties(nvProps);
           }
         } else {
-          props->texture_width_ = props->video_width_;
+          props->texture_width_ = video_width;
-          props->texture_height_ = props->video_height_;
+          props->texture_height_ = video_height;
           // props->stream_texture_ = SDL_CreateTexture(
           //     stream_renderer_, stream_pixformat_,
           //     SDL_TEXTUREACCESS_STREAMING, props->texture_width_,
@@ -2267,8 +2325,14 @@ void Render::ProcessSdlEvent(const SDL_Event& event) {
           SDL_DestroyProperties(nvProps);
         }
 
-        SDL_UpdateTexture(props->stream_texture_, NULL, props->dst_buffer_,
+        SDL_UpdateTexture(props->stream_texture_, NULL, frame_snapshot->data(),
                           props->texture_width_);
+
+        if (render_rect_dirty) {
+          UpdateRenderRect();
+          std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
+          props->render_rect_dirty_ = false;
+        }
       }
       break;
   }

src/gui/render.h

@@ -123,8 +123,13 @@ class Render {
     float mouse_diff_control_bar_pos_y_ = 0;
     double control_bar_button_pressed_time_ = 0;
     double net_traffic_stats_button_pressed_time_ = 0;
-    unsigned char* dst_buffer_ = nullptr;
+    // Double-buffered NV12 frame storage. Written by decode callback thread,
-    size_t dst_buffer_capacity_ = 0;
+    // consumed by SDL main thread.
+    std::mutex video_frame_mutex_;
+    std::shared_ptr<std::vector<unsigned char>> front_frame_;
+    std::shared_ptr<std::vector<unsigned char>> back_frame_;
+    bool render_rect_dirty_ = false;
+    bool stream_cleanup_pending_ = false;
     float mouse_pos_x_ = 0;
     float mouse_pos_y_ = 0;
     float mouse_pos_x_last_ = 0;
@@ -607,8 +612,8 @@ class Render {
   uint64_t last_frame_time_;
   bool show_new_version_icon_ = false;
   bool show_new_version_icon_in_menu_ = true;
-  uint64_t new_version_icon_last_trigger_time_ = 0;
+  double new_version_icon_last_trigger_time_ = 0.0;
-  uint64_t new_version_icon_render_start_time_ = 0;
+  double new_version_icon_render_start_time_ = 0.0;
 #ifdef __APPLE__
   bool show_request_permission_window_ = true;
 #endif

src/gui/render_callback.cpp

@@ -4,6 +4,7 @@
 #include <cstring>
 #include <filesystem>
 #include <fstream>
+#include <limits>
 #include <unordered_map>
 
 #include "clipboard.h"
@@ -237,31 +238,31 @@ void Render::OnReceiveVideoBufferCb(const XVideoFrame* video_frame,
       render->client_properties_.find(remote_id)->second.get();
 
   if (props->connection_established_) {
-    if (!props->dst_buffer_) {
+    {
-      props->dst_buffer_capacity_ = video_frame->size;
+      std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
-      props->dst_buffer_ = new unsigned char[video_frame->size];
-    }
 
-    if (props->dst_buffer_capacity_ < video_frame->size) {
+      if (!props->back_frame_) {
-      delete props->dst_buffer_;
+        props->back_frame_ =
-      props->dst_buffer_capacity_ = video_frame->size;
+            std::make_shared<std::vector<unsigned char>>(video_frame->size);
-      props->dst_buffer_ = new unsigned char[video_frame->size];
+      }
-    }
+      if (props->back_frame_->size() != video_frame->size) {
+        props->back_frame_->resize(video_frame->size);
+      }
 
-    memcpy(props->dst_buffer_, video_frame->data, video_frame->size);
+      std::memcpy(props->back_frame_->data(), video_frame->data,
-    bool need_to_update_render_rect = false;
+                  video_frame->size);
-    if (props->video_width_ != props->video_width_last_ ||
-        props->video_height_ != props->video_height_last_) {
-      need_to_update_render_rect = true;
-      props->video_width_last_ = props->video_width_;
-      props->video_height_last_ = props->video_height_;
-    }
-    props->video_width_ = video_frame->width;
-    props->video_height_ = video_frame->height;
-    props->video_size_ = video_frame->size;
 
-    if (need_to_update_render_rect) {
+      const bool size_changed = (props->video_width_ != video_frame->width) ||
-      render->UpdateRenderRect();
+                                (props->video_height_ != video_frame->height);
+      if (size_changed) {
+        props->render_rect_dirty_ = true;
+      }
+
+      props->video_width_ = video_frame->width;
+      props->video_height_ = video_frame->height;
+      props->video_size_ = video_frame->size;
+
+      props->front_frame_.swap(props->back_frame_);
     }
 
     SDL_Event event;
@@ -416,8 +417,46 @@ void Render::OnReceiveDataBufferCb(const char* data, size_t size,
           rate_bps = state->file_send_rate_bps_.load();
         }
       } else {
-        // Global transfer: no per-connection bitrate, keep existing value.
+        // Global transfer: no per-connection bitrate available.
-        rate_bps = state->file_send_rate_bps_.load();
+        // Estimate send rate from ACKed bytes delta over time.
+        const uint32_t current_rate = state->file_send_rate_bps_.load();
+        uint32_t estimated_rate_bps = 0;
+        const auto now = std::chrono::steady_clock::now();
+
+        uint64_t last_bytes = 0;
+        std::chrono::steady_clock::time_point last_time;
+        {
+          std::lock_guard<std::mutex> lock(state->file_transfer_mutex_);
+          last_bytes = state->file_send_last_bytes_;
+          last_time = state->file_send_last_update_time_;
+        }
+
+        if (state->file_sending_.load() && ack.acked_offset >= last_bytes) {
+          const uint64_t delta_bytes = ack.acked_offset - last_bytes;
+          const double delta_seconds =
+              std::chrono::duration<double>(now - last_time).count();
+
+          if (delta_seconds > 0.0 && delta_bytes > 0) {
+            const double bps =
+                (static_cast<double>(delta_bytes) * 8.0) / delta_seconds;
+            if (bps > 0.0) {
+              const double capped = (std::min)(
+                  bps,
+                  static_cast<double>((std::numeric_limits<uint32_t>::max)()));
+              estimated_rate_bps = static_cast<uint32_t>(capped);
+            }
+          }
+        }
+
+        if (estimated_rate_bps > 0 && current_rate > 0) {
+          // 70% old + 30% new for smoother display
+          rate_bps = static_cast<uint32_t>(current_rate * 0.7 +
+                                           estimated_rate_bps * 0.3);
+        } else if (estimated_rate_bps > 0) {
+          rate_bps = estimated_rate_bps;
+        } else {
+          rate_bps = current_rate;
+        }
       }
 
       state->file_send_rate_bps_ = rate_bps;
@@ -574,6 +613,10 @@ void Render::OnSignalStatusCb(SignalStatus status, const char* user_id,
       render->signal_connected_ = false;
     } else if (SignalStatus::SignalServerClosed == status) {
       render->signal_connected_ = false;
+    } else if (SignalStatus::SignalFingerprintMismatch == status) {
+      render->signal_connected_ = false;
+      LOG_ERROR("[{}] signal server fingerprint mismatch", client_id);
+      render->config_center_->ClearDefaultCertFingerprint();
     }
   } else {
     if (client_id.rfind("C-", 0) != 0) {
@@ -601,6 +644,9 @@ void Render::OnSignalStatusCb(SignalStatus status, const char* user_id,
       props->signal_connected_ = false;
     } else if (SignalStatus::SignalServerClosed == status) {
       props->signal_connected_ = false;
+    } else if (SignalStatus::SignalFingerprintMismatch == status) {
+      props->signal_connected_ = false;
+      LOG_ERROR("[{}] signal server fingerprint mismatch", remote_id);
     }
   }
 }
@@ -681,12 +727,22 @@ void Render::OnConnectionStatusCb(ConnectionStatus status, const char* user_id,
       case ConnectionStatus::Closed: {
         props->connection_established_ = false;
         props->mouse_control_button_pressed_ = false;
-        if (props->dst_buffer_ && props->stream_texture_) {
+
-          memset(props->dst_buffer_, 0, props->dst_buffer_capacity_);
+        {
-          SDL_UpdateTexture(props->stream_texture_, NULL, props->dst_buffer_,
+          std::lock_guard<std::mutex> lock(props->video_frame_mutex_);
-                            props->texture_width_);
+          props->front_frame_.reset();
+          props->back_frame_.reset();
+          props->video_width_ = 0;
+          props->video_height_ = 0;
+          props->video_size_ = 0;
+          props->render_rect_dirty_ = true;
+          props->stream_cleanup_pending_ = true;
         }
-        render->CleanSubStreamWindowProperties(props);
+
+        SDL_Event event;
+        event.type = render->STREAM_REFRESH_EVENT;
+        event.user.data1 = props.get();
+        SDL_PushEvent(&event);
 
         break;
       }

src/gui/toolbars/title_bar.cpp

@@ -3,7 +3,8 @@
 #include "rd_log.h"
 #include "render.h"
 
-#define NEW_VERSION_ICON_RENDER_TIME_INTERVAL 2000
+constexpr double kNewVersionIconBlinkIntervalSec = 2.0;
+constexpr double kNewVersionIconBlinkOnTimeSec = 1.0;
 
 namespace crossdesk {
 
@@ -106,13 +107,11 @@ int Render::TitleBar(bool main_window) {
 
       std::string about_str = localization::about[localization_language_index_];
       if (update_available_) {
-        auto now_time = std::chrono::duration_cast<std::chrono::milliseconds>(
+        const double now_time = ImGui::GetTime();
-                            std::chrono::steady_clock::now().time_since_epoch())
-                            .count();
 
         // every 2 seconds
         if (now_time - new_version_icon_last_trigger_time_ >=
-            NEW_VERSION_ICON_RENDER_TIME_INTERVAL) {
+            kNewVersionIconBlinkIntervalSec) {
           show_new_version_icon_ = true;
           new_version_icon_render_start_time_ = now_time;
           new_version_icon_last_trigger_time_ = now_time;
@@ -120,9 +119,9 @@ int Render::TitleBar(bool main_window) {
 
         // render for 1 second
         if (show_new_version_icon_) {
-          about_str = about_str + " " + ICON_FA_TRIANGLE_EXCLAMATION;
+          about_str = about_str + " " + ICON_FA_CIRCLE_ARROW_UP;
           if (now_time - new_version_icon_render_start_time_ >=
-              NEW_VERSION_ICON_RENDER_TIME_INTERVAL / 2) {
+              kNewVersionIconBlinkOnTimeSec) {
             show_new_version_icon_ = false;
           }
         } else {
@@ -151,13 +150,11 @@ int Render::TitleBar(bool main_window) {
     }
 
     if (update_available_ && show_new_version_icon_in_menu_) {
-      auto now_time = std::chrono::duration_cast<std::chrono::milliseconds>(
+      const double now_time = ImGui::GetTime();
-                          std::chrono::steady_clock::now().time_since_epoch())
-                          .count();
 
       // every 2 seconds
       if (now_time - new_version_icon_last_trigger_time_ >=
-          NEW_VERSION_ICON_RENDER_TIME_INTERVAL) {
+          kNewVersionIconBlinkIntervalSec) {
         show_new_version_icon_ = true;
         new_version_icon_render_start_time_ = now_time;
         new_version_icon_last_trigger_time_ = now_time;
@@ -166,14 +163,13 @@ int Render::TitleBar(bool main_window) {
       // render for 1 second
       if (show_new_version_icon_) {
         ImGui::SetWindowFontScale(0.6f);
-        ImGui::SetCursorPos(
+        ImGui::SetCursorPos(ImVec2(bar_pos_x + title_bar_button_width * 0.21f,
-            ImVec2(bar_pos_x + title_bar_button_width * 0.15f,
+                                   bar_pos_y - title_bar_button_width * 0.24f));
-                   bar_pos_y - title_bar_button_width * 0.325f));
+        ImGui::Text(ICON_FA_CIRCLE_ARROW_UP);
-        ImGui::Text(ICON_FA_TRIANGLE_EXCLAMATION);
         ImGui::SetWindowFontScale(1.0f);
 
         if (now_time - new_version_icon_render_start_time_ >=
-            NEW_VERSION_ICON_RENDER_TIME_INTERVAL / 2) {
+            kNewVersionIconBlinkOnTimeSec) {
           show_new_version_icon_ = false;
         }
       }

src/gui/windows/server_window.cpp

@@ -1,4 +1,6 @@
 #include <algorithm>
+#include <cmath>
+#include <cstdio>
 #include <string>
 #include <vector>
 
@@ -9,6 +11,39 @@
 
 namespace crossdesk {
 
+namespace {
+int CountDigits(int number) {
+  if (number == 0) return 1;
+  return (int)std::floor(std::log10(std::abs(number))) + 1;
+}
+
+void BitrateDisplay(uint32_t bitrate) {
+  const int num_of_digits = CountDigits(static_cast<int>(bitrate));
+  if (num_of_digits <= 3) {
+    ImGui::Text("%u bps", bitrate);
+  } else if (num_of_digits > 3 && num_of_digits <= 6) {
+    ImGui::Text("%u kbps", bitrate / 1000);
+  } else {
+    ImGui::Text("%.1f mbps", bitrate / 1000000.0f);
+  }
+}
+
+std::string FormatBytes(uint64_t bytes) {
+  char buf[64];
+  if (bytes < 1024ULL) {
+    std::snprintf(buf, sizeof(buf), "%llu B", (unsigned long long)bytes);
+  } else if (bytes < 1024ULL * 1024ULL) {
+    std::snprintf(buf, sizeof(buf), "%.2f KB", bytes / 1024.0);
+  } else if (bytes < 1024ULL * 1024ULL * 1024ULL) {
+    std::snprintf(buf, sizeof(buf), "%.2f MB", bytes / (1024.0 * 1024.0));
+  } else {
+    std::snprintf(buf, sizeof(buf), "%.2f GB",
+                  bytes / (1024.0 * 1024.0 * 1024.0));
+  }
+  return std::string(buf);
+}
+}  // namespace
+
 int Render::ServerWindow() {
   ImGui::SetNextWindowSize(ImVec2(server_window_width_, server_window_height_),
                            ImGuiCond_Always);
@@ -235,6 +270,75 @@ int Render::RemoteClientInfoWindow() {
     ProcessSelectedFile(path, nullptr, file_label_, selected_server_remote_id_);
   }
 
+  if (file_transfer_.file_transfer_window_visible_) {
+    ImGui::SameLine();
+    const bool is_sending = file_transfer_.file_sending_.load();
+
+    if (is_sending) {
+      // Simple animation: cycle icon every 0.5s while sending.
+      static const char* kFileTransferIcons[] = {ICON_FA_ANGLE_UP,
+                                                 ICON_FA_ANGLES_UP};
+      const int icon_index = static_cast<int>(ImGui::GetTime() / 0.5) %
+                             (static_cast<int>(sizeof(kFileTransferIcons) /
+                                               sizeof(kFileTransferIcons[0])));
+      ImGui::Text("%s", kFileTransferIcons[icon_index]);
+    } else {
+      // Completed.
+      ImGui::Text("%s", ICON_FA_CHECK);
+    }
+
+    if (ImGui::IsItemHovered()) {
+      const uint64_t sent_bytes = file_transfer_.file_sent_bytes_.load();
+      const uint64_t total_bytes = file_transfer_.file_total_bytes_.load();
+      const uint32_t rate_bps = file_transfer_.file_send_rate_bps_.load();
+
+      float progress = 0.0f;
+      if (total_bytes > 0) {
+        progress =
+            static_cast<float>(sent_bytes) / static_cast<float>(total_bytes);
+        progress = (std::max)(0.0f, (std::min)(1.0f, progress));
+      }
+
+      std::string current_file_name;
+      const uint32_t current_file_id = file_transfer_.current_file_id_.load();
+      if (current_file_id != 0) {
+        std::lock_guard<std::mutex> lock(
+            file_transfer_.file_transfer_list_mutex_);
+        for (const auto& info : file_transfer_.file_transfer_list_) {
+          if (info.file_id == current_file_id) {
+            current_file_name = info.file_name;
+            break;
+          }
+        }
+      }
+
+      ImGui::BeginTooltip();
+      if (server_windows_system_chinese_font_) {
+        ImGui::PushFont(server_windows_system_chinese_font_);
+      }
+      ImGui::SetWindowFontScale(0.5f);
+      if (!current_file_name.empty()) {
+        ImGui::Text("%s", current_file_name.c_str());
+      }
+      if (total_bytes > 0) {
+        const std::string sent_str = FormatBytes(sent_bytes);
+        const std::string total_str = FormatBytes(total_bytes);
+        ImGui::Text("%s / %s", sent_str.c_str(), total_str.c_str());
+      }
+
+      const float text_height = ImGui::GetTextLineHeight();
+      char overlay[32];
+      std::snprintf(overlay, sizeof(overlay), "%.1f%%", progress * 100.0f);
+      ImGui::ProgressBar(progress, ImVec2(180.0f, text_height), overlay);
+      BitrateDisplay(rate_bps);
+      ImGui::SetWindowFontScale(1.0f);
+      if (server_windows_system_chinese_font_) {
+        ImGui::PopFont();
+      }
+      ImGui::EndTooltip();
+    }
+  }
+
   ImGui::SetWindowFontScale(1.0f);
 
   ImGui::EndChild();