feat(display): Add revert display config on disconnect option (#3613)

docs/configuration.md

@@ -1203,6 +1203,31 @@ editing the `conf` file in a text editor. Use the examples as reference.
     </tr>
 </table>
 
+
+### dd_config_revert_on_disconnect
+
+<table>
+    <tr>
+        <td>Description</td>
+        <td colspan="2">
+            When enabled, display configuration is reverted upon disconnect of all clients instead of app close or last session termination.
+            This can be useful for returning to physical usage of the host machine without closing the active app.
+            @warning{Some applications may not function properly when display configuration is changed while active.}
+            @note{Applies to Windows only.}
+        </td>
+    </tr>
+    <tr>
+        <td>Default</td>
+        <td colspan="2">@code{}disabled@endcode</td>
+    </tr>
+    <tr>
+        <td>Example</td>
+        <td colspan="2">@code{}
+            dd_config_revert_on_disconnect = enabled
+            @endcode</td>
+    </tr>
+</table>
+
 ### dd_mode_remapping
 
 <table>

src/config.cpp

@@ -504,6 +504,7 @@ namespace config {
       {},  // manual_refresh_rate
       video_t::dd_t::hdr_option_e::automatic,  // hdr_option
       3s,  // config_revert_delay
+      {},  // config_revert_on_disconnect
       {},  // mode_remapping
       {}  // wa
     },  // display_device
@@ -1132,6 +1133,7 @@ namespace config {
         video.dd.config_revert_delay = std::chrono::milliseconds {value};
       }
     }
+    bool_f(vars, "dd_config_revert_on_disconnect", video.dd.config_revert_on_disconnect);
     generic_f(vars, "dd_mode_remapping", video.dd.mode_remapping, dd::mode_remapping_from_view);
     bool_f(vars, "dd_wa_hdr_toggle", video.dd.wa.hdr_toggle);
 

src/config.h

@@ -132,6 +132,7 @@ namespace config {
       std::string manual_refresh_rate;  ///< Manual refresh rate in case `refresh_rate_option == refresh_rate_option_e::manual`.
       hdr_option_e hdr_option;
       std::chrono::milliseconds config_revert_delay;  ///< Time to wait until settings are reverted (after stream ends/app exists).
+      bool config_revert_on_disconnect;  ///< Specify whether to revert display configuration on client disconnect.
       mode_remapping_t mode_remapping;
       workarounds_t wa;
     } dd;

src/stream.cpp

@@ -1882,11 +1882,17 @@ namespace stream {
 
       // If this is the last session, invoke the platform callbacks
       if (--running_sessions == 0) {
+        bool revert_display_config {config::video.dd.config_revert_on_disconnect};
         if (proc::proc.running()) {
 #if defined SUNSHINE_TRAY && SUNSHINE_TRAY >= 1
           system_tray::update_tray_pausing(proc::proc.get_last_run_app_name());
 #endif
         } else {
+          // We have no app running and also no clients anymore.
+          revert_display_config = true;
+        }
+
+        if (revert_display_config) {
           display_device::revert_configuration();
         }
 

src_assets/common/assets/web/config.html

@@ -175,6 +175,7 @@
               "dd_manual_refresh_rate": "",
               "dd_hdr_option": "auto",
               "dd_config_revert_delay": 3000,
+              "dd_config_revert_on_disconnect": "disabled",
               "dd_mode_remapping": {"mixed": [], "resolution_only": [], "refresh_rate_only": []},
               "dd_wa_hdr_toggle": "disabled",
               "min_fps_factor": 1,

src_assets/common/assets/web/configs/tabs/audiovideo/DisplayDeviceOptions.vue

@@ -151,6 +151,15 @@ function addRemappingEntry() {
                 </div>
               </div>
 
+              <!-- Config revert on disconnect -->
+              <div class="mb-3" v-if="config.dd_configuration_option !== 'disabled'">
+                <Checkbox id="dd_config_revert_on_disconnect"
+                  locale-prefix="config"
+                  v-model="config.dd_config_revert_on_disconnect"
+                  default="false"
+                ></Checkbox>
+              </div>
+
               <!-- Display mode remapping -->
               <div class="mb-3" v-if="canBeRemapped()">
                 <label for="dd_mode_remapping" class="form-label">

src_assets/common/assets/web/public/assets/locale/en.json

@@ -158,6 +158,8 @@
     "dd_config_label": "Device configuration",
     "dd_config_revert_delay": "Config revert delay",
     "dd_config_revert_delay_desc": "Additional delay in milliseconds to wait before reverting configuration when the app has been closed or the last session terminated. Main purpose is to provide a smoother transition when quickly switching between apps.",
+    "dd_config_revert_on_disconnect": "Config revert on disconnect",
+    "dd_config_revert_on_disconnect_desc": "Revert configuration upon disconnect of all clients instead of app close or last session termination.",
     "dd_config_verify_only": "Verify that the display is enabled (default)",
     "dd_hdr_option": "HDR",
     "dd_hdr_option_auto": "Switch on/off the HDR mode as requested by the client (default)",