Enable refreshrate indicator on external display.

- Add flag for it as well.

Bug: 301647974
Test: play with external monitor; adb shell device_config put
core_graphics
com.android.graphics.surfaceflinger.flags.refresh_rate_overlay_on_external_display
true

Change-Id: I530a7a74b2ec7be1c1a35a1310c87e073764c77a

4 files changed, 11 insertions, 1 deletions

diff --git a/services/surfaceflinger/FlagManager.cpp b/services/surfaceflinger/FlagManager.cpp
index 6d0dbc7978..13b8a6c0cf 100644
--- a/services/surfaceflinger/FlagManager.cpp
+++ b/services/surfaceflinger/FlagManager.cpp
@@ -110,6 +110,7 @@ void FlagManager::dump(std::string& result) const {
     /// Trunk stable server flags ///
     DUMP_SERVER_FLAG(late_boot_misc2);
     DUMP_SERVER_FLAG(dont_skip_on_early);
+    DUMP_SERVER_FLAG(refresh_rate_overlay_on_external_display);
 
     /// Trunk stable readonly flags ///
     DUMP_READ_ONLY_FLAG(connected_display);
@@ -190,6 +191,7 @@ FLAG_MANAGER_READ_ONLY_FLAG(multithreaded_present, "debug.sf.multithreaded_prese
 
 /// Trunk stable server flags ///
 FLAG_MANAGER_SERVER_FLAG(late_boot_misc2, "")
+FLAG_MANAGER_SERVER_FLAG(refresh_rate_overlay_on_external_display, "")
 
 /// Exceptions ///
 bool FlagManager::dont_skip_on_early() const {
diff --git a/services/surfaceflinger/FlagManager.h b/services/surfaceflinger/FlagManager.h
index cefce9bcda..e3e4f80905 100644
--- a/services/surfaceflinger/FlagManager.h
+++ b/services/surfaceflinger/FlagManager.h
@@ -49,6 +49,7 @@ public:
     /// Trunk stable server flags ///
     bool late_boot_misc2() const;
     bool dont_skip_on_early() const;
+    bool refresh_rate_overlay_on_external_display() const;
 
     /// Trunk stable readonly flags ///
     bool connected_display() const;
diff --git a/services/surfaceflinger/SurfaceFlinger.cpp b/services/surfaceflinger/SurfaceFlinger.cpp
index 4d02b44201..4808075a02 100644
--- a/services/surfaceflinger/SurfaceFlinger.cpp
+++ b/services/surfaceflinger/SurfaceFlinger.cpp
@@ -8413,7 +8413,8 @@ status_t SurfaceFlinger::setSmallAreaDetectionThreshold(int32_t appId, float thr
 void SurfaceFlinger::enableRefreshRateOverlay(bool enable) {
     bool setByHwc = getHwComposer().hasCapability(Capability::REFRESH_RATE_CHANGED_CALLBACK_DEBUG);
     for (const auto& [id, display] : mPhysicalDisplays) {
-        if (display.snapshot().connectionType() == ui::DisplayConnectionType::Internal) {
+        if (display.snapshot().connectionType() == ui::DisplayConnectionType::Internal ||
+            FlagManager::getInstance().refresh_rate_overlay_on_external_display()) {
             if (const auto device = getDisplayDeviceLocked(id)) {
                 const auto enableOverlay = [&](const bool setByHwc) FTL_FAKE_GUARD(
                                                    kMainThreadContext) {
diff --git a/services/surfaceflinger/surfaceflinger_flags.aconfig b/services/surfaceflinger/surfaceflinger_flags.aconfig
index a81f9b80de..bb3c94a4eb 100644
--- a/services/surfaceflinger/surfaceflinger_flags.aconfig
+++ b/services/surfaceflinger/surfaceflinger_flags.aconfig
@@ -70,3 +70,9 @@ flag {
   is_fixed_read_only: true
 }
 
+flag {
+  name: "refresh_rate_overlay_on_external_display"
+  namespace: "core_graphics"
+  description: "enable refresh rate indicator on the external display"
+  bug: "301647974"
+}