2 files changed, 34 insertions, 3 deletions
diff --git a/graphics/composer/2.1/utils/hwc2onfbadapter/HWC2OnFbAdapter.cpp b/graphics/composer/2.1/utils/hwc2onfbadapter/HWC2OnFbAdapter.cpp
index 7c9e6518b..0f5057756 100644
--- a/graphics/composer/2.1/utils/hwc2onfbadapter/HWC2OnFbAdapter.cpp
+++ b/graphics/composer/2.1/utils/hwc2onfbadapter/HWC2OnFbAdapter.cpp
@@ -32,6 +32,8 @@
 #include <log/log.h>
 #include <sync/sync.h>
 
+using namespace HWC2;
+
 namespace android {
 
 namespace {
@@ -629,9 +631,10 @@ hwc2_function_pointer_t getFunctionHook(hwc2_device_t* /*device*/, int32_t descr
     }
 }
 
-void getCapabilitiesHook(hwc2_device_t* /*device*/, uint32_t* outCount,
-                         int32_t* /*outCapabilities*/) {
-    *outCount = 0;
+void getCapabilitiesHook(hwc2_device_t* device, uint32_t* outCount,
+                         int32_t* outCapabilities) {
+    auto& adapter = HWC2OnFbAdapter::cast(device);
+    adapter.getCapabilities(outCount, outCapabilities);
 }
 
 int closeHook(hw_device_t* device) {
@@ -656,6 +659,10 @@ HWC2OnFbAdapter::HWC2OnFbAdapter(framebuffer_device_t* fbDevice)
     mFbInfo.xdpi_scaled = int(mFbDevice->xdpi * 1000.0f);
     mFbInfo.ydpi_scaled = int(mFbDevice->ydpi * 1000.0f);
 
+    // Present fences aren't supported, always indicate PresentFenceIsNotReliable
+    // for FB devices
+    mCapabilities.insert(Capability::PresentFenceIsNotReliable);
+
     mVsyncThread.start(0, mFbInfo.vsync_period_ns);
 }
 
@@ -791,6 +798,23 @@ void HWC2OnFbAdapter::enableVsync(bool enable) {
     mVsyncThread.enableCallback(enable);
 }
 
+void HWC2OnFbAdapter::getCapabilities(uint32_t* outCount,
+                                      int32_t* outCapabilities) {
+    if (outCapabilities == nullptr) {
+        *outCount = mCapabilities.size();
+        return;
+    }
+
+    auto capabilityIter = mCapabilities.cbegin();
+    for (size_t written = 0; written < *outCount; ++written) {
+        if (capabilityIter == mCapabilities.cend()) {
+            return;
+        }
+        outCapabilities[written] = static_cast<int32_t>(*capabilityIter);
+        ++capabilityIter;
+    }
+}
+
 int64_t HWC2OnFbAdapter::VsyncThread::now() {
     struct timespec ts;
     clock_gettime(CLOCK_MONOTONIC, &ts);
diff --git a/graphics/composer/2.1/utils/hwc2onfbadapter/include/hwc2onfbadapter/HWC2OnFbAdapter.h b/graphics/composer/2.1/utils/hwc2onfbadapter/include/hwc2onfbadapter/HWC2OnFbAdapter.h
index d6272fdb1..f1f11ef2b 100644
--- a/graphics/composer/2.1/utils/hwc2onfbadapter/include/hwc2onfbadapter/HWC2OnFbAdapter.h
+++ b/graphics/composer/2.1/utils/hwc2onfbadapter/include/hwc2onfbadapter/HWC2OnFbAdapter.h
@@ -23,7 +23,11 @@
 #include <thread>
 #include <unordered_set>
 
+#define HWC2_INCLUDE_STRINGIFICATION
+#define HWC2_USE_CPP11
 #include <hardware/hwcomposer2.h>
+#undef HWC2_INCLUDE_STRINGIFICATION
+#undef HWC2_USE_CPP11
 
 struct framebuffer_device_t;
 
@@ -75,6 +79,7 @@ public:
 
     void setVsyncCallback(HWC2_PFN_VSYNC callback, hwc2_callback_data_t data);
     void enableVsync(bool enable);
+    void getCapabilities(uint32_t* outCount, int32_t* outCapabilities);
 
 private:
     framebuffer_device_t* mFbDevice{nullptr};
@@ -90,6 +95,8 @@ private:
 
     buffer_handle_t mBuffer{nullptr};
 
+    std::unordered_set<HWC2::Capability> mCapabilities;
+
     class VsyncThread {
     public:
         static int64_t now();