Get hardware buffer IDs.

impeller/toolkit/android/hardware_buffer.cc

@@ -102,4 +102,15 @@ bool HardwareBuffer::IsAvailableOnPlatform() {
          GetProcTable().AHardwareBuffer_allocate.IsAvailable();
 }
 
+std::optional<uint64_t> HardwareBuffer::GetSystemUniqueID() const {
+  if (!IsValid() || !GetProcTable().AHardwareBuffer_getId) {
+    return false;
+  }
+  uint64_t out_id = 0u;
+  if (GetProcTable().AHardwareBuffer_getId(GetHandle(), &out_id) != 0) {
+    return std::nullopt;
+  }
+  return out_id;
+}
+
 }  // namespace impeller::android

impeller/toolkit/android/hardware_buffer.h

@@ -103,6 +103,8 @@ class HardwareBuffer {
 
   const AHardwareBuffer_Desc& GetAndroidDescriptor() const;
 
+  std::optional<uint64_t> GetSystemUniqueID() const;
+
  private:
   struct UniqueAHardwareBufferTraits {
     static AHardwareBuffer* InvalidValue() { return nullptr; }

impeller/toolkit/android/proc_table.h

@@ -27,6 +27,7 @@ namespace impeller::android {
   INVOKE(AHardwareBuffer_release, 26)            \
   INVOKE(AHardwareBuffer_isSupported, 29)        \
   INVOKE(AHardwareBuffer_describe, 26)           \
+  INVOKE(AHardwareBuffer_getId, 31)              \
   INVOKE(ANativeWindow_acquire, 0)               \
   INVOKE(ANativeWindow_release, 0)               \
   INVOKE(ANativeWindow_getWidth, 0)              \

impeller/toolkit/android/toolkit_android_unittests.cc

@@ -43,6 +43,18 @@ TEST_F(ToolkitAndroidTest, CanCreateHardwareBuffer) {
   ASSERT_TRUE(buffer.IsValid());
 }
 
+TEST_F(ToolkitAndroidTest, CanGetHardwareBufferIDs) {
+  ASSERT_TRUE(HardwareBuffer::IsAvailableOnPlatform());
+  if (!GetProcTable().AHardwareBuffer_getId.IsAvailable()) {
+    GTEST_SKIP() << "Hardware buffer IDs are not available on this platform.";
+  }
+  auto desc = HardwareBufferDescriptor::MakeForSwapchainImage({100, 100});
+  ASSERT_TRUE(desc.IsAllocatable());
+  HardwareBuffer buffer(desc);
+  ASSERT_TRUE(buffer.IsValid());
+  ASSERT_TRUE(buffer.GetSystemUniqueID().has_value());
+}
+
 TEST_F(ToolkitAndroidTest, CanApplySurfaceTransaction) {
   ASSERT_TRUE(SurfaceTransaction::IsAvailableOnPlatform());
   SurfaceTransaction transaction;