add WriteUnmanagedSpan

src/core/hle/service/nvnflinger/buffer_queue_producer.cpp

@@ -984,9 +984,7 @@ void BufferQueueProducer::Transact(u32 code, std::span<const u8> parcel_data,
 
         parcel_out.Write(status);
         parcel_out.Write<s32>(static_cast<s32>(history.size()));
-        for (const auto& rec : history) {
-            parcel_out.Write(rec);
-        }
+        parcel_out.WriteUnmanagedSpan<BufferHistoryInfo>(history);
         break;
     }
     default:

src/core/hle/service/nvnflinger/parcel.h

@@ -129,6 +129,23 @@ public:
         this->WriteImpl(val, m_data_buffer);
     }
 
+    template <typename T>
+    void WriteUnmanagedSpan(std::span<const T> values) {
+        static_assert(std::is_trivially_copyable_v<T>, "T must be trivially copyable.");
+        if (values.empty()) {
+            return;
+        }
+
+        const size_t bytes = values.size_bytes();
+        const size_t old_size = m_data_buffer.size();
+        m_data_buffer.resize(old_size + bytes);
+        std::memcpy(m_data_buffer.data() + old_size, values.data(), bytes);
+
+        // Align the parcel stream once after the whole span.
+        const size_t aligned = Common::AlignUp(m_data_buffer.size(), 4);
+        m_data_buffer.resize(aligned);
+    }
+
     template <typename T>
     void WriteFlattenedObject(const T* ptr) {
         if (!ptr) {