fix weird implementation

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

@@ -1,27 +1,37 @@
-// SPDX-FileCopyrightText: Copyright 2025 Eden Emulator Project
-// SPDX-License-Identifier: GPL-3.0-or-later
-
 #pragma once
+
 #include <deque>
 #include <mutex>
 #include <common/assert.h>
 
-struct BufferHistoryEntry { s32 slot; s64 timestamp; s64 frame_number; };
+struct BufferHistoryEntry {
-
+    s32 slot;
-class BufferHistoryManager { public: void PushEntry(s32 slot, s64 timestamp, s64 frame_number) { std::lock_guardstd::mutex lock(mutex_); if (entries_.size() >= kMaxHistorySize) entries_.pop_front();
+    s64 timestamp;
+    s64 frame_number;
+};
 
+class BufferHistoryManager {
+public:
+    void PushEntry(s32 slot, s64 timestamp, s64 frame_number) {
+        std::lock_guard<std::mutex> lock(mutex_);
+        if (entries_.size() >= kMaxHistorySize) {
+            entries_.pop_front();
+        }
         entries_.emplace_back(BufferHistoryEntry{slot, timestamp, frame_number});
     }
 
     s32 GetHistory(std::span<BufferHistoryEntry> out_entries) {
         std::lock_guard<std::mutex> lock(mutex_);
-
+        s32 count =
-    s32 count = std::min(static_cast<s32>(entries_.size()), static_cast<s32>(out_entries.size()));
+            std::min<s32>(static_cast<s32>(entries_.size()), static_cast<s32>(out_entries.size()));
-
+        for (s32 i = 0; i < count; ++i) {
-    for (s32 i = 0; i < count; ++i)
             out_entries[i] = entries_[entries_.size() - count + i];
-
+        }
         return count;
     }
 
-private: static constexpr size_t kMaxHistorySize = 16; std::deque<BufferHistoryEntry> entries_; std::mutex mutex_; };
+private:
+    static constexpr size_t kMaxHistorySize = 16;
+    std::deque<BufferHistoryEntry> entries_;
+    std::mutex mutex_;
+};

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

@@ -928,9 +928,13 @@ void BufferQueueProducer::Transact(u32 code, std::span<const u8> parcel_data,
     }
     case TransactionId::GetBufferHistory: {
         LOG_DEBUG(Service_Nvnflinger, "GetBufferHistory");
-        auto out_span = request.PopRaw<std::span<BufferHistoryEntry>>();
+        auto out_span = parcel_in.Read<std::span<BufferHistoryEntry>>();
         s32 count = buffer_history_.GetHistory(out_span);
-        response.Push(s32(count));
+        parcel_out.Write(s32(count));
+        break;
+    }
+    default:
+        ASSERT_MSG(false, "Unimplemented TransactionId {}", code);
         break;
     }
 

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

@@ -20,6 +20,7 @@
 #include "core/hle/service/nvnflinger/buffer_slot.h"
 #include "core/hle/service/nvnflinger/graphic_buffer_producer.h"
 #include "core/hle/service/nvnflinger/pixel_format.h"
+#include "core/hle/service/nvnflinger/buffer_history.h"
 #include "core/hle/service/nvnflinger/status.h"
 #include "core/hle/service/nvnflinger/window.h"
 
@@ -84,7 +85,6 @@ private:
     std::shared_ptr<BufferQueueCore> core;
     BufferQueueDefs::SlotsType& slots;
     BufferHistoryManager buffer_history_;
-    buffer_history_.PushEntry(slot, timestamp, frame_number);
     u32 sticky_transform{};
     std::mutex callback_mutex;
     s32 next_callback_ticket{};