hle: nvflinger: Add implementation for BufferItem class.

src/core/CMakeLists.txt

@@ -538,6 +538,7 @@ add_library(core STATIC
     hle/service/nvflinger/buffer_queue.cpp
     hle/service/nvflinger/buffer_queue.h
     hle/service/nvflinger/binder.h
+    hle/service/nvflinger/buffer_item.h
     hle/service/nvflinger/buffer_queue_defs.h
     hle/service/nvflinger/buffer_transform_flags.h
     hle/service/nvflinger/consumer_listener.h

src/core/hle/service/nvflinger/buffer_item.h

@@ -0,0 +1,46 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+// Copyright 2021 yuzu Emulator Project
+// Copyright 2014 The Android Open Source Project
+// Parts of this implementation were base on:
+// https://cs.android.com/android/platform/superproject/+/android-5.1.1_r38:frameworks/native/include/gui/BufferItem.h
+
+#pragma once
+
+#include <memory>
+
+#include "common/common_types.h"
+#include "core/hle/service/nvflinger/ui/fence.h"
+#include "core/hle/service/nvflinger/ui/rect.h"
+#include "core/hle/service/nvflinger/window.h"
+
+namespace android {
+
+class GraphicBuffer;
+
+class BufferItem final {
+public:
+    constexpr BufferItem() = default;
+
+    std::shared_ptr<GraphicBuffer> graphic_buffer;
+    Fence fence;
+    Rect crop;
+    NativeWindowTransform transform{};
+    u32 scaling_mode{};
+    s64 timestamp{};
+    bool is_auto_timestamp{};
+    u64 frame_number{};
+
+    // The default value for buf, used to indicate this doesn't correspond to a slot.
+    static constexpr s32 INVALID_BUFFER_SLOT = -1;
+    union {
+        s32 slot{INVALID_BUFFER_SLOT};
+        s32 buf;
+    };
+
+    bool is_droppable{};
+    bool acquire_called{};
+    bool transform_to_display_inverse{};
+    s32 swap_interval{};
+};
+
+} // namespace android