Improve jpeg conversion

modules/ANSCV/ANSOpenCV.h

@@ -69,22 +69,25 @@ namespace ANSCENTER
 
 	// Fixed-size pool of NvJpegCompressors (~40MB VRAM each).
 	// Threads that can't acquire an encoder fall back to TurboJPEG.
+	// Fixed pool of NvJpegCompressors sized by GPU VRAM.
+	// Formula: poolSize = VRAM_GB / 2 (min 1, e.g. 2GB→1, 4GB→2, 8GB→4, 10GB→5).
+	// Threads that can't acquire an encoder fall back to TurboJPEG.
 	class NvJpegPool {
 	public:
-		static constexpr int kPoolSize = 4;
 		static NvJpegPool& Instance();
-		// Try to compress with nvJPEG. Returns empty string if no encoder
-		// available or on non-NVIDIA hardware — caller should fall back.
 		[[nodiscard]] std::string tryCompress(const cv::Mat& image, int quality);
 		[[nodiscard]] bool isAvailable() const noexcept { return _available; }
+		[[nodiscard]] int poolSize() const noexcept { return _poolSize; }
 	private:
 		NvJpegPool();
 		~NvJpegPool() = default;
 		NvJpegPool(const NvJpegPool&) = delete;
 		NvJpegPool& operator=(const NvJpegPool&) = delete;
-		bool                                        _available = false;
-		std::array<std::unique_ptr<NvJpegCompressor>, kPoolSize> _encoders;
-		std::array<std::atomic<bool>, kPoolSize>    _inUse;     // lock-free slot flags
+		static int detectPoolSize();
+		bool                                            _available = false;
+		int                                             _poolSize = 0;
+		std::vector<std::unique_ptr<NvJpegCompressor>>  _encoders;
+		std::unique_ptr<std::atomic<bool>[]>            _inUse;   // can't use vector — atomic is non-copyable
 	};
     /// <summary>
 	/// // ANSOPENCV class provides various image processing functionalities using OpenCV and ANS Center SDK.