Unity中Zxing生成二维码只能生成256大小图片的解决方案

/// <summary>
    /// 生成2维码 方法
    /// 经测试：能生成任意尺寸的正方形
    /// </summary>
    /// <param name="content"></param>
    /// <param name="width"></param>
    /// <param name="height"></param>
    public static void GenerateQRCode2(string _qrcodeText, int _width, int _height, Action<Texture2D> _OnGenerateQRCode)
    {
        string qrcodeText = _qrcodeText;
        int width = _width;
        int height = _height;
        Action<Texture2D> OnGenerateQRCode = _OnGenerateQRCode;

        if (qrcodeText != null)
        {
            Loom.RunAsync(() =>
            {
                try
                {
                    // 编码成color32
                    MultiFormatWriter writer = new MultiFormatWriter();
                    Dictionary<EncodeHintType, object> hints = new Dictionary<EncodeHintType, object>();
                    hints.Add(EncodeHintType.CHARACTER_SET, "UTF-8");
                    hints.Add(EncodeHintType.MARGIN, 1);
                    hints.Add(EncodeHintType.ERROR_CORRECTION, ZXing.QrCode.Internal.ErrorCorrectionLevel.M);
                    BitMatrix bitMatrix = writer.encode(qrcodeText, BarcodeFormat.QR_CODE, width, height, hints);

                    // 转成texture2d
                    int w = bitMatrix.Width;
                    int h = bitMatrix.Height;
                  

                    Color32[] color32 = Encode(qrcodeText, width, height);
                    Loom.QueueOnMainThread(() =>
                    {
                        Texture2D texture = new Texture2D(w, h);
                        for (int x = 0; x < h; x++)
                        {
                            for (int y = 0; y < w; y++)
                            {
                                if (bitMatrix[x, y])
                                {
                                    //标志色
                                    texture.SetPixel(y, x, Color.black);
                                }
                                else
                                {
                                    //底色
                                    texture.SetPixel(y, x, Color.white);
                                }
                            }
                        }
                        texture.Apply();
                        if (OnGenerateQRCode != null)
                        {
                            OnGenerateQRCode(texture);
                        }
                    });
                }
                catch (Exception ex)
                {
                    Loom.QueueOnMainThread(() =>
                    {
                        Debug.Log("QRCodeHelper::GenerateQRCode - Exception : " + ex.ToString());
                    });
                }
            });
        }
        else
        {
            if (OnGenerateQRCode != null)
            {
                OnGenerateQRCode(null);
            }
        }
    }

public static void DecodeQRCode(Color32[] _data, int _width, int _height, Action<string> _OnDecodeQRCode)
    {
        Color32[] data = _data;
        int width = _width;
        int height = _height;
        Action<string> OnDecodeQRCode = _OnDecodeQRCode;

        Loom.RunAsync(() =>
        {
            BarcodeReader barcodeReader = new BarcodeReader { AutoRotate = true };
            barcodeReader.Options.TryHarder = true;
            try
            {
                // decode the current frame  
                Result result = barcodeReader.Decode(data, width, height);
                Loom.QueueOnMainThread(() =>
                {
                    if (result != null)
                    {
                        if (OnDecodeQRCode != null)
                        {
                            OnDecodeQRCode(result.Text);
                        }
                    }
                    else
                    {
                        if (OnDecodeQRCode != null)
                        {
                            OnDecodeQRCode(null);
                        }
                    }
                });
            }
            catch
            {
                Loom.QueueOnMainThread(() =>
                {
                    if (OnDecodeQRCode != null)
                    {
                        OnDecodeQRCode(null);
                    }
                });
            }
        });
        // create a reader with a custom luminance source
    }

private static Color32[] Encode(string textForEncoding, int width, int height)
    {
        BarcodeWriter writer = new BarcodeWriter
        {
            Format = BarcodeFormat.QR_CODE,
            Options = new QrCodeEncodingOptions
            {
                Height = height,
                Width = width
            }
        };
        return writer.Write(textForEncoding);
    }