using Microsoft.ML.OnnxRuntime.Tensors;
using Microsoft.ML.OnnxRuntime;
using OpenCvSharp;
using System;
using System.Collections.Generic;
using System.Windows.Forms;
using System.Linq;
using System.Drawing;
using static System.Net.Mime.MediaTypeNames;
 
namespace Onnx_Demo
{
    public partial class frmMain : Form
    {
        public frmMain()
        {
            InitializeComponent();
        }
 
        string fileFilter = "*.*|*.bmp;*.jpg;*.jpeg;*.tiff;*.tiff;*.png";
        string image_path = "";
 
        DateTime dt1 = DateTime.Now;
        DateTime dt2 = DateTime.Now;
 
        int inpWidth;
        int inpHeight;
 
        int outHeight, outWidth;
 
        Mat image;
 
        string model_path = "";
 
        SessionOptions options;
        InferenceSession onnx_session;
        Tensor<float> input_tensor;
        Tensor<float> mask_tensor;
        List<NamedOnnxValue> input_ontainer;
 
        IDisposableReadOnlyCollection<DisposableNamedOnnxValue> result_infer;
        DisposableNamedOnnxValue[] results_onnxvalue;
 
        private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = fileFilter;
            if (ofd.ShowDialog() != DialogResult.OK) return;
 
            pictureBox1.Image = null;
            pictureBox2.Image = null;
            textBox1.Text = "";
 
            image_path = ofd.FileName;
            pictureBox1.Image = new System.Drawing.Bitmap(image_path);
            image = new Mat(image_path);
        }
 
        private void Form1_Load(object sender, EventArgs e)
        {
            // 創(chuàng)建輸入容器
            input_ontainer = new List<NamedOnnxValue>();
 
            // 創(chuàng)建輸出會話
            options = new SessionOptions();
            options.LogSeverityLevel = OrtLoggingLevel.ORT_LOGGING_LEVEL_INFO;
            options.AppendExecutionProvider_CPU(0);// 設(shè)置為CPU上運行
 
            // 創(chuàng)建推理模型類，讀取本地模型文件
            model_path = "model/isnet_general_use_480x640.onnx";
 
            inpHeight = 480;
            inpWidth = 640;
 
            outHeight = 480;
            outWidth = 640;
 
            onnx_session = new InferenceSession(model_path, options);
 
            // 創(chuàng)建輸入容器
            input_ontainer = new List<NamedOnnxValue>();
 
            image_path = "test_img/bike.jpg";
            pictureBox1.Image = new Bitmap(image_path);
 
        }
 
        private unsafe void button2_Click(object sender, EventArgs e)
        {
            if (image_path == "")
            {
                return;
            }
            textBox1.Text = "檢測中，請稍等……";
            pictureBox2.Image = null;
            System.Windows.Forms.Application.DoEvents();
 
            image = new Mat(image_path);
 
            Mat resize_image = new Mat();
            Cv2.Resize(image, resize_image, new OpenCvSharp.Size(inpWidth, inpHeight));
 
            float[] input_tensor_data = new float[1 * 3 * inpWidth * inpHeight];
 
            for (int c = 0; c < 3; c++)
            {
                for (int i = 0; i < inpHeight; i++)
                {
                    for (int j = 0; j < inpWidth; j++)
                    {
                        float pix = ((byte*)(resize_image.Ptr(i).ToPointer()))[j * 3 + 2 - c];
                        input_tensor_data[c * inpHeight * inpWidth + i * inpWidth + j] = (float)(pix / 255.0 - 0.5);
                    }
                }
            }
 
            input_tensor = new DenseTensor<float>(input_tensor_data, new[] { 1, 3, inpHeight, inpWidth });
 
            //將 input_tensor 放入一個輸入?yún)?shù)的容器，并指定名稱
            input_ontainer.Add(NamedOnnxValue.CreateFromTensor("input", input_tensor));
 
            dt1 = DateTime.Now;
            //運行 Inference 并獲取結(jié)果
            result_infer = onnx_session.Run(input_ontainer);
            dt2 = DateTime.Now;
 
            //將輸出結(jié)果轉(zhuǎn)為DisposableNamedOnnxValue數(shù)組
            results_onnxvalue = result_infer.ToArray();
 
            float[] pred = results_onnxvalue[0].AsTensor<float>().ToArray();
 
            Mat mask = new Mat(outHeight, outWidth, MatType.CV_32FC1, pred);
            double min_value, max_value;
            Cv2.MinMaxLoc(mask, out min_value, out max_value);
 
            mask = (mask - min_value) / (max_value - min_value);
 
            mask *= 255;
            mask.ConvertTo(mask, MatType.CV_8UC1);
 
            Cv2.Resize(mask, mask, new OpenCvSharp.Size(image.Cols, image.Rows));
 
            Mat result_image = mask.Clone();
 
            if (pictureBox2.Image != null)
            {
                pictureBox2.Image.Dispose();
            }
 
            pictureBox2.Image = new System.Drawing.Bitmap(result_image.ToMemoryStream());
            textBox1.Text = "推理耗時:" + (dt2 - dt1).TotalMilliseconds + "ms";
 
            mask.Dispose();
            image.Dispose();
            resize_image.Dispose();
            result_image.Dispose();
        }
 
        private void pictureBox2_DoubleClick(object sender, EventArgs e)
        {
            Common.ShowNormalImg(pictureBox2.Image);
        }
 
        private void pictureBox1_DoubleClick(object sender, EventArgs e)
        {
            Common.ShowNormalImg(pictureBox1.Image);
        }
    }
}