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  1. using System;
  2. using System.Collections.Generic;
  3. using System.Threading.Tasks;
  4. using System.Windows;
  5. using System.Windows.Media.Imaging;
  6. using System.IO;
  7. using System.Diagnostics;
  8. using System.Collections.Concurrent;
  9.  
  10. namespace BitmapImageSpeed
  11. {
  12.     public partial class MainWindow : Window
  13.     {
  14.         public MainWindow()
  15.         {
  16.             InitializeComponent();
  17.  
  18.             const string path1 = @"K:\同人\[ひぐま屋] もしも近所にHなサービスをしてくれる銭湯があったら\0title.jpg";
  19.             const string path2 = @"M:\Pictures\RYLSKY_ART\aaliyah-love\178894\00.jpg";
  20.             const int count = 10;
  21.  
  22.             Debug.Print("Without Scaling");
  23.             putDecodeTime(path1, doTest1, count);
  24.             putDecodeTime(path2, doTest1, count);
  25.  
  26.             //Debug.Print("With Scaling");
  27.             //putDecodeTime(path1, doTest2, count);
  28.             //putDecodeTime(path2, doTest2, count);
  29.  
  30.             image1.Source = new BitmapImage(new Uri(path1));
  31.         }
  32.  
  33.         private void putDecodeTime(string path, Action<byte[]> act, int count = 10)
  34.         {
  35.             var data = File.ReadAllBytes(path);
  36.  
  37.             var time_ms = getTime(() =>
  38.             {
  39.                 var bag = new List<Task>();
  40.                 var x = new ConcurrentBag<double>();
  41.                 for (int i = 0; i < count; ++i)
  42.                 {
  43.                     bag.Add(Task.Run(() => x.Add(getTime(() => act(data)))));
  44.                     //act(data);
  45.                 }
  46.                 Task.WaitAll(bag.ToArray());
  47.                 return;
  48.             });
  49.  
  50.             Debug.Print($"{time_ms / count} ms");
  51.         }
  52.  
  53.         private double getTime(Action act)
  54.         {
  55.             var st = new Stopwatch();
  56.             st.Start();
  57.  
  58.             act();
  59.  
  60.             st.Stop();
  61.             return st.Elapsed.Ticks / 10000;
  62.         }
  63.  
  64.         private void doTest1(byte[] data)
  65.         {
  66.             using (var ms = new MemoryStream(data))
  67.             {
  68.                 var image = new BitmapImage();
  69.                 image.BeginInit();
  70.                 image.StreamSource = ms;
  71.                 image.CreateOptions = BitmapCreateOptions.IgnoreColorProfile;
  72.                 image.CacheOption = BitmapCacheOption.OnLoad;
  73.                 image.EndInit();
  74.                 image.Freeze();
  75.             }
  76.         }
  77.  
  78.         private void doTest2(byte[] data)
  79.         {
  80.             using (var ms = new MemoryStream(data))
  81.             {
  82.                 var image = new BitmapImage();
  83.                 image.BeginInit();
  84.                 image.StreamSource = ms;
  85.                 image.CacheOption = BitmapCacheOption.OnLoad;
  86.  
  87.                 /* !!! */
  88.                 image.DecodePixelHeight = 128;
  89.  
  90.                 image.EndInit();
  91.                 image.Freeze();
  92.             }
  93.         }
  94.     }
  95. }
  96.  
Compilation error #stdin compilation error #stdout 0s 0KB
comments ()
stdin
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Standard input is empty
compilation info 
prog.cs(5,22): error CS0234: The type or namespace name `Media' does not exist in the namespace `System.Windows'. Are you missing an assembly reference?
prog.cs(12,39): error CS0246: The type or namespace name `Window' could not be found. Are you missing an assembly reference?
Compilation failed: 2 error(s), 0 warnings
stdout
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Standard output is empty
https://ideone.com/6iePK6
language:
C# (gmcs 5.20.1)
created:
7 years ago
visibility:
public

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