using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using System.Threading.Tasks;
class Program
{
public static IEnumerable<Color> Pixels(int from, int to)
{
var bm = new Bitmap(@"s:\sample001.png");
for (int y = from; y < to; y++)
{
for (int x = 0; x < bm.Width; x++)
{
yield return bm.GetPixel(x, y);
}
}
}
private static bool isBlack(Color c)
{
return c.B == 0 && c.G == 0 && c.R == 0;
}
private static void count(int fromInclusive, int toExclusive, ref int count, object lockTarget)
{
var q = from n in Pixels(fromInclusive, toExclusive)
where isBlack(n)
select n;
int r = q.Count();
lock (lockTarget) { count += r; }
}
static void Main(string[] args)
{
Object thisLock = new Object();
DateTime start1 = DateTime.Now;
int count1 = 0;
count(0, 1024, ref count1, thisLock);
Console.WriteLine(DateTime.Now - start1);
Console.WriteLine("{0} Black Pixels by single task", count1);
DateTime start2 = DateTime.Now;
int count2 = 0;
Parallel.Invoke(() => count(0, 512, ref count2, thisLock),
() =>count(512, 1024, ref count2, thisLock));
Console.WriteLine(DateTime.Now - start2);
Console.WriteLine("{0} Black Pixels by 2 task", count2);
DateTime start3 = DateTime.Now;
int count3 = 0;
Parallel.Invoke(() =>count(0, 342, ref count3, thisLock),
() => count(342, 682, ref count3, thisLock),
() => count(682, 1024, ref count3, thisLock));
Console.WriteLine(DateTime.Now - start3);
Console.WriteLine("{0} Black Pixels by 3 task", count3);
DateTime start4 = DateTime.Now;
int count4 = 0;
Parallel.Invoke(() =>count(0, 256, ref count4, thisLock),
() => count(256, 512, ref count4, thisLock),
() => count(512, 768, ref count4, thisLock),
() => count(768, 1024, ref count4, thisLock));
Console.WriteLine(DateTime.Now - start4);
Console.WriteLine("{0} Black Pixels by 4 task", count4);
}
}
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