Optimization of the WPF C# peak algorim

[meriah]

Hello, there's a way to get a set of brightness from BitmapSource to further analyse:

public const float CoeffColor = ((float)100 / 255 * 3) / 10000;
//...
arrayPixelsImage = new byte[SizeArrayPixels];
source.CopyPixels(arrayPixelsImage, StriteImage, 0); //typeof(source) == BitmapSource
float[,] massBrightness = new float[WidthImage, HeightImage];
Parallel.For(0, WidthImage, x =>
{
    for (int y = 0; y < HeightImage; y++)
    {
        int indx = y * WidthImage * 4 + 4 * x;
        float brightness = (float)(arrayPixelsImage[indx] + arrayPixelsImage[indx + 1] + arrayPixelsImage[indx + 2]) * CoeffColor;
        massBrightness[x, y] = brightness;
    }
});
return massBrightness;

Interests how it can be optimized in terms of time of implementation?

[chanisef]

writeableBitmap.Lock();
/* 
в отдельных потоках выполняете обработку.
дожидаетесь завершения потоков.
*/
writeableBitmap.AddDirtyRect(...);
writeableBitmap.Unlock();

also look at the implementation of the methods of the project https://github.com/Microsoft/Win2D