[Mono-dev] slow Lockbits

[sebi77]

  Hi all!

Our Mono app. significantly slows down on Linux. We figured out that
Lockbits cause this. 
I don't know this problem is a bug, or we can avoid it with memory
management.
What actually happens during LockBits?

http://bugzilla.xamarin.com/show_bug.cgi?id=1819

DateTime start = DateTime.Now;
for (int i = 0; i < 1000; i++)
{
	Bitmap b = new Bitmap(640, 480);
	BitmapData d = b.LockBits(new System.Drawing.Rectangle(0, 0,
		b.Width, b.Height), ImageLockMode.ReadOnly, b.PixelFormat);
	b.UnlockBits(d);
	b.Dispose();   
}
string s = (DateTime.Now - start).TotalMilliseconds.ToString();
Console.WriteLine(s);

Win + .Net:             720 ms
Win + Mono 10.2.3:  750 ms
Lin + Mono:             5000 ms

Sebi

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