FastPix: Rapid Pixel Processing for Dummies and Dudes

[boops boops]

I don't know if this will be seen, but I was wondering whether the timing was done with Integer Overflow Checks on or off? This code seems like it would really benefit from having them off, which should be safe to do. That might get you a couple more x in speed (to explain that odd statement, I'm making a reference to the fact that you already have 100x, so this might add a few more x).

In the conditions under which I originally tested it (WinXP sp3, VB2008 express/.Net 3.5) it didn't make any apparent difference. As is often the case, a different OS/Framework version could have a significant effect. Incidentally, measuring only the pixel processing and not the time to instantiate/dispose the Fastpix object gave a speed gain of around 250x compared to GetPixel/SetPixel for image colour inversion; that might be relevant when successive operations have to be done on the same bitmap.

In case you are interested, the VB2008 test rig I used for checking these assertions is attached. It's a bit ramshackle but I hope it will be self-explanatory. I had a default test image in the Resources folder but the forum wouldn't let me include it in the zip file. I've attached it separately in case it's needed, but you can load your own images. Comments and criticisms of the actual testing assumptions are of course welcome.

BB