Simple Overlay Program

[Krocket]

2x2 pixels (or whatever I hope to edit it later) centered on my screen which will invert every color behind it. I currently use a program where I can upload any image to it and it will overlay on my primary monitor so I can use that image as my crosshair in all my main games, but I'd like to figure out how to create a simple program to do that on my own which I could add inversion to. Minecraft has something similar to this, whatever you look at the crosshair will show a little of what's behind it and it's inverted color.

 

Sorry if that was confusing

[Nuluvius]

Well I had a quick look and found a few things. Not paying attention to the language implementation specifically just the principals of what's going on. See if anything looks interesting to you. I certainly haven't had the time to actually go ahead and play with anything.

 

http://stackoverflow.com/questions/18141976/how-to-invert-an-rgb-color-in-integer-form

http://stackoverflow.com/questions/1165107/how-do-i-invert-a-colour-color-c-net

http://en.wikipedia.org/wiki/HSL_and_HSV#Conversion%5Ffrom%5FRGB%5Fto%5FHSL%5For%5FHSV

http://stackoverflow.com/questions/541331/effective-way-of-making-negative-of-image-without-external-dlls

 

Your other option of course is to take a look in the Minecraft source code (since you've seen what you want there), I can't personally remember if the crosshair code is obfuscated or not. I do seem to recall that the GUI isn't so you might well be in luck.

[SuperUser]

Some anti cheat programmes may check for an overlay and will ban/kick you from the game.

If you still want to proceed seach for "external overlay c++" to find out more about drawing an overlay.

Then do something like this:

for each frame  Get pixel color in the center of the screen.  Invert color.  Draw lines using inverted color.

Hope this helps.