I need a sample DirectX application which will detect if anything changed visually on the screen. It has to be extremely fast so grabbing the screen using GDI and doing a pixel by pixel scan is going to be too slow. My proposed solution is 1) Grab screen using Direct3D using GetFrontBuffer() and store it in a texture within video memory (not system memory.. pulling the screen from video to system memory across the PCI bus is too slow) 2) Compare each pixel using a pixel shader with the pixel from the previous screen grab. If any pixel is different from the previous grab the pixel shader will have some method to indicate that to the application. If you can also determine the coordinates of the change, I'll give you a bonus. For example if a circle popped up on the screen, return the coordinates of the rectangle that bounds the circle to indicate the change area. If you have other ideas, I'm open to suggestions. Please put some details on your ideas/how you plan to do this instead of just saying "Can be done" in your bids. Happy Bidding!
## Deliverables
1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.
2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables):
a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment.
b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request.
3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement).
## Platform
DirectX 8.1, VC++6/2003/2005