I'd like to develop app similar to Windows full screen zoom feature but with multi-screen support.
How can I access and transform screen contents in efficient way? The best solution would be to have ability to get pixel matrix and do some operations on the matrix to set final pixel colours.
For example I'd like to show on monitor one (from pixel 0,0 to 1920,1024) pixels from 0,0 to 960,512 and on screen 2 (pixels 0,1921 - 3840,1024 some other source rectangle. Additionally I'd like to transform bits to enable large contrast or additional mouse position indicator.
Is it possible to plug some piece of code in between some layers in Windows to enable such feature? Or is there any other, possibly easier way to solve the issue.
How is the Windows Magnification API implemented?