This project was done for my Computer Science A-level, in 2017. The main difficulty was navigating UWP, the first time I'd had to work with a huge third-party interface. There are parts of the project that I'm not exceptionally proud of, either because they're slightly dirty or because they appear inefficient, but I was very new to Windows programming and of course had to get the project completed to a schedule.
The bulk of the code of interest is in BitmapManipulation.cpp and MainPage.xaml.cpp, and the headers and MainPage.xaml will give a sense of the structure. If attempting to build, please install the certificate in the install folder to Local Machine -> Trusted People; you will likely need to install the build tools also.
In case it's of interest, I've found a video of the program in use, made for testing purposes: https://www.youtube.com/watch?v=o7TiP38t8TQ. The numbers refer to test cases, ignore them!