How do you draw a string to an image in winRT? In WinForms that could be done using drawstring() method inside the system.drawing name
winRT
drawstring()
system.drawing
Direct2D is a replacement for GDI in WinRT. So you'll have to use C++/CX with DirectX for drawing text.
I don't have any examples for you, but maybe this link (and the links included) can help you on your way.