Is there a way to double the pixel size of a window, and only that window, that draws to the screen using GDI?
Do you mean:
- Change the DPI of the window? The answer is no.
- Change the dimensions of the window? The answer is yes via GetWindowPos/SetWindowPos.
- Zoom the window? Not unless you're using Direct2D/DirectX (in which case you can use a shader). You have to do this yourself.