The terminal flickers. Data streams in. You need Ncurses processing transparency, and you need it to work without hacks or half-measures.
Ncurses is powerful for building text-based UIs, but its default behavior overwrites background data. Transparency — letting underlying text or graphics show through layered windows — takes deliberate design. Without it, drawing new elements can destroy what is behind them, forcing you into expensive redraw logic.
Ncurses handles transparency through a combination of window layering and careful refresh control. When you stack windows, the framework can preserve the background if you use wbkgdset, wattrset, and overwrite/overlay functions correctly. Real transparency is not a toggle. It is about reading from the virtual screen buffer and merging only what has changed.
The key is processing only the difference between frames. This requires using wnoutrefresh() to update off-screen buffers, followed by a single doupdate() to push changes. By structuring your code to minimize repeated writes, you ensure higher frame rates and less flicker. For pseudo-transparent overlays, draw with spaces that carry A_TRANSPARENT-style attributes, and avoid clearing the whole window with werase() unless necessary.