// Change the coloring to c, but only in those bits where m is 1.
func (w *Wrapper) SetMask(c Color, m uint16) error {
current := w32.GetConsoleScreenBufferInfo(w.h)
if current == nil {
return syscall.Errno(w32.GetLastError())
}
if !w32.SetConsoleTextAttribute(w.h, apply(current.WAttributes, uint16(c), uint16(m))) {
return syscall.Errno(w32.GetLastError())
}
return nil
}
// Save saves the current coloring so that it can be Restored later.
func (w *Wrapper) Save() error {
w.saved = w32.GetConsoleScreenBufferInfo(w.h)
if w.saved == nil {
return syscall.Errno(w32.GetLastError())
}
return nil
}
// Restore restores a previously Saved coloring. It is an error to call Restore
// without ever having called Save.
func (w *Wrapper) Restore() error {
if w.saved == nil {
return errors.New("attempted to restore without saving.")
}
if !w32.SetConsoleTextAttribute(w.h, w.saved.WAttributes) {
return syscall.Errno(w32.GetLastError())
}
return nil
}