Code review comment for lp:~mir-team/mir/cursor-spike-phase-1-resubmit

This suggests:

class CursorTheme
{
public:

virtual std::unique_ptr<CursorImage> lookup_cursor(std::string const& name, geometry::Size const& size) const = 0;
}

Plus

class XCursorTheme : public CursorTheme
{
public:
XCursorTheme(std::string const& name);
}
?