title: Save a list of QPixmaps to .ico file
body: <p>I'm interested in creating a single .ico file (with transparency) from a list of <code>QPixmap</code> images (with sizes 16x16, 32x32, 48x48...). I haven't seen any related  method in Qt's documentation: <code>QPixmap</code>, <code>QImage</code>, <code>QIcon</code> (which is for storing images for UI states, not related to the file format)...</p>
  
  <p>Does Qt has such functionality? How can I save such file? May be mixing with Windows API?</p>
  
  <p>PS: A low-level solution would be to directly write the <a href="https://en.wikipedia.org/wiki/ICO_(file_format)" rel="nofollow noreferrer">.ico file</a>, but I'm more interested in not reinventing the wheel if possible.</p>