renderer -- a gtk:cell-renderer object to operate on
cell -- a gdk:rectangle area allocated to renderer inside the rectangle provided to the gtk:cell-area-foreach-alloc function
background -- a gdk:rectangle background area for renderer inside the background area provided to the gtk:cell-area-foreach-alloc function
result -- true to stop iterating over cells

The type of the callback function used for iterating over the cell renderers of a gtk:cell-area object, see the gtk:cell-area-foreach-alloc function.