Snapshots the paintable with the given colors.
If less than 4 colors are provided, GTK will pad the array with default colors.
| this |
a `GtkSymbolicPaintable` |
| snapshot |
a `GdkSnapshot` to snapshot to |
| width |
width to snapshot in |
| height |
height to snapshot in |
| colors |
a pointer to an array of colors |
| n_colors |
The number of colors |