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Running gtkdoc-scan (1.29) on this:

typedef cairo_surface_t *
(*cairo_raster_source_acquire_func_t) (cairo_pattern_t *pattern,
				       void *callback_data,
				       cairo_surface_t *target,
				       const cairo_rectangle_int_t *extents);

results in this, the return value is not a pointer:

<USER_FUNCTION>
<NAME>cairo_raster_source_acquire_func_t</NAME>
<RETURNS>cairo_surface_t </RETURNS>
cairo_pattern_t *pattern,
                                       void *callback_data,
                                       cairo_surface_t *target,
                                       const cairo_rectangle_int_t *extents
</USER_FUNCTION>