In addition, I failed to find how Perl Cairo module wraps cairo_t. In its typemap, there's no entry for it: 
# content of "cairo-perl.typemap"
const char *            T_PV

char_utf8 *             T_PV_UTF8
const char_utf8 *       T_PV_UTF8

cairo_bool_t            T_UV

cairo_font_extents_t *  T_CAIRO_FONT_EXTENTS
cairo_text_extents_t *  T_CAIRO_TEXT_EXTENTS
cairo_glyph_t *         T_CAIRO_GLYPH
cairo_text_cluster_t *  T_CAIRO_TEXT_CLUSTER
cairo_path_t *          T_CAIRO_PATH

FT_Face                 T_FT_FACE

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In reply to Re: How to let my XS module interact with existing XS module? by llancet
in thread How to let my XS module interact with existing XS module? by llancet

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