pattern
. To remove user data from a surface,
call this function with the key that was used to set it and NULL
for data
.cairoPatternSetUserData(pattern, key, user.data)
pattern
key
CairoUserDataKey
] the a CairoUserDataKey
to attach the user data touser.data
CairoPattern
CairoStatus
] CAIRO_STATUS_SUCCESS
or CAIRO_STATUS_NO_MEMORY
if a
slot could not be allocated for the user data.