test cairo errors in mapnik

gistfile1.py

#!/usr/bin/env python
import mapnik
import mapnik.printing
import cairo


m = mapnik.Map(600,300)
m.background = mapnik.Color('steelblue')

ds = mapnik.MemoryDatasource()
f = mapnik.Feature(mapnik.Context(), 1)
f.add_geometries_from_wkt("POINT(0 0)")
f.add_geometries_from_wkt("POINT(1 1)")
f.add_geometries_from_wkt("POINT(2 2)")
ds.add_feature(f)



s = mapnik.Style()
r = mapnik.Rule()
sym = mapnik.PointSymbolizer()
r.symbols.append(sym)
s.rules.append(r)
m.append_style('My Style',s)
layer = mapnik.Layer('points')
layer.datasource = ds
layer.styles.append('My Style')
m.layers.append(layer)
m.zoom_all()

page = mapnik.printing.PDFPrinter(
    pagesize=mapnik.printing.pagesizes['a4'],
    is_latlon=True,
    resolution=300,
    scale=mapnik.printing.any_scale,
    box=mapnik.Box2d(-1, -1, 3, 3),
    centering=mapnik.printing.centering.both
)
page.render_map(m, "output.pdf")



# Traceback (most recent call last):
#   File "./mapnik_pdf_test.py", line 39, in <module>
#     page.render_map(m, "output.pdf")
#   File "/usr/lib/pymodules/python2.6/mapnik/printing.py", line 613, in render_map
#     render_map()
#   File "/usr/lib/pymodules/python2.6/mapnik/printing.py", line 610, in render_map
#     ctx.restore()
# cairo.Error: Context.restore without matching Context.save
# python: /build/buildd/cairo-1.8.10/src/cairo.c:218: cairo_destroy: Assertion `((*&(&cr->ref_count)->ref_count) > 0)' failed.
# Aborted