Created attachment 100860 [details]
the pdf that pdftocairo can't render properly

In the attached pdf file, there is an area filled with grid-like pattern.
and pdftocairo -svg renders the area with many horizontal gaps. pdftoppm doesn't have this problem.

I build poppler from latest master 1b705331019b155f2138d4b9f5a5bd03ec59193d on ubuntu 14.04. configuration:

Building poppler with support for:
  font configuration: fontconfig
  splash output:      yes
  cairo output:       yes
  qt4 wrapper:        no
  qt5 wrapper:        no
  glib wrapper:       yes
    introspection:    no
  cpp wrapper:        yes
  use gtk-doc:        no
  use libjpeg:        yes
  use libpng:         yes
  use libtiff:        yes
  use zlib:           no
  use libcurl:        no
  use libopenjpeg:    yes
  use cms:            yes
      with lcms2
  command line utils: yes