# cairo.py
#
# Copyright (C) 2011 Carlos Garcia Campos <carlosgc@gnome.org>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
from __future__ import absolute_import, division, print_function

from backends import Backend, register_backend
import subprocess
import os

class Cairo(Backend):

    def __init__(self, name):
        Backend.__init__(self, name, '.diff.png')
        self._pdftocairo = os.path.join(self._utilsdir, 'pdftocairo');

    def create_refs(self, doc_path, refs_path, password = None):
        out_path = os.path.join(refs_path, 'cairo')
        cmd = [self._pdftocairo, '-cropbox', '-r', '72', '-png', doc_path, out_path]
        if password is not None:
            cmd.extend(['-opw', password, '-upw', password])
        p = subprocess.Popen(cmd, stderr = subprocess.PIPE)
        return self._check_exit_status(p, out_path)

    def _create_diff(self, ref_path, result_path):
        self._diff_png(ref_path, result_path)

register_backend('cairo', Cairo)