def _run_ghostscript( args ) :
"""Run Ghostscript.
We have to do a bit of stuffing around to stop Ghostscript from printing warnings to the console.
This code was adapted from ghostscript's _gsprint.py.
"""
# allocate a new Ghostscript instance
# NOTE: We only import the ghostscript stuff if it's needed (i.e. when we get here), so that people
# can run this program without needing Ghostscript to be installed, if they already have a database.
import ghostscript
import ghostscript._gsprint as gsp
inst = gsp.new_instance()
# wrap stdin/stdout/stderr with dummy buffers
def wrap( stdin ) :
return gsp.c_stdstream_call_t(
lambda inst,buf,count: 0 if stdin else count
)
stdin_buf = wrap( True )
stdout_buf = wrap( False )
stderr_buf = wrap( False )
gsp.set_stdio( inst , stdin_buf , stdout_buf , stderr_buf )
try :
# run Ghostscript
args = [ s.encode(locale.getpreferredencoding()) for s in args ]
__Ghostscript = getattr( ghostscript , "__Ghostscript" )
__Ghostscript( inst , args )
finally :
# clean up
gsp.delete_instance( inst )
del inst
def main(argv):
code = 1
use_gui, _ = Gtk.init_check(argv)
# insert display device parameters as first arguments
# this controls the format of the pixbuf that ghostscript will deliver
# see display_sync for details
# fast
CAIRO_FORMAT_RGB24 = gs.DISPLAY_COLORS_RGB | gs.DISPLAY_UNUSED_LAST | \
gs.DISPLAY_DEPTH_8 | gs.DISPLAY_LITTLEENDIAN
# interesting
SEPARATION_FORMAT = gs.DISPLAY_COLORS_SEPARATION | gs.DISPLAY_ALPHA_NONE | \
gs.DISPLAY_DEPTH_8 | gs.DISPLAY_BIGENDIAN
# if there are spot colors they are mixed into the cmyk values
CMYK_FORMAT = gs.DISPLAY_COLORS_CMYK | gs.DISPLAY_ALPHA_NONE | \
gs.DISPLAY_DEPTH_8 | gs.DISPLAY_BIGENDIAN
dformat = "-dDisplayFormat=%d" % \
( CAIRO_FORMAT_RGB24 | gs.DISPLAY_TOPFIRST )
nargv = [argv[0], dformat] + argv[1:]
#run Ghostscript
try:
instance = gs.new_instance()
gs.set_stdio(instance, gsdll_stdin, gsdll_stdout, gsdll_stderr)
if use_gui:
gs.set_display_callback(instance, c.byref(display))
code = gs.init_with_args(instance, nargv)
if code == 0:
code = gs.run_string(instance, start_string)
code1 = gs.exit(instance)
if code == 0 or code == gs.e_Quit:
code = code1
if code == gs.e_Quit:
code = 0 # user executed 'quit'
gs.delete_instance(instance)
except gs.GhostscriptError as e:
code = e.code
sys.stderr.write(e.message)
finally:
exit_status = 0;
if code in [0, gs.e_Info, gs.e_Quit]:
pass
elif code == gs.e_Fatal:
exit_status = 1
else:
exit_status = 255
return exit_status
__author__ = "Hartmut Goebel <*****@*****.**>"
__copyright__ = "Copyright 2010 by Hartmut Goebel <*****@*****.**>"
__licence__ = "GNU General Public License version 3 (GPL v3)"
__credits__ = "Based on an example from http://www.ghostscript.com/doc/8.63/API.htm"
import sys
from ghostscript import _gsprint as gs
command = "1 2 add == flush\n"
instance = gs.new_instance()
# set_stdio() is not yet implemented
#gs.set_stdio(isntance, gsdll_stdin, gsdll_stdout, gsdll_stderr)
code = gs.init_with_args(instance, sys.argv)
if code == 0:
gs.run_string_begin(instance)
gs.run_string_continue(instance, command)
gs.run_string_continue(instance, "qu")
gs.run_string_continue(instance, "it")
gs.run_string_end(instance)
code1 = gs.exit(instance)
if code == 0 or code == gs.e_Quit:
code = code1
gs.delete_instance(instance)
if not (code == 0 or code == gs.e_Quit):
sys.exit(1)
__author__ = "Hartmut Goebel <*****@*****.**>"
__copyright__ = "Copyright 2010 by Hartmut Goebel <*****@*****.**>"
__licence__ = "GNU General Public License version 3 (GPL v3)"
__credits__ = "Based on an example from http://www.ghostscript.com/doc/8.63/API.htm"
import sys
from ghostscript import _gsprint as gs
command = "1 2 add == flush\n"
instance = gs.new_instance()
# set_stdio() is not yet implemented
#gs.set_stdio(isntance, gsdll_stdin, gsdll_stdout, gsdll_stderr)
code = gs.init_with_args(instance, sys.argv)
if code == 0:
gs.run_string_begin(instance);
gs.run_string_continue(instance, command);
gs.run_string_continue(instance, "qu");
gs.run_string_continue(instance, "it");
gs.run_string_end(instance);
code1 = gs.exit(instance)
if code == 0 or code == gs.e_Quit:
code = code1
gs.delete_instance(instance)
if not (code == 0 or code == gs.e_Quit):
sys.exit(1)
def cleanup(self):
""" Purge the ghostscript instance """
gs.delete_instance(self.instance)
self.instance = None
