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#
# The Python Imaging Library.
# $Id$
#
# im.show() drivers
#
# History:
# 2008-04-06 fl Created
#
# Copyright (c) Secret Labs AB 2008.
#
# See the README file for information on usage and redistribution.
#
from __future__ import print_function
from PIL import Image
import os
import sys
if sys.version_info >= (3, 3):
from shlex import quote
else:
from pipes import quote
_viewers = []
def register(viewer, order=1):
try:
if issubclass(viewer, Viewer):
viewer = viewer()
except TypeError:
pass # raised if viewer wasn't a class
if order > 0:
_viewers.append(viewer)
elif order < 0:
_viewers.insert(0, viewer)
##
# Displays a given image.
#
# @param image An image object.
# @param title Optional title. Not all viewers can display the title.
# @param **options Additional viewer options.
# @return True if a suitable viewer was found, false otherwise.
def show(image, title=None, **options):
for viewer in _viewers:
if viewer.show(image, title=title, **options):
return 1
return 0
##
# Base class for viewers.
class Viewer(object):
# main api
def show(self, image, **options):
# save temporary image to disk
if image.mode[:4] == "I;16":
# @PIL88 @PIL101
# "I;16" isn't an 'official' mode, but we still want to
# provide a simple way to show 16-bit images.
base = "L"
# FIXME: auto-contrast if max() > 255?
else:
base = Image.getmodebase(image.mode)
if base != image.mode and image.mode != "1":
image = image.convert(base)
return self.show_image(image, **options)
# hook methods
format = None
def get_format(self, image):
# return format name, or None to save as PGM/PPM
return self.format
def get_command(self, file, **options):
raise NotImplementedError
def save_image(self, image):
# save to temporary file, and return filename
return image._dump(format=self.get_format(image))
def show_image(self, image, **options):
# display given image
return self.show_file(self.save_image(image), **options)
def show_file(self, file, **options):
# display given file
os.system(self.get_command(file, **options))
return 1
# --------------------------------------------------------------------
if sys.platform == "win32":
class WindowsViewer(Viewer):
format = "BMP"
def get_command(self, file, **options):
return ('start "Pillow" /WAIT "%s" '
'&& ping -n 2 127.0.0.1 >NUL '
'&& del /f "%s"' % (file, file))
register(WindowsViewer)
elif sys.platform == "darwin":
class MacViewer(Viewer):
format = "BMP"
def get_command(self, file, **options):
# on darwin open returns immediately resulting in the temp
# file removal while app is opening
command = "open -a /Applications/Preview.app"
command = "(%s %s; sleep 20; rm -f %s)&" % (command, quote(file),
quote(file))
return command
register(MacViewer)
else:
# unixoids
def which(executable):
path = os.environ.get("PATH")
if not path:
return None
for dirname in path.split(os.pathsep):
filename = os.path.join(dirname, executable)
if os.path.isfile(filename):
# FIXME: make sure it's executable
return filename
return None
class UnixViewer(Viewer):
def show_file(self, file, **options):
command, executable = self.get_command_ex(file, **options)
command = "(%s %s; rm -f %s)&" % (command, quote(file),
quote(file))
os.system(command)
return 1
# implementations
class DisplayViewer(UnixViewer):
def get_command_ex(self, file, **options):
command = executable = "display"
return command, executable
if which("display"):
register(DisplayViewer)
class XVViewer(UnixViewer):
def get_command_ex(self, file, title=None, **options):
# note: xv is pretty outdated. most modern systems have
# imagemagick's display command instead.
command = executable = "xv"
if title:
command += " -name %s" % quote(title)
return command, executable
if which("xv"):
register(XVViewer)
if __name__ == "__main__":
# usage: python ImageShow.py imagefile [title]
print(show(Image.open(sys.argv[1]), *sys.argv[2:]))
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