238 lines
6.2 KiB
Python
238 lines
6.2 KiB
Python
#
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# The Python Imaging Library.
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# $Id$
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#
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# im.show() drivers
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#
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# History:
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# 2008-04-06 fl Created
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#
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# Copyright (c) Secret Labs AB 2008.
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#
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# See the README file for information on usage and redistribution.
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#
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import os
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import shutil
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import subprocess
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import sys
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import tempfile
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from shlex import quote
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from PIL import Image
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_viewers = []
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def register(viewer, order=1):
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"""
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The :py:func:`register` function is used to register additional viewers.
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:param viewer: The viewer to be registered.
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:param order:
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Zero or a negative integer to prepend this viewer to the list,
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a positive integer to append it.
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"""
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try:
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if issubclass(viewer, Viewer):
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viewer = viewer()
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except TypeError:
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pass # raised if viewer wasn't a class
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if order > 0:
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_viewers.append(viewer)
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else:
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_viewers.insert(0, viewer)
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def show(image, title=None, **options):
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r"""
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Display a given image.
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:param image: An image object.
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:param title: Optional title. Not all viewers can display the title.
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:param \**options: Additional viewer options.
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:returns: ``True`` if a suitable viewer was found, ``False`` otherwise.
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"""
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for viewer in _viewers:
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if viewer.show(image, title=title, **options):
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return 1
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return 0
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class Viewer:
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"""Base class for viewers."""
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# main api
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def show(self, image, **options):
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"""
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The main function for displaying an image.
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Converts the given image to the target format and displays it.
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"""
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# save temporary image to disk
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if not (
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image.mode in ("1", "RGBA")
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or (self.format == "PNG" and image.mode in ("I;16", "LA"))
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):
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base = Image.getmodebase(image.mode)
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if image.mode != base:
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image = image.convert(base)
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return self.show_image(image, **options)
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# hook methods
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format = None
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"""The format to convert the image into."""
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options = {}
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"""Additional options used to convert the image."""
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def get_format(self, image):
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"""Return format name, or ``None`` to save as PGM/PPM."""
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return self.format
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def get_command(self, file, **options):
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"""
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Returns the command used to display the file.
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Not implemented in the base class.
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"""
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raise NotImplementedError
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def save_image(self, image):
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"""Save to temporary file and return filename."""
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return image._dump(format=self.get_format(image), **self.options)
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def show_image(self, image, **options):
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"""Display the given image."""
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return self.show_file(self.save_image(image), **options)
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def show_file(self, file, **options):
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"""Display the given file."""
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os.system(self.get_command(file, **options))
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return 1
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# --------------------------------------------------------------------
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class WindowsViewer(Viewer):
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"""The default viewer on Windows is the default system application for PNG files."""
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format = "PNG"
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options = {"compress_level": 1}
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def get_command(self, file, **options):
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return (
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'start "Pillow" /WAIT "%s" '
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"&& ping -n 2 127.0.0.1 >NUL "
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'&& del /f "%s"' % (file, file)
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)
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if sys.platform == "win32":
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register(WindowsViewer)
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class MacViewer(Viewer):
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"""The default viewer on MacOS using ``Preview.app``."""
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format = "PNG"
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options = {"compress_level": 1}
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def get_command(self, file, **options):
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# on darwin open returns immediately resulting in the temp
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# file removal while app is opening
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command = "open -a Preview.app"
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command = "({} {}; sleep 20; rm -f {})&".format(
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command, quote(file), quote(file)
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)
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return command
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def show_file(self, file, **options):
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"""Display given file"""
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fd, path = tempfile.mkstemp()
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with os.fdopen(fd, "w") as f:
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f.write(file)
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with open(path, "r") as f:
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subprocess.Popen(
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["im=$(cat); open -a Preview.app $im; sleep 20; rm -f $im"],
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shell=True,
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stdin=f,
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)
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os.remove(path)
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return 1
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if sys.platform == "darwin":
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register(MacViewer)
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class UnixViewer(Viewer):
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format = "PNG"
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options = {"compress_level": 1}
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def get_command(self, file, **options):
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command = self.get_command_ex(file, **options)[0]
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return "({} {}; rm -f {})&".format(command, quote(file), quote(file))
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def show_file(self, file, **options):
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"""Display given file"""
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fd, path = tempfile.mkstemp()
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with os.fdopen(fd, "w") as f:
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f.write(file)
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with open(path, "r") as f:
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command = self.get_command_ex(file, **options)[0]
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subprocess.Popen(
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["im=$(cat);" + command + " $im; rm -f $im"], shell=True, stdin=f
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)
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os.remove(path)
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return 1
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class DisplayViewer(UnixViewer):
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"""The ImageMagick ``display`` command."""
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def get_command_ex(self, file, **options):
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command = executable = "display"
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return command, executable
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class EogViewer(UnixViewer):
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"""The GNOME Image Viewer ``eog`` command."""
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def get_command_ex(self, file, **options):
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command = executable = "eog"
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return command, executable
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class XVViewer(UnixViewer):
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"""
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The X Viewer ``xv`` command.
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This viewer supports the ``title`` parameter.
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"""
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def get_command_ex(self, file, title=None, **options):
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# note: xv is pretty outdated. most modern systems have
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# imagemagick's display command instead.
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command = executable = "xv"
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if title:
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command += " -name %s" % quote(title)
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return command, executable
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if sys.platform not in ("win32", "darwin"): # unixoids
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if shutil.which("display"):
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register(DisplayViewer)
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if shutil.which("eog"):
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register(EogViewer)
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if shutil.which("xv"):
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register(XVViewer)
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if __name__ == "__main__":
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if len(sys.argv) < 2:
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print("Syntax: python ImageShow.py imagefile [title]")
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sys.exit()
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with Image.open(sys.argv[1]) as im:
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print(show(im, *sys.argv[2:]))
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