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projecten1/lib/python3.6/site-packages/PIL/ImageShow.py

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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.major >= 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)
+
+
+def show(image, title=None, **options):
+    r"""
+    Display a given image.
+
+    :param image: An image object.
+    :param title: Optional title.  Not all viewers can display the title.
+    :param \**options: Additional viewer options.
+    :returns: True if a suitable viewer was found, false otherwise.
+    """
+    for viewer in _viewers:
+        if viewer.show(image, title=title, **options):
+            return 1
+    return 0
+
+
+class Viewer(object):
+    """Base class for viewers."""
+
+    # 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" and image.mode != "RGBA":
+            image = image.convert(base)
+
+        return self.show_image(image, **options)
+
+    # hook methods
+
+    format = None
+    options = {}
+
+    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), **self.options)
+
+    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 = "PNG"
+        options = {'compress_level': 1}
+
+        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) and os.access(filename, os.X_OK):
+                return filename
+        return None
+
+    class UnixViewer(Viewer):
+        format = "PNG"
+        options = {'compress_level': 1}
+
+        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 EogViewer(UnixViewer):
+        def get_command_ex(self, file, **options):
+            command = executable = "eog"
+            return command, executable
+
+    if which("eog"):
+        register(EogViewer)
+
+    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__":
+
+    if len(sys.argv) < 2:
+        print("Syntax: python ImageShow.py imagefile [title]")
+        sys.exit()
+
+    print(show(Image.open(sys.argv[1]), *sys.argv[2:]))