Added PyCUPS printer module based on PR #113 from @oelegeirnaert

Author: reuterbal

INSTALL.md

@@ -56,6 +56,7 @@ In a terminal, enter the following commands
 sudo apt install python3-dev python3-pip virtualenv  
 sudo apt install qt5-default pyqt5-dev pyqt5-dev-tools # for PyQt5-GUI
 sudo apt install gphoto2 libgphoto2-dev # to use gphoto2
+sudo apt install libcups2-dev # to use pycups
 ```
 
 If you want to use the gphoto2-cffi bindings you have to install the following packages:

photobooth/defaults.cfg

@@ -42,7 +42,7 @@ enable = True
 pdf = False
 # Ask for confirmation before printing
 confirmation = True
-# Printer module to use (PyQt5)
+# Printer module to use (PyQt5, PyCUPS)
 module = PyQt5
 # Paper width in mm
 width = 148

photobooth/printer/PrinterPyCups.py

@@ -0,0 +1,69 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+
+# Photobooth - a flexible photo booth software
+# Copyright (C) 2019  Balthasar Reuter <photobooth at re - web dot eu>
+#
+# This program is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Affero General Public License as published by
+# the Free Software Foundation, either version 3 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 Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program. If not, see <http://www.gnu.org/licenses/>.
+#
+# This class was contributed by
+# @oelegeirnaert (https://github.com/oelegeirnaert)
+# see https://github.com/reuterbal/photobooth/pull/113
+
+import logging
+import os
+
+try:
+    import cups
+except ImportError:
+    logging.error('pycups is not installed')
+    cups = None
+
+from PIL import ImageQt
+
+from . import Printer
+
+
+class PrinterPyCups(Printer):
+
+    def __init__(self, page_size, print_pdf=False):
+
+        self._conn = cups.Connection() if cups else None
+        self._counter = 0
+
+        if os.access('/dev/shm', os.W_OK):
+            logging.debug('Storing temp files to "/dev/shm/print.jpg"')
+            self._tmp_filename = '/dev/shm/print.jpg'
+        else:
+            logging.debug('Storing temp files to "/tmp/print.jpg"')
+            self._tmp_filename = '/tmp/print.jpg'
+
+        if self._conn is not None:
+            self._printer = self._conn.getDefault()
+
+            logging.info('Using printer "%s"', self._printer)
+
+        if print_pdf:
+            logging.error('Printing to PDF not supported with pycups')
+
+    def print(self, picture):
+
+        if isinstance(picture, ImageQt.ImageQt):
+            picture.save(self._tmp_filename)
+        else:
+            picture.save(self._tmp_filename, format='JPEG')
+
+        if self._conn is not None:
+            self._conn.printFile(self._printer, self._tmp_filename,
+                                 'photobooth %d' % self._counter, {})

photobooth/printer/PrinterPyQt5.py

@@ -53,7 +53,7 @@ def print(self, picture):
 
         logging.info('Printing picture')
 
-        picture = picture.scaled(self._printer.paperRect().size(),
+        picture = picture.scaled(self._printer.pageRect().size(),
                                  QtCore.Qt.KeepAspectRatio,
                                  QtCore.Qt.SmoothTransformation)
 

photobooth/printer/__init__.py

@@ -19,7 +19,8 @@
 
 # Available printer modules as tuples of (config name, module name, class name)
 modules = (
-    ('PyQt5', 'PrinterPyQt5', 'PrinterPyQt5'), )
+    ('PyQt5', 'PrinterPyQt5', 'PrinterPyQt5'),
+    ('PyCUPS', 'PrinterPyCups', 'PrinterPyCups'))
 
 
 class Printer:

setup.py

@@ -188,6 +188,7 @@ def get_mo_files(basedir, installdir):
         'Pillow',
         'gpiozero',
         'gphoto2',
+        'pycups'
         ],
 
     # List additional groups of dependencies here (e.g. development