356 lines
14 KiB
Python
356 lines
14 KiB
Python
#!/usr/bin/python3
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# -*- Mode: Python; coding: utf-8; indent-tabs-mode: nil; tab-width: 4 -*-
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# Mugshot - Lightweight user configuration utility
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# Copyright (C) 2013-2014 Sean Davis <smd.seandavis@gmail.com>
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#
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# Portions of this file are adapted from web_cam_box,
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# Copyright (C) 2010 Rick Spencer <rick.spencer@canonical.com>
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#
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# This program is free software: you can redistribute it and/or modify it
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# under the terms of the GNU General Public License version 3, as published
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# by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranties of
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# MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
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# PURPOSE. See the GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program. If not, see <http://www.gnu.org/licenses/>.
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from locale import gettext as _
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import logging
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logger = logging.getLogger('mugshot')
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from gi.repository import Gtk, GObject, Gst, GdkPixbuf
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from gi.repository import GdkX11, GstVideo # lint:ok
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import cairo
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import tempfile
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import os
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from mugshot_lib.CameraDialog import CameraDialog
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def draw_message(widget, message, ctx):
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"""Draw a message (including newlines) vertically centered on a cairo
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context."""
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split_msg = message.split('\n')
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# Get the height and width of the drawing area.
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alloc = widget.get_allocation()
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height = alloc.height
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# Make the background black.
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ctx.set_source_rgb(0, 0, 0)
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ctx.paint()
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# Set the font details.
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font_size = 20
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font_color = (255, 255, 255)
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font_name = "Sans"
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row_spacing = 6
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left_spacing = 10
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# Get start position
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message_height = (len(split_msg) * font_size) + len(split_msg) - 15
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current_pos = (height - message_height) / 2
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# Draw the message to the drawing area.
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ctx.set_source_rgb(*font_color)
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ctx.select_font_face(font_name, cairo.FONT_SLANT_NORMAL,
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cairo.FONT_WEIGHT_NORMAL)
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ctx.set_font_size(font_size)
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for line in split_msg:
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ctx.move_to(left_spacing, current_pos)
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ctx.show_text(line)
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current_pos = current_pos + font_size + row_spacing
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class CameraMugshotDialog(CameraDialog):
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"""Camera Capturing Dialog"""
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__gtype_name__ = "CameraMugshotDialog"
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def finish_initializing(self, builder): # pylint: disable=E1002
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"""Set up the camera dialog"""
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super(CameraMugshotDialog, self).finish_initializing(builder)
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# Initialize Gst or nothing will work.
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Gst.init(None)
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# Pack the video widget into the dialog.
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vbox = builder.get_object('camera_box')
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self.video_window = Gtk.DrawingArea()
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self.video_window.connect("realize", self.__on_video_window_realized)
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vbox.pack_start(self.video_window, True, True, 0)
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self.video_window.show()
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# Prepare the camerabin element.
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self.camerabin = Gst.ElementFactory.make("camerabin", "camera-source")
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if self.camerabin:
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bus = self.camerabin.get_bus()
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bus.add_signal_watch()
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bus.enable_sync_message_emission()
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bus.connect("message", self._on_message)
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bus.connect("sync-message::element", self._on_sync_message)
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self.realized = False
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self.draw_handler = self.video_window.connect('draw', self.on_draw)
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# If the camera fails to load, show an error on the screen.
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else:
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devices = []
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for device in os.listdir('/dev/'):
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if device.startswith('video'):
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devices.append(device)
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logger.error(_('Camera failed to load. Devices: %s') %
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'; '.join(devices))
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self.draw_handler = self.video_window.connect('draw',
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self.on_failed_draw)
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self.realized = True
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# Essential widgets
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self.record_button = builder.get_object('camera_record')
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self.apply_button = builder.get_object('camera_apply')
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# Store the temporary filename to be used.
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self.filename = None
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self.show_all()
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def on_failed_draw(self, widget, ctx):
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"""Display a message that the camera failed to load."""
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# Translators: Please include newlines, as required to fit the message.
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message = _("Sorry, but your camera\nfailed to initialize.")
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draw_message(widget, message, ctx)
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def on_draw(self, widget, ctx):
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"""Display a message that the camera is initializing on first draw.
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Afterwards, blank the drawing area to clear the message."""
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# Translators: Please include newlines, as required to fit the message.
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message = _("Please wait while your\ncamera is initialized.")
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draw_message(widget, message, ctx)
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# Redefine on_draw to blank the drawing area next time.
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def on_draw(self, widget, ctx):
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"""Redefinition of on_draw to blank the drawing area next time."""
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ctx.set_source_rgb(0, 0, 0)
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ctx.paint()
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# Redefine on_draw once more to do nothing else.
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def on_draw(self, widget, ctx):
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"""Redefinition of on_draw no longer do anything."""
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pass
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def play(self):
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"""Start the camera streaming and display the output. It is necessary
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to start the camera playing before using most other functions."""
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if not self.realized:
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self._set_video_window_id()
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if not self.realized:
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logger.error(_("Cannot display camera output."
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"Ignoring play command"))
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else:
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if self.camerabin:
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self.camerabin.set_state(Gst.State.PLAYING)
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def pause(self):
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"""Pause the camera output. It will cause the image to "freeze".
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Use play() to start the camera playing again. Note that calling pause
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before play may cause errors on certain camera."""
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if self.camerabin:
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self.camerabin.set_state(Gst.State.PAUSED)
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def take_picture(self, filename):
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"""take_picture - grab a frame from the webcam and save it to
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'filename.
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If play is not called before take_picture,
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an error may occur. If take_picture is called immediately after play,
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the camera may not be fully initialized, and an error may occur.
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Connect to the signal "image-captured" to be alerted when the picture
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is saved."""
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self.camerabin.set_property("location", filename)
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self.camerabin.emit("start-capture")
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def stop(self):
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"""Stop the camera streaming and display the output."""
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self.camerabin.set_state(Gst.State.NULL)
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def _on_message(self, bus, message):
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"""Internal signal handler for bus messages.
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May be useful to extend in a base class to handle messages
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produced from custom behaviors.
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arguments -
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bus: the bus from which the message was sent, typically self.bux
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message: the message sent"""
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# Ignore if there is no message.
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if message is None:
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return
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# Get the message type.
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t = message.type
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# Initial load, wait until camera is ready before enabling capture.
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if t == Gst.MessageType.ASYNC_DONE:
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self.record_button.set_sensitive(True)
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if t == Gst.MessageType.ELEMENT:
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# Keep the camera working after several pictures are taken.
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if message.get_structure().get_name() == "image-captured":
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self.camerabin.set_state(Gst.Sate.NULL)
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self.camerabin.set_state(Gst.State.PLAYING)
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self.emit("image-captured", self.filename)
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# Enable interface elements once the images are finished saving.
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elif message.get_structure().get_name() == "image-done":
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self.apply_button.set_sensitive(True)
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self.record_button.set_sensitive(True)
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self.pause()
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# Stop the stream if the EOS (end of stream) message is received.
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if t == Gst.MessageType.EOS:
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self.camerabin.set_state(Gst.State.NULL)
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# Capture and report any error received.
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elif t == Gst.MessageType.ERROR:
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err, debug = message.parse_error()
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logger.error("%s" % err, debug)
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def _on_sync_message(self, bus, message):
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""" _on_sync_message - internal signal handler for bus messages.
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May be useful to extend in a base class to handle messages
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produced from custom behaviors.
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arguments -
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bus: the bus from which the message was sent, typically self.bux
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message: the message sent
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"""
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# Ignore empty messages.
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if message.get_structure() is None:
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return
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message_name = message.get_structure().get_name()
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# Embed the gstreamer element into our window.
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if message_name == "prepare-window-handle":
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imagesink = message.src
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imagesink.set_property("force-aspect-ratio", True)
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imagesink.set_window_handle(
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self.video_window.get_window().get_xid())
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def __on_video_window_realized(self, widget, data=None):
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"""Internal signal handler, used to set up the xid for the drawing area
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in a thread safe manner. Do not call directly."""
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self._set_video_window_id()
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def _set_video_window_id(self):
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"""Set the window ID only if not previously configured."""
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if not self.realized and self.video_window.get_window() is not None:
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self.video_window.get_window().get_xid()
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self.realized = True
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def on_camera_record_clicked(self, widget):
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"""When the camera record/retry button is clicked:
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Record: Pause the video, start the capture, enable apply and retry.
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Retry: Restart the video stream."""
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# Remove any previous temporary file.
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if self.filename and os.path.isfile(self.filename):
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os.remove(self.filename)
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# Retry action.
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if self.apply_button.get_sensitive():
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self.record_button.set_label(Gtk.STOCK_MEDIA_RECORD)
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self.apply_button.set_sensitive(False)
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self.play()
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# Record (Capture) action.
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else:
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# Create a new temporary file.
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tmpfile = tempfile.NamedTemporaryFile(delete=False)
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tmpfile.close()
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self.filename = tmpfile.name
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# Capture the current image.
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self.take_picture(self.filename)
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# Set the record button to retry, and disable it until the capture
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# finishes.
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self.record_button.set_label(_("Retry"))
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self.record_button.set_sensitive(False)
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def on_camera_apply_clicked(self, widget):
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"""When the camera Apply button is clicked, crop the current photo and
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emit a signal to let the main application know there is a new file
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available. Then close the camera dialog."""
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self.center_crop(self.filename)
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self.emit("apply", self.filename)
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self.hide()
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def on_camera_cancel_clicked(self, widget):
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"""When the Cancel button is clicked, just hide the dialog."""
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self.hide()
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def on_camera_mugshot_dialog_destroy(self, widget, data=None):
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"""When the application exits, remove the current temporary file and
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stop the gstreamer element."""
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# Clear away the temp file.
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if self.filename and os.path.isfile(self.filename):
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os.remove(self.filename)
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# Clean up the camera before exiting
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self.camerabin.set_state(Gst.State.NULL)
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def on_camera_mugshot_dialog_hide(self, widget, data=None):
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"""When the dialog is hidden, pause the camera recording."""
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self.pause()
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def on_camera_mugshot_dialog_show(self, widget, data=None):
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"""When the dialog is shown, set the record button to record, disable
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the apply button, and start the camera."""
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self.record_button.set_label(Gtk.STOCK_MEDIA_RECORD)
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self.apply_button.set_sensitive(False)
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self.show_all()
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self.play()
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def center_crop(self, filename):
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"""Crop the specified file to square dimensions."""
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# Load the image into a Pixbuf.
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pixbuf = GdkPixbuf.Pixbuf.new_from_file(filename)
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# Get the image dimensions.
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height = pixbuf.get_height()
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width = pixbuf.get_width()
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start_x = 0
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start_y = 0
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# Calculate a balanced center.
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if width > height:
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start_x = (width - height) / 2
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width = height
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else:
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start_y = (height - width) / 2
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height = width
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# Create a new cropped pixbuf.
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new_pixbuf = pixbuf.new_subpixbuf(start_x, start_y, width, height)
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# Overwrite the temporary file with our new cropped image.
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new_pixbuf.savev(filename, "png", [], [])
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def on_camera_mugshot_dialog_delete_event(self, widget, data=None):
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"""Override the dialog delete event to just hide the window."""
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self.hide()
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return True
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# Signals used by CameraMugshotDialog:
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# image-captured: emitted when the camera is done capturing an image.
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# apply: emitted when the apply button has been pressed and there is a
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# new file saved for use.
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__gsignals__ = {'image-captured': (GObject.SIGNAL_RUN_LAST,
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GObject.TYPE_NONE,
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(GObject.TYPE_PYOBJECT,)),
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'apply': (GObject.SIGNAL_RUN_LAST, GObject.TYPE_NONE,
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(GObject.TYPE_STRING,))
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}
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