File: arctica-greeter-check-hidpi

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arctica-greeter 0.99.1.4-1
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#!/usr/bin/python3
# -*- coding: utf-8 -*-

# Copyright (C) 2017 Clement Lefebvre <clement.lefebvre@linuxmint.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 3 as
# published by the Free Software Foundation.
#
# 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#
# Authors: Clement Lefebvre <clement.lefebvre@linuxmint.com>

import gi
gi.require_version('Gdk', '3.0')
from gi.repository import Gdk
import sys
import os

HIDPI_LIMIT = 192

def get_window_scale():
    window_scale = 1
    try:
        display = Gdk.Display.get_default()
        screen = display.get_default_screen()
        primary = screen.get_primary_monitor()

        rect = screen.get_monitor_geometry(primary)
        width_mm = screen.get_monitor_width_mm(primary)
        height_mm = screen.get_monitor_height_mm(primary)
        monitor_scale = screen.get_monitor_scale_factor(primary)

        # Return 1 if the screen size isn't available (some TVs report their aspect ratio instead ... 16/9 or 16/10)
        if ((width_mm == 160 and height_mm == 90) \
            or (width_mm == 160 and height_mm == 100) \
            or (width_mm == 16 and height_mm == 9) \
            or (width_mm == 16 and height_mm == 10)):
            return 1

        if rect.height * monitor_scale < 1500:
            return 1

        if width_mm > 0 and height_mm > 0:
            witdh_inch = width_mm / 25.4
            height_inch = height_mm / 25.4
            dpi_x = rect.width * monitor_scale / witdh_inch
            dpi_y = rect.height * monitor_scale / height_inch
            if dpi_x > HIDPI_LIMIT and dpi_y > HIDPI_LIMIT:
                window_scale = 2

    except Exception as detail:
        syslog.syslog("Error while detecting hidpi mode: %s" % detail)

    return window_scale

if __name__ == '__main__':
    window_scale = get_window_scale();
    print ("{script}: Window scale is {value}".format(script=os.path.basename(sys.argv[0]), value=window_scale), file=sys.stderr)
    print (window_scale, file=sys.stdout)
    sys.exit(0)