tweak font scaling based on dpi

2 files changed, 16 insertions, 1 deletions

diff --git a/TurtleArt/tautils.py b/TurtleArt/tautils.py
index 1d125a3..47f665f 100644
--- a/TurtleArt/tautils.py
+++ b/TurtleArt/tautils.py
@@ -687,3 +687,10 @@ def _get_dmi(node):
         return open(path).readline().strip()
     except:
         return None
+
+
+def get_screen_dpi():
+    xft_dpi = Gtk.Settings.get_default().get_property('gtk-xft-dpi')
+    dpi = float(xft_dpi / 1024)
+    logging.error('Setting dpi to: %f', dpi)
+    return dpi
diff --git a/TurtleArt/tawindow.py b/TurtleArt/tawindow.py
index 84ae344..7d6db60 100644
--- a/TurtleArt/tawindow.py
+++ b/TurtleArt/tawindow.py
@@ -31,6 +31,7 @@ from gi.repository import Gtk
 from gi.repository import Gdk
 from gi.repository import GObject
 from gi.repository import GdkPixbuf
+from gi.repository import PangoCairo
 from gettext import gettext as _
 
 import os
@@ -157,7 +158,7 @@ class TurtleArtWindow():
         self.hw = get_hardware()
         self.lead = 1.0
         if self.hw in (XO1, XO15, XO175):
-            self.scale = 1.2  # slight scale-up of fonts on XO
+            self.scale = 133. / 200  # Tweak scale of fonts on XO
             if self.hw == XO1:
                 self.color_mode = '565'
             else:
@@ -166,6 +167,8 @@ class TurtleArtWindow():
             self.scale = 1.0
             self.color_mode = '888'  # TODO: Read visual mode from gtk image
 
+        self._set_screen_dpi()
+
         self.block_scale = BLOCK_SCALE[3]
         self.trash_scale = 0.5
         self.myblock = {}
@@ -282,6 +285,11 @@ class TurtleArtWindow():
         self.block_operation = ''
         self.window_init_complete = True
 
+    def _set_screen_dpi(self):
+        dpi = _get_screen_dpi()
+        font_map_default = PangoCairo.font_map_get_default()
+        font_map_default.set_resolution(dpi)
+
     def _get_plugin_home(self):
         ''' Look in the execution directory '''
         path = os.path.join(self.path, self._PLUGIN_SUBPATH)