hide DPI dependency in Font module

frontend/document/koptinterface.lua

@@ -109,7 +109,7 @@ KoptOptions = {
 				name_text = "Contrast",
 				name_align_right = 0.2,
 				item_text = {"lightest", "lighter", "default", "darker", "darkest"},
-				item_font_size = math.floor(18*Screen:getDPI()/167),
+				item_font_size = 18,
 				item_align_center = 0.8,
 				values = {2.0, 1.5, 1.0, 0.5, 0.2},
 				default_value = 1.0,

frontend/ui/config.lua

@@ -171,7 +171,7 @@ function ToggleSwitch:init()
 	self.position = nil
 	
 	local label_font_face = "cfont"
-	local label_font_size = math.floor(16*Screen:getDPI()/167)
+	local label_font_size = 16
 	
 	self.toggle_frame = FrameContainer:new{background = 0, color = 7, radius = 7, bordersize = 1, padding = 2,}
 	self.toggle_content = HorizontalGroup:new{}
@@ -302,12 +302,11 @@ end
 
 ConfigOption = CenterContainer:new{}
 function ConfigOption:init()
-	local mag_ratio = Screen:getDPI()/167
-	local default_name_font_size = math.floor(20*mag_ratio)
-	local default_item_font_size = math.floor(16*mag_ratio)
-	local default_items_spacing = math.floor(30*mag_ratio)
-	local default_option_height = math.floor(50*mag_ratio)
-	local default_option_padding = math.floor(15*mag_ratio)
+	local default_name_font_size = 20
+	local default_item_font_size = 16
+	local default_items_spacing = 30
+	local default_option_height = 50
+	local default_option_padding = 15
 	local vertical_group = VerticalGroup:new{}
 	table.insert(vertical_group, VerticalSpan:new{ width = default_option_padding })
 	for c = 1, #self.options do

frontend/ui/font.lua

@@ -43,6 +43,8 @@ function Font:getFace(font, size)
 		-- default to content font
 		font = self.cfont
 	end
+	
+	local size = math.floor(size*Screen:getDPI()/167)
 
 	local face = self.faces[font..size]
 	-- build face if not found

frontend/ui/menu.lua

@@ -195,13 +195,13 @@ Widget that displays menu
 --]]
 Menu = FocusManager:new{
 	-- face for displaying item contents
-	cface = Font:getFace("cfont", math.floor(22*Screen:getDPI()/167)),
+	cface = Font:getFace("cfont", 22),
 	-- face for menu title
-	tface = Font:getFace("tfont", math.floor(25*Screen:getDPI()/167)),
+	tface = Font:getFace("tfont", 25),
 	-- face for paging info display
-	fface = Font:getFace("ffont", math.floor(16*Screen:getDPI()/167)),
+	fface = Font:getFace("ffont", 16),
 	-- font for item shortcut
-	sface = Font:getFace("scfont", math.floor(20*Screen:getDPI()/167)),
+	sface = Font:getFace("scfont", 20),
 
 	title = "No Title",
 	-- default width and height