set menu font size according to screen dpi

frontend/document/koptinterface.lua

@@ -99,7 +99,7 @@ KoptOptions = {
 				name_text = "Contrast",
 				name_align_right = 0.2,
 				item_text = {"lightest", "lighter", "default", "darker", "darkest"},
-				item_font_size = math.floor(18*Screen:getWidth()/600),
+				item_font_size = math.floor(18*Screen:getDPI()/167),
 				item_align_center = 0.8,
 				values = {2.0, 1.5, 1.0, 0.5, 0.2},
 				default_value = 1.0,

frontend/document/pdfdocument.lua

@@ -1,7 +1,6 @@
 require "cache"
 require "ui/geometry"
 require "ui/screen"
-require "ui/device"
 require "ui/reader/readerconfig"
 require "document/koptinterface"
 
@@ -11,7 +10,7 @@ PdfDocument = Document:new{
 	mupdf_cache_size = 5 * 1024 * 1024,
 	dc_null = DrawContext.new(),
 	screen_size = Screen:getSize(),
-	screen_dpi = Device:getModel() == "KindlePaperWhite" and 212 or 167,
+	screen_dpi = Screen:getDPI(),
 	options = KoptOptions,
 	configurable = Configurable,
 	koptinterface = KoptInterface,

frontend/ui/config.lua

@@ -129,7 +129,7 @@ function ToggleSwitch:init()
 	self.position = nil
 	
 	local label_font_face = "cfont"
-	local label_font_size = math.floor(20*Screen:getWidth()/600)
+	local label_font_size = math.floor(16*Screen:getDPI()/167)
 	
 	self.toggle_frame = FrameContainer:new{background = 0, color = 7, radius = 7, bordersize = 1, padding = 2,}
 	self.toggle_content = HorizontalGroup:new{}
@@ -260,18 +260,19 @@ end
 
 ConfigOption = CenterContainer:new{}
 function ConfigOption:init()
-	local default_name_font_size = math.floor(20*Screen:getWidth()/600)
-	local default_item_font_size = math.floor(20*Screen:getWidth()/600)
-	local default_items_spacing = math.floor(30*Screen:getWidth()/600)
-	local default_option_height = math.floor(50*Screen:getWidth()/600)
-	local default_option_padding = math.floor(30*Screen:getWidth()/600)
+	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(30*mag_ratio)
 	local vertical_group = VerticalGroup:new{}
 	table.insert(vertical_group, VerticalSpan:new{ width = default_option_padding })
 	for c = 1, #self.options do
 		if self.options[c].show ~= false then
 			local name_align = self.options[c].name_align_right and self.options[c].name_align_right or 0.33
 			local item_align = self.options[c].item_align_center and self.options[c].item_align_center or 0.66
-			local name_font_face = self.options[c].name_font_face and self.options[c].name_font_face or "tfont"
+			local name_font_face = self.options[c].name_font_face and self.options[c].name_font_face or "cfont"
 			local name_font_size = self.options[c].name_font_size and self.options[c].name_font_size or default_name_font_size
 			local item_font_face = self.options[c].item_font_face and self.options[c].item_font_face or "cfont"
 			local item_font_size = self.options[c].item_font_size and self.options[c].item_font_size or default_item_font_size

frontend/ui/menu.lua

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

frontend/ui/screen.lua

@@ -84,6 +84,10 @@ function Screen:getHeight()
 	return h
 end
 
+function Screen:getDPI()
+	return Device:getModel() == "KindlePaperWhite" and 212 or 167
+end
+
 function Screen:getPitch()
 	return self.fb:getPitch()
 end