1 files changed, 93 insertions, 0 deletions
diff --git a/Xamarin.Forms.Platform.Android/Renderers/FontExtensions.cs b/Xamarin.Forms.Platform.Android/Renderers/FontExtensions.cs
new file mode 100644
index 00000000..da458642
--- /dev/null
+++ b/Xamarin.Forms.Platform.Android/Renderers/FontExtensions.cs
@@ -0,0 +1,93 @@
+using System;
+using System.Collections.Generic;
+using Android.Graphics;
+
+namespace Xamarin.Forms.Platform.Android
+{
+	public static class FontExtensions
+	{
+		static readonly Dictionary<Tuple<string, FontAttributes>, Typeface> Typefaces = new Dictionary<Tuple<string, FontAttributes>, Typeface>();
+
+		static Typeface s_defaultTypeface;
+
+		public static float ToScaledPixel(this Font self)
+		{
+			if (self.IsDefault)
+				return 14;
+
+			if (self.UseNamedSize)
+			{
+				switch (self.NamedSize)
+				{
+					case NamedSize.Micro:
+						return 10;
+					case NamedSize.Small:
+						return 12;
+					case NamedSize.Default:
+					case NamedSize.Medium:
+						return 14;
+					case NamedSize.Large:
+						return 18;
+				}
+			}
+
+			return (float)self.FontSize;
+		}
+
+		public static Typeface ToTypeface(this Font self)
+		{
+			if (self.IsDefault)
+				return s_defaultTypeface ?? (s_defaultTypeface = Typeface.Default);
+
+			var key = new Tuple<string, FontAttributes>(self.FontFamily, self.FontAttributes);
+			Typeface result;
+			if (Typefaces.TryGetValue(key, out result))
+				return result;
+
+			var style = TypefaceStyle.Normal;
+			if ((self.FontAttributes & (FontAttributes.Bold | FontAttributes.Italic)) == (FontAttributes.Bold | FontAttributes.Italic))
+				style = TypefaceStyle.BoldItalic;
+			else if ((self.FontAttributes & FontAttributes.Bold) != 0)
+				style = TypefaceStyle.Bold;
+			else if ((self.FontAttributes & FontAttributes.Italic) != 0)
+				style = TypefaceStyle.Italic;
+
+			if (self.FontFamily != null)
+				result = Typeface.Create(self.FontFamily, style);
+			else
+				result = Typeface.Create(Typeface.Default, style);
+
+			Typefaces[key] = result;
+			return result;
+		}
+
+		internal static bool IsDefault(this IFontElement self)
+		{
+			return self.FontFamily == null && self.FontSize == Device.GetNamedSize(NamedSize.Default, typeof(Label), true) && self.FontAttributes == FontAttributes.None;
+		}
+
+		internal static Typeface ToTypeface(this IFontElement self)
+		{
+			var key = new Tuple<string, FontAttributes>(self.FontFamily, self.FontAttributes);
+			Typeface result;
+			if (Typefaces.TryGetValue(key, out result))
+				return result;
+
+			var style = TypefaceStyle.Normal;
+			if ((self.FontAttributes & (FontAttributes.Bold | FontAttributes.Italic)) == (FontAttributes.Bold | FontAttributes.Italic))
+				style = TypefaceStyle.BoldItalic;
+			else if ((self.FontAttributes & FontAttributes.Bold) != 0)
+				style = TypefaceStyle.Bold;
+			else if ((self.FontAttributes & FontAttributes.Italic) != 0)
+				style = TypefaceStyle.Italic;
+
+			if (self.FontFamily != null)
+				result = Typeface.Create(self.FontFamily, style);
+			else
+				result = Typeface.Create(Typeface.Default, style);
+
+			Typefaces[key] = result;
+			return result;
+		}
+	}
+}
+\ No newline at end of file