#5 assert against pdfbox positions and fix by implementing subroutines

src/UglyToad.PdfPig/Fonts/Type1/CharStrings/Commands/Arithmetic/CallSubrCommand.cs

@@ -18,6 +18,14 @@
         public static void Run(Type1BuildCharContext context)
         {
             var index = (int)context.Stack.PopTop();
+
+            var subroutine = context.Subroutines[index];
+
+            foreach (var command in subroutine.Commands)
+            {
+                command.Match(x => context.Stack.Push(x),
+                    x => x.Run(context));
+            }
         }
     }
 }

src/UglyToad.PdfPig/Fonts/Type1/CharStrings/Commands/Type1BuildCharContext.cs

@@ -5,6 +5,8 @@
 
     internal class Type1BuildCharContext
     {
+        public IReadOnlyDictionary<int, Type1CharStrings.CommandSequence> Subroutines { get; }
+
         public decimal WidthX { get; set; }
 
         public decimal WidthY { get; set; }
@@ -25,6 +27,11 @@
 
         public IReadOnlyList<PdfPoint> FlexPoints { get; }
 
+        public Type1BuildCharContext(IReadOnlyDictionary<int, Type1CharStrings.CommandSequence> subroutines)
+        {
+            Subroutines = subroutines;
+        }
+
         public void AddFlexPoint(PdfPoint point)
         {
 

src/UglyToad.PdfPig/Fonts/Type1/CharStrings/Type1CharStrings.cs

@@ -44,9 +44,9 @@
             return glyph;
         }
 
-        private static CharacterPath Run(CommandSequence sequence)
+        private CharacterPath Run(CommandSequence sequence)
         {
-            var context = new Type1BuildCharContext();
+            var context = new Type1BuildCharContext(Subroutines);
             foreach (var command in sequence.Commands)
             {
                 command.Match(x => context.Stack.Push(x),