add inkscape document. fix bug with truetype width where no font program present

src/UglyToad.PdfPig.Tests/Integration/VisualVerification/GenerateLetterBoundingBoxImages.cs

@@ -11,6 +11,7 @@
         private const string SingleGoogleDrivePage = "Single Page Simple - from google drive";
         private const string SinglePageFormattedType0Content = "Type0 Font";
         private const string SinglePageType1Content = "ICML03-081";
+        private const string SingleInkscapePage = "Single Page Simple - from inkscape";
 
         private static string GetFilename(string name)
         {
@@ -30,6 +31,12 @@
             Run(SinglePageType1Content);
         }
 
+        [Fact]
+        public void SinglePageSimpleFromInkscape()
+        {
+            Run(SingleInkscapePage);
+        }
+
         [Fact]
         public void SinglePageNonLatinFromAcrobatDistiller()
         {

src/UglyToad.PdfPig/Fonts/Simple/TrueTypeSimpleFont.cs

@@ -110,7 +110,7 @@
             if (font == null)
             {
                 fromFont = false;
-                 width = widths[characterCode];
+                 width = widths[characterCode - firstCharacter];
             }
             else
             {