Silverlight WriteableBitmap not converting custom font correctly

Silverlight WriteableBitmap not converting custom font correctly

We use custom fonts to represent road signs and shapes that we plot on a graph.

Initially I plotted everything to a canvas, which worked fine, but was slow to scroll horizontally.

Then I fixed the scrolling issue by converting the canvas to a image using the WriteableBitmap, like this:

#if SILVERLIGHT     ImageSource ConvertCanvas(Canvas canvas) {          WriteableBitmap Source = new WriteableBitmap(canvas, /* transform = */ null);          Source.Invalidate();          return Source;     }