From f18bc0766a15e8b23ed05a303851b60e11715d25 Mon Sep 17 00:00:00 2001
From: Eliot Jones <elioty@hotmail.co.uk>
Date: Sun, 19 Apr 2020 10:28:11 +0100
Subject: [PATCH] #161 handle zero point size by using rotated matrix

---
 src/UglyToad.PdfPig/Graphics/ContentStreamProcessor.cs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/UglyToad.PdfPig/Graphics/ContentStreamProcessor.cs b/src/UglyToad.PdfPig/Graphics/ContentStreamProcessor.cs
index 3eaafab0..55bad920 100644
--- a/src/UglyToad.PdfPig/Graphics/ContentStreamProcessor.cs
+++ b/src/UglyToad.PdfPig/Graphics/ContentStreamProcessor.cs
@@ -178,7 +178,13 @@
 
             // TODO: this does not seem correct, produces the correct result for now but we need to revisit.
             // see: https://stackoverflow.com/questions/48010235/pdf-specification-get-font-size-in-points
-            var pointSize = Math.Round(transformationMatrix.Multiply(TextMatrices.TextMatrix).Multiply(fontSize).A, 2);
+            var fontSizeMatrix = transformationMatrix.Multiply(TextMatrices.TextMatrix).Multiply(fontSize);
+            var pointSize = Math.Round(fontSizeMatrix.A, 2);
+            // Assume a rotated letter
+            if (pointSize == 0)
+            {
+                pointSize = Math.Round(fontSizeMatrix.B, 2);
+            }
 
             if (pointSize < 0)
             {