diff --git a/tests/visual_tests/images/lines-shield-400-400-2.0-agg-reference.png b/tests/visual_tests/images/lines-shield-400-400-2.0-agg-reference.png
index 75a0ec6a2..e0d4f1527 100644
Binary files a/tests/visual_tests/images/lines-shield-400-400-2.0-agg-reference.png and b/tests/visual_tests/images/lines-shield-400-400-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/lines-shield-400-400-2.0-cairo-reference.png b/tests/visual_tests/images/lines-shield-400-400-2.0-cairo-reference.png
index 5f32ddaf0..5c9ab2735 100644
Binary files a/tests/visual_tests/images/lines-shield-400-400-2.0-cairo-reference.png and b/tests/visual_tests/images/lines-shield-400-400-2.0-cairo-reference.png differ
diff --git a/tests/visual_tests/images/lines-shield-600-600-2.0-agg-reference.png b/tests/visual_tests/images/lines-shield-600-600-2.0-agg-reference.png
index bb72ab224..883957e23 100644
Binary files a/tests/visual_tests/images/lines-shield-600-600-2.0-agg-reference.png and b/tests/visual_tests/images/lines-shield-600-600-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/lines-shield-600-600-2.0-cairo-reference.png b/tests/visual_tests/images/lines-shield-600-600-2.0-cairo-reference.png
index 4da5d5c92..f903dbe3c 100644
Binary files a/tests/visual_tests/images/lines-shield-600-600-2.0-cairo-reference.png and b/tests/visual_tests/images/lines-shield-600-600-2.0-cairo-reference.png differ
diff --git a/tests/visual_tests/images/shield-on-line-and-avoid-edges-512-512-2.0-agg-reference.png b/tests/visual_tests/images/shield-on-line-and-avoid-edges-512-512-2.0-agg-reference.png
index 65b3f1bb7..d90bb1a3d 100644
Binary files a/tests/visual_tests/images/shield-on-line-and-avoid-edges-512-512-2.0-agg-reference.png and b/tests/visual_tests/images/shield-on-line-and-avoid-edges-512-512-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shield-on-polygon-600-400-2.0-agg-reference.png b/tests/visual_tests/images/shield-on-polygon-600-400-2.0-agg-reference.png
index 766296a41..5a82b5020 100644
Binary files a/tests/visual_tests/images/shield-on-polygon-600-400-2.0-agg-reference.png and b/tests/visual_tests/images/shield-on-polygon-600-400-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shield-on-polygon-600-400-2.0-cairo-reference.png b/tests/visual_tests/images/shield-on-polygon-600-400-2.0-cairo-reference.png
index 0d4c6a74c..2b00f7f65 100644
Binary files a/tests/visual_tests/images/shield-on-polygon-600-400-2.0-cairo-reference.png and b/tests/visual_tests/images/shield-on-polygon-600-400-2.0-cairo-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-490-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-490-100-2.0-agg-reference.png
index 6b8ad7256..9751514da 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-490-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-490-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-495-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-495-100-2.0-agg-reference.png
index 816431116..6be60b538 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-495-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-495-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-497-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-497-100-2.0-agg-reference.png
index d6c3f5c1e..ec5e57329 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-497-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-497-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-498-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-498-100-2.0-agg-reference.png
index 860574af0..3994626af 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-498-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-498-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-499-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-499-100-2.0-agg-reference.png
index ba68e2399..9b629f828 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-499-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-499-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-500-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-500-100-2.0-agg-reference.png
index 11031f402..afc7d43b5 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-500-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-500-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-501-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-501-100-2.0-agg-reference.png
index 221ee2e52..9d1902ba3 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-501-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-501-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-502-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-502-100-2.0-agg-reference.png
index 703584bdd..039dc5d62 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-502-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-502-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-505-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-505-100-2.0-agg-reference.png
index ea4f1cdfa..3884f0270 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-505-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-505-100-2.0-agg-reference.png differ
diff --git a/tests/visual_tests/images/shieldsymbolizer-4-510-100-2.0-agg-reference.png b/tests/visual_tests/images/shieldsymbolizer-4-510-100-2.0-agg-reference.png
index fb7a29397..9af536e35 100644
Binary files a/tests/visual_tests/images/shieldsymbolizer-4-510-100-2.0-agg-reference.png and b/tests/visual_tests/images/shieldsymbolizer-4-510-100-2.0-agg-reference.png differ