move tt sub "ligatures" from calt to ss05

1 files changed, 19 insertions, 0 deletions

diff --git a/src/features/ss05-tt.fea b/src/features/ss05-tt.fea
new file mode 100644
index 000000000..7218233ab
--- /dev/null
+++ b/src/features/ss05-tt.fea
@@ -0,0 +1,19 @@
+# /t/t => /t/t.1  (horizonal stem on left side cut short)
+
+featureNames { name "tt ligatures"; };
+
+lookup sub_tt {
+  # glyphs that when followed by SUB_TT_SRC triggers substitution of the 2nd glyph
+  @SUB_TT_PREV1 = [
+    f
+    r
+    t tbar tcaron tccurl tcedilla
+    tcircumflexbelow tcommaaccent tcurl tdieresis
+    tdotaccent tdotbelow tlinebelow tpalatalhook trthook
+    t.1
+  ];
+  @SUB_TT_SRC = [
+    t
+  ];
+  sub @SUB_TT_PREV1 @SUB_TT_SRC' lookup sub_tt2;
+} sub_tt;