Support 'opbd' (OpenType protrusion) feature

Code scrapped from ConTeXt, AFAIK, no font implements OpenType optical
bounds (on of Linux Libertine font has traces of it), but I plan to use
it in my fonts. The committed feature file is prepared for Pagella, we
can later have font specific feature files like this.

1 files changed, 244 insertions, 0 deletions

diff --git a/tests/opbd.fea b/tests/opbd.fea
new file mode 100644
index 0000000..affc3c5
--- /dev/null
+++ b/tests/opbd.fea
@@ -0,0 +1,244 @@
+
+lookup RightBounds {
+  lookupflag 0;
+    pos \exclam <100 0 0 0>;
+    pos \percent <100 0 0 0>;
+    pos \ampersand <100 0 0 0>;
+    pos \parenright <300 0 0 0>;
+    pos \asterisk <200 0 0 0>;
+    pos \plus <250 0 0 0>;
+    pos \comma <500 0 0 0>;
+    pos \hyphen <500 0 0 0>;
+    pos \period <700 0 0 0>;
+    pos \slash <300 0 0 0>;
+    pos \one <100 0 0 0>;
+    pos \seven <50 0 0 0>;
+    pos \colon <500 0 0 0>;
+    pos \semicolon <500 0 0 0>;
+    pos \question <200 0 0 0>;
+    pos \at <50 0 0 0>;
+    pos \A <50 0 0 0>;
+    pos \K <50 0 0 0>;
+    pos \L <50 0 0 0>;
+    pos \T <50 0 0 0>;
+    pos \V <50 0 0 0>;
+    pos \W <50 0 0 0>;
+    pos \X <50 0 0 0>;
+    pos \Y <50 0 0 0>;
+    pos \k <50 0 0 0>;
+    pos \p <50 0 0 0>;
+    pos \r <50 0 0 0>;
+    pos \v <50 0 0 0>;
+    pos \w <50 0 0 0>;
+    pos \x <50 0 0 0>;
+    pos \y <70 0 0 0>;
+    pos \asciitilde <250 0 0 0>;
+    pos \Agrave <50 0 0 0>;
+    pos \Aacute <50 0 0 0>;
+    pos \Acircumflex <50 0 0 0>;
+    pos \Atilde <50 0 0 0>;
+    pos \Adieresis <50 0 0 0>;
+    pos \Aring <50 0 0 0>;
+    pos \Amacron <50 0 0 0>;
+    pos \Abreve <50 0 0 0>;
+    pos \Aogonek <50 0 0 0>;
+    pos \Kcommaaccent <50 0 0 0>;
+    pos \kcommaaccent <50 0 0 0>;
+    pos \Lacute <50 0 0 0>;
+    pos \Lcommaaccent <50 0 0 0>;
+    pos \Lcaron <50 0 0 0>;
+    pos \Ldot <50 0 0 0>;
+    pos \Lslash <50 0 0 0>;
+    pos \racute <50 0 0 0>;
+    pos \rcommaaccent <50 0 0 0>;
+    pos \rcaron <50 0 0 0>;
+    pos \wcircumflex <50 0 0 0>;
+    pos \ycircumflex <70 0 0 0>;
+    pos \Acaron <50 0 0 0>;
+    pos \Aringacute <50 0 0 0>;
+    pos \Adblgrave <50 0 0 0>;
+    pos \rdblgrave <50 0 0 0>;
+    pos \uni021A <50 0 0 0>;
+    pos \Alpha <50 0 0 0>;
+    pos \Kappa <50 0 0 0>;
+    pos \Lambda <50 0 0 0>;
+    pos \Tau <50 0 0 0>;
+    pos \Ldotbelow <50 0 0 0>;
+    pos \Ldotbelowmacron <50 0 0 0>;
+    pos \rdotaccent <50 0 0 0>;
+    pos \rdotbelow <50 0 0 0>;
+    pos \rdotbelowmacron <50 0 0 0>;
+    pos \Tdotbelow <50 0 0 0>;
+    pos \Tlinebelow <50 0 0 0>;
+    pos \wgrave <50 0 0 0>;
+    pos \wacute <50 0 0 0>;
+    pos \wdieresis <50 0 0 0>;
+    pos \Ahookabove <50 0 0 0>;
+    pos \Acircumflexacute <50 0 0 0>;
+    pos \Acircumflexgrave <50 0 0 0>;
+    pos \Acircumflexhookabove <50 0 0 0>;
+    pos \Acircumflextilde <50 0 0 0>;
+    pos \Acircumflexdotbelow <50 0 0 0>;
+    pos \Abreveacute <50 0 0 0>;
+    pos \Abrevegrave <50 0 0 0>;
+    pos \Abrevehookabove <50 0 0 0>;
+    pos \Abrevetilde <50 0 0 0>;
+    pos \Abrevedotbelow <50 0 0 0>;
+    pos \ygrave <70 0 0 0>;
+    pos \ydotbelow <70 0 0 0>;
+    pos \yhookabove <70 0 0 0>;
+    pos \ytilde <70 0 0 0>;
+    pos \endash <300 0 0 0>;
+    pos \emdash <200 0 0 0>;
+    pos \quoteleft <700 0 0 0>;
+    pos \quoteright <700 0 0 0>;
+    pos \quotedblleft <400 0 0 0>;
+    pos \quotedblright <400 0 0 0>;
+    pos \Aogonekacute <50 0 0 0>;
+    pos \L_uni0303 <50 0 0 0>;
+    pos \T_uni0303 <50 0 0 0>;
+    pos \T_uni0308 <50 0 0 0>;
+} RightBounds;
+
+lookup LeftBounds {
+  lookupflag 0;
+    pos \percent <-100 0 -100 0>;
+    pos \ampersand <-50 0 -50 0>;
+    pos \parenleft <-100 0 -100 0>;
+    pos \asterisk <-200 0 -200 0>;
+    pos \plus <-250 0 -250 0>;
+    pos \hyphen <-400 0 -400 0>;
+    pos \slash <-200 0 -200 0>;
+    pos \one <-100 0 -100 0>;
+    pos \at <-50 0 -50 0>;
+    pos \A <-50 0 -50 0>;
+    pos \J <-50 0 -50 0>;
+    pos \T <-50 0 -50 0>;
+    pos \V <-50 0 -50 0>;
+    pos \W <-50 0 -50 0>;
+    pos \X <-50 0 -50 0>;
+    pos \Y <-50 0 -50 0>;
+    pos \p <-50 0 -50 0>;
+    pos \q <-50 0 -50 0>;
+    pos \v <-50 0 -50 0>;
+    pos \w <-50 0 -50 0>;
+    pos \x <-50 0 -50 0>;
+    pos \y <-50 0 -50 0>;
+    pos \asciitilde <-200 0 -200 0>;
+    pos \Agrave <-50 0 -50 0>;
+    pos \Aacute <-50 0 -50 0>;
+    pos \Acircumflex <-50 0 -50 0>;
+    pos \Atilde <-50 0 -50 0>;
+    pos \Adieresis <-50 0 -50 0>;
+    pos \Aring <-50 0 -50 0>;
+    pos \Amacron <-50 0 -50 0>;
+    pos \Abreve <-50 0 -50 0>;
+    pos \Aogonek <-50 0 -50 0>;
+    pos \Jcircumflex <-50 0 -50 0>;
+    pos \wcircumflex <-50 0 -50 0>;
+    pos \ycircumflex <-50 0 -50 0>;
+    pos \Acaron <-50 0 -50 0>;
+    pos \Aringacute <-50 0 -50 0>;
+    pos \Adblgrave <-50 0 -50 0>;
+    pos \uni021A <-50 0 -50 0>;
+    pos \Alpha <-50 0 -50 0>;
+    pos \Lambda <-50 0 -50 0>;
+    pos \Tau <-50 0 -50 0>;
+    pos \Tdotbelow <-50 0 -50 0>;
+    pos \Tlinebelow <-50 0 -50 0>;
+    pos \wgrave <-50 0 -50 0>;
+    pos \wacute <-50 0 -50 0>;
+    pos \wdieresis <-50 0 -50 0>;
+    pos \Ahookabove <-50 0 -50 0>;
+    pos \Acircumflexacute <-50 0 -50 0>;
+    pos \Acircumflexgrave <-50 0 -50 0>;
+    pos \Acircumflexhookabove <-50 0 -50 0>;
+    pos \Acircumflextilde <-50 0 -50 0>;
+    pos \Acircumflexdotbelow <-50 0 -50 0>;
+    pos \Abreveacute <-50 0 -50 0>;
+    pos \Abrevegrave <-50 0 -50 0>;
+    pos \Abrevehookabove <-50 0 -50 0>;
+    pos \Abrevetilde <-50 0 -50 0>;
+    pos \Abrevedotbelow <-50 0 -50 0>;
+    pos \ygrave <-50 0 -50 0>;
+    pos \ydotbelow <-50 0 -50 0>;
+    pos \yhookabove <-50 0 -50 0>;
+    pos \ytilde <-50 0 -50 0>;
+    pos \endash <-300 0 -300 0>;
+    pos \emdash <-200 0 -200 0>;
+    pos \quoteleft <-500 0 -500 0>;
+    pos \quoteright <-500 0 -500 0>;
+    pos \quotedblleft <-300 0 -300 0>;
+    pos \quotedblright <-300 0 -300 0>;
+    pos \Aogonekacute <-50 0 -50 0>;
+    pos \J_uni030C.cap <-50 0 -50 0>;
+    pos \T_uni0303 <-50 0 -50 0>;
+    pos \T_uni0308 <-50 0 -50 0>;
+} LeftBounds;
+
+feature rtbd {
+
+  script DFLT;
+     language dflt ;
+      lookup RightBounds;
+
+  script grek;
+     language dflt ;
+      lookup RightBounds;
+
+  script latn;
+     language dflt ;
+      lookup RightBounds;
+     language AZE  exclude_dflt;
+      lookup RightBounds;
+     language CRT  exclude_dflt;
+      lookup RightBounds;
+     language MOL  exclude_dflt;
+      lookup RightBounds;
+     language NLD  exclude_dflt;
+      lookup RightBounds;
+     language PLK  exclude_dflt;
+      lookup RightBounds;
+     language ROM  exclude_dflt;
+      lookup RightBounds;
+     language TRK  exclude_dflt;
+      lookup RightBounds;
+
+  script thai;
+     language dflt ;
+      lookup RightBounds;
+} rtbd;
+
+feature lfbd {
+
+  script DFLT;
+     language dflt ;
+      lookup LeftBounds;
+
+  script grek;
+     language dflt ;
+      lookup LeftBounds;
+
+  script latn;
+     language dflt ;
+      lookup LeftBounds;
+     language AZE  exclude_dflt;
+      lookup LeftBounds;
+     language CRT  exclude_dflt;
+      lookup LeftBounds;
+     language MOL  exclude_dflt;
+      lookup LeftBounds;
+     language NLD  exclude_dflt;
+      lookup LeftBounds;
+     language PLK  exclude_dflt;
+      lookup LeftBounds;
+     language ROM  exclude_dflt;
+      lookup LeftBounds;
+     language TRK  exclude_dflt;
+      lookup LeftBounds;
+
+  script thai;
+     language dflt ;
+      lookup LeftBounds;
+} lfbd;
+