Improve latin kerning and add tests

Ref: #8
and https://gitlab.com/smc/fonts/gayathri/-/issues/19

Makefile

@@ -17,6 +17,7 @@ TTF=$(FONTS:%=$(BLDDIR)/$(NAME)-%.ttf)
 WOFF2=$(FONTS:%=$(BLDDIR)/$(NAME)-%.woff2)
 PDFS=$(FONTS:%=$(BLDDIR)/$(NAME)-%-ligatures.pdf)   \
 	$(FONTS:%=$(BLDDIR)/$(NAME)-%-content.pdf)      \
+	$(FONTS:%=$(BLDDIR)/$(NAME)-%-kerning.pdf)      \
 	$(FONTS:%=$(BLDDIR)/$(NAME)-%-table.pdf)
 
 $(BLDDIR)/%.otf: $(SRCDIR)/%.ufo
@@ -45,6 +46,12 @@ $(BLDDIR)/%-ligatures.pdf: $(BLDDIR)/%.ttf
 		--foreground=333333 --text-file $(tests)/ligatures.txt \
 		--output-file $(BLDDIR)/$(@F);
 
+$(BLDDIR)/%-kerning.pdf: $(BLDDIR)/%.ttf
+	@echo "   TEST    $(@F)"
+	@hb-view $< --font-size 14 --margin 100 --line-space 1.5 \
+		--foreground=333333 --text-file $(tests)/kerning.txt \
+		--output-file $(BLDDIR)/$(@F);
+
 $(BLDDIR)/%-content.pdf: $(BLDDIR)/%.ttf
 	@echo "   TEST    $(@F)"
 	@hb-view $< --font-size 14 --margin 100 --line-space 1.5 \

sources/features/kerning.fea

@@ -14,23 +14,28 @@ lookup viramaPos {
 @lc_left_slant = [v w];
 @lc_left_round = [e c a d o q g];
 @lc_right_round = [a e b c o p g];
+@lc_postive_space = [r f y v w ];
+@lc_above_base = [a b c d e f h i k l m n o r s t u v w x z];
+@lc_negative_space = [j];
 
 @uc_left_slant = [V Y W T];
-@uc_right_slant = [V Y W T];
+@uc_right_slant = [V Y W T F];
 @uc_left_round = [O Q];
 @uc_right_round = [O Q D P];
 
 lookup latinPos {
   lookupflag 0;
     pos @lc_right_slant @lc_left_round -50;
     pos @lc_right_round @lc_left_slant -50;
+    pos @lc_postive_space @lc_negative_space -350;
+    pos @lc_above_base @lc_negative_space -300;
 
     pos @uc_right_slant @lc_left_round  -160;
     pos @uc_right_slant @uc_left_slant  -160;
 
-    pos A @uc_left_slant -160;
+    pos A @uc_left_slant -200;
     pos A @lc_left_slant -80;
-    pos @uc_right_slant A -160;
+    pos @uc_right_slant A -200;
 
     pos @uc_right_slant @uc_left_round -160;
     pos @uc_right_round @uc_left_slant -160;

tests/content.txt

@@ -284,9 +284,3 @@ Le droit au respect de la vie privée figure à l'article 12 de Déclaration
 universelle des droits de l'homme de 19481, à l'article 8 de la Convention
 européenne des droits de l'homme et à l'article 17 du Pacte
 
-PJ GAYATHRI SANTHOSH BINOY KAVYA DOMINIC ADHESION OFFER YOURS APPLE TV YAVYLT
-Va Ve We Ya Ye ve
-we ye te tv fv vo ovowa
-Tv Ao AO To TO Lo La LV LW LO WJ VJ
-
-ന്റ് അത്" "()" അത്) ന്റി ന്റീ