test(shapers): Add variable font shaping test

Makefile-fonts

@@ -41,6 +41,12 @@ TESTFONTFILES += NotoSerifCJK-Regular.ttc
 TESTFONTFILES += SBL_Hbrw.ttf
 TESTFONTFILES += TwemojiMozilla.ttf
 
+if FONT_VARIATIONS
+TESTFONTFILES += Tourney[wdth,wght].ttf
+endif
+
+comma = ,
+varencode = $(subst $(comma),%2C,$(subst [,%5B,$(subst ],%5D,$(1))))
 notobase = $(shell echo $(notdir $1) | sed -e 's/-.*//')
 
 # Tell make how to download individual font files directly (when available)
@@ -60,6 +66,9 @@ notobase = $(shell echo $(notdir $1) | sed -e 's/-.*//')
 .fonts/Symbola.otf: | .fonts
 	$(CURL) -fsSL https://github.com/ChiefMikeK/ttf-symbola/raw/master/Symbola-13.otf -o $@
 
+.fonts/Tourney%: | .fonts
+	$(CURL) -fsSL https://raw.githubusercontent.com/Etcetera-Type-Co/Tourney/643f1026ad6d41b4527f42cd93c776414fdd6503/fonts/variable/$(call varencode,$(notdir $@)) -o $@
+
 .fonts/TwemojiMozilla.ttf: | .fonts
 	$(CURL) -fsSL https://github.com/mozilla/twemoji-colr/releases/download/v0.5.1/$(notdir $@) -o $@
 

Makefile.am

@@ -22,6 +22,15 @@ include Makefile-luarocks
 # Actual rules for downloading test fonts are in a separate file
 include Makefile-fonts
 
+# Our regression test suite includes test for all features. Anything that is
+# only expected to work with code behind a feature flag needs to be filtered
+# out if we are configured with the feature disabled.
+if !FONT_VARIATIONS
+TESTSRCS ?= $_TESTSRCS
+else
+TESTSRCS ?= $(filter-out tests/variations-%,$(_TESTSRCS))
+endif
+
 # Since we can't use $(wildcard ...) in automake file lists, we generate a file
 # with a script that builds our dynamic file lists instead. This is tricky,
 # because if we just include the file automake will flatten this include. By

build-aux/list-dist-files.sh.in

@@ -16,7 +16,7 @@ finder lua-libraries -name '*.lua'
 printf '\n%s' "LUAMODULES ="
 finder lua_modules -not -name "'*~'"
 
-printf '\n%s' "TESTSRCS ?="
+printf '\n%s' "TESTSRCS :="
 finder tests -maxdepth 1 -name '*.sil'
 finder tests -maxdepth 1 -name '*.xml'
 finder tests -maxdepth 1 -name '*.lua'

tests/variations-axis.expected

@@ -0,0 +1,16 @@
+Set paper size 	297.6377985	419.5275636
+Begin page
+Mx 	14.8819
+My 	56.9764
+Set font 	Tourney;48;400;;normal;;wght=150,wdth=120;LTR
+T	68 369 369 w=104.0880	(Foo)
+Mx 	138.3008
+T	272 244 408 w=101.0400	(bar)
+Mx 	14.8819
+My 	114.5764
+Set font 	Tourney;48;750;;normal;;wdth=80;LTR
+T	68 369 369 w=68.3520	(Foo)
+Mx 	95.6771
+T	272 244 408 w=72.2880	(bar)
+End page
+Finish

tests/variations-axis.sil

@@ -0,0 +1,7 @@
+\begin[papersize=a6]{document}
+\neverindent
+\nofolios
+\font[family=Tourney,size=48pt]
+\font[variations="wght=150,wdth=120"]{Foo bar}\par
+\font[weight=750,variations=wdth=80]{Foo bar}
+\end{document}