[tests] Add record-test.sh

test/shaping/Makefile.am

@@ -20,6 +20,7 @@ EXTRA_DIST += \
 	hb-unicode-decode \
 	hb-unicode-encode \
 	hb-unicode-prettyname \
+	record-test.sh \
 	run-tests.sh \
 	texts/in-tree \
 	fonts/sha1sum \

test/shaping/record-test.sh

@@ -0,0 +1,49 @@
+#!/bin/bash
+
+dir=`mktemp --directory`
+
+hb_shape=$1
+fontfile=$2
+unicodes=`./hb-unicode-decode`
+text=`./hb-unicode-encode "$unicodes"`
+glyphs=`echo "$text" | $hb_shape "$fontfile"`
+
+cp "$fontfile" "$dir/font.ttf"
+pyftsubset \
+	--glyph-names \
+	"$dir/font.ttf" \
+	--text="$text"
+if ! test -s "$dir/font.ttf.subset"; then
+	echo "Subsetter didn't produce nonempty subset font in $dir/font.ttf.subset" >&2
+	exit 2
+fi
+
+# Verify that subset font produces same glyphs!
+glyphs_subset=`echo "$text" | $hb_shape "$dir/font.ttf.subset"`
+
+if ! test "x$glyphs" = "x$glyphs_subset"; then
+	echo "Subset font produced different glyphs!" >&2
+	echo "Perhaps font doesn't have glyph names; checking visually..." >&2
+	hb_view=${hb_shape//shape/view}
+	echo "$text" | $hb_view "$dir/font.ttf" --output-format=png --output-file="$dir/orig.png"
+	echo "$text" | $hb_view "$dir/font.ttf.subset" --output-format=png --output-file="$dir/subset.png"
+	if ! cmp "$dir/orig.png" "$dir/subset.png"; then
+		echo "Images differ.  Please inspect $dir/*.png." >&2
+		echo "$glyphs"
+		echo "$glyphs_subset"
+		exit 2
+	fi
+	echo "Yep; all good." >&2
+	rm -f "$dir/orig.png"
+	rm -f "$dir/subset.png"
+	glyphs=$glyphs_subset
+fi
+
+sha1sum=`sha1sum "$dir/font.ttf.subset" | cut -d' ' -f1`
+subset="fonts/sha1sum/$sha1sum.ttf"
+mv "$dir/font.ttf.subset" "$subset"
+
+echo "$subset:$unicodes:$glyphs"
+
+rm -f "$dir/font.ttf"
+rmdir "$dir"