added api test for subset VVAR & bug fix

added a mod copy of SourceSerifVariable-Roman.ttf with VVAR as a test font

src/hb-ot-var-hvar-table.hh

@@ -123,9 +123,8 @@ struct index_map_subset_plan_t
 {
   enum index_map_index_t {
     ADV_INDEX,
-    LSB_INDEX,
-    RSB_INDEX,
-    TSB_INDEX,
+    LSB_INDEX,	/* dual as TSB */
+    RSB_INDEX,	/* dual as BSB */
     VORG_INDEX
   };
 
@@ -217,7 +216,7 @@ struct index_map_subset_plan_t
     for (unsigned int i = 0; i < max_inners.length; i++)
     {
       if (inner_remaps[i].get_count () == 0) continue;
-      unsigned int bit_count = hb_bit_storage (inner_remaps[i][max_inners[i]]);
+      unsigned int bit_count = (max_inners[i]==0)? 1: hb_bit_storage (inner_remaps[i][max_inners[i]]);
       if (bit_count > inner_bit_count) inner_bit_count = bit_count;
     }
 

test/api/Makefile.am

@@ -52,6 +52,7 @@ TEST_PROGS = \
 	test-subset-cff2 \
 	test-subset-gvar \
 	test-subset-hvar \
+	test-subset-vvar \
 	test-unicode \
 	test-version \
 	$(NULL)
@@ -68,6 +69,7 @@ test_subset_cff1_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_cff2_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_gvar_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 test_subset_hvar_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
+test_subset_vvar_LDADD = $(LDADD) $(top_builddir)/src/libharfbuzz-subset.la
 
 test_unicode_CPPFLAGS = \
 	$(AM_CPPFLAGS) \

test/api/test-subset-vvar.c

@@ -0,0 +1,103 @@
+/*
+ * Copyright © 2019 Adobe Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Adobe Author(s): Michiharu Ariza
+ */
+
+#include "hb-test.h"
+#include "hb-subset-test.h"
+
+/* Unit tests for VVAR subsetting */
+
+static void
+test_subset_VVAR_noop (void)
+{
+  hb_face_t *face_abc = hb_test_open_font_file("fonts/SourceSerifVariable-Roman-VVAR.abc.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_abc_subset;
+  hb_set_add (codepoints, 'a');
+  hb_set_add (codepoints, 'b');
+  hb_set_add (codepoints, 'c');
+  face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_abc, face_abc_subset, HB_TAG ('V','V','A','R'));
+
+  hb_face_destroy (face_abc_subset);
+  hb_face_destroy (face_abc);
+}
+
+static void
+test_subset_VVAR (void)
+{
+  hb_face_t *face_abc = hb_test_open_font_file ("fonts/SourceSerifVariable-Roman-VVAR.abc.ttf");
+  hb_face_t *face_ac = hb_test_open_font_file ("fonts/SourceSerifVariable-Roman-VVAR.ac.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_abc_subset;
+  hb_set_add (codepoints, 'a');
+  hb_set_add (codepoints, 'c');
+  face_abc_subset = hb_subset_test_create_subset (face_abc, hb_subset_test_create_input (codepoints));
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('V','V','A','R'));
+
+  hb_face_destroy (face_abc_subset);
+  hb_face_destroy (face_abc);
+  hb_face_destroy (face_ac);
+}
+
+static void
+test_subset_VVAR_retaingids (void)
+{
+  hb_face_t *face_abc = hb_test_open_font_file ("fonts/SourceSerifVariable-Roman-VVAR.abc.ttf");
+  hb_face_t *face_ac = hb_test_open_font_file ("fonts/SourceSerifVariable-Roman-VVAR.ac.retaingids.ttf");
+
+  hb_set_t *codepoints = hb_set_create ();
+  hb_face_t *face_abc_subset;
+  hb_set_add (codepoints, 'a');
+  hb_set_add (codepoints, 'c');
+  hb_subset_input_t *input = hb_subset_test_create_input (codepoints);
+  hb_subset_input_set_retain_gids (input, true);
+  face_abc_subset = hb_subset_test_create_subset (face_abc, input);
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (face_ac, face_abc_subset, HB_TAG ('V','V','A','R'));
+
+  hb_face_destroy (face_abc_subset);
+  hb_face_destroy (face_abc);
+  hb_face_destroy (face_ac);
+}
+
+int
+main (int argc, char **argv)
+{
+  hb_test_init (&argc, &argv);
+
+  hb_test_add (test_subset_VVAR_noop);
+  hb_test_add (test_subset_VVAR);
+  hb_test_add (test_subset_VVAR_retaingids);
+
+  return hb_test_run ();
+}