[instancer] add a unit testcase for instantiating item variations

src/Makefile.am

@@ -458,6 +458,7 @@ COMPILED_TESTS = \
 	test-classdef-graph \
 	test-instancer-solver \
 	test-tuple-varstore \
+	test-item-varstore \
 	$(NULL)
 COMPILED_TESTS_CPPFLAGS = $(HBCFLAGS) -DMAIN -UNDEBUG
 COMPILED_TESTS_LDADD = libharfbuzz.la $(HBLIBS)
@@ -536,6 +537,10 @@ test_tuple_varstore_SOURCES = test-tuple-varstore.cc hb-subset-instancer-solver.
 test_tuple_varstore_CPPFLAGS = $(COMPILED_TESTS_CPPFLAGS)
 test_tuple_varstore_LDADD = $(COMPILED_TESTS_LDADD)
 
+test_item_varstore_SOURCES = test-item-varstore.cc hb-subset-instancer-solver.cc hb-static.cc
+test_item_varstore_CPPFLAGS = $(COMPILED_TESTS_CPPFLAGS)
+test_item_varstore_LDADD = $(COMPILED_TESTS_LDADD)
+
 dist_check_SCRIPTS = \
 	check-c-linkage-decls.py \
 	check-externs.py \

src/meson.build

@@ -703,6 +703,7 @@ if get_option('tests').enabled()
       'test-serialize': ['test-serialize.cc', 'hb-static.cc'],
       'test-set': ['test-set.cc', 'hb-static.cc'],
       'test-tuple-varstore': ['test-tuple-varstore.cc', 'hb-subset-instancer-solver.cc', 'hb-static.cc'],
+      'test-item-varstore': ['test-item-varstore.cc', 'hb-subset-instancer-solver.cc', 'hb-static.cc'],
       'test-use-table': 'test-use-table.cc',
       'test-vector': ['test-vector.cc', 'hb-static.cc'],
     }

src/test-item-varstore.cc

@@ -0,0 +1,66 @@
+/*
+ * Copyright © 2020  Google, 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.
+ *
+ */
+#include "hb-ot-var-common.hh"
+#include "hb-ot-var-hvar-table.hh"
+// HVAR table data from SourceSerif4Variable-Roman_subset.otf
+const char hvar_data[] = "\x0\x1\x0\x0\x0\x0\x0\x14\x0\x0\x0\xc4\x0\x0\x0\x0\x0\x0\x0\x0\x0\x1\x0\x0\x0\x10\x0\x2\x0\x0\x0\x74\x0\x0\x0\x7a\x0\x2\x0\x8\xc0\x0\xc0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x40\x0\x40\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\xc0\x0\xc0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x0\x40\x0\x40\x0\xc0\x0\xc0\x0\x0\x0\xc0\x0\xc0\x0\x0\x0\xc0\x0\xc0\x0\x0\x0\x0\x0\x40\x0\x40\x0\x0\x0\x40\x0\x40\x0\xc0\x0\xc0\x0\x0\x0\x0\x0\x40\x0\x40\x0\x0\x0\x40\x0\x40\x0\x0\x1\x0\x0\x0\x0\x0\x4\x0\x0\x0\x8\x0\x0\x0\x1\x0\x2\x0\x3\x0\x4\x0\x5\x0\x6\x0\x7\xf9\xf\x2f\xbf\xfb\xfb\x35\xf9\x4\x4\xf3\xb4\xf2\xfb\x2e\xf3\x4\x4\xe\xad\xfa\x1\x1a\x1\x15\x22\x59\xd6\xe3\xf6\x6\xf5\x0\x1\x0\x5\x0\x4\x7\x5\x6";
+
+static void
+test_item_variations ()
+{
+  const OT::HVAR* hvar_table = reinterpret_cast<const OT::HVAR*> (hvar_data);
+
+  hb_tag_t axis_tag = HB_TAG ('w', 'g', 'h', 't');
+  hb_map_t axis_idx_tag_map;
+  axis_idx_tag_map.set (0, axis_tag);
+
+  axis_tag = HB_TAG ('o', 'p', 's', 'z');
+  axis_idx_tag_map.set (1, axis_tag);
+
+  OT::item_variations_t item_vars;
+  const OT::VariationStore& src_var_store = hvar_table+(hvar_table->varStore);
+  bool result = item_vars.create_from_item_varstore (src_var_store, axis_idx_tag_map);
+      
+  assert (result);
+
+  /* partial instancing wght=300:800 */
+  hb_hashmap_t<hb_tag_t, Triple> normalized_axes_location;
+  normalized_axes_location.set (axis_tag, Triple (-0.512817f, 0.f, 0.700012f));
+
+  hb_hashmap_t<hb_tag_t, TripleDistances> axes_triple_distances;
+  axes_triple_distances.set (axis_tag, TripleDistances (200.f, 500.f));
+
+  result = item_vars.instantiate (normalized_axes_location, axes_triple_distances);
+  assert (result);
+  result = item_vars.optimize ();
+  assert (result);
+  assert (item_vars.get_region_list().length == 8);
+}
+
+int
+main (int argc, char **argv)
+{
+  test_item_variations ();
+}