[subset] add basic test for CFF2 subsetting.

FontTools does not yet support CFF2 subsetting so we can't add a comparison test. Instead add a golden file test.

test/api/meson.build

@@ -17,6 +17,7 @@ tests = [
   'test-draw.c',
   'test-font.c',
   'test-font-scale.c',
+  'test-instance-cff2.c',
   'test-map.c',
   'test-object.c',
   'test-ot-alternates.c',
@@ -87,16 +88,22 @@ env.set('G_TEST_SRCDIR', meson.current_source_dir())
 env.set('G_TEST_BUILDDIR', meson.current_build_dir())
 
 foreach source : tests
+  cpp_args = []
   test_name = source.split('.')[0]
 
   deps = [glib_dep, freetype_dep, thread_dep, libharfbuzz_dep, libharfbuzz_icu_dep]
   suite = ['api']
-  if test_name.contains('-subset')
+  if test_name.contains('-subset') or test_name.contains('-instance')
     deps += libharfbuzz_subset_dep
     suite += 'subset'
   endif
 
+  if test_name.contains('-instance')
+    cpp_args += '-DHB_EXPERIMENTAL_API'
+  endif
+
   test(test_name, executable(test_name, source,
+    cpp_args:  cpp_args,
     include_directories: [incconfig],
     dependencies: deps,
     install: false,

test/api/test-instance-cff2.c

@@ -0,0 +1,75 @@
+/*
+ * Copyright © 2022  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.
+ *
+ * Google Author(s): Garret Rieger
+ */
+
+#include "hb-test.h"
+#include "hb-subset-test.h"
+
+
+static void
+test_instance_cff2 (void)
+{
+  hb_face_t *face_abc = hb_test_open_font_file ("fonts/AdobeVFPrototype.abc.otf");
+  hb_face_t *expected = hb_test_open_font_file ("fonts/AdobeVFPrototype.abc.static.otf");
+
+  hb_set_t *codepoints = hb_set_create();
+  hb_face_t *face_abc_subset;
+  hb_set_add (codepoints, 97);
+  hb_set_add (codepoints, 98);
+  hb_set_add (codepoints, 99);
+
+  hb_subset_input_t* input = hb_subset_test_create_input (codepoints);
+  hb_subset_input_pin_axis_location (input,
+                                     face_abc,
+                                     HB_TAG ('w', 'g', 'h', 't'),
+                                     250);
+  hb_subset_input_pin_axis_location (input,
+                                     face_abc,
+                                     HB_TAG ('C', 'N', 'T', 'R'),
+                                     0);
+
+  face_abc_subset = hb_subset_test_create_subset (face_abc, input);
+  hb_set_destroy (codepoints);
+
+  hb_subset_test_check (expected, face_abc_subset, HB_TAG ('C','F','F', '2'));
+  g_assert (hb_face_reference_table (face_abc_subset, HB_TAG ('f', 'v', 'a', 'r'))
+            == hb_blob_get_empty ());
+
+  hb_face_destroy (face_abc_subset);
+  hb_face_destroy (face_abc);
+  hb_face_destroy (expected);
+}
+
+
+
+int
+main (int argc, char **argv)
+{
+  hb_test_init (&argc, &argv);
+
+  hb_test_add (test_instance_cff2);
+
+  return hb_test_run();
+}