1 files changed, 119 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/graph/test-classdef-graph.cc b/gfx/harfbuzz/src/graph/test-classdef-graph.cc
new file mode 100644
index 0000000000..55854ff5c2
--- /dev/null
+++ b/gfx/harfbuzz/src/graph/test-classdef-graph.cc
@@ -0,0 +1,119 @@
+/*
+ * 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 "gsubgpos-context.hh"
+#include "classdef-graph.hh"
+
+typedef hb_pair_t<hb_codepoint_t, hb_codepoint_t> gid_and_class_t;
+typedef hb_vector_t<gid_and_class_t> gid_and_class_list_t;
+
+
+static bool incremental_size_is (const gid_and_class_list_t& list, unsigned klass,
+                                 unsigned cov_expected, unsigned class_def_expected)
+{
+  graph::class_def_size_estimator_t estimator (list.iter ());
+
+  unsigned result = estimator.incremental_coverage_size (klass);
+  if (result != cov_expected)
+  {
+    printf ("FAIL: coverage expected size %u but was %u\n", cov_expected, result);
+    return false;
+  }
+
+  result = estimator.incremental_class_def_size (klass);
+  if (result != class_def_expected)
+  {
+    printf ("FAIL: class def expected size %u but was %u\n", class_def_expected, result);
+    return false;
+  }
+
+  return true;
+}
+
+static void test_class_and_coverage_size_estimates ()
+{
+  gid_and_class_list_t empty = {
+  };
+  assert (incremental_size_is (empty, 0, 0, 0));
+  assert (incremental_size_is (empty, 1, 0, 0));
+
+  gid_and_class_list_t class_zero = {
+    {5, 0},
+  };
+  assert (incremental_size_is (class_zero, 0, 2, 0));
+
+  gid_and_class_list_t consecutive = {
+    {4, 0},
+    {5, 0},
+    {6, 1},
+    {7, 1},
+    {8, 2},
+    {9, 2},
+    {10, 2},
+    {11, 2},
+  };
+  assert (incremental_size_is (consecutive, 0, 4, 0));
+  assert (incremental_size_is (consecutive, 1, 4, 4));
+  assert (incremental_size_is (consecutive, 2, 8, 6));
+
+  gid_and_class_list_t non_consecutive = {
+    {4, 0},
+    {5, 0},
+
+    {6, 1},
+    {7, 1},
+
+    {9, 2},
+    {10, 2},
+    {11, 2},
+    {12, 2},
+  };
+  assert (incremental_size_is (non_consecutive, 0, 4, 0));
+  assert (incremental_size_is (non_consecutive, 1, 4, 6));
+  assert (incremental_size_is (non_consecutive, 2, 8, 6));
+
+  gid_and_class_list_t multiple_ranges = {
+    {4, 0},
+    {5, 0},
+
+    {6, 1},
+    {7, 1},
+
+    {9, 1},
+
+    {11, 1},
+    {12, 1},
+    {13, 1},
+  };
+  assert (incremental_size_is (multiple_ranges, 0, 4, 0));
+  assert (incremental_size_is (multiple_ranges, 1, 2 * 6, 3 * 6));
+}
+
+int
+main (int argc, char **argv)
+{
+  test_class_and_coverage_size_estimates ();
+}