[instancer] add testing code for change_tuple_variation_axis_limits()

Also fixed a small bug

src/Makefile.am

@@ -532,7 +532,7 @@ test_instancer_solver_SOURCES = test-subset-instancer-solver.cc hb-subset-instan
 test_instancer_solver_CPPFLAGS = $(COMPILED_TESTS_CPPFLAGS)
 test_instancer_solver_LDADD = $(COMPILED_TESTS_LDADD)
 
-test_tuple_varstore_SOURCES = test-tuple-varstore.cc hb-static.cc
+test_tuple_varstore_SOURCES = test-tuple-varstore.cc hb-subset-instancer-solver.cc hb-static.cc
 test_tuple_varstore_CPPFLAGS = $(COMPILED_TESTS_CPPFLAGS)
 test_tuple_varstore_LDADD = $(COMPILED_TESTS_LDADD)
 

src/hb-ot-var-common.hh

@@ -642,7 +642,7 @@ struct TupleVariationData
           if (!out) continue;
           unsigned new_len = new_vars.length + out.length;
 
-          if (unlikely (!new_vars.resize (new_len, false)))
+          if (unlikely (!new_vars.alloc (new_len, false)))
           { fini (); return;}
 
           for (unsigned i = 0; i < out.length; i++)

src/meson.build

@@ -723,7 +723,7 @@ if get_option('tests').enabled()
     'test-vector': ['test-vector.cc', 'hb-static.cc'],
     'test-bimap': ['test-bimap.cc', 'hb-static.cc'],
     'test-instancer-solver': ['test-subset-instancer-solver.cc', 'hb-subset-instancer-solver.cc', 'hb-static.cc'],
-    'test-tuple-varstore': ['test-tuple-varstore.cc', 'hb-static.cc'],
+    'test-tuple-varstore': ['test-tuple-varstore.cc', 'hb-subset-instancer-solver.cc', 'hb-static.cc'],
   }
   foreach name, source : compiled_tests
     if cpp.get_argument_syntax() == 'msvc' and source.contains('hb-static.cc')

src/test-tuple-varstore.cc

@@ -75,6 +75,41 @@ test_decompile_cvar ()
       assert (tuple_variations.tuple_vars[1].deltas_x[i] == deltas_2[i]);
     }
   }
+
+  /* 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));
+
+  tuple_variations.change_tuple_variations_axis_limits (&normalized_axes_location);
+  tuple_variations.merge_tuple_variations ();
+
+  assert (tuple_variations.tuple_vars[0].indices.length == 65);
+  assert (tuple_variations.tuple_vars[1].indices.length == 65);
+  assert (!tuple_variations.tuple_vars[0].deltas_y);
+  assert (!tuple_variations.tuple_vars[1].deltas_y);
+  assert (tuple_variations.tuple_vars[0].axis_tuples.get (axis_tag) == Triple (-1.f, -1.f, 0.f));
+  assert (tuple_variations.tuple_vars[1].axis_tuples.get (axis_tag) == Triple (0.f, 1.f, 1.f));
+
+  hb_vector_t<float> rounded_deltas_1 {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, -1, 0.f, -2, 1, 0.f, -1, 0.f, -2, 1, 0.f, -19, -19, -13, -13, 0.f, 0.f, 0.f, -2, 0.f, 0.f, 0.f, 0.f, 0.f, -2, 0.f, 1, -15, -15, -10.f, -10.f, 0.f, 0.f, 0.f, 1, -15, -15, -10.f, -10.f, 0.f, 0.f, 0.f, 1};
+
+  hb_vector_t<float> rounded_deltas_2 {0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 0.f, 1, 0.f, 4, -2, 0.f, 1, 0.f, 4, -2, 0.f, 68, 68, 48, 48, 0.f, 0.f, 0.f, 4, 0.f, 0.f, 1, -1, 1, 5, -1, -4, 51, 51, 37, 37, 0.f, 0.f, 0.f, -1, 51, 51, 37, 37, 0.f, 0.f, 0.f, -1};
+
+  for (unsigned i = 0; i < 65; i++)
+  {
+    if (i < 23)
+    {
+      assert (tuple_variations.tuple_vars[0].indices[i] == 0);
+      assert (tuple_variations.tuple_vars[1].indices[i] == 0);
+    }
+    else
+    {
+      assert (tuple_variations.tuple_vars[0].indices[i] == 1);
+      assert (tuple_variations.tuple_vars[1].indices[i] == 1);
+      assert (roundf (tuple_variations.tuple_vars[0].deltas_x[i]) == rounded_deltas_1[i]);
+      assert (roundf (tuple_variations.tuple_vars[1].deltas_x[i]) == rounded_deltas_2[i]);
+    }
+  }
+
 }
 
 int