cogl: Move out bitmask unit test to separate file

Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2555>

src/tests/cogl/unit/meson.build

@@ -1,4 +1,5 @@
 cogl_unit_tests = [
+  'test-bitmask',
 ]
 
 test_env = environment()

src/tests/cogl/unit/test-bitmask.c

@@ -0,0 +1,181 @@
+#include "cogl-config.h"
+
+#include "cogl/cogl-bitmask.h"
+#include "tests/cogl-test-utils.h"
+
+typedef struct
+{
+  int n_bits;
+  int *bits;
+} CheckData;
+
+static gboolean
+check_bit (int bit_num, void *user_data)
+{
+  CheckData *data = user_data;
+  int i;
+
+  for (i = 0; i < data->n_bits; i++)
+    {
+      if (data->bits[i] == bit_num)
+        {
+          data->bits[i] = -1;
+          return TRUE;
+        }
+    }
+
+  g_assert_not_reached ();
+
+  return TRUE;
+}
+
+static void
+verify_bits (const CoglBitmask *bitmask,
+             ...)
+{
+  CheckData data;
+  va_list ap, ap_copy;
+  int i;
+
+  va_start (ap, bitmask);
+  G_VA_COPY (ap_copy, ap);
+
+  for (data.n_bits = 0; va_arg (ap, int) != -1; data.n_bits++);
+
+  data.bits = alloca (data.n_bits * (sizeof (int)));
+
+  G_VA_COPY (ap, ap_copy);
+
+  for (i = 0; i < data.n_bits; i++)
+    data.bits[i] = va_arg (ap, int);
+
+  _cogl_bitmask_foreach (bitmask, check_bit, &data);
+
+  for (i = 0; i < data.n_bits; i++)
+    g_assert_cmpint (data.bits[i], ==, -1);
+
+  g_assert_cmpint (_cogl_bitmask_popcount (bitmask), ==, data.n_bits);
+
+  for (i = 0; i < 1024; i++)
+    {
+      int upto_popcount = 0;
+      int j;
+
+      G_VA_COPY (ap, ap_copy);
+
+      for (j = 0; j < data.n_bits; j++)
+        if (va_arg (ap, int) < i)
+          upto_popcount++;
+
+      g_assert_cmpint (_cogl_bitmask_popcount_upto (bitmask, i),
+                       ==,
+                       upto_popcount);
+
+      G_VA_COPY (ap, ap_copy);
+
+      for (j = 0; j < data.n_bits; j++)
+        {
+          if (va_arg (ap, int) == i)
+            break;
+        }
+
+      g_assert_cmpint (_cogl_bitmask_get (bitmask, i), ==, (j < data.n_bits));
+    }
+}
+
+static void
+check_bitmask_api (void)
+{
+  CoglBitmask bitmask;
+  CoglBitmask other_bitmask;
+  /* A dummy bit to make it use arrays sometimes */
+  int dummy_bit;
+  int i;
+
+  for (dummy_bit = -1; dummy_bit < 256; dummy_bit += 40)
+    {
+      _cogl_bitmask_init (&bitmask);
+      _cogl_bitmask_init (&other_bitmask);
+
+      if (dummy_bit != -1)
+        _cogl_bitmask_set (&bitmask, dummy_bit, TRUE);
+
+      verify_bits (&bitmask, dummy_bit, -1);
+
+      _cogl_bitmask_set (&bitmask, 1, TRUE);
+      _cogl_bitmask_set (&bitmask, 4, TRUE);
+      _cogl_bitmask_set (&bitmask, 5, TRUE);
+
+      verify_bits (&bitmask, 1, 4, 5, dummy_bit, -1);
+
+      _cogl_bitmask_set (&bitmask, 4, FALSE);
+
+      verify_bits (&bitmask, 1, 5, dummy_bit, -1);
+
+      _cogl_bitmask_clear_all (&bitmask);
+
+      verify_bits (&bitmask, -1);
+
+      if (dummy_bit != -1)
+        _cogl_bitmask_set (&bitmask, dummy_bit, TRUE);
+
+      verify_bits (&bitmask, dummy_bit, -1);
+
+      _cogl_bitmask_set (&bitmask, 1, TRUE);
+      _cogl_bitmask_set (&bitmask, 4, TRUE);
+      _cogl_bitmask_set (&bitmask, 5, TRUE);
+      _cogl_bitmask_set (&other_bitmask, 5, TRUE);
+      _cogl_bitmask_set (&other_bitmask, 6, TRUE);
+
+      _cogl_bitmask_set_bits (&bitmask, &other_bitmask);
+
+      verify_bits (&bitmask, 1, 4, 5, 6, dummy_bit, -1);
+      verify_bits (&other_bitmask, 5, 6, -1);
+
+      _cogl_bitmask_set (&bitmask, 6, FALSE);
+
+      verify_bits (&bitmask, 1, 4, 5, dummy_bit, -1);
+
+      _cogl_bitmask_xor_bits (&bitmask, &other_bitmask);
+
+      verify_bits (&bitmask, 1, 4, 6, dummy_bit, -1);
+      verify_bits (&other_bitmask, 5, 6, -1);
+
+      _cogl_bitmask_set_range (&bitmask, 5, TRUE);
+
+      verify_bits (&bitmask, 0, 1, 2, 3, 4, 6, dummy_bit, -1);
+
+      _cogl_bitmask_set_range (&bitmask, 4, FALSE);
+
+      verify_bits (&bitmask, 4, 6, dummy_bit, -1);
+
+      _cogl_bitmask_destroy (&other_bitmask);
+      _cogl_bitmask_destroy (&bitmask);
+    }
+
+  /* Extra tests for really long bitmasks */
+  _cogl_bitmask_init (&bitmask);
+  _cogl_bitmask_set_range (&bitmask, 400, TRUE);
+  _cogl_bitmask_init (&other_bitmask);
+  _cogl_bitmask_set (&other_bitmask, 5, TRUE);
+  _cogl_bitmask_xor_bits (&bitmask, &other_bitmask);
+
+  for (i = 0; i < 1024; i++)
+    {
+      g_assert_cmpint (_cogl_bitmask_get (&bitmask, i),
+                       ==,
+                       (i == 5 ? FALSE :
+                        i < 400 ? TRUE :
+                        FALSE));
+    }
+
+  _cogl_bitmask_set_range (&other_bitmask, 500, TRUE);
+  _cogl_bitmask_set_bits (&bitmask, &other_bitmask);
+
+  for (i = 0; i < 1024; i++)
+    g_assert_cmpint (_cogl_bitmask_get (&bitmask, i), ==, (i < 500));
+}
+
+COGL_TEST_SUITE_MINIMAL (
+  g_test_add_func ("/bitmask/api", check_bitmask_api);
+)