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Add randomized measure tests
Test that lengths behave as expected when we split paths, do roundtrips through points, and subset paths.
This commit is contained in:
Matthias Clasen
parent
46a8f57735
commit
2097b15f9c
@ -780,6 +780,217 @@ test_in_fill_rotated (void)
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#undef N_FILL_RULES
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}
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static void
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test_split (void)
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{
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GskPath *path, *path1, *path2;
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GskPathMeasure *measure, *measure1, *measure2;
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float length, length1, length2;
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GskPathBuilder *builder;
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float split, epsilon;
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GskPathPoint point0, point1, point2;
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float tolerance = 0.5;
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if (!g_test_slow ())
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{
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g_test_skip ("Skipping slow test");
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return;
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}
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for (int i = 0; i < 100; i++)
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{
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if (g_test_verbose ())
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g_test_message ("path %u", i);
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path = create_random_path (G_MAXUINT);
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measure = gsk_path_measure_new_with_tolerance (path, tolerance);
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length = gsk_path_measure_get_length (measure);
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/* chosen high enough to stop the testsuite from failing */
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epsilon = MAX (length / 1000, 1.f / 1024);
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split = g_test_rand_double_range (0, length);
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if (!gsk_path_get_start_point (path, &point0) ||
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!gsk_path_measure_get_point (measure, split, &point1) ||
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!gsk_path_get_end_point (path, &point2))
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{
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gsk_path_unref (path);
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gsk_path_measure_unref (measure);
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continue;
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}
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if (gsk_path_point_equal (&point0, &point1) ||
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gsk_path_point_equal (&point1, &point2))
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{
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gsk_path_unref (path);
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gsk_path_measure_unref (measure);
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continue;
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}
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g_assert_true (gsk_path_point_compare (&point0, &point1) < 0);
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g_assert_true (gsk_path_point_compare (&point1, &point2) < 0);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_segment (builder, path, &point0, &point1);
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path1 = gsk_path_builder_free_to_path (builder);
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measure1 = gsk_path_measure_new_with_tolerance (path1, tolerance);
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length1 = gsk_path_measure_get_length (measure1);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_segment (builder, path, &point1, &point2);
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path2 = gsk_path_builder_free_to_path (builder);
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measure2 = gsk_path_measure_new_with_tolerance (path2, tolerance);
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length2 = gsk_path_measure_get_length (measure2);
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g_assert_cmpfloat_with_epsilon (length, length1 + length2, epsilon);
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gsk_path_unref (path2);
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gsk_path_unref (path1);
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gsk_path_unref (path);
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gsk_path_measure_unref (measure2);
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gsk_path_measure_unref (measure1);
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gsk_path_measure_unref (measure);
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}
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}
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static void
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test_roundtrip (void)
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{
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GskPath *path;
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GskPathMeasure *measure;
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float length;
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float split, epsilon;
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GskPathPoint point;
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float distance;
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float tolerance = 0.5;
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if (!g_test_slow ())
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{
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g_test_skip ("Skipping slow test");
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return;
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}
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for (int i = 0; i < 100; i++)
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{
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if (g_test_verbose ())
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g_test_message ("path %u", i);
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path = create_random_path (G_MAXUINT);
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measure = gsk_path_measure_new_with_tolerance (path, tolerance);
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length = gsk_path_measure_get_length (measure);
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/* chosen high enough to stop the testsuite from failing */
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epsilon = MAX (length / 1000, 1.f / 1024);
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split = g_test_rand_double_range (0, length);
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if (!gsk_path_measure_get_point (measure, split, &point))
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{
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gsk_path_unref (path);
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gsk_path_measure_unref (measure);
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continue;
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}
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distance = gsk_path_point_get_distance (&point, measure);
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g_assert_cmpfloat_with_epsilon (split, distance, epsilon);
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gsk_path_unref (path);
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gsk_path_measure_unref (measure);
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}
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}
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static void
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test_segment (void)
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{
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GskPath *path, *path1, *path2, *path3;
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GskPathMeasure *measure, *measure1, *measure2, *measure3;
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GskPathPoint point0, point1, point2, point3;
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float length, length1, length2, length3;
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GskPathBuilder *builder;
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float split1, split2, epsilon;
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float tolerance = 0.5;
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if (!g_test_slow ())
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{
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g_test_skip ("Skipping slow test");
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return;
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}
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for (int i = 0; i < 100; i++)
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{
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if (g_test_verbose ())
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g_test_message ("path %u", i);
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path = create_random_path (G_MAXUINT);
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measure = gsk_path_measure_new_with_tolerance (path, tolerance);
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length = gsk_path_measure_get_length (measure);
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/* We are accumulating both the split error and the roundtrip error
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* here (on both ends, for the middle segment). So we should expect
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* the epsilon here to be at least 4 times the epsilon we can use
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* in the split and roundtrip tests.
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*/
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epsilon = MAX (length / 200, 1.f / 1024);
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split1 = g_test_rand_double_range (0, length);
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split2 = g_test_rand_double_range (split1, length);
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if (!gsk_path_get_start_point (path, &point0) ||
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!gsk_path_measure_get_point (measure, split1, &point1) ||
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!gsk_path_measure_get_point (measure, split2, &point2) ||
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!gsk_path_get_end_point (path, &point3))
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{
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gsk_path_unref (path);
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gsk_path_measure_unref (measure);
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continue;
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}
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if (gsk_path_point_equal (&point0, &point1) ||
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gsk_path_point_equal (&point1, &point2) ||
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gsk_path_point_equal (&point2, &point3))
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{
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gsk_path_unref (path);
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gsk_path_measure_unref (measure);
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continue;
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}
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_segment (builder, path, &point0, &point1);
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path1 = gsk_path_builder_free_to_path (builder);
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measure1 = gsk_path_measure_new_with_tolerance (path1, tolerance);
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length1 = gsk_path_measure_get_length (measure1);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_segment (builder, path, &point1, &point2);
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path2 = gsk_path_builder_free_to_path (builder);
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measure2 = gsk_path_measure_new_with_tolerance (path2, tolerance);
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length2 = gsk_path_measure_get_length (measure2);
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builder = gsk_path_builder_new ();
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gsk_path_builder_add_segment (builder, path, &point2, &point3);
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path3 = gsk_path_builder_free_to_path (builder);
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measure3 = gsk_path_measure_new_with_tolerance (path3, tolerance);
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length3 = gsk_path_measure_get_length (measure3);
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g_assert_cmpfloat_with_epsilon (split1, length1, epsilon);
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g_assert_cmpfloat_with_epsilon (split2, length1 + length2, epsilon);
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g_assert_cmpfloat_with_epsilon (length, length1 + length2 + length3, epsilon);
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gsk_path_unref (path3);
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gsk_path_unref (path2);
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gsk_path_unref (path1);
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gsk_path_unref (path);
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gsk_path_measure_unref (measure3);
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gsk_path_measure_unref (measure2);
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gsk_path_measure_unref (measure1);
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gsk_path_measure_unref (measure);
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}
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}
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int
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main (int argc,
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char *argv[])
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@ -790,6 +1001,9 @@ main (int argc,
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g_test_add_func ("/path/parse", test_parse);
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g_test_add_func ("/path/in-fill-union", test_in_fill_union);
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g_test_add_func ("/path/in-fill-rotated", test_in_fill_rotated);
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g_test_add_func ("/path/measure/split", test_split);
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g_test_add_func ("/path/measure/roundtrip", test_roundtrip);
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g_test_add_func ("/path/measure/segment", test_segment);
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return g_test_run ();
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}
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