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Add another curve decomposition test

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This one uses GskPathMeasure to check that
our conic approximations look roughly right.
This commit is contained in:
Matthias Clasen
2023-07-08 13:51:18 -04:00
parent 1dd3986b03
commit 0582da02b3
1 changed files with 59 additions and 0 deletions
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59
testsuite/gsk/curve.c
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@@ -229,6 +229,64 @@ add_curve_to_array (GskPathOperation op,
return TRUE;
}
static void
test_curve_decompose_conic (void)
{
g_test_skip ("No good error bounds for decomposing conics");
return;
for (int i = 0; i < 100; i++)
{
GArray *array;
GskCurve c;
GskPathBuilder *builder;
GskPath *path;
GskPathMeasure *measure;
const graphene_point_t *s;
init_random_curve_with_op (&c, GSK_PATH_CONIC, GSK_PATH_CONIC);
builder = gsk_path_builder_new ();
s = gsk_curve_get_start_point (&c);
gsk_path_builder_move_to (builder, s->x, s->y);
gsk_curve_builder_to (&c, builder);
path = gsk_path_builder_free_to_path (builder);
measure = gsk_path_measure_new_with_tolerance (path, 0.1);
array = g_array_new (FALSE, FALSE, sizeof (GskCurve));
g_assert_true (gsk_curve_decompose_curve (&c, GSK_PATH_FOREACH_ALLOW_CUBIC, 0.1, add_curve_to_array, array));
g_assert_cmpint (array->len, >=, 1);
for (int j = 0; j < array->len; j++)
{
GskCurve *c2 = &g_array_index (array, GskCurve, j);
g_assert_true (c2->op == GSK_PATH_CUBIC);
/* Check that the curves we got are approximating the conic */
for (int k = 0; k < 11; k++)
{
GskPathPoint *point;
graphene_point_t p, q;
gsk_curve_get_point (c2, k/10.0, &p);
point = gsk_path_get_closest_point (path, &p, INFINITY);
gsk_path_point_get_position (point, &q);
g_assert_true (graphene_point_near (&p, &q, 0.5));
gsk_path_point_unref (point);
}
}
g_array_unref (array);
gsk_path_measure_unref (measure);
gsk_path_unref (path);
}
}
static void
test_curve_decompose_into (GskPathForeachFlags flags)
{
@@ -353,6 +411,7 @@ main (int argc, char *argv[])
g_test_add_func ("/curve/points", test_curve_points);
g_test_add_func ("/curve/tangents", test_curve_tangents);
g_test_add_func ("/curve/decompose", test_curve_decompose);
g_test_add_func ("/curve/decompose/conic", test_curve_decompose_conic);
g_test_add_func ("/curve/decompose/into/line", test_curve_decompose_into_line);
g_test_add_func ("/curve/decompose/into/quad", test_curve_decompose_into_quad);
g_test_add_func ("/curve/decompose/into/cubic", test_curve_decompose_into_cubic);