[gtk/curve-ops: 101/109] Add conic decomposition tests
- From: Matthias Clasen <matthiasc src gnome org>
- To: commits-list gnome org
- Cc:
- Subject: [gtk/curve-ops: 101/109] Add conic decomposition tests
- Date: Sat, 26 Dec 2020 16:49:30 +0000 (UTC)
commit b26557c856cfdddff793994ee39b82cda6d2301f
Author: Matthias Clasen <mclasen redhat com>
Date: Wed Dec 9 19:11:41 2020 -0500
Add conic decomposition tests
We don't have good error bounds here, unfortunately.
testsuite/gsk/curve.c | 79 +++++++++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 77 insertions(+), 2 deletions(-)
---
diff --git a/testsuite/gsk/curve.c b/testsuite/gsk/curve.c
index f888da5b17..5b5af1fadd 100644
--- a/testsuite/gsk/curve.c
+++ b/testsuite/gsk/curve.c
@@ -18,9 +18,11 @@ random_weight (void)
}
static void
-init_random_curve (GskCurve *curve)
+init_random_curve_with_op (GskCurve *curve,
+ GskPathOperation min_op,
+ GskPathOperation max_op)
{
- switch (g_test_rand_int_range (GSK_PATH_LINE, GSK_PATH_CONIC + 1))
+ switch (g_test_rand_int_range (min_op, max_op + 1))
{
case GSK_PATH_LINE:
{
@@ -61,6 +63,12 @@ init_random_curve (GskCurve *curve)
}
}
+static void
+init_random_curve (GskCurve *curve)
+{
+ init_random_curve_with_op (curve, GSK_PATH_LINE, GSK_PATH_CONIC);
+}
+
static void
test_curve_tangents (void)
{
@@ -191,6 +199,72 @@ test_curve_decompose (void)
}
}
+static gboolean
+add_curve_to_array (const graphene_point_t points[4],
+ gpointer user_data)
+{
+ GArray *array = user_data;
+ GskCurve c;
+
+ gsk_curve_init (&c, gsk_pathop_encode (GSK_PATH_CURVE, points));
+ g_array_append_val (array, c);
+
+ return TRUE;
+}
+
+static void
+test_curve_decompose_curve (void)
+{
+ 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, 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_CURVE);
+
+ /* Check that the curves we got are approximating the conic */
+ for (int k = 0; k < 11; k++)
+ {
+ graphene_point_t p;
+ float dist;
+
+ gsk_curve_get_point (c2, k/10.0, &p);
+ dist = gsk_path_measure_get_closest_point (measure, &p, NULL);
+ g_assert_cmpfloat (dist, <, 0.5); // FIXME error bound ?
+ }
+ }
+
+ g_array_unref (array);
+
+ gsk_path_measure_unref (measure);
+ gsk_path_unref (path);
+ }
+}
+
static void
test_line_line_intersection (void)
{
@@ -399,6 +473,7 @@ 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-curve", test_curve_decompose_curve);
g_test_add_func ("/curve/intersection/line-line", test_line_line_intersection);
g_test_add_func ("/curve/intersection/line-curve", test_line_curve_intersection);
g_test_add_func ("/curve/intersection/curve-curve", test_curve_curve_intersection);
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