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Learning_GTK4_tree/testsuite/gsk/path.c

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2023-12-12 11:36:42 +01:00
/*
* Copyright © 2020 Benjamin Otte
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library. If not, see <http://www.gnu.org/licenses/>.
*
* Authors: Benjamin Otte <otte@gnome.org>
*/
#include <gtk/gtk.h>
#include "path-utils.h"
static GskPath *
create_random_degenerate_path (guint max_contours)
{
#define N_DEGENERATE_PATHS 15
GskPathBuilder *builder;
guint i;
builder = gsk_path_builder_new ();
switch (g_test_rand_int_range (0, N_DEGENERATE_PATHS))
{
case 0:
/* empty path */
break;
case 1:
/* a single point */
gsk_path_builder_move_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
break;
case 2:
/* N points */
for (i = 0; i < MIN (10, max_contours); i++)
{
gsk_path_builder_move_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
}
break;
case 3:
/* 1 closed point */
gsk_path_builder_move_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
gsk_path_builder_close (builder);
break;
case 4:
/* the same point closed N times */
gsk_path_builder_move_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
for (i = 0; i < MIN (10, max_contours); i++)
{
gsk_path_builder_close (builder);
}
break;
case 5:
/* a zero-width and zero-height rect */
gsk_path_builder_add_rect (builder,
&GRAPHENE_RECT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
0, 0));
break;
case 6:
/* a zero-width rect */
gsk_path_builder_add_rect (builder,
&GRAPHENE_RECT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
0,
g_test_rand_double_range (-1000, 1000)));
break;
case 7:
/* a zero-height rect */
gsk_path_builder_add_rect (builder,
&GRAPHENE_RECT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
0));
break;
case 8:
/* a negative-size rect */
gsk_path_builder_add_rect (builder,
&GRAPHENE_RECT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 0),
g_test_rand_double_range (-1000, 0)));
break;
case 9:
/* an absolutely random rect */
gsk_path_builder_add_rect (builder,
&GRAPHENE_RECT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000)));
break;
case 10:
/* an absolutely random rect */
gsk_path_builder_add_rect (builder,
&GRAPHENE_RECT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000)));
break;
case 11:
/* an absolutely random circle */
gsk_path_builder_add_circle (builder,
&GRAPHENE_POINT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000)),
g_test_rand_double_range (1, 1000));
break;
case 12:
/* circle with radius 0 */
gsk_path_builder_add_circle (builder,
&GRAPHENE_POINT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000)),
0);
break;
case 13:
/* a zero-length line */
{
graphene_point_t point = GRAPHENE_POINT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
gsk_path_builder_move_to (builder, point.x, point.y);
gsk_path_builder_line_to (builder, point.x, point.y);
}
break;
case 14:
/* a cubic with start == end */
{
graphene_point_t point = GRAPHENE_POINT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
gsk_path_builder_move_to (builder, point.x, point.y);
gsk_path_builder_cubic_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
point.x, point.y);
}
break;
case N_DEGENERATE_PATHS:
default:
g_assert_not_reached ();
}
return gsk_path_builder_free_to_path (builder);
}
static GskPath *
create_random_path (guint max_contours);
static void
add_shape_contour (GskPathBuilder *builder)
{
#define N_SHAPE_CONTOURS 3
switch (g_test_rand_int_range (0, N_SHAPE_CONTOURS))
{
case 0:
gsk_path_builder_add_rect (builder,
&GRAPHENE_RECT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (1, 1000),
g_test_rand_double_range (1, 1000)));
break;
case 1:
gsk_path_builder_add_circle (builder,
&GRAPHENE_POINT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000)),
g_test_rand_double_range (1, 1000));
break;
case 2:
{
GskPath *path = create_random_path (1);
gsk_path_builder_add_path (builder, path);
gsk_path_unref (path);
}
break;
case N_SHAPE_CONTOURS:
default:
g_assert_not_reached ();
break;
}
}
static void
add_standard_contour (GskPathBuilder *builder)
{
guint i, n;
if (g_test_rand_bit ())
{
if (g_test_rand_bit ())
gsk_path_builder_move_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
else
gsk_path_builder_rel_move_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
}
/* that 20 is random, but should be enough to get some
* crazy self-intersecting shapes */
n = g_test_rand_int_range (1, 20);
for (i = 0; i < n; i++)
{
switch (g_test_rand_int_range (0, 8))
{
case 0:
gsk_path_builder_line_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
break;
case 1:
gsk_path_builder_rel_line_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
break;
case 2:
gsk_path_builder_quad_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
break;
case 3:
gsk_path_builder_rel_quad_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
break;
case 4:
gsk_path_builder_cubic_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
break;
case 5:
gsk_path_builder_rel_cubic_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
break;
case 6:
gsk_path_builder_conic_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (0.2, 20));
break;
case 7:
gsk_path_builder_rel_conic_to (builder,
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (0.2, 20));
break;
default:
g_assert_not_reached();
break;
}
}
if (g_test_rand_bit ())
gsk_path_builder_close (builder);
}
static GskPath *
create_random_path (guint max_contours)
{
GskPathBuilder *builder;
guint i, n;
/* 5% chance for a weird shape */
if (!g_test_rand_int_range (0, 20))
return create_random_degenerate_path (max_contours);
builder = gsk_path_builder_new ();
n = g_test_rand_int_range (1, 10);
n = MIN (n, max_contours);
for (i = 0; i < n; i++)
{
/* 2/3 of shapes are standard contours */
if (g_test_rand_int_range (0, 3))
add_standard_contour (builder);
else
add_shape_contour (builder);
}
return gsk_path_builder_free_to_path (builder);
}
static void
test_create (void)
{
GskPath *path1, *path2, *built;
GskPathBuilder *builder;
guint i;
char *s;
GString *str;
for (i = 0; i < 1000; i++)
{
builder = gsk_path_builder_new ();
path1 = create_random_path (G_MAXUINT);
gsk_path_builder_add_path (builder, path1);
path2 = create_random_path (G_MAXUINT);
gsk_path_builder_add_path (builder, path2);
built = gsk_path_builder_free_to_path (builder);
str = g_string_new (NULL);
gsk_path_print (path1, str);
if (!gsk_path_is_empty (path1) && !gsk_path_is_empty (path2))
g_string_append_c (str, ' ');
gsk_path_print (path2, str);
s = gsk_path_to_string (built);
g_assert_cmpstr (s, ==, str->str);
g_string_free (str, TRUE);
g_free (s);
gsk_path_unref (built);
gsk_path_unref (path2);
gsk_path_unref (path1);
}
}
static void
test_parse (void)
{
int i;
for (i = 0; i < 1000; i++)
{
GskPath *path1, *path2;
char *string1, *string2;
path1 = create_random_path (G_MAXUINT);
string1 = gsk_path_to_string (path1);
g_assert_nonnull (string1);
path2 = gsk_path_parse (string1);
g_assert_nonnull (path2);
string2 = gsk_path_to_string (path2);
g_assert_nonnull (string2);
assert_path_equal_with_epsilon (path1, path2, 1.f / 1024);
gsk_path_unref (path2);
gsk_path_unref (path1);
g_free (string2);
g_free (string1);
}
}
#define N_PATHS 3
static void
test_in_fill_union (void)
{
GskPath *path, *paths[N_PATHS];
GskPathBuilder *builder;
guint i, j, k;
for (i = 0; i < 100; i++)
{
builder = gsk_path_builder_new ();
for (k = 0; k < N_PATHS; k++)
{
paths[k] = create_random_path (G_MAXUINT);
gsk_path_builder_add_path (builder, paths[k]);
}
path = gsk_path_builder_free_to_path (builder);
for (j = 0; j < 100; j++)
{
graphene_point_t test = GRAPHENE_POINT_INIT (g_test_rand_double_range (-1000, 1000),
g_test_rand_double_range (-1000, 1000));
GskFillRule fill_rule;
for (fill_rule = GSK_FILL_RULE_WINDING; fill_rule <= GSK_FILL_RULE_EVEN_ODD; fill_rule++)
{
guint n_in_fill = 0;
gboolean in_fill;
for (k = 0; k < N_PATHS; k++)
{
if (gsk_path_in_fill (paths[k], &test, GSK_FILL_RULE_EVEN_ODD))
n_in_fill++;
}
in_fill = gsk_path_in_fill (path, &test, GSK_FILL_RULE_EVEN_ODD);
switch (fill_rule)
{
case GSK_FILL_RULE_WINDING:
if (n_in_fill == 0)
g_assert_false (in_fill);
else if (n_in_fill == 1)
g_assert_true (in_fill);
/* else we can't say anything because the winding rule doesn't give enough info */
break;
case GSK_FILL_RULE_EVEN_ODD:
g_assert_cmpint (in_fill, ==, n_in_fill & 1);
break;
default:
g_assert_not_reached ();
break;
}
}
}
gsk_path_unref (path);
for (k = 0; k < N_PATHS; k++)
gsk_path_unref (paths[k]);
}
}
#undef N_PATHS
/* This is somewhat sucky because using foreach breaks up the contours
* (like rects and circles) and replaces everything with the standard
* contour.
* But at least it extensively tests the standard contour.
*/
static gboolean
rotate_path_cb (GskPathOperation op,
const graphene_point_t *pts,
gsize n_pts,
float weight,
gpointer user_data)
{
GskPathBuilder **builders = user_data;
switch (op)
{
case GSK_PATH_MOVE:
gsk_path_builder_move_to (builders[0], pts[0].x, pts[0].y);
gsk_path_builder_move_to (builders[1], pts[0].y, -pts[0].x);
break;
case GSK_PATH_CLOSE:
gsk_path_builder_close (builders[0]);
gsk_path_builder_close (builders[1]);
break;
case GSK_PATH_LINE:
gsk_path_builder_line_to (builders[0], pts[1].x, pts[1].y);
gsk_path_builder_line_to (builders[1], pts[1].y, -pts[1].x);
break;
case GSK_PATH_QUAD:
gsk_path_builder_quad_to (builders[0], pts[1].x, pts[1].y, pts[2].x, pts[2].y);
gsk_path_builder_quad_to (builders[1], pts[1].y, -pts[1].x, pts[2].y, -pts[2].x);
break;
case GSK_PATH_CUBIC:
gsk_path_builder_cubic_to (builders[0], pts[1].x, pts[1].y, pts[2].x, pts[2].y, pts[3].x, pts[3].y);
gsk_path_builder_cubic_to (builders[1], pts[1].y, -pts[1].x, pts[2].y, -pts[2].x, pts[3].y, -pts[3].x);
break;
case GSK_PATH_CONIC:
gsk_path_builder_conic_to (builders[0], pts[1].x, pts[1].y, pts[2].x, pts[2].y, weight);
gsk_path_builder_conic_to (builders[1], pts[1].y, -pts[1].x, pts[2].y, -pts[2].x, weight);
break;
default:
g_assert_not_reached ();
return FALSE;
}
return TRUE;
}
static void
test_in_fill_rotated (void)
{
GskPath *path;
GskPathBuilder *builders[2];
GskPath *paths[2];
guint i, j;
#define N_FILL_RULES 2
/* if this triggers, you added a new enum value to GskFillRule, so the define above needs
* an update */
g_assert_null (g_enum_get_value (g_type_class_ref (GSK_TYPE_FILL_RULE), N_FILL_RULES));
for (i = 0; i < 100; i++)
{
path = create_random_path (G_MAXUINT);
builders[0] = gsk_path_builder_new ();
builders[1] = gsk_path_builder_new ();
/* Use -1 here because we want all the flags, even future additions */
gsk_path_foreach (path, -1, rotate_path_cb, builders);
gsk_path_unref (path);
paths[0] = gsk_path_builder_free_to_path (builders[0]);
paths[1] = gsk_path_builder_free_to_path (builders[1]);
for (j = 0; j < 100; j++)
{
GskFillRule fill_rule = g_random_int_range (0, N_FILL_RULES);
float x = g_test_rand_double_range (-1000, 1000);
float y = g_test_rand_double_range (-1000, 1000);
g_assert_cmpint (gsk_path_in_fill (paths[0], &GRAPHENE_POINT_INIT (x, y), fill_rule),
==,
gsk_path_in_fill (paths[1], &GRAPHENE_POINT_INIT (y, -x), fill_rule));
g_assert_cmpint (gsk_path_in_fill (paths[0], &GRAPHENE_POINT_INIT (y, x), fill_rule),
==,
gsk_path_in_fill (paths[1], &GRAPHENE_POINT_INIT (x, -y), fill_rule));
}
gsk_path_unref (paths[0]);
gsk_path_unref (paths[1]);
}
#undef N_FILL_RULES
}
static void
test_split (void)
{
GskPath *path, *path1, *path2;
GskPathMeasure *measure, *measure1, *measure2;
float length, length1, length2;
GskPathBuilder *builder;
float split, epsilon;
GskPathPoint point0, point1, point2;
float tolerance = 0.5;
for (int i = 0; i < 100; i++)
{
if (g_test_verbose ())
g_test_message ("path %u", i);
path = create_random_path (1);
measure = gsk_path_measure_new_with_tolerance (path, tolerance);
length = gsk_path_measure_get_length (measure);
/* chosen high enough to stop the testsuite from failing */
epsilon = MAX (length / 250, 1.f / 1024);
split = g_test_rand_double_range (0, length);
if (!gsk_path_get_start_point (path, &point0) ||
!gsk_path_measure_get_point (measure, split, &point1) ||
!gsk_path_get_end_point (path, &point2))
{
gsk_path_unref (path);
gsk_path_measure_unref (measure);
continue;
}
if (gsk_path_point_equal (&point0, &point1) ||
gsk_path_point_equal (&point1, &point2))
{
gsk_path_unref (path);
gsk_path_measure_unref (measure);
continue;
}
g_assert_true (gsk_path_point_compare (&point0, &point1) < 0);
g_assert_true (gsk_path_point_compare (&point1, &point2) < 0);
builder = gsk_path_builder_new ();
gsk_path_builder_add_segment (builder, path, &point0, &point1);
path1 = gsk_path_builder_free_to_path (builder);
measure1 = gsk_path_measure_new_with_tolerance (path1, tolerance);
length1 = gsk_path_measure_get_length (measure1);
builder = gsk_path_builder_new ();
gsk_path_builder_add_segment (builder, path, &point1, &point2);
path2 = gsk_path_builder_free_to_path (builder);
measure2 = gsk_path_measure_new_with_tolerance (path2, tolerance);
length2 = gsk_path_measure_get_length (measure2);
g_assert_cmpfloat_with_epsilon (length, length1 + length2, epsilon);
gsk_path_unref (path2);
gsk_path_unref (path1);
gsk_path_unref (path);
gsk_path_measure_unref (measure2);
gsk_path_measure_unref (measure1);
gsk_path_measure_unref (measure);
}
}
static void
test_roundtrip (void)
{
GskPath *path;
GskPathMeasure *measure;
float length;
float split, epsilon;
GskPathPoint point;
float distance;
float tolerance = 0.5;
for (int i = 0; i < 100; i++)
{
if (g_test_verbose ())
g_test_message ("path %u", i);
path = create_random_path (1);
measure = gsk_path_measure_new_with_tolerance (path, tolerance);
length = gsk_path_measure_get_length (measure);
/* chosen high enough to stop the testsuite from failing */
epsilon = MAX (length / 1000, 1.f / 1024);
split = g_test_rand_double_range (0, length);
if (!gsk_path_measure_get_point (measure, split, &point))
{
gsk_path_unref (path);
gsk_path_measure_unref (measure);
continue;
}
distance = gsk_path_point_get_distance (&point, measure);
g_assert_cmpfloat_with_epsilon (split, distance, epsilon);
gsk_path_unref (path);
gsk_path_measure_unref (measure);
}
}
static void
test_segment (void)
{
GskPath *path, *path1, *path2, *path3;
GskPathMeasure *measure, *measure1, *measure2, *measure3;
GskPathPoint point0, point1, point2, point3;
float length, length1, length2, length3;
GskPathBuilder *builder;
float split1, split2, epsilon;
float tolerance = 0.5;
for (int i = 0; i < 100; i++)
{
if (g_test_verbose ())
g_test_message ("path %u", i);
path = create_random_path (G_MAXUINT);
measure = gsk_path_measure_new_with_tolerance (path, tolerance);
length = gsk_path_measure_get_length (measure);
/* We are accumulating both the split error and the roundtrip error
* here (on both ends, for the middle segment). So we should expect
* the epsilon here to be at least 4 times the epsilon we can use
* in the split and roundtrip tests.
*/
epsilon = MAX (length / 200, 1.f / 1024);
split1 = g_test_rand_double_range (0, length);
split2 = g_test_rand_double_range (split1, length);
if (!gsk_path_get_start_point (path, &point0) ||
!gsk_path_measure_get_point (measure, split1, &point1) ||
!gsk_path_measure_get_point (measure, split2, &point2) ||
!gsk_path_get_end_point (path, &point3))
{
gsk_path_unref (path);
gsk_path_measure_unref (measure);
continue;
}
if (gsk_path_point_equal (&point0, &point1) ||
gsk_path_point_equal (&point1, &point2) ||
gsk_path_point_equal (&point2, &point3))
{
gsk_path_unref (path);
gsk_path_measure_unref (measure);
continue;
}
builder = gsk_path_builder_new ();
gsk_path_builder_add_segment (builder, path, &point0, &point1);
path1 = gsk_path_builder_free_to_path (builder);
measure1 = gsk_path_measure_new_with_tolerance (path1, tolerance);
length1 = gsk_path_measure_get_length (measure1);
builder = gsk_path_builder_new ();
gsk_path_builder_add_segment (builder, path, &point1, &point2);
path2 = gsk_path_builder_free_to_path (builder);
measure2 = gsk_path_measure_new_with_tolerance (path2, tolerance);
length2 = gsk_path_measure_get_length (measure2);
builder = gsk_path_builder_new ();
gsk_path_builder_add_segment (builder, path, &point2, &point3);
path3 = gsk_path_builder_free_to_path (builder);
measure3 = gsk_path_measure_new_with_tolerance (path3, tolerance);
length3 = gsk_path_measure_get_length (measure3);
g_assert_cmpfloat_with_epsilon (split1, length1, epsilon);
g_assert_cmpfloat_with_epsilon (split2, length1 + length2, epsilon);
g_assert_cmpfloat_with_epsilon (length, length1 + length2 + length3, epsilon);
gsk_path_unref (path3);
gsk_path_unref (path2);
gsk_path_unref (path1);
gsk_path_unref (path);
gsk_path_measure_unref (measure3);
gsk_path_measure_unref (measure2);
gsk_path_measure_unref (measure1);
gsk_path_measure_unref (measure);
}
}
int
main (int argc,
char *argv[])
{
gtk_test_init (&argc, &argv, NULL);
g_test_add_func ("/path/create", test_create);
g_test_add_func ("/path/parse", test_parse);
g_test_add_func ("/path/in-fill-union", test_in_fill_union);
g_test_add_func ("/path/in-fill-rotated", test_in_fill_rotated);
g_test_add_func ("/path/measure/split", test_split);
g_test_add_func ("/path/measure/roundtrip", test_roundtrip);
g_test_add_func ("/path/measure/segment", test_segment);
return g_test_run ();
}