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/*
* Author: Christian Rohlfs, 2022
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use, copy,
* modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include "cairo-test.h"
#define WIDTH 100
#define HEIGHT WIDTH
static cairo_test_status_t
draw_round(cairo_t *cr, int width, int height)
{
/* Fail condition:
0 >= 2 * ( 1 - tolerance / (line_width / 2) )^2 - 1,
with the default tolerance of 0.1, `failing_line_width` is in
[0.117157287525381; 0.682842712474619]
range.
*/
double failing_line_width = 0.3;
cairo_set_tolerance(cr, 0.1);
cairo_scale(cr, width, height);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_paint(cr);
cairo_move_to(cr, 0.2, 0.2);
cairo_line_to(cr, 0.8, 0.2);
cairo_line_to(cr, 0.8, 0.8);
cairo_line_to(cr, 0.2, 0.8);
cairo_close_path(cr);
cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_set_line_width(cr, failing_line_width);
cairo_stroke(cr);
return CAIRO_TEST_SUCCESS;
}
static cairo_test_status_t
draw_bevel(cairo_t *cr, int width, int height)
{
/* Fail condition:
arc_height < tolerance
For 90° join `arc_height` is equal to
line_width / 2 * (1 - sqrt(1/2))
which is 0.1464466094067262 of a `line_width`.
*/
double line_width = 0.3;
double failing_tolerance = 0.3 * line_width;
cairo_set_tolerance(cr, width * failing_tolerance);
cairo_scale(cr, width, height);
cairo_set_source_rgb(cr, 1, 1, 1);
cairo_paint(cr);
cairo_move_to(cr, 0.2, 0.2);
cairo_line_to(cr, 0.8, 0.2);
cairo_line_to(cr, 0.8, 0.8);
cairo_line_to(cr, 0.2, 0.8);
cairo_close_path(cr);
cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);
cairo_set_source_rgb(cr, 0, 0, 0);
cairo_set_line_width(cr, line_width);
cairo_stroke(cr);
return CAIRO_TEST_SUCCESS;
}
CAIRO_TEST (round_join_bug_520_round,
"Tests round joins within tolerance",
"stroke, cap, join", /* keywords */
NULL, /* requirements */
WIDTH, HEIGHT,
NULL, draw_round)
CAIRO_TEST (round_join_bug_520_bevel,
"Tests round joins omission when `arc_height < tolerance`",
"stroke, cap, join", /* keywords */
NULL, /* requirements */
WIDTH, HEIGHT,
NULL, draw_bevel)
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