Grcov report - round-join-bug-520.c

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/*

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 * Author: Christian Rohlfs, 2022

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 * Permission is hereby granted, free of charge, to any person

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 * obtaining a copy of this software and associated documentation

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 * files (the "Software"), to deal in the Software without

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 * restriction, including without limitation the rights to use, copy,

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 * modify, merge, publish, distribute, sublicense, and/or sell copies

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 * of the Software, and to permit persons to whom the Software is

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 * furnished to do so, subject to the following conditions:

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 * The above copyright notice and this permission notice shall be

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 * included in all copies or substantial portions of the Software.

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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

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 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

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 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

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 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS

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 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN

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 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN

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 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

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 * SOFTWARE.

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*/

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#include "cairo-test.h"

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#define WIDTH   100

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#define HEIGHT  WIDTH

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static cairo_test_status_t

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draw_round(cairo_t *cr, int width, int height)

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    /* Fail condition:

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            0  >=  2 * ( 1 - tolerance / (line_width / 2) )^2 - 1,

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       with the default tolerance of 0.1, `failing_line_width` is in

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            [0.117157287525381; 0.682842712474619]

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       range.

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*/

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    double failing_line_width = 0.3;

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    cairo_set_tolerance(cr, 0.1);

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    cairo_scale(cr, width, height);

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    cairo_set_source_rgb(cr, 1, 1, 1);

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    cairo_paint(cr);

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    cairo_move_to(cr, 0.2, 0.2);

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    cairo_line_to(cr, 0.8, 0.2);

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    cairo_line_to(cr, 0.8, 0.8);

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    cairo_line_to(cr, 0.2, 0.8);

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    cairo_close_path(cr);

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    cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);

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    cairo_set_source_rgb(cr, 0, 0, 0);

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    cairo_set_line_width(cr, failing_line_width);

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    cairo_stroke(cr);

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    return CAIRO_TEST_SUCCESS;

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static cairo_test_status_t

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3

draw_bevel(cairo_t *cr, int width, int height)

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    /* Fail condition:

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            arc_height < tolerance

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       For 90° join `arc_height` is equal to

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            line_width / 2 * (1 - sqrt(1/2))

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       which is 0.1464466094067262 of a `line_width`.

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*/

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    double line_width = 0.3;

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    double failing_tolerance = 0.3 * line_width;

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    cairo_set_tolerance(cr, width * failing_tolerance);

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    cairo_scale(cr, width, height);

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    cairo_set_source_rgb(cr, 1, 1, 1);

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    cairo_paint(cr);

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    cairo_move_to(cr, 0.2, 0.2);

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    cairo_line_to(cr, 0.8, 0.2);

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    cairo_line_to(cr, 0.8, 0.8);

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    cairo_line_to(cr, 0.2, 0.8);

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    cairo_close_path(cr);

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    cairo_set_line_join(cr, CAIRO_LINE_JOIN_ROUND);

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    cairo_set_source_rgb(cr, 0, 0, 0);

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    cairo_set_line_width(cr, line_width);

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    cairo_stroke(cr);

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    return CAIRO_TEST_SUCCESS;

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CAIRO_TEST (round_join_bug_520_round,

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    "Tests round joins within tolerance",

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    "stroke, cap, join", /* keywords */

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    NULL, /* requirements */

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    WIDTH, HEIGHT,

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    NULL, draw_round)

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CAIRO_TEST (round_join_bug_520_bevel,

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    "Tests round joins omission when `arc_height < tolerance`",

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    "stroke, cap, join", /* keywords */

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    NULL, /* requirements */

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    WIDTH, HEIGHT,

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    NULL, draw_bevel)

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