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109 lines
3.2 KiB
C
109 lines
3.2 KiB
C
/*
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* Author: Christian Rohlfs, 2022
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*
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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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*
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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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*
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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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{
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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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}
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static cairo_test_status_t
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draw_bevel(cairo_t *cr, int width, int height)
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{
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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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}
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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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