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/*
* Copyright © 2021 Rick Yorgason
*
* 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"
/**
* draw:
* @cr: a #cairo_t
* @width: Width of the test image
* @height: Height of the test image
* @scale_width: Percentage to scale the width
* @scale_height: Percentage to scale the height
* @fit_to_scale: Whether or not to adjust the image to fit in the scale parameters
* regardless of the scale parameters
* @correct_scale: Tests if the hairlines render correctly regardless of
* whether or not the scale is set "correctly", as per
* https://cairographics.org/cookbook/ellipses/
static cairo_test_status_t
draw (cairo_t *cr, int width, int height, double scale_width, double scale_height, cairo_bool_t fit_to_scale, cairo_bool_t correct_scale)
{
cairo_matrix_t save_matrix;
double fit_width = fit_to_scale ? scale_width : 1.0;
double fit_height = fit_to_scale ? scale_height : 1.0;
double fit_max = MAX(fit_width, fit_height);
double dash[] = {3.0};
if (cairo_get_hairline (cr) == TRUE) {
return CAIRO_TEST_ERROR;
}
/* Clear background */
cairo_set_source_rgb (cr, 1, 1, 1);
cairo_paint (cr);
cairo_set_source_rgb (cr, 0, 0, 0);
cairo_set_line_width (cr, 100.0); /* If everything is working right, this value should never get used */
/* Hairline sample */
if (correct_scale) {
cairo_get_matrix (cr, &save_matrix);
cairo_scale (cr, scale_width, scale_height);
cairo_set_hairline (cr, TRUE);
if (cairo_get_hairline (cr) == FALSE) {
cairo_move_to (cr, 0, 0);
cairo_line_to (cr, width/fit_width/2, height/fit_height/2);
cairo_move_to (cr, width/fit_width/2, 0);
cairo_move_to (cr, 0, height/fit_height/2);
cairo_move_to (cr, width/fit_width/4, 0);
cairo_arc (cr, width/fit_width/2, height/fit_height/2, width/fit_max/4, M_PI*0.5, M_PI*1.0);
cairo_set_matrix (cr, &save_matrix);
cairo_stroke (cr);
/* Dashed sample */
cairo_set_dash (cr, dash, 1, 0);
cairo_arc (cr, width/fit_width/2, height/fit_height/2, width/fit_max/4, M_PI*1.0, M_PI*1.5);
/* Control sample */
cairo_set_line_width (cr, 3.0);
cairo_set_hairline (cr, FALSE);
cairo_set_dash (cr, 0, 0, 0);
cairo_move_to (cr, width/fit_width, height/fit_height);
cairo_move_to (cr, width/fit_width/2, height/fit_height);
cairo_move_to (cr, width/fit_width, height/fit_height/2);
cairo_move_to (cr, width/fit_width*0.75, height/fit_height);
cairo_arc (cr, width/fit_width/2, height/fit_height/2, width/fit_max/4, M_PI*1.5, M_PI*2.0);
cairo_arc (cr, width/fit_width/2, height/fit_height/2, width/fit_max/4, 0, M_PI*0.5);
return CAIRO_TEST_SUCCESS;
draw_typical (cairo_t *cr, int width, int height)
return draw (cr, width, height, 1.0, 1.0, TRUE, TRUE);
draw_scaled (cairo_t *cr, int width, int height)
return draw (cr, width, height, 0.5, 0.5, FALSE, TRUE);
draw_anisotropic (cairo_t *cr, int width, int height)
return draw (cr, width, height, 2.0, 5.0, TRUE, TRUE);
draw_anisotropic_incorrect (cairo_t *cr, int width, int height)
return draw (cr, width, height, 2.0, 5.0, TRUE, FALSE);
CAIRO_TEST (hairline,
"Tests hairlines are drawn at a single pixel width",
"path, stroke, hairline", /* keywords */
NULL, /* requirements */
49, 49,
NULL, draw_typical)
CAIRO_TEST (hairline_big,
99, 99,
CAIRO_TEST (hairline_scaled,
NULL, draw_scaled)
CAIRO_TEST (hairline_anisotropic,
"Tests hairlines with a really lopsided scale parameter",
NULL, draw_anisotropic)
CAIRO_TEST (hairline_anisotropic_incorrect,
NULL, draw_anisotropic_incorrect)