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3424e91ec7
Are the reference images correct? Discuss. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
127 lines
3.5 KiB
C
127 lines
3.5 KiB
C
/*
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* Copyright © 2011 Intel Corporation
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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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* Author: Chris Wilson <chris@chris-wilson.co.uk>
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*/
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#include "cairo-test.h"
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#define LINE_WIDTH 30.
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#define SIZE (2 * LINE_WIDTH)
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#define PAD (2 * LINE_WIDTH)
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static void
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make_path (cairo_t *cr, double theta)
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{
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double line_width = cairo_get_line_width (cr) / 4;
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cairo_move_to (cr, 0, 0);
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cairo_rel_curve_to (cr,
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SIZE/3, -SIZE/4,
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SIZE/3, -SIZE/4,
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SIZE, 0);
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cairo_rel_line_to (cr,
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cos (theta) * line_width,
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sin (theta) * line_width);
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}
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static void
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draw_joins (cairo_t *cr, double theta)
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{
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make_path (cr, theta);
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cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
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cairo_stroke (cr);
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cairo_translate (cr, SIZE + PAD, 0.);
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make_path (cr, theta);
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cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
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cairo_stroke (cr);
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cairo_translate (cr, SIZE + PAD, 0.);
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make_path (cr, theta);
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cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
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cairo_stroke (cr);
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cairo_translate (cr, SIZE + PAD, 0.);
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}
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static void
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draw_caps_joins (cairo_t *cr, double theta)
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{
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cairo_translate (cr, PAD, 0);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
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draw_joins (cr, theta);
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cairo_translate (cr, PAD, 0);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
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draw_joins (cr, theta);
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cairo_translate (cr, PAD, 0);
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cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
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draw_joins (cr, theta);
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}
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static cairo_test_status_t
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draw (cairo_t *cr, int width, int height)
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{
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const double theta[] = {
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-M_PI/2, -M_PI/4, 0, M_PI/8, M_PI/3, M_PI
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};
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unsigned int t;
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/* We draw in the default black, so paint white first. */
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cairo_save (cr);
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cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
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cairo_paint (cr);
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cairo_restore (cr);
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cairo_set_line_width (cr, LINE_WIDTH);
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for (t = 0; t < sizeof(theta)/sizeof (theta[0]); t++) {
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cairo_save (cr);
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cairo_translate (cr, 0, t * (SIZE + PAD) + PAD);
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draw_caps_joins (cr, theta[t]);
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cairo_restore (cr);
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cairo_save (cr);
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/* and reflect to generate the opposite vertex ordering */
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cairo_translate (cr, 0, height - t * (SIZE + PAD) - PAD);
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cairo_scale (cr, 1, -1);
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draw_caps_joins (cr, theta[t]);
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cairo_restore (cr);
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}
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return CAIRO_TEST_SUCCESS;
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}
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CAIRO_TEST (caps_tails_curve,
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"Test caps and joins on short tail segments",
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"stroke cap join", /* keywords */
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NULL, /* requirements */
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9 * (PAD + SIZE) + 4*PAD,
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12 * (PAD + SIZE) + PAD,
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NULL, draw)
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