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-rw-r--r--test/caps-tails-curve.c127
1 files changed, 127 insertions, 0 deletions
diff --git a/test/caps-tails-curve.c b/test/caps-tails-curve.c
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+++ b/test/caps-tails-curve.c
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+/*
+ * Copyright © 2011 Intel Corporation
+ *
+ * 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.
+ *
+ * Author: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define LINE_WIDTH 30.
+#define SIZE (2 * LINE_WIDTH)
+#define PAD (2 * LINE_WIDTH)
+
+static void
+make_path (cairo_t *cr, double theta)
+{
+ double line_width = cairo_get_line_width (cr) / 4;
+
+ cairo_move_to (cr, 0, 0);
+ cairo_rel_curve_to (cr,
+ SIZE/3, -SIZE/4,
+ SIZE/3, -SIZE/4,
+ SIZE, 0);
+
+ cairo_rel_line_to (cr,
+ cos (theta) * line_width,
+ sin (theta) * line_width);
+}
+
+static void
+draw_joins (cairo_t *cr, double theta)
+{
+ make_path (cr, theta);
+ cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
+ cairo_stroke (cr);
+
+ cairo_translate (cr, SIZE + PAD, 0.);
+
+ make_path (cr, theta);
+ cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+ cairo_stroke (cr);
+
+ cairo_translate (cr, SIZE + PAD, 0.);
+
+ make_path (cr, theta);
+ cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
+ cairo_stroke (cr);
+
+ cairo_translate (cr, SIZE + PAD, 0.);
+}
+
+static void
+draw_caps_joins (cairo_t *cr, double theta)
+{
+ cairo_translate (cr, PAD, 0);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+ draw_joins (cr, theta);
+
+ cairo_translate (cr, PAD, 0);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+ draw_joins (cr, theta);
+
+ cairo_translate (cr, PAD, 0);
+ cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+ draw_joins (cr, theta);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ const double theta[] = {
+ -M_PI/2, -M_PI/4, 0, M_PI/8, M_PI/3, M_PI
+ };
+ unsigned int t;
+
+ /* We draw in the default black, so paint white first. */
+ cairo_save (cr);
+ cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
+ cairo_paint (cr);
+ cairo_restore (cr);
+
+ cairo_set_line_width (cr, LINE_WIDTH);
+
+ for (t = 0; t < ARRAY_LENGTH(theta); t++) {
+ cairo_save (cr);
+ cairo_translate (cr, 0, t * (SIZE + PAD) + PAD);
+ draw_caps_joins (cr, theta[t]);
+ cairo_restore (cr);
+
+ cairo_save (cr);
+ /* and reflect to generate the opposite vertex ordering */
+ cairo_translate (cr, 0, height - t * (SIZE + PAD) - PAD);
+ cairo_scale (cr, 1, -1);
+ draw_caps_joins (cr, theta[t]);
+ cairo_restore (cr);
+ }
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (caps_tails_curve,
+ "Test caps and joins on short tail segments",
+ "stroke, cap, join", /* keywords */
+ NULL, /* requirements */
+ 9 * (PAD + SIZE) + 4*PAD,
+ 12 * (PAD + SIZE) + PAD,
+ NULL, draw)
+