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+/* cc `pkg-config --cflags --libs cairo` cairo-spline-image.c -o cairo-spline-image */
+
+/* Copyright © 2005 Carl Worth
+ * Copyright © 2012 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.
+ */
+
+#include "cairo-test.h"
+
+#define WIDE_LINE_WIDTH 160
+#define NARROW_LINE_WIDTH 2
+
+/* A spline showing bugs in the "contour-based stroking" in cairo 1.12 */
+static const struct spline {
+ struct { double x, y; } pt[5];
+ double line_width;
+ double rgba[4];
+} splines[] = {
+ {
+ {
+ { 172.25, 156.185 },
+ { 177.225, 164.06 },
+ { 176.5, 157.5 },
+ { 175.5, 159.5 },
+ },
+ WIDE_LINE_WIDTH,
+ { 1, 1, 1, 1 },
+ },
+ {
+ {
+ { 571.25, 247.185 },
+ { 78.225, 224.06 },
+ { 129.5, 312.5 },
+ { 210.5, 224.5 },
+ },
+ NARROW_LINE_WIDTH,
+ { 1, 0, 0, 1 },
+ }
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+ unsigned n;
+
+ cairo_set_source_rgb (cr, 0, 0, 0);
+ cairo_paint (cr);
+
+ cairo_set_line_cap(cr, CAIRO_LINE_CAP_SQUARE);
+
+ for (n = 0; n < ARRAY_LENGTH(splines); n++) {
+ cairo_set_line_width (cr, splines[n].line_width);
+ cairo_set_source_rgba (cr,
+ splines[n].rgba[0],
+ splines[n].rgba[1],
+ splines[n].rgba[2],
+ splines[n].rgba[3]);
+
+ cairo_move_to (cr, splines[n].pt[0].x, splines[n].pt[0].y);
+ cairo_curve_to (cr,
+ splines[n].pt[1].x, splines[n].pt[1].y,
+ splines[n].pt[2].x, splines[n].pt[2].y,
+ splines[n].pt[3].x, splines[n].pt[3].y);
+
+ cairo_stroke (cr);
+ }
+
+ return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (bug_spline,
+ "Exercises a bug in the stroking of splines",
+ "spline, stroke", /* keywords */
+ NULL, /* requirements */
+ 300, 300,
+ NULL, draw)