1 files changed, 100 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/dash-offset-negative.c b/libs/cairo-1.16.0/test/dash-offset-negative.c
new file mode 100644
index 0000000..8766cc5
--- /dev/null
+++ b/libs/cairo-1.16.0/test/dash-offset-negative.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright © 2005 Red Hat, Inc.
+ *
+ * Permission to use, copy, modify, distribute, and sell this software
+ * and its documentation for any purpose is hereby granted without
+ * fee, provided that the above copyright notice appear in all copies
+ * and that both that copyright notice and this permission notice
+ * appear in supporting documentation, and that the name of
+ * Red Hat, Inc. not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Red Hat, Inc. makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * RED HAT, INC. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL RED HAT, INC. BE LIABLE FOR ANY SPECIAL,
+ * INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER
+ * RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
+ * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
+ * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * Author: Owen Taylor <otaylor@redhat.com>
+ */
+
+#include "cairo-test.h"
+
+#define IMAGE_WIDTH 19
+#define IMAGE_HEIGHT 19
+
+/* Basic test of dashed strokes, including a test for the negative
+ * dash offset bug:
+ *
+ *	https://bugs.freedesktop.org/show_bug.cgi?id=2729
+ */
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    double dashes[] = { 1 };
+
+    /* 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, 2);
+
+    /* Basic 1-1 dash pattern */
+    cairo_set_dash (cr, dashes, 1, 0.);
+
+    cairo_move_to (cr,  1, 2);
+    cairo_line_to (cr, 18, 2);
+    cairo_stroke (cr);
+
+    /* Adjust path by 0.5. Ideally this would give a constant 50%
+     * gray, (but does not due to the location of the regular sample
+     * grid points. */
+    cairo_move_to (cr, 1.5, 5);
+    cairo_line_to (cr, 18., 5);
+    cairo_stroke (cr);
+
+    /* Offset dash by 0.5, rather than the path */
+    cairo_set_dash (cr, dashes, 1, 0.5);
+
+    cairo_move_to (cr,  1, 8);
+    cairo_line_to (cr, 18, 8);
+    cairo_stroke (cr);
+
+    /* Now, similar tests with negative dash offsets. */
+
+    /* Basic 1-1 dash pattern dashing */
+    cairo_set_dash (cr, dashes, 1, -4);
+
+    cairo_move_to (cr,  1, 11);
+    cairo_line_to (cr, 18, 11);
+    cairo_stroke (cr);
+
+    /* Adjust path by 0.5 */
+    cairo_move_to (cr, 1.5, 14);
+    cairo_line_to (cr, 18., 14);
+    cairo_stroke (cr);
+
+    /* Offset dash by 0.5 */
+    cairo_set_dash (cr, dashes, 1, -3.5);
+
+    cairo_move_to (cr,  1, 17);
+    cairo_line_to (cr, 18, 17);
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (dash_offset_negative,
+	    "Tests cairo_set_dash with a negative offset",
+	    "dash, stroke", /* keywords */
+	    NULL, /* requirements */
+	    IMAGE_WIDTH, IMAGE_HEIGHT,
+	    NULL, draw)