[test] Add reflected-stroke to exercise stroking with a reflected ctm.

Parts of the stroker depend upon whether we have in effect a reflection
matrix (one whose determinant < 0). This test incopororates the same
drawing under the a couple of reflections to exercise stroking under
matrices with both positive and negative determinants.

1 files changed, 100 insertions, 0 deletions

diff --git a/test/reflected-stroke.c b/test/reflected-stroke.c
new file mode 100644
index 000000000..aa320987c
--- /dev/null
+++ b/test/reflected-stroke.c
@@ -0,0 +1,100 @@
+/*
+ * Copyright © 2008 Chris Wilson
+ *
+ * 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
+ * the author not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. The author makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL THE AUTHOR. 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: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_draw_function_t draw;
+
+cairo_test_t test = {
+    "reflected-stroke",
+    "Exercises the stroker with a reflected ctm",
+    200, 200,
+    draw
+};
+
+static void
+draw_symbol (cairo_t *cr)
+{
+    double dash[] = {6, 3};
+
+    cairo_rectangle (cr, -25, -25, 50, 50);
+    cairo_stroke (cr);
+
+    cairo_move_to (cr, 0, -25);
+    cairo_curve_to (cr, 12.5, -12.5, 12.5, -12.5, 0, 0);
+    cairo_curve_to (cr, -12.5, 12.5, -12.5, 12.5, 0, 25);
+    cairo_curve_to (cr, 12.5, 12.5, 12.5, 12.5, 0, 0);
+    cairo_stroke (cr);
+
+    cairo_save (cr);
+    cairo_set_dash (cr, dash, sizeof (dash) / sizeof (dash[0]), 0.);
+    cairo_move_to (cr, 0, 0);
+    cairo_arc (cr, 0, 0, 12.5, 0, 3 * M_PI / 2);
+    cairo_close_path (cr);
+    cairo_stroke (cr);
+    cairo_restore (cr);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    cairo_set_source_rgb (cr, 0, 0, 0);
+
+    cairo_save (cr);
+    cairo_translate (cr, 50, 50);
+    cairo_scale (cr, 1, 1);
+    draw_symbol (cr);
+    cairo_restore (cr);
+
+    cairo_save (cr);
+    cairo_translate (cr, 150, 50);
+    cairo_scale (cr, -1, 1);
+    draw_symbol (cr);
+    cairo_restore (cr);
+
+    cairo_save (cr);
+    cairo_translate (cr, 150, 150);
+    cairo_scale (cr, -1, -1);
+    draw_symbol (cr);
+    cairo_restore (cr);
+
+    cairo_save (cr);
+    cairo_translate (cr, 50, 150);
+    cairo_scale (cr, 1, -1);
+    draw_symbol (cr);
+    cairo_restore (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}
+