1 files changed, 77 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/horizontal-clip.c b/libs/cairo-1.16.0/test/horizontal-clip.c
new file mode 100644
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+++ b/libs/cairo-1.16.0/test/horizontal-clip.c
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+/*
+ * Copyright 2011 Intel Corporation
+ *
+ * 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
+ * Chris Wilson not be used in advertising or publicity pertaining to
+ * distribution of the software without specific, written prior
+ * permission. Chris Wilson makes no representations about the
+ * suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON 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>
+ */
+
+/* Exercises a bug spotted by Andrea Canciani where the polygon clipping
+ * code was hopeless broken with horizontal edges.
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH 16
+#define HEIGHT 26
+
+#define BUGY 1
+#define BUGX (4 * BUGY * WIDTH * 256)
+
+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_move_to (cr,       - BUGX, 6 - BUGY);
+    cairo_line_to (cr,       + BUGX, 6 + BUGY);
+    cairo_line_to (cr, WIDTH + BUGX, 2 - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 2 + BUGY);
+    cairo_fill (cr);
+
+    cairo_move_to (cr, WIDTH + BUGX, 8  - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 8  + BUGY);
+    cairo_line_to (cr,       - BUGX, 12 - BUGY);
+    cairo_line_to (cr,       + BUGX, 12 + BUGY);
+    cairo_fill (cr);
+
+    cairo_move_to (cr,       - BUGX, 14 - BUGY);
+    cairo_line_to (cr,       + BUGX, 14 + BUGY);
+    cairo_line_to (cr, WIDTH + BUGX, 18 - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 18 + BUGY);
+    cairo_fill (cr);
+
+    cairo_move_to (cr, WIDTH + BUGX, 24 - BUGY);
+    cairo_line_to (cr, WIDTH - BUGX, 24 + BUGY);
+    cairo_line_to (cr,       - BUGX, 20 - BUGY);
+    cairo_line_to (cr,       + BUGX, 20 + BUGY);
+    cairo_fill (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (horizontal_clip,
+	    "Tests intersection of a nearly horizontal lines with a clipped polygon",
+	    "clip, fill", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)