1 files changed, 96 insertions, 0 deletions
diff --git a/libs/cairo-1.16.0/test/overlapping-boxes.c b/libs/cairo-1.16.0/test/overlapping-boxes.c
new file mode 100644
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--- /dev/null
+++ b/libs/cairo-1.16.0/test/overlapping-boxes.c
@@ -0,0 +1,96 @@
+/*
+ * 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>
+ */
+
+/* Not strictly overlapping, but it does highlight the error in
+ * an optimisation of fill-box handling that I frequently am
+ * tempted to write.
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH		(20)
+#define HEIGHT		(20)
+
+static void
+border (cairo_t *cr)
+{
+    cairo_rectangle (cr, 1, 1, 8, 8);
+    cairo_rectangle (cr, 1.25, 1.25, 7.5, 7.5);
+    cairo_rectangle (cr, 1.75, 1.75, 6.5, 6.5);
+    cairo_rectangle (cr, 2, 2, 6, 6);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_fill_rule (cr, CAIRO_FILL_RULE_EVEN_ODD);
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    border (cr);
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_set_operator (cr, CAIRO_OPERATOR_OVER);
+    cairo_fill (cr);
+
+    cairo_translate (cr, 10, 0);
+
+    border (cr);
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+    cairo_fill (cr);
+
+    cairo_translate (cr, 0, 10);
+
+    cairo_rectangle (cr, 0, 0, 10, 10);
+    cairo_clip (cr);
+
+    border (cr);
+    cairo_set_source_rgb (cr, 0, 1, 0);
+    cairo_set_operator (cr, CAIRO_OPERATOR_IN);
+    cairo_fill (cr);
+
+    cairo_reset_clip (cr);
+
+    cairo_translate (cr, -10, 0);
+
+    cairo_rectangle (cr, 0, 0, 10, 10);
+    cairo_clip (cr);
+
+    border (cr);
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_set_operator (cr, CAIRO_OPERATOR_CLEAR);
+    cairo_fill (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (overlapping_boxes,
+	    "A sub-pixel double border to highlight the danger in an easy optimisation",
+	    "fill", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)