add cairo

1 files changed, 83 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/test/fill-missed-stop.c b/libs/cairo-1.16.0/test/fill-missed-stop.c
new file mode 100644
index 0000000..5589337
--- /dev/null
+++ b/libs/cairo-1.16.0/test/fill-missed-stop.c
@@ -0,0 +1,83 @@
+/*
+ * Copyright © 2006 M Joonas Pihlaja
+ *
+ * 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: M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
+ */
+
+/* Bug history
+ *
+ * 2006-12-05  M Joonas Pihlaja <jpihlaja@cc.helsinki.fi>
+ *
+ *  The tessellator has a regression where a trapezoid may continue
+ *  below the end of a polygon edge (i.e. the bottom of the trapezoid
+ *  is miscomputed.)  This can only happen if the right edge of a
+ *  trapezoid stops earlier than the left edge and there is no start
+ *  event at the end point of the right edge.
+ */
+
+#include "cairo-test.h"
+
+#define SIZE 50
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_source_rgb (cr, 1, 0, 0);
+
+    cairo_translate (cr, 1, 1);
+
+    /* What it should look like, with # marking the filled areas:
+     *
+     * |\    |\
+     * |#\   |#\
+     * |##\__|##\
+     *     \#|
+     *      \|
+     *
+     * What it looke like with the bug, when the rightmost edge's end
+     * is missed:
+     *
+     * |\    |\
+     * |#\   |#\
+     * |##\__|##\
+     *     \#####|
+     *      \####|
+     */
+
+    cairo_move_to (cr, 0, 0);
+    cairo_line_to (cr, SIZE/2, SIZE);
+    cairo_line_to (cr, SIZE/2, 0);
+    cairo_line_to (cr, SIZE, SIZE/2);
+    cairo_line_to (cr, 0, SIZE/2);
+    cairo_close_path (cr);
+    cairo_fill (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (fill_missed_stop,
+	    "Tests that the tessellator doesn't miss stop events when generating trapezoids",
+	    "fill", /* keywords */
+	    NULL, /* requirements */
+	    SIZE+3, SIZE+3,
+	    NULL, draw)