add cairo

1 files changed, 85 insertions, 0 deletions

diff --git a/libs/cairo-1.16.0/test/leaky-polygon.c b/libs/cairo-1.16.0/test/leaky-polygon.c
new file mode 100644
index 0000000..0ea7094
--- /dev/null
+++ b/libs/cairo-1.16.0/test/leaky-polygon.c
@@ -0,0 +1,85 @@
+/*
+ * 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: Carl D. Worth <cworth@cworth.org>
+ */
+
+/* Bug history
+ *
+ * 2005-01-07 Carl Worth <cworth@cworth.org>
+ *
+ *   Bug reported:
+ *
+ *     From: Chris <fltk@functionalfuture.com>
+ *     Subject: [cairo] Render to image buffer artifacts
+ *     To: cairo@cairographics.org
+ *     Date: Fri, 07 Jan 2005 02:22:28 -0500
+ *
+ *     I've attached the code and image that shows this off.  Scaling at
+ *     different levels seems to change the corruption.
+ *
+ *     For some reason there are artifacts in the alpha channel.  I don't know
+ *     if that's the only place, but the alpha channel looks bad.
+ *
+ *     If you run the code and parse the attached image, directing stdout to a
+ *     file, you can see in the lower left corner there are alpha values where
+ *     it should be transparent.
+ *     [...]
+ *
+ * 2005-01-11 Carl Worth <cworth@cworth.org>
+ *
+ *   I trimmed the original test case down to the code that appears here.
+ *
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH 21
+#define HEIGHT 21
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    /* 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_scale (cr, 1.0/(1<<16), 1.0/(1<<16));
+
+    cairo_move_to (cr, 131072,39321);
+    cairo_line_to (cr, 1103072,1288088);
+    cairo_line_to (cr, 1179648,1294990);
+    cairo_close_path (cr);
+
+    cairo_fill (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (leaky_polygon,
+	    "Exercises a corner case in the trapezoid rasterization in which pixels outside the trapezoids received a non-zero alpha",
+	    "fill, trap", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)