tests: Add clip-complex-shape

Contributed by Taekyun Kim to exercise a major bug he found in the
treatment of complex clips.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

test/Makefile.refs

@@ -92,6 +92,8 @@ REFERENCE_IMAGES = \
 	clear.svg12.argb32.xfail.png \
 	clear.svg12.rgb24.xfail.png \
 	clip-all.ref.png \
+	clip-complex-shape-eo-aa.ref.png \
+	clip-complex-shape-eo-mono.ref.png \
 	clip-contexts.ref.png \
 	clip-device-offset.argb32.ref.png \
 	clip-device-offset.rgb24.ref.png \

test/Makefile.sources

@@ -28,6 +28,7 @@ test_sources = \
 	clear-source.c					\
 	clip-all.c					\
 	clip-contexts.c					\
+	clip-complex-shape.c				\
 	clip-disjoint.c					\
 	clip-device-offset.c				\
 	clip-draw-unbounded.c				\

test/clip-complex-shape.c

@@ -0,0 +1,114 @@
+/*
+ * Copyright 2011 SCore 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: Taekyun Kim <podain77@gmail.com>
+ */
+
+#include "cairo-test.h"
+
+static void
+rounded_rectangle(cairo_t *cr,
+		  double x, double y,
+		  double width, double height,
+		  double radius)
+{
+    cairo_move_to   (cr, x, y + radius);
+    cairo_line_to   (cr, x, y + height - radius);
+    cairo_curve_to  (cr, x, y + height - radius/2.0,
+			  x + radius/2.0, y + height,
+			  x + radius, y + height);
+    cairo_line_to   (cr, x + width - radius, y + height);
+    cairo_curve_to  (cr, x + width - radius/2.0, y + height,
+		          x + width, y + height - radius/2.0,
+			  x + width, y + height - radius);
+    cairo_line_to   (cr, x + width, y + radius);
+    cairo_curve_to  (cr, x + width, y + radius/2.0,
+		          x + width - radius/2.0, y,
+			  x + width - radius, y);
+    cairo_line_to   (cr, x + radius, y);
+    cairo_curve_to  (cr, x + radius/2.0, y, x, y + radius/2.0, x, y + radius);
+    cairo_close_path(cr);
+}
+
+static void
+background (cairo_t *cr)
+{
+    cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE);
+    cairo_set_source_rgba(cr, 1.0, 1.0, 1.0, 1.0);
+    cairo_paint(cr);
+}
+
+static void
+foreground (cairo_t *cr)
+{
+    cairo_set_source_rgba(cr, 1.0, 0.0, 0.0, 1.0);
+    cairo_set_operator(cr, CAIRO_OPERATOR_OVER);
+    cairo_rectangle(cr, 20, 20, 60, 60);
+    cairo_fill(cr);
+}
+
+static cairo_test_status_t
+clip_eo_mono (cairo_t *cr, int width, int height)
+{
+
+    background (cr);
+
+    cairo_set_antialias(cr, CAIRO_ANTIALIAS_NONE);
+    cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
+    rounded_rectangle(cr, 0, 0, 40, 100, 10);
+    rounded_rectangle(cr, 60, 0, 40, 100, 10);
+    cairo_clip(cr);
+
+    foreground (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+static cairo_test_status_t
+clip_eo_aa (cairo_t *cr, int width, int height)
+{
+    background (cr);
+
+    cairo_set_antialias(cr, CAIRO_ANTIALIAS_DEFAULT);
+    cairo_set_fill_rule(cr, CAIRO_FILL_RULE_EVEN_ODD);
+    rounded_rectangle(cr, 0, 0, 40, 100, 10);
+    rounded_rectangle(cr, 60, 0, 40, 100, 10);
+    cairo_clip(cr);
+
+    foreground (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (clip_complex_shape_eo_mono,
+	    "Test clipping against a complex shape",
+	    "clip", /* keywords */
+	    NULL, /* requirements */
+	    100, 100,
+	    NULL, clip_eo_mono)
+CAIRO_TEST (clip_complex_shape_eo_aa,
+	    "Test clipping against a complex shape",
+	    "clip", /* keywords */
+	    NULL, /* requirements */
+	    100, 100,
+	    NULL, clip_eo_aa)