[test] Add radial-gradient-source

ranma42 found a bug in compositing with a radial gradient using the
SOURCE operator with EXTEND_NONE, as exercised here.

5 files changed, 118 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
index d7813f7f..54c82bd9 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -778,6 +778,8 @@ REFERENCE_IMAGES = \
 	radial-gradient.quartz.ref.png \
 	radial-gradient.ref.png \
 	radial-gradient.svg.xfail.png \
+	radial-gradient-source.argb32.ref.png \
+	radial-gradient-source.rgb24.ref.png \
 	random-intersections-eo.ps.ref.png \
 	random-intersections-eo.quartz.ref.png \
 	random-intersections-eo.ref.png \
diff --git a/test/Makefile.sources b/test/Makefile.sources
index c313852c..840c1e42 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -159,6 +159,7 @@ test_sources = \
 	push-group.c					\
 	push-group-color.c				\
 	radial-gradient.c				\
+	radial-gradient-source.c			\
 	random-intersections-eo.c			\
 	random-intersections-nonzero.c			\
 	random-intersections-curves-eo.c		\
diff --git a/test/radial-gradient-source.argb32.ref.png b/test/radial-gradient-source.argb32.ref.png
new file mode 100644
index 00000000..47334714
--- /dev/null
+++ b/test/radial-gradient-source.argb32.ref.png
diff --git a/test/radial-gradient-source.c b/test/radial-gradient-source.c
new file mode 100644
index 00000000..b546157a
--- /dev/null
+++ b/test/radial-gradient-source.c
@@ -0,0 +1,115 @@
+/*
+ * Copyright © 2005, 2007 Red Hat, Inc.
+ *
+ * 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: Carl D. Worth <cworth@cworth.org>
+ */
+
+/* 20091017: A simple variant on radial-gradient, using the SOURCE operator
+ * instead as a potential bug was found in pixman under those conditions.
+ */
+
+#include "cairo-test.h"
+
+#define NUM_GRADIENTS 4
+#define NUM_EXTEND 4
+#define SIZE 60
+#define WIDTH (SIZE * NUM_GRADIENTS * NUM_GRADIENTS)
+#define HEIGHT (SIZE * NUM_EXTEND)
+
+static void
+draw_gradient (cairo_t		*cr,
+	       int		x,
+	       int		y,
+	       int		size,
+	       double		r1_offset,
+	       double		r1_radius,
+	       double		r2_offset,
+	       double		r2_radius,
+	       cairo_extend_t	extend)
+{
+    cairo_pattern_t *pattern;
+
+    cairo_save (cr);
+
+    pattern = cairo_pattern_create_radial (x + size/2.0 + r1_offset,
+					   y + size/2.0 + r1_offset,
+					   r1_radius,
+					   x + size/2.0 + r2_offset,
+					   y + size/2.0 + r2_offset,
+					   r2_radius);
+    cairo_pattern_add_color_stop_rgba (pattern, 0.0,
+				       1.0, 0.0, 0.0, 1.0);
+    cairo_pattern_add_color_stop_rgba (pattern, sqrt (1.0 / 2.0),
+				       0.0, 1.0, 0.0, 0.0);
+    cairo_pattern_add_color_stop_rgba (pattern, 1.0,
+				       0.0, 0.0, 1.0, 0.5);
+    cairo_pattern_set_extend (pattern, extend);
+
+    cairo_rectangle (cr, x, y, size, size);
+    cairo_clip (cr);
+
+    cairo_set_source (cr, pattern);
+    cairo_paint (cr);
+
+    cairo_pattern_destroy (pattern);
+
+    cairo_restore (cr);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    int i, j, k;
+    cairo_extend_t extend[NUM_EXTEND] = {
+	CAIRO_EXTEND_NONE,
+	CAIRO_EXTEND_REPEAT,
+	CAIRO_EXTEND_REFLECT,
+	CAIRO_EXTEND_PAD
+    };
+
+    cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+    for (j = 0; j < NUM_EXTEND; j++) {
+	for (i = 0; i < NUM_GRADIENTS; i++) {
+	    double r1_offset = i % 2 ? SIZE / 12.0 : 0.0;
+	    double r1_radius = i >= NUM_GRADIENTS / 2 ? SIZE / 6.0 : 0.0;
+	    for (k = 0; k < NUM_GRADIENTS; k++) {
+		double r2_offset = k % 2 ? SIZE / 12.0 : 0.0;
+		double r2_radius = k >= NUM_GRADIENTS / 2 ? SIZE / 3.0 : SIZE / 12.;
+		draw_gradient (cr,
+			       i * SIZE * NUM_GRADIENTS + k * SIZE, j * SIZE, SIZE,
+			       r1_offset, r1_radius,
+			       r2_offset, r2_radius,
+			       extend[j]);
+	    }
+	}
+    }
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (radial_gradient_source,
+	    "Simple test of radial gradients using the SOURCE operator",
+	    "gradient,source", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)
diff --git a/test/radial-gradient-source.rgb24.ref.png b/test/radial-gradient-source.rgb24.ref.png
new file mode 100644
index 00000000..27e9927d
--- /dev/null
+++ b/test/radial-gradient-source.rgb24.ref.png