[test] Add clip-device-offset

Exercises a bug demonstrated by WebKit with clipping + device offsets.

5 files changed, 82 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
index a6e8be32..9ad41f52 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -167,6 +167,8 @@ REFERENCE_IMAGES = \
 	clear.svg12.argb32.xfail.png \
 	clear.svg12.rgb24.xfail.png \
 	clip-all.ref.png \
+	clip-device-offset.argb32.ref.png \
+	clip-device-offset.rgb24.ref.png \
 	clip-disjoint.ref.png \
 	clip-disjoint.xlib.ref.png \
 	clip-empty.ref.png \
diff --git a/test/Makefile.sources b/test/Makefile.sources
index 769fb0f3..c313852c 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -15,6 +15,7 @@ test_sources = \
 	clear.c						\
 	clip-all.c					\
 	clip-disjoint.c					\
+	clip-device-offset.c				\
 	clip-empty.c					\
 	clip-fill.c					\
 	clip-fill-rule.c				\
diff --git a/test/clip-device-offset.argb32.ref.png b/test/clip-device-offset.argb32.ref.png
new file mode 100644
index 00000000..06be9851
--- /dev/null
+++ b/test/clip-device-offset.argb32.ref.png
diff --git a/test/clip-device-offset.c b/test/clip-device-offset.c
new file mode 100644
index 00000000..eb0e2495
--- /dev/null
+++ b/test/clip-device-offset.c
@@ -0,0 +1,79 @@
+/*
+ * Copyright © 2009 Benjamin Otte
+ *
+ * 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.
+ *
+ * Authors: Benjamin Otte <otte@gnome.org>
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH 50
+#define HEIGHT 50
+
+static cairo_pattern_t *
+create_green_source (void)
+{
+  cairo_surface_t *image;
+  cairo_pattern_t *pattern;
+  cairo_t *cr;
+
+  image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, WIDTH, HEIGHT);
+  cr = cairo_create (image);
+  cairo_surface_destroy (image);
+
+  cairo_set_source_rgb (cr, 0, 1, 0);
+  cairo_paint (cr);
+
+  pattern = cairo_pattern_create_for_surface (cairo_get_target (cr));
+  cairo_destroy (cr);
+
+  return pattern;
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+  cairo_pattern_t *source;
+  double old_x, old_y;
+
+  cairo_surface_get_device_offset (cairo_get_target (cr), &old_x, &old_y);
+  cairo_surface_set_device_offset (cairo_get_target (cr), old_x+5, old_y+5);
+
+  source = create_green_source ();
+  cairo_set_source (cr, source);
+  cairo_pattern_destroy (source);
+
+  cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+  cairo_rectangle (cr, 0, 0, WIDTH, HEIGHT);
+  cairo_clip (cr);
+  cairo_paint (cr);
+
+  cairo_surface_set_device_offset (cairo_get_target (cr), old_x, old_y);
+
+  return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (clip_device_offset,
+	    "Test clipping on surfaces with device offsets",
+	    "clip", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH+10, HEIGHT+10,
+	    NULL, draw)
diff --git a/test/clip-device-offset.rgb24.ref.png b/test/clip-device-offset.rgb24.ref.png
new file mode 100644
index 00000000..24193845
--- /dev/null
+++ b/test/clip-device-offset.rgb24.ref.png