[test] Add group-clip

Larry Ewing found an ancient and nasty bug whereby a path was not
corrected whilst pushing and popping groups.

5 files changed, 60 insertions, 0 deletions

diff --git a/AUTHORS b/AUTHORS
index 7f7b0d188..39a31795c 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -23,6 +23,7 @@ John Ellson <ellson@research.att.com> First font/glyph extents functions
 Michael Emmel <mike.emmel@gmail.com> DirectFB backend
 Miklós Erdélyi <erdelyim@gmail.com> Fix typo leading to a crash
 Behdad Esfahbod <behdad@behdad.org> Huge piles of bug fixes, improvements, and general maintenance
+Larry Ewing <lewing@novell.com> Test case for group-clip
 Brian Ewins <Brian.Ewins@gmail.com> ATSUI maintenance (first success at making it really work)
 Bertram Felgenhauer <int-e@gmx.de> Fixes for subtle arithmetic errors
 Damian Frank <damian.frank@gmail.com> Build system improvements for win32
diff --git a/test/Makefile.am b/test/Makefile.am
index ff4d58888..a2275a4c7 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -500,6 +500,7 @@ REFERENCE_IMAGES = \
 	gradient-constant-alpha.rgb24.ref.png \
 	gradient-zero-stops.ref.png \
 	gradient-zero-stops.rgb24.ref.png \
+	group-clip.ref.png \
 	group-paint.ref.png \
 	huge-linear.ps3.ref.png \
 	huge-linear.ref.png \
diff --git a/test/Makefile.sources b/test/Makefile.sources
index 4604b1fff..64c6d043d 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -79,6 +79,7 @@ test_sources = \
 	gradient-alpha.c				\
 	gradient-constant-alpha.c			\
 	gradient-zero-stops.c				\
+	group-clip.c					\
 	group-paint.c					\
 	huge-linear.c					\
 	huge-radial.c					\
diff --git a/test/group-clip.c b/test/group-clip.c
new file mode 100644
index 000000000..b99d8617e
--- /dev/null
+++ b/test/group-clip.c
@@ -0,0 +1,57 @@
+/*
+ * Copyright © Chris Wilson, 2008
+ *
+ * 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
+ * Chris Wilson 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.
+ *
+ * CHRIS WILSON DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS
+ * SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS, IN NO EVENT SHALL CHRIS WILSON 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: Chris Wilson <chris@chris-wilson.co.uk>
+ *          Larry Ewing <lewing@novell.com>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_set_source_rgb (cr, 1, 1, 1);
+    cairo_paint (cr);
+
+    cairo_rectangle (cr, 25, 25, width, height);
+    cairo_clip_preserve (cr);
+    cairo_push_group (cr);
+    cairo_set_source_rgb (cr, 0, 0, 1);
+    cairo_fill (cr);
+    cairo_rectangle (cr, 0, 0, width, height);
+    cairo_pop_group_to_source (cr);
+    cairo_paint (cr);
+
+    cairo_reset_clip (cr);
+    cairo_clip_preserve (cr);
+    cairo_set_source_rgba (cr, 1, 0, 0, .5);
+    cairo_paint (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (group_clip,
+	    "test preserving paths across groups",
+	    "group", /* keywords */
+	    NULL, /* requirements */
+	    40 + 25, 40 + 25,
+	    NULL, draw)
diff --git a/test/group-clip.ref.png b/test/group-clip.ref.png
new file mode 100644
index 000000000..7b8a7532f
--- /dev/null
+++ b/test/group-clip.ref.png