test: Add bug-extents

Add a test for the computation of approximate extents used by most
backends to esimate the region affected by drawing operations.

Based on:
http://lists.cairographics.org/archives/cairo/2010-December/021331.html

8 files changed, 65 insertions, 0 deletions

diff --git a/test/Makefile.am b/test/Makefile.am
index ad2b9593..9b673d2c 100644
--- a/test/Makefile.am
+++ b/test/Makefile.am
@@ -162,6 +162,11 @@ REFERENCE_IMAGES = \
 	bug-bo-rectangular.ref.png \
 	bug-bo-rectangular.image16.ref.png \
 	bug-bo-rectangular.ps.xfail.png \
+	bug-extents.image16.ref.png \
+	bug-extents.quartz.ref.png \
+	bug-extents.ps.ref.png \
+	bug-extents.ref.png \
+	bug-extents.xlib.ref.png \
 	bug-seams.ref.png \
 	bug-seams.xlib.ref.png \
 	bug-seams.xlib-fallback.ref.png \
diff --git a/test/Makefile.sources b/test/Makefile.sources
index b6431d17..487fedd5 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -14,6 +14,7 @@ test_sources = \
 	big-trap.c					\
 	bilevel-image.c					\
 	bug-bo-rectangular.c				\
+	bug-extents.c					\
 	bug-seams.c					\
 	caps.c						\
 	caps-joins.c					\
diff --git a/test/bug-extents.c b/test/bug-extents.c
new file mode 100644
index 00000000..4edb4a54
--- /dev/null
+++ b/test/bug-extents.c
@@ -0,0 +1,59 @@
+/* -*- Mode: c; c-basic-offset: 4; indent-tabs-mode: t; tab-width: 8; -*- */
+/*
+ * Copyright 2010 Andrea Canciani
+ *
+ * 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: Andrea Canciani <ranma42@gmail.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_translate (cr, 0, -25);
+
+    cairo_move_to  (cr,   50, 200);
+    cairo_curve_to (cr,   50, 150, 100,  50, 150,  50);
+    cairo_curve_to (cr,  200,  50, 250, 250, 200, 250);
+    cairo_curve_to (cr,  150, 250, 200,  50,  50, 100);
+    cairo_curve_to (cr, -100, 150, 200, 150, 200, 200);
+    cairo_curve_to (cr,  200, 250,  50, 250,  50, 200);
+
+    cairo_set_source_rgb (cr, 0, 0, 0);
+    cairo_fill_preserve (cr);
+
+    cairo_set_source_rgb (cr, 1, 0, 0);
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (bug_extents,
+	    "Tests a bug in the computation of approximate extents",
+	    "extents", /* keywords */
+	    NULL, /* requirements */
+	    250, 250,
+	    NULL, draw)
diff --git a/test/bug-extents.image16.ref.png b/test/bug-extents.image16.ref.png
new file mode 100644
index 00000000..8eb3d4bc
--- /dev/null
+++ b/test/bug-extents.image16.ref.png
diff --git a/test/bug-extents.ps.ref.png b/test/bug-extents.ps.ref.png
new file mode 100644
index 00000000..2d554056
--- /dev/null
+++ b/test/bug-extents.ps.ref.png
diff --git a/test/bug-extents.quartz.ref.png b/test/bug-extents.quartz.ref.png
new file mode 100644
index 00000000..29734483
--- /dev/null
+++ b/test/bug-extents.quartz.ref.png
diff --git a/test/bug-extents.ref.png b/test/bug-extents.ref.png
new file mode 100644
index 00000000..c388bad5
--- /dev/null
+++ b/test/bug-extents.ref.png
diff --git a/test/bug-extents.xlib.ref.png b/test/bug-extents.xlib.ref.png
new file mode 100644
index 00000000..c2db4f0b
--- /dev/null
+++ b/test/bug-extents.xlib.ref.png