[test] Add simple cap test.

Add a test case that only exercises capping, useful for developing
new strokers.

test/Makefile.am

@@ -13,6 +13,7 @@ test_sources = \
 	big-line.c					\
 	big-trap.c					\
 	bilevel-image.c					\
+	caps.c						\
 	caps-joins.c					\
 	caps-joins-alpha.c				\
 	caps-sub-paths.c				\
@@ -326,6 +327,8 @@ REFERENCE_IMAGES = \
 	bilevel-image.ref.png		\
 	bitmap-font.ref.png	\
 	bitmap-font.rgb24.ref.png	\
+	caps.ref.png	\
+	caps.ps.ref.png	\
 	caps-joins-alpha.quartz.ref.png	\
 	caps-joins-alpha.ref.png	\
 	caps-joins-alpha.svg12.ref.png	\

test/caps.c

@@ -0,0 +1,87 @@
+/*
+ * Copyright © 2008 Chris Wilson
+ *
+ * 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. Chris Wilson 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.
+ *
+ * Author: Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define LINE_WIDTH	10.
+#define SIZE		(5 * LINE_WIDTH)
+#define PAD		(2 * LINE_WIDTH)
+
+static void
+make_path (cairo_t *cr)
+{
+    int i;
+
+    cairo_save (cr);
+    for (i = 0; i <= 3; i++) {
+	cairo_new_sub_path (cr);
+	cairo_move_to (cr, -SIZE / 2, 0.);
+	cairo_line_to (cr,  SIZE / 2, 0.);
+	cairo_rotate (cr, M_PI / 4.);
+    }
+    cairo_restore (cr);
+}
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_save (cr);
+    cairo_set_source_rgb (cr, 1.0, 1.0, 1.0); /* white */
+    cairo_paint (cr);
+    cairo_restore (cr);
+
+    cairo_set_line_width (cr, LINE_WIDTH);
+    cairo_translate (cr, PAD + SIZE / 2., PAD + SIZE / 2.);
+
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_BUTT);
+    cairo_set_line_join (cr, CAIRO_LINE_JOIN_BEVEL);
+    make_path (cr);
+    cairo_stroke (cr);
+
+    cairo_translate (cr, 0, SIZE + PAD);
+
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_ROUND);
+    cairo_set_line_join (cr, CAIRO_LINE_JOIN_ROUND);
+    make_path (cr);
+    cairo_stroke (cr);
+
+    cairo_translate (cr, 0, SIZE + PAD);
+
+    cairo_set_line_cap (cr, CAIRO_LINE_CAP_SQUARE);
+    cairo_set_line_join (cr, CAIRO_LINE_JOIN_MITER);
+    make_path (cr);
+    cairo_stroke (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (caps,
+	    "Test caps",
+	    "stroke caps", /* keywords */
+	    NULL, /* requirements */
+	    PAD + SIZE + PAD,
+	    3 * (PAD + SIZE) + PAD,
+	    NULL, draw)
+