[test] Add a test to exercise the internal twin font

Although Behdad promises that the rendering is subject to improvement,
introduce a test to check consistency across platforms and update as
required.

test/.gitignore

@@ -225,6 +225,7 @@ transforms
 translate-show-surface
 trap-clip
 truetype-tables
+twin
 unantialiased-shapes
 unbounded-operator
 user-data

test/Makefile.am

@@ -173,6 +173,7 @@ transforms$(EXEEXT)					\
 translate-show-surface$(EXEEXT)				\
 trap-clip$(EXEEXT)					\
 truetype-tables$(EXEEXT)				\
+twin$(EXEEXT)						\
 unantialiased-shapes$(EXEEXT)				\
 unbounded-operator$(EXEEXT)				\
 user-data$(EXEEXT)					\
@@ -868,6 +869,9 @@ REFERENCE_IMAGES = \
 	trap-clip-rgb24-ref.png	\
 	trap-clip-pdf-argb32-ref.png \
 	trap-clip-pdf-rgb24-ref.png \
+	twin-ref.png \
+	twin-ps2-ref.png \
+	twin-ps3-ref.png \
 	unantialiased-shapes-ref.png	\
 	unantialiased-shapes-quartz-ref.png \
 	unbounded-operator-ref.png	\

test/twin.c

@@ -0,0 +1,60 @@
+/*
+ * 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"
+
+static cairo_test_draw_function_t draw;
+
+static const cairo_test_t test = {
+    "twin",
+    "Tests the internal font",
+    128, 20,
+    draw
+};
+
+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_set_source_rgb (cr, 0, 0, 0);
+
+    cairo_select_font_face (cr,
+			    "cairo",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_set_font_size (cr, 16);
+
+    cairo_move_to (cr, 4, 14);
+    cairo_show_text (cr, "Is cairo's twin giza?");
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}