test: Add inverse text

This is exercising a bug that I have introduced either in the xcb
backend or in the driver in my experimental branches. So simple, yet so
wrong.

test/Makefile.am

@@ -568,6 +568,7 @@ REFERENCE_IMAGES = \
 	infinite-join.ps2.ref.png \
 	infinite-join.ps3.ref.png \
 	infinite-join.ref.png \
+	inverse-text.ref.png \
 	joins.ps.ref.png \
 	joins.ref.png \
 	large-clip.ref.png \

test/Makefile.sources

@@ -118,6 +118,7 @@ test_sources = \
 	in-fill-empty-trapezoid.c			\
 	in-fill-trapezoid.c				\
 	invalid-matrix.c				\
+	inverse-text.c					\
 	joins.c						\
 	large-clip.c					\
 	large-font.c					\

test/inverse-text.c

@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2006 Red Hat, Inc.
+ * Copyright © 2010 Intel Corporation
+ *
+ * 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.
+ *
+ * Author: Carl D. Worth <cworth@cworth.org>
+ *         Chris Wilson <chris@chris-wilson.co.uk>
+ */
+
+#include "cairo-test.h"
+
+#define TEXT_SIZE 12
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    /* This is just the inverse of select-font-face.c */
+    cairo_set_source_rgb (cr, 0.0, 0.0, 0.0);
+    cairo_paint (cr);
+
+    cairo_set_source_rgb (cr, 1, 1, 1);
+
+    cairo_set_font_size (cr, TEXT_SIZE);
+    cairo_move_to (cr, 0, TEXT_SIZE);
+
+    cairo_select_font_face (cr, "Bitstream Vera Serif",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_show_text (cr, "i-am-serif");
+
+    cairo_select_font_face (cr, "Bitstream Vera Sans",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_show_text (cr, " i-am-sans");
+
+    cairo_select_font_face (cr, "Bitstream Vera Sans Mono",
+			    CAIRO_FONT_SLANT_NORMAL,
+			    CAIRO_FONT_WEIGHT_NORMAL);
+    cairo_show_text (cr, " i-am-mono");
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (inverse_text,
+	    "Tests rendering of inverse text (white-on-black)",
+	    "font, text", /* keywords */
+	    NULL, /* requirements */
+	    192, TEXT_SIZE + 4,
+	    NULL, draw)