test: Add partial-clip-text

This exercises a bug found by Igor Nikitin:

  https://bugs.freedesktop.org/show_bug.cgi?id=29008

test/Makefile.am

@@ -948,6 +948,9 @@ REFERENCE_IMAGES = \
 	paint-with-alpha.ref.png \
 	paint-with-alpha.svg.ref.png \
 	paint.ref.png \
+	partial-clip-text.ref.png \
+	partial-clip-text.ps.ref.png \
+	partial-clip-text.svg.ref.png \
 	partial-coverage-half-reference.ref.png \
 	partial-coverage-half-triangles.ref.png \
 	partial-coverage-intersecting-quads.ref.png \

test/Makefile.sources

@@ -182,6 +182,7 @@ test_sources = \
 	paint-repeat.c					\
 	paint-source-alpha.c				\
 	paint-with-alpha.c				\
+	partial-clip-text.c				\
 	partial-coverage.c				\
 	path-append.c					\
 	path-stroke-twice.c				\

test/partial-clip-text.c

@@ -0,0 +1,50 @@
+/*
+ * Copyright 2010 Igor Nikitin
+ *
+ * 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: Igor Nikitin <igor_nikitin@valentina-db.com>
+ */
+
+#include "cairo-test.h"
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+     cairo_set_source_rgb( cr, 0, 0, 0 );
+     cairo_paint (cr);
+
+     cairo_rectangle (cr, 0, 0, 40, 5);
+     cairo_clip (cr);
+
+     cairo_move_to (cr, 0, 12);
+     cairo_set_source_rgb (cr, 1, 1, 1);
+     cairo_show_text (cr, "CAIRO");
+
+     return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (partial_clip_text,
+	    "Tests drawing text through a single, partial clip.",
+	    "clip, text", /* keywords */
+	    NULL, /* requirements */
+	    40, 15,
+	    NULL, draw)