test: add test to check that pdf transparency groups are non-isolated

test/Makefile.sources

@@ -238,6 +238,7 @@ test_sources = \
 	path-precision.c				\
 	pattern-get-type.c				\
 	pattern-getters.c				\
+	pdf-isolated-group.c				\
 	pixman-rotate.c					\
 	png.c						\
 	push-group.c					\

test/pdf-isolated-group.c

@@ -0,0 +1,73 @@
+/*
+ * Copyright © 2012 Adrian Johnson
+ *
+ * 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: Adrian Johnson <ajohnson@redneon.com>
+ */
+
+#include "cairo-test.h"
+
+#define SIZE 60
+#define WIDTH  SIZE
+#define HEIGHT SIZE
+
+
+/* PDF transparency groups can be isolated or non-isolated. This test
+ * checks that the PDF output is using isolated groups. If the group
+ * is non-isolated the bottom half of the inner rectangle will be
+ * red. Note poppler-cairo currently ignores the isolated flag and
+ * treats the group as isolated.
+ *
+ * Refer to http://www.pdfvt.com/PDFVT_TransparencyGuide.html for an
+ * explanation isolated vs non-isolated.
+ */
+
+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, 1, 0.5, 0);
+    cairo_rectangle (cr, 0, SIZE/2, SIZE, SIZE/2);
+    cairo_fill (cr);
+
+    cairo_set_operator (cr, CAIRO_OPERATOR_MULTIPLY);
+
+    cairo_push_group (cr);
+
+    cairo_set_source_rgb (cr, 0.7, 0.7, 0.7);
+    cairo_rectangle (cr, SIZE/4, SIZE/4, SIZE/2, SIZE/2);
+    cairo_fill (cr);
+
+    cairo_pop_group_to_source (cr);
+    cairo_paint (cr);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (pdf_isolated_group,
+	    "Check that transparency groups in PDF output are isolated",
+	    "group, operator", /* keywords */
+	    NULL, /* requirements */
+	    WIDTH, HEIGHT,
+	    NULL, draw)