[test] Test handling of fractional device offsets.

1 files changed, 80 insertions, 0 deletions

diff --git a/test/device-offset-fractional.c b/test/device-offset-fractional.c
new file mode 100644
index 000000000..d30154163
--- /dev/null
+++ b/test/device-offset-fractional.c
@@ -0,0 +1,80 @@
+/*
+ * Copyright © 2006 Red Hat, Inc.
+ * 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
+ * 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 SIZE 10
+#define PAD 4
+#define COUNT 4
+
+static cairo_test_draw_function_t draw;
+
+static const cairo_test_t test = {
+    "device-offset-fractional",
+    "Test using image surfaces with fractional device-offsets as sources.",
+    COUNT*(SIZE+PAD+.5)+PAD, COUNT*(SIZE+PAD+.5)+PAD,
+    draw
+};
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_surface_t *surface;
+    cairo_t *cr2;
+    int i,j;
+
+    /* Fill the background */
+    cairo_set_source_rgb (cr, 1, 1, 1); /* white */
+    cairo_paint (cr);
+
+    surface = cairo_image_surface_create (CAIRO_FORMAT_RGB24, SIZE, SIZE);
+    cr2 = cairo_create (surface);
+    cairo_surface_destroy (surface);
+
+    cairo_set_source_rgb (cr2, 0, 0, 1); /* blue */
+    cairo_paint (cr2);
+
+    cairo_set_source_surface (cr, cairo_get_target (cr2), 0, 0);
+    cairo_destroy (cr2);
+
+    for (i = 0; i < COUNT; i++) {
+	for (j = 0; j < COUNT; j++) {
+	    cairo_surface_set_device_offset (surface,
+					     -i*(SIZE+PAD+.5)-PAD,
+					     -j*(SIZE+PAD+.5)-PAD);
+	    cairo_paint (cr);
+	}
+    }
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+int
+main (void)
+{
+    return cairo_test (&test);
+}