test: Add negative-stride-image

Add a test to check that all the backends can handle images with
negative stride.

1 files changed, 71 insertions, 0 deletions

diff --git a/test/negative-stride-image.c b/test/negative-stride-image.c
new file mode 100644
index 000000000..a407b8cf9
--- /dev/null
+++ b/test/negative-stride-image.c
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2012 Andrea Canciani
+ *
+ * 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: Andrea Canciani <ranma42@gmail.com>
+ */
+
+#include "cairo-test.h"
+
+static const char *png_filename = "romedalen.png";
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    const cairo_test_context_t *ctx = cairo_test_get_context (cr);
+    cairo_format_t format = CAIRO_FORMAT_ARGB32;
+    cairo_t *cr_inv;
+    cairo_surface_t *png, *inv;
+    uint8_t *data;
+    int stride;
+
+    png = cairo_test_create_surface_from_png (ctx, png_filename);
+
+    stride = cairo_format_stride_for_width (format, width);
+    data = calloc (stride, height);
+    inv = cairo_image_surface_create_for_data (data + stride * (height - 1),
+					       format, width, height, -stride);
+
+    cr_inv = cairo_create (inv);
+    cairo_set_source_surface (cr_inv, png, 0, 0);
+    cairo_paint (cr_inv);
+    cairo_destroy (cr_inv);
+
+    cairo_set_source_surface (cr, inv, 0, 0);
+    cairo_paint (cr);
+
+    cairo_surface_destroy (png);
+
+    cairo_surface_finish (inv);
+    cairo_surface_destroy (inv);
+
+    free (data);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (negative_stride_image,
+	    "Test that images with a negative stride are handled correctly.",
+	    "stride, image", /* keywords */
+	    NULL, /* requirements */
+	    256, 192,
+	    NULL, draw)