[test] Stress test using large source images.

This test attempts to trigger failures in those backend clone_similar
methods that have size restrictions on the resulting image.  It also
triggers errors in scaling down large image surfaces as the image
backend also fails this test.

1 files changed, 64 insertions, 0 deletions

diff --git a/test/large-source-roi.c b/test/large-source-roi.c
new file mode 100644
index 000000000..097390f8f
--- /dev/null
+++ b/test/large-source-roi.c
@@ -0,0 +1,64 @@
+/*
+ * Copyright © 2009 Joonas Pihlaja
+ *
+ * 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 the copyright holders not be used in advertising or
+ * publicity pertaining to distribution of the software without specific,
+ * written prior permission.  The copyright holders make no representations
+ * about the suitability of this software for any purpose.  It is provided "as
+ * is" without express or implied warranty.
+ *
+ * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
+ * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
+ * EVENT SHALL THE COPYRIGHT HOLDERS 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.
+ */
+
+#include "cairo-test.h"
+
+/* This test attempts to trigger failures in those clone_similar
+ * backend methods that have size restrictions. */
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_surface_t *source;
+    double source_width = 66000.0;
+
+    cairo_set_source_rgb (cr, 1,1,1);
+    cairo_paint (cr);
+
+    /* Create an excessively wide source image, all red. */
+    source = cairo_image_surface_create (CAIRO_FORMAT_RGB24, source_width, height);
+    {
+	cairo_t *cr2 = cairo_create (source);
+	cairo_set_source_rgb (cr2, 1,0,0); /* red */
+	cairo_paint (cr2);
+	cairo_destroy (cr2);
+    }
+
+    /* Set a transform so that the source is scaled down to fit in the
+     * destination horizontally and then paint the entire source to
+     * the context. */
+    cairo_scale (cr, width/source_width, 1.0);
+    cairo_set_source_surface (cr, source, 0, 0);
+    cairo_set_operator (cr, CAIRO_OPERATOR_SOURCE);
+    cairo_paint (cr);
+
+    cairo_surface_destroy (source);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (large_source_roi,
+	    "Uses a all of a large source image.",
+	    "stress, source", /* keywords */
+	    NULL, /* requirements */
+	    20, 20,
+	    NULL, draw)