test: Add xcb-huge-subimage

This creates an image surface with a non-natural stride and paints it to a
similar surface.

In the xcb backend, this causes a call to _cairo_xcb_connection_put_subimage()
which tries to send a huge PutImage request. As a result, xcb kills the X11
connection.

Signed-off-by: Uli Schlachter <psychon@znc.in>

3 files changed, 82 insertions, 0 deletions

diff --git a/test/Makefile.sources b/test/Makefile.sources
index 7dc8b889..1bf93e52 100644
--- a/test/Makefile.sources
+++ b/test/Makefile.sources
@@ -367,6 +367,7 @@ test_sources = \
 	world-map.c					\
 	white-in-noop.c					\
 	xcb-huge-image-shm.c				\
+	xcb-huge-subimage.c				\
 	xcb-stress-cache.c				\
 	xcb-snapshot-assert.c				\
 	xcomposite-projection.c				\
diff --git a/test/reference/xcb-huge-subimage.ref.png b/test/reference/xcb-huge-subimage.ref.png
new file mode 100644
index 00000000..a0b24c8a
--- /dev/null
+++ b/test/reference/xcb-huge-subimage.ref.png
diff --git a/test/xcb-huge-subimage.c b/test/xcb-huge-subimage.c
new file mode 100644
index 00000000..fc8e278c
--- /dev/null
+++ b/test/xcb-huge-subimage.c
@@ -0,0 +1,81 @@
+/*
+ * Copyright © 2012 Uli Schlachter
+ *
+ * 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: Uli Schlachter <psychon@znc.in>
+ */
+
+#include "cairo-test.h"
+
+#define WIDTH 6000
+#define HEIGHT 6000
+
+static cairo_test_status_t
+draw (cairo_t *cr, int width, int height)
+{
+    cairo_surface_t *surface;
+    cairo_surface_t *image;
+    cairo_surface_t *subimage;
+    cairo_rectangle_int_t extents;
+    cairo_t *cr2;
+
+    extents.x = extents.y = 10;
+    extents.width = WIDTH - 20;
+    extents.height = HEIGHT - 20;
+
+    /* We use a similar surface to have way smaller ref images */
+    surface = cairo_surface_create_similar (cairo_get_target (cr),
+					    CAIRO_CONTENT_COLOR_ALPHA,
+					    WIDTH, HEIGHT);
+
+    /* First we have to defeat xcb's deferred clear */
+    cr2 = cairo_create (surface);
+    cairo_test_paint_checkered (cr2);
+    cairo_destroy (cr2);
+
+    /* Get us an image surface with a non-natural stride */
+    image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+					WIDTH, HEIGHT);
+    subimage = cairo_surface_map_to_image (image, &extents);
+
+    /* Paint the subimage to the similar surface and trigger the big upload */
+    cr2 = cairo_create (surface);
+    cairo_set_source_surface (cr2, subimage, 0, 0);
+    cairo_paint (cr2);
+    cairo_destroy (cr2);
+
+    /* Finally we make sure that errors aren't lost. */
+    cairo_surface_unmap_image (image, subimage);
+    cairo_set_source_surface (cr, surface, 0, 0);
+    cairo_paint (cr);
+    cairo_surface_destroy (image);
+    cairo_surface_destroy (surface);
+
+    return CAIRO_TEST_SUCCESS;
+}
+
+CAIRO_TEST (xcb_huge_subimage,
+	    "Test if the maximum request size is honored",
+	    "xcb", /* keywords */
+	    NULL, /* requirements */
+	    2, 2,
+	    NULL, draw)