tests: add output-decorations

This adds a new test checking that output decorations (used in the
wayland-backend, here tested with headless-backend) are drawn correctly.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>

tests/meson.build

@@ -193,6 +193,7 @@ tests = [
 		'dep_objs': [ dep_libdrm_headers ],
 	},
 	{	'name': 'output-damage', },
+	{	'name': 'output-decorations', },
 	{	'name': 'output-transforms', },
 	{	'name': 'plugin-registry', },
 	{

tests/output-decorations-test.c

@@ -0,0 +1,84 @@
+/*
+ * Copyright 2022 Collabora, Ltd.
+ *
+ * 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 (including the
+ * next paragraph) 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.
+ */
+
+#include "config.h"
+
+#include "weston-test-client-helper.h"
+#include "weston-test-fixture-compositor.h"
+
+static enum test_result_code
+fixture_setup(struct weston_test_harness *harness)
+{
+	struct compositor_setup setup;
+
+	compositor_setup_defaults(&setup);
+	setup.renderer = RENDERER_GL;
+	setup.width = 300;
+	setup.height = 150;
+	setup.shell = SHELL_TEST_DESKTOP;
+
+	weston_ini_setup(&setup,
+			 cfgln("[core]"),
+			 cfgln("output-decorations=true"));
+
+	return weston_test_harness_execute_as_client(harness, &setup);
+}
+DECLARE_FIXTURE_SETUP(fixture_setup);
+
+/*
+ * Basic screenshot test for output decorations
+ *
+ * Tests that the cairo-util code for drawing window decorations works at all
+ * through headless-backend. The window decorations are normally used as output
+ * decorations by wayland-backend when the outputs are windows in a parent
+ * compositor.
+ *
+ * This works only with GL-renderer. Pixman-renderer has no code for blitting
+ * output decorations and does not even know they exist.
+ *
+ * Headless-backend sets window title string to NULL because it might be
+ * difficult to ensure text rendering is pixel-precise between different
+ * systems.
+ */
+TEST(output_decorations)
+{
+	struct client *client;
+	struct buffer *shot;
+	pixman_image_t *img;
+	bool match;
+
+	client = create_client();
+
+	shot = client_capture_output(client, client->output,
+				     WESTON_CAPTURE_V1_SOURCE_FULL_FRAMEBUFFER);
+	img = image_convert_to_a8r8g8b8(shot->image);
+
+	match = verify_image(img, "output-decorations", 0, NULL, 0);
+	assert(match);
+
+	pixman_image_unref(img);
+	buffer_destroy(shot);
+	client_destroy(client);
+}

tests/weston-test-client-helper.c

@@ -1537,7 +1537,7 @@ write_image_as_png(pixman_image_t *image, const char *fname)
 	return true;
 }
 
-static pixman_image_t *
+pixman_image_t *
 image_convert_to_a8r8g8b8(pixman_image_t *image)
 {
 	pixman_image_t *ret;
@@ -1685,7 +1685,7 @@ static const struct weston_capture_source_v1_listener output_capturer_source_han
 	.failed = output_capturer_handle_failed,
 };
 
-static struct buffer *
+struct buffer *
 client_capture_output(struct client *client,
 		      struct output *output,
 		      enum weston_capture_v1_source src)

tests/weston-test-client-helper.h

@@ -38,6 +38,7 @@
 #include "weston-test-runner.h"
 #include "weston-test-client-protocol.h"
 #include "viewporter-client-protocol.h"
+#include "weston-output-capture-client-protocol.h"
 
 struct client {
 	struct wl_display *wl_display;
@@ -275,6 +276,14 @@ load_image_from_png(const char *fname);
 struct buffer *
 capture_screenshot_of_output(struct client *client);
 
+struct buffer *
+client_capture_output(struct client *client,
+		      struct output *output,
+		      enum weston_capture_v1_source src);
+
+pixman_image_t *
+image_convert_to_a8r8g8b8(pixman_image_t *image);
+
 bool
 verify_image(pixman_image_t *shot,
 	     const char *ref_image,