tests: add test-desktop-shell

This is a new desktop shell plugin, specifically written for tests. It
implements the bare minimum of a WM with predictable window positioning.
It offers a known static background without forking any helper clients
and therefore avoids any races with executing screenshot-based tests.
Not forking unused helper clients also reduces the load during a test
run.

The code was written by Quentin as a part of a much larger private
patch. Pekka, following Emilio's example, extracted just the shell
plugin parts as a stand-alone patch and wrote the commit message.

[Emilio: update to latest weston_layer and shell_init API]

Signed-off-by: Quentin Glidic <sardemff7+git@sardemff7.net>
Signed-off-by: Emilio Pozuelo Monfort <emilio.pozuelo@collabora.co.uk>
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Micah Fedke <micah.fedke@collabora.co.uk>
[Pekka: fix build]

Makefile.am

@@ -1236,6 +1236,7 @@ export abs_builddir
 
 noinst_LTLIBRARIES +=			\
 	weston-test.la			\
+	weston-test-desktop-shell.la	\
 	$(module_tests)			\
 	libtest-runner.la		\
 	libtest-client.la
@@ -1278,6 +1279,13 @@ nodist_weston_test_la_SOURCES =			\
 	protocol/weston-test-protocol.c	\
 	protocol/weston-test-server-protocol.h
 
+weston_test_desktop_shell_la_LIBADD = libshared.la libweston-desktop-@LIBWESTON_MAJOR@.la $(COMPOSITOR_LIBS)
+weston_test_desktop_shell_la_LDFLAGS = $(test_module_ldflags)
+weston_test_desktop_shell_la_CFLAGS = $(AM_CFLAGS) $(COMPOSITOR_CFLAGS)
+weston_test_desktop_shell_la_SOURCES = 			\
+	tests/weston-test-desktop-shell.c		\
+	shared/helpers.h
+
 if ENABLE_EGL
 weston_test_la_CFLAGS += $(EGL_TESTS_CFLAGS)
 weston_test_la_LDFLAGS += $(EGL_TESTS_LIBS)

tests/weston-test-desktop-shell.c

@@ -0,0 +1,198 @@
+/*
+ * Copyright © 2010-2012 Intel Corporation
+ * Copyright © 2011-2012 Collabora, Ltd.
+ * Copyright © 2013 Raspberry Pi Foundation
+ *
+ * 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 <stdlib.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <linux/input.h>
+#include <assert.h>
+#include <signal.h>
+#include <math.h>
+#include <sys/types.h>
+
+#include "compositor/weston.h"
+#include "shared/config-parser.h"
+#include "shared/helpers.h"
+#include "libweston-desktop/libweston-desktop.h"
+
+#ifndef static_assert
+#define static_assert(cond, msg)
+#endif
+
+static struct weston_desktop *desktop = NULL;
+static struct weston_layer background_layer;
+static struct weston_surface *background_surface = NULL;
+static struct weston_view *background_view = NULL;
+static struct weston_layer layer;
+static struct weston_view *view = NULL;
+/*
+ * libweston-desktop
+ */
+
+static void
+desktop_surface_added(struct weston_desktop_surface *desktop_surface,
+		      void *shell)
+{
+
+	assert(!view);
+
+	view = weston_desktop_surface_create_view(desktop_surface);
+
+	assert(view);
+}
+
+static void
+desktop_surface_removed(struct weston_desktop_surface *desktop_surface,
+			void *shell)
+{
+	assert(view);
+
+	weston_desktop_surface_unlink_view(view);
+	weston_view_destroy(view);
+	view = NULL;
+}
+
+static void
+desktop_surface_committed(struct weston_desktop_surface *desktop_surface,
+			  int32_t sx, int32_t sy, void *data)
+{
+	struct weston_surface *surface =
+		weston_desktop_surface_get_surface(desktop_surface);
+	struct weston_geometry geometry =
+		weston_desktop_surface_get_geometry(desktop_surface);
+
+	assert(view);
+
+	if (weston_surface_is_mapped(surface))
+		return;
+
+	surface->is_mapped = true;
+	weston_layer_entry_insert(&layer.view_list, &view->layer_link);
+	weston_view_set_position(view, 0 - geometry.x, 0 - geometry.y);
+	weston_view_update_transform(view);
+	view->is_mapped = true;
+}
+
+static void
+desktop_surface_move(struct weston_desktop_surface *desktop_surface,
+		     struct weston_seat *seat, uint32_t serial, void *shell)
+{
+}
+
+static void
+desktop_surface_resize(struct weston_desktop_surface *desktop_surface,
+		       struct weston_seat *seat, uint32_t serial,
+		       enum weston_desktop_surface_edge edges, void *shell)
+{
+}
+
+static void
+desktop_surface_fullscreen_requested(struct weston_desktop_surface *desktop_surface,
+				     bool fullscreen,
+				     struct weston_output *output, void *shell)
+{
+}
+
+static void
+desktop_surface_maximized_requested(struct weston_desktop_surface *desktop_surface,
+				    bool maximized, void *shell)
+{
+}
+
+static void
+desktop_surface_minimized_requested(struct weston_desktop_surface *desktop_surface,
+				    void *shell)
+{
+}
+
+static void
+desktop_surface_ping_timeout(struct weston_desktop_client *desktop_client,
+			     void *shell)
+{
+}
+
+static void
+desktop_surface_pong(struct weston_desktop_client *desktop_client,
+		     void *shell)
+{
+}
+
+static const struct weston_desktop_api shell_desktop_api = {
+	.struct_size = sizeof(struct weston_desktop_api),
+	.surface_added = desktop_surface_added,
+	.surface_removed = desktop_surface_removed,
+	.committed = desktop_surface_committed,
+	.move = desktop_surface_move,
+	.resize = desktop_surface_resize,
+	.fullscreen_requested = desktop_surface_fullscreen_requested,
+	.maximized_requested = desktop_surface_maximized_requested,
+	.minimized_requested = desktop_surface_minimized_requested,
+	.ping_timeout = desktop_surface_ping_timeout,
+	.pong = desktop_surface_pong,
+};
+
+/* ************************ *
+ * end of libweston-desktop *
+ * ************************ */
+
+WL_EXPORT int
+wet_shell_init(struct weston_compositor *ec,
+	       int *argc, char *argv[])
+{
+	weston_layer_init(&layer, ec);
+	weston_layer_init(&background_layer, ec);
+
+	weston_layer_set_position(&layer,
+				  WESTON_LAYER_POSITION_NORMAL);
+	weston_layer_set_position(&background_layer,
+				  WESTON_LAYER_POSITION_BACKGROUND);
+
+	background_surface = weston_surface_create(ec);
+	if (background_surface == NULL)
+		return -1;
+	background_view = weston_view_create(background_surface);
+	if (background_view == NULL) {
+		weston_surface_destroy(background_surface);
+		return -1;
+	}
+
+	weston_surface_set_color(background_surface, 0.0, 0.0, 0.0, 1);
+	pixman_region32_fini(&background_surface->opaque);
+	pixman_region32_init_rect(&background_surface->opaque, 0, 0, 2000, 2000);
+	pixman_region32_fini(&background_surface->input);
+	pixman_region32_init_rect(&background_surface->input, 0, 0, 2000, 2000);
+
+	weston_surface_set_size(background_surface, 2000, 2000);
+	weston_view_set_position(background_view, 0, 0);
+	weston_layer_entry_insert(&background_layer.view_list, &background_view->layer_link);
+	weston_view_update_transform(background_view);
+
+	desktop = weston_desktop_create(ec, &shell_desktop_api, NULL);
+	return desktop ? 0 : -1;
+}