Let yasl_app_desc describe its initial window

A new optional yasl_app_desc.window spec makes yasl_run() create that
toplevel and request its first frame before init(), which is now
optional too. If creation fails, yasl_run() closes the display and
returns an error without calling init().

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/tests/common/test_app.c b/tests/common/test_app.c
index 6972921..f61a957 100644
--- a/tests/common/test_app.c
+++ b/tests/common/test_app.c
@@ -109,6 +109,29 @@ static void on_quit(void *ud, struct yasl_display *d)
     state->quit_called = true;
 }
 
+static void present_once(void *ud, struct yasl_surface *s, struct yasl_frame_context *ctx)
+{
+    (*(int *)ud)++;
+    if (ctx->cpu.pixels)
+        assert(yasl_frame_present_cpu(ctx, NULL, 0));
+    yasl_surface_destroy(s);
+}
+
+/* desc.window replaces init: the runner creates the toplevel and draws it. */
+static void test_window_without_init(void)
+{
+    int frames = 0;
+    struct yasl_window_spec window = {.title = "App Runner Window", .size = {160, 120}};
+    int res = yasl_run(&(struct yasl_app_desc){
+        .app_id = "org.yasl.test.app.window",
+        .userdata = &frames,
+        .window = &window,
+        .frame = present_once,
+    });
+    assert(res == 0);
+    assert(frames == 1);
+}
+
 int main(void)
 {
     struct test_state state = {0};
@@ -129,6 +152,7 @@ int main(void)
     assert(state.user_event_called);
     assert(state.timer_called);
     assert(state.quit_called);
+    test_window_without_init();
     printf("App runner tests passed!\n");
     return 0;
 }