more logs

The window state may be changed by the window manager without scrcpy
being aware of it (for example the fullscreen mode on macOS).

Check on every "size changed" event whether the fullscreen mode has
changed.

app/src/screen.c

@@ -488,6 +488,9 @@ screen_resize_to_fit(struct screen *screen) {
         return;
     }
 
+    int flags = SDL_GetWindowFlags(screen->window);
+    LOGI("resize to fit (%d 0x%x)", screen->maximized, flags);
+
     if (screen->maximized) {
         SDL_RestoreWindow(screen->window);
         screen->maximized = false;
@@ -496,7 +499,7 @@ screen_resize_to_fit(struct screen *screen) {
     struct size optimal_size =
         get_optimal_window_size(screen, screen->content_size);
     SDL_SetWindowSize(screen->window, optimal_size.width, optimal_size.height);
-    LOGD("Resized to optimal size: %ux%u", optimal_size.width,
+    LOGI("Resized to optimal size: %ux%u", optimal_size.width,
                                            optimal_size.height);
 }
 
@@ -517,20 +520,46 @@ screen_resize_to_pixel_perfect(struct screen *screen) {
                                             content_size.height);
 }
 
+static inline bool
+is_fullscreen(const struct screen *screen) {
+    uint32_t flags = SDL_GetWindowFlags(screen->window);
+    LOGI("flags = 0x%x", flags);
+    return !!(flags & (SDL_WINDOW_FULLSCREEN | SDL_WINDOW_FULLSCREEN_DESKTOP));
+}
+
+static void
+update_fullscreen_state(struct screen *screen) {
+    // There is no SDL event to detect fullscreen changes, so store the
+    // state in a field and compare on every "size changed" event
+    bool fullscreen = is_fullscreen(screen);
+    if (fullscreen != screen->fullscreen) {
+        // Fullscreen state have changed
+        screen->fullscreen = fullscreen;
+        if (!fullscreen && !screen->maximized) {
+            apply_pending_resize(screen);
+        }
+    }
+}
+
 void
 screen_handle_window_event(struct screen *screen,
                            const SDL_WindowEvent *event) {
     switch (event->event) {
         case SDL_WINDOWEVENT_EXPOSED:
+            LOGI("EXPOSED");
             screen_render(screen);
             break;
         case SDL_WINDOWEVENT_SIZE_CHANGED:
+            LOGI("SIZE_CHANGED %dx%d", event->data1, event->data2);
+            //update_fullscreen_state(screen);
             screen_render(screen);
             break;
         case SDL_WINDOWEVENT_MAXIMIZED:
+            LOGI("MAXIMIZED");
             screen->maximized = true;
             break;
         case SDL_WINDOWEVENT_RESTORED:
+            LOGI("RESTORED");
             if (screen->fullscreen) {
                 // On Windows, in maximized+fullscreen, disabling fullscreen
                 // mode unexpectedly triggers the "restored" then "maximized"