[client] displayserver: move screensaver handling into displayservers

This also makes Wayland idle inhibition respect noScreensaver setting.

client/displayservers/SDL/sdl.c

@@ -222,6 +222,16 @@ static void sdlRealignPointer(void)
   app_handleMouseNormal(0, 0);
 }
 
+static void sdlInhibitIdle(void)
+{
+  SDL_DisableScreenSaver();
+}
+
+static void sdlUninhibitIdle(void)
+{
+  SDL_EnableScreenSaver();
+}
+
 struct LG_DisplayServerOps LGDS_SDL =
 {
   .subsystem      = SDL_SYSWM_UNKNOWN,
@@ -238,6 +248,8 @@ struct LG_DisplayServerOps LGDS_SDL =
   .ungrabKeyboard = sdlUngrabKeyboard,
   .warpPointer    = sdlWarpPointer,
   .realignPointer = sdlRealignPointer,
+  .inhibitIdle    = sdlInhibitIdle,
+  .uninhibitIdle  = sdlUninhibitIdle,
 
   /* SDL does not have clipboard support */
   .cbInit    = NULL,

client/displayservers/Wayland/wayland.c

@@ -206,14 +206,14 @@ static const struct wl_pointer_listener pointerListener = {
   .axis = pointerAxisHandler,
 };
 
-static void inhibitIdle(void)
+static void waylandInhibitIdle(void)
 {
   if (wm.idleInhibitManager && !wm.idleInhibitor)
     wm.idleInhibitor = zwp_idle_inhibit_manager_v1_create_inhibitor(
         wm.idleInhibitManager, wm.surface);
 }
 
-static void uninhibitIdle(void)
+static void waylandUninhibitIdle(void)
 {
   if (wm.idleInhibitor)
   {
@@ -238,14 +238,12 @@ static void keyboardEnterHandler(void * data, struct wl_keyboard * keyboard,
   uint32_t * key;
   wl_array_for_each(key, keys)
     app_handleKeyPress(*key);
-
-  inhibitIdle();
 }
 
 static void keyboardLeaveHandler(void * data, struct wl_keyboard * keyboard,
     uint32_t serial, struct wl_surface * surface)
 {
-  uninhibitIdle();
+  // Do nothing.
 }
 
 static void keyboardKeyHandler(void * data, struct wl_keyboard * keyboard,
@@ -473,7 +471,7 @@ static void waylandFree(void)
 
   if (wm.idleInhibitManager)
   {
-    uninhibitIdle();
+    waylandUninhibitIdle();
     zwp_idle_inhibit_manager_v1_destroy(wm.idleInhibitManager);
   }
 
@@ -862,6 +860,8 @@ struct LG_DisplayServerOps LGDS_Wayland =
   .ungrabKeyboard = waylandUngrabKeyboard,
   .warpPointer    = waylandWarpPointer,
   .realignPointer = waylandRealignPointer,
+  .inhibitIdle    = waylandInhibitIdle,
+  .uninhibitIdle  = waylandUninhibitIdle,
 
   .cbInit    = waylandCBInit,
   .cbNotice  = waylandCBNotice,

client/displayservers/X11/x11.c

@@ -850,6 +850,10 @@ struct LG_DisplayServerOps LGDS_X11 =
   .ungrabKeyboard = x11UngrabKeyboard,
   .warpPointer    = x11WarpPointer,
 
+  /* Use SDL implementation for now */
+  .inhibitIdle    = NULL,
+  .uninhibitIdle  = NULL,
+
   .cbInit    = x11CBInit,
   .cbNotice  = x11CBNotice,
   .cbRelease = x11CBRelease,

client/include/interface/displayserver.h

@@ -100,6 +100,10 @@ struct LG_DisplayServerOps
    * deltas */
   void (*realignPointer)();
 
+  /* called to disable/enable the screensaver */
+  void (*inhibitIdle)();
+  void (*uninhibitIdle)();
+
   /* clipboard support */
   bool (* cbInit)(void);
   void (* cbNotice)(LG_ClipboardData type);

client/src/main.c

@@ -1816,6 +1816,8 @@ static int lg_run(void)
   SET_FALLBACK(ungrabKeyboard);
   SET_FALLBACK(warpPointer);
   SET_FALLBACK(realignPointer);
+  SET_FALLBACK(inhibitIdle);
+  SET_FALLBACK(uninhibitIdle);
   SET_FALLBACK(cbInit);
   SET_FALLBACK(cbNotice);
   SET_FALLBACK(cbRelease);
@@ -1829,8 +1831,8 @@ static int lg_run(void)
     return -1;
   }
 
-  if (!params.noScreensaver)
-    SDL_SetHint(SDL_HINT_VIDEO_ALLOW_SCREENSAVER, "1");
+  // Allow screensavers for now: we will enable and disable as needed.
+  SDL_SetHint(SDL_HINT_VIDEO_ALLOW_SCREENSAVER, "1");
 
   if (SDL_Init(SDL_INIT_VIDEO) < 0)
   {
@@ -1961,6 +1963,9 @@ static int lg_run(void)
   if (!params.center)
     SDL_SetWindowPosition(g_state.window, params.x, params.y);
 
+  if (!params.noScreensaver)
+    g_state.ds->inhibitIdle();
+
   // ensure the initial window size is stored in the state
   SDL_GetWindowSize(g_state.window, &g_state.windowW, &g_state.windowH);