From f16bfe4b1acf1718aeaff311ed23278834a8a17b Mon Sep 17 00:00:00 2001
From: Yuqian Yang <crupest@crupest.life>
Date: Sun, 7 Dec 2025 21:10:18 +0800
Subject: Lower timer priority (including rendering) in SDL.

---
 include/cru/base/Timer.h               | 16 ++++++++++------
 src/platform/gui/sdl/UiApplication.cpp | 33 ++++++++++++++++++++-------------
 src/platform/gui/sdl/Window.cpp        |  2 +-
 3 files changed, 31 insertions(+), 20 deletions(-)

diff --git a/include/cru/base/Timer.h b/include/cru/base/Timer.h
index 5508bccf..52c8386d 100644
--- a/include/cru/base/Timer.h
+++ b/include/cru/base/Timer.h
@@ -30,19 +30,23 @@ class TimerRegistry : public Object {
           repeat(repeat),
           data(std::move(data)) {}
 
+    std::chrono::steady_clock::time_point NextTrigger() const {
+      return interval == std::chrono::milliseconds::zero()
+                 ? last_check
+                 : last_check - (last_check - created) % interval + interval;
+    }
+
     std::chrono::milliseconds NextTimeout(
         std::chrono::steady_clock::time_point now) const {
-      return interval == std::chrono::milliseconds::zero()
+      auto next_trigger = NextTrigger();
+      return now >= next_trigger
                  ? std::chrono::milliseconds::zero()
                  : std::chrono::duration_cast<std::chrono::milliseconds>(
-                       interval - (now - created) % interval);
+                       next_trigger - now);
     }
 
     bool Update(std::chrono::steady_clock::time_point now) {
-      auto next_trigger =
-          interval == std::chrono::milliseconds::zero()
-              ? last_check
-              : last_check - (last_check - created) % interval + interval;
+      auto next_trigger = NextTrigger();
       if (now >= next_trigger) {
         last_check = next_trigger;
         return true;
diff --git a/src/platform/gui/sdl/UiApplication.cpp b/src/platform/gui/sdl/UiApplication.cpp
index edf1e20c..4bcfc5a5 100644
--- a/src/platform/gui/sdl/UiApplication.cpp
+++ b/src/platform/gui/sdl/UiApplication.cpp
@@ -47,29 +47,36 @@ SdlUiApplication::~SdlUiApplication() {
 
 int SdlUiApplication::Run() {
   while (true) {
-    if (auto result = timers_.Update(std::chrono::steady_clock::now())) {
-      result->data();
-      continue;
-    }
-
     auto timeout = timers_.NextTimeout(std::chrono::steady_clock::now());
 
     SDL_Event event;
+    bool has_event = false;
     if (timeout) {
-      SDL_WaitEventTimeout(&event, timeout->count());
+      if (*timeout == std::chrono::milliseconds::zero()) {
+        has_event = SDL_PollEvent(&event);
+      } else {
+        has_event = SDL_WaitEventTimeout(&event, timeout->count());
+      }
     } else {
       CheckSdlReturn(SDL_WaitEvent(&event));
+      has_event = true;
     }
 
-    if (event.type == SDL_EVENT_QUIT) {
-      break;
-    }
+    if (has_event) {
+      if (event.type == SDL_EVENT_QUIT) {
+        break;
+      }
 
-    // char buf[512];
-    // SDL_GetEventDescription(&event, buf, sizeof(buf) / sizeof(*buf));
-    // CruLogDebug(kLogTag, "{}", buf);
+      // char buf[512];
+      // SDL_GetEventDescription(&event, buf, sizeof(buf) / sizeof(*buf));
+      // CruLogDebug(kLogTag, "{}", buf);
 
-    DispatchEvent(event);
+      DispatchEvent(event);
+    } else {
+      if (auto result = timers_.Update(std::chrono::steady_clock::now())) {
+        result->data();
+      }
+    }
 
     delete_later_pool_.Clean();
   }
diff --git a/src/platform/gui/sdl/Window.cpp b/src/platform/gui/sdl/Window.cpp
index 35d33172..44860ae3 100644
--- a/src/platform/gui/sdl/Window.cpp
+++ b/src/platform/gui/sdl/Window.cpp
@@ -280,7 +280,7 @@ void SdlWindow::DoCreateWindow() {
                                          client_rect_.top));
   }
 
-  if (!IsWayland() || !sdl_is_popup_) {
+  if (!sdl_is_popup_) {
     CheckSdlReturn(SDL_SetWindowParent(
         sdl_window_, parent_ == nullptr ? nullptr : parent_->sdl_window_));
   }
-- 
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