feat: support ExternalBeginFrame

.gitignore

@@ -8,4 +8,6 @@ output
 CMakeLists.txt.user
 out
 __pycache__
-obj/
+obj/
+.agent/
+AGENTS.md

src/CCefView/capi/CefBrowser_c.cpp

@@ -103,6 +103,10 @@ void CCefBrowser_setWindowlessFrameRate(ccefbrowser_class * thiz, int rate) {
   thiz->setWindowlessFrameRate(rate);
 }
 
+void CCefBrowser_sendExternalBeginFrame(ccefbrowser_class * thiz) {
+  thiz->sendExternalBeginFrame();
+}
+
 void CCefBrowser_setFocus(ccefbrowser_class * thiz, bool focused) {
   thiz->setFocus(focused);
 }

src/CCefView/capi/CefBrowser_c.h

@@ -54,6 +54,7 @@ extern "C"
   CCEFVIEW_EXPORT void CCefBrowser_setDisablePopupContextMenu(ccefbrowser_class * thiz, bool disable);
   CCEFVIEW_EXPORT bool CCefBrowser_isPopupContextMenuDisabled(ccefbrowser_class * thiz);
   CCEFVIEW_EXPORT void CCefBrowser_setWindowlessFrameRate(ccefbrowser_class * thiz, int rate);
+  CCEFVIEW_EXPORT void CCefBrowser_sendExternalBeginFrame(ccefbrowser_class * thiz);
   CCEFVIEW_EXPORT void CCefBrowser_setFocus(ccefbrowser_class * thiz, bool focused);
   CCEFVIEW_EXPORT void CCefBrowser_wasResized(ccefbrowser_class * thiz);
   CCEFVIEW_EXPORT void CCefBrowser_wasHidden(ccefbrowser_class * thiz, bool hidden);

src/CCefView/include/CefBrowser.h

@@ -1,4 +1,4 @@
-#ifndef CCEFVIEW_H
+#ifndef CCEFVIEW_H
 #define CCEFVIEW_H
 
 #pragma once
@@ -228,6 +228,7 @@ class CCefBrowser
 
 #pragma region Control CEF
   void setWindowlessFrameRate(int rate);
+  void sendExternalBeginFrame();
   void setFocus(bool focused);
   void wasResized();
   void wasHidden(bool hidden);

src/CCefView/source/CefBrowser.cpp

@@ -1,4 +1,4 @@
-#include "CefBrowser.h"
+#include "CefBrowser.h"
 
 #pragma region cef_headers
 #include <include/cef_browser.h>
@@ -33,10 +33,18 @@ CCefBrowser::CCefBrowser(CefBrowserCallback callback, const std::string& url, co
   CefBrowserSettings browserSettings;
   CCefSetting::CopyToCefBrowserSettings(setting, browserSettings);
 
-  // Set window info
+  // Set window info based on configured rendering mode.
   CefWindowInfo window_info;
-  window_info.SetAsWindowless(0);
-  window_info.shared_texture_enabled = (setting && setting->hardwareAcceleration_);
+  bool windowlessRenderingEnabled = false;
+  if (pContext && pContext->cefConfig()) {
+    windowlessRenderingEnabled = pContext->cefConfig()->windowlessRendering();
+  }
+
+  if (windowlessRenderingEnabled) {
+    window_info.SetAsWindowless(0);
+    window_info.shared_texture_enabled = (setting && setting->hardwareAcceleration_);
+    window_info.external_begin_frame_enabled = true;
+  }
 
   if (CefColorGetA(browserSettings.background_color) == 0)
     transparentPaintingEnabled_ = true;
@@ -332,6 +340,19 @@ CCefBrowser::setWindowlessFrameRate(int rate)
   pCefBrowser_->GetHost()->SetWindowlessFrameRate(rate);
 }
 
+void
+CCefBrowser::sendExternalBeginFrame()
+{
+  if (!pCefBrowser_)
+    return;
+
+  auto host = pCefBrowser_->GetHost();
+  if (!host || !host->IsWindowRenderingDisabled())
+    return;
+
+  host->SendExternalBeginFrame();
+}
+
 void
 CCefBrowser::setFocus(bool focused)
 {

src/DNCefView/AutoGen/CefBrowser+AutoGen.cs

@@ -224,6 +224,14 @@ public void SetWindowlessFrameRate(int rate)
             CCefBrowser_setWindowlessFrameRate(_native, rate);
         }
 
+        // Source: void sendExternalBeginFrame()
+        [DllImport("CCefView")]
+        private static extern void CCefBrowser_sendExternalBeginFrame(IntPtr thiz);
+        public void SendExternalBeginFrame()
+        {
+            CCefBrowser_sendExternalBeginFrame(_native);
+        }
+
         // Source: void setFocus(bool)
         [DllImport("CCefView")]
         private static extern void CCefBrowser_setFocus(IntPtr thiz, bool focused);