From 09aba1d41693a406f9ba8866afface28ccec8925 Mon Sep 17 00:00:00 2001
From: justnullname <51329027+justnullname@users.noreply.github.com>
Date: Fri, 27 Mar 2026 15:42:57 +0000
Subject: [PATCH] Fix image center flash during window resize on zoom

Added DwmFlush() immediately after g_compEngine->Commit() in OnResize and WM_SIZE. This synchronizes the DirectComposition hardware transform submission with the Win32 WM_SIZE vsync, preventing a one-frame screen tearing/flickering issue where the window size was updated but the DirectComposition visual tree was not yet committed.
---
 QuickView/main.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/QuickView/main.cpp b/QuickView/main.cpp
index ad60691..c086dde 100644
--- a/QuickView/main.cpp
+++ b/QuickView/main.cpp
@@ -6142,6 +6142,10 @@ LRESULT CALLBACK WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
                 // [Refactor] Use Centralized SyncDCompState
                 RECT rc; GetClientRect(hwnd, &rc);
                 SyncDCompState(hwnd, (float)rc.right, (float)rc.bottom);
+                if (g_compEngine) {
+                    g_compEngine->Commit();
+                    DwmFlush();
+                }
             }
 
             
@@ -8835,6 +8839,7 @@ void OnResize(HWND hwnd, UINT width, UINT height) {
             SyncDCompState(hwnd, (float)width, (float)height);
         }
         g_compEngine->Commit();
+        DwmFlush();
     }
     if (g_uiRenderer) g_uiRenderer->OnResize(width, height);
     g_toolbar.UpdateLayout((float)width, (float)height);