From 23722eaeb72778245288e6a4d696902be755ff33 Mon Sep 17 00:00:00 2001
From: Long0x0 <51022287+Long0x0@users.noreply.github.com>
Date: Sun, 25 Aug 2024 17:00:35 +0800
Subject: [PATCH] Fix the flashing problem of the window initialization on
 Windows

---
 src/platform_impl/windows/window.rs | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/platform_impl/windows/window.rs b/src/platform_impl/windows/window.rs
index 30b779f2d2..ad09f6beea 100644
--- a/src/platform_impl/windows/window.rs
+++ b/src/platform_impl/windows/window.rs
@@ -1233,10 +1233,6 @@ impl<'a, T: 'static> InitData<'a, T> {
             win.set_content_protected(true);
         }
 
-        // Set visible before setting the size to ensure the
-        // attribute is correctly applied.
-        win.set_visible(attributes.visible);
-
         win.set_enabled_buttons(attributes.enabled_buttons);
 
         if attributes.fullscreen.0.is_some() {
@@ -1262,6 +1258,18 @@ impl<'a, T: 'static> InitData<'a, T> {
             }
         }
 
+        // Setting visible before setting the size causes black/white flickering;
+        // showing the decorated window directly results in an unpleasant white
+        // background. So here's a hack: set visible on the undecorated window,
+        // then apply the decorations again. The window will remain transparent
+        // until it gets repainted. Changes to flag `SWP_FRAMECHANGED` trigger
+        // `WM_NCCALCSIZE` event.
+        win.set_decorations(false);
+        win.set_undecorated_shadow(false);
+        win.set_visible(attributes.visible);
+        win.set_decorations(attributes.decorations);
+        win.set_undecorated_shadow(self.pl_attribs.decoration_shadow);
+
         // let margins = MARGINS {
         //     cxLeftWidth: 1,
         //     cxRightWidth: 1,