From 7d300c6e7d05f4e31c966f1298d11da3eae9d679 Mon Sep 17 00:00:00 2001
From: Val Doroshchuk <valentyn.doroshchuk@qt.io>
Date: Fri, 21 Jun 2019 11:24:06 +0200
Subject: [PATCH] ANGLE: Invalidate client window area when resizing swap chain

Inspired by:
https://codereview.appspot.com/6812076/
Resizing a window larger results in the newly exposed region being invalidated
but the old region is treated as valid.
This can result in the old region no longer updating.
Was added to D3D9.

Improving a fix from Filippo Cucchetto:
https://codereview.qt-project.org/c/qt/qtbase/+/195336
and pushing to D3D11.

ifndef protects against compilation error for WinRT.
Invalidate() should be used only for desktop apps.

diff --git a/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp b/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
index dcfd06484d..e8f13b388f 100644
--- a/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
+++ b/src/3rdparty/angle/src/libANGLE/renderer/d3d/d3d11/SwapChain11.cpp
@@ -504,6 +504,10 @@ EGLint SwapChain11::resize(const gl::Context *context,
     ASSERT(SUCCEEDED(result));
     if (SUCCEEDED(result))
     {
+#ifndef ANGLE_ENABLE_WINDOWS_STORE
+        if (mNativeWindow->getNativeWindow())
+            InvalidateRect(mNativeWindow->getNativeWindow(), nullptr, FALSE);
+#endif
         const auto &format =
             d3d11::Format::Get(mOffscreenRenderTargetFormat, mRenderer->getRenderer11DeviceCaps());
         mBackBufferTexture.set(backbufferTexture, format);
-- 
2.14.2.windows.1