direct2d: Fix window resize with translucent windows

If the size of the window has changed, the backing bitmap should be
reset with the new geometry.

Change-Id: I1ca430cd7b5df1845b4fef31f5bf8f05d889a2fc
Reviewed-by: Louai Al-Khanji <louai.al-khanji@theqtcompany.com>

1 files changed, 4 insertions, 5 deletions

diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.cpp b/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.cpp
index ef02d77375..c89d293d1d 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.cpp
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dwindow.cpp
@@ -199,12 +199,13 @@ void QWindowsDirect2DWindow::setupSwapChain()
 
 void QWindowsDirect2DWindow::resizeSwapChain(const QSize &size)
 {
-    if (!m_swapChain)
-        return;
-
     m_pixmap.reset();
     m_bitmap.reset();
     m_deviceContext->SetTarget(Q_NULLPTR);
+    m_needsFullFlush = true;
+
+    if (!m_swapChain)
+        return;
 
     HRESULT hr = m_swapChain->ResizeBuffers(0,
                                             size.width(), size.height(),
@@ -212,8 +213,6 @@ void QWindowsDirect2DWindow::resizeSwapChain(const QSize &size)
                                             0);
     if (FAILED(hr))
         qWarning("%s: Could not resize swap chain: %#x", __FUNCTION__, hr);
-
-    m_needsFullFlush = true;
 }
 
 QSharedPointer<QWindowsDirect2DBitmap> QWindowsDirect2DWindow::copyBackBuffer() const