From 7c5f2a9393a3fc77c0c5b2406332d57a37325183 Mon Sep 17 00:00:00 2001
From: Alexandru Croitor <alexandru.croitor@theqtcompany.com>
Date: Mon, 7 Dec 2015 08:51:58 +0100
Subject: [PATCH] Fix incorrect device pixel ratio used on startup.
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Report the correct device pixel ratio to Chromium, when the
QOpenGLWidget gets initialized. The initial value on startup is
incorrect, because Chromium tries to query the screen information,
before a relevant QWindow handle can be returned, and thus defaults to
1.0f.
Change-Id: Ibbedd7b2915840f9716340e582aedbc13406f11a
Task-number: QTBUG-49727
Reviewed-by: Michael Brüning <michael.bruning@theqtcompany.com>
---
.../render_widget_host_view_qt_delegate_widget.cpp | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
index dba37cea7..3d7237367 100644
--- a/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
+++ b/src/webenginewidgets/render_widget_host_view_qt_delegate_widget.cpp
@@ -271,6 +271,12 @@ void RenderWidgetHostViewQtDelegateWidget::initializeGL()
m_sgRenderer.reset(m_sgEngine->createRenderer());
m_sgRenderer->setRootNode(m_rootNode.data());
m_sgRenderer->setClearColor(Qt::white);
+
+ // When RenderWidgetHostViewQt::GetScreenInfo is called for the first time, the associated
+ // QWindow is NULL, and the screen device pixel ratio can not be queried.
+ // Re-initialize the screen information after the QWindow handle is available,
+ // so Chromium receives the correct device pixel ratio.
+ m_client->windowChanged();
}
void RenderWidgetHostViewQtDelegateWidget::paintGL()
--
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