High-dpi configuration change testing

Export configuration() and setConfiguration() from the offscreen
platform plugin using QPlatformNativeInterface. tst_qighdpi can
then resolve and make use of them since it always uses the offscreen
platform plugin.

Add screenDpiChange() auto test.

Change-Id: I459b4df5d94ec4991234a346e3a94618cb3485e9
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>

1 files changed, 32 insertions, 0 deletions

diff --git a/src/plugins/platforms/offscreen/qoffscreencommon.cpp b/src/plugins/platforms/offscreen/qoffscreencommon.cpp
index 29e2cc417d..f485b4eed8 100644
--- a/src/plugins/platforms/offscreen/qoffscreencommon.cpp
+++ b/src/plugins/platforms/offscreen/qoffscreencommon.cpp
@@ -236,6 +236,38 @@ void QOffscreenBackingStore::clearHash()
 
 QHash<WId, QOffscreenBackingStore *> QOffscreenBackingStore::m_backingStoreForWinIdHash;
 
+QOffscreenPlatformNativeInterface::QOffscreenPlatformNativeInterface(QOffscreenIntegration *integration)
+    : m_integration(integration)
+{
+
+}
+
 QOffscreenPlatformNativeInterface::~QOffscreenPlatformNativeInterface() = default;
 
+/*
+    Set platform configuration, e.g. screen configuration
+*/
+void QOffscreenPlatformNativeInterface::setConfiguration(const QJsonObject &configuration, QOffscreenPlatformNativeInterface *iface)
+{
+    iface->m_integration->setConfiguration(configuration);
+}
+
+/*
+    Get the current platform configuration
+*/
+QJsonObject QOffscreenPlatformNativeInterface::configuration(QOffscreenPlatformNativeInterface *iface)
+{
+    return iface->m_integration->configuration();
+}
+
+void *QOffscreenPlatformNativeInterface::nativeResourceForIntegration(const QByteArray &resource)
+{
+    if (resource == "setConfiguration")
+        return reinterpret_cast<void*>(&QOffscreenPlatformNativeInterface::setConfiguration);
+    else if (resource == "configuration")
+        return reinterpret_cast<void*>(&QOffscreenPlatformNativeInterface::configuration);
+    else
+        return nullptr;
+}
+
 QT_END_NAMESPACE