direct2d: Work around ClearType rendering bug in translucent mode

This switches the font rendering to use gray scale antialiasing when in
translucent rendering mode. It does so by adding a flags argument to the
paint engine, allowing for future expansion in communicating render hints
from the device to the engine.

Task-number: QTBUG-41002
Change-Id: I0265154716a12060e851b603a109e9c693f5e843
Reviewed-by: Louai Al-Khanji <louai.al-khanji@digia.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@digia.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/src/plugins/platforms/direct2d/qwindowsdirect2dpaintdevice.cpp b/src/plugins/platforms/direct2d/qwindowsdirect2dpaintdevice.cpp
index f5f4923b2f..4bbe74b642 100644
--- a/src/plugins/platforms/direct2d/qwindowsdirect2dpaintdevice.cpp
+++ b/src/plugins/platforms/direct2d/qwindowsdirect2dpaintdevice.cpp
@@ -53,8 +53,9 @@ QT_BEGIN_NAMESPACE
 class QWindowsDirect2DPaintDevicePrivate
 {
 public:
-    QWindowsDirect2DPaintDevicePrivate(QWindowsDirect2DBitmap *bitmap, QInternal::PaintDeviceFlags f)
-        : engine(new QWindowsDirect2DPaintEngine(bitmap))
+    QWindowsDirect2DPaintDevicePrivate(QWindowsDirect2DBitmap *bitmap, QInternal::PaintDeviceFlags f,
+                                       QWindowsDirect2DPaintEngine::Flags paintFlags)
+        : engine(new QWindowsDirect2DPaintEngine(bitmap, paintFlags))
         , bitmap(bitmap)
         , flags(f)
     {}
@@ -64,8 +65,9 @@ public:
     QInternal::PaintDeviceFlags flags;
 };
 
-QWindowsDirect2DPaintDevice::QWindowsDirect2DPaintDevice(QWindowsDirect2DBitmap *bitmap, QInternal::PaintDeviceFlags flags)
-    : d_ptr(new QWindowsDirect2DPaintDevicePrivate(bitmap, flags))
+QWindowsDirect2DPaintDevice::QWindowsDirect2DPaintDevice(QWindowsDirect2DBitmap *bitmap, QInternal::PaintDeviceFlags flags,
+                                                         QWindowsDirect2DPaintEngine::Flags paintFlags)
+    : d_ptr(new QWindowsDirect2DPaintDevicePrivate(bitmap, flags, paintFlags))
 {
 }