Introduce FontSmoothingGamma as a platform style hint.

- Allocate gamma tables on the heap in a thread-safe way, use
  font smoothing returned by the style hints of the platform to
  calculate them.
- Improve font rendering on Windows.

Change-Id: I8cd39b51cf03cbd642474c02b9076814baecd597
Reviewed-by: Samuel Rødal <samuel.rodal@nokia.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/qwindowsintegration.cpp b/src/plugins/platforms/windows/qwindowsintegration.cpp
index ee58a19ca9..fa63d77dd7 100644
--- a/src/plugins/platforms/windows/qwindowsintegration.cpp
+++ b/src/plugins/platforms/windows/qwindowsintegration.cpp
@@ -317,6 +317,8 @@ QVariant QWindowsIntegration::styleHint(QPlatformIntegration::StyleHint hint) co
     case QPlatformIntegration::KeyboardInputInterval:
     case QPlatformIntegration::ShowIsFullScreen:
         break; // Not implemented
+    case QPlatformIntegration::FontSmoothingGamma:
+        return QVariant(QWindowsFontDatabase::fontSmoothingGamma());
     }
     return QPlatformIntegration::styleHint(hint);
 }