1 files changed, 2 insertions, 24 deletions
diff --git a/src/gui/painting/qpaintengine_raster.cpp b/src/gui/painting/qpaintengine_raster.cpp
index 97fde57106..322bff9b57 100644
--- a/src/gui/painting/qpaintengine_raster.cpp
+++ b/src/gui/painting/qpaintengine_raster.cpp
@@ -407,36 +407,14 @@ void QRasterPaintEngine::init()
     case QImage::Format_Mono:
         d->mono_surface = true;
         break;
-    case QImage::Format_ARGB8565_Premultiplied:
-    case QImage::Format_ARGB8555_Premultiplied:
-    case QImage::Format_ARGB6666_Premultiplied:
-    case QImage::Format_ARGB4444_Premultiplied:
-    case QImage::Format_ARGB32_Premultiplied:
-    case QImage::Format_ARGB32:
-    case QImage::Format_RGBA8888_Premultiplied:
-    case QImage::Format_RGBA8888:
-    case QImage::Format_A2BGR30_Premultiplied:
-    case QImage::Format_A2RGB30_Premultiplied:
-        gccaps |= PorterDuff;
-        break;
-    case QImage::Format_RGB32:
-    case QImage::Format_RGB444:
-    case QImage::Format_RGB555:
-    case QImage::Format_RGB666:
-    case QImage::Format_RGB888:
-    case QImage::Format_RGB16:
-    case QImage::Format_RGBX8888:
-    case QImage::Format_BGR30:
-    case QImage::Format_RGB30:
-        break;
     default:
+        if (QImage::toPixelFormat(format).alphaUsage() == QPixelFormat::UsesAlpha)
+            gccaps |= PorterDuff;
         break;
     }
 }
 
 
-
-
 /*!
     Destroys this paint engine.
 */