Added an option for ignoring the system clip

This is currently the only way I can make QGraphicsView not have to fall
back to the raster engine for all operations. It seems the QRegion
passed to the paintEvent of QGraphicsView also is set as the systemClip
which in the end makes the QRasterPaintEngine's clipRegion equal the
systemClip. By exporting QWS_DISPLAY=directfb:ignoresystemclip you can
now draw without having a complex clip and therefore take advantage of
hw acceleration with DirectFB.

Reviewed-By: Donald <qt-info@nokia.com>

3 files changed, 23 insertions, 10 deletions

diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
index c4dae2e40c..101c4b7fa6 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
@@ -337,6 +337,7 @@ private:
 
     bool dirtyClip;
     bool dfbHandledClip;
+    bool ignoreSystemClip;
     QDirectFBPaintDevice *dfbDevice;
 
     QDirectFBPaintEngine *q;
@@ -350,6 +351,7 @@ QDirectFBPaintEnginePrivate::QDirectFBPaintEnginePrivate(QDirectFBPaintEngine *p
       dfbHandledClip(false), dfbDevice(0), q(p)
 {
     fb = QDirectFBScreen::instance()->dfb();
+    ignoreSystemClip = QDirectFBScreen::instance()->ignoreSystemClip();
     surfaceCache = new SurfaceCache;
     static int cacheLimit = qgetenv("QT_DIRECTFB_IMAGECACHE").toInt();
     if (cacheLimit > 0)
@@ -774,23 +776,24 @@ void QDirectFBPaintEnginePrivate::updateClip()
     if (!dirtyClip)
         return;
 
-    if (!clip() || !clip()->enabled) {
+    const QClipData *clipData = clip();
+    if (!clipData || !clipData->enabled) {
         surface->SetClip(surface, NULL);
         dfbHandledClip = true;
-    }
-    else if (clip()->hasRectClip) {
+    } else if (clipData->hasRectClip) {
         const DFBRegion r = {
-            clip()->clipRect.x(),
-            clip()->clipRect.y(),
-            clip()->clipRect.x() + clip()->clipRect.width(),
-            clip()->clipRect.y() + clip()->clipRect.height()
+            clipData->clipRect.x(),
+            clipData->clipRect.y(),
+            clipData->clipRect.x() + clipData->clipRect.width(),
+            clipData->clipRect.y() + clipData->clipRect.height()
         };
         surface->SetClip(surface, &r);
-
         dfbHandledClip = true;
-    }
-    else
+    } else if (clipData->hasRegionClip && ignoreSystemClip && clipData->clipRegion == systemClip) {
+        dfbHandledClip = true;
+    } else {
         dfbHandledClip = false;
+    }
 
     dirtyClip = false;
 }
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
index 3e54e7f57d..177df1d809 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.cpp
@@ -81,6 +81,7 @@ public:
     QDirectFBKeyboardHandler *keyboard;
 #endif
     bool videoonly;
+    bool ignoreSystemClip;
     QImage::Format alphaPixmapFormat;
 };
 
@@ -97,6 +98,7 @@ QDirectFBScreenPrivate::QDirectFBScreenPrivate(QDirectFBScreen* screen)
     , keyboard(0)
 #endif
     , videoonly(false)
+    , ignoreSystemClip(false)
     , alphaPixmapFormat(QImage::Format_Invalid)
 {
 #ifndef QT_NO_QWS_SIGNALHANDLER
@@ -826,6 +828,9 @@ bool QDirectFBScreen::connect(const QString &displaySpec)
     if (displayArgs.contains(QLatin1String("videoonly")))
         d_ptr->videoonly = true;
 
+    if (displayArgs.contains(QLatin1String("ignoresystemclip"), Qt::CaseInsensitive))
+        d_ptr->ignoreSystemClip = true;
+
 #ifndef QT_NO_DIRECTFB_WM
     if (displayArgs.contains(QLatin1String("fullscreen")))
 #endif
@@ -1256,3 +1261,7 @@ uchar *QDirectFBScreen::lockSurface(IDirectFBSurface *surface, DFBSurfaceLockFla
     return reinterpret_cast<uchar*>(mem);
 }
 
+bool QDirectFBScreen::ignoreSystemClip() const
+{
+    return d_ptr->ignoreSystemClip;
+}
diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
index 8dd38dc6a4..08c9ac184c 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbscreen.h
@@ -109,6 +109,7 @@ public:
     void releaseDFBSurface(IDirectFBSurface* surface);
 
     bool preferVideoOnly() const;
+    bool ignoreSystemClip() const;
 
     static int depth(DFBSurfacePixelFormat format);