1 files changed, 30 insertions, 7 deletions

diff --git a/src/gui/embedded/qscreen_qws.cpp b/src/gui/embedded/qscreen_qws.cpp
index cfce78c..fafa35d 100644
--- a/src/gui/embedded/qscreen_qws.cpp
+++ b/src/gui/embedded/qscreen_qws.cpp
@@ -49,6 +49,7 @@
 #include "qpixmap.h"
 #include "qvarlengtharray.h"
 #include "qwsdisplay_qws.h"
+#include "qpainter.h"
 #include <private/qdrawhelper_p.h>
 #include <private/qpaintengine_raster_p.h>
 #include <private/qpixmap_raster_p.h>
@@ -180,7 +181,27 @@ void QScreenCursor::set(const QImage &image, int hotx, int hoty)
     const QRect r = boundingRect();
 
     hotspot = QPoint(hotx, hoty);
-    cursor = image;
+    // These are in almost all cases the fastest formats to blend
+    QImage::Format f;
+    switch (qt_screen->depth()) {
+    case 12:
+        f = QImage::Format_ARGB4444_Premultiplied;
+        break;
+    case 15:
+        f =  QImage::Format_ARGB8555_Premultiplied;
+        break;
+    case 16:
+        f = QImage::Format_ARGB8565_Premultiplied;
+        break;
+    case 18:
+        f = QImage::Format_ARGB6666_Premultiplied;
+        break;
+    default:
+        f =  QImage::Format_ARGB32_Premultiplied;
+    }
+
+    cursor = image.convertToFormat(f);
+
     size = image.size();
 
     if (enable && !hwaccel)
@@ -198,10 +219,12 @@ void QScreenCursor::set(const QImage &image, int hotx, int hoty)
 */
 void QScreenCursor::move(int x, int y)
 {
-    const QRegion r = boundingRect();
+    QRegion r = boundingRect();
     pos = QPoint(x,y);
-    if (enable && !hwaccel)
-        qt_screen->exposeRegion(r | boundingRect(), 0);
+    if (enable && !hwaccel) {
+        r |= boundingRect();
+        qt_screen->exposeRegion(r, 0);
+    }
 }
 
 
@@ -2417,7 +2440,7 @@ void QScreen::exposeRegion(QRegion r, int windowIndex)
 #endif
     compose(0, r, blendRegion, &blendBuffer, changing);
 
-    if (blendBuffer) {
+    if (blendBuffer && !blendBuffer->isNull()) {
         const QPoint offset = blendRegion.boundingRect().topLeft();
 #ifndef QT_NO_QWS_CURSOR
         if (qt_screencursor && !qt_screencursor->isAccelerated()) {
@@ -2708,7 +2731,7 @@ void QScreen::compose(int level, const QRegion &exposed, QRegion &blend,
             default:
                 break;
             }
-            spanData.setup(qwsServer->backgroundBrush(), 256);
+            spanData.setup(qwsServer->backgroundBrush(), 256, QPainter::CompositionMode_SourceOver);
             spanData.dx = off.x();
             spanData.dy = off.y();
         } else if (!surface->isBuffered()) {
@@ -2773,7 +2796,7 @@ void QScreen::paintBackground(const QRegion &r)
         rb.prepare(&img);
         QSpanData spanData;
         spanData.init(&rb, 0);
-        spanData.setup(bg, 256);
+        spanData.setup(bg, 256, QPainter::CompositionMode_Source);
         spanData.dx = off.x();
         spanData.dy = off.y();
         Q_ASSERT(spanData.blend);