1 files changed, 18 insertions, 48 deletions

diff --git a/src/plugins/platforms/qnx/qqnxrasterbackingstore.cpp b/src/plugins/platforms/qnx/qqnxrasterbackingstore.cpp
index 7ae042cb50..c986a960f3 100644
--- a/src/plugins/platforms/qnx/qqnxrasterbackingstore.cpp
+++ b/src/plugins/platforms/qnx/qqnxrasterbackingstore.cpp
@@ -58,7 +58,8 @@ QT_BEGIN_NAMESPACE
 
 QQnxRasterBackingStore::QQnxRasterBackingStore(QWindow *window)
     : QPlatformBackingStore(window),
-      m_hasUnflushedPaintOperations(false)
+      m_needsPosting(false),
+      m_scrolled(false)
 {
     qRasterBackingStoreDebug() << Q_FUNC_INFO << "w =" << window;
 
@@ -85,10 +86,10 @@ void QQnxRasterBackingStore::flush(QWindow *window, const QRegion &region, const
     qRasterBackingStoreDebug() << Q_FUNC_INFO << "w =" << this->window();
 
     // Sometimes this method is called even though there is nothing to be
-    // flushed, for instance, after an expose event directly follows a
-    // geometry change event.
-    if (!m_hasUnflushedPaintOperations)
-            return;
+    // flushed (posted in "screen" parlance), for instance, after an expose
+    // event directly follows a geometry change event.
+    if (!m_needsPosting)
+        return;
 
     QQnxWindow *targetWindow = 0;
     if (window)
@@ -99,25 +100,11 @@ void QQnxRasterBackingStore::flush(QWindow *window, const QRegion &region, const
     // child windows, are performed; conceptually ,child windows have no buffers
     // (actually they do have a 1x1 placeholder buffer due to libscreen limitations),
     // since Qt will only draw to the backing store of the top-level window.
-    if (!targetWindow || targetWindow == platformWindow()) {
+    if (!targetWindow || targetWindow == platformWindow())
+        platformWindow()->post(region);  // update the display with newly rendered content
 
-        // visit all pending scroll operations
-        for (int i = m_scrollOpList.size() - 1; i >= 0; i--) {
-
-            // do the scroll operation
-            ScrollOp &op = m_scrollOpList[i];
-            QRegion srcArea = op.totalArea.intersected( op.totalArea.translated(-op.dx, -op.dy) );
-            platformWindow()->scroll(srcArea, op.dx, op.dy);
-        }
-
-        // clear all pending scroll operations
-        m_scrollOpList.clear();
-
-        // update the display with newly rendered content
-        platformWindow()->post(region);
-    }
-
-    m_hasUnflushedPaintOperations = false;
+    m_needsPosting = false;
+    m_scrolled = false;
 }
 
 void QQnxRasterBackingStore::resize(const QSize &size, const QRegion &staticContents)
@@ -134,31 +121,14 @@ bool QQnxRasterBackingStore::scroll(const QRegion &area, int dx, int dy)
 {
     qRasterBackingStoreDebug() << Q_FUNC_INFO << "w =" << window();
 
-    // calculate entire region affected by scroll operation (src + dst)
-    QRegion totalArea = area.translated(dx, dy);
-    totalArea += area;
-    m_hasUnflushedPaintOperations = true;
-
-    // visit all pending scroll operations
-    for (int i = m_scrollOpList.size() - 1; i >= 0; i--) {
-
-        ScrollOp &op = m_scrollOpList[i];
-        if (op.totalArea == totalArea) {
-            // same area is being scrolled again - update delta
-            op.dx += dx;
-            op.dy += dy;
-            return true;
-        } else if (op.totalArea.intersects(totalArea)) {
-            // current scroll overlaps previous scroll but is
-            // not equal in area - just paint everything
-            qWarning("QQNX: pending scroll operations overlap but not equal");
-            return false;
-        }
-    }
+    m_needsPosting = true;
 
-    // create new scroll operation
-    m_scrollOpList.append( ScrollOp(totalArea, dx, dy) );
-    return true;
+    if (!m_scrolled) {
+        platformWindow()->scroll(area, dx, dy, true);
+        m_scrolled = true;
+        return true;
+    }
+    return false;
 }
 
 void QQnxRasterBackingStore::beginPaint(const QRegion &region)
@@ -166,7 +136,7 @@ void QQnxRasterBackingStore::beginPaint(const QRegion &region)
     Q_UNUSED(region);
 
     qRasterBackingStoreDebug() << Q_FUNC_INFO << "w =" << window();
-    m_hasUnflushedPaintOperations = true;
+    m_needsPosting = true;
 
     platformWindow()->adjustBufferSize();