--- a/src/3rdparty/webkit/WebCore/page/FrameView.cpp Fri Apr 16 15:50:13 2010 +0300
+++ b/src/3rdparty/webkit/WebCore/page/FrameView.cpp Mon May 03 13:17:34 2010 +0300
@@ -106,6 +106,7 @@
FrameView::FrameView(Frame* frame)
: m_frame(frame)
, m_slowRepaintObjectCount(0)
+ , m_fixedObjectCount(0)
, m_layoutTimer(this, &FrameView::layoutTimerFired)
, m_layoutRoot(0)
, m_postLayoutTasksTimer(this, &FrameView::postLayoutTimerFired)
@@ -735,7 +736,7 @@
bool FrameView::useSlowRepaints() const
{
- return m_useSlowRepaints || m_slowRepaintObjectCount > 0 || m_isOverlapped || !m_contentIsOpaque;
+ return m_useSlowRepaints || m_slowRepaintObjectCount > 0 || (platformWidget() && m_fixedObjectCount > 0) || m_isOverlapped || !m_contentIsOpaque;
}
void FrameView::setUseSlowRepaints()
@@ -759,6 +760,78 @@
setCanBlitOnScroll(!useSlowRepaints());
}
+void FrameView::addFixedObject()
+{
+ if (!m_fixedObjectCount && platformWidget())
+ setCanBlitOnScroll(false);
+ ++m_fixedObjectCount;
+}
+
+void FrameView::removeFixedObject()
+{
+ ASSERT(m_fixedObjectCount > 0);
+ m_fixedObjectCount--;
+ if (!m_fixedObjectCount)
+ setCanBlitOnScroll(!useSlowRepaints());
+}
+
+void FrameView::scrollContentsFastPath(const IntSize& scrollDelta, const IntRect& rectToScroll, const IntRect& clipRect)
+{
+ const size_t fixedObjectThreshold = 5;
+
+ ListHashSet<RenderBox*>* positionedObjects = 0;
+ if (RenderView* root = m_frame->contentRenderer())
+ positionedObjects = root->positionedObjects();
+
+ if (!positionedObjects || positionedObjects->isEmpty()) {
+ hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
+ return;
+ }
+
+ // Get the rects of the fixed objects visible in the rectToScroll
+ Vector<IntRect, fixedObjectThreshold> subRectToUpdate;
+ bool updateInvalidatedSubRect = true;
+ ListHashSet<RenderBox*>::const_iterator end = positionedObjects->end();
+ for (ListHashSet<RenderBox*>::const_iterator it = positionedObjects->begin(); it != end; ++it) {
+ RenderBox* renderBox = *it;
+ if (renderBox->style()->position() != FixedPosition)
+ continue;
+ IntRect topLevelRect;
+ IntRect updateRect = renderBox->paintingRootRect(topLevelRect);
+ updateRect.move(-scrollX(), -scrollY());
+ updateRect.intersect(rectToScroll);
+ if (!updateRect.isEmpty()) {
+ if (subRectToUpdate.size() >= fixedObjectThreshold) {
+ updateInvalidatedSubRect = false;
+ break;
+ }
+ subRectToUpdate.append(updateRect);
+ }
+ }
+
+ // Scroll the view
+ if (updateInvalidatedSubRect) {
+ // 1) scroll
+ hostWindow()->scroll(scrollDelta, rectToScroll, clipRect);
+
+ // 2) update the area of fixed objets that has been invalidated
+ size_t fixObjectsCount = subRectToUpdate.size();
+ for (size_t i = 0; i < fixObjectsCount; ++i) {
+ IntRect updateRect = subRectToUpdate[i];
+ IntRect scrolledRect = updateRect;
+ scrolledRect.move(scrollDelta);
+ updateRect.unite(scrolledRect);
+ updateRect.intersect(rectToScroll);
+ hostWindow()->repaint(updateRect, true, false, true);
+ }
+ } else {
+ // the number of fixed objects exceed the threshold, so we repaint everything.
+ IntRect updateRect = clipRect;
+ updateRect.intersect(rectToScroll);
+ hostWindow()->repaint(updateRect, true, false, true);
+ }
+}
+
void FrameView::setIsOverlapped(bool isOverlapped)
{
if (isOverlapped == m_isOverlapped)