void DrawingAreaProxyImpl::sendUpdateBackingStoreState(RespondImmediatelyOrNot respondImmediatelyOrNot)
{
ASSERT(m_currentBackingStoreStateID < m_nextBackingStoreStateID);
if (!m_webPageProxy->isValid())
return;
if (m_isWaitingForDidUpdateBackingStoreState)
return;
if (m_webPageProxy->viewSize().isEmpty() && !m_webPageProxy->useFixedLayout())
return;
m_isWaitingForDidUpdateBackingStoreState = respondImmediatelyOrNot == RespondImmediately;
m_webPageProxy->process()->send(Messages::DrawingArea::UpdateBackingStoreState(m_nextBackingStoreStateID, respondImmediatelyOrNot == RespondImmediately, m_webPageProxy->deviceScaleFactor(), m_size, m_scrollOffset), m_webPageProxy->pageID());
m_scrollOffset = IntSize();
if (m_isWaitingForDidUpdateBackingStoreState) {
// Start the responsiveness timer. We will stop it when we hear back from the WebProcess
// in didUpdateBackingStoreState.
m_webPageProxy->process()->responsivenessTimer()->start();
}
#if USE(ACCELERATED_COMPOSITING)
if (m_isWaitingForDidUpdateBackingStoreState && !m_layerTreeContext.isEmpty()) {
// Wait for the DidUpdateBackingStoreState message. Normally we do this in DrawingAreaProxyImpl::paint, but that
// function is never called when in accelerated compositing mode.
waitForAndDispatchDidUpdateBackingStoreState();
}
#endif
}
void DrawingAreaProxyImpl::paint(BackingStore::PlatformGraphicsContext context, const IntRect& rect, Region& unpaintedRegion)
{
unpaintedRegion = rect;
if (isInAcceleratedCompositingMode())
return;
ASSERT(m_currentBackingStoreStateID <= m_nextBackingStoreStateID);
if (m_currentBackingStoreStateID < m_nextBackingStoreStateID) {
// Tell the web process to do a full backing store update now, in case we previously told
// it about our next state but didn't request an immediate update.
sendUpdateBackingStoreState(RespondImmediately);
// If we haven't yet received our first bits from the WebProcess then don't paint anything.
if (!m_hasReceivedFirstUpdate)
return;
if (m_isWaitingForDidUpdateBackingStoreState) {
// Wait for a DidUpdateBackingStoreState message that contains the new bits before we paint
// what's currently in the backing store.
waitForAndDispatchDidUpdateBackingStoreState();
}
// Dispatching DidUpdateBackingStoreState (either beneath sendUpdateBackingStoreState or
// beneath waitForAndDispatchDidUpdateBackingStoreState) could destroy our backing store or
// change the compositing mode.
if (!m_backingStore || isInAcceleratedCompositingMode())
return;
} else {
ASSERT(!m_isWaitingForDidUpdateBackingStoreState);
if (!m_backingStore) {
// The view has asked us to paint before the web process has painted anything. There's
// nothing we can do.
return;
}
}
m_backingStore->paint(context, rect);
unpaintedRegion.subtract(IntRect(IntPoint(), m_backingStore->size()));
discardBackingStoreSoon();
}
void DrawingAreaProxyImpl::sendUpdateBackingStoreState(RespondImmediatelyOrNot respondImmediatelyOrNot)
{
ASSERT(m_currentBackingStoreStateID < m_nextBackingStoreStateID);
if (!m_webPageProxy->isValid())
return;
if (m_isWaitingForDidUpdateBackingStoreState)
return;
m_isWaitingForDidUpdateBackingStoreState = respondImmediatelyOrNot == RespondImmediately;
m_webPageProxy->process()->send(Messages::DrawingArea::UpdateBackingStoreState(m_nextBackingStoreStateID, respondImmediatelyOrNot == RespondImmediately, m_size, m_scrollOffset), m_webPageProxy->pageID());
m_scrollOffset = IntSize();
#if USE(ACCELERATED_COMPOSITING)
if (m_isWaitingForDidUpdateBackingStoreState && !m_layerTreeContext.isEmpty()) {
// Wait for the DidUpdateBackingStoreState message. Normally we don this in DrawingAreaProxyImpl::paint, but that
// function is never called when in accelerated compositing mode.
waitForAndDispatchDidUpdateBackingStoreState();
}
#endif
}
