void DrawingAreaProxyImpl::didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo& updateInfo, const LayerTreeContext& layerTreeContext)
{
ASSERT_ARG(backingStoreStateID, backingStoreStateID <= m_nextBackingStoreStateID);
ASSERT_ARG(backingStoreStateID, backingStoreStateID > m_currentBackingStoreStateID);
m_currentBackingStoreStateID = backingStoreStateID;
m_isWaitingForDidUpdateBackingStoreState = false;
if (m_nextBackingStoreStateID != m_currentBackingStoreStateID)
sendUpdateBackingStoreState(RespondImmediately);
#if USE(ACCELERATED_COMPOSITING)
if (layerTreeContext != m_layerTreeContext) {
if (!m_layerTreeContext.isEmpty()) {
exitAcceleratedCompositingMode();
ASSERT(m_layerTreeContext.isEmpty());
}
if (!layerTreeContext.isEmpty()) {
enterAcceleratedCompositingMode(layerTreeContext);
ASSERT(layerTreeContext == m_layerTreeContext);
}
}
if (isInAcceleratedCompositingMode()) {
ASSERT(!m_backingStore);
return;
}
#endif
// FIXME: We could just reuse our existing backing store if it's the same size as
// updateInfo.viewSize.
m_backingStore = nullptr;
incorporateUpdate(updateInfo);
}
void DrawingAreaProxyImpl::didUpdateBackingStoreState(uint64_t backingStoreStateID, const UpdateInfo& updateInfo, const LayerTreeContext& layerTreeContext)
{
ASSERT_ARG(backingStoreStateID, backingStoreStateID <= m_nextBackingStoreStateID);
ASSERT_ARG(backingStoreStateID, backingStoreStateID > m_currentBackingStoreStateID);
m_currentBackingStoreStateID = backingStoreStateID;
m_isWaitingForDidUpdateBackingStoreState = false;
// Stop the responsiveness timer that was started in sendUpdateBackingStoreState.
m_webPageProxy->process()->responsivenessTimer()->stop();
#if USE(ACCELERATED_COMPOSITING)
if (layerTreeContext != m_layerTreeContext) {
if (!m_layerTreeContext.isEmpty()) {
exitAcceleratedCompositingMode();
ASSERT(m_layerTreeContext.isEmpty());
}
if (!layerTreeContext.isEmpty()) {
enterAcceleratedCompositingMode(layerTreeContext);
ASSERT(layerTreeContext == m_layerTreeContext);
}
}
#endif
if (m_nextBackingStoreStateID != m_currentBackingStoreStateID)
sendUpdateBackingStoreState(RespondImmediately);
else
m_hasReceivedFirstUpdate = true;
#if USE(ACCELERATED_COMPOSITING)
if (isInAcceleratedCompositingMode()) {
ASSERT(!m_backingStore);
return;
}
#else
UNUSED_PARAM(layerTreeContext);
#endif
// If we have a backing store the right size, reuse it.
if (m_backingStore && (m_backingStore->size() != updateInfo.viewSize || m_backingStore->deviceScaleFactor() != updateInfo.deviceScaleFactor))
m_backingStore = nullptr;
incorporateUpdate(updateInfo);
}
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::backingStoreStateDidChange(RespondImmediatelyOrNot respondImmediatelyOrNot)
{
++m_nextBackingStoreStateID;
sendUpdateBackingStoreState(respondImmediatelyOrNot);
}
