Slimming Paint phase 2 compositing algorithm plumbing & skeleton display list API.

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 11 matching lines @@
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/frame/FrameView.h"
 
 #include "core/HTMLNames.h"
 #include "core/MediaTypeNames.h"
+#include "core/compositing/DisplayListCompositingBuilder.h"
 #include "core/css/FontFaceSet.h"
 #include "core/css/resolver/StyleResolver.h"
 #include "core/dom/AXObjectCache.h"
 #include "core/dom/DocumentMarkerController.h"
 #include "core/dom/Fullscreen.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/RenderedPosition.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/fetch/ResourceLoadPriorityOptimizer.h"
 #include "core/frame/FrameHost.h"
@@ skipping 2409 matching lines @@
 void FrameView::updateAllLifecyclePhases()
 {
     frame().localFrameRoot()->view()->updateAllLifecyclePhasesInternal();
 }
 
 // TODO(chrishtr): add a scrolling update lifecycle phase, after compositing and before invalidation.
 void FrameView::updateLifecycleToCompositingCleanPlusScrolling()
 {
     frame().localFrameRoot()->view()->updateStyleAndLayoutIfNeededRecursive();
     LayoutView* view = layoutView();
-    if (view)
+    if (view) {
+        // If SlimmingPaintCompositorLayerizationEnabled is on, we still need this to set up the root layer(s).
         view->compositor()->updateIfNeededRecursive();
-    scrollContentsIfNeededRecursive();
+
+        if (RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled()) {
+            invalidateTreeIfNeededRecursive();
+            paintAndComposite();
+        }
+        scrollContentsIfNeededRecursive();
+    }
 
     ASSERT(lifecycle().state() >= DocumentLifecycle::CompositingClean);
 }
 
 void FrameView::updateAllLifecyclePhasesInternal()
 {
     // This must be called from the root frame, since it recurses down, not up. Otherwise the lifecycles of the frames might be out of sync.
     ASSERT(frame() == page()->mainFrame() || (!frame().tree().parent()->isLocalFrame()));
 
     // Updating layout can run script, which can tear down the FrameView.
     RefPtrWillBeRawPtr<FrameView> protector(this);
 
     updateStyleAndLayoutIfNeededRecursive();
 
     LayoutView* view = layoutView();
     if (view) {
         TRACE_EVENT1("devtools.timeline", "UpdateLayerTree", "data", InspectorUpdateLayerTreeEvent::data(m_frame.get()));
+        // If SlimmingPaintCompositorLayerizationEnabled is on, we still need this to set up the root layer(s).
+        view->compositor()->updateIfNeededRecursive();
 
-        view->compositor()->updateIfNeededRecursive();
+        if (RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled()) {
+            invalidateTreeIfNeededRecursive();
+            paintAndComposite();
+        }
         scrollContentsIfNeededRecursive();
-        invalidateTreeIfNeededRecursive();
         updatePostLifecycleData();
 
         ASSERT(!view->hasPendingSelection());
     }
 
-    ASSERT(lifecycle().state() == DocumentLifecycle::PaintInvalidationClean);
+    ASSERT(lifecycle().state() == DocumentLifecycle::PaintInvalidationClean
+        || (RuntimeEnabledFeatures::slimmingPaintCompositorLayerizationEnabled() && lifecycle().state() == DocumentLifecycle::CompositingClean));
+}
+
+void FrameView::paintAndComposite()
+{
+    ASSERT(frame() == page()->mainFrame() || (!frame().tree().parent()->isLocalFrame()));
+    LayoutView* view = layoutView();
+    ASSERT(view);
+    GraphicsLayer* rootGraphicsLayer = view->layer()->graphicsLayerBacking();
+    // Detached frames can have no root graphics layer.
+    if (!rootGraphicsLayer)
+        return;
+
+    GraphicsContext context(rootGraphicsLayer->displayItemList());
+    rootGraphicsLayer->paint(context);
+
+    DisplayListDiff displayListDiff;
+    rootGraphicsLayer->displayItemList()->commitNewDisplayItems(&displayListDiff);
+
+    lifecycle().advanceTo(DocumentLifecycle::InCompositingUpdate);
+
+    DisplayListCompositingBuilder compositingBuilder(*rootGraphicsLayer->displayItemList(), displayListDiff, *rootGraphicsLayer);
+    compositingBuilder.build();
+
+    lifecycle().advanceTo(DocumentLifecycle::CompositingClean);
 }
 
 void FrameView::updatePostLifecycleData()
 {
     LayoutView* view = layoutView();
     ASSERT(view);
 
     if (view->compositor()->inCompositingMode() && m_frame->isLocalRoot())
         scrollingCoordinator()->updateAfterCompositingChangeIfNeeded();
 
@@ skipping 1438 matching lines @@
 
     if (!graphicsLayer)
         return;
 
     DeprecatedPaintLayer::mapRectToPaintInvalidationBacking(localFrame->contentLayoutObject(), paintInvalidationContainer, viewRect);
 
     graphicsLayerTimingRequests.add(graphicsLayer, Vector<std::pair<int64_t, WebRect>>()).storedValue->value.append(std::make_pair(m_frame->frameID(), enclosingIntRect(viewRect)));
 }
 
 } // namespace blink