Client side display item cache flag

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 317 matching lines @@
     if (firstPaintInvalidationTrackingEnabled())
         m_debugInfo.clearAnnotatedInvalidateRects();
     incrementPaintCount();
 
     IntRect newInterestRect;
     if (!interestRect) {
         newInterestRect = m_client->computeInterestRect(this, m_previousInterestRect);
         interestRect = &newInterestRect;
     }
 
-    if (!getPaintController().subsequenceCachingIsDisabled()
-        && !m_client->needsRepaint(*this)
+    if (!m_client->needsRepaint(*this)
         && !getPaintController().cacheIsEmpty()
         && m_previousInterestRect == *interestRect) {
         ASSERT(!getPaintController().hasInvalidations());
-        return false;
+        if (!getPaintController().subsequenceCachingIsDisabled())
+            return false;
+        DisplayItemClient::s_cacheStatus = true;
     }
 
     GraphicsContext context(getPaintController(), disabledMode);
 
 #ifndef NDEBUG
     if (contentsOpaque() && s_drawDebugRedFill) {
         FloatRect rect(FloatPoint(), size());
         if (!DrawingRecorder::useCachedDrawingIfPossible(context, *this, DisplayItem::DebugRedFill)) {
             DrawingRecorder recorder(context, *this, DisplayItem::DebugRedFill, rect);
             context.fillRect(rect, SK_ColorRED);
         }
     }
 #endif
 
     m_previousInterestRect = *interestRect;
     m_client->paintContents(this, context, m_paintingPhase, *interestRect);
     notifyFirstPaintToClient();
+    DisplayItemClient::s_cacheStatus = false;
     return true;
 }
 
 void GraphicsLayer::notifyFirstPaintToClient()
 {
     if (!m_painted) {
         DisplayItemList& itemList = m_paintController->newDisplayItemList();
         for (DisplayItem& item : itemList) {
             DisplayItem::Type type = item.getType();
             if (DisplayItem::isDrawingType(type) && type != DisplayItem::DocumentBackground && type != DisplayItem::DebugRedFill && static_cast<const DrawingDisplayItem&>(item).picture()) {
@@ skipping 839 matching lines @@
     if (WebLayer* layer = platformLayer())
         layer->setElementId(id);
 }
 
 void GraphicsLayer::setCompositorMutableProperties(uint32_t properties)
 {
     if (WebLayer* layer = platformLayer())
         layer->setCompositorMutableProperties(properties);
 }
 
+void GraphicsLayer::setCanUseClientCacheStatus(bool b)
+{
+    if (!drawsContent())
+        return;
+    getPaintController().setCanUseClientCacheStatus(b);
+}
+
 } // namespace blink
 
 #ifndef NDEBUG
 void showGraphicsLayerTree(const blink::GraphicsLayer* layer)
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif