Collect @viewport before constructing RuleSets.

third_party/WebKit/Source/core/dom/StyleEngine.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 19 matching lines @@
 #include "core/dom/StyleEngine.h"
 
 #include "core/HTMLNames.h"
 #include "core/css/CSSDefaultStyleSheets.h"
 #include "core/css/CSSFontSelector.h"
 #include "core/css/CSSStyleSheet.h"
 #include "core/css/FontFaceCache.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/invalidation/InvalidationSet.h"
 #include "core/css/resolver/ScopedStyleResolver.h"
+#include "core/css/resolver/ViewportStyleResolver.h"
 #include "core/dom/DocumentStyleSheetCollector.h"
 #include "core/dom/Element.h"
 #include "core/dom/ElementTraversal.h"
 #include "core/dom/ProcessingInstruction.h"
 #include "core/dom/ShadowTreeStyleSheetCollection.h"
 #include "core/dom/StyleChangeReason.h"
 #include "core/dom/shadow/ShadowRoot.h"
 #include "core/frame/Settings.h"
 #include "core/html/HTMLIFrameElement.h"
 #include "core/html/HTMLLinkElement.h"
 #include "core/html/HTMLSlotElement.h"
 #include "core/html/imports/HTMLImportsController.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/page/Page.h"
 #include "core/svg/SVGStyleElement.h"
 #include "platform/fonts/FontCache.h"
 #include "platform/tracing/TraceEvent.h"
 
 namespace blink {
 
 using namespace HTMLNames;
 
 StyleEngine::StyleEngine(Document& document)
     : m_document(&document),
       m_isMaster(!document.importsController() ||
                  document.importsController()->master() == &document),
       m_documentStyleSheetCollection(
-          DocumentStyleSheetCollection::create(document)),
-      // We don't need to create CSSFontSelector for imported document or
-      // HTMLTemplateElement's document, because those documents have no frame.
-      m_fontSelector(document.frame() ? CSSFontSelector::create(&document)
-                                      : nullptr) {
-  if (m_fontSelector)
+          DocumentStyleSheetCollection::create(document)) {
+  if (document.frame()) {
+    // We don't need to create CSSFontSelector for imported document or
+    // HTMLTemplateElement's document, because those documents have no frame.
+    m_fontSelector = CSSFontSelector::create(&document);
     m_fontSelector->registerForInvalidationCallbacks(this);
+  }
+  if (document.isInMainFrame())
+    m_viewportResolver = ViewportStyleResolver::create(document);
 }
 
 StyleEngine::~StyleEngine() {}
 
 static bool isStyleElement(Node& node) {
   return isHTMLStyleElement(node) || isSVGStyleElement(node);
 }
 
 inline Document* StyleEngine::master() {
   if (isMaster())
@@ skipping 302 matching lines @@
           collection->activeAuthorStyleSheets());
   }
   m_styleSheetCollectionMap.remove(shadowRoot);
   m_activeTreeScopes.remove(shadowRoot);
   m_dirtyTreeScopes.remove(shadowRoot);
 }
 
 void StyleEngine::appendActiveAuthorStyleSheets() {
   DCHECK(isMaster());
 
+  viewportRulesChanged();
+
   m_resolver->appendAuthorStyleSheets(
       documentStyleSheetCollection().activeAuthorStyleSheets());
   for (TreeScope* treeScope : m_activeTreeScopes) {
     if (TreeScopeStyleSheetCollection* collection =
             m_styleSheetCollectionMap.get(treeScope))
       m_resolver->appendAuthorStyleSheets(
           collection->activeAuthorStyleSheets());
   }
   m_resolver->finishAppendAuthorStyleSheets();
 }
@@ skipping 29 matching lines @@
   }
 }
 
 void StyleEngine::clearMasterResolver() {
   if (Document* master = this->master())
     master->styleEngine().clearResolver();
 }
 
 void StyleEngine::didDetach() {
   clearResolver();
+  m_viewportResolver.clear();
 }
 
 bool StyleEngine::shouldClearResolver() const {
   return !m_didCalculateResolver && !haveScriptBlockingStylesheetsLoaded();
 }
 
 void StyleEngine::resolverChanged(StyleResolverUpdateMode mode) {
   if (!isMaster()) {
     if (Document* master = this->master())
       master->styleEngine().resolverChanged(mode);
@@ skipping 485 matching lines @@
 }
 
 void StyleEngine::ensureFullscreenUAStyle() {
   CSSDefaultStyleSheets::instance().ensureDefaultStyleSheetForFullscreen();
   if (!m_resolver)
     return;
   if (!m_resolver->hasFullscreenUAStyle())
     m_resolver->resetRuleFeatures();
 }
 
+void StyleEngine::initialViewportChanged() {
+  if (!m_viewportResolver)
+    return;
+
+  m_viewportResolver->initialViewportChanged();
+
+  // TODO(rune@opera.com): for async stylesheet update, updateViewport() should
+  // be called as part of the lifecycle update for active style. Synchronous for
+  // now.
+  m_viewportResolver->updateViewport(documentStyleSheetCollection());
+}
+
+void StyleEngine::viewportRulesChanged() {
+  if (!m_viewportResolver)
+    return;
+  m_viewportResolver->setNeedsCollectRules();
+
+  // TODO(rune@opera.com): for async stylesheet update, updateViewport() should
+  // be called as part of the lifecycle update for active style. Synchronous for
+  // now.
+  m_viewportResolver->updateViewport(documentStyleSheetCollection());
+}
+
 DEFINE_TRACE(StyleEngine) {
   visitor->trace(m_document);
   visitor->trace(m_injectedAuthorStyleSheets);
   visitor->trace(m_inspectorStyleSheet);
   visitor->trace(m_documentStyleSheetCollection);
   visitor->trace(m_styleSheetCollectionMap);
   visitor->trace(m_resolver);
+  visitor->trace(m_viewportResolver);
   visitor->trace(m_styleInvalidator);
   visitor->trace(m_dirtyTreeScopes);
   visitor->trace(m_activeTreeScopes);
   visitor->trace(m_fontSelector);
   visitor->trace(m_textToSheetCache);
   visitor->trace(m_sheetToTextCache);
   CSSFontSelectorClient::trace(visitor);
 }
 
 DEFINE_TRACE_WRAPPERS(StyleEngine) {
   for (auto sheet : m_injectedAuthorStyleSheets) {
     visitor->traceWrappers(sheet);
   }
   visitor->traceWrappers(m_documentStyleSheetCollection);
 }
 
 }  // namespace blink