/* * 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, 2010, 2012 Apple Inc. All rights reserved. * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/) * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies) * Copyright (C) 2013 Google Inc. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Library General Public License for more details. * * You should have received a copy of the GNU Library General Public License * 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/dom/TreeScopeStyleSheetCollection.h" #include "core/css/CSSStyleSheet.h" #include "core/css/StyleSheetContents.h" #include "core/css/invalidation/StyleSheetInvalidationAnalysis.h" #include "core/css/resolver/StyleResolver.h" #include "core/dom/Element.h" #include "core/dom/StyleEngine.h" #include "core/html/HTMLStyleElement.h" namespace blink { TreeScopeStyleSheetCollection::TreeScopeStyleSheetCollection(TreeScope& treeScope) : m_treeScope(treeScope) , m_usesRemUnits(false) { } void TreeScopeStyleSheetCollection::addStyleSheetCandidateNode(Node* node, bool) { if (!node->inDocument()) return; // Until the exists, we have no choice but to compare document positions, // since styles outside of the body and head continue to be shunted into the head // (and thus can shift to end up before dynamically added DOM content that is also // outside the body). m_styleSheetCandidateNodes.add(node); } void TreeScopeStyleSheetCollection::removeStyleSheetCandidateNode(Node* node, ContainerNode* scopingNode) { m_styleSheetCandidateNodes.remove(node); } TreeScopeStyleSheetCollection::StyleResolverUpdateType TreeScopeStyleSheetCollection::compareStyleSheets(const Vector >& oldStyleSheets, const Vector >& newStylesheets, Vector >& addedSheets) { unsigned newStyleSheetCount = newStylesheets.size(); unsigned oldStyleSheetCount = oldStyleSheets.size(); ASSERT(newStyleSheetCount >= oldStyleSheetCount); if (!newStyleSheetCount) return Reconstruct; unsigned newIndex = 0; for (unsigned oldIndex = 0; oldIndex < oldStyleSheetCount; ++oldIndex) { while (oldStyleSheets[oldIndex] != newStylesheets[newIndex]) { addedSheets.append(newStylesheets[newIndex]->contents()); if (++newIndex == newStyleSheetCount) return Reconstruct; } if (++newIndex == newStyleSheetCount) return Reconstruct; } bool hasInsertions = !addedSheets.isEmpty(); while (newIndex < newStyleSheetCount) { addedSheets.append(newStylesheets[newIndex]->contents()); ++newIndex; } // If all new sheets were added at the end of the list we can just add them to existing StyleResolver. // If there were insertions we need to re-add all the stylesheets so rules are ordered correctly. return hasInsertions ? Reset : Additive; } static bool findFontFaceRulesFromStyleSheetContents(const Vector >& sheets, Vector >& fontFaceRules) { bool hasFontFaceRule = false; for (unsigned i = 0; i < sheets.size(); ++i) { ASSERT(sheets[i]); if (sheets[i]->hasFontFaceRule()) { // FIXME: We don't need this for styles in shadow tree. sheets[i]->findFontFaceRules(fontFaceRules); hasFontFaceRule = true; } } return hasFontFaceRule; } void TreeScopeStyleSheetCollection::analyzeStyleSheetChange(StyleResolverUpdateMode updateMode, const StyleSheetCollection& newCollection, StyleSheetChange& change) { if (updateMode != AnalyzedStyleUpdate) return; // Find out which stylesheets are new. Vector > addedSheets; if (m_activeAuthorStyleSheets.size() <= newCollection.activeAuthorStyleSheets().size()) { change.styleResolverUpdateType = compareStyleSheets(m_activeAuthorStyleSheets, newCollection.activeAuthorStyleSheets(), addedSheets); } else { StyleResolverUpdateType updateType = compareStyleSheets(newCollection.activeAuthorStyleSheets(), m_activeAuthorStyleSheets, addedSheets); if (updateType != Additive) { change.styleResolverUpdateType = updateType; } else { change.styleResolverUpdateType = Reset; // If @font-face is removed, needs full style recalc. if (findFontFaceRulesFromStyleSheetContents(addedSheets, change.fontFaceRulesToRemove)) return; } } // FIXME: If styleResolverUpdateType is Reconstruct, we should return early here since // we need to recalc the whole document. It's wrong to use StyleSheetInvalidationAnalysis since // it only looks at the addedSheets. // No point in doing the analysis work if we're just going to recalc the whole document anyways. // This needs to be done after the compareStyleSheets calls above to ensure we don't throw away // the StyleResolver if we don't need to. if (document().hasPendingForcedStyleRecalc()) return; // If we are already parsing the body and so may have significant amount of elements, put some effort into trying to avoid style recalcs. if (document().hasNodesWithPlaceholderStyle()) return; StyleSheetInvalidationAnalysis invalidationAnalysis(addedSheets); if (invalidationAnalysis.dirtiesAllStyle()) return; invalidationAnalysis.invalidateStyle(document()); change.requiresFullStyleRecalc = false; return; } void TreeScopeStyleSheetCollection::clearMediaQueryRuleSetStyleSheets() { for (size_t i = 0; i < m_activeAuthorStyleSheets.size(); ++i) { StyleSheetContents* contents = m_activeAuthorStyleSheets[i]->contents(); if (contents->hasMediaQueries()) contents->clearRuleSet(); } } static bool styleSheetsUseRemUnits(const Vector >& sheets) { for (unsigned i = 0; i < sheets.size(); ++i) { if (sheets[i]->contents()->usesRemUnits()) return true; } return false; } void TreeScopeStyleSheetCollection::updateUsesRemUnits() { m_usesRemUnits = styleSheetsUseRemUnits(m_activeAuthorStyleSheets); } }