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chromium / chromium / src / 0cf5335291d8d064de758455e6aa393097901f21 / . / third_party / blink / renderer / core / css / style_engine.cc
blob: 42c6d158a0447095577d63b5ccebc7ebb1229f8c [file] [log] [blame]
/*
* 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.
* Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) Research In Motion Limited 2010-2011. 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 "third_party/blink/renderer/core/css/style_engine.h"
#include "third_party/blink/renderer/core/css/css_default_style_sheets.h"
#include "third_party/blink/renderer/core/css/css_font_selector.h"
#include "third_party/blink/renderer/core/css/css_style_sheet.h"
#include "third_party/blink/renderer/core/css/document_style_environment_variables.h"
#include "third_party/blink/renderer/core/css/document_style_sheet_collector.h"
#include "third_party/blink/renderer/core/css/font_face_cache.h"
#include "third_party/blink/renderer/core/css/invalidation/invalidation_set.h"
#include "third_party/blink/renderer/core/css/resolver/scoped_style_resolver.h"
#include "third_party/blink/renderer/core/css/resolver/style_rule_usage_tracker.h"
#include "third_party/blink/renderer/core/css/resolver/viewport_style_resolver.h"
#include "third_party/blink/renderer/core/css/shadow_tree_style_sheet_collection.h"
#include "third_party/blink/renderer/core/css/style_change_reason.h"
#include "third_party/blink/renderer/core/css/style_environment_variables.h"
#include "third_party/blink/renderer/core/css/style_sheet_contents.h"
#include "third_party/blink/renderer/core/dom/element.h"
#include "third_party/blink/renderer/core/dom/element_traversal.h"
#include "third_party/blink/renderer/core/dom/processing_instruction.h"
#include "third_party/blink/renderer/core/dom/shadow_root.h"
#include "third_party/blink/renderer/core/frame/settings.h"
#include "third_party/blink/renderer/core/html/html_iframe_element.h"
#include "third_party/blink/renderer/core/html/html_link_element.h"
#include "third_party/blink/renderer/core/html/html_slot_element.h"
#include "third_party/blink/renderer/core/html/imports/html_imports_controller.h"
#include "third_party/blink/renderer/core/html_names.h"
#include "third_party/blink/renderer/core/layout/layout_object.h"
#include "third_party/blink/renderer/core/page/page.h"
#include "third_party/blink/renderer/core/probe/core_probes.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
#include "third_party/blink/renderer/core/svg/svg_style_element.h"
#include "third_party/blink/renderer/platform/fonts/font_cache.h"
#include "third_party/blink/renderer/platform/fonts/font_selector.h"
#include "third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h"
namespace blink {
using namespace HTMLNames;
StyleEngine::StyleEngine(Document& document)
: document_(&document),
is_master_(!document.IsHTMLImport()),
document_style_sheet_collection_(
DocumentStyleSheetCollection::Create(document)) {
if (document.GetFrame()) {
// We don't need to create CSSFontSelector for imported document or
// HTMLTemplateElement's document, because those documents have no frame.
font_selector_ = CSSFontSelector::Create(&document);
font_selector_->RegisterForInvalidationCallbacks(this);
}
if (document.IsInMainFrame())
viewport_resolver_ = ViewportStyleResolver::Create(document);
if (IsMaster())
global_rule_set_ = CSSGlobalRuleSet::Create();
}
StyleEngine::~StyleEngine() = default;
inline Document* StyleEngine::Master() {
if (IsMaster())
return document_;
HTMLImportsController* import = GetDocument().ImportsController();
// Document::ImportsController() can return null while executing its
// destructor.
if (!import)
return nullptr;
return import->Master();
}
TreeScopeStyleSheetCollection& StyleEngine::EnsureStyleSheetCollectionFor(
TreeScope& tree_scope) {
if (tree_scope == document_)
return GetDocumentStyleSheetCollection();
StyleSheetCollectionMap::AddResult result =
style_sheet_collection_map_.insert(&tree_scope, nullptr);
if (result.is_new_entry) {
result.stored_value->value =
new ShadowTreeStyleSheetCollection(ToShadowRoot(tree_scope));
}
return *result.stored_value->value.Get();
}
TreeScopeStyleSheetCollection* StyleEngine::StyleSheetCollectionFor(
TreeScope& tree_scope) {
if (tree_scope == document_)
return &GetDocumentStyleSheetCollection();
StyleSheetCollectionMap::iterator it =
style_sheet_collection_map_.find(&tree_scope);
if (it == style_sheet_collection_map_.end())
return nullptr;
return it->value.Get();
}
const HeapVector<TraceWrapperMember<StyleSheet>>&
StyleEngine::StyleSheetsForStyleSheetList(TreeScope& tree_scope) {
DCHECK(Master());
TreeScopeStyleSheetCollection& collection =
EnsureStyleSheetCollectionFor(tree_scope);
if (Master()->IsActive()) {
if (all_tree_scopes_dirty_) {
// If all tree scopes are dirty, update all of active style. Otherwise, we
// would have to mark all tree scopes explicitly dirty for stylesheet list
// or repeatedly update the stylesheet list on styleSheets access. Note
// that this can only happen once if we kDidLayoutWithPendingSheets in
// Document::UpdateStyleAndLayoutTreeIgnoringPendingStyleSheets.
UpdateActiveStyle();
} else {
collection.UpdateStyleSheetList();
}
}
return collection.StyleSheetsForStyleSheetList();
}
void StyleEngine::InjectSheet(const StyleSheetKey& key,
StyleSheetContents* sheet,
WebDocument::CSSOrigin origin) {
HeapVector<std::pair<StyleSheetKey, TraceWrapperMember<CSSStyleSheet>>>&
injected_style_sheets = origin == WebDocument::kUserOrigin
? injected_user_style_sheets_
: injected_author_style_sheets_;
injected_style_sheets.push_back(
std::make_pair(key, CSSStyleSheet::Create(sheet, *document_)));
if (origin == WebDocument::kUserOrigin)
MarkUserStyleDirty();
else
MarkDocumentDirty();
}
void StyleEngine::RemoveInjectedSheet(const StyleSheetKey& key,
WebDocument::CSSOrigin origin) {
HeapVector<std::pair<StyleSheetKey, TraceWrapperMember<CSSStyleSheet>>>&
injected_style_sheets = origin == WebDocument::kUserOrigin
? injected_user_style_sheets_
: injected_author_style_sheets_;
// Remove the last sheet that matches.
const auto& it = std::find_if(injected_style_sheets.rbegin(),
injected_style_sheets.rend(),
[&key](const auto& item) {
return item.first == key;
});
if (it != injected_style_sheets.rend()) {
injected_style_sheets.erase(std::next(it).base());
if (origin == WebDocument::kUserOrigin)
MarkUserStyleDirty();
else
MarkDocumentDirty();
}
}
CSSStyleSheet& StyleEngine::EnsureInspectorStyleSheet() {
if (inspector_style_sheet_)
return *inspector_style_sheet_;
StyleSheetContents* contents =
StyleSheetContents::Create(CSSParserContext::Create(*document_));
inspector_style_sheet_ = CSSStyleSheet::Create(contents, *document_);
MarkDocumentDirty();
// TODO(futhark@chromium.org): Making the active stylesheets up-to-date here
// is required by some inspector tests, at least. I theory this should not be
// necessary. Need to investigate to figure out if/why.
UpdateActiveStyle();
return *inspector_style_sheet_;
}
void StyleEngine::AddPendingSheet(StyleEngineContext& context) {
pending_script_blocking_stylesheets_++;
context.AddingPendingSheet(GetDocument());
if (context.AddedPendingSheetBeforeBody()) {
pending_render_blocking_stylesheets_++;
} else {
pending_body_stylesheets_++;
GetDocument().DidAddPendingStylesheetInBody();
}
}
// This method is called whenever a top-level stylesheet has finished loading.
void StyleEngine::RemovePendingSheet(Node& style_sheet_candidate_node,
const StyleEngineContext& context) {
if (style_sheet_candidate_node.isConnected())
SetNeedsActiveStyleUpdate(style_sheet_candidate_node.GetTreeScope());
if (context.AddedPendingSheetBeforeBody()) {
DCHECK_GT(pending_render_blocking_stylesheets_, 0);
pending_render_blocking_stylesheets_--;
} else {
DCHECK_GT(pending_body_stylesheets_, 0);
pending_body_stylesheets_--;
if (!pending_body_stylesheets_)
GetDocument().DidRemoveAllPendingBodyStylesheets();
}
// Make sure we knew this sheet was pending, and that our count isn't out of
// sync.
DCHECK_GT(pending_script_blocking_stylesheets_, 0);
pending_script_blocking_stylesheets_--;
if (pending_script_blocking_stylesheets_)
return;
GetDocument().DidRemoveAllPendingStylesheet();
}
void StyleEngine::SetNeedsActiveStyleUpdate(TreeScope& tree_scope) {
if (GetDocument().IsActive() || !IsMaster())
MarkTreeScopeDirty(tree_scope);
}
void StyleEngine::AddStyleSheetCandidateNode(Node& node) {
if (!node.isConnected() || GetDocument().IsDetached())
return;
DCHECK(!IsXSLStyleSheet(node));
TreeScope& tree_scope = node.GetTreeScope();
EnsureStyleSheetCollectionFor(tree_scope).AddStyleSheetCandidateNode(node);
SetNeedsActiveStyleUpdate(tree_scope);
if (tree_scope != document_)
active_tree_scopes_.insert(&tree_scope);
}
void StyleEngine::RemoveStyleSheetCandidateNode(
Node& node,
ContainerNode& insertion_point) {
DCHECK(!IsXSLStyleSheet(node));
DCHECK(insertion_point.isConnected());
ShadowRoot* shadow_root = node.ContainingShadowRoot();
if (!shadow_root)
shadow_root = insertion_point.ContainingShadowRoot();
TreeScope& tree_scope =
shadow_root ? *ToTreeScope(shadow_root) : ToTreeScope(GetDocument());
TreeScopeStyleSheetCollection* collection =
StyleSheetCollectionFor(tree_scope);
// After detaching document, collection could be null. In the case,
// we should not update anything. Instead, just return.
if (!collection)
return;
collection->RemoveStyleSheetCandidateNode(node);
SetNeedsActiveStyleUpdate(tree_scope);
}
void StyleEngine::ModifiedStyleSheetCandidateNode(Node& node) {
if (node.isConnected())
SetNeedsActiveStyleUpdate(node.GetTreeScope());
}
void StyleEngine::MediaQueriesChangedInScope(TreeScope& tree_scope) {
if (ScopedStyleResolver* resolver = tree_scope.GetScopedStyleResolver())
resolver->SetNeedsAppendAllSheets();
SetNeedsActiveStyleUpdate(tree_scope);
}
void StyleEngine::WatchedSelectorsChanged() {
DCHECK(IsMaster());
DCHECK(global_rule_set_);
global_rule_set_->InitWatchedSelectorsRuleSet(GetDocument());
// TODO(futhark@chromium.org): Should be able to use RuleSetInvalidation here.
GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange, StyleChangeReasonForTracing::Create(
StyleChangeReason::kDeclarativeContent));
}
bool StyleEngine::ShouldUpdateDocumentStyleSheetCollection() const {
return all_tree_scopes_dirty_ || document_scope_dirty_ || font_cache_dirty_;
}
bool StyleEngine::ShouldUpdateShadowTreeStyleSheetCollection() const {
return all_tree_scopes_dirty_ || !dirty_tree_scopes_.IsEmpty();
}
void StyleEngine::MediaQueryAffectingValueChanged(
UnorderedTreeScopeSet& tree_scopes) {
for (TreeScope* tree_scope : tree_scopes) {
DCHECK(tree_scope != document_);
ShadowTreeStyleSheetCollection* collection =
ToShadowTreeStyleSheetCollection(StyleSheetCollectionFor(*tree_scope));
DCHECK(collection);
if (collection->MediaQueryAffectingValueChanged())
SetNeedsActiveStyleUpdate(*tree_scope);
}
}
void StyleEngine::MediaQueryAffectingValueChanged() {
if (ClearMediaQueryDependentRuleSets(active_user_style_sheets_))
MarkUserStyleDirty();
if (GetDocumentStyleSheetCollection().MediaQueryAffectingValueChanged())
SetNeedsActiveStyleUpdate(GetDocument());
MediaQueryAffectingValueChanged(active_tree_scopes_);
if (resolver_)
resolver_->UpdateMediaType();
}
void StyleEngine::UpdateActiveStyleSheetsInImport(
StyleEngine& master_engine,
DocumentStyleSheetCollector& parent_collector) {
if (!RuntimeEnabledFeatures::HTMLImportsStyleApplicationEnabled())
return;
DCHECK(!IsMaster());
HeapVector<Member<StyleSheet>> sheets_for_list;
ImportedDocumentStyleSheetCollector subcollector(parent_collector,
sheets_for_list);
GetDocumentStyleSheetCollection().CollectStyleSheets(master_engine,
subcollector);
GetDocumentStyleSheetCollection().SwapSheetsForSheetList(sheets_for_list);
// all_tree_scopes_dirty_ should only be set on main documents, never html
// imports.
DCHECK(!all_tree_scopes_dirty_);
// Mark false for consistency. It is never checked for import documents.
document_scope_dirty_ = false;
}
void StyleEngine::UpdateActiveStyleSheetsInShadow(
TreeScope* tree_scope,
UnorderedTreeScopeSet& tree_scopes_removed) {
DCHECK_NE(tree_scope, document_);
ShadowTreeStyleSheetCollection* collection =
ToShadowTreeStyleSheetCollection(StyleSheetCollectionFor(*tree_scope));
DCHECK(collection);
collection->UpdateActiveStyleSheets(*this);
if (!collection->HasStyleSheetCandidateNodes()) {
tree_scopes_removed.insert(tree_scope);
// When removing TreeScope from ActiveTreeScopes,
// its resolver should be destroyed by invoking resetAuthorStyle.
DCHECK(!tree_scope->GetScopedStyleResolver());
}
}
void StyleEngine::UpdateActiveUserStyleSheets() {
DCHECK(user_style_dirty_);
ActiveStyleSheetVector new_active_sheets;
for (auto& sheet : injected_user_style_sheets_) {
if (RuleSet* rule_set = RuleSetForSheet(*sheet.second))
new_active_sheets.push_back(std::make_pair(sheet.second, rule_set));
}
ApplyRuleSetChanges(*document_, active_user_style_sheets_, new_active_sheets,
kInvalidateAllScopes);
new_active_sheets.swap(active_user_style_sheets_);
}
void StyleEngine::UpdateActiveStyleSheets() {
if (!NeedsActiveStyleSheetUpdate())
return;
DCHECK(IsMaster());
DCHECK(!GetDocument().InStyleRecalc());
DCHECK(GetDocument().IsActive());
TRACE_EVENT0("blink,blink_style", "StyleEngine::updateActiveStyleSheets");
if (user_style_dirty_)
UpdateActiveUserStyleSheets();
if (ShouldUpdateDocumentStyleSheetCollection())
GetDocumentStyleSheetCollection().UpdateActiveStyleSheets(*this);
if (ShouldUpdateShadowTreeStyleSheetCollection()) {
UnorderedTreeScopeSet tree_scopes_removed;
if (all_tree_scopes_dirty_) {
for (TreeScope* tree_scope : active_tree_scopes_)
UpdateActiveStyleSheetsInShadow(tree_scope, tree_scopes_removed);
} else {
for (TreeScope* tree_scope : dirty_tree_scopes_)
UpdateActiveStyleSheetsInShadow(tree_scope, tree_scopes_removed);
}
for (TreeScope* tree_scope : tree_scopes_removed)
active_tree_scopes_.erase(tree_scope);
}
probe::activeStyleSheetsUpdated(document_);
dirty_tree_scopes_.clear();
document_scope_dirty_ = false;
all_tree_scopes_dirty_ = false;
tree_scopes_removed_ = false;
user_style_dirty_ = false;
}
void StyleEngine::UpdateViewport() {
if (viewport_resolver_)
viewport_resolver_->UpdateViewport(GetDocumentStyleSheetCollection());
}
bool StyleEngine::NeedsActiveStyleUpdate() const {
return (viewport_resolver_ && viewport_resolver_->NeedsUpdate()) ||
NeedsActiveStyleSheetUpdate() ||
(global_rule_set_ && global_rule_set_->IsDirty());
}
void StyleEngine::UpdateActiveStyle() {
DCHECK(GetDocument().IsActive());
UpdateViewport();
UpdateActiveStyleSheets();
UpdateGlobalRuleSet();
}
const ActiveStyleSheetVector StyleEngine::ActiveStyleSheetsForInspector() {
if (GetDocument().IsActive())
UpdateActiveStyle();
if (active_tree_scopes_.IsEmpty())
return GetDocumentStyleSheetCollection().ActiveAuthorStyleSheets();
ActiveStyleSheetVector active_style_sheets;
active_style_sheets.AppendVector(
GetDocumentStyleSheetCollection().ActiveAuthorStyleSheets());
for (TreeScope* tree_scope : active_tree_scopes_) {
if (TreeScopeStyleSheetCollection* collection =
style_sheet_collection_map_.at(tree_scope))
active_style_sheets.AppendVector(collection->ActiveAuthorStyleSheets());
}
// FIXME: Inspector needs a vector which has all active stylesheets.
// However, creating such a large vector might cause performance regression.
// Need to implement some smarter solution.
return active_style_sheets;
}
void StyleEngine::ShadowRootRemovedFromDocument(ShadowRoot* shadow_root) {
style_sheet_collection_map_.erase(shadow_root);
active_tree_scopes_.erase(shadow_root);
dirty_tree_scopes_.erase(shadow_root);
tree_scopes_removed_ = true;
ResetAuthorStyle(*shadow_root);
}
void StyleEngine::AddTreeBoundaryCrossingScope(const TreeScope& tree_scope) {
tree_boundary_crossing_scopes_.Add(&tree_scope.RootNode());
}
void StyleEngine::ResetAuthorStyle(TreeScope& tree_scope) {
tree_boundary_crossing_scopes_.Remove(&tree_scope.RootNode());
ScopedStyleResolver* scoped_resolver = tree_scope.GetScopedStyleResolver();
if (!scoped_resolver)
return;
global_rule_set_->MarkDirty();
if (tree_scope.RootNode().IsDocumentNode()) {
scoped_resolver->ResetAuthorStyle();
return;
}
tree_scope.ClearScopedStyleResolver();
}
void StyleEngine::SetRuleUsageTracker(StyleRuleUsageTracker* tracker) {
tracker_ = tracker;
if (resolver_)
resolver_->SetRuleUsageTracker(tracker_);
}
RuleSet* StyleEngine::RuleSetForSheet(CSSStyleSheet& sheet) {
if (!sheet.MatchesMediaQueries(EnsureMediaQueryEvaluator()))
return nullptr;
AddRuleFlags add_rule_flags = kRuleHasNoSpecialState;
if (document_->GetSecurityOrigin()->CanRequest(sheet.BaseURL()))
add_rule_flags = kRuleHasDocumentSecurityOrigin;
return &sheet.Contents()->EnsureRuleSet(*media_query_evaluator_,
add_rule_flags);
}
void StyleEngine::CreateResolver() {
resolver_ = StyleResolver::Create(*document_);
resolver_->SetRuleUsageTracker(tracker_);
}
void StyleEngine::ClearResolvers() {
DCHECK(!GetDocument().InStyleRecalc());
DCHECK(IsMaster() || !resolver_);
GetDocument().ClearScopedStyleResolver();
for (TreeScope* tree_scope : active_tree_scopes_)
tree_scope->ClearScopedStyleResolver();
if (resolver_) {
TRACE_EVENT1("blink", "StyleEngine::clearResolver", "frame",
ToTraceValue(GetDocument().GetFrame()));
resolver_->Dispose();
resolver_.Clear();
}
}
void StyleEngine::DidDetach() {
ClearResolvers();
if (global_rule_set_)
global_rule_set_->Dispose();
global_rule_set_ = nullptr;
tree_boundary_crossing_scopes_.Clear();
dirty_tree_scopes_.clear();
active_tree_scopes_.clear();
viewport_resolver_ = nullptr;
media_query_evaluator_ = nullptr;
if (font_selector_)
font_selector_->GetFontFaceCache()->ClearAll();
font_selector_ = nullptr;
if (environment_variables_)
environment_variables_->DetachFromParent();
environment_variables_ = nullptr;
}
void StyleEngine::ClearFontCache() {
if (font_selector_)
font_selector_->GetFontFaceCache()->ClearCSSConnected();
if (resolver_)
resolver_->InvalidateMatchedPropertiesCache();
}
void StyleEngine::RefreshFontCache() {
DCHECK(IsFontCacheDirty());
ClearFontCache();
// Rebuild the font cache with @font-face rules from user style sheets.
for (unsigned i = 0; i < active_user_style_sheets_.size(); ++i) {
DCHECK(active_user_style_sheets_[i].second);
AddFontFaceRules(*active_user_style_sheets_[i].second);
}
font_cache_dirty_ = false;
}
void StyleEngine::UpdateGenericFontFamilySettings() {
// FIXME: we should not update generic font family settings when
// document is inactive.
DCHECK(GetDocument().IsActive());
if (!font_selector_)
return;
font_selector_->UpdateGenericFontFamilySettings(*document_);
if (resolver_)
resolver_->InvalidateMatchedPropertiesCache();
FontCache::GetFontCache()->InvalidateShapeCache();
}
void StyleEngine::RemoveFontFaceRules(
const HeapVector<Member<const StyleRuleFontFace>>& font_face_rules) {
if (!font_selector_)
return;
FontFaceCache* cache = font_selector_->GetFontFaceCache();
for (const auto& rule : font_face_rules)
cache->Remove(rule);
if (resolver_)
resolver_->InvalidateMatchedPropertiesCache();
}
void StyleEngine::MarkTreeScopeDirty(TreeScope& scope) {
if (scope == document_) {
MarkDocumentDirty();
return;
}
TreeScopeStyleSheetCollection* collection = StyleSheetCollectionFor(scope);
DCHECK(collection);
collection->MarkSheetListDirty();
dirty_tree_scopes_.insert(&scope);
GetDocument().ScheduleLayoutTreeUpdateIfNeeded();
}
void StyleEngine::MarkDocumentDirty() {
document_scope_dirty_ = true;
document_style_sheet_collection_->MarkSheetListDirty();
if (RuntimeEnabledFeatures::CSSViewportEnabled())
ViewportRulesChanged();
if (GetDocument().ImportLoader())
GetDocument().MasterDocument().GetStyleEngine().MarkDocumentDirty();
else
GetDocument().ScheduleLayoutTreeUpdateIfNeeded();
}
void StyleEngine::MarkUserStyleDirty() {
user_style_dirty_ = true;
GetDocument().ScheduleLayoutTreeUpdateIfNeeded();
}
CSSStyleSheet* StyleEngine::CreateSheet(Element& element,
const String& text,
TextPosition start_position,
StyleEngineContext& context) {
DCHECK(element.GetDocument() == GetDocument());
CSSStyleSheet* style_sheet = nullptr;
AddPendingSheet(context);
AtomicString text_content(text);
auto result = text_to_sheet_cache_.insert(text_content, nullptr);
StyleSheetContents* contents = result.stored_value->value;
if (result.is_new_entry || !contents ||
!contents->IsCacheableForStyleElement()) {
result.stored_value->value = nullptr;
style_sheet = ParseSheet(element, text, start_position);
if (style_sheet->Contents()->IsCacheableForStyleElement()) {
result.stored_value->value = style_sheet->Contents();
sheet_to_text_cache_.insert(style_sheet->Contents(), text_content);
}
} else {
DCHECK(contents);
DCHECK(contents->IsCacheableForStyleElement());
DCHECK(contents->HasSingleOwnerDocument());
contents->SetIsUsedFromTextCache();
style_sheet =
CSSStyleSheet::CreateInline(contents, element, start_position);
}
DCHECK(style_sheet);
if (!element.IsInShadowTree()) {
String title = element.title();
if (!title.IsEmpty()) {
style_sheet->SetTitle(title);
SetPreferredStylesheetSetNameIfNotSet(title);
}
}
return style_sheet;
}
CSSStyleSheet* StyleEngine::ParseSheet(Element& element,
const String& text,
TextPosition start_position) {
CSSStyleSheet* style_sheet = nullptr;
style_sheet = CSSStyleSheet::CreateInline(element, NullURL(), start_position,
GetDocument().Encoding());
style_sheet->Contents()->ParseStringAtPosition(text, start_position);
return style_sheet;
}
void StyleEngine::CollectUserStyleFeaturesTo(RuleFeatureSet& features) const {
for (unsigned i = 0; i < active_user_style_sheets_.size(); ++i) {
CSSStyleSheet* sheet = active_user_style_sheets_[i].first;
features.ViewportDependentMediaQueryResults().AppendVector(
sheet->ViewportDependentMediaQueryResults());
features.DeviceDependentMediaQueryResults().AppendVector(
sheet->DeviceDependentMediaQueryResults());
DCHECK(sheet->Contents()->HasRuleSet());
features.Add(sheet->Contents()->GetRuleSet().Features());
}
}
void StyleEngine::CollectScopedStyleFeaturesTo(RuleFeatureSet& features) const {
HeapHashSet<Member<const StyleSheetContents>>
visited_shared_style_sheet_contents;
if (GetDocument().GetScopedStyleResolver()) {
GetDocument().GetScopedStyleResolver()->CollectFeaturesTo(
features, visited_shared_style_sheet_contents);
}
for (TreeScope* tree_scope : active_tree_scopes_) {
if (ScopedStyleResolver* resolver = tree_scope->GetScopedStyleResolver()) {
resolver->CollectFeaturesTo(features,
visited_shared_style_sheet_contents);
}
}
}
void StyleEngine::FontsNeedUpdate(FontSelector*) {
if (!GetDocument().IsActive())
return;
if (resolver_)
resolver_->InvalidateMatchedPropertiesCache();
GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange,
StyleChangeReasonForTracing::Create(StyleChangeReason::kFonts));
probe::fontsUpdated(document_, nullptr, String(), nullptr);
}
void StyleEngine::SetFontSelector(CSSFontSelector* font_selector) {
if (font_selector_)
font_selector_->UnregisterForInvalidationCallbacks(this);
font_selector_ = font_selector;
if (font_selector_)
font_selector_->RegisterForInvalidationCallbacks(this);
}
void StyleEngine::PlatformColorsChanged() {
if (resolver_)
resolver_->InvalidateMatchedPropertiesCache();
GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange, StyleChangeReasonForTracing::Create(
StyleChangeReason::kPlatformColorChange));
}
bool StyleEngine::ShouldSkipInvalidationFor(const Element& element) const {
if (GetDocument().GetStyleChangeType() >= kSubtreeStyleChange)
return true;
if (!element.InActiveDocument())
return true;
if (!element.parentNode())
return true;
return element.parentNode()->GetStyleChangeType() >= kSubtreeStyleChange;
}
void StyleEngine::ClassChangedForElement(
const SpaceSplitString& changed_classes,
Element& element) {
if (ShouldSkipInvalidationFor(element))
return;
InvalidationLists invalidation_lists;
unsigned changed_size = changed_classes.size();
const RuleFeatureSet& features = GetRuleFeatureSet();
for (unsigned i = 0; i < changed_size; ++i) {
features.CollectInvalidationSetsForClass(invalidation_lists, element,
changed_classes[i]);
}
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
element);
}
void StyleEngine::ClassChangedForElement(const SpaceSplitString& old_classes,
const SpaceSplitString& new_classes,
Element& element) {
if (ShouldSkipInvalidationFor(element))
return;
if (!old_classes.size()) {
ClassChangedForElement(new_classes, element);
return;
}
// Class vectors tend to be very short. This is faster than using a hash
// table.
BitVector remaining_class_bits;
remaining_class_bits.EnsureSize(old_classes.size());
InvalidationLists invalidation_lists;
const RuleFeatureSet& features = GetRuleFeatureSet();
for (unsigned i = 0; i < new_classes.size(); ++i) {
bool found = false;
for (unsigned j = 0; j < old_classes.size(); ++j) {
if (new_classes[i] == old_classes[j]) {
// Mark each class that is still in the newClasses so we can skip doing
// an n^2 search below when looking for removals. We can't break from
// this loop early since a class can appear more than once.
remaining_class_bits.QuickSet(j);
found = true;
}
}
// Class was added.
if (!found) {
features.CollectInvalidationSetsForClass(invalidation_lists, element,
new_classes[i]);
}
}
for (unsigned i = 0; i < old_classes.size(); ++i) {
if (remaining_class_bits.QuickGet(i))
continue;
// Class was removed.
features.CollectInvalidationSetsForClass(invalidation_lists, element,
old_classes[i]);
}
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
element);
}
void StyleEngine::AttributeChangedForElement(
const QualifiedName& attribute_name,
Element& element) {
if (ShouldSkipInvalidationFor(element))
return;
InvalidationLists invalidation_lists;
GetRuleFeatureSet().CollectInvalidationSetsForAttribute(
invalidation_lists, element, attribute_name);
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
element);
}
void StyleEngine::IdChangedForElement(const AtomicString& old_id,
const AtomicString& new_id,
Element& element) {
if (ShouldSkipInvalidationFor(element))
return;
InvalidationLists invalidation_lists;
const RuleFeatureSet& features = GetRuleFeatureSet();
if (!old_id.IsEmpty())
features.CollectInvalidationSetsForId(invalidation_lists, element, old_id);
if (!new_id.IsEmpty())
features.CollectInvalidationSetsForId(invalidation_lists, element, new_id);
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
element);
}
void StyleEngine::PseudoStateChangedForElement(
CSSSelector::PseudoType pseudo_type,
Element& element) {
if (ShouldSkipInvalidationFor(element))
return;
InvalidationLists invalidation_lists;
GetRuleFeatureSet().CollectInvalidationSetsForPseudoClass(
invalidation_lists, element, pseudo_type);
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
element);
}
void StyleEngine::PartChangedForElement(Element& element) {
if (ShouldSkipInvalidationFor(element))
return;
if (element.GetTreeScope() == document_)
return;
if (!GetRuleFeatureSet().InvalidatesParts())
return;
element.SetNeedsStyleRecalc(
kLocalStyleChange,
StyleChangeReasonForTracing::FromAttribute(HTMLNames::partAttr));
}
void StyleEngine::PartmapChangedForElement(Element& element) {
if (ShouldSkipInvalidationFor(element))
return;
if (!element.GetShadowRoot())
return;
InvalidationLists invalidation_lists;
GetRuleFeatureSet().CollectPartInvalidationSet(invalidation_lists);
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
element);
}
void StyleEngine::ScheduleSiblingInvalidationsForElement(
Element& element,
ContainerNode& scheduling_parent,
unsigned min_direct_adjacent) {
DCHECK(min_direct_adjacent);
InvalidationLists invalidation_lists;
const RuleFeatureSet& features = GetRuleFeatureSet();
if (element.HasID()) {
features.CollectSiblingInvalidationSetForId(invalidation_lists, element,
element.IdForStyleResolution(),
min_direct_adjacent);
}
if (element.HasClass()) {
const SpaceSplitString& class_names = element.ClassNames();
for (size_t i = 0; i < class_names.size(); i++) {
features.CollectSiblingInvalidationSetForClass(
invalidation_lists, element, class_names[i], min_direct_adjacent);
}
}
for (const Attribute& attribute : element.Attributes()) {
features.CollectSiblingInvalidationSetForAttribute(
invalidation_lists, element, attribute.GetName(), min_direct_adjacent);
}
features.CollectUniversalSiblingInvalidationSet(invalidation_lists,
min_direct_adjacent);
pending_invalidations_.ScheduleSiblingInvalidationsAsDescendants(
invalidation_lists, scheduling_parent);
}
void StyleEngine::ScheduleInvalidationsForInsertedSibling(
Element* before_element,
Element& inserted_element) {
unsigned affected_siblings =
inserted_element.parentNode()->ChildrenAffectedByIndirectAdjacentRules()
? UINT_MAX
: MaxDirectAdjacentSelectors();
ContainerNode* scheduling_parent =
inserted_element.ParentElementOrShadowRoot();
if (!scheduling_parent)
return;
ScheduleSiblingInvalidationsForElement(inserted_element, *scheduling_parent,
1);
for (unsigned i = 1; before_element && i <= affected_siblings;
i++, before_element =
ElementTraversal::PreviousSibling(*before_element)) {
ScheduleSiblingInvalidationsForElement(*before_element, *scheduling_parent,
i);
}
}
void StyleEngine::ScheduleInvalidationsForRemovedSibling(
Element* before_element,
Element& removed_element,
Element& after_element) {
unsigned affected_siblings =
after_element.parentNode()->ChildrenAffectedByIndirectAdjacentRules()
? UINT_MAX
: MaxDirectAdjacentSelectors();
ContainerNode* scheduling_parent = after_element.ParentElementOrShadowRoot();
if (!scheduling_parent)
return;
ScheduleSiblingInvalidationsForElement(removed_element, *scheduling_parent,
1);
for (unsigned i = 1; before_element && i <= affected_siblings;
i++, before_element =
ElementTraversal::PreviousSibling(*before_element)) {
ScheduleSiblingInvalidationsForElement(*before_element, *scheduling_parent,
i);
}
}
void StyleEngine::ScheduleNthPseudoInvalidations(ContainerNode& nth_parent) {
InvalidationLists invalidation_lists;
GetRuleFeatureSet().CollectNthInvalidationSet(invalidation_lists);
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
nth_parent);
}
void StyleEngine::ScheduleRuleSetInvalidationsForElement(
Element& element,
const HeapHashSet<Member<RuleSet>>& rule_sets) {
AtomicString id;
const SpaceSplitString* class_names = nullptr;
if (element.HasID())
id = element.IdForStyleResolution();
if (element.HasClass())
class_names = &element.ClassNames();
InvalidationLists invalidation_lists;
for (const auto& rule_set : rule_sets) {
if (!id.IsNull()) {
rule_set->Features().CollectInvalidationSetsForId(invalidation_lists,
element, id);
}
if (class_names) {
unsigned class_name_count = class_names->size();
for (size_t i = 0; i < class_name_count; i++) {
rule_set->Features().CollectInvalidationSetsForClass(
invalidation_lists, element, (*class_names)[i]);
}
}
for (const Attribute& attribute : element.Attributes()) {
rule_set->Features().CollectInvalidationSetsForAttribute(
invalidation_lists, element, attribute.GetName());
}
}
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
element);
}
void StyleEngine::ScheduleTypeRuleSetInvalidations(
ContainerNode& node,
const HeapHashSet<Member<RuleSet>>& rule_sets) {
InvalidationLists invalidation_lists;
for (const auto& rule_set : rule_sets) {
rule_set->Features().CollectTypeRuleInvalidationSet(invalidation_lists,
node);
}
DCHECK(invalidation_lists.siblings.IsEmpty());
pending_invalidations_.ScheduleInvalidationSetsForNode(invalidation_lists,
node);
if (!node.IsShadowRoot())
return;
Element& host = ToShadowRoot(node).host();
if (host.NeedsStyleRecalc())
return;
for (auto& invalidation_set : invalidation_lists.descendants) {
if (invalidation_set->InvalidatesTagName(host)) {
host.SetNeedsStyleRecalc(kLocalStyleChange,
StyleChangeReasonForTracing::Create(
StyleChangeReason::kStyleSheetChange));
return;
}
}
}
void StyleEngine::InvalidateStyle() {
StyleInvalidator style_invalidator(
pending_invalidations_.GetPendingInvalidationMap());
style_invalidator.Invalidate(*document_);
}
void StyleEngine::InvalidateSlottedElements(HTMLSlotElement& slot) {
for (auto& node : slot.FlattenedAssignedNodes()) {
if (node->IsElementNode()) {
node->SetNeedsStyleRecalc(kLocalStyleChange,
StyleChangeReasonForTracing::Create(
StyleChangeReason::kStyleSheetChange));
}
}
}
void StyleEngine::ScheduleInvalidationsForRuleSets(
TreeScope& tree_scope,
const HeapHashSet<Member<RuleSet>>& rule_sets,
InvalidationScope invalidation_scope) {
#if DCHECK_IS_ON()
// Full scope recalcs should be handled while collecting the ruleSets before
// calling this method.
for (auto rule_set : rule_sets)
DCHECK(!rule_set->Features().NeedsFullRecalcForRuleSetInvalidation());
#endif // DCHECK_IS_ON()
TRACE_EVENT0("blink,blink_style",
"StyleEngine::scheduleInvalidationsForRuleSets");
ScheduleTypeRuleSetInvalidations(tree_scope.RootNode(), rule_sets);
bool invalidate_slotted = false;
if (tree_scope.RootNode().IsShadowRoot()) {
Element& host = ToShadowRoot(tree_scope.RootNode()).host();
ScheduleRuleSetInvalidationsForElement(host, rule_sets);
if (host.GetStyleChangeType() >= kSubtreeStyleChange)
return;
for (auto rule_set : rule_sets) {
if (rule_set->HasSlottedRules()) {
invalidate_slotted = true;
break;
}
}
}
Node* stay_within = &tree_scope.RootNode();
Element* element = ElementTraversal::FirstChild(*stay_within);
while (element) {
ScheduleRuleSetInvalidationsForElement(*element, rule_sets);
if (invalidate_slotted && IsHTMLSlotElement(element))
InvalidateSlottedElements(ToHTMLSlotElement(*element));
if (invalidation_scope == kInvalidateAllScopes) {
if (ShadowRoot* shadow_root = element->GetShadowRoot()) {
ScheduleInvalidationsForRuleSets(*shadow_root, rule_sets,
kInvalidateAllScopes);
}
}
if (element->GetStyleChangeType() < kSubtreeStyleChange)
element = ElementTraversal::Next(*element, stay_within);
else
element = ElementTraversal::NextSkippingChildren(*element, stay_within);
}
}
void StyleEngine::SetStatsEnabled(bool enabled) {
if (!enabled) {
style_resolver_stats_ = nullptr;
return;
}
if (!style_resolver_stats_)
style_resolver_stats_ = StyleResolverStats::Create();
else
style_resolver_stats_->Reset();
}
void StyleEngine::SetPreferredStylesheetSetNameIfNotSet(const String& name) {
DCHECK(!name.IsEmpty());
if (!preferred_stylesheet_set_name_.IsEmpty())
return;
preferred_stylesheet_set_name_ = name;
MarkDocumentDirty();
}
void StyleEngine::SetHttpDefaultStyle(const String& content) {
if (!content.IsEmpty())
SetPreferredStylesheetSetNameIfNotSet(content);
}
void StyleEngine::EnsureUAStyleForFullscreen() {
DCHECK(IsMaster());
DCHECK(global_rule_set_);
if (global_rule_set_->HasFullscreenUAStyle())
return;
CSSDefaultStyleSheets::Instance().EnsureDefaultStyleSheetForFullscreen();
global_rule_set_->MarkDirty();
UpdateActiveStyle();
}
void StyleEngine::EnsureUAStyleForElement(const Element& element) {
DCHECK(IsMaster());
DCHECK(global_rule_set_);
if (CSSDefaultStyleSheets::Instance().EnsureDefaultStyleSheetsForElement(
element)) {
global_rule_set_->MarkDirty();
UpdateActiveStyle();
}
}
bool StyleEngine::HasRulesForId(const AtomicString& id) const {
DCHECK(IsMaster());
DCHECK(global_rule_set_);
return global_rule_set_->GetRuleFeatureSet().HasSelectorForId(id);
}
void StyleEngine::InitialStyleChanged() {
if (viewport_resolver_)
viewport_resolver_->InitialStyleChanged();
// Media queries may rely on the initial font size relative lengths which may
// have changed.
MediaQueryAffectingValueChanged();
GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange,
StyleChangeReasonForTracing::Create(StyleChangeReason::kSettings));
}
void StyleEngine::InitialViewportChanged() {
if (viewport_resolver_)
viewport_resolver_->InitialViewportChanged();
}
void StyleEngine::ViewportRulesChanged() {
if (viewport_resolver_)
viewport_resolver_->SetNeedsCollectRules();
}
void StyleEngine::HtmlImportAddedOrRemoved() {
if (GetDocument().ImportLoader()) {
GetDocument().MasterDocument().GetStyleEngine().HtmlImportAddedOrRemoved();
return;
}
// When we remove an import link and re-insert it into the document, the
// import Document and CSSStyleSheet pointers are persisted. That means the
// comparison of active stylesheets is not able to figure out that the order
// of the stylesheets have changed after insertion.
//
// This is also the case when we import the same document twice where the
// last inserted document is inserted before the first one in dom order where
// the last would take precedence.
//
// Fall back to re-add all sheets to the scoped resolver and recalculate style
// for the whole document when we remove or insert an import document.
if (ScopedStyleResolver* resolver = GetDocument().GetScopedStyleResolver()) {
MarkDocumentDirty();
resolver->SetNeedsAppendAllSheets();
GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange, StyleChangeReasonForTracing::Create(
StyleChangeReason::kActiveStylesheetsUpdate));
}
}
void StyleEngine::V0ShadowAddedOnV1Document() {
// No need to look into the ScopedStyleResolver for document, as ::slotted
// never matches anything in a document tree.
for (TreeScope* tree_scope : active_tree_scopes_) {
if (ScopedStyleResolver* resolver = tree_scope->GetScopedStyleResolver())
resolver->V0ShadowAddedOnV1Document();
}
}
namespace {
enum RuleSetFlags {
kFontFaceRules = 1 << 0,
kKeyframesRules = 1 << 1,
kFullRecalcRules = 1 << 2
};
unsigned GetRuleSetFlags(const HeapHashSet<Member<RuleSet>> rule_sets) {
unsigned flags = 0;
for (auto& rule_set : rule_sets) {
rule_set->CompactRulesIfNeeded();
if (!rule_set->KeyframesRules().IsEmpty())
flags |= kKeyframesRules;
if (!rule_set->FontFaceRules().IsEmpty())
flags |= kFontFaceRules;
if (rule_set->NeedsFullRecalcForRuleSetInvalidation())
flags |= kFullRecalcRules;
}
return flags;
}
} // namespace
void StyleEngine::ApplyRuleSetChanges(
TreeScope& tree_scope,
const ActiveStyleSheetVector& old_style_sheets,
const ActiveStyleSheetVector& new_style_sheets,
InvalidationScope invalidation_scope) {
DCHECK(IsMaster());
DCHECK(global_rule_set_);
HeapHashSet<Member<RuleSet>> changed_rule_sets;
ActiveSheetsChange change = CompareActiveStyleSheets(
old_style_sheets, new_style_sheets, changed_rule_sets);
bool append_all_sheets = false;
if (invalidation_scope == kInvalidateCurrentScope) {
if (ScopedStyleResolver* scoped_resolver =
tree_scope.GetScopedStyleResolver())
append_all_sheets = scoped_resolver->NeedsAppendAllSheets();
// When the font cache is dirty we have to rebuild it and then add all the
// @font-face rules in the document scope.
if (IsFontCacheDirty()) {
DCHECK(tree_scope.RootNode().IsDocumentNode());
append_all_sheets = true;
}
if (change == kNoActiveSheetsChanged && !append_all_sheets)
return;
}
// With rules added or removed, we need to re-aggregate rule meta data.
global_rule_set_->MarkDirty();
unsigned changed_rule_flags = GetRuleSetFlags(changed_rule_sets);
bool fonts_changed = tree_scope.RootNode().IsDocumentNode() &&
(changed_rule_flags & kFontFaceRules);
bool keyframes_changed = changed_rule_flags & kKeyframesRules;
unsigned append_start_index = 0;
// We don't need to mark the font cache dirty if new sheets are appended.
if (fonts_changed && (invalidation_scope == kInvalidateAllScopes ||
change == kActiveSheetsChanged)) {
MarkFontCacheDirty();
}
if (invalidation_scope == kInvalidateAllScopes) {
if (keyframes_changed) {
if (change == kActiveSheetsChanged)
ClearKeyframeRules();
for (auto* it = new_style_sheets.begin(); it != new_style_sheets.end();
it++) {
DCHECK(it->second);
AddKeyframeRules(*it->second);
}
}
}
if (invalidation_scope == kInvalidateCurrentScope) {
if (IsFontCacheDirty()) {
DCHECK(tree_scope.RootNode().IsDocumentNode());
DCHECK(change != kActiveSheetsAppended || append_all_sheets);
RefreshFontCache();
}
// - If all sheets were removed, we remove the ScopedStyleResolver.
// - If new sheets were appended to existing ones, start appending after the
// common prefix.
// - For other diffs, reset author style and re-add all sheets for the
// TreeScope.
if (tree_scope.GetScopedStyleResolver()) {
if (new_style_sheets.IsEmpty())
ResetAuthorStyle(tree_scope);
else if (change == kActiveSheetsAppended && !append_all_sheets)
append_start_index = old_style_sheets.size();
else
tree_scope.GetScopedStyleResolver()->ResetAuthorStyle();
}
if (!new_style_sheets.IsEmpty()) {
tree_scope.EnsureScopedStyleResolver().AppendActiveStyleSheets(
append_start_index, new_style_sheets);
}
}
if (tree_scope.GetDocument().HasPendingForcedStyleRecalc())
return;
if (!tree_scope.GetDocument().body() ||
tree_scope.GetDocument().HasNodesWithPlaceholderStyle()) {
tree_scope.GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange, StyleChangeReasonForTracing::Create(
StyleChangeReason::kCleanupPlaceholderStyles));
return;
}
if (changed_rule_sets.IsEmpty())
return;
if (keyframes_changed)
ScopedStyleResolver::KeyframesRulesAdded(tree_scope);
Node& invalidation_root =
ScopedStyleResolver::InvalidationRootForTreeScope(tree_scope);
if (invalidation_root.GetStyleChangeType() >= kSubtreeStyleChange)
return;
if (fonts_changed || (changed_rule_flags & kFullRecalcRules)) {
invalidation_root.SetNeedsStyleRecalc(
kSubtreeStyleChange, StyleChangeReasonForTracing::Create(
StyleChangeReason::kActiveStylesheetsUpdate));
return;
}
ScheduleInvalidationsForRuleSets(tree_scope, changed_rule_sets,
invalidation_scope);
}
const MediaQueryEvaluator& StyleEngine::EnsureMediaQueryEvaluator() {
if (!media_query_evaluator_) {
if (GetDocument().GetFrame()) {
media_query_evaluator_ =
new MediaQueryEvaluator(GetDocument().GetFrame());
} else {
media_query_evaluator_ = new MediaQueryEvaluator("all");
}
}
return *media_query_evaluator_;
}
bool StyleEngine::MediaQueryAffectedByViewportChange() {
DCHECK(IsMaster());
DCHECK(global_rule_set_);
const MediaQueryEvaluator& evaluator = EnsureMediaQueryEvaluator();
const auto& results = global_rule_set_->GetRuleFeatureSet()
.ViewportDependentMediaQueryResults();
for (unsigned i = 0; i < results.size(); ++i) {
if (evaluator.Eval(results[i].Expression()) != results[i].Result())
return true;
}
return false;
}
bool StyleEngine::MediaQueryAffectedByDeviceChange() {
DCHECK(IsMaster());
DCHECK(global_rule_set_);
const MediaQueryEvaluator& evaluator = EnsureMediaQueryEvaluator();
const auto& results =
global_rule_set_->GetRuleFeatureSet().DeviceDependentMediaQueryResults();
for (unsigned i = 0; i < results.size(); ++i) {
if (evaluator.Eval(results[i].Expression()) != results[i].Result())
return true;
}
return false;
}
bool StyleEngine::UpdateRemUnits(const ComputedStyle* old_root_style,
const ComputedStyle* new_root_style) {
if (!UsesRemUnits())
return false;
if (!old_root_style ||
old_root_style->FontSize() != new_root_style->FontSize()) {
DCHECK(Resolver());
// Resolved rem units are stored in the matched properties cache so we need
// to make sure to invalidate the cache if the documentElement font size
// changes.
Resolver()->InvalidateMatchedPropertiesCache();
return true;
}
return false;
}
void StyleEngine::CustomPropertyRegistered() {
// TODO(timloh): Invalidate only elements with this custom property set
GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange, StyleChangeReasonForTracing::Create(
StyleChangeReason::kPropertyRegistration));
if (resolver_)
resolver_->InvalidateMatchedPropertiesCache();
}
void StyleEngine::EnvironmentVariableChanged() {
GetDocument().SetNeedsStyleRecalc(
kSubtreeStyleChange, StyleChangeReasonForTracing::Create(
StyleChangeReason::kPropertyRegistration));
if (resolver_)
resolver_->InvalidateMatchedPropertiesCache();
}
void StyleEngine::MarkForWhitespaceReattachment() {
for (auto element : whitespace_reattach_set_) {
if (!element->GetLayoutObject())
continue;
element->SetChildNeedsReattachLayoutTree();
element->MarkAncestorsWithChildNeedsReattachLayoutTree();
}
}
void StyleEngine::NodeWillBeRemoved(Node& node) {
if (node.IsElementNode()) {
pending_invalidations_.RescheduleSiblingInvalidationsAsDescendants(
ToElement(node));
}
// Mark closest ancestor with with LayoutObject to have all whitespace
// children being considered for re-attachment during the layout tree build.
LayoutObject* layout_object = node.GetLayoutObject();
// The removed node does not have a layout object. No sibling whitespace nodes
// will change rendering.
if (!layout_object)
return;
// Floating or out-of-flow elements do not affect whitespace siblings.
if (layout_object->IsFloatingOrOutOfFlowPositioned())
return;
layout_object = layout_object->Parent();
while (layout_object->IsAnonymous())
layout_object = layout_object->Parent();
DCHECK(layout_object);
DCHECK(layout_object->GetNode());
if (layout_object->GetNode()->IsElementNode()) {
whitespace_reattach_set_.insert(ToElement(layout_object->GetNode()));
GetDocument().ScheduleLayoutTreeUpdateIfNeeded();
}
}
void StyleEngine::CollectMatchingUserRules(
ElementRuleCollector& collector) const {
for (unsigned i = 0; i < active_user_style_sheets_.size(); ++i) {
DCHECK(active_user_style_sheets_[i].second);
collector.CollectMatchingRules(
MatchRequest(active_user_style_sheets_[i].second, nullptr,
active_user_style_sheets_[i].first, i));
}
}
void StyleEngine::AddFontFaceRules(const RuleSet& rule_set) {
if (!font_selector_)
return;
const HeapVector<Member<StyleRuleFontFace>> font_face_rules =
rule_set.FontFaceRules();
for (auto& font_face_rule : font_face_rules) {
if (FontFace* font_face = FontFace::Create(document_, font_face_rule))
font_selector_->GetFontFaceCache()->Add(font_face_rule, font_face);
}
if (resolver_ && font_face_rules.size())
resolver_->InvalidateMatchedPropertiesCache();
}
void StyleEngine::AddKeyframeRules(const RuleSet& rule_set) {
const HeapVector<Member<StyleRuleKeyframes>> keyframes_rules =
rule_set.KeyframesRules();
for (unsigned i = 0; i < keyframes_rules.size(); ++i)
AddKeyframeStyle(keyframes_rules[i]);
}
void StyleEngine::AddKeyframeStyle(StyleRuleKeyframes* rule) {
AtomicString animation_name(rule->GetName());
if (rule->IsVendorPrefixed()) {
KeyframesRuleMap::iterator it = keyframes_rule_map_.find(animation_name);
if (it == keyframes_rule_map_.end())
keyframes_rule_map_.Set(animation_name, rule);
else if (it->value->IsVendorPrefixed())
keyframes_rule_map_.Set(animation_name, rule);
} else {
keyframes_rule_map_.Set(animation_name, rule);
}
}
StyleRuleKeyframes* StyleEngine::KeyframeStylesForAnimation(
const AtomicString& animation_name) {
if (keyframes_rule_map_.IsEmpty())
return nullptr;
KeyframesRuleMap::iterator it = keyframes_rule_map_.find(animation_name);
if (it == keyframes_rule_map_.end())
return nullptr;
return it->value.Get();
}
DocumentStyleEnvironmentVariables& StyleEngine::EnsureEnvironmentVariables() {
if (!environment_variables_) {
environment_variables_ = DocumentStyleEnvironmentVariables::Create(
StyleEnvironmentVariables::GetRootInstance(), *document_);
}
return *environment_variables_.get();
}
void StyleEngine::Trace(blink::Visitor* visitor) {
visitor->Trace(document_);
visitor->Trace(injected_user_style_sheets_);
visitor->Trace(injected_author_style_sheets_);
visitor->Trace(active_user_style_sheets_);
visitor->Trace(keyframes_rule_map_);
visitor->Trace(inspector_style_sheet_);
visitor->Trace(document_style_sheet_collection_);
visitor->Trace(style_sheet_collection_map_);
visitor->Trace(dirty_tree_scopes_);
visitor->Trace(active_tree_scopes_);
visitor->Trace(tree_boundary_crossing_scopes_);
visitor->Trace(resolver_);
visitor->Trace(viewport_resolver_);
visitor->Trace(media_query_evaluator_);
visitor->Trace(global_rule_set_);
visitor->Trace(pending_invalidations_);
visitor->Trace(whitespace_reattach_set_);
visitor->Trace(font_selector_);
visitor->Trace(text_to_sheet_cache_);
visitor->Trace(sheet_to_text_cache_);
visitor->Trace(tracker_);
FontSelectorClient::Trace(visitor);
}
} // namespace blink