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-rw-r--r--layout/style/nsHTMLStyleSheet.cpp182
1 files changed, 182 insertions, 0 deletions
diff --git a/layout/style/nsHTMLStyleSheet.cpp b/layout/style/nsHTMLStyleSheet.cpp
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+++ b/layout/style/nsHTMLStyleSheet.cpp
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * style sheet and style rule processor representing data from presentational
+ * HTML attributes
+ */
+
+#include "nsHTMLStyleSheet.h"
+#include "nsMappedAttributes.h"
+#include "nsGkAtoms.h"
+#include "nsPresContext.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/DocumentInlines.h"
+#include "nsStyleConsts.h"
+#include "nsError.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/dom/Element.h"
+#include "nsHashKeys.h"
+#include "mozilla/OperatorNewExtensions.h"
+#include "mozilla/RestyleManager.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/ServoStyleSet.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+
+// -----------------------------------------------------------
+
+struct MappedAttrTableEntry : public PLDHashEntryHdr {
+ nsMappedAttributes* mAttributes;
+};
+
+static PLDHashNumber MappedAttrTable_HashKey(const void* key) {
+ nsMappedAttributes* attributes =
+ static_cast<nsMappedAttributes*>(const_cast<void*>(key));
+
+ return attributes->HashValue();
+}
+
+static void MappedAttrTable_ClearEntry(PLDHashTable* table,
+ PLDHashEntryHdr* hdr) {
+ MappedAttrTableEntry* entry = static_cast<MappedAttrTableEntry*>(hdr);
+
+ entry->mAttributes->DropStyleSheetReference();
+ memset(entry, 0, sizeof(MappedAttrTableEntry));
+}
+
+static bool MappedAttrTable_MatchEntry(const PLDHashEntryHdr* hdr,
+ const void* key) {
+ nsMappedAttributes* attributes =
+ static_cast<nsMappedAttributes*>(const_cast<void*>(key));
+ const MappedAttrTableEntry* entry =
+ static_cast<const MappedAttrTableEntry*>(hdr);
+
+ return attributes->Equals(entry->mAttributes);
+}
+
+static const PLDHashTableOps MappedAttrTable_Ops = {
+ MappedAttrTable_HashKey, MappedAttrTable_MatchEntry,
+ PLDHashTable::MoveEntryStub, MappedAttrTable_ClearEntry, nullptr};
+
+// -----------------------------------------------------------
+
+// -----------------------------------------------------------
+
+nsHTMLStyleSheet::nsHTMLStyleSheet(Document* aDocument)
+ : mDocument(aDocument),
+ mMappedAttrTable(&MappedAttrTable_Ops, sizeof(MappedAttrTableEntry)),
+ mMappedAttrsDirty(false) {
+ MOZ_ASSERT(aDocument);
+}
+
+void nsHTMLStyleSheet::SetOwningDocument(Document* aDocument) {
+ mDocument = aDocument; // not refcounted
+}
+
+void nsHTMLStyleSheet::Reset() {
+ mServoUnvisitedLinkDecl = nullptr;
+ mServoVisitedLinkDecl = nullptr;
+ mServoActiveLinkDecl = nullptr;
+
+ mMappedAttrTable.Clear();
+ mMappedAttrsDirty = false;
+}
+
+nsresult nsHTMLStyleSheet::ImplLinkColorSetter(
+ RefPtr<StyleLockedDeclarationBlock>& aDecl, nscolor aColor) {
+ if (!mDocument || !mDocument->GetPresShell()) {
+ return NS_OK;
+ }
+
+ MOZ_ASSERT(!ServoStyleSet::IsInServoTraversal());
+ aDecl = Servo_DeclarationBlock_CreateEmpty().Consume();
+ Servo_DeclarationBlock_SetColorValue(aDecl.get(), eCSSProperty_color, aColor);
+
+ // Now make sure we restyle any links that might need it. This
+ // shouldn't happen often, so just rebuilding everything is ok.
+ if (Element* root = mDocument->GetRootElement()) {
+ RestyleManager* rm = mDocument->GetPresContext()->RestyleManager();
+ rm->PostRestyleEvent(root, RestyleHint::RestyleSubtree(), nsChangeHint(0));
+ }
+ return NS_OK;
+}
+
+nsresult nsHTMLStyleSheet::SetLinkColor(nscolor aColor) {
+ return ImplLinkColorSetter(mServoUnvisitedLinkDecl, aColor);
+}
+
+nsresult nsHTMLStyleSheet::SetActiveLinkColor(nscolor aColor) {
+ return ImplLinkColorSetter(mServoActiveLinkDecl, aColor);
+}
+
+nsresult nsHTMLStyleSheet::SetVisitedLinkColor(nscolor aColor) {
+ return ImplLinkColorSetter(mServoVisitedLinkDecl, aColor);
+}
+
+already_AddRefed<nsMappedAttributes> nsHTMLStyleSheet::UniqueMappedAttributes(
+ nsMappedAttributes* aMapped) {
+ mMappedAttrsDirty = true;
+ auto entry = static_cast<MappedAttrTableEntry*>(
+ mMappedAttrTable.Add(aMapped, fallible));
+ if (!entry) return nullptr;
+ if (!entry->mAttributes) {
+ // We added a new entry to the hashtable, so we have a new unique set.
+ entry->mAttributes = aMapped;
+ }
+ RefPtr<nsMappedAttributes> ret = entry->mAttributes;
+ return ret.forget();
+}
+
+void nsHTMLStyleSheet::DropMappedAttributes(nsMappedAttributes* aMapped) {
+ NS_ENSURE_TRUE_VOID(aMapped);
+#ifdef DEBUG
+ uint32_t entryCount = mMappedAttrTable.EntryCount() - 1;
+#endif
+
+ mMappedAttrTable.Remove(aMapped);
+
+ NS_ASSERTION(entryCount == mMappedAttrTable.EntryCount(), "not removed");
+}
+
+void nsHTMLStyleSheet::CalculateMappedServoDeclarations() {
+ for (auto iter = mMappedAttrTable.ConstIter(); !iter.Done(); iter.Next()) {
+ MappedAttrTableEntry* attr = static_cast<MappedAttrTableEntry*>(iter.Get());
+ if (attr->mAttributes->GetServoStyle()) {
+ // Only handle cases which haven't been filled in already
+ continue;
+ }
+ attr->mAttributes->LazilyResolveServoDeclaration(mDocument);
+ }
+}
+
+size_t nsHTMLStyleSheet::DOMSizeOfIncludingThis(
+ MallocSizeOf aMallocSizeOf) const {
+ size_t n = aMallocSizeOf(this);
+
+ n += mMappedAttrTable.ShallowSizeOfExcludingThis(aMallocSizeOf);
+ for (auto iter = mMappedAttrTable.ConstIter(); !iter.Done(); iter.Next()) {
+ auto entry = static_cast<MappedAttrTableEntry*>(iter.Get());
+ n += entry->mAttributes->SizeOfIncludingThis(aMallocSizeOf);
+ }
+
+ // Measurement of the following members may be added later if DMD finds it is
+ // worthwhile:
+ // - mURL
+ // - mLinkRule
+ // - mVisitedRule
+ // - mActiveRule
+ // - mTableQuirkColorRule
+ // - mTableTHRule
+ // - mLangRuleTable
+ //
+ // The following members are not measured:
+ // - mDocument, because it's non-owning
+
+ return n;
+}