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Diffstat (limited to 'layout/base/nsStyleSheetService.cpp')
| -rw-r--r-- | layout/base/nsStyleSheetService.cpp | 337 |
1 files changed, 337 insertions, 0 deletions
diff --git a/layout/base/nsStyleSheetService.cpp b/layout/base/nsStyleSheetService.cpp new file mode 100644 index 0000000000..061e03fd9d --- /dev/null +++ b/layout/base/nsStyleSheetService.cpp @@ -0,0 +1,337 @@ +/* -*- 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/. */ + +/* implementation of interface for managing user and user-agent style sheets */ + +#include "nsStyleSheetService.h" +#include "mozilla/MemoryReporting.h" +#include "mozilla/PreloadedStyleSheet.h" +#include "mozilla/PresShell.h" +#include "mozilla/PresShellInlines.h" +#include "mozilla/StyleSheet.h" +#include "mozilla/StyleSheetInlines.h" +#include "mozilla/Unused.h" +#include "mozilla/css/Loader.h" +#include "mozilla/dom/ContentParent.h" +#include "mozilla/dom/Promise.h" +#include "mozilla/ipc/URIUtils.h" +#include "nsIURI.h" +#include "nsCOMPtr.h" +#include "nsISupportsPrimitives.h" +#include "nsISimpleEnumerator.h" +#include "nsNetUtil.h" +#include "nsIConsoleService.h" +#include "nsLayoutStatics.h" +#include "nsLayoutUtils.h" + +using namespace mozilla; + +nsStyleSheetService* nsStyleSheetService::gInstance = nullptr; + +nsStyleSheetService::nsStyleSheetService() { + static_assert(0 == AGENT_SHEET && 1 == USER_SHEET && 2 == AUTHOR_SHEET, + "Convention for Style Sheet"); + NS_ASSERTION(!gInstance, + "Someone is using CreateInstance instead of GetService"); + if (!gInstance) { + gInstance = this; + } + nsLayoutStatics::AddRef(); +} + +nsStyleSheetService::~nsStyleSheetService() { + UnregisterWeakMemoryReporter(this); + + if (gInstance == this) { + gInstance = nullptr; + } + nsLayoutStatics::Release(); +} + +NS_IMPL_ISUPPORTS(nsStyleSheetService, nsIStyleSheetService, nsIMemoryReporter) + +static bool SheetHasURI(StyleSheet* aSheet, nsIURI* aSheetURI) { + MOZ_ASSERT(aSheetURI); + + bool result; + nsIURI* uri = aSheet->GetSheetURI(); + return uri && NS_SUCCEEDED(uri->Equals(aSheetURI, &result)) && result; +} + +int32_t nsStyleSheetService::FindSheetByURI(uint32_t aSheetType, + nsIURI* aSheetURI) { + SheetArray& sheets = mSheets[aSheetType]; + for (int32_t i = sheets.Length() - 1; i >= 0; i--) { + if (SheetHasURI(sheets[i], aSheetURI)) { + return i; + } + } + + return -1; +} + +nsresult nsStyleSheetService::Init() { + // Child processes get their style sheets from the ContentParent. + if (XRE_IsContentProcess()) { + return NS_OK; + } + + RegisterWeakMemoryReporter(this); + + return NS_OK; +} + +NS_IMETHODIMP +nsStyleSheetService::LoadAndRegisterSheet(nsIURI* aSheetURI, + uint32_t aSheetType) { + // Warn developers if their stylesheet URL has a #ref at the end. + // Stylesheet URIs don't benefit from having a #ref suffix -- and if the + // sheet is a data URI, someone might've created this #ref by accident (and + // truncated their data-URI stylesheet) by using an unescaped # character in + // a #RRGGBB color or #foo() ID-selector in their data-URI representation. + bool hasRef; + nsresult rv = aSheetURI->GetHasRef(&hasRef); + NS_ENSURE_SUCCESS(rv, rv); + if (aSheetURI && hasRef) { + nsCOMPtr<nsIConsoleService> consoleService = + do_GetService(NS_CONSOLESERVICE_CONTRACTID); + NS_WARNING_ASSERTION(consoleService, "Failed to get console service!"); + if (consoleService) { + const char16_t* message = + u"nsStyleSheetService::LoadAndRegisterSheet: " + u"URI contains unescaped hash character, which might be truncating " + u"the sheet, if it's a data URI."; + consoleService->LogStringMessage(message); + } + } + + rv = LoadAndRegisterSheetInternal(aSheetURI, aSheetType); + if (NS_SUCCEEDED(rv)) { + // Hold on to a copy of the registered PresShells. + for (PresShell* presShell : mPresShells.Clone()) { + StyleSheet* sheet = mSheets[aSheetType].LastElement(); + presShell->NotifyStyleSheetServiceSheetAdded(sheet, aSheetType); + } + + if (XRE_IsParentProcess()) { + nsTArray<dom::ContentParent*> children; + dom::ContentParent::GetAll(children); + + if (children.IsEmpty()) { + return rv; + } + + for (uint32_t i = 0; i < children.Length(); i++) { + Unused << children[i]->SendLoadAndRegisterSheet(aSheetURI, aSheetType); + } + } + } + return rv; +} + +nsresult nsStyleSheetService::LoadAndRegisterSheetInternal( + nsIURI* aSheetURI, uint32_t aSheetType) { + NS_ENSURE_ARG_POINTER(aSheetURI); + + css::SheetParsingMode parsingMode; + switch (aSheetType) { + case AGENT_SHEET: + parsingMode = css::eAgentSheetFeatures; + break; + + case USER_SHEET: + parsingMode = css::eUserSheetFeatures; + break; + + case AUTHOR_SHEET: + parsingMode = css::eAuthorSheetFeatures; + break; + + default: + NS_WARNING("invalid sheet type argument"); + return NS_ERROR_INVALID_ARG; + } + + RefPtr<css::Loader> loader = new css::Loader; + auto result = loader->LoadSheetSync(aSheetURI, parsingMode, + css::Loader::UseSystemPrincipal::Yes); + if (result.isErr()) { + return result.unwrapErr(); + } + mSheets[aSheetType].AppendElement(result.unwrap()); + return NS_OK; +} + +NS_IMETHODIMP +nsStyleSheetService::SheetRegistered(nsIURI* sheetURI, uint32_t aSheetType, + bool* _retval) { + NS_ENSURE_ARG(aSheetType == AGENT_SHEET || aSheetType == USER_SHEET || + aSheetType == AUTHOR_SHEET); + NS_ENSURE_ARG_POINTER(sheetURI); + MOZ_ASSERT(_retval, "Null out param"); + + // Check to see if we have the sheet. + *_retval = (FindSheetByURI(aSheetType, sheetURI) >= 0); + + return NS_OK; +} + +static nsresult GetParsingMode(uint32_t aSheetType, + css::SheetParsingMode* aParsingMode) { + switch (aSheetType) { + case nsStyleSheetService::AGENT_SHEET: + *aParsingMode = css::eAgentSheetFeatures; + return NS_OK; + + case nsStyleSheetService::USER_SHEET: + *aParsingMode = css::eUserSheetFeatures; + return NS_OK; + + case nsStyleSheetService::AUTHOR_SHEET: + *aParsingMode = css::eAuthorSheetFeatures; + return NS_OK; + + default: + NS_WARNING("invalid sheet type argument"); + return NS_ERROR_INVALID_ARG; + } +} + +NS_IMETHODIMP +nsStyleSheetService::PreloadSheet(nsIURI* aSheetURI, uint32_t aSheetType, + nsIPreloadedStyleSheet** aSheet) { + MOZ_ASSERT(aSheet, "Null out param"); + NS_ENSURE_ARG_POINTER(aSheetURI); + + css::SheetParsingMode parsingMode; + nsresult rv = GetParsingMode(aSheetType, &parsingMode); + NS_ENSURE_SUCCESS(rv, rv); + + auto sheet = MakeRefPtr<PreloadedStyleSheet>(aSheetURI, parsingMode); + NS_ENSURE_SUCCESS(rv, rv); + + rv = sheet->Preload(); + NS_ENSURE_SUCCESS(rv, rv); + + sheet.forget(aSheet); + return NS_OK; +} + +NS_IMETHODIMP +nsStyleSheetService::PreloadSheetAsync(nsIURI* aSheetURI, uint32_t aSheetType, + JSContext* aCx, + JS::MutableHandle<JS::Value> aRval) { + NS_ENSURE_ARG_POINTER(aSheetURI); + + css::SheetParsingMode parsingMode; + nsresult rv = GetParsingMode(aSheetType, &parsingMode); + NS_ENSURE_SUCCESS(rv, rv); + + nsCOMPtr<nsIGlobalObject> global = xpc::CurrentNativeGlobal(aCx); + NS_ENSURE_TRUE(global, NS_ERROR_UNEXPECTED); + + ErrorResult errv; + RefPtr<dom::Promise> promise = dom::Promise::Create(global, errv); + if (errv.Failed()) { + return errv.StealNSResult(); + } + + auto sheet = MakeRefPtr<PreloadedStyleSheet>(aSheetURI, parsingMode); + sheet->PreloadAsync(WrapNotNull(promise)); + + if (!ToJSValue(aCx, promise, aRval)) { + return NS_ERROR_FAILURE; + } + return NS_OK; +} + +NS_IMETHODIMP +nsStyleSheetService::UnregisterSheet(nsIURI* aSheetURI, uint32_t aSheetType) { + NS_ENSURE_ARG(aSheetType == AGENT_SHEET || aSheetType == USER_SHEET || + aSheetType == AUTHOR_SHEET); + NS_ENSURE_ARG_POINTER(aSheetURI); + + RefPtr<StyleSheet> sheet; + int32_t foundIndex = FindSheetByURI(aSheetType, aSheetURI); + if (foundIndex >= 0) { + sheet = mSheets[aSheetType][foundIndex]; + mSheets[aSheetType].RemoveElementAt(foundIndex); + } + + // Hold on to a copy of the registered PresShells. + for (PresShell* presShell : mPresShells.Clone()) { + if (presShell->StyleSet()) { + if (sheet) { + presShell->NotifyStyleSheetServiceSheetRemoved(sheet, aSheetType); + } + } + } + + if (XRE_IsParentProcess()) { + nsTArray<dom::ContentParent*> children; + dom::ContentParent::GetAll(children); + + if (children.IsEmpty()) { + return NS_OK; + } + + for (uint32_t i = 0; i < children.Length(); i++) { + Unused << children[i]->SendUnregisterSheet(aSheetURI, aSheetType); + } + } + + return NS_OK; +} + +// static +nsStyleSheetService* nsStyleSheetService::GetInstance() { + static bool first = true; + if (first) { + // make sure at first call that it's inited + nsCOMPtr<nsIStyleSheetService> dummy = + do_GetService(NS_STYLESHEETSERVICE_CONTRACTID); + first = false; + } + + return gInstance; +} + +MOZ_DEFINE_MALLOC_SIZE_OF(StyleSheetServiceMallocSizeOf) + +NS_IMETHODIMP +nsStyleSheetService::CollectReports(nsIHandleReportCallback* aHandleReport, + nsISupports* aData, bool aAnonymize) { + MOZ_COLLECT_REPORT( + "explicit/layout/style-sheet-service", KIND_HEAP, UNITS_BYTES, + SizeOfIncludingThis(StyleSheetServiceMallocSizeOf), + "Memory used for style sheets held by the style sheet service."); + + return NS_OK; +} + +size_t nsStyleSheetService::SizeOfIncludingThis( + mozilla::MallocSizeOf aMallocSizeOf) const { + size_t n = aMallocSizeOf(this); + for (auto& sheetArray : mSheets) { + n += sheetArray.ShallowSizeOfExcludingThis(aMallocSizeOf); + for (StyleSheet* sheet : sheetArray) { + if (sheet) { + n += sheet->SizeOfIncludingThis(aMallocSizeOf); + } + } + } + return n; +} + +void nsStyleSheetService::RegisterPresShell(PresShell* aPresShell) { + MOZ_ASSERT(!mPresShells.Contains(aPresShell)); + mPresShells.AppendElement(aPresShell); +} + +void nsStyleSheetService::UnregisterPresShell(PresShell* aPresShell) { + MOZ_ASSERT(mPresShells.Contains(aPresShell)); + mPresShells.RemoveElement(aPresShell); +} |