gecko-dev/layout/style/nsLayoutStylesheetCache.cpp

440 строки
11 KiB
C++

/* -*- 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/. */
#include "nsLayoutStylesheetCache.h"
#include "nsAppDirectoryServiceDefs.h"
#include "mozilla/CSSStyleSheet.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/css/Loader.h"
#include "nsIFile.h"
#include "nsNetUtil.h"
#include "nsIObserverService.h"
#include "nsServiceManagerUtils.h"
#include "nsIXULRuntime.h"
#include "nsPrintfCString.h"
using namespace mozilla;
static bool sNumberControlEnabled;
#define NUMBER_CONTROL_PREF "dom.forms.number"
NS_IMPL_ISUPPORTS(
nsLayoutStylesheetCache, nsIObserver, nsIMemoryReporter)
nsresult
nsLayoutStylesheetCache::Observe(nsISupports* aSubject,
const char* aTopic,
const char16_t* aData)
{
if (!strcmp(aTopic, "profile-before-change")) {
mUserContentSheet = nullptr;
mUserChromeSheet = nullptr;
}
else if (!strcmp(aTopic, "profile-do-change")) {
InitFromProfile();
}
else if (strcmp(aTopic, "chrome-flush-skin-caches") == 0 ||
strcmp(aTopic, "chrome-flush-caches") == 0) {
mScrollbarsSheet = nullptr;
mFormsSheet = nullptr;
mNumberControlSheet = nullptr;
}
else {
NS_NOTREACHED("Unexpected observer topic.");
}
return NS_OK;
}
CSSStyleSheet*
nsLayoutStylesheetCache::ScrollbarsSheet()
{
EnsureGlobal();
if (!gStyleCache->mScrollbarsSheet) {
// Scrollbars don't need access to unsafe rules
LoadSheetURL("chrome://global/skin/scrollbars.css",
gStyleCache->mScrollbarsSheet, false);
}
return gStyleCache->mScrollbarsSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::FormsSheet()
{
EnsureGlobal();
if (!gStyleCache->mFormsSheet) {
// forms.css needs access to unsafe rules
LoadSheetURL("resource://gre-resources/forms.css",
gStyleCache->mFormsSheet, true);
}
return gStyleCache->mFormsSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::NumberControlSheet()
{
EnsureGlobal();
if (!sNumberControlEnabled) {
return nullptr;
}
if (!gStyleCache->mNumberControlSheet) {
LoadSheetURL("resource://gre-resources/number-control.css",
gStyleCache->mNumberControlSheet, true);
}
return gStyleCache->mNumberControlSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::UserContentSheet()
{
EnsureGlobal();
return gStyleCache->mUserContentSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::UserChromeSheet()
{
EnsureGlobal();
return gStyleCache->mUserChromeSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::UASheet()
{
EnsureGlobal();
if (!gStyleCache->mUASheet) {
LoadSheetURL("resource://gre-resources/ua.css",
gStyleCache->mUASheet, true);
}
return gStyleCache->mUASheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::HTMLSheet()
{
EnsureGlobal();
if (!gStyleCache->mHTMLSheet) {
LoadSheetURL("resource://gre-resources/html.css",
gStyleCache->mHTMLSheet, true);
}
return gStyleCache->mHTMLSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::MinimalXULSheet()
{
EnsureGlobal();
return gStyleCache->mMinimalXULSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::XULSheet()
{
EnsureGlobal();
return gStyleCache->mXULSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::QuirkSheet()
{
EnsureGlobal();
return gStyleCache->mQuirkSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::FullScreenOverrideSheet()
{
EnsureGlobal();
return gStyleCache->mFullScreenOverrideSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::SVGSheet()
{
EnsureGlobal();
return gStyleCache->mSVGSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::MathMLSheet()
{
EnsureGlobal();
if (!gStyleCache->mMathMLSheet) {
LoadSheetURL("resource://gre-resources/mathml.css",
gStyleCache->mMathMLSheet, true);
}
return gStyleCache->mMathMLSheet;
}
CSSStyleSheet*
nsLayoutStylesheetCache::CounterStylesSheet()
{
EnsureGlobal();
return gStyleCache->mCounterStylesSheet;
}
void
nsLayoutStylesheetCache::Shutdown()
{
NS_IF_RELEASE(gCSSLoader);
gStyleCache = nullptr;
}
MOZ_DEFINE_MALLOC_SIZE_OF(LayoutStylesheetCacheMallocSizeOf)
NS_IMETHODIMP
nsLayoutStylesheetCache::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize)
{
return MOZ_COLLECT_REPORT(
"explicit/layout/style-sheet-cache", KIND_HEAP, UNITS_BYTES,
SizeOfIncludingThis(LayoutStylesheetCacheMallocSizeOf),
"Memory used for some built-in style sheets.");
}
size_t
nsLayoutStylesheetCache::SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const
{
size_t n = aMallocSizeOf(this);
#define MEASURE(s) n += s ? s->SizeOfIncludingThis(aMallocSizeOf) : 0;
MEASURE(mCounterStylesSheet);
MEASURE(mFormsSheet);
MEASURE(mFullScreenOverrideSheet);
MEASURE(mHTMLSheet);
MEASURE(mMathMLSheet);
MEASURE(mMinimalXULSheet);
MEASURE(mNumberControlSheet);
MEASURE(mQuirkSheet);
MEASURE(mSVGSheet);
MEASURE(mScrollbarsSheet);
MEASURE(mUASheet);
MEASURE(mUserChromeSheet);
MEASURE(mUserContentSheet);
MEASURE(mXULSheet);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - gCSSLoader
return n;
}
nsLayoutStylesheetCache::nsLayoutStylesheetCache()
{
nsCOMPtr<nsIObserverService> obsSvc =
mozilla::services::GetObserverService();
NS_ASSERTION(obsSvc, "No global observer service?");
if (obsSvc) {
obsSvc->AddObserver(this, "profile-before-change", false);
obsSvc->AddObserver(this, "profile-do-change", false);
obsSvc->AddObserver(this, "chrome-flush-skin-caches", false);
obsSvc->AddObserver(this, "chrome-flush-caches", false);
}
InitFromProfile();
// And make sure that we load our UA sheets. No need to do this
// per-profile, since they're profile-invariant.
LoadSheetURL("resource://gre-resources/counterstyles.css",
mCounterStylesSheet, true);
LoadSheetURL("resource://gre-resources/full-screen-override.css",
mFullScreenOverrideSheet, true);
LoadSheetURL("chrome://global/content/minimal-xul.css",
mMinimalXULSheet, true);
LoadSheetURL("resource://gre-resources/quirk.css",
mQuirkSheet, true);
LoadSheetURL("resource://gre/res/svg.css",
mSVGSheet, true);
LoadSheetURL("chrome://global/content/xul.css",
mXULSheet, true);
// The remaining sheets are created on-demand do to their use being rarer
// (which helps save memory for Firefox OS apps) or because they need to
// be re-loadable in DependentPrefChanged.
}
nsLayoutStylesheetCache::~nsLayoutStylesheetCache()
{
mozilla::UnregisterWeakMemoryReporter(this);
MOZ_ASSERT(!gStyleCache);
}
void
nsLayoutStylesheetCache::InitMemoryReporter()
{
mozilla::RegisterWeakMemoryReporter(this);
}
void
nsLayoutStylesheetCache::EnsureGlobal()
{
MOZ_ASSERT(NS_IsMainThread());
if (gStyleCache) return;
gStyleCache = new nsLayoutStylesheetCache();
gStyleCache->InitMemoryReporter();
Preferences::AddBoolVarCache(&sNumberControlEnabled, NUMBER_CONTROL_PREF,
true);
// For each pref that controls a CSS feature that a UA style sheet depends
// on (such as a pref that enables a property that a UA style sheet uses),
// register DependentPrefChanged as a callback to ensure that the relevant
// style sheets will be re-parsed.
Preferences::RegisterCallback(&DependentPrefChanged,
"layout.css.ruby.enabled");
}
void
nsLayoutStylesheetCache::InitFromProfile()
{
nsCOMPtr<nsIXULRuntime> appInfo = do_GetService("@mozilla.org/xre/app-info;1");
if (appInfo) {
bool inSafeMode = false;
appInfo->GetInSafeMode(&inSafeMode);
if (inSafeMode)
return;
}
nsCOMPtr<nsIFile> contentFile;
nsCOMPtr<nsIFile> chromeFile;
NS_GetSpecialDirectory(NS_APP_USER_CHROME_DIR,
getter_AddRefs(contentFile));
if (!contentFile) {
// if we don't have a profile yet, that's OK!
return;
}
contentFile->Clone(getter_AddRefs(chromeFile));
if (!chromeFile) return;
contentFile->Append(NS_LITERAL_STRING("userContent.css"));
chromeFile->Append(NS_LITERAL_STRING("userChrome.css"));
LoadSheetFile(contentFile, mUserContentSheet);
LoadSheetFile(chromeFile, mUserChromeSheet);
}
/* static */ void
nsLayoutStylesheetCache::LoadSheetURL(const char* aURL,
nsRefPtr<CSSStyleSheet>& aSheet,
bool aEnableUnsafeRules)
{
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), aURL);
LoadSheet(uri, aSheet, aEnableUnsafeRules);
if (!aSheet) {
NS_ERROR(nsPrintfCString("Could not load %s", aURL).get());
}
}
void
nsLayoutStylesheetCache::LoadSheetFile(nsIFile* aFile, nsRefPtr<CSSStyleSheet>& aSheet)
{
bool exists = false;
aFile->Exists(&exists);
if (!exists) return;
nsCOMPtr<nsIURI> uri;
NS_NewFileURI(getter_AddRefs(uri), aFile);
LoadSheet(uri, aSheet, false);
}
static void
ErrorLoadingBuiltinSheet(nsIURI* aURI, const char* aMsg)
{
nsAutoCString spec;
if (aURI) {
aURI->GetSpec(spec);
}
NS_RUNTIMEABORT(nsPrintfCString("%s loading built-in stylesheet '%s'",
aMsg, spec.get()).get());
}
void
nsLayoutStylesheetCache::LoadSheet(nsIURI* aURI,
nsRefPtr<CSSStyleSheet>& aSheet,
bool aEnableUnsafeRules)
{
if (!aURI) {
ErrorLoadingBuiltinSheet(aURI, "null URI");
return;
}
if (!gCSSLoader) {
gCSSLoader = new mozilla::css::Loader();
NS_IF_ADDREF(gCSSLoader);
if (!gCSSLoader) {
ErrorLoadingBuiltinSheet(aURI, "no Loader");
return;
}
}
nsresult rv = gCSSLoader->LoadSheetSync(aURI, aEnableUnsafeRules, true,
getter_AddRefs(aSheet));
if (NS_FAILED(rv)) {
ErrorLoadingBuiltinSheet(aURI,
nsPrintfCString("LoadSheetSync failed with error %x", rv).get());
}
}
/* static */ void
nsLayoutStylesheetCache::InvalidateSheet(nsRefPtr<CSSStyleSheet>& aSheet)
{
MOZ_ASSERT(gCSSLoader, "pref changed before we loaded a sheet?");
if (aSheet) {
gCSSLoader->ObsoleteSheet(aSheet->GetSheetURI());
aSheet = nullptr;
}
}
/* static */ void
nsLayoutStylesheetCache::DependentPrefChanged(const char* aPref, void* aData)
{
MOZ_ASSERT(gStyleCache, "pref changed after shutdown?");
// Cause any UA style sheets whose parsing depends on the value of prefs
// to be re-parsed by dropping the sheet from gCSSLoader's cache then
// setting our cached sheet pointer to null. This will only work for sheets
// that are loaded lazily.
// for layout.css.ruby.enabled
InvalidateSheet(gStyleCache->mUASheet);
InvalidateSheet(gStyleCache->mHTMLSheet);
}
mozilla::StaticRefPtr<nsLayoutStylesheetCache>
nsLayoutStylesheetCache::gStyleCache;
mozilla::css::Loader*
nsLayoutStylesheetCache::gCSSLoader = nullptr;