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gecko-dev/layout/style/nsLayoutStylesheetCache.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/. */
#include "nsLayoutStylesheetCache.h"
#include "nsAppDirectoryServiceDefs.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/Preferences.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/Telemetry.h"
#include "mozilla/css/Loader.h"
#include "mozilla/dom/SRIMetadata.h"
#include "MainThreadUtils.h"
#include "nsColor.h"
#include "nsIConsoleService.h"
#include "nsIFile.h"
#include "nsIObserverService.h"
#include "nsIXULRuntime.h"
#include "nsNetUtil.h"
#include "nsPresContext.h"
#include "nsPrintfCString.h"
#include "nsServiceManagerUtils.h"
#include "nsXULAppAPI.h"
using namespace mozilla;
using namespace mozilla::css;
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;
} else {
MOZ_ASSERT_UNREACHABLE("Unexpected observer topic.");
}
return NS_OK;
}
#define STYLE_SHEET(identifier_, url_, lazy_) \
NotNull<StyleSheet*> nsLayoutStylesheetCache::identifier_##Sheet() { \
if (lazy_ && !m##identifier_##Sheet) { \
LoadSheetURL(url_, &m##identifier_##Sheet, eAgentSheetFeatures, eCrash); \
} \
return WrapNotNull(m##identifier_##Sheet); \
}
#include "mozilla/UserAgentStyleSheetList.h"
#undef STYLE_SHEET
StyleSheet* nsLayoutStylesheetCache::GetUserContentSheet() {
return mUserContentSheet;
}
StyleSheet* nsLayoutStylesheetCache::GetUserChromeSheet() {
return mUserChromeSheet;
}
StyleSheet* nsLayoutStylesheetCache::ChromePreferenceSheet(
nsPresContext* aPresContext) {
if (!mChromePreferenceSheet) {
BuildPreferenceSheet(&mChromePreferenceSheet, aPresContext);
}
return mChromePreferenceSheet;
}
StyleSheet* nsLayoutStylesheetCache::ContentPreferenceSheet(
nsPresContext* aPresContext) {
if (!mContentPreferenceSheet) {
BuildPreferenceSheet(&mContentPreferenceSheet, aPresContext);
}
return mContentPreferenceSheet;
}
void nsLayoutStylesheetCache::Shutdown() {
gCSSLoader = nullptr;
NS_WARNING_ASSERTION(!gStyleCache || !gUserContentSheetURL,
"Got the URL but never used?");
gStyleCache = nullptr;
gUserContentSheetURL = nullptr;
}
void nsLayoutStylesheetCache::SetUserContentCSSURL(nsIURI* aURI) {
MOZ_ASSERT(XRE_IsContentProcess(), "Only used in content processes.");
gUserContentSheetURL = aURI;
}
MOZ_DEFINE_MALLOC_SIZE_OF(LayoutStylesheetCacheMallocSizeOf)
NS_IMETHODIMP
nsLayoutStylesheetCache::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool aAnonymize) {
MOZ_COLLECT_REPORT("explicit/layout/style-sheet-cache", KIND_HEAP,
UNITS_BYTES,
SizeOfIncludingThis(LayoutStylesheetCacheMallocSizeOf),
"Memory used for some built-in style sheets.");
return NS_OK;
}
size_t nsLayoutStylesheetCache::SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const {
size_t n = aMallocSizeOf(this);
#define MEASURE(s) n += s ? s->SizeOfIncludingThis(aMallocSizeOf) : 0;
#define STYLE_SHEET(identifier_, url_, lazy_) MEASURE(m##identifier_##Sheet);
#include "mozilla/UserAgentStyleSheetList.h"
#undef STYLE_SHEET
MEASURE(mChromePreferenceSheet);
MEASURE(mContentPreferenceSheet);
MEASURE(mUserChromeSheet);
MEASURE(mUserContentSheet);
// 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.
#define STYLE_SHEET(identifier_, url_, lazy_) \
if (!lazy_) { \
LoadSheetURL(url_, &m##identifier_##Sheet, eAgentSheetFeatures, eCrash); \
}
#include "mozilla/UserAgentStyleSheetList.h"
#undef STYLE_SHEET
if (XRE_IsParentProcess()) {
// We know we need xul.css for the UI, so load that now too:
XULSheet();
}
if (gUserContentSheetURL) {
MOZ_ASSERT(XRE_IsContentProcess(), "Only used in content processes.");
LoadSheet(gUserContentSheetURL, &mUserContentSheet, eUserSheetFeatures,
eLogToConsole);
gUserContentSheetURL = nullptr;
}
// 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);
}
void nsLayoutStylesheetCache::InitMemoryReporter() {
mozilla::RegisterWeakMemoryReporter(this);
}
/* static */ nsLayoutStylesheetCache* nsLayoutStylesheetCache::Singleton() {
MOZ_ASSERT(NS_IsMainThread());
if (!gStyleCache) {
gStyleCache = new nsLayoutStylesheetCache;
gStyleCache->InitMemoryReporter();
// 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.example-pref.enabled");
}
return gStyleCache;
}
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, eUserSheetFeatures,
eLogToConsole);
LoadSheetFile(chromeFile, &mUserChromeSheet, eUserSheetFeatures,
eLogToConsole);
if (XRE_IsParentProcess()) {
// We're interested specifically in potential chrome customizations,
// so we only need data points from the parent process
Telemetry::Accumulate(Telemetry::USER_CHROME_CSS_LOADED,
mUserChromeSheet != nullptr);
}
}
void nsLayoutStylesheetCache::LoadSheetURL(const char* aURL,
RefPtr<StyleSheet>* aSheet,
SheetParsingMode aParsingMode,
FailureAction aFailureAction) {
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), aURL);
LoadSheet(uri, aSheet, aParsingMode, aFailureAction);
if (!aSheet) {
NS_ERROR(nsPrintfCString("Could not load %s", aURL).get());
}
}
void nsLayoutStylesheetCache::LoadSheetFile(nsIFile* aFile,
RefPtr<StyleSheet>* aSheet,
SheetParsingMode aParsingMode,
FailureAction aFailureAction) {
bool exists = false;
aFile->Exists(&exists);
if (!exists) return;
nsCOMPtr<nsIURI> uri;
NS_NewFileURI(getter_AddRefs(uri), aFile);
LoadSheet(uri, aSheet, aParsingMode, aFailureAction);
}
static void ErrorLoadingSheet(nsIURI* aURI, const char* aMsg,
FailureAction aFailureAction) {
nsPrintfCString errorMessage("%s loading built-in stylesheet '%s'", aMsg,
aURI ? aURI->GetSpecOrDefault().get() : "");
if (aFailureAction == eLogToConsole) {
nsCOMPtr<nsIConsoleService> cs =
do_GetService(NS_CONSOLESERVICE_CONTRACTID);
if (cs) {
cs->LogStringMessage(NS_ConvertUTF8toUTF16(errorMessage).get());
return;
}
}
MOZ_CRASH_UNSAFE_OOL(errorMessage.get());
}
void nsLayoutStylesheetCache::LoadSheet(nsIURI* aURI,
RefPtr<StyleSheet>* aSheet,
SheetParsingMode aParsingMode,
FailureAction aFailureAction) {
if (!aURI) {
ErrorLoadingSheet(aURI, "null URI", eCrash);
return;
}
if (!gCSSLoader) {
gCSSLoader = new Loader;
if (!gCSSLoader) {
ErrorLoadingSheet(aURI, "no Loader", eCrash);
return;
}
}
// Note: The parallel parsing code assume that UA sheets are always loaded
// synchronously like they are here, and thus that we'll never attempt
// parallel parsing on them. If that ever changes, we'll either need to find a
// different way to prohibit parallel parsing for UA sheets, or handle
// -moz-bool-pref and various other things in the parallel parsing code.
nsresult rv = gCSSLoader->LoadSheetSync(aURI, aParsingMode, true, aSheet);
if (NS_FAILED(rv)) {
ErrorLoadingSheet(
aURI,
nsPrintfCString("LoadSheetSync failed with error %" PRIx32,
static_cast<uint32_t>(rv))
.get(),
aFailureAction);
}
}
/* static */ void nsLayoutStylesheetCache::InvalidatePreferenceSheets() {
if (gStyleCache) {
gStyleCache->mContentPreferenceSheet = nullptr;
gStyleCache->mChromePreferenceSheet = nullptr;
}
}
void nsLayoutStylesheetCache::BuildPreferenceSheet(
RefPtr<StyleSheet>* aSheet, nsPresContext* aPresContext) {
*aSheet = new StyleSheet(eAgentSheetFeatures, CORS_NONE,
mozilla::net::RP_Unset, dom::SRIMetadata());
StyleSheet* sheet = *aSheet;
nsCOMPtr<nsIURI> uri;
NS_NewURI(getter_AddRefs(uri), "about:PreferenceStyleSheet", nullptr);
MOZ_ASSERT(uri, "URI creation shouldn't fail");
sheet->SetURIs(uri, uri, uri);
sheet->SetComplete();
static const uint32_t kPreallocSize = 1024;
nsCString sheetText;
sheetText.SetCapacity(kPreallocSize);
#define NS_GET_R_G_B(color_) \
NS_GET_R(color_), NS_GET_G(color_), NS_GET_B(color_)
sheetText.AppendLiteral(
"@namespace url(http://www.w3.org/1999/xhtml);\n"
"@namespace svg url(http://www.w3.org/2000/svg);\n");
// Rules for link styling.
nscolor linkColor = aPresContext->DefaultLinkColor();
nscolor activeColor = aPresContext->DefaultActiveLinkColor();
nscolor visitedColor = aPresContext->DefaultVisitedLinkColor();
sheetText.AppendPrintf(
"*|*:link { color: #%02x%02x%02x; }\n"
"*|*:any-link:active { color: #%02x%02x%02x; }\n"
"*|*:visited { color: #%02x%02x%02x; }\n",
NS_GET_R_G_B(linkColor), NS_GET_R_G_B(activeColor),
NS_GET_R_G_B(visitedColor));
bool underlineLinks =
aPresContext->GetCachedBoolPref(kPresContext_UnderlineLinks);
sheetText.AppendPrintf("*|*:any-link%s { text-decoration: %s; }\n",
underlineLinks ? ":not(svg|a)" : "",
underlineLinks ? "underline" : "none");
// Rules for focus styling.
bool focusRingOnAnything = aPresContext->GetFocusRingOnAnything();
uint8_t focusRingWidth = aPresContext->FocusRingWidth();
uint8_t focusRingStyle = aPresContext->GetFocusRingStyle();
if ((focusRingWidth != 1 && focusRingWidth <= 4) || focusRingOnAnything) {
if (focusRingWidth != 1) {
// If the focus ring width is different from the default, fix buttons
// with rings.
sheetText.AppendPrintf(
"button::-moz-focus-inner, input[type=\"reset\"]::-moz-focus-inner, "
"input[type=\"button\"]::-moz-focus-inner, "
"input[type=\"submit\"]::-moz-focus-inner { "
"border: %dpx %s transparent !important; }\n",
focusRingWidth, focusRingStyle == 0 ? "solid" : "dotted");
sheetText.AppendLiteral(
"button:focus::-moz-focus-inner, "
"input[type=\"reset\"]:focus::-moz-focus-inner, "
"input[type=\"button\"]:focus::-moz-focus-inner, "
"input[type=\"submit\"]:focus::-moz-focus-inner { "
"border-color: ButtonText !important; }\n");
}
sheetText.AppendPrintf(
"%s { outline: %dpx %s !important; %s}\n",
focusRingOnAnything ? ":focus" : "*|*:link:focus, *|*:visited:focus",
focusRingWidth,
focusRingStyle == 0 ? // solid
"solid -moz-mac-focusring"
: "dotted WindowText",
focusRingStyle == 0 ? // solid
"-moz-outline-radius: 3px; outline-offset: 1px; "
: "");
}
if (aPresContext->GetUseFocusColors()) {
nscolor focusText = aPresContext->FocusTextColor();
nscolor focusBG = aPresContext->FocusBackgroundColor();
sheetText.AppendPrintf(
"*:focus, *:focus > font { color: #%02x%02x%02x !important; "
"background-color: #%02x%02x%02x !important; }\n",
NS_GET_R_G_B(focusText), NS_GET_R_G_B(focusBG));
}
NS_ASSERTION(sheetText.Length() <= kPreallocSize,
"kPreallocSize should be big enough to build preference style "
"sheet without reallocation");
// NB: The pref sheet never has @import rules, thus no loader.
sheet->ParseSheetSync(nullptr, sheetText,
/* aLoadData = */ nullptr,
/* aLineNumber = */ 0);
#undef NS_GET_R_G_B
}
mozilla::StaticRefPtr<nsLayoutStylesheetCache>
nsLayoutStylesheetCache::gStyleCache;
mozilla::StaticRefPtr<mozilla::css::Loader> nsLayoutStylesheetCache::gCSSLoader;
mozilla::StaticRefPtr<nsIURI> nsLayoutStylesheetCache::gUserContentSheetURL;
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