The Tor Browser: comparison layout/base/nsPresContext.cpp

--1:000000000000
+:817bf4a95775
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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/. */
+/* a presentation of a document, part 1 */
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStateManager.h"
+#include "base/basictypes.h"
+#include "nsCOMPtr.h"
+#include "nsPresContext.h"
+#include "nsIPresShell.h"
+#include "nsDocShell.h"
+#include "nsIContentViewer.h"
+#include "nsPIDOMWindow.h"
+#include "nsStyleSet.h"
+#include "nsIContent.h"
+#include "nsIFrame.h"
+#include "nsIDocument.h"
+#include "nsIPrintSettings.h"
+#include "nsILanguageAtomService.h"
+#include "mozilla/LookAndFeel.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsAutoPtr.h"
+#include "nsThreadUtils.h"
+#include "nsFrameManager.h"
+#include "nsLayoutUtils.h"
+#include "nsViewManager.h"
+#include "RestyleManager.h"
+#include "nsCSSRuleProcessor.h"
+#include "nsRuleNode.h"
+#include "gfxPlatform.h"
+#include "nsCSSRules.h"
+#include "nsFontFaceLoader.h"
+#include "mozilla/EventListenerManager.h"
+#include "prenv.h"
+#include "nsObjectFrame.h"
+#include "nsTransitionManager.h"
+#include "nsAnimationManager.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/dom/Element.h"
+#include "nsIMessageManager.h"
+#include "mozilla/dom/MediaQueryList.h"
+#include "nsSMILAnimationController.h"
+#include "mozilla/css/ImageLoader.h"
+#include "mozilla/dom/TabChild.h"
+#include "nsRefreshDriver.h"
+#include "Layers.h"
+#include "nsIDOMEvent.h"
+#include "gfxPrefs.h"
+#include "nsString.h"
+#include "nsUnicharUtils.h"
+#include "nsContentUtils.h"
+#include "nsCxPusher.h"
+#include "nsPIWindowRoot.h"
+#include "mozilla/Preferences.h"
+// Needed for Start/Stop of Image Animation
+#include "imgIContainer.h"
+#include "nsIImageLoadingContent.h"
+#include "nsCSSParser.h"
+#include "nsBidiUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "URL.h"
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::layers;
+uint8_t gNotifySubDocInvalidationData;
+/**
+* Layer UserData for ContainerLayers that want to be notified
+* of local invalidations of them and their descendant layers.
+* Pass a callback to ComputeDifferences to have these called.
+*/
+class ContainerLayerPresContext : public LayerUserData {
+public:
+nsPresContext* mPresContext;
+};
+namespace {
+class CharSetChangingRunnable : public nsRunnable
+{
+public:
+CharSetChangingRunnable(nsPresContext* aPresContext,
+const nsCString& aCharSet)
+: mPresContext(aPresContext),
+mCharSet(aCharSet)
+{
+}
+NS_IMETHOD Run()
+{
+mPresContext->DoChangeCharSet(mCharSet);
+return NS_OK;
+}
+private:
+nsRefPtr<nsPresContext> mPresContext;
+nsCString mCharSet;
+};
+} // anonymous namespace
+nscolor
+nsPresContext::MakeColorPref(const nsString& aColor)
+{
+nsCSSParser parser;
+nsCSSValue value;
+if (!parser.ParseColorString(aColor, nullptr, 0, value)) {
+// Any better choices?
+return NS_RGB(0, 0, 0);
+}
+nscolor color;
+return nsRuleNode::ComputeColor(value, this, nullptr, color)
+? color
+: NS_RGB(0, 0, 0);
+}
+bool
+nsPresContext::IsDOMPaintEventPending()
+{
+if (mFireAfterPaintEvents) {
+return true;
+}
+if (GetDisplayRootPresContext()->GetRootPresContext()->mRefreshDriver->ViewManagerFlushIsPending()) {
+// Since we're promising that there will be a MozAfterPaint event
+// fired, we record an empty invalidation in case display list
+// invalidation doesn't invalidate anything further.
+NotifyInvalidation(nsRect(0, 0, 0, 0), 0);
+NS_ASSERTION(mFireAfterPaintEvents, "Why aren't we planning to fire the event?");
+return true;
+}
+return false;
+}
+void
+nsPresContext::PrefChangedCallback(const char* aPrefName, void* instance_data)
+{
+nsRefPtr<nsPresContext>  presContext =
+static_cast<nsPresContext*>(instance_data);
+NS_ASSERTION(nullptr != presContext, "bad instance data");
+if (nullptr != presContext) {
+presContext->PreferenceChanged(aPrefName);
+}
+}
+void
+nsPresContext::PrefChangedUpdateTimerCallback(nsITimer *aTimer, void *aClosure)
+{
+nsPresContext*  presContext = (nsPresContext*)aClosure;
+NS_ASSERTION(presContext != nullptr, "bad instance data");
+if (presContext)
+presContext->UpdateAfterPreferencesChanged();
+}
+static bool
+IsVisualCharset(const nsCString& aCharset)
+{
+if (aCharset.LowerCaseEqualsLiteral("ibm862")             // Hebrew
+|| aCharset.LowerCaseEqualsLiteral("iso-8859-8") ) {  // Hebrew
+return true; // visual text type
+}
+else {
+return false; // logical text type
+}
+}
+// NOTE! nsPresContext::operator new() zeroes out all members, so don't
+// bother initializing members to 0.
+nsPresContext::nsPresContext(nsIDocument* aDocument, nsPresContextType aType)
+: mType(aType), mDocument(aDocument), mBaseMinFontSize(0),
+mTextZoom(1.0), mFullZoom(1.0), mLastFontInflationScreenWidth(-1.0),
+mPageSize(-1, -1), mPPScale(1.0f),
+mViewportStyleOverflow(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO),
+mImageAnimationModePref(imgIContainer::kNormalAnimMode),
+mAllInvalidated(false),
+mPaintFlashing(false), mPaintFlashingInitialized(false)
+{
+// NOTE! nsPresContext::operator new() zeroes out all members, so don't
+// bother initializing members to 0.
+mDoScaledTwips = true;
+SetBackgroundImageDraw(true);		// always draw the background
+SetBackgroundColorDraw(true);
+mBackgroundColor = NS_RGB(0xFF, 0xFF, 0xFF);
+mUseDocumentColors = true;
+mUseDocumentFonts = true;
+// the minimum font-size is unconstrained by default
+mLinkColor = NS_RGB(0x00, 0x00, 0xEE);
+mActiveLinkColor = NS_RGB(0xEE, 0x00, 0x00);
+mVisitedLinkColor = NS_RGB(0x55, 0x1A, 0x8B);
+mUnderlineLinks = true;
+mSendAfterPaintToContent = false;
+mFocusTextColor = mDefaultColor;
+mFocusBackgroundColor = mBackgroundColor;
+mFocusRingWidth = 1;
+mBodyTextColor = mDefaultColor;
+if (aType == eContext_Galley) {
+mMedium = nsGkAtoms::screen;
+} else {
+mMedium = nsGkAtoms::print;
+mPaginated = true;
+}
+mMediaEmulated = mMedium;
+if (!IsDynamic()) {
+mImageAnimationMode = imgIContainer::kDontAnimMode;
+mNeverAnimate = true;
+} else {
+mImageAnimationMode = imgIContainer::kNormalAnimMode;
+mNeverAnimate = false;
+}
+NS_ASSERTION(mDocument, "Null document");
+mUserFontSet = nullptr;
+mUserFontSetDirty = true;
+// if text perf logging enabled, init stats struct
+PRLogModuleInfo *log = gfxPlatform::GetLog(eGfxLog_textperf);
+if (log && log->level >= PR_LOG_WARNING) {
+mTextPerf = new gfxTextPerfMetrics();
+}
+PR_INIT_CLIST(&mDOMMediaQueryLists);
+}
+nsPresContext::~nsPresContext()
+{
+NS_PRECONDITION(!mShell, "Presshell forgot to clear our mShell pointer");
+SetShell(nullptr);
+NS_ABORT_IF_FALSE(PR_CLIST_IS_EMPTY(&mDOMMediaQueryLists),
+"must not have media query lists left");
+// Disconnect the refresh driver *after* the transition manager, which
+// needs it.
+if (mRefreshDriver && mRefreshDriver->PresContext() == this) {
+mRefreshDriver->Disconnect();
+}
+if (mEventManager) {
+// unclear if these are needed, but can't hurt
+mEventManager->NotifyDestroyPresContext(this);
+mEventManager->SetPresContext(nullptr);
+}
+if (mPrefChangedTimer)
+{
+mPrefChangedTimer->Cancel();
+mPrefChangedTimer = nullptr;
+}
+// Unregister preference callbacks
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"font.",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"browser.display.",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"browser.underline_anchors",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"browser.anchor_color",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"browser.active_color",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"browser.visited_color",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"image.animation_mode",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"bidi.",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"dom.send_after_paint_to_content",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"gfx.font_rendering.",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"layout.css.dpi",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"layout.css.devPixelsPerPx",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"nglayout.debug.paint_flashing",
+this);
+Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+"nglayout.debug.paint_flashing_chrome",
+this);
+}
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPresContext)
+NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_ENTRY(nsIObserver)
+NS_INTERFACE_MAP_END
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPresContext)
+NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(nsPresContext, LastRelease())
+void
+nsPresContext::LastRelease()
+{
+if (IsRoot()) {
+static_cast<nsRootPresContext*>(this)->CancelDidPaintTimer();
+}
+}
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsPresContext)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsPresContext)
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument);
+// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mDeviceContext); // not xpcom
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEventManager);
+// NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mLanguage); // an atom
+// We own only the items in mDOMMediaQueryLists that have listeners;
+// this reference is managed by their AddListener and RemoveListener
+// methods.
+for (PRCList *l = PR_LIST_HEAD(&tmp->mDOMMediaQueryLists);
+l != &tmp->mDOMMediaQueryLists; l = PR_NEXT_LINK(l)) {
+MediaQueryList *mql = static_cast<MediaQueryList*>(l);
+if (mql->HasListeners()) {
+NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mDOMMediaQueryLists item");
+cb.NoteXPCOMChild(mql);
+}
+}
+// NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTheme); // a service
+// NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mLangService); // a service
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrintSettings);
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrefChangedTimer);
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsPresContext)
+NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument);
+NS_IMPL_CYCLE_COLLECTION_UNLINK(mDeviceContext); // worth bothering?
+if (tmp->mEventManager) {
+// unclear if these are needed, but can't hurt
+tmp->mEventManager->NotifyDestroyPresContext(tmp);
+tmp->mEventManager->SetPresContext(nullptr);
+tmp->mEventManager = nullptr;
+}
+// We own only the items in mDOMMediaQueryLists that have listeners;
+// this reference is managed by their AddListener and RemoveListener
+// methods.
+for (PRCList *l = PR_LIST_HEAD(&tmp->mDOMMediaQueryLists);
+l != &tmp->mDOMMediaQueryLists; ) {
+PRCList *next = PR_NEXT_LINK(l);
+MediaQueryList *mql = static_cast<MediaQueryList*>(l);
+mql->RemoveAllListeners();
+l = next;
+}
+// NS_RELEASE(tmp->mLanguage); // an atom
+// NS_IMPL_CYCLE_COLLECTION_UNLINK(mTheme); // a service
+// NS_IMPL_CYCLE_COLLECTION_UNLINK(mLangService); // a service
+NS_IMPL_CYCLE_COLLECTION_UNLINK(mPrintSettings);
+if (tmp->mPrefChangedTimer)
+{
+tmp->mPrefChangedTimer->Cancel();
+tmp->mPrefChangedTimer = nullptr;
+}
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+#define MAKE_FONT_PREF_KEY(_pref, _s0, _s1) \
+_pref.Assign(_s0); \
+_pref.Append(_s1);
+static const char* const kGenericFont[] = {
+".variable.",
+".fixed.",
+".serif.",
+".sans-serif.",
+".monospace.",
+".cursive.",
+".fantasy."
+};
+// whether no native theme service exists;
+// if this gets set to true, we'll stop asking for it.
+static bool sNoTheme = false;
+// Set to true when LookAndFeelChanged needs to be called.  This is used
+// because the look and feel is a service, so there's no need to notify it from
+// more than one prescontext.
+static bool sLookAndFeelChanged;
+// Set to true when ThemeChanged needs to be called on mTheme.  This is used
+// because mTheme is a service, so there's no need to notify it from more than
+// one prescontext.
+static bool sThemeChanged;
+const nsPresContext::LangGroupFontPrefs*
+nsPresContext::GetFontPrefsForLang(nsIAtom *aLanguage) const
+{
+// Get language group for aLanguage:
+nsresult rv = NS_OK;
+nsIAtom *langGroupAtom = nullptr;
+if (!aLanguage) {
+aLanguage = mLanguage;
+}
+if (aLanguage && mLangService) {
+langGroupAtom = mLangService->GetLanguageGroup(aLanguage, &rv);
+}
+if (NS_FAILED(rv) || !langGroupAtom) {
+langGroupAtom = nsGkAtoms::x_western; // Assume x-western is safe...
+}
+// Look for cached prefs for this lang group.
+// Most documents will only use one (or very few) language groups. Rather
+// than have the overhead of a hash lookup, we simply look along what will
+// typically be a very short (usually of length 1) linked list. There are 31
+// language groups, so in the worst case scenario we'll need to traverse 31
+// link items.
+LangGroupFontPrefs *prefs =
+const_cast<LangGroupFontPrefs*>(&mLangGroupFontPrefs);
+if (prefs->mLangGroup) { // if initialized
+DebugOnly<uint32_t> count = 0;
+for (;;) {
+NS_ASSERTION(++count < 35, "Lang group count exceeded!!!");
+if (prefs->mLangGroup == langGroupAtom) {
+return prefs;
+}
+if (!prefs->mNext) {
+break;
+}
+prefs = prefs->mNext;
+}
+// nothing cached, so go on and fetch the prefs for this lang group:
+prefs = prefs->mNext = new LangGroupFontPrefs;
+}
+prefs->mLangGroup = langGroupAtom;
+/* Fetch the font prefs to be used -- see bug 61883 for details.
+Not all prefs are needed upfront. Some are fallback prefs intended
+for the GFX font sub-system...
+1) unit : assumed to be the same for all language groups -------------
+font.size.unit = px | pt    XXX could be folded in the size... bug 90440
+2) attributes for generic fonts --------------------------------------
+font.default.[langGroup] = serif | sans-serif - fallback generic font
+font.name.[generic].[langGroup] = current user' selected font on the pref dialog
+font.name-list.[generic].[langGroup] = fontname1, fontname2, ... [factory pre-built list]
+font.size.[generic].[langGroup] = integer - settable by the user
+font.size-adjust.[generic].[langGroup] = "float" - settable by the user
+font.minimum-size.[langGroup] = integer - settable by the user
+*/
+nsAutoCString langGroup;
+langGroupAtom->ToUTF8String(langGroup);
+prefs->mDefaultVariableFont.size = CSSPixelsToAppUnits(16);
+prefs->mDefaultFixedFont.size = CSSPixelsToAppUnits(13);
+nsAutoCString pref;
+// get the current applicable font-size unit
+enum {eUnit_unknown = -1, eUnit_px, eUnit_pt};
+int32_t unit = eUnit_px;
+nsAdoptingCString cvalue =
+Preferences::GetCString("font.size.unit");
+if (!cvalue.IsEmpty()) {
+if (cvalue.Equals("px")) {
+unit = eUnit_px;
+}
+else if (cvalue.Equals("pt")) {
+unit = eUnit_pt;
+}
+else {
+// XXX should really send this warning to the user (Error Console?).
+// And just default to unit = eUnit_px?
+NS_WARNING("unexpected font-size unit -- expected: 'px' or 'pt'");
+unit = eUnit_unknown;
+}
+}
+// get font.minimum-size.[langGroup]
+MAKE_FONT_PREF_KEY(pref, "font.minimum-size.", langGroup);
+int32_t size = Preferences::GetInt(pref.get());
+if (unit == eUnit_px) {
+prefs->mMinimumFontSize = CSSPixelsToAppUnits(size);
+}
+else if (unit == eUnit_pt) {
+prefs->mMinimumFontSize = CSSPointsToAppUnits(size);
+}
+nsFont* fontTypes[] = {
+&prefs->mDefaultVariableFont,
+&prefs->mDefaultFixedFont,
+&prefs->mDefaultSerifFont,
+&prefs->mDefaultSansSerifFont,
+&prefs->mDefaultMonospaceFont,
+&prefs->mDefaultCursiveFont,
+&prefs->mDefaultFantasyFont
+};
+static_assert(MOZ_ARRAY_LENGTH(fontTypes) == eDefaultFont_COUNT,
+"FontTypes array count is not correct");
+// Get attributes specific to each generic font. We do not get the user's
+// generic-font-name-to-specific-family-name preferences because its the
+// generic name that should be fed into the cascade. It is up to the GFX
+// code to look up the font prefs to convert generic names to specific
+// family names as necessary.
+nsAutoCString generic_dot_langGroup;
+for (uint32_t eType = 0; eType < ArrayLength(fontTypes); ++eType) {
+generic_dot_langGroup.Assign(kGenericFont[eType]);
+generic_dot_langGroup.Append(langGroup);
+nsFont* font = fontTypes[eType];
+// set the default variable font (the other fonts are seen as 'generic' fonts
+// in GFX and will be queried there when hunting for alternative fonts)
+if (eType == eDefaultFont_Variable) {
+MAKE_FONT_PREF_KEY(pref, "font.name.variable.", langGroup);
+nsAdoptingString value = Preferences::GetString(pref.get());
+if (!value.IsEmpty()) {
+prefs->mDefaultVariableFont.name.Assign(value);
+}
+else {
+MAKE_FONT_PREF_KEY(pref, "font.default.", langGroup);
+value = Preferences::GetString(pref.get());
+if (!value.IsEmpty()) {
+prefs->mDefaultVariableFont.name.Assign(value);
+}
+}
+}
+else {
+if (eType == eDefaultFont_Monospace) {
+// This takes care of the confusion whereby people often expect "monospace"
+// to have the same default font-size as "-moz-fixed" (this tentative
+// size may be overwritten with the specific value for "monospace" when
+// "font.size.monospace.[langGroup]" is read -- see below)
+prefs->mDefaultMonospaceFont.size = prefs->mDefaultFixedFont.size;
+}
+else if (eType != eDefaultFont_Fixed) {
+// all the other generic fonts are initialized with the size of the
+// variable font, but their specific size can supersede later -- see below
+font->size = prefs->mDefaultVariableFont.size;
+}
+}
+// Bug 84398: for spec purists, a different font-size only applies to the
+// .variable. and .fixed. fonts and the other fonts should get |font-size-adjust|.
+// The problem is that only GfxWin has the support for |font-size-adjust|. So for
+// parity, we enable the ability to set a different font-size on all platforms.
+// get font.size.[generic].[langGroup]
+// size=0 means 'Auto', i.e., generic fonts retain the size of the variable font
+MAKE_FONT_PREF_KEY(pref, "font.size", generic_dot_langGroup);
+size = Preferences::GetInt(pref.get());
+if (size > 0) {
+if (unit == eUnit_px) {
+font->size = CSSPixelsToAppUnits(size);
+}
+else if (unit == eUnit_pt) {
+font->size = CSSPointsToAppUnits(size);
+}
+}
+// get font.size-adjust.[generic].[langGroup]
+// XXX only applicable on GFX ports that handle |font-size-adjust|
+MAKE_FONT_PREF_KEY(pref, "font.size-adjust", generic_dot_langGroup);
+cvalue = Preferences::GetCString(pref.get());
+if (!cvalue.IsEmpty()) {
+font->sizeAdjust = (float)atof(cvalue.get());
+}
+#ifdef DEBUG_rbs
+printf("%s Family-list:%s size:%d sizeAdjust:%.2f\n",
+generic_dot_langGroup.get(),
+NS_ConvertUTF16toUTF8(font->name).get(), font->size,
+font->sizeAdjust);
+#endif
+}
+return prefs;
+}
+void
+nsPresContext::GetDocumentColorPreferences()
+{
+// Make sure the preferences are initialized.  In the normal run,
+// they would already be, because gfxPlatform would have been created,
+// but in some reference tests, that is not the case.
+gfxPrefs::GetSingleton();
+int32_t useAccessibilityTheme = 0;
+bool usePrefColors = true;
+bool isChromeDocShell = false;
+nsIDocument* doc = mDocument->GetDisplayDocument();
+if (doc && doc->GetDocShell()) {
+isChromeDocShell = nsIDocShellTreeItem::typeChrome ==
+doc->GetDocShell()->ItemType();
+} else {
+nsCOMPtr<nsIDocShellTreeItem> docShell(mContainer);
+if (docShell) {
+isChromeDocShell = nsIDocShellTreeItem::typeChrome == docShell->ItemType();
+}
+}
+mIsChromeOriginImage = mDocument->IsBeingUsedAsImage() &&
+IsChromeURI(mDocument->GetDocumentURI());
+if (isChromeDocShell || mIsChromeOriginImage) {
+usePrefColors = false;
+} else {
+useAccessibilityTheme =
+LookAndFeel::GetInt(LookAndFeel::eIntID_UseAccessibilityTheme, 0);
+usePrefColors = !useAccessibilityTheme;
+}
+if (usePrefColors) {
+usePrefColors =
+!Preferences::GetBool("browser.display.use_system_colors", false);
+}
+if (usePrefColors) {
+nsAdoptingString colorStr =
+Preferences::GetString("browser.display.foreground_color");
+if (!colorStr.IsEmpty()) {
+mDefaultColor = MakeColorPref(colorStr);
+}
+colorStr = Preferences::GetString("browser.display.background_color");
+if (!colorStr.IsEmpty()) {
+mBackgroundColor = MakeColorPref(colorStr);
+}
+}
+else {
+mDefaultColor =
+LookAndFeel::GetColor(LookAndFeel::eColorID_WindowForeground,
+NS_RGB(0x00, 0x00, 0x00));
+mBackgroundColor =
+LookAndFeel::GetColor(LookAndFeel::eColorID_WindowBackground,
+NS_RGB(0xFF, 0xFF, 0xFF));
+}
+// Wherever we got the default background color from, ensure it is
+// opaque.
+mBackgroundColor = NS_ComposeColors(NS_RGB(0xFF, 0xFF, 0xFF),
+mBackgroundColor);
+mUseDocumentColors = !useAccessibilityTheme &&
+Preferences::GetBool("browser.display.use_document_colors",
+mUseDocumentColors);
+}
+void
+nsPresContext::GetUserPreferences()
+{
+if (!GetPresShell()) {
+// No presshell means nothing to do here.  We'll do this when we
+// get a presshell.
+return;
+}
+mAutoQualityMinFontSizePixelsPref =
+Preferences::GetInt("browser.display.auto_quality_min_font_size");
+// * document colors
+GetDocumentColorPreferences();
+mSendAfterPaintToContent =
+Preferences::GetBool("dom.send_after_paint_to_content",
+mSendAfterPaintToContent);
+// * link colors
+mUnderlineLinks =
+Preferences::GetBool("browser.underline_anchors", mUnderlineLinks);
+nsAdoptingString colorStr = Preferences::GetString("browser.anchor_color");
+if (!colorStr.IsEmpty()) {
+mLinkColor = MakeColorPref(colorStr);
+}
+colorStr = Preferences::GetString("browser.active_color");
+if (!colorStr.IsEmpty()) {
+mActiveLinkColor = MakeColorPref(colorStr);
+}
+colorStr = Preferences::GetString("browser.visited_color");
+if (!colorStr.IsEmpty()) {
+mVisitedLinkColor = MakeColorPref(colorStr);
+}
+mUseFocusColors =
+Preferences::GetBool("browser.display.use_focus_colors", mUseFocusColors);
+mFocusTextColor = mDefaultColor;
+mFocusBackgroundColor = mBackgroundColor;
+colorStr = Preferences::GetString("browser.display.focus_text_color");
+if (!colorStr.IsEmpty()) {
+mFocusTextColor = MakeColorPref(colorStr);
+}
+colorStr = Preferences::GetString("browser.display.focus_background_color");
+if (!colorStr.IsEmpty()) {
+mFocusBackgroundColor = MakeColorPref(colorStr);
+}
+mFocusRingWidth =
+Preferences::GetInt("browser.display.focus_ring_width", mFocusRingWidth);
+mFocusRingOnAnything =
+Preferences::GetBool("browser.display.focus_ring_on_anything",
+mFocusRingOnAnything);
+mFocusRingStyle =
+Preferences::GetInt("browser.display.focus_ring_style", mFocusRingStyle);
+mBodyTextColor = mDefaultColor;
+// * use fonts?
+mUseDocumentFonts =
+Preferences::GetInt("browser.display.use_document_fonts") != 0;
+mMaxFonts =
+Preferences::GetInt("browser.display.max_font_count", -1);
+mMaxFontAttempts =
+Preferences::GetInt("browser.display.max_font_attempts", -1);
+mPrefScrollbarSide = Preferences::GetInt("layout.scrollbar.side");
+ResetCachedFontPrefs();
+// * image animation
+const nsAdoptingCString& animatePref =
+Preferences::GetCString("image.animation_mode");
+if (animatePref.Equals("normal"))
+mImageAnimationModePref = imgIContainer::kNormalAnimMode;
+else if (animatePref.Equals("none"))
+mImageAnimationModePref = imgIContainer::kDontAnimMode;
+else if (animatePref.Equals("once"))
+mImageAnimationModePref = imgIContainer::kLoopOnceAnimMode;
+else // dynamic change to invalid value should act like it does initially
+mImageAnimationModePref = imgIContainer::kNormalAnimMode;
+uint32_t bidiOptions = GetBidi();
+int32_t prefInt =
+Preferences::GetInt(IBMBIDI_TEXTDIRECTION_STR,
+GET_BIDI_OPTION_DIRECTION(bidiOptions));
+SET_BIDI_OPTION_DIRECTION(bidiOptions, prefInt);
+mPrefBidiDirection = prefInt;
+prefInt =
+Preferences::GetInt(IBMBIDI_TEXTTYPE_STR,
+GET_BIDI_OPTION_TEXTTYPE(bidiOptions));
+SET_BIDI_OPTION_TEXTTYPE(bidiOptions, prefInt);
+prefInt =
+Preferences::GetInt(IBMBIDI_NUMERAL_STR,
+GET_BIDI_OPTION_NUMERAL(bidiOptions));
+SET_BIDI_OPTION_NUMERAL(bidiOptions, prefInt);
+prefInt =
+Preferences::GetInt(IBMBIDI_SUPPORTMODE_STR,
+GET_BIDI_OPTION_SUPPORT(bidiOptions));
+SET_BIDI_OPTION_SUPPORT(bidiOptions, prefInt);
+// We don't need to force reflow: either we are initializing a new
+// prescontext or we are being called from UpdateAfterPreferencesChanged()
+// which triggers a reflow anyway.
+SetBidi(bidiOptions, false);
+}
+void
+nsPresContext::InvalidateThebesLayers()
+{
+if (!mShell)
+return;
+nsIFrame* rootFrame = mShell->FrameManager()->GetRootFrame();
+if (rootFrame) {
+// FrameLayerBuilder caches invalidation-related values that depend on the
+// appunits-per-dev-pixel ratio, so ensure that all ThebesLayer drawing
+// is completely flushed.
+rootFrame->InvalidateFrameSubtree();
+}
+}
+void
+nsPresContext::AppUnitsPerDevPixelChanged()
+{
+InvalidateThebesLayers();
+if (mDeviceContext) {
+mDeviceContext->FlushFontCache();
+}
+if (HasCachedStyleData()) {
+// All cached style data must be recomputed.
+MediaFeatureValuesChanged(eAlwaysRebuildStyle, NS_STYLE_HINT_REFLOW);
+}
+mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
+}
+void
+nsPresContext::PreferenceChanged(const char* aPrefName)
+{
+nsDependentCString prefName(aPrefName);
+if (prefName.EqualsLiteral("layout.css.dpi") ||
+prefName.EqualsLiteral("layout.css.devPixelsPerPx")) {
+int32_t oldAppUnitsPerDevPixel = AppUnitsPerDevPixel();
+if (mDeviceContext->CheckDPIChange() && mShell) {
+nsCOMPtr<nsIPresShell> shell = mShell;
+// Re-fetch the view manager's window dimensions in case there's a deferred
+// resize which hasn't affected our mVisibleArea yet
+nscoord oldWidthAppUnits, oldHeightAppUnits;
+nsRefPtr<nsViewManager> vm = shell->GetViewManager();
+if (!vm) {
+return;
+}
+vm->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
+float oldWidthDevPixels = oldWidthAppUnits/oldAppUnitsPerDevPixel;
+float oldHeightDevPixels = oldHeightAppUnits/oldAppUnitsPerDevPixel;
+nscoord width = NSToCoordRound(oldWidthDevPixels*AppUnitsPerDevPixel());
+nscoord height = NSToCoordRound(oldHeightDevPixels*AppUnitsPerDevPixel());
+vm->SetWindowDimensions(width, height);
+AppUnitsPerDevPixelChanged();
+}
+return;
+}
+if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("font."))) {
+// Changes to font family preferences don't change anything in the
+// computed style data, so the style system won't generate a reflow
+// hint for us.  We need to do that manually.
+// FIXME We could probably also handle changes to
+// browser.display.auto_quality_min_font_size here, but that
+// probably also requires clearing the text run cache, so don't
+// bother (yet, anyway).
+mPrefChangePendingNeedsReflow = true;
+}
+if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("bidi."))) {
+// Changes to bidi prefs need to trigger a reflow (see bug 443629)
+mPrefChangePendingNeedsReflow = true;
+// Changes to bidi.numeral also needs to empty the text run cache.
+// This is handled in gfxTextRunWordCache.cpp.
+}
+if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("gfx.font_rendering."))) {
+// Changes to font_rendering prefs need to trigger a reflow
+mPrefChangePendingNeedsReflow = true;
+}
+// we use a zero-delay timer to coalesce multiple pref updates
+if (!mPrefChangedTimer)
+{
+mPrefChangedTimer = do_CreateInstance("@mozilla.org/timer;1");
+if (!mPrefChangedTimer)
+return;
+mPrefChangedTimer->InitWithFuncCallback(nsPresContext::PrefChangedUpdateTimerCallback, (void*)this, 0, nsITimer::TYPE_ONE_SHOT);
+}
+if (prefName.EqualsLiteral("nglayout.debug.paint_flashing") ||
+prefName.EqualsLiteral("nglayout.debug.paint_flashing_chrome")) {
+mPaintFlashingInitialized = false;
+return;
+}
+}
+void
+nsPresContext::UpdateAfterPreferencesChanged()
+{
+mPrefChangedTimer = nullptr;
+nsCOMPtr<nsIDocShellTreeItem> docShell(mContainer);
+if (docShell && nsIDocShellTreeItem::typeChrome == docShell->ItemType()) {
+return;
+}
+// Initialize our state from the user preferences
+GetUserPreferences();
+// update the presShell: tell it to set the preference style rules up
+if (mShell) {
+mShell->SetPreferenceStyleRules(true);
+}
+InvalidateThebesLayers();
+mDeviceContext->FlushFontCache();
+nsChangeHint hint = nsChangeHint(0);
+if (mPrefChangePendingNeedsReflow) {
+NS_UpdateHint(hint, NS_STYLE_HINT_REFLOW);
+}
+RebuildAllStyleData(hint);
+}
+nsresult
+nsPresContext::Init(nsDeviceContext* aDeviceContext)
+{
+NS_ASSERTION(!mInitialized, "attempt to reinit pres context");
+NS_ENSURE_ARG(aDeviceContext);
+mDeviceContext = aDeviceContext;
+if (mDeviceContext->SetPixelScale(mFullZoom))
+mDeviceContext->FlushFontCache();
+mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
+mEventManager = new mozilla::EventStateManager();
+mTransitionManager = new nsTransitionManager(this);
+mAnimationManager = new nsAnimationManager(this);
+// FIXME: Why is mozilla:: needed?
+mRestyleManager = new mozilla::RestyleManager(this);
+if (mDocument->GetDisplayDocument()) {
+NS_ASSERTION(mDocument->GetDisplayDocument()->GetShell() &&
+mDocument->GetDisplayDocument()->GetShell()->GetPresContext(),
+"Why are we being initialized?");
+mRefreshDriver = mDocument->GetDisplayDocument()->GetShell()->
+GetPresContext()->RefreshDriver();
+} else {
+nsIDocument* parent = mDocument->GetParentDocument();
+// Unfortunately, sometimes |parent| here has no presshell because
+// printing screws up things.  Assert that in other cases it does,
+// but whenever the shell is null just fall back on using our own
+// refresh driver.
+NS_ASSERTION(!parent || mDocument->IsStaticDocument() || parent->GetShell(),
+"How did we end up with a presshell if our parent doesn't "
+"have one?");
+if (parent && parent->GetShell()) {
+NS_ASSERTION(parent->GetShell()->GetPresContext(),
+"How did we get a presshell?");
+// We don't have our container set yet at this point
+nsCOMPtr<nsIDocShellTreeItem> ourItem = mDocument->GetDocShell();
+if (ourItem) {
+nsCOMPtr<nsIDocShellTreeItem> parentItem;
+ourItem->GetSameTypeParent(getter_AddRefs(parentItem));
+if (parentItem) {
+Element* containingElement =
+parent->FindContentForSubDocument(mDocument);
+if (!containingElement->IsXUL() ||
+!containingElement->
+HasAttr(kNameSpaceID_None,
+nsGkAtoms::forceOwnRefreshDriver)) {
+mRefreshDriver = parent->GetShell()->GetPresContext()->RefreshDriver();
+}
+}
+}
+}
+if (!mRefreshDriver) {
+mRefreshDriver = new nsRefreshDriver(this);
+}
+}
+// Initialise refresh tick counters for OMTA
+mLastStyleUpdateForAllAnimations =
+mLastUpdateThrottledAnimationStyle =
+mLastUpdateThrottledTransitionStyle = mRefreshDriver->MostRecentRefresh();
+mLangService = do_GetService(NS_LANGUAGEATOMSERVICE_CONTRACTID);
+// Register callbacks so we're notified when the preferences change
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"font.",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"browser.display.",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"browser.underline_anchors",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"browser.anchor_color",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"browser.active_color",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"browser.visited_color",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"image.animation_mode",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"bidi.",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"dom.send_after_paint_to_content",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"gfx.font_rendering.",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"layout.css.dpi",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"layout.css.devPixelsPerPx",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"nglayout.debug.paint_flashing",
+this);
+Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+"nglayout.debug.paint_flashing_chrome",
+this);
+nsresult rv = mEventManager->Init();
+NS_ENSURE_SUCCESS(rv, rv);
+mEventManager->SetPresContext(this);
+#ifdef DEBUG
+mInitialized = true;
+#endif
+mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THIN] = CSSPixelsToAppUnits(1);
+mBorderWidthTable[NS_STYLE_BORDER_WIDTH_MEDIUM] = CSSPixelsToAppUnits(3);
+mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THICK] = CSSPixelsToAppUnits(5);
+return NS_OK;
+}
+// Note: We don't hold a reference on the shell; it has a reference to
+// us
+void
+nsPresContext::SetShell(nsIPresShell* aShell)
+{
+if (mUserFontSet) {
+// Clear out user font set if we have one
+mUserFontSet->Destroy();
+NS_RELEASE(mUserFontSet);
+}
+if (mShell) {
+// Remove ourselves as the charset observer from the shell's doc, because
+// this shell may be going away for good.
+nsIDocument *doc = mShell->GetDocument();
+if (doc) {
+doc->RemoveCharSetObserver(this);
+}
+}
+mShell = aShell;
+if (mShell) {
+nsIDocument *doc = mShell->GetDocument();
+NS_ASSERTION(doc, "expect document here");
+if (doc) {
+// Have to update PresContext's mDocument before calling any other methods.
+mDocument = doc;
+}
+// Initialize our state from the user preferences, now that we
+// have a presshell, and hence a document.
+GetUserPreferences();
+if (doc) {
+nsIURI *docURI = doc->GetDocumentURI();
+if (IsDynamic() && docURI) {
+bool isChrome = false;
+bool isRes = false;
+docURI->SchemeIs("chrome", &isChrome);
+docURI->SchemeIs("resource", &isRes);
+if (!isChrome && !isRes)
+mImageAnimationMode = mImageAnimationModePref;
+else
+mImageAnimationMode = imgIContainer::kNormalAnimMode;
+}
+if (mLangService) {
+doc->AddCharSetObserver(this);
+UpdateCharSet(doc->GetDocumentCharacterSet());
+}
+}
+} else {
+if (mTransitionManager) {
+mTransitionManager->Disconnect();
+mTransitionManager = nullptr;
+}
+if (mAnimationManager) {
+mAnimationManager->Disconnect();
+mAnimationManager = nullptr;
+}
+if (mRestyleManager) {
+mRestyleManager->Disconnect();
+mRestyleManager = nullptr;
+}
+if (IsRoot()) {
+// Have to cancel our plugin geometry timer, because the
+// callback for that depends on a non-null presshell.
+static_cast<nsRootPresContext*>(this)->CancelApplyPluginGeometryTimer();
+}
+}
+}
+void
+nsPresContext::DoChangeCharSet(const nsCString& aCharSet)
+{
+UpdateCharSet(aCharSet);
+mDeviceContext->FlushFontCache();
+RebuildAllStyleData(NS_STYLE_HINT_REFLOW);
+}
+void
+nsPresContext::UpdateCharSet(const nsCString& aCharSet)
+{
+if (mLangService) {
+mLanguage = mLangService->LookupCharSet(aCharSet.get());
+// this will be a language group (or script) code rather than a true language code
+// bug 39570: moved from nsLanguageAtomService::LookupCharSet()
+if (mLanguage == nsGkAtoms::Unicode) {
+mLanguage = mLangService->GetLocaleLanguage();
+}
+ResetCachedFontPrefs();
+}
+switch (GET_BIDI_OPTION_TEXTTYPE(GetBidi())) {
+case IBMBIDI_TEXTTYPE_LOGICAL:
+SetVisualMode(false);
+break;
+case IBMBIDI_TEXTTYPE_VISUAL:
+SetVisualMode(true);
+break;
+case IBMBIDI_TEXTTYPE_CHARSET:
+default:
+SetVisualMode(IsVisualCharset(aCharSet));
+}
+}
+NS_IMETHODIMP
+nsPresContext::Observe(nsISupports* aSubject,
+const char* aTopic,
+const char16_t* aData)
+{
+if (!nsCRT::strcmp(aTopic, "charset")) {
+nsRefPtr<CharSetChangingRunnable> runnable =
+new CharSetChangingRunnable(this, NS_LossyConvertUTF16toASCII(aData));
+return NS_DispatchToCurrentThread(runnable);
+}
+NS_WARNING("unrecognized topic in nsPresContext::Observe");
+return NS_ERROR_FAILURE;
+}
+nsPresContext*
+nsPresContext::GetParentPresContext()
+{
+nsIPresShell* shell = GetPresShell();
+if (shell) {
+nsViewManager* viewManager = shell->GetViewManager();
+if (viewManager) {
+nsView* view = viewManager->GetRootView();
+if (view) {
+view = view->GetParent(); // anonymous inner view
+if (view) {
+view = view->GetParent(); // subdocumentframe's view
+if (view) {
+nsIFrame* f = view->GetFrame();
+if (f) {
+return f->PresContext();
+}
+}
+}
+}
+}
+}
+return nullptr;
+}
+nsPresContext*
+nsPresContext::GetToplevelContentDocumentPresContext()
+{
+if (IsChrome())
+return nullptr;
+nsPresContext* pc = this;
+for (;;) {
+nsPresContext* parent = pc->GetParentPresContext();
+if (!parent || parent->IsChrome())
+return pc;
+pc = parent;
+}
+}
+nsIWidget*
+nsPresContext::GetNearestWidget(nsPoint* aOffset)
+{
+NS_ENSURE_TRUE(mShell, nullptr);
+nsIFrame* frame = mShell->GetRootFrame();
+NS_ENSURE_TRUE(frame, nullptr);
+return frame->GetView()->GetNearestWidget(aOffset);
+}
+nsIWidget*
+nsPresContext::GetRootWidget()
+{
+NS_ENSURE_TRUE(mShell, nullptr);
+nsViewManager* vm = mShell->GetViewManager();
+if (!vm) {
+return nullptr;
+}
+nsCOMPtr<nsIWidget> widget;
+vm->GetRootWidget(getter_AddRefs(widget));
+return widget.get();
+}
+// We may want to replace this with something faster, maybe caching the root prescontext
+nsRootPresContext*
+nsPresContext::GetRootPresContext()
+{
+nsPresContext* pc = this;
+for (;;) {
+nsPresContext* parent = pc->GetParentPresContext();
+if (!parent)
+break;
+pc = parent;
+}
+return pc->IsRoot() ? static_cast<nsRootPresContext*>(pc) : nullptr;
+}
+nsRootPresContext*
+nsPresContext::GetDisplayRootPresContext()
+{
+nsPresContext* pc = this;
+for (;;) {
+nsPresContext* parent = pc->GetParentPresContext();
+if (!parent) {
+// Not sure if this is always strictly the parent, but it works for GetRootPresContext
+// where the current pres context has no frames.
+nsIDocument *doc = pc->Document();
+if (doc) {
+doc = doc->GetParentDocument();
+if (doc) {
+nsIPresShell* shell = doc->GetShell();
+if (shell) {
+parent = shell->GetPresContext();
+}
+}
+}
+}
+if (!parent || parent == pc)
+break;
+pc = parent;
+}
+return pc->IsRoot() ? static_cast<nsRootPresContext*>(pc) : nullptr;
+}
+void
+nsPresContext::CompatibilityModeChanged()
+{
+if (!mShell)
+return;
+// enable/disable the QuirkSheet
+mShell->StyleSet()->
+EnableQuirkStyleSheet(CompatibilityMode() == eCompatibility_NavQuirks);
+}
+// Helper function for setting Anim Mode on image
+static void SetImgAnimModeOnImgReq(imgIRequest* aImgReq, uint16_t aMode)
+{
+if (aImgReq) {
+nsCOMPtr<imgIContainer> imgCon;
+aImgReq->GetImage(getter_AddRefs(imgCon));
+if (imgCon) {
+imgCon->SetAnimationMode(aMode);
+}
+}
+}
+// IMPORTANT: Assumption is that all images for a Presentation
+// have the same Animation Mode (pavlov said this was OK)
+//
+// Walks content and set the animation mode
+// this is a way to turn on/off image animations
+void nsPresContext::SetImgAnimations(nsIContent *aParent, uint16_t aMode)
+{
+nsCOMPtr<nsIImageLoadingContent> imgContent(do_QueryInterface(aParent));
+if (imgContent) {
+nsCOMPtr<imgIRequest> imgReq;
+imgContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
+getter_AddRefs(imgReq));
+SetImgAnimModeOnImgReq(imgReq, aMode);
+}
+uint32_t count = aParent->GetChildCount();
+for (uint32_t i = 0; i < count; ++i) {
+SetImgAnimations(aParent->GetChildAt(i), aMode);
+}
+}
+void
+nsPresContext::SetSMILAnimations(nsIDocument *aDoc, uint16_t aNewMode,
+uint16_t aOldMode)
+{
+if (aDoc->HasAnimationController()) {
+nsSMILAnimationController* controller = aDoc->GetAnimationController();
+switch (aNewMode)
+{
+case imgIContainer::kNormalAnimMode:
+case imgIContainer::kLoopOnceAnimMode:
+if (aOldMode == imgIContainer::kDontAnimMode)
+controller->Resume(nsSMILTimeContainer::PAUSE_USERPREF);
+break;
+case imgIContainer::kDontAnimMode:
+if (aOldMode != imgIContainer::kDontAnimMode)
+controller->Pause(nsSMILTimeContainer::PAUSE_USERPREF);
+break;
+}
+}
+}
+void
+nsPresContext::SetImageAnimationModeInternal(uint16_t aMode)
+{
+NS_ASSERTION(aMode == imgIContainer::kNormalAnimMode ||
+aMode == imgIContainer::kDontAnimMode ||
+aMode == imgIContainer::kLoopOnceAnimMode, "Wrong Animation Mode is being set!");
+// Image animation mode cannot be changed when rendering to a printer.
+if (!IsDynamic())
+return;
+// Now walk the content tree and set the animation mode
+// on all the images.
+if (mShell != nullptr) {
+nsIDocument *doc = mShell->GetDocument();
+if (doc) {
+doc->StyleImageLoader()->SetAnimationMode(aMode);
+Element *rootElement = doc->GetRootElement();
+if (rootElement) {
+SetImgAnimations(rootElement, aMode);
+}
+SetSMILAnimations(doc, aMode, mImageAnimationMode);
+}
+}
+mImageAnimationMode = aMode;
+}
+void
+nsPresContext::SetImageAnimationModeExternal(uint16_t aMode)
+{
+SetImageAnimationModeInternal(aMode);
+}
+const nsFont*
+nsPresContext::GetDefaultFont(uint8_t aFontID, nsIAtom *aLanguage) const
+{
+const LangGroupFontPrefs *prefs = GetFontPrefsForLang(aLanguage);
+const nsFont *font;
+switch (aFontID) {
+// Special (our default variable width font and fixed width font)
+case kPresContext_DefaultVariableFont_ID:
+font = &prefs->mDefaultVariableFont;
+break;
+case kPresContext_DefaultFixedFont_ID:
+font = &prefs->mDefaultFixedFont;
+break;
+// CSS
+case kGenericFont_serif:
+font = &prefs->mDefaultSerifFont;
+break;
+case kGenericFont_sans_serif:
+font = &prefs->mDefaultSansSerifFont;
+break;
+case kGenericFont_monospace:
+font = &prefs->mDefaultMonospaceFont;
+break;
+case kGenericFont_cursive:
+font = &prefs->mDefaultCursiveFont;
+break;
+case kGenericFont_fantasy:
+font = &prefs->mDefaultFantasyFont;
+break;
+default:
+font = nullptr;
+NS_ERROR("invalid arg");
+break;
+}
+return font;
+}
+PRBool
+nsPresContext::FontUseCountReached(const nsFont &font) {
+if (mMaxFonts < 0) {
+return PR_FALSE;
+}
+for (PRUint32 i = 0; i < mFontsUsed.Length(); i++) {
+if (mFontsUsed[i].name.Equals(font.name,
+nsCaseInsensitiveStringComparator())
+// XXX: Style is sometimes filled with garbage??
+/*&& mFontsUsed[i].style == font.style*/) {
+// seen it before: OK
+return PR_FALSE;
+}
+}
+if (mFontsUsed.Length() >= (unsigned)mMaxFonts) {
+return PR_TRUE;
+}
+return PR_FALSE;
+}
+PRBool
+nsPresContext::FontAttemptCountReached(const nsFont &font) {
+if (mMaxFontAttempts < 0) {
+return PR_FALSE;
+}
+for (PRUint32 i = 0; i < mFontsTried.Length(); i++) {
+if (mFontsTried[i].name.Equals(font.name,
+nsCaseInsensitiveStringComparator())
+// XXX: Style is sometimes filled with garbage??
+/*&& mFontsTried[i].style == font.style*/) {
+// seen it before: OK
+return PR_FALSE;
+}
+}
+if (mFontsTried.Length() >= (unsigned)mMaxFontAttempts) {
+return PR_TRUE;
+}
+return PR_FALSE;
+}
+void
+nsPresContext::AddFontUse(const nsFont &font) {
+if (mMaxFonts < 0) {
+return;
+}
+for (PRUint32 i = 0; i < mFontsUsed.Length(); i++) {
+if (mFontsUsed[i].name.Equals(font.name,
+nsCaseInsensitiveStringComparator())
+// XXX: Style is sometimes filled with garbage??
+/*&& mFontsUsed[i].style == font.style*/) {
+// seen it before: OK
+return;
+}
+}
+if (mFontsUsed.Length() >= (unsigned)mMaxFonts) {
+return;
+}
+mFontsUsed.AppendElement(font);
+return;
+}
+void
+nsPresContext::AddFontAttempt(const nsFont &font) {
+if (mMaxFontAttempts < 0) {
+return;
+}
+for (PRUint32 i = 0; i < mFontsTried.Length(); i++) {
+if (mFontsTried[i].name.Equals(font.name,
+nsCaseInsensitiveStringComparator())
+// XXX: Style is sometimes filled with garbage??
+/*&& mFontsTried[i].style == font.style*/) {
+// seen it before: OK
+return;
+}
+}
+if (mFontsTried.Length() >= (unsigned)mMaxFontAttempts) {
+return;
+}
+mFontsTried.AppendElement(font);
+return;
+}
+void
+nsPresContext::SetFullZoom(float aZoom)
+{
+if (!mShell || mFullZoom == aZoom) {
+return;
+}
+// Re-fetch the view manager's window dimensions in case there's a deferred
+// resize which hasn't affected our mVisibleArea yet
+nscoord oldWidthAppUnits, oldHeightAppUnits;
+mShell->GetViewManager()->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
+float oldWidthDevPixels = oldWidthAppUnits / float(mCurAppUnitsPerDevPixel);
+float oldHeightDevPixels = oldHeightAppUnits / float(mCurAppUnitsPerDevPixel);
+mDeviceContext->SetPixelScale(aZoom);
+NS_ASSERTION(!mSupressResizeReflow, "two zooms happening at the same time? impossible!");
+mSupressResizeReflow = true;
+mFullZoom = aZoom;
+mShell->GetViewManager()->
+SetWindowDimensions(NSToCoordRound(oldWidthDevPixels * AppUnitsPerDevPixel()),
+NSToCoordRound(oldHeightDevPixels * AppUnitsPerDevPixel()));
+AppUnitsPerDevPixelChanged();
+mSupressResizeReflow = false;
+}
+float
+nsPresContext::ScreenWidthInchesForFontInflation(bool* aChanged)
+{
+if (aChanged) {
+*aChanged = false;
+}
+nsDeviceContext *dx = DeviceContext();
+nsRect clientRect;
+dx->GetClientRect(clientRect); // FIXME: GetClientRect looks expensive
+float deviceWidthInches =
+float(clientRect.width) / float(dx->AppUnitsPerPhysicalInch());
+if (mLastFontInflationScreenWidth == -1.0) {
+mLastFontInflationScreenWidth = deviceWidthInches;
+}
+if (deviceWidthInches != mLastFontInflationScreenWidth && aChanged) {
+*aChanged = true;
+mLastFontInflationScreenWidth = deviceWidthInches;
+}
+return deviceWidthInches;
+}
+void
+nsPresContext::SetContainer(nsIDocShell* aDocShell)
+{
+if (aDocShell) {
+mContainer = static_cast<nsDocShell*>(aDocShell)->asWeakPtr();
+} else {
+mContainer = WeakPtr<nsDocShell>();
+}
+UpdateIsChrome();
+if (mContainer) {
+GetDocumentColorPreferences();
+}
+}
+nsISupports*
+nsPresContext::GetContainerWeakInternal() const
+{
+return static_cast<nsIDocShell*>(mContainer);
+}
+nsISupports*
+nsPresContext::GetContainerWeakExternal() const
+{
+return GetContainerWeakInternal();
+}
+nsIDocShell*
+nsPresContext::GetDocShell() const
+{
+return mContainer;
+}
+/* virtual */ void
+nsPresContext::Detach()
+{
+SetContainer(nullptr);
+SetLinkHandler(nullptr);
+if (mShell) {
+mShell->CancelInvalidatePresShellIfHidden();
+}
+}
+bool
+nsPresContext::ThrottledTransitionStyleIsUpToDate() const
+{
+return
+mLastUpdateThrottledTransitionStyle == mRefreshDriver->MostRecentRefresh();
+}
+void
+nsPresContext::TickLastUpdateThrottledTransitionStyle()
+{
+mLastUpdateThrottledTransitionStyle = mRefreshDriver->MostRecentRefresh();
+}
+bool
+nsPresContext::ThrottledAnimationStyleIsUpToDate() const
+{
+return
+mLastUpdateThrottledAnimationStyle == mRefreshDriver->MostRecentRefresh();
+}
+void
+nsPresContext::TickLastUpdateThrottledAnimationStyle()
+{
+mLastUpdateThrottledAnimationStyle = mRefreshDriver->MostRecentRefresh();
+}
+bool
+nsPresContext::StyleUpdateForAllAnimationsIsUpToDate()
+{
+return mLastStyleUpdateForAllAnimations == mRefreshDriver->MostRecentRefresh();
+}
+void
+nsPresContext::TickLastStyleUpdateForAllAnimations()
+{
+mLastStyleUpdateForAllAnimations = mRefreshDriver->MostRecentRefresh();
+}
+bool
+nsPresContext::BidiEnabledExternal() const
+{
+return BidiEnabledInternal();
+}
+bool
+nsPresContext::BidiEnabledInternal() const
+{
+return Document()->GetBidiEnabled();
+}
+void
+nsPresContext::SetBidiEnabled() const
+{
+if (mShell) {
+nsIDocument *doc = mShell->GetDocument();
+if (doc) {
+doc->SetBidiEnabled();
+}
+}
+}
+void
+nsPresContext::SetBidi(uint32_t aSource, bool aForceRestyle)
+{
+// Don't do all this stuff unless the options have changed.
+if (aSource == GetBidi()) {
+return;
+}
+NS_ASSERTION(!(aForceRestyle && (GetBidi() == 0)),
+"ForceReflow on new prescontext");
+Document()->SetBidiOptions(aSource);
+if (IBMBIDI_TEXTDIRECTION_RTL == GET_BIDI_OPTION_DIRECTION(aSource)
+|| IBMBIDI_NUMERAL_HINDI == GET_BIDI_OPTION_NUMERAL(aSource)) {
+SetBidiEnabled();
+}
+if (IBMBIDI_TEXTTYPE_VISUAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
+SetVisualMode(true);
+}
+else if (IBMBIDI_TEXTTYPE_LOGICAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
+SetVisualMode(false);
+}
+else {
+nsIDocument* doc = mShell->GetDocument();
+if (doc) {
+SetVisualMode(IsVisualCharset(doc->GetDocumentCharacterSet()));
+}
+}
+if (aForceRestyle && mShell) {
+// Reconstruct the root document element's frame and its children,
+// because we need to trigger frame reconstruction for direction change.
+RebuildUserFontSet();
+mShell->ReconstructFrames();
+}
+}
+uint32_t
+nsPresContext::GetBidi() const
+{
+return Document()->GetBidiOptions();
+}
+bool
+nsPresContext::IsTopLevelWindowInactive()
+{
+nsCOMPtr<nsIDocShellTreeItem> treeItem(mContainer);
+if (!treeItem)
+return false;
+nsCOMPtr<nsIDocShellTreeItem> rootItem;
+treeItem->GetRootTreeItem(getter_AddRefs(rootItem));
+nsCOMPtr<nsPIDOMWindow> domWindow(do_GetInterface(rootItem));
+return domWindow && !domWindow->IsActive();
+}
+nsITheme*
+nsPresContext::GetTheme()
+{
+if (!sNoTheme && !mTheme) {
+mTheme = do_GetService("@mozilla.org/chrome/chrome-native-theme;1");
+if (!mTheme)
+sNoTheme = true;
+}
+return mTheme;
+}
+void
+nsPresContext::ThemeChanged()
+{
+if (!mPendingThemeChanged) {
+sLookAndFeelChanged = true;
+sThemeChanged = true;
+nsCOMPtr<nsIRunnable> ev =
+NS_NewRunnableMethod(this, &nsPresContext::ThemeChangedInternal);
+if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+mPendingThemeChanged = true;
+}
+}
+}
+void
+nsPresContext::ThemeChangedInternal()
+{
+mPendingThemeChanged = false;
+// Tell the theme that it changed, so it can flush any handles to stale theme
+// data.
+if (mTheme && sThemeChanged) {
+mTheme->ThemeChanged();
+sThemeChanged = false;
+}
+// Clear all cached LookAndFeel colors.
+if (sLookAndFeelChanged) {
+LookAndFeel::Refresh();
+sLookAndFeelChanged = false;
+}
+// This will force the system metrics to be generated the next time they're used
+nsCSSRuleProcessor::FreeSystemMetrics();
+// Changes to system metrics can change media queries on them.
+// Changes in theme can change system colors (whose changes are
+// properly reflected in computed style data), system fonts (whose
+// changes are not), and -moz-appearance (whose changes likewise are
+// not), so we need to reflow.
+MediaFeatureValuesChanged(eAlwaysRebuildStyle, NS_STYLE_HINT_REFLOW);
+}
+void
+nsPresContext::SysColorChanged()
+{
+if (!mPendingSysColorChanged) {
+sLookAndFeelChanged = true;
+nsCOMPtr<nsIRunnable> ev =
+NS_NewRunnableMethod(this, &nsPresContext::SysColorChangedInternal);
+if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+mPendingSysColorChanged = true;
+}
+}
+}
+void
+nsPresContext::SysColorChangedInternal()
+{
+mPendingSysColorChanged = false;
+if (sLookAndFeelChanged) {
+// Don't use the cached values for the system colors
+LookAndFeel::Refresh();
+sLookAndFeelChanged = false;
+}
+// Reset default background and foreground colors for the document since
+// they may be using system colors
+GetDocumentColorPreferences();
+// The system color values are computed to colors in the style data,
+// so normal style data comparison is sufficient here.
+RebuildAllStyleData(nsChangeHint(0));
+}
+void
+nsPresContext::UIResolutionChanged()
+{
+if (!mPendingUIResolutionChanged) {
+nsCOMPtr<nsIRunnable> ev =
+NS_NewRunnableMethod(this, &nsPresContext::UIResolutionChangedInternal);
+if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+mPendingUIResolutionChanged = true;
+}
+}
+}
+/*static*/ bool
+nsPresContext::UIResolutionChangedSubdocumentCallback(nsIDocument* aDocument,
+void* aData)
+{
+nsIPresShell* shell = aDocument->GetShell();
+if (shell) {
+nsPresContext* pc = shell->GetPresContext();
+if (pc) {
+pc->UIResolutionChangedInternal();
+}
+}
+return true;
+}
+void
+nsPresContext::UIResolutionChangedInternal()
+{
+mPendingUIResolutionChanged = false;
+mDeviceContext->CheckDPIChange();
+if (mCurAppUnitsPerDevPixel != AppUnitsPerDevPixel()) {
+AppUnitsPerDevPixelChanged();
+}
+mDocument->EnumerateSubDocuments(UIResolutionChangedSubdocumentCallback,
+nullptr);
+}
+void
+nsPresContext::EmulateMedium(const nsAString& aMediaType)
+{
+nsIAtom* previousMedium = Medium();
+mIsEmulatingMedia = true;
+nsAutoString mediaType;
+nsContentUtils::ASCIIToLower(aMediaType, mediaType);
+mMediaEmulated = do_GetAtom(mediaType);
+if (mMediaEmulated != previousMedium && mShell) {
+MediaFeatureValuesChanged(eRebuildStyleIfNeeded, nsChangeHint(0));
+}
+}
+void nsPresContext::StopEmulatingMedium()
+{
+nsIAtom* previousMedium = Medium();
+mIsEmulatingMedia = false;
+if (Medium() != previousMedium) {
+MediaFeatureValuesChanged(eRebuildStyleIfNeeded, nsChangeHint(0));
+}
+}
+void
+nsPresContext::RebuildAllStyleData(nsChangeHint aExtraHint)
+{
+if (!mShell) {
+// We must have been torn down. Nothing to do here.
+return;
+}
+mUsesRootEMUnits = false;
+mUsesViewportUnits = false;
+RebuildUserFontSet();
+RestyleManager()->RebuildAllStyleData(aExtraHint);
+}
+void
+nsPresContext::PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint)
+{
+if (!mShell) {
+// We must have been torn down. Nothing to do here.
+return;
+}
+RestyleManager()->PostRebuildAllStyleDataEvent(aExtraHint);
+}
+void
+nsPresContext::MediaFeatureValuesChanged(StyleRebuildType aShouldRebuild,
+nsChangeHint aChangeHint)
+{
+NS_ASSERTION(aShouldRebuild == eAlwaysRebuildStyle || aChangeHint == 0,
+"If you don't know if we need a rebuild, how can you provide a hint?");
+mPendingMediaFeatureValuesChanged = false;
+// MediumFeaturesChanged updates the applied rules, so it always gets called.
+bool mediaFeaturesDidChange = mShell ? mShell->StyleSet()->MediumFeaturesChanged(this)
+: false;
+if (aShouldRebuild == eAlwaysRebuildStyle ||
+mediaFeaturesDidChange ||
+(mUsesViewportUnits && mPendingViewportChange)) {
+RebuildAllStyleData(aChangeHint);
+}
+mPendingViewportChange = false;
+if (!nsContentUtils::IsSafeToRunScript()) {
+NS_ABORT_IF_FALSE(mDocument->IsBeingUsedAsImage(),
+"How did we get here?  Are we failing to notify "
+"listeners that we should notify?");
+return;
+}
+// Media query list listeners should be notified from a queued task
+// (in HTML5 terms), although we also want to notify them on certain
+// flushes.  (We're already running off an event.)
+//
+// Note that we do this after the new style from media queries in
+// style sheets has been computed.
+if (!PR_CLIST_IS_EMPTY(&mDOMMediaQueryLists)) {
+// We build a list of all the notifications we're going to send
+// before we send any of them.  (The spec says the notifications
+// should be a queued task, so any removals that happen during the
+// notifications shouldn't affect what gets notified.)  Furthermore,
+// we hold strong pointers to everything we're going to make
+// notification calls to, since each notification involves calling
+// arbitrary script that might otherwise destroy these objects, or,
+// for that matter, |this|.
+//
+// Note that we intentionally send the notifications to media query
+// list in the order they were created and, for each list, to the
+// listeners in the order added.
+MediaQueryList::NotifyList notifyList;
+for (PRCList *l = PR_LIST_HEAD(&mDOMMediaQueryLists);
+l != &mDOMMediaQueryLists; l = PR_NEXT_LINK(l)) {
+MediaQueryList *mql = static_cast<MediaQueryList*>(l);
+mql->MediumFeaturesChanged(notifyList);
+}
+if (!notifyList.IsEmpty()) {
+nsPIDOMWindow *win = mDocument->GetInnerWindow();
+nsCOMPtr<EventTarget> et = do_QueryInterface(win);
+nsCxPusher pusher;
+for (uint32_t i = 0, i_end = notifyList.Length(); i != i_end; ++i) {
+if (pusher.RePush(et)) {
+nsAutoMicroTask mt;
+MediaQueryList::HandleChangeData &d = notifyList[i];
+ErrorResult result;
+d.callback->Call(*d.mql, result);
+}
+}
+}
+// NOTE:  When |notifyList| goes out of scope, our destructor could run.
+}
+}
+void
+nsPresContext::PostMediaFeatureValuesChangedEvent()
+{
+// FIXME: We should probably replace this event with use of
+// nsRefreshDriver::AddStyleFlushObserver (except the pres shell would
+// need to track whether it's been added).
+if (!mPendingMediaFeatureValuesChanged) {
+nsCOMPtr<nsIRunnable> ev =
+NS_NewRunnableMethod(this, &nsPresContext::HandleMediaFeatureValuesChangedEvent);
+if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+mPendingMediaFeatureValuesChanged = true;
+mDocument->SetNeedStyleFlush();
+}
+}
+}
+void
+nsPresContext::HandleMediaFeatureValuesChangedEvent()
+{
+// Null-check mShell in case the shell has been destroyed (and the
+// event is the only thing holding the pres context alive).
+if (mPendingMediaFeatureValuesChanged && mShell) {
+MediaFeatureValuesChanged(eRebuildStyleIfNeeded);
+}
+}
+already_AddRefed<MediaQueryList>
+nsPresContext::MatchMedia(const nsAString& aMediaQueryList)
+{
+nsRefPtr<MediaQueryList> result = new MediaQueryList(this, aMediaQueryList);
+// Insert the new item at the end of the linked list.
+PR_INSERT_BEFORE(result, &mDOMMediaQueryLists);
+return result.forget();
+}
+nsCompatibility
+nsPresContext::CompatibilityMode() const
+{
+return Document()->GetCompatibilityMode();
+}
+void
+nsPresContext::SetPaginatedScrolling(bool aPaginated)
+{
+if (mType == eContext_PrintPreview || mType == eContext_PageLayout)
+mCanPaginatedScroll = aPaginated;
+}
+void
+nsPresContext::SetPrintSettings(nsIPrintSettings *aPrintSettings)
+{
+if (mMedium == nsGkAtoms::print)
+mPrintSettings = aPrintSettings;
+}
+bool
+nsPresContext::EnsureVisible()
+{
+nsCOMPtr<nsIDocShell> docShell(mContainer);
+if (docShell) {
+nsCOMPtr<nsIContentViewer> cv;
+docShell->GetContentViewer(getter_AddRefs(cv));
+// Make sure this is the content viewer we belong with
+if (cv) {
+nsRefPtr<nsPresContext> currentPresContext;
+cv->GetPresContext(getter_AddRefs(currentPresContext));
+if (currentPresContext == this) {
+// OK, this is us.  We want to call Show() on the content viewer.
+nsresult result = cv->Show();
+if (NS_SUCCEEDED(result)) {
+return true;
+}
+}
+}
+}
+return false;
+}
+#ifdef MOZ_REFLOW_PERF
+void
+nsPresContext::CountReflows(const char * aName, nsIFrame * aFrame)
+{
+if (mShell) {
+mShell->CountReflows(aName, aFrame);
+}
+}
+#endif
+void
+nsPresContext::UpdateIsChrome()
+{
+mIsChrome = mContainer &&
+nsIDocShellTreeItem::typeChrome == mContainer->ItemType();
+}
+/* virtual */ bool
+nsPresContext::HasAuthorSpecifiedRules(nsIFrame *aFrame, uint32_t ruleTypeMask) const
+{
+return
+nsRuleNode::HasAuthorSpecifiedRules(aFrame->StyleContext(),
+ruleTypeMask,
+UseDocumentColors());
+}
+gfxUserFontSet*
+nsPresContext::GetUserFontSetInternal()
+{
+// We want to initialize the user font set lazily the first time the
+// user asks for it, rather than building it too early and forcing
+// rule cascade creation.  Thus we try to enforce the invariant that
+// we *never* build the user font set until the first call to
+// GetUserFontSet.  However, once it's been requested, we can't wait
+// for somebody to call GetUserFontSet in order to rebuild it (see
+// comments below in RebuildUserFontSet for why).
+#ifdef DEBUG
+bool userFontSetGottenBefore = mGetUserFontSetCalled;
+#endif
+// Set mGetUserFontSetCalled up front, so that FlushUserFontSet will actually
+// flush.
+mGetUserFontSetCalled = true;
+if (mUserFontSetDirty) {
+// If this assertion fails, and there have actually been changes to
+// @font-face rules, then we will call StyleChangeReflow in
+// FlushUserFontSet.  If we're in the middle of reflow,
+// that's a bad thing to do, and the caller was responsible for
+// flushing first.  If we're not (e.g., in frame construction), it's
+// ok.
+NS_ASSERTION(!userFontSetGottenBefore || !mShell->IsReflowLocked(),
+"FlushUserFontSet should have been called first");
+FlushUserFontSet();
+}
+return mUserFontSet;
+}
+gfxUserFontSet*
+nsPresContext::GetUserFontSetExternal()
+{
+return GetUserFontSetInternal();
+}
+void
+nsPresContext::FlushUserFontSet()
+{
+if (!mShell) {
+return; // we've been torn down
+}
+if (!mGetUserFontSetCalled) {
+return; // No one cares about this font set yet, but we want to be careful
+// to not unset our mUserFontSetDirty bit, so when someone really
+// does we'll create it.
+}
+if (mUserFontSetDirty) {
+if (gfxPlatform::GetPlatform()->DownloadableFontsEnabled()) {
+nsTArray<nsFontFaceRuleContainer> rules;
+if (!mShell->StyleSet()->AppendFontFaceRules(this, rules)) {
+if (mUserFontSet) {
+mUserFontSet->Destroy();
+NS_RELEASE(mUserFontSet);
+}
+return;
+}
+bool changed = false;
+if (rules.Length() == 0) {
+if (mUserFontSet) {
+mUserFontSet->Destroy();
+NS_RELEASE(mUserFontSet);
+changed = true;
+}
+} else {
+if (!mUserFontSet) {
+mUserFontSet = new nsUserFontSet(this);
+NS_ADDREF(mUserFontSet);
+}
+changed = mUserFontSet->UpdateRules(rules);
+}
+// We need to enqueue a style change reflow (for later) to
+// reflect that we're modifying @font-face rules.  (However,
+// without a reflow, nothing will happen to start any downloads
+// that are needed.)
+if (changed) {
+UserFontSetUpdated();
+}
+}
+mUserFontSetDirty = false;
+}
+}
+void
+nsPresContext::RebuildUserFontSet()
+{
+if (!mGetUserFontSetCalled) {
+// We want to lazily build the user font set the first time it's
+// requested (so we don't force creation of rule cascades too
+// early), so don't do anything now.
+return;
+}
+mUserFontSetDirty = true;
+mDocument->SetNeedStyleFlush();
+// Somebody has already asked for the user font set, so we need to
+// post an event to rebuild it.  Setting the user font set to be dirty
+// and lazily rebuilding it isn't sufficient, since it is only the act
+// of rebuilding it that will trigger the style change reflow that
+// calls GetUserFontSet.  (This reflow causes rebuilding of text runs,
+// which starts font loads, whose completion causes another style
+// change reflow).
+if (!mPostedFlushUserFontSet) {
+nsCOMPtr<nsIRunnable> ev =
+NS_NewRunnableMethod(this, &nsPresContext::HandleRebuildUserFontSet);
+if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+mPostedFlushUserFontSet = true;
+}
+}
+}
+void
+nsPresContext::UserFontSetUpdated()
+{
+if (!mShell)
+return;
+// Changes to the set of available fonts can cause updates to layout by:
+//
+//   1. Changing the font used for text, which changes anything that
+//      depends on text measurement, including line breaking and
+//      intrinsic widths, and any other parts of layout that depend on
+//      font metrics.  This requires a style change reflow to update.
+//
+//   2. Changing the value of the 'ex' and 'ch' units in style data,
+//      which also depend on font metrics.  Updating this information
+//      requires rebuilding the rule tree from the top, avoiding the
+//      reuse of cached data even when no style rules have changed.
+PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW);
+}
+void
+nsPresContext::EnsureSafeToHandOutCSSRules()
+{
+nsCSSStyleSheet::EnsureUniqueInnerResult res =
+mShell->StyleSet()->EnsureUniqueInnerOnCSSSheets();
+if (res == nsCSSStyleSheet::eUniqueInner_AlreadyUnique) {
+// Nothing to do.
+return;
+}
+MOZ_ASSERT(res == nsCSSStyleSheet::eUniqueInner_ClonedInner);
+RebuildAllStyleData(nsChangeHint(0));
+}
+void
+nsPresContext::FireDOMPaintEvent(nsInvalidateRequestList* aList)
+{
+nsPIDOMWindow* ourWindow = mDocument->GetWindow();
+if (!ourWindow)
+return;
+nsCOMPtr<EventTarget> dispatchTarget = do_QueryInterface(ourWindow);
+nsCOMPtr<EventTarget> eventTarget = dispatchTarget;
+if (!IsChrome() && !mSendAfterPaintToContent) {
+// Don't tell the window about this event, it should not know that
+// something happened in a subdocument. Tell only the chrome event handler.
+// (Events sent to the window get propagated to the chrome event handler
+// automatically.)
+dispatchTarget = do_QueryInterface(ourWindow->GetParentTarget());
+if (!dispatchTarget) {
+return;
+}
+}
+// Events sent to the window get propagated to the chrome event handler
+// automatically.
+nsCOMPtr<nsIDOMEvent> event;
+// This will empty our list in case dispatching the event causes more damage
+// (hopefully it won't, or we're likely to get an infinite loop! At least
+// it won't be blocking app execution though).
+NS_NewDOMNotifyPaintEvent(getter_AddRefs(event), eventTarget, this, nullptr,
+NS_AFTERPAINT, aList);
+if (!event) {
+return;
+}
+// Even if we're not telling the window about the event (so eventTarget is
+// the chrome event handler, not the window), the window is still
+// logically the event target.
+event->SetTarget(eventTarget);
+event->SetTrusted(true);
+EventDispatcher::DispatchDOMEvent(dispatchTarget, nullptr, event, this,
+nullptr);
+}
+static bool
+MayHavePaintEventListenerSubdocumentCallback(nsIDocument* aDocument, void* aData)
+{
+bool *result = static_cast<bool*>(aData);
+nsIPresShell* shell = aDocument->GetShell();
+if (shell) {
+nsPresContext* pc = shell->GetPresContext();
+if (pc) {
+*result = pc->MayHavePaintEventListenerInSubDocument();
+// If we found a paint event listener, then we can stop enumerating
+// sub documents.
+return !*result;
+}
+}
+return true;
+}
+static bool
+MayHavePaintEventListener(nsPIDOMWindow* aInnerWindow)
+{
+if (!aInnerWindow)
+return false;
+if (aInnerWindow->HasPaintEventListeners())
+return true;
+EventTarget* parentTarget = aInnerWindow->GetParentTarget();
+if (!parentTarget)
+return false;
+EventListenerManager* manager = nullptr;
+if ((manager = parentTarget->GetExistingListenerManager()) &&
+manager->MayHavePaintEventListener()) {
+return true;
+}
+nsCOMPtr<nsINode> node;
+if (parentTarget != aInnerWindow->GetChromeEventHandler()) {
+nsCOMPtr<nsIInProcessContentFrameMessageManager> mm =
+do_QueryInterface(parentTarget);
+if (mm) {
+node = mm->GetOwnerContent();
+}
+}
+if (!node) {
+node = do_QueryInterface(parentTarget);
+}
+if (node)
+return MayHavePaintEventListener(node->OwnerDoc()->GetInnerWindow());
+nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(parentTarget);
+if (window)
+return MayHavePaintEventListener(window);
+nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(parentTarget);
+EventTarget* tabChildGlobal;
+return root &&
+(tabChildGlobal = root->GetParentTarget()) &&
+(manager = tabChildGlobal->GetExistingListenerManager()) &&
+manager->MayHavePaintEventListener();
+}
+bool
+nsPresContext::MayHavePaintEventListener()
+{
+return ::MayHavePaintEventListener(mDocument->GetInnerWindow());
+}
+bool
+nsPresContext::MayHavePaintEventListenerInSubDocument()
+{
+if (MayHavePaintEventListener()) {
+return true;
+}
+bool result = false;
+mDocument->EnumerateSubDocuments(MayHavePaintEventListenerSubdocumentCallback, &result);
+return result;
+}
+void
+nsPresContext::NotifyInvalidation(uint32_t aFlags)
+{
+nsIFrame* rootFrame = PresShell()->FrameManager()->GetRootFrame();
+NotifyInvalidation(rootFrame->GetVisualOverflowRect(), aFlags);
+mAllInvalidated = true;
+}
+void
+nsPresContext::NotifyInvalidation(const nsIntRect& aRect, uint32_t aFlags)
+{
+nsRect rect(DevPixelsToAppUnits(aRect.x),
+DevPixelsToAppUnits(aRect.y),
+DevPixelsToAppUnits(aRect.width),
+DevPixelsToAppUnits(aRect.height));
+NotifyInvalidation(rect, aFlags);
+}
+void
+nsPresContext::NotifyInvalidation(const nsRect& aRect, uint32_t aFlags)
+{
+MOZ_ASSERT(GetContainerWeak(), "Invalidation in detached pres context");
+// If there is no paint event listener, then we don't need to fire
+// the asynchronous event. We don't even need to record invalidation.
+// MayHavePaintEventListener is pretty cheap and we could make it
+// even cheaper by providing a more efficient
+// nsPIDOMWindow::GetListenerManager.
+if (mAllInvalidated) {
+return;
+}
+nsPresContext* pc;
+for (pc = this; pc; pc = pc->GetParentPresContext()) {
+if (pc->mFireAfterPaintEvents)
+break;
+pc->mFireAfterPaintEvents = true;
+}
+if (!pc) {
+nsRootPresContext* rpc = GetRootPresContext();
+if (rpc) {
+rpc->EnsureEventualDidPaintEvent();
+}
+}
+nsInvalidateRequestList::Request* request =
+mInvalidateRequestsSinceLastPaint.mRequests.AppendElement();
+if (!request)
+return;
+request->mRect = aRect;
+request->mFlags = aFlags;
+}
+/* static */ void
+nsPresContext::NotifySubDocInvalidation(ContainerLayer* aContainer,
+const nsIntRegion& aRegion)
+{
+ContainerLayerPresContext *data =
+static_cast<ContainerLayerPresContext*>(
+aContainer->GetUserData(&gNotifySubDocInvalidationData));
+if (!data) {
+return;
+}
+nsIntPoint topLeft = aContainer->GetVisibleRegion().GetBounds().TopLeft();
+nsIntRegionRectIterator iter(aRegion);
+while (const nsIntRect* r = iter.Next()) {
+nsIntRect rect = *r;
+//PresContext coordinate space is relative to the start of our visible
+// region. Is this really true? This feels like the wrong way to get the right
+// answer.
+rect.MoveBy(-topLeft);
+data->mPresContext->NotifyInvalidation(rect, 0);
+}
+}
+void
+nsPresContext::SetNotifySubDocInvalidationData(ContainerLayer* aContainer)
+{
+ContainerLayerPresContext* pres = new ContainerLayerPresContext;
+pres->mPresContext = this;
+aContainer->SetUserData(&gNotifySubDocInvalidationData, pres);
+}
+/* static */ void
+nsPresContext::ClearNotifySubDocInvalidationData(ContainerLayer* aContainer)
+{
+aContainer->SetUserData(&gNotifySubDocInvalidationData, nullptr);
+}
+struct NotifyDidPaintSubdocumentCallbackClosure {
+uint32_t mFlags;
+bool mNeedsAnotherDidPaintNotification;
+};
+static bool
+NotifyDidPaintSubdocumentCallback(nsIDocument* aDocument, void* aData)
+{
+NotifyDidPaintSubdocumentCallbackClosure* closure =
+static_cast<NotifyDidPaintSubdocumentCallbackClosure*>(aData);
+nsIPresShell* shell = aDocument->GetShell();
+if (shell) {
+nsPresContext* pc = shell->GetPresContext();
+if (pc) {
+pc->NotifyDidPaintForSubtree(closure->mFlags);
+if (pc->IsDOMPaintEventPending()) {
+closure->mNeedsAnotherDidPaintNotification = true;
+}
+}
+}
+return true;
+}
+class DelayedFireDOMPaintEvent : public nsRunnable {
+public:
+DelayedFireDOMPaintEvent(nsPresContext* aPresContext,
+nsInvalidateRequestList* aList)
+: mPresContext(aPresContext)
+{
+MOZ_ASSERT(mPresContext->GetContainerWeak(),
+"DOMPaintEvent requested for a detached pres context");
+mList.TakeFrom(aList);
+}
+NS_IMETHOD Run() MOZ_OVERRIDE
+{
+// The pres context might have been detached during the delay -
+// that's fine, just don't fire the event.
+if (mPresContext->GetContainerWeak()) {
+mPresContext->FireDOMPaintEvent(&mList);
+}
+return NS_OK;
+}
+nsRefPtr<nsPresContext> mPresContext;
+nsInvalidateRequestList mList;
+};
+void
+nsPresContext::NotifyDidPaintForSubtree(uint32_t aFlags)
+{
+if (IsRoot()) {
+static_cast<nsRootPresContext*>(this)->CancelDidPaintTimer();
+if (!mFireAfterPaintEvents) {
+return;
+}
+}
+// Non-root prescontexts fire MozAfterPaint to all their descendants
+// unconditionally, even if no invalidations have been collected. This is
+// because we don't want to eat the cost of collecting invalidations for
+// every subdocument (which would require putting every subdocument in its
+// own layer).
+if (aFlags & nsIPresShell::PAINT_LAYERS) {
+mUndeliveredInvalidateRequestsBeforeLastPaint.TakeFrom(
+&mInvalidateRequestsSinceLastPaint);
+mAllInvalidated = false;
+}
+if (aFlags & nsIPresShell::PAINT_COMPOSITE) {
+nsCOMPtr<nsIRunnable> ev =
+new DelayedFireDOMPaintEvent(this, &mUndeliveredInvalidateRequestsBeforeLastPaint);
+nsContentUtils::AddScriptRunner(ev);
+}
+NotifyDidPaintSubdocumentCallbackClosure closure = { aFlags, false };
+mDocument->EnumerateSubDocuments(NotifyDidPaintSubdocumentCallback, &closure);
+if (!closure.mNeedsAnotherDidPaintNotification &&
+mInvalidateRequestsSinceLastPaint.IsEmpty() &&
+mUndeliveredInvalidateRequestsBeforeLastPaint.IsEmpty()) {
+// Nothing more to do for the moment.
+mFireAfterPaintEvents = false;
+} else {
+if (IsRoot()) {
+static_cast<nsRootPresContext*>(this)->EnsureEventualDidPaintEvent();
+}
+}
+}
+bool
+nsPresContext::HasCachedStyleData()
+{
+return mShell && mShell->StyleSet()->HasCachedStyleData();
+}
+static bool sGotInterruptEnv = false;
+enum InterruptMode {
+ModeRandom,
+ModeCounter,
+ModeEvent
+};
+// Controlled by the GECKO_REFLOW_INTERRUPT_MODE env var; allowed values are
+// "random" (except on Windows) or "counter".  If neither is used, the mode is
+// ModeEvent.
+static InterruptMode sInterruptMode = ModeEvent;
+#ifndef XP_WIN
+// Used for the "random" mode.  Controlled by the GECKO_REFLOW_INTERRUPT_SEED
+// env var.
+static uint32_t sInterruptSeed = 1;
+#endif
+// Used for the "counter" mode.  This is the number of unskipped interrupt
+// checks that have to happen before we interrupt.  Controlled by the
+// GECKO_REFLOW_INTERRUPT_FREQUENCY env var.
+static uint32_t sInterruptMaxCounter = 10;
+// Used for the "counter" mode.  This counts up to sInterruptMaxCounter and is
+// then reset to 0.
+static uint32_t sInterruptCounter;
+// Number of interrupt checks to skip before really trying to interrupt.
+// Controlled by the GECKO_REFLOW_INTERRUPT_CHECKS_TO_SKIP env var.
+static uint32_t sInterruptChecksToSkip = 200;
+// Number of milliseconds that a reflow should be allowed to run for before we
+// actually allow interruption.  Controlled by the
+// GECKO_REFLOW_MIN_NOINTERRUPT_DURATION env var.  Can't be initialized here,
+// because TimeDuration/TimeStamp is not safe to use in static constructors..
+static TimeDuration sInterruptTimeout;
+static void GetInterruptEnv()
+{
+char *ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_MODE");
+if (ev) {
+#ifndef XP_WIN
+if (PL_strcasecmp(ev, "random") == 0) {
+ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_SEED");
+if (ev) {
+sInterruptSeed = atoi(ev);
+}
+srandom(sInterruptSeed);
+sInterruptMode = ModeRandom;
+} else
+#endif
+if (PL_strcasecmp(ev, "counter") == 0) {
+ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_FREQUENCY");
+if (ev) {
+sInterruptMaxCounter = atoi(ev);
+}
+sInterruptCounter = 0;
+sInterruptMode = ModeCounter;
+}
+}
+ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_CHECKS_TO_SKIP");
+if (ev) {
+sInterruptChecksToSkip = atoi(ev);
+}
+ev = PR_GetEnv("GECKO_REFLOW_MIN_NOINTERRUPT_DURATION");
+int duration_ms = ev ? atoi(ev) : 100;
+sInterruptTimeout = TimeDuration::FromMilliseconds(duration_ms);
+}
+bool
+nsPresContext::HavePendingInputEvent()
+{
+switch (sInterruptMode) {
+#ifndef XP_WIN
+case ModeRandom:
+return (random() & 1);
+#endif
+case ModeCounter:
+if (sInterruptCounter < sInterruptMaxCounter) {
+++sInterruptCounter;
+return false;
+}
+sInterruptCounter = 0;
+return true;
+default:
+case ModeEvent: {
+nsIFrame* f = PresShell()->GetRootFrame();
+if (f) {
+nsIWidget* w = f->GetNearestWidget();
+if (w) {
+return w->HasPendingInputEvent();
+}
+}
+return false;
+}
+}
+}
+void
+nsPresContext::ReflowStarted(bool aInterruptible)
+{
+#ifdef NOISY_INTERRUPTIBLE_REFLOW
+if (!aInterruptible) {
+printf("STARTING NONINTERRUPTIBLE REFLOW\n");
+}
+#endif
+// We don't support interrupting in paginated contexts, since page
+// sequences only handle initial reflow
+mInterruptsEnabled = aInterruptible && !IsPaginated() &&
+nsLayoutUtils::InterruptibleReflowEnabled();
+// Don't set mHasPendingInterrupt based on HavePendingInputEvent() here.  If
+// we ever change that, then we need to update the code in
+// PresShell::DoReflow to only add the just-reflown root to dirty roots if
+// it's actually dirty.  Otherwise we can end up adding a root that has no
+// interruptible descendants, just because we detected an interrupt at reflow
+// start.
+mHasPendingInterrupt = false;
+mInterruptChecksToSkip = sInterruptChecksToSkip;
+if (mInterruptsEnabled) {
+mReflowStartTime = TimeStamp::Now();
+}
+}
+bool
+nsPresContext::CheckForInterrupt(nsIFrame* aFrame)
+{
+if (mHasPendingInterrupt) {
+mShell->FrameNeedsToContinueReflow(aFrame);
+return true;
+}
+if (!sGotInterruptEnv) {
+sGotInterruptEnv = true;
+GetInterruptEnv();
+}
+if (!mInterruptsEnabled) {
+return false;
+}
+if (mInterruptChecksToSkip > 0) {
+--mInterruptChecksToSkip;
+return false;
+}
+mInterruptChecksToSkip = sInterruptChecksToSkip;
+// Don't interrupt if it's been less than sInterruptTimeout since we started
+// the reflow.
+mHasPendingInterrupt =
+TimeStamp::Now() - mReflowStartTime > sInterruptTimeout &&
+HavePendingInputEvent() &&
+!IsChrome();
+if (mHasPendingInterrupt) {
+#ifdef NOISY_INTERRUPTIBLE_REFLOW
+printf("*** DETECTED pending interrupt (time=%lld)\n", PR_Now());
+#endif /* NOISY_INTERRUPTIBLE_REFLOW */
+mShell->FrameNeedsToContinueReflow(aFrame);
+}
+return mHasPendingInterrupt;
+}
+nsIFrame*
+nsPresContext::GetPrimaryFrameFor(nsIContent* aContent)
+{
+NS_PRECONDITION(aContent, "Don't do that");
+if (GetPresShell() &&
+GetPresShell()->GetDocument() == aContent->GetCurrentDoc()) {
+return aContent->GetPrimaryFrame();
+}
+return nullptr;
+}
+size_t
+nsPresContext::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
+{
+return mPropertyTable.SizeOfExcludingThis(aMallocSizeOf);
+mLangGroupFontPrefs.SizeOfExcludingThis(aMallocSizeOf);
+// Measurement of other members may be added later if DMD finds it is
+// worthwhile.
+}
+bool
+nsPresContext::IsRootContentDocument()
+{
+// We are a root content document if: we are not a resource doc, we are
+// not chrome, and we either have no parent or our parent is chrome.
+if (mDocument->IsResourceDoc()) {
+return false;
+}
+if (IsChrome()) {
+return false;
+}
+// We may not have a root frame, so use views.
+nsView* view = PresShell()->GetViewManager()->GetRootView();
+if (!view) {
+return false;
+}
+view = view->GetParent(); // anonymous inner view
+if (!view) {
+return true;
+}
+view = view->GetParent(); // subdocumentframe's view
+if (!view) {
+return true;
+}
+nsIFrame* f = view->GetFrame();
+return (f && f->PresContext()->IsChrome());
+}
+bool
+nsPresContext::IsCrossProcessRootContentDocument()
+{
+if (!IsRootContentDocument()) {
+return false;
+}
+if (XRE_GetProcessType() == GeckoProcessType_Default) {
+return true;
+}
+TabChild* tabChild = TabChild::GetFrom(mShell);
+return (tabChild && tabChild->IsRootContentDocument());
+}
+bool nsPresContext::GetPaintFlashing() const
+{
+if (!mPaintFlashingInitialized) {
+bool pref = Preferences::GetBool("nglayout.debug.paint_flashing");
+if (!pref && IsChrome()) {
+pref = Preferences::GetBool("nglayout.debug.paint_flashing_chrome");
+}
+mPaintFlashing = pref;
+mPaintFlashingInitialized = true;
+}
+return mPaintFlashing;
+}
+int32_t
+nsPresContext::AppUnitsPerDevPixel() const
+{
+return mDeviceContext->AppUnitsPerDevPixel();
+}
+nscoord
+nsPresContext::GfxUnitsToAppUnits(gfxFloat aGfxUnits) const
+{
+return mDeviceContext->GfxUnitsToAppUnits(aGfxUnits);
+}
+gfxFloat
+nsPresContext::AppUnitsToGfxUnits(nscoord aAppUnits) const
+{
+return mDeviceContext->AppUnitsToGfxUnits(aAppUnits);
+}
+bool
+nsPresContext::IsDeviceSizePageSize()
+{
+bool isDeviceSizePageSize = false;
+nsCOMPtr<nsIDocShell> docShell(mContainer);
+if (docShell) {
+isDeviceSizePageSize = docShell->GetDeviceSizeIsPageSize();
+}
+return isDeviceSizePageSize;
+}
+nsRootPresContext::nsRootPresContext(nsIDocument* aDocument,
+nsPresContextType aType)
+: nsPresContext(aDocument, aType),
+mDOMGeneration(0)
+{
+}
+nsRootPresContext::~nsRootPresContext()
+{
+NS_ASSERTION(mRegisteredPlugins.Count() == 0,
+"All plugins should have been unregistered");
+CancelDidPaintTimer();
+CancelApplyPluginGeometryTimer();
+}
+/* virtual */ void
+nsRootPresContext::Detach()
+{
+CancelDidPaintTimer();
+// XXXmats maybe also CancelApplyPluginGeometryTimer(); ?
+nsPresContext::Detach();
+}
+void
+nsRootPresContext::RegisterPluginForGeometryUpdates(nsIContent* aPlugin)
+{
+mRegisteredPlugins.PutEntry(aPlugin);
+}
+void
+nsRootPresContext::UnregisterPluginForGeometryUpdates(nsIContent* aPlugin)
+{
+mRegisteredPlugins.RemoveEntry(aPlugin);
+}
+static PLDHashOperator
+SetPluginHidden(nsRefPtrHashKey<nsIContent>* aEntry, void* userArg)
+{
+nsIFrame* root = static_cast<nsIFrame*>(userArg);
+nsObjectFrame* f = static_cast<nsObjectFrame*>(aEntry->GetKey()->GetPrimaryFrame());
+if (!f) {
+NS_WARNING("Null frame in SetPluginHidden");
+return PL_DHASH_NEXT;
+}
+if (!nsLayoutUtils::IsAncestorFrameCrossDoc(root, f)) {
+// f is not managed by this frame so we should ignore it.
+return PL_DHASH_NEXT;
+}
+f->SetEmptyWidgetConfiguration();
+return PL_DHASH_NEXT;
+}
+void
+nsRootPresContext::ComputePluginGeometryUpdates(nsIFrame* aFrame,
+nsDisplayListBuilder* aBuilder,
+nsDisplayList* aList)
+{
+if (mRegisteredPlugins.Count() == 0) {
+return;
+}
+// Initially make the next state for each plugin descendant of aFrame be
+// "hidden". Plugins that are visible will have their next state set to
+// unhidden by nsDisplayPlugin::ComputeVisibility.
+mRegisteredPlugins.EnumerateEntries(SetPluginHidden, aFrame);
+nsIFrame* rootFrame = FrameManager()->GetRootFrame();
+if (rootFrame && aBuilder->ContainsPluginItem()) {
+aBuilder->SetForPluginGeometry();
+aBuilder->SetAccurateVisibleRegions();
+// Merging and flattening has already been done and we should not do it
+// again. nsDisplayScroll(Info)Layer doesn't support trying to flatten
+// again.
+aBuilder->SetAllowMergingAndFlattening(false);
+nsRegion region = rootFrame->GetVisualOverflowRectRelativeToSelf();
+// nsDisplayPlugin::ComputeVisibility will automatically set a non-hidden
+// widget configuration for the plugin, if it's visible.
+aList->ComputeVisibilityForRoot(aBuilder, &region);
+}
+#ifdef XP_MACOSX
+// We control painting of Mac plugins, so just apply geometry updates now.
+// This is not happening during a paint event.
+ApplyPluginGeometryUpdates();
+#else
+InitApplyPluginGeometryTimer();
+#endif
+}
+static void
+ApplyPluginGeometryUpdatesCallback(nsITimer *aTimer, void *aClosure)
+{
+static_cast<nsRootPresContext*>(aClosure)->ApplyPluginGeometryUpdates();
+}
+void
+nsRootPresContext::InitApplyPluginGeometryTimer()
+{
+if (mApplyPluginGeometryTimer) {
+return;
+}
+// We'll apply the plugin geometry updates during the next compositing paint in this
+// presContext (either from nsPresShell::WillPaintWindow or from
+// nsPresShell::DidPaintWindow, depending on the platform).  But paints might
+// get optimized away if the old plugin geometry covers the invalid region,
+// so set a backup timer to do this too.  We want to make sure this
+// won't fire before our normal paint notifications, if those would
+// update the geometry, so set it for double the refresh driver interval.
+mApplyPluginGeometryTimer = do_CreateInstance("@mozilla.org/timer;1");
+if (mApplyPluginGeometryTimer) {
+mApplyPluginGeometryTimer->
+InitWithFuncCallback(ApplyPluginGeometryUpdatesCallback, this,
+nsRefreshDriver::DefaultInterval() * 2,
+nsITimer::TYPE_ONE_SHOT);
+}
+}
+void
+nsRootPresContext::CancelApplyPluginGeometryTimer()
+{
+if (mApplyPluginGeometryTimer) {
+mApplyPluginGeometryTimer->Cancel();
+mApplyPluginGeometryTimer = nullptr;
+}
+}
+static bool
+HasOverlap(const nsIntPoint& aOffset1, const nsTArray<nsIntRect>& aClipRects1,
+const nsIntPoint& aOffset2, const nsTArray<nsIntRect>& aClipRects2)
+{
+nsIntPoint offsetDelta = aOffset1 - aOffset2;
+for (uint32_t i = 0; i < aClipRects1.Length(); ++i) {
+for (uint32_t j = 0; j < aClipRects2.Length(); ++j) {
+if ((aClipRects1[i] + offsetDelta).Intersects(aClipRects2[j]))
+return true;
+}
+}
+return false;
+}
+/**
+* Given a list of plugin windows to move to new locations, sort the list
+* so that for each window move, the window moves to a location that
+* does not intersect other windows. This minimizes flicker and repainting.
+* It's not always possible to do this perfectly, since in general
+* we might have cycles. But we do our best.
+* We need to take into account that windows are clipped to particular
+* regions and the clip regions change as the windows are moved.
+*/
+static void
+SortConfigurations(nsTArray<nsIWidget::Configuration>* aConfigurations)
+{
+if (aConfigurations->Length() > 10) {
+// Give up, we don't want to get bogged down here
+return;
+}
+nsTArray<nsIWidget::Configuration> pluginsToMove;
+pluginsToMove.SwapElements(*aConfigurations);
+// Our algorithm is quite naive. At each step we try to identify
+// a window that can be moved to its new location that won't overlap
+// any other windows at the new location. If there is no such
+// window, we just move the last window in the list anyway.
+while (!pluginsToMove.IsEmpty()) {
+// Find a window whose destination does not overlap any other window
+uint32_t i;
+for (i = 0; i + 1 < pluginsToMove.Length(); ++i) {
+nsIWidget::Configuration* config = &pluginsToMove[i];
+bool foundOverlap = false;
+for (uint32_t j = 0; j < pluginsToMove.Length(); ++j) {
+if (i == j)
+continue;
+nsIntRect bounds;
+pluginsToMove[j].mChild->GetBounds(bounds);
+nsAutoTArray<nsIntRect,1> clipRects;
+pluginsToMove[j].mChild->GetWindowClipRegion(&clipRects);
+if (HasOverlap(bounds.TopLeft(), clipRects,
+config->mBounds.TopLeft(),
+config->mClipRegion)) {
+foundOverlap = true;
+break;
+}
+}
+if (!foundOverlap)
+break;
+}
+// Note that we always move the last plugin in pluginsToMove, if we
+// can't find any other plugin to move
+aConfigurations->AppendElement(pluginsToMove[i]);
+pluginsToMove.RemoveElementAt(i);
+}
+}
+static PLDHashOperator
+PluginDidSetGeometryEnumerator(nsRefPtrHashKey<nsIContent>* aEntry, void* userArg)
+{
+nsObjectFrame* f = static_cast<nsObjectFrame*>(aEntry->GetKey()->GetPrimaryFrame());
+if (!f) {
+NS_WARNING("Null frame in PluginDidSetGeometryEnumerator");
+return PL_DHASH_NEXT;
+}
+f->DidSetWidgetGeometry();
+return PL_DHASH_NEXT;
+}
+struct PluginGetGeometryUpdateClosure {
+nsTArray<nsIWidget::Configuration> mConfigurations;
+};
+static PLDHashOperator
+PluginGetGeometryUpdate(nsRefPtrHashKey<nsIContent>* aEntry, void* userArg)
+{
+PluginGetGeometryUpdateClosure* closure =
+static_cast<PluginGetGeometryUpdateClosure*>(userArg);
+nsObjectFrame* f = static_cast<nsObjectFrame*>(aEntry->GetKey()->GetPrimaryFrame());
+if (!f) {
+NS_WARNING("Null frame in GetPluginGeometryUpdate");
+return PL_DHASH_NEXT;
+}
+f->GetWidgetConfiguration(&closure->mConfigurations);
+return PL_DHASH_NEXT;
+}
+void
+nsRootPresContext::ApplyPluginGeometryUpdates()
+{
+CancelApplyPluginGeometryTimer();
+PluginGetGeometryUpdateClosure closure;
+mRegisteredPlugins.EnumerateEntries(PluginGetGeometryUpdate, &closure);
+// Walk mRegisteredPlugins and ask each plugin for its configuration
+if (!closure.mConfigurations.IsEmpty()) {
+nsIWidget* widget = closure.mConfigurations[0].mChild->GetParent();
+NS_ASSERTION(widget, "Plugins must have a parent window");
+SortConfigurations(&closure.mConfigurations);
+widget->ConfigureChildren(closure.mConfigurations);
+}
+mRegisteredPlugins.EnumerateEntries(PluginDidSetGeometryEnumerator, nullptr);
+}
+static void
+NotifyDidPaintForSubtreeCallback(nsITimer *aTimer, void *aClosure)
+{
+nsPresContext* presContext = (nsPresContext*)aClosure;
+nsAutoScriptBlocker blockScripts;
+// This is a fallback if we don't get paint events for some reason
+// so we'll just pretend both layer painting and compositing happened.
+presContext->NotifyDidPaintForSubtree(
+nsIPresShell::PAINT_LAYERS | nsIPresShell::PAINT_COMPOSITE);
+}
+void
+nsRootPresContext::EnsureEventualDidPaintEvent()
+{
+if (mNotifyDidPaintTimer)
+return;
+mNotifyDidPaintTimer = do_CreateInstance("@mozilla.org/timer;1");
+if (!mNotifyDidPaintTimer)
+return;
+mNotifyDidPaintTimer->InitWithFuncCallback(NotifyDidPaintForSubtreeCallback,
+(void*)this, 100, nsITimer::TYPE_ONE_SHOT);
+}
+void
+nsRootPresContext::AddWillPaintObserver(nsIRunnable* aRunnable)
+{
+if (!mWillPaintFallbackEvent.IsPending()) {
+mWillPaintFallbackEvent = new RunWillPaintObservers(this);
+NS_DispatchToMainThread(mWillPaintFallbackEvent.get());
+}
+mWillPaintObservers.AppendElement(aRunnable);
+}
+/**
+* Run all runnables that need to get called before the next paint.
+*/
+void
+nsRootPresContext::FlushWillPaintObservers()
+{
+mWillPaintFallbackEvent = nullptr;
+nsTArray<nsCOMPtr<nsIRunnable> > observers;
+observers.SwapElements(mWillPaintObservers);
+for (uint32_t i = 0; i < observers.Length(); ++i) {
+observers[i]->Run();
+}
+}
+size_t
+nsRootPresContext::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
+{
+return nsPresContext::SizeOfExcludingThis(aMallocSizeOf);
+// Measurement of the following members may be added later if DMD finds it is
+// worthwhile:
+// - mNotifyDidPaintTimer
+// - mRegisteredPlugins
+// - mWillPaintObservers
+// - mWillPaintFallbackEvent
+}

The Tor Browser / file comparison

comparison: layout/base/nsPresContext.cpp

layout/base/nsPresContext.cpp