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-rw-r--r--layout/base/nsPresContext.cpp2961
1 files changed, 2961 insertions, 0 deletions
diff --git a/layout/base/nsPresContext.cpp b/layout/base/nsPresContext.cpp
new file mode 100644
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+++ b/layout/base/nsPresContext.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/. */
+
+/* a presentation of a document, part 1 */
+
+#include "nsPresContext.h"
+#include "nsPresContextInlines.h"
+
+#include "mozilla/ArrayUtils.h"
+#if defined(MOZ_WIDGET_ANDROID)
+# include "mozilla/AsyncEventDispatcher.h"
+#endif
+#include "mozilla/CycleCollectedJSContext.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/Encoding.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/PresShell.h"
+#include "mozilla/PresShellInlines.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/WindowGlobalChild.h"
+
+#include "base/basictypes.h"
+
+#include "nsCOMPtr.h"
+#include "nsCSSFrameConstructor.h"
+#include "nsDocShell.h"
+#include "nsIContentViewer.h"
+#include "nsPIDOMWindow.h"
+#include "mozilla/ServoStyleSet.h"
+#include "mozilla/MediaFeatureChange.h"
+#include "nsIContent.h"
+#include "nsIFrame.h"
+#include "mozilla/dom/BrowsingContext.h"
+#include "mozilla/dom/Document.h"
+#include "mozilla/dom/DocumentInlines.h"
+#include "nsIPrintSettings.h"
+#include "nsLanguageAtomService.h"
+#include "mozilla/LookAndFeel.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsHTMLDocument.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsThreadUtils.h"
+#include "nsLayoutUtils.h"
+#include "nsViewManager.h"
+#include "mozilla/RestyleManager.h"
+#include "SurfaceCacheUtils.h"
+#include "nsMediaFeatures.h"
+#include "gfxPlatform.h"
+#include "nsFontFaceLoader.h"
+#include "mozilla/AnimationEventDispatcher.h"
+#include "mozilla/EffectCompositor.h"
+#include "mozilla/EventListenerManager.h"
+#include "prenv.h"
+#include "nsPluginFrame.h"
+#include "nsTransitionManager.h"
+#include "nsAnimationManager.h"
+#include "CounterStyleManager.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/dom/Element.h"
+#include "nsIMessageManager.h"
+#include "mozilla/dom/HTMLBodyElement.h"
+#include "mozilla/dom/MediaQueryList.h"
+#include "mozilla/SMILAnimationController.h"
+#include "mozilla/css/ImageLoader.h"
+#include "mozilla/dom/PBrowserParent.h"
+#include "mozilla/dom/BrowserChild.h"
+#include "mozilla/dom/BrowserParent.h"
+#include "mozilla/StaticPresData.h"
+#include "nsRefreshDriver.h"
+#include "Layers.h"
+#include "LayerUserData.h"
+#include "ClientLayerManager.h"
+#include "mozilla/dom/NotifyPaintEvent.h"
+
+#include "nsFrameLoader.h"
+#include "nsContentUtils.h"
+#include "nsPIWindowRoot.h"
+#include "mozilla/Preferences.h"
+#include "gfxTextRun.h"
+#include "nsFontFaceUtils.h"
+#include "mozilla/GlobalStyleSheetCache.h"
+#include "mozilla/ServoBindings.h"
+#include "mozilla/StaticPrefs_layout.h"
+#include "mozilla/StaticPrefs_zoom.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/StyleSheetInlines.h"
+#include "mozilla/Telemetry.h"
+#include "mozilla/dom/Performance.h"
+#include "mozilla/dom/PerformanceTiming.h"
+#include "mozilla/dom/PerformancePaintTiming.h"
+#include "mozilla/layers/APZThreadUtils.h"
+#include "MobileViewportManager.h"
+#include "mozilla/dom/ImageTracker.h"
+
+// Needed for Start/Stop of Image Animation
+#include "imgIContainer.h"
+#include "nsIImageLoadingContent.h"
+
+#include "nsBidiUtils.h"
+#include "nsServiceManagerUtils.h"
+#include "nsBidi.h"
+
+#include "mozilla/dom/URL.h"
+#include "mozilla/ServoCSSParser.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::gfx;
+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;
+};
+
+bool nsPresContext::IsDOMPaintEventPending() {
+ if (!mTransactions.IsEmpty()) {
+ return true;
+ }
+
+ nsRootPresContext* drpc = GetRootPresContext();
+ if (drpc && drpc->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(drpc->mRefreshDriver->LastTransactionId().Next(),
+ nsRect(0, 0, 0, 0));
+ return true;
+ }
+ return false;
+}
+
+void nsPresContext::ForceReflowForFontInfoUpdate() {
+ // Flush the device context's font cache, so that we won't risk getting
+ // stale nsFontMetrics objects from it.
+ DeviceContext()->FlushFontCache();
+
+ // If there's a user font set, discard any src:local() faces it may have
+ // loaded because their font entries may no longer be valid.
+ if (Document()->GetFonts()) {
+ Document()->GetFonts()->GetUserFontSet()->ForgetLocalFaces();
+ }
+
+ // We can trigger reflow by pretending a font.* preference has changed;
+ // this is the same mechanism as gfxPlatform::ForceGlobalReflow() uses
+ // if new fonts are installed during the session, for example.
+ PreferenceChanged("font.internaluseonly.changed");
+}
+
+static bool IsVisualCharset(NotNull<const Encoding*> aCharset) {
+ return aCharset == ISO_8859_8_ENCODING;
+}
+
+nsPresContext::nsPresContext(dom::Document* aDocument, nsPresContextType aType)
+ : mPresShell(nullptr),
+ mDocument(aDocument),
+ mMedium(aType == eContext_Galley ? nsGkAtoms::screen : nsGkAtoms::print),
+ mSystemFontScale(1.0),
+ mTextZoom(1.0),
+ mEffectiveTextZoom(1.0),
+ mFullZoom(1.0),
+ mLastFontInflationScreenSize(gfxSize(-1.0, -1.0)),
+ mCurAppUnitsPerDevPixel(0),
+ mAutoQualityMinFontSizePixelsPref(0),
+ mDynamicToolbarMaxHeight(0),
+ mDynamicToolbarHeight(0),
+ mPageSize(-1, -1),
+ mPageScale(0.0),
+ mPPScale(1.0f),
+ mViewportScrollOverrideElement(nullptr),
+ mElementsRestyled(0),
+ mFramesConstructed(0),
+ mFramesReflowed(0),
+ mChangeHintForPrefChange(nsChangeHint(0)),
+ mInterruptChecksToSkip(0),
+ mNextFrameRateMultiplier(0),
+ mViewportScrollStyles(StyleOverflow::Auto, StyleOverflow::Auto),
+ // mImageAnimationMode is initialised below, in constructor body
+ mImageAnimationModePref(imgIContainer::kNormalAnimMode),
+ mType(aType),
+ mInflationDisabledForShrinkWrap(false),
+ mInteractionTimeEnabled(true),
+ mHasPendingInterrupt(false),
+ mHasEverBuiltInvisibleText(false),
+ mPendingInterruptFromTest(false),
+ mInterruptsEnabled(false),
+ mSendAfterPaintToContent(false),
+ mDrawImageBackground(true), // always draw the background
+ mDrawColorBackground(true),
+ // mNeverAnimate is initialised below, in constructor body
+ mPaginated(aType != eContext_Galley),
+ mCanPaginatedScroll(false),
+ mDoScaledTwips(true),
+ mIsRootPaginatedDocument(false),
+ mPrefBidiDirection(false),
+ mPrefScrollbarSide(0),
+ mPendingThemeChanged(false),
+ mPendingThemeChangeKind(0),
+ mPendingUIResolutionChanged(false),
+ mPostedPrefChangedRunnable(false),
+ mIsGlyph(false),
+ mUsesExChUnits(false),
+ mCounterStylesDirty(true),
+ mFontFeatureValuesDirty(true),
+ mSuppressResizeReflow(false),
+ mIsVisual(false),
+ mPaintFlashing(false),
+ mPaintFlashingInitialized(false),
+ mHasWarnedAboutPositionedTableParts(false),
+ mHasWarnedAboutTooLargeDashedOrDottedRadius(false),
+ mQuirkSheetAdded(false),
+ mHadNonBlankPaint(false),
+ mHadContentfulPaint(false),
+ mHadContentfulPaintComposite(false)
+#ifdef DEBUG
+ ,
+ mInitialized(false)
+#endif
+{
+#ifdef DEBUG
+ PodZero(&mLayoutPhaseCount);
+#endif
+
+ if (!IsDynamic()) {
+ mImageAnimationMode = imgIContainer::kDontAnimMode;
+ mNeverAnimate = true;
+ } else {
+ mImageAnimationMode = imgIContainer::kNormalAnimMode;
+ mNeverAnimate = false;
+ }
+ NS_ASSERTION(mDocument, "Null document");
+
+ // if text perf logging enabled, init stats struct
+ if (MOZ_LOG_TEST(gfxPlatform::GetLog(eGfxLog_textperf), LogLevel::Warning)) {
+ mTextPerf = MakeUnique<gfxTextPerfMetrics>();
+ }
+
+ if (Preferences::GetBool(GFX_MISSING_FONTS_NOTIFY_PREF)) {
+ mMissingFonts = MakeUnique<gfxMissingFontRecorder>();
+ }
+
+ // TODO: check whether this is too expensive to do for all pages;
+ // maybe we could throttle and only collect stats on 1% of page-loads,
+ // or something like that.
+ mFontStats = MakeUnique<FontMatchingStats>();
+
+ if (StaticPrefs::layout_dynamic_toolbar_max_height() > 0) {
+ // The pref for dynamic toolbar max height is only used in reftests so it's
+ // fine to set here.
+ mDynamicToolbarMaxHeight = StaticPrefs::layout_dynamic_toolbar_max_height();
+ }
+}
+
+static const char* gExactCallbackPrefs[] = {
+ "browser.underline_anchors",
+ "browser.anchor_color",
+ "browser.active_color",
+ "browser.visited_color",
+ "image.animation_mode",
+ "dom.send_after_paint_to_content",
+ "layout.css.dpi",
+ "layout.css.devPixelsPerPx",
+ "nglayout.debug.paint_flashing",
+ "nglayout.debug.paint_flashing_chrome",
+ "intl.accept_languages",
+ "dom.meta-viewport.enabled",
+ nullptr,
+};
+
+static const char* gPrefixCallbackPrefs[] = {
+ "font.", "browser.display.", "browser.viewport.",
+ "bidi.", "gfx.font_rendering.", nullptr,
+};
+
+void nsPresContext::Destroy() {
+ if (mEventManager) {
+ // unclear if these are needed, but can't hurt
+ mEventManager->NotifyDestroyPresContext(this);
+ mEventManager->SetPresContext(nullptr);
+ mEventManager = nullptr;
+ }
+
+ // Unregister preference callbacks
+ Preferences::UnregisterPrefixCallbacks(nsPresContext::PreferenceChanged,
+ gPrefixCallbackPrefs, this);
+ Preferences::UnregisterCallbacks(nsPresContext::PreferenceChanged,
+ gExactCallbackPrefs, this);
+
+ mRefreshDriver = nullptr;
+ MOZ_ASSERT(mOneShotPostRefreshObservers.IsEmpty());
+}
+
+nsPresContext::~nsPresContext() {
+ MOZ_ASSERT(!mPresShell, "Presshell forgot to clear our mPresShell pointer");
+ DetachPresShell();
+
+ Destroy();
+}
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPresContext)
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPresContext)
+NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(nsPresContext, LastRelease())
+
+void nsPresContext::LastRelease() {
+ if (mMissingFonts) {
+ mMissingFonts->Clear();
+ }
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsPresContext)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsPresContext)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAnimationEventDispatcher);
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDocument);
+ // NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mDeviceContext); // not xpcom
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEffectCompositor);
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mEventManager);
+ // NS_IMPL_CYCLE_COLLECTION_TRAVERSE_RAWPTR(mLanguage); // an atom
+
+ // NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mTheme); // a service
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrintSettings);
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsPresContext)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mAnimationEventDispatcher);
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mDocument);
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mDeviceContext); // worth bothering?
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mEffectCompositor);
+ // NS_RELEASE(tmp->mLanguage); // an atom
+ // NS_IMPL_CYCLE_COLLECTION_UNLINK(mTheme); // a service
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mPrintSettings);
+ NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_PTR
+
+ tmp->Destroy();
+NS_IMPL_CYCLE_COLLECTION_UNLINK_END
+
+// 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;
+
+bool nsPresContext::IsChrome() const {
+ return Document()->IsInChromeDocShell();
+}
+
+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");
+
+ PreferenceSheet::EnsureInitialized();
+
+ mSendAfterPaintToContent = Preferences::GetBool(
+ "dom.send_after_paint_to_content", mSendAfterPaintToContent);
+
+ mPrefScrollbarSide = Preferences::GetInt("layout.scrollbar.side");
+
+ Document()->SetMayNeedFontPrefsUpdate();
+
+ // * image animation
+ nsAutoCString animatePref;
+ Preferences::GetCString("image.animation_mode", animatePref);
+ if (animatePref.EqualsLiteral("normal"))
+ mImageAnimationModePref = imgIContainer::kNormalAnimMode;
+ else if (animatePref.EqualsLiteral("none"))
+ mImageAnimationModePref = imgIContainer::kDontAnimMode;
+ else if (animatePref.EqualsLiteral("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);
+
+ // 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);
+}
+
+void nsPresContext::InvalidatePaintedLayers() {
+ if (!mPresShell) {
+ return;
+ }
+ if (nsIFrame* rootFrame = mPresShell->GetRootFrame()) {
+ // FrameLayerBuilder caches invalidation-related values that depend on the
+ // appunits-per-dev-pixel ratio, so ensure that all PaintedLayer drawing
+ // is completely flushed.
+ rootFrame->InvalidateFrameSubtree();
+ }
+}
+
+void nsPresContext::AppUnitsPerDevPixelChanged() {
+ int32_t oldAppUnitsPerDevPixel = mCurAppUnitsPerDevPixel;
+
+ InvalidatePaintedLayers();
+
+ if (mDeviceContext) {
+ mDeviceContext->FlushFontCache();
+ }
+
+ MediaFeatureValuesChanged(
+ {RestyleHint::RecascadeSubtree(), NS_STYLE_HINT_REFLOW,
+ MediaFeatureChangeReason::ResolutionChange},
+ MediaFeatureChangePropagation::JustThisDocument);
+
+ mCurAppUnitsPerDevPixel = mDeviceContext->AppUnitsPerDevPixel();
+
+ // Recompute the size for vh units since it's changed by the dynamic toolbar
+ // max height which is stored in screen coord.
+ if (IsRootContentDocumentCrossProcess()) {
+ AdjustSizeForViewportUnits();
+ }
+
+ // nsSubDocumentFrame uses a AppUnitsPerDevPixel difference between parent and
+ // child document to determine if it needs to build a nsDisplayZoom item. So
+ // if we that changes then we need to invalidate the subdoc frame so that
+ // item gets created/removed.
+ if (mPresShell) {
+ if (nsIFrame* frame = mPresShell->GetRootFrame()) {
+ frame = nsLayoutUtils::GetCrossDocParentFrame(frame);
+ if (frame) {
+ int32_t parentAPD = frame->PresContext()->AppUnitsPerDevPixel();
+ if ((parentAPD == oldAppUnitsPerDevPixel) !=
+ (parentAPD == mCurAppUnitsPerDevPixel)) {
+ frame->InvalidateFrame();
+ }
+ }
+ }
+ }
+
+ // We would also have to look at all of our child subdocuments but the
+ // InvalidatePaintedLayers call above calls InvalidateFrameSubtree which
+ // would invalidate all subdocument frames already.
+}
+
+// static
+void nsPresContext::PreferenceChanged(const char* aPrefName, void* aSelf) {
+ static_cast<nsPresContext*>(aSelf)->PreferenceChanged(aPrefName);
+}
+
+void nsPresContext::PreferenceChanged(const char* aPrefName) {
+ nsDependentCString prefName(aPrefName);
+ if (prefName.EqualsLiteral("layout.css.dpi") ||
+ prefName.EqualsLiteral("layout.css.devPixelsPerPx")) {
+ int32_t oldAppUnitsPerDevPixel = mDeviceContext->AppUnitsPerDevPixel();
+ // We need to assume the DPI changes, since `mDeviceContext` is shared with
+ // other documents, and we'd need to save the return value of the first call
+ // for all of them.
+ Unused << mDeviceContext->CheckDPIChange();
+ if (mPresShell) {
+ OwningNonNull<mozilla::PresShell> presShell(*mPresShell);
+ // 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;
+ RefPtr<nsViewManager> vm = presShell->GetViewManager();
+ if (!vm) {
+ return;
+ }
+ vm->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
+ float oldWidthDevPixels = oldWidthAppUnits / oldAppUnitsPerDevPixel;
+ float oldHeightDevPixels = oldHeightAppUnits / oldAppUnitsPerDevPixel;
+
+ AppUnitsPerDevPixelChanged();
+
+ nscoord width = NSToCoordRound(oldWidthDevPixels * AppUnitsPerDevPixel());
+ nscoord height =
+ NSToCoordRound(oldHeightDevPixels * AppUnitsPerDevPixel());
+ vm->SetWindowDimensions(width, height);
+ }
+ return;
+ }
+
+ if (StringBeginsWith(prefName, "browser.viewport."_ns) ||
+ StringBeginsWith(prefName, "font.size.inflation."_ns) ||
+ prefName.EqualsLiteral("dom.meta-viewport.enabled")) {
+ if (mPresShell) {
+ mPresShell->MaybeReflowForInflationScreenSizeChange();
+ }
+ }
+
+ // Changing any of these potentially changes the value of @media
+ // (prefers-contrast).
+ if (prefName.EqualsLiteral("layout.css.prefers-contrast.enabled") ||
+ prefName.EqualsLiteral("browser.display.document_color_use") ||
+ prefName.EqualsLiteral("privacy.resistFingerprinting") ||
+ prefName.EqualsLiteral("browser.display.foreground_color") ||
+ prefName.EqualsLiteral("browser.display.background_color")) {
+ MediaFeatureValuesChanged({MediaFeatureChangeReason::PreferenceChange},
+ MediaFeatureChangePropagation::JustThisDocument);
+ }
+ if (prefName.EqualsLiteral(GFX_MISSING_FONTS_NOTIFY_PREF)) {
+ if (Preferences::GetBool(GFX_MISSING_FONTS_NOTIFY_PREF)) {
+ if (!mMissingFonts) {
+ mMissingFonts = MakeUnique<gfxMissingFontRecorder>();
+ // trigger reflow to detect missing fonts on the current page
+ mChangeHintForPrefChange |= NS_STYLE_HINT_REFLOW;
+ }
+ } else {
+ if (mMissingFonts) {
+ mMissingFonts->Clear();
+ }
+ mMissingFonts = nullptr;
+ }
+ }
+ if (prefName.EqualsLiteral("font.internaluseonly.changed") &&
+ !IsPrintingOrPrintPreview()) {
+ // If there's a change to the font list, we generally need to reconstruct
+ // frames, as the existing frames may be referring to fonts that are no
+ // longer available. But in the case of a static-clone document used for
+ // printing or print-preview, this is undesirable because the nsPrintJob
+ // is holding weak refs to frames that will get blown away unexpectedly by
+ // this reconstruction. So the prescontext for a print/preview doc ignores
+ // the font-list update.
+ //
+ // This means the print document may still be using cached fonts that are
+ // no longer present in the font list, but that should be safe given that
+ // all the required font instances have already been created, so it won't
+ // be depending on access to the font-list entries.
+ //
+ // XXX Actually, I think it's probably a bad idea to do *any* restyling of
+ // print documents in response to pref changes. We could be in the middle
+ // of printing the document, and reflowing all the frames might cause some
+ // kind of unwanted mid-document discontinuity.
+ mChangeHintForPrefChange |= nsChangeHint_ReconstructFrame;
+ } else if (StringBeginsWith(prefName, "font."_ns) ||
+ // 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.
+ prefName.EqualsLiteral("intl.accept_languages") ||
+ // Changes to bidi prefs need to trigger a reflow (see bug 443629)
+ StringBeginsWith(prefName, "bidi."_ns) ||
+ // Changes to font_rendering prefs need to trigger a reflow
+ StringBeginsWith(prefName, "gfx.font_rendering."_ns)) {
+ mChangeHintForPrefChange |= NS_STYLE_HINT_REFLOW;
+ }
+
+ // We will end up calling InvalidatePreferenceSheets one from each pres
+ // context, but all it's doing is clearing its cached sheet pointers, so it
+ // won't be wastefully recreating the sheet multiple times.
+ //
+ // The first pres context that has its pref changed runnable called will
+ // be the one to cause the reconstruction of the pref style sheet.
+ GlobalStyleSheetCache::InvalidatePreferenceSheets();
+ PreferenceSheet::Refresh();
+ DispatchPrefChangedRunnableIfNeeded();
+
+ if (prefName.EqualsLiteral("nglayout.debug.paint_flashing") ||
+ prefName.EqualsLiteral("nglayout.debug.paint_flashing_chrome")) {
+ mPaintFlashingInitialized = false;
+ return;
+ }
+}
+
+void nsPresContext::DispatchPrefChangedRunnableIfNeeded() {
+ if (mPostedPrefChangedRunnable) {
+ return;
+ }
+
+ nsCOMPtr<nsIRunnable> runnable =
+ NewRunnableMethod("nsPresContext::UpdateAfterPreferencesChanged", this,
+ &nsPresContext::UpdateAfterPreferencesChanged);
+ nsresult rv = Document()->Dispatch(TaskCategory::Other, runnable.forget());
+ if (NS_SUCCEEDED(rv)) {
+ mPostedPrefChangedRunnable = true;
+ }
+}
+
+void nsPresContext::UpdateAfterPreferencesChanged() {
+ mPostedPrefChangedRunnable = false;
+ if (!mPresShell) {
+ return;
+ }
+
+ if (mDocument->IsInChromeDocShell()) {
+ // FIXME(emilio): Do really all these prefs not affect chrome docs? I
+ // suspect we should move this check somewhere else.
+ return;
+ }
+
+ StaticPresData::Get()->InvalidateFontPrefs();
+
+ // Initialize our state from the user preferences
+ GetUserPreferences();
+
+ // update the presShell: tell it to set the preference style rules up
+ mPresShell->UpdatePreferenceStyles();
+
+ InvalidatePaintedLayers();
+ mDeviceContext->FlushFontCache();
+
+ // Preferences require rerunning selector matching because we rebuild
+ // the pref style sheet for some preference changes.
+ RebuildAllStyleData(mChangeHintForPrefChange, RestyleHint::RestyleSubtree());
+ mChangeHintForPrefChange = nsChangeHint(0);
+}
+
+nsresult nsPresContext::Init(nsDeviceContext* aDeviceContext) {
+ NS_ASSERTION(!mInitialized, "attempt to reinit pres context");
+ NS_ENSURE_ARG(aDeviceContext);
+
+ mDeviceContext = aDeviceContext;
+
+ // In certain rare cases (such as changing page mode), we tear down layout
+ // state and re-initialize a new prescontext for a document. Given that we
+ // hang style state off the DOM, we detect that re-initialization case and
+ // lazily drop the servo data. We don't do this eagerly during layout teardown
+ // because that would incur an extra whole-tree traversal that's unnecessary
+ // most of the time.
+ //
+ // FIXME(emilio): I'm pretty sure this doesn't happen after bug 1414999.
+ Element* root = mDocument->GetRootElement();
+ if (root && root->HasServoData()) {
+ RestyleManager::ClearServoDataFromSubtree(root);
+ }
+
+ if (mDeviceContext->SetFullZoom(mFullZoom)) {
+ mDeviceContext->FlushFontCache();
+ }
+ mCurAppUnitsPerDevPixel = mDeviceContext->AppUnitsPerDevPixel();
+
+ mEventManager = new mozilla::EventStateManager();
+
+ mAnimationEventDispatcher = new mozilla::AnimationEventDispatcher(this);
+ mEffectCompositor = new mozilla::EffectCompositor(this);
+ mTransitionManager = MakeUnique<nsTransitionManager>(this);
+ mAnimationManager = MakeUnique<nsAnimationManager>(this);
+
+ if (mDocument->GetDisplayDocument()) {
+ NS_ASSERTION(mDocument->GetDisplayDocument()->GetPresContext(),
+ "Why are we being initialized?");
+ mRefreshDriver =
+ mDocument->GetDisplayDocument()->GetPresContext()->RefreshDriver();
+ } else {
+ dom::Document* parent = mDocument->GetInProcessParentDocument();
+ // 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->GetPresShell(),
+ "How did we end up with a presshell if our parent doesn't "
+ "have one?");
+ if (parent && parent->GetPresContext()) {
+ // XXX the document can change in AttachPresShell, does this work?
+ dom::BrowsingContext* browsingContext = mDocument->GetBrowsingContext();
+ if (browsingContext && !browsingContext->IsTop()) {
+ Element* containingElement =
+ parent->FindContentForSubDocument(mDocument);
+ if (!containingElement->IsXULElement() ||
+ !containingElement->HasAttr(kNameSpaceID_None,
+ nsGkAtoms::forceOwnRefreshDriver)) {
+ mRefreshDriver = parent->GetPresContext()->RefreshDriver();
+ }
+ }
+ }
+
+ if (!mRefreshDriver) {
+ mRefreshDriver = new nsRefreshDriver(this);
+ }
+ }
+
+ // Register callbacks so we're notified when the preferences change
+ Preferences::RegisterPrefixCallbacks(nsPresContext::PreferenceChanged,
+ gPrefixCallbackPrefs, this);
+ Preferences::RegisterCallbacks(nsPresContext::PreferenceChanged,
+ gExactCallbackPrefs, this);
+
+ nsresult rv = mEventManager->Init();
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ mEventManager->SetPresContext(this);
+
+#if defined(MOZ_WIDGET_ANDROID)
+ if (IsRootContentDocumentCrossProcess() &&
+ MOZ_LIKELY(
+ !Preferences::HasUserValue("layout.dynamic-toolbar-max-height"))) {
+ if (BrowserChild* browserChild =
+ BrowserChild::GetFrom(mDocument->GetDocShell())) {
+ mDynamicToolbarMaxHeight = browserChild->GetDynamicToolbarMaxHeight();
+ mDynamicToolbarHeight = mDynamicToolbarMaxHeight;
+ }
+ }
+#endif
+
+#ifdef DEBUG
+ mInitialized = true;
+#endif
+
+ return NS_OK;
+}
+
+// Note: We don't hold a reference on the shell; it has a reference to
+// us
+void nsPresContext::AttachPresShell(mozilla::PresShell* aPresShell) {
+ MOZ_ASSERT(!mPresShell);
+ mPresShell = aPresShell;
+
+ mRestyleManager = MakeUnique<mozilla::RestyleManager>(this);
+
+ // Since CounterStyleManager is also the name of a method of
+ // nsPresContext, it is necessary to prefix the class with the mozilla
+ // namespace here.
+ mCounterStyleManager = new mozilla::CounterStyleManager(this);
+
+ dom::Document* doc = mPresShell->GetDocument();
+ MOZ_ASSERT(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();
+
+ nsIURI* docURI = doc->GetDocumentURI();
+
+ if (IsDynamic() && docURI) {
+ if (!docURI->SchemeIs("chrome") && !docURI->SchemeIs("resource"))
+ mImageAnimationMode = mImageAnimationModePref;
+ else
+ mImageAnimationMode = imgIContainer::kNormalAnimMode;
+ }
+
+ UpdateCharSet(doc->GetDocumentCharacterSet());
+}
+
+void nsPresContext::RecomputeBrowsingContextDependentData() {
+ MOZ_ASSERT(mDocument);
+ dom::Document* doc = mDocument;
+ // Resource documents inherit all this state from their display document.
+ while (dom::Document* outer = doc->GetDisplayDocument()) {
+ doc = outer;
+ }
+ auto* browsingContext = doc->GetBrowsingContext();
+ if (!browsingContext) {
+ // This can legitimately happen for e.g. SVG images. Those just get scaled
+ // as a result of the zoom on the embedder document so it doesn't really
+ // matter...
+ return;
+ }
+ SetFullZoom(browsingContext->FullZoom());
+ SetTextZoom(browsingContext->TextZoom());
+ mDocument->EnumerateExternalResources([](dom::Document& aSubResource) {
+ if (nsPresContext* subResourcePc = aSubResource.GetPresContext()) {
+ subResourcePc->RecomputeBrowsingContextDependentData();
+ }
+ return CallState::Continue;
+ });
+}
+
+void nsPresContext::DetachPresShell() {
+ // The counter style manager's destructor needs to deallocate with the
+ // presshell arena. Disconnect it before nulling out the shell.
+ //
+ // XXXbholley: Given recent refactorings, it probably makes more sense to
+ // just null our mPresShell at the bottom of this function. I'm leaving it
+ // this way to preserve the old ordering, but I doubt anything would break.
+ if (mCounterStyleManager) {
+ mCounterStyleManager->Disconnect();
+ mCounterStyleManager = nullptr;
+ }
+
+ mPresShell = nullptr;
+
+ if (mAnimationEventDispatcher) {
+ mAnimationEventDispatcher->Disconnect();
+ mAnimationEventDispatcher = nullptr;
+ }
+ if (mEffectCompositor) {
+ mEffectCompositor->Disconnect();
+ mEffectCompositor = nullptr;
+ }
+ if (mTransitionManager) {
+ mTransitionManager->Disconnect();
+ mTransitionManager = nullptr;
+ }
+ if (mAnimationManager) {
+ mAnimationManager->Disconnect();
+ mAnimationManager = nullptr;
+ }
+ if (mRestyleManager) {
+ mRestyleManager->Disconnect();
+ mRestyleManager = nullptr;
+ }
+ if (mRefreshDriver && mRefreshDriver->GetPresContext() == this) {
+ mRefreshDriver->Disconnect();
+ // Can't null out the refresh driver here.
+ }
+
+ if (IsRoot()) {
+ nsRootPresContext* thisRoot = static_cast<nsRootPresContext*>(this);
+
+ // Have to cancel our plugin geometry timer, because the
+ // callback for that depends on a non-null presshell.
+ thisRoot->CancelApplyPluginGeometryTimer();
+ }
+}
+
+void nsPresContext::DocumentCharSetChanged(NotNull<const Encoding*> aCharSet) {
+ UpdateCharSet(aCharSet);
+ mDeviceContext->FlushFontCache();
+
+ // If a document contains one or more <script> elements, frame construction
+ // might happen earlier than the UpdateCharSet(), so we need to restyle
+ // descendants to make their style data up-to-date.
+ //
+ // FIXME(emilio): Revisit whether this is true after bug 1438911.
+ RebuildAllStyleData(NS_STYLE_HINT_REFLOW, RestyleHint::RecascadeSubtree());
+}
+
+void nsPresContext::UpdateCharSet(NotNull<const Encoding*> aCharSet) {
+ 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));
+ }
+}
+
+nsPresContext* nsPresContext::GetParentPresContext() const {
+ mozilla::PresShell* presShell = GetPresShell();
+ if (presShell) {
+ nsViewManager* viewManager = presShell->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::GetInProcessRootContentDocumentPresContext() {
+ 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(mPresShell, nullptr);
+ nsViewManager* vm = mPresShell->GetViewManager();
+ NS_ENSURE_TRUE(vm, nullptr);
+ nsView* rootView = vm->GetRootView();
+ NS_ENSURE_TRUE(rootView, nullptr);
+ return rootView->GetNearestWidget(aOffset);
+}
+
+nsIWidget* nsPresContext::GetRootWidget() const {
+ NS_ENSURE_TRUE(mPresShell, nullptr);
+ nsViewManager* vm = mPresShell->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() const {
+ nsPresContext* pc = const_cast<nsPresContext*>(this);
+ for (;;) {
+ nsPresContext* parent = pc->GetParentPresContext();
+ if (!parent) break;
+ pc = parent;
+ }
+ return pc->IsRoot() ? static_cast<nsRootPresContext*>(pc) : nullptr;
+}
+
+// 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);
+ }
+
+ for (nsIContent* childContent = aParent->GetFirstChild(); childContent;
+ childContent = childContent->GetNextSibling()) {
+ SetImgAnimations(childContent, aMode);
+ }
+}
+
+void nsPresContext::SetSMILAnimations(dom::Document* aDoc, uint16_t aNewMode,
+ uint16_t aOldMode) {
+ if (aDoc->HasAnimationController()) {
+ SMILAnimationController* controller = aDoc->GetAnimationController();
+ switch (aNewMode) {
+ case imgIContainer::kNormalAnimMode:
+ case imgIContainer::kLoopOnceAnimMode:
+ if (aOldMode == imgIContainer::kDontAnimMode)
+ controller->Resume(SMILTimeContainer::PAUSE_USERPREF);
+ break;
+
+ case imgIContainer::kDontAnimMode:
+ if (aOldMode != imgIContainer::kDontAnimMode)
+ controller->Pause(SMILTimeContainer::PAUSE_USERPREF);
+ break;
+ }
+ }
+}
+
+void nsPresContext::SetImageAnimationMode(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 (mPresShell) {
+ dom::Document* doc = mPresShell->GetDocument();
+ if (doc) {
+ doc->StyleImageLoader()->SetAnimationMode(aMode);
+
+ Element* rootElement = doc->GetRootElement();
+ if (rootElement) {
+ SetImgAnimations(rootElement, aMode);
+ }
+ SetSMILAnimations(doc, aMode, mImageAnimationMode);
+ }
+ }
+
+ mImageAnimationMode = aMode;
+}
+
+void nsPresContext::UpdateEffectiveTextZoom() {
+ float newZoom = mSystemFontScale * mTextZoom;
+ float minZoom = StaticPrefs::zoom_minPercent() / 100.0f;
+ float maxZoom = StaticPrefs::zoom_maxPercent() / 100.0f;
+
+ if (newZoom < minZoom) {
+ newZoom = minZoom;
+ } else if (newZoom > maxZoom) {
+ newZoom = maxZoom;
+ }
+
+ mEffectiveTextZoom = newZoom;
+
+ // Media queries could have changed, since we changed the meaning
+ // of 'em' units in them.
+ MediaFeatureValuesChanged(
+ {RestyleHint::RecascadeSubtree(), NS_STYLE_HINT_REFLOW,
+ MediaFeatureChangeReason::ZoomChange},
+ MediaFeatureChangePropagation::JustThisDocument);
+}
+
+float nsPresContext::GetDeviceFullZoom() {
+ return mDeviceContext->GetFullZoom();
+}
+
+void nsPresContext::SetFullZoom(float aZoom) {
+ if (!mPresShell || 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;
+ mPresShell->GetViewManager()->GetWindowDimensions(&oldWidthAppUnits,
+ &oldHeightAppUnits);
+ float oldWidthDevPixels = oldWidthAppUnits / float(mCurAppUnitsPerDevPixel);
+ float oldHeightDevPixels = oldHeightAppUnits / float(mCurAppUnitsPerDevPixel);
+ mDeviceContext->SetFullZoom(aZoom);
+
+ NS_ASSERTION(!mSuppressResizeReflow,
+ "two zooms happening at the same time? Impossible!");
+
+ // We can't suppress the resize reflow if we support APZ zooming, as MVM
+ // relies on ResizeReflowIgnoreOverride() actually updating layout to update
+ // the viewport based on that.
+ RefPtr<MobileViewportManager> mvm = mPresShell->GetMobileViewportManager();
+ mSuppressResizeReflow = !mvm;
+
+ mFullZoom = aZoom;
+
+ AppUnitsPerDevPixelChanged();
+
+ mPresShell->GetViewManager()->SetWindowDimensions(
+ NSToCoordRound(oldWidthDevPixels * AppUnitsPerDevPixel()),
+ NSToCoordRound(oldHeightDevPixels * AppUnitsPerDevPixel()));
+
+ mSuppressResizeReflow = false;
+}
+
+void nsPresContext::SetOverrideDPPX(float aDPPX) {
+ // SetOverrideDPPX is called during navigations, including history
+ // traversals. In that case, it's typically called with our current value,
+ // and we don't need to actually do anything.
+ if (aDPPX == GetOverrideDPPX()) {
+ return;
+ }
+
+ mMediaEmulationData.mDPPX = aDPPX;
+ MediaFeatureValuesChanged({MediaFeatureChangeReason::ResolutionChange},
+ MediaFeatureChangePropagation::JustThisDocument);
+}
+
+void nsPresContext::SetOverridePrefersColorScheme(
+ const Maybe<StylePrefersColorScheme>& aOverride) {
+ if (GetOverridePrefersColorScheme() == aOverride) {
+ return;
+ }
+ mMediaEmulationData.mPrefersColorScheme = aOverride;
+ // This is a bit of a lie, but it's the code-path that gets taken for regular
+ // system metrics changes via ThemeChanged().
+ MediaFeatureValuesChanged({MediaFeatureChangeReason::SystemMetricsChange},
+ MediaFeatureChangePropagation::JustThisDocument);
+}
+
+gfxSize nsPresContext::ScreenSizeInchesForFontInflation(bool* aChanged) {
+ if (aChanged) {
+ *aChanged = false;
+ }
+
+ nsDeviceContext* dx = DeviceContext();
+ nsRect clientRect;
+ dx->GetClientRect(clientRect); // FIXME: GetClientRect looks expensive
+ float unitsPerInch = dx->AppUnitsPerPhysicalInch();
+ gfxSize deviceSizeInches(float(clientRect.width) / unitsPerInch,
+ float(clientRect.height) / unitsPerInch);
+
+ if (mLastFontInflationScreenSize == gfxSize(-1.0, -1.0)) {
+ mLastFontInflationScreenSize = deviceSizeInches;
+ }
+
+ if (deviceSizeInches != mLastFontInflationScreenSize && aChanged) {
+ *aChanged = true;
+ mLastFontInflationScreenSize = deviceSizeInches;
+ }
+
+ return deviceSizeInches;
+}
+
+static bool CheckOverflow(const ComputedStyle* aComputedStyle,
+ ScrollStyles* aStyles) {
+ // If they're not styled yet, we'll get around to it when constructing frames
+ // for the element.
+ if (!aComputedStyle) {
+ return false;
+ }
+ const nsStyleDisplay* display = aComputedStyle->StyleDisplay();
+
+ // If they will generate no box, just don't.
+ if (display->mDisplay == StyleDisplay::None ||
+ display->mDisplay == StyleDisplay::Contents) {
+ return false;
+ }
+
+ // NOTE(emilio): This check needs to match the one in
+ // Document::IsPotentiallyScrollable.
+ if (display->OverflowIsVisibleInBothAxis()) {
+ return false;
+ }
+
+ *aStyles =
+ ScrollStyles(*display, ScrollStyles::MapOverflowToValidScrollStyle);
+ return true;
+}
+
+// https://drafts.csswg.org/css-overflow/#overflow-propagation
+//
+// NOTE(emilio): We may need to use out-of-date styles for this, since this is
+// called from nsCSSFrameConstructor::ContentRemoved. We could refactor this a
+// bit to avoid doing that, and also fix correctness issues (we don't invalidate
+// properly when we insert a body element and there is a previous one, for
+// example).
+static Element* GetPropagatedScrollStylesForViewport(
+ nsPresContext* aPresContext, ScrollStyles* aStyles) {
+ Document* document = aPresContext->Document();
+ Element* docElement = document->GetRootElement();
+ // docElement might be null if we're doing this after removing it.
+ if (!docElement) {
+ return nullptr;
+ }
+
+ // Check the style on the document root element
+ const auto* rootStyle = Servo_Element_GetMaybeOutOfDateStyle(docElement);
+ if (CheckOverflow(rootStyle, aStyles)) {
+ // tell caller we stole the overflow style from the root element
+ return docElement;
+ }
+
+ // Don't look in the BODY for non-HTML documents or HTML documents
+ // with non-HTML roots.
+ // XXX this should be earlier; we shouldn't even look at the document root
+ // for non-HTML documents. Fix this once we support explicit CSS styling
+ // of the viewport
+ if (!document->IsHTMLOrXHTML() || !docElement->IsHTMLElement()) {
+ return nullptr;
+ }
+
+ Element* bodyElement = document->AsHTMLDocument()->GetBodyElement();
+ if (!bodyElement) {
+ return nullptr;
+ }
+
+ MOZ_ASSERT(bodyElement->IsHTMLElement(nsGkAtoms::body),
+ "GetBodyElement returned something bogus");
+
+ const auto* bodyStyle = Servo_Element_GetMaybeOutOfDateStyle(bodyElement);
+ if (CheckOverflow(bodyStyle, aStyles)) {
+ // tell caller we stole the overflow style from the body element
+ return bodyElement;
+ }
+
+ return nullptr;
+}
+
+Element* nsPresContext::UpdateViewportScrollStylesOverride() {
+ // Start off with our default styles, and then update them as needed.
+ mViewportScrollStyles =
+ ScrollStyles(StyleOverflow::Auto, StyleOverflow::Auto);
+ mViewportScrollOverrideElement = nullptr;
+ // Don't propagate the scrollbar state in printing or print preview.
+ if (!IsPaginated()) {
+ mViewportScrollOverrideElement =
+ GetPropagatedScrollStylesForViewport(this, &mViewportScrollStyles);
+ }
+
+ dom::Document* document = Document();
+ if (Element* fullscreenElement = document->GetFullscreenElement()) {
+ // If the document is in fullscreen, but the fullscreen element is
+ // not the root element, we should explicitly suppress the scrollbar
+ // here. Note that, we still need to return the original element
+ // the styles are from, so that the state of those elements is not
+ // affected across fullscreen change.
+ if (fullscreenElement != document->GetRootElement() &&
+ fullscreenElement != mViewportScrollOverrideElement) {
+ mViewportScrollStyles =
+ ScrollStyles(StyleOverflow::Hidden, StyleOverflow::Hidden);
+ }
+ }
+ return mViewportScrollOverrideElement;
+}
+
+bool nsPresContext::ElementWouldPropagateScrollStyles(const Element& aElement) {
+ if (aElement.GetParent() && !aElement.IsHTMLElement(nsGkAtoms::body)) {
+ // We certainly won't be propagating from this element.
+ return false;
+ }
+
+ // Go ahead and just call GetPropagatedScrollStylesForViewport, but update
+ // a dummy ScrollStyles we don't care about. It'll do a bit of extra work,
+ // but saves us having to have more complicated code or more code duplication;
+ // in practice we will make this call quite rarely, because we checked for all
+ // the common cases above.
+ ScrollStyles dummy(StyleOverflow::Auto, StyleOverflow::Auto);
+ return GetPropagatedScrollStylesForViewport(this, &dummy) == &aElement;
+}
+
+nsISupports* nsPresContext::GetContainerWeak() const {
+ return mDocument->GetDocShell();
+}
+
+nsDocShell* nsPresContext::GetDocShell() const {
+ return nsDocShell::Cast(mDocument->GetDocShell());
+}
+
+bool nsPresContext::BidiEnabled() const { return Document()->GetBidiEnabled(); }
+
+void nsPresContext::SetBidiEnabled() const { Document()->SetBidiEnabled(); }
+
+void nsPresContext::SetBidi(uint32_t aSource) {
+ // Don't do all this stuff unless the options have changed.
+ if (aSource == GetBidi()) {
+ return;
+ }
+
+ 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 {
+ SetVisualMode(IsVisualCharset(Document()->GetDocumentCharacterSet()));
+ }
+}
+
+uint32_t nsPresContext::GetBidi() const { return Document()->GetBidiOptions(); }
+
+void nsPresContext::RecordInteractionTime(InteractionType aType,
+ const TimeStamp& aTimeStamp) {
+ if (!mInteractionTimeEnabled || aTimeStamp.IsNull()) {
+ return;
+ }
+
+ // Array of references to the member variable of each time stamp
+ // for the different interaction types, keyed by InteractionType.
+ TimeStamp nsPresContext::*interactionTimes[] = {
+ &nsPresContext::mFirstClickTime, &nsPresContext::mFirstKeyTime,
+ &nsPresContext::mFirstMouseMoveTime, &nsPresContext::mFirstScrollTime};
+
+ // Array of histogram IDs for the different interaction types,
+ // keyed by InteractionType.
+ Telemetry::HistogramID histogramIds[] = {
+ Telemetry::TIME_TO_FIRST_CLICK_MS, Telemetry::TIME_TO_FIRST_KEY_INPUT_MS,
+ Telemetry::TIME_TO_FIRST_MOUSE_MOVE_MS,
+ Telemetry::TIME_TO_FIRST_SCROLL_MS};
+
+ TimeStamp& interactionTime =
+ this->*(interactionTimes[static_cast<uint32_t>(aType)]);
+ if (!interactionTime.IsNull()) {
+ // We have already recorded an interaction time.
+ return;
+ }
+
+ // Record the interaction time if it occurs after the first paint
+ // of the top level content document.
+ nsPresContext* inProcessRootPresContext =
+ GetInProcessRootContentDocumentPresContext();
+
+ if (!inProcessRootPresContext ||
+ !inProcessRootPresContext->IsRootContentDocumentCrossProcess()) {
+ // There is no top content pres context, or we are in a cross process
+ // document so we don't care about the interaction time. Record a value
+ // anyways to avoid trying to find the top content pres context in future
+ // interactions.
+ interactionTime = TimeStamp::Now();
+ return;
+ }
+
+ if (inProcessRootPresContext->mFirstNonBlankPaintTime.IsNull() ||
+ inProcessRootPresContext->mFirstNonBlankPaintTime > aTimeStamp) {
+ // Top content pres context has not had a non-blank paint yet
+ // or the event timestamp is before the first non-blank paint,
+ // so don't record interaction time.
+ return;
+ }
+
+ // Check if we are recording the first of any of the interaction types.
+ bool isFirstInteraction = true;
+ for (TimeStamp nsPresContext::*memberPtr : interactionTimes) {
+ TimeStamp& timeStamp = this->*(memberPtr);
+ if (!timeStamp.IsNull()) {
+ isFirstInteraction = false;
+ break;
+ }
+ }
+
+ interactionTime = TimeStamp::Now();
+ // Only the top level content pres context reports first interaction
+ // time to telemetry (if it hasn't already done so).
+ if (this == inProcessRootPresContext) {
+ if (Telemetry::CanRecordExtended()) {
+ double millis =
+ (interactionTime - mFirstNonBlankPaintTime).ToMilliseconds();
+ Telemetry::Accumulate(histogramIds[static_cast<uint32_t>(aType)], millis);
+
+ if (isFirstInteraction) {
+ Telemetry::Accumulate(Telemetry::TIME_TO_FIRST_INTERACTION_MS, millis);
+
+ if (Document()->ShouldIncludeInTelemetry(
+ /* aAllowExtensionURIs = */ false)) {
+ if (auto* wgc = Document()->GetWindowGlobalChild()) {
+ Unused << wgc->SendSubmitTimeToFirstInteractionPreloadTelemetry(
+ millis);
+ }
+ }
+ }
+ }
+ } else {
+ inProcessRootPresContext->RecordInteractionTime(aType, aTimeStamp);
+ }
+}
+
+nsITheme* nsPresContext::EnsureTheme() {
+ MOZ_ASSERT(!mTheme);
+ if (Document()->ShouldAvoidNativeTheme()) {
+ mTheme = do_GetBasicNativeThemeDoNotUseDirectly();
+ } else {
+ mTheme = do_GetNativeThemeDoNotUseDirectly();
+ }
+ MOZ_RELEASE_ASSERT(mTheme);
+ return mTheme;
+}
+
+void nsPresContext::ThemeChanged(widget::ThemeChangeKind aKind) {
+ // NOTE(emilio): This ideally wouldn't need to be a _TEXT() marker, but
+ // otherwise the stack is not captured, see bug 1670046.
+ PROFILER_MARKER_TEXT("ThemeChanged", LAYOUT, MarkerStack::Capture(), ""_ns);
+
+ mPendingThemeChangeKind |= unsigned(aKind);
+
+ if (!mPendingThemeChanged) {
+ sLookAndFeelChanged = true;
+ sThemeChanged = true;
+
+ nsCOMPtr<nsIRunnable> ev =
+ NewRunnableMethod("nsPresContext::ThemeChangedInternal", this,
+ &nsPresContext::ThemeChangedInternal);
+ nsresult rv = Document()->Dispatch(TaskCategory::Other, ev.forget());
+ if (NS_SUCCEEDED(rv)) {
+ mPendingThemeChanged = true;
+ }
+ }
+}
+
+void nsPresContext::ThemeChangedInternal() {
+ mPendingThemeChanged = false;
+
+ const auto kind = widget::ThemeChangeKind(mPendingThemeChangeKind);
+ mPendingThemeChangeKind = 0;
+
+ // Tell the theme that it changed, so it can flush any handles to stale theme
+ // data.
+ if (mTheme && sThemeChanged) {
+ mTheme->ThemeChanged();
+ sThemeChanged = false;
+ }
+
+ if (sLookAndFeelChanged) {
+ // Clear all cached LookAndFeel colors.
+ LookAndFeel::Refresh();
+ sLookAndFeelChanged = false;
+
+ // Vector images (SVG) may be using theme colors so we discard all cached
+ // surfaces. (We could add a vector image only version of DiscardAll, but
+ // in bug 940625 we decided theme changes are rare enough not to bother.)
+ image::SurfaceCacheUtils::DiscardAll();
+
+ if (XRE_IsParentProcess()) {
+ ContentParent::BroadcastThemeUpdate(kind);
+ }
+ }
+
+ // This will force the system metrics to be generated the next time they're
+ // used.
+ nsMediaFeatures::FreeSystemMetrics();
+
+ // Reset default background and foreground colors for the document since they
+ // may be using system colors.
+ PreferenceSheet::Refresh();
+
+ // Changes to system metrics and other look and feel values 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
+ // some reflected (like sizes and such) and some not), and -moz-appearance
+ // (whose changes are not), so we need to recascade for the first, and reflow
+ // for the rest.
+ auto restyleHint = (kind & widget::ThemeChangeKind::Style)
+ ? RestyleHint::RecascadeSubtree()
+ : RestyleHint{0};
+ auto changeHint = (kind & widget::ThemeChangeKind::Layout)
+ ? NS_STYLE_HINT_REFLOW
+ : nsChangeHint(0);
+ MediaFeatureValuesChanged(
+ {restyleHint, changeHint, MediaFeatureChangeReason::SystemMetricsChange},
+ MediaFeatureChangePropagation::All);
+}
+
+void nsPresContext::UIResolutionChanged() {
+ if (!mPendingUIResolutionChanged) {
+ nsCOMPtr<nsIRunnable> ev =
+ NewRunnableMethod("nsPresContext::UIResolutionChangedInternal", this,
+ &nsPresContext::UIResolutionChangedInternal);
+ nsresult rv = Document()->Dispatch(TaskCategory::Other, ev.forget());
+ if (NS_SUCCEEDED(rv)) {
+ mPendingUIResolutionChanged = true;
+ }
+ }
+}
+
+void nsPresContext::UIResolutionChangedSync() {
+ if (!mPendingUIResolutionChanged) {
+ mPendingUIResolutionChanged = true;
+ UIResolutionChangedInternalScale(0.0);
+ }
+}
+
+static void NotifyTabUIResolutionChanged(nsIRemoteTab* aTab, void* aArg) {
+ aTab->NotifyResolutionChanged();
+}
+
+static void NotifyChildrenUIResolutionChanged(nsPIDOMWindowOuter* aWindow) {
+ nsCOMPtr<Document> doc = aWindow->GetExtantDoc();
+ RefPtr<nsPIWindowRoot> topLevelWin = nsContentUtils::GetWindowRoot(doc);
+ if (!topLevelWin) {
+ return;
+ }
+ topLevelWin->EnumerateBrowsers(NotifyTabUIResolutionChanged, nullptr);
+}
+
+void nsPresContext::UIResolutionChangedInternal() {
+ UIResolutionChangedInternalScale(0.0);
+}
+
+void nsPresContext::UIResolutionChangedInternalScale(double aScale) {
+ mPendingUIResolutionChanged = false;
+
+ mDeviceContext->CheckDPIChange(&aScale);
+ if (mCurAppUnitsPerDevPixel != mDeviceContext->AppUnitsPerDevPixel()) {
+ AppUnitsPerDevPixelChanged();
+ }
+
+ // Recursively notify all remote leaf descendants of the change.
+ if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
+ NotifyChildrenUIResolutionChanged(window);
+ }
+
+ auto recurse = [aScale](dom::Document& aSubDoc) {
+ if (nsPresContext* pc = aSubDoc.GetPresContext()) {
+ // For subdocuments, we want to apply the parent's scale, because there
+ // are cases where the subdoc's device context is connected to a widget
+ // that has an out-of-date resolution (it's on a different screen, but
+ // currently hidden, and will not be updated until shown): bug 1249279.
+ pc->UIResolutionChangedInternalScale(aScale);
+ }
+ return CallState::Continue;
+ };
+ mDocument->EnumerateSubDocuments(recurse);
+}
+
+void nsPresContext::EmulateMedium(nsAtom* aMediaType) {
+ MOZ_ASSERT(!aMediaType || aMediaType->IsAsciiLowercase());
+ RefPtr<const nsAtom> oldMedium = Medium();
+ mMediaEmulationData.mMedium = aMediaType;
+
+ if (Medium() != oldMedium) {
+ MediaFeatureValuesChanged({MediaFeatureChangeReason::MediumChange},
+ MediaFeatureChangePropagation::JustThisDocument);
+ }
+}
+
+void nsPresContext::ContentLanguageChanged() {
+ PostRebuildAllStyleDataEvent(nsChangeHint(0),
+ RestyleHint::RecascadeSubtree());
+}
+
+bool nsPresContext::RegisterOneShotPostRefreshObserver(
+ mozilla::OneShotPostRefreshObserver* aObserver) {
+ RefreshDriver()->AddPostRefreshObserver(
+ static_cast<nsAPostRefreshObserver*>(aObserver));
+ mOneShotPostRefreshObservers.AppendElement(aObserver);
+ return true;
+}
+
+void nsPresContext::UnregisterOneShotPostRefreshObserver(
+ mozilla::OneShotPostRefreshObserver* aObserver) {
+ RefreshDriver()->RemovePostRefreshObserver(
+ static_cast<nsAPostRefreshObserver*>(aObserver));
+ DebugOnly<bool> removed =
+ mOneShotPostRefreshObservers.RemoveElement(aObserver);
+ MOZ_ASSERT(removed,
+ "OneShotPostRefreshObserver should be owned by PresContext");
+}
+
+void nsPresContext::ClearOneShotPostRefreshObservers() {
+ for (const auto& observer : mOneShotPostRefreshObservers) {
+ RefreshDriver()->RemovePostRefreshObserver(
+ static_cast<nsAPostRefreshObserver*>(observer));
+ }
+
+ mOneShotPostRefreshObservers.Clear();
+}
+
+void nsPresContext::RebuildAllStyleData(nsChangeHint aExtraHint,
+ const RestyleHint& aRestyleHint) {
+ if (!mPresShell) {
+ // We must have been torn down. Nothing to do here.
+ return;
+ }
+
+ // TODO(emilio): It's unclear to me why would these three calls below be
+ // needed. In particular, RebuildAllStyleData doesn't rebuild rules or
+ // specified style information and such (note the comment in
+ // RestyleManager::RebuildAllStyleData re. the funny semantics), so I
+ // don't know why should we rebuild the user font set / counter styles /
+ // etc...
+ mDocument->MarkUserFontSetDirty();
+ MarkCounterStylesDirty();
+ MarkFontFeatureValuesDirty();
+ PostRebuildAllStyleDataEvent(aExtraHint, aRestyleHint);
+}
+
+void nsPresContext::PostRebuildAllStyleDataEvent(
+ nsChangeHint aExtraHint, const RestyleHint& aRestyleHint) {
+ if (!mPresShell) {
+ // We must have been torn down. Nothing to do here.
+ return;
+ }
+ if (aRestyleHint.DefinitelyRecascadesAllSubtree()) {
+ mUsesExChUnits = false;
+ }
+ RestyleManager()->RebuildAllStyleData(aExtraHint, aRestyleHint);
+}
+
+void nsPresContext::MediaFeatureValuesChanged(
+ const MediaFeatureChange& aChange,
+ MediaFeatureChangePropagation aPropagation) {
+ if (mPresShell) {
+ mPresShell->EnsureStyleFlush();
+ }
+
+ if (!mPendingMediaFeatureValuesChange) {
+ mPendingMediaFeatureValuesChange = MakeUnique<MediaFeatureChange>(aChange);
+ } else {
+ *mPendingMediaFeatureValuesChange |= aChange;
+ }
+
+ if (aPropagation & MediaFeatureChangePropagation::Images) {
+ // Propagate the media feature value change down to any SVG images the
+ // document is using.
+ mDocument->ImageTracker()->MediaFeatureValuesChangedAllDocuments(aChange);
+ }
+
+ if (aPropagation & MediaFeatureChangePropagation::SubDocuments) {
+ // And then into any subdocuments.
+ auto recurse = [&aChange, aPropagation](dom::Document& aSubDoc) {
+ if (nsPresContext* pc = aSubDoc.GetPresContext()) {
+ pc->MediaFeatureValuesChanged(aChange, aPropagation);
+ }
+ return CallState::Continue;
+ };
+ mDocument->EnumerateSubDocuments(recurse);
+ }
+}
+
+bool nsPresContext::FlushPendingMediaFeatureValuesChanged() {
+ if (!mPendingMediaFeatureValuesChange) {
+ return false;
+ }
+
+ MediaFeatureChange change = *mPendingMediaFeatureValuesChange;
+ mPendingMediaFeatureValuesChange.reset();
+
+ // MediumFeaturesChanged updates the applied rules, so it always gets called.
+ if (mPresShell) {
+ change.mRestyleHint |=
+ mPresShell->StyleSet()->MediumFeaturesChanged(change.mReason);
+ }
+
+ const bool changedStyle = change.mRestyleHint || change.mChangeHint;
+ if (changedStyle) {
+ RebuildAllStyleData(change.mChangeHint, change.mRestyleHint);
+ }
+
+ if (mDocument->IsBeingUsedAsImage()) {
+ MOZ_ASSERT(mDocument->MediaQueryLists().isEmpty());
+ return changedStyle;
+ }
+
+ mDocument->NotifyMediaFeatureValuesChanged();
+
+ // https://drafts.csswg.org/cssom-view/#evaluate-media-queries-and-report-changes
+ //
+ // 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.)
+ //
+ // TODO: This should be better integrated into the "update the rendering"
+ // steps: https://html.spec.whatwg.org/#update-the-rendering
+ //
+ // Note that we do this after the new style from media queries in
+ // style sheets has been computed.
+
+ if (mDocument->MediaQueryLists().isEmpty()) {
+ return changedStyle;
+ }
+
+ // We build a list of all the notifications we're going to send
+ // before we send any of them.
+ nsTArray<RefPtr<mozilla::dom::MediaQueryList>> listsToNotify;
+ for (MediaQueryList* mql = mDocument->MediaQueryLists().getFirst(); mql;
+ mql = static_cast<LinkedListElement<MediaQueryList>*>(mql)->getNext()) {
+ if (mql->MediaFeatureValuesChanged()) {
+ listsToNotify.AppendElement(mql);
+ }
+ }
+
+ if (!listsToNotify.IsEmpty()) {
+ nsContentUtils::AddScriptRunner(NS_NewRunnableFunction(
+ "nsPresContext::FlushPendingMediaFeatureValuesChanged",
+ [list = std::move(listsToNotify)] {
+ for (const auto& mql : list) {
+ nsAutoMicroTask mt;
+ mql->FireChangeEvent();
+ }
+ }));
+ }
+
+ return changedStyle;
+}
+
+void nsPresContext::SizeModeChanged(nsSizeMode aSizeMode) {
+ if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
+ nsContentUtils::CallOnAllRemoteChildren(
+ window, [&aSizeMode](BrowserParent* aBrowserParent) -> CallState {
+ aBrowserParent->SizeModeChanged(aSizeMode);
+ return CallState::Continue;
+ });
+ }
+ MediaFeatureValuesChanged({MediaFeatureChangeReason::SizeModeChange},
+ MediaFeatureChangePropagation::SubDocuments);
+}
+
+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) {
+ return;
+ }
+
+ mPrintSettings = aPrintSettings;
+ mDefaultPageMargin = nsMargin();
+ if (!mPrintSettings) {
+ return;
+ }
+
+ // set the presentation context to the value in the print settings
+ mDrawColorBackground = mPrintSettings->GetPrintBGColors();
+ mDrawImageBackground = mPrintSettings->GetPrintBGImages();
+
+ nsIntMargin unwriteableTwips = mPrintSettings->GetUnwriteableMarginInTwips();
+ NS_ASSERTION(unwriteableTwips.top >= 0 && unwriteableTwips.right >= 0 &&
+ unwriteableTwips.bottom >= 0 && unwriteableTwips.left >= 0,
+ "Unwriteable twips should be non-negative");
+
+ nsIntMargin marginTwips = mPrintSettings->GetMarginInTwips();
+ marginTwips.EnsureAtLeast(unwriteableTwips);
+ mDefaultPageMargin = nsPresContext::CSSTwipsToAppUnits(marginTwips);
+}
+
+bool nsPresContext::EnsureVisible() {
+ nsCOMPtr<nsIDocShell> docShell(GetDocShell());
+ if (!docShell) {
+ return false;
+ }
+ nsCOMPtr<nsIContentViewer> cv;
+ docShell->GetContentViewer(getter_AddRefs(cv));
+ // Make sure this is the content viewer we belong with
+ if (!cv || cv->GetPresContext() != this) {
+ return false;
+ }
+ // OK, this is us. We want to call Show() on the content viewer.
+ nsresult result = cv->Show();
+ return NS_SUCCEEDED(result);
+}
+
+#ifdef MOZ_REFLOW_PERF
+void nsPresContext::CountReflows(const char* aName, nsIFrame* aFrame) {
+ if (mPresShell) {
+ mPresShell->CountReflows(aName, aFrame);
+ }
+}
+#endif
+
+bool nsPresContext::HasAuthorSpecifiedRules(const nsIFrame* aFrame,
+ uint32_t aRuleTypeMask) const {
+ const bool padding = aRuleTypeMask & NS_AUTHOR_SPECIFIED_PADDING;
+ const bool borderBackground =
+ aRuleTypeMask & NS_AUTHOR_SPECIFIED_BORDER_OR_BACKGROUND;
+ const auto& style = *aFrame->Style();
+
+ if (padding && style.HasAuthorSpecifiedPadding()) {
+ return true;
+ }
+
+ if (borderBackground && style.HasAuthorSpecifiedBorderOrBackground()) {
+ return true;
+ }
+
+ return false;
+}
+
+gfxUserFontSet* nsPresContext::GetUserFontSet() {
+ return mDocument->GetUserFontSet();
+}
+
+void nsPresContext::UserFontSetUpdated(gfxUserFontEntry* aUpdatedFont) {
+ if (!mPresShell) {
+ return;
+ }
+
+ // Note: this method is called without a font when rules in the userfont set
+ // are updated.
+ //
+ // We can avoid a full restyle if font-metric-dependent units are not in use,
+ // since we know there's no style resolution that would depend on this font
+ // and trigger its load.
+ //
+ // TODO(emilio): We could be more granular if we knew which families have
+ // potentially changed.
+ if (!aUpdatedFont) {
+ auto hint =
+ UsesExChUnits() ? RestyleHint::RecascadeSubtree() : RestyleHint{0};
+ PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW, hint);
+ return;
+ }
+
+ // Iterate over the frame tree looking for frames associated with the
+ // downloadable font family in question. If a frame's nsStyleFont has
+ // the name, check the font group associated with the metrics to see if
+ // it contains that specific font (i.e. the one chosen within the family
+ // given the weight, width, and slant from the nsStyleFont). If it does,
+ // mark that frame dirty and skip inspecting its descendants.
+ if (nsIFrame* root = mPresShell->GetRootFrame()) {
+ nsFontFaceUtils::MarkDirtyForFontChange(root, aUpdatedFont);
+ }
+}
+
+class CounterStyleCleaner final : public nsAPostRefreshObserver {
+ public:
+ CounterStyleCleaner(nsRefreshDriver* aRefreshDriver,
+ CounterStyleManager* aCounterStyleManager)
+ : mRefreshDriver(aRefreshDriver),
+ mCounterStyleManager(aCounterStyleManager) {}
+ virtual ~CounterStyleCleaner() = default;
+
+ void DidRefresh() final {
+ mRefreshDriver->RemovePostRefreshObserver(this);
+ mCounterStyleManager->CleanRetiredStyles();
+ delete this;
+ }
+
+ private:
+ RefPtr<nsRefreshDriver> mRefreshDriver;
+ RefPtr<CounterStyleManager> mCounterStyleManager;
+};
+
+void nsPresContext::FlushCounterStyles() {
+ if (!mPresShell) {
+ return; // we've been torn down
+ }
+ if (mCounterStyleManager->IsInitial()) {
+ // Still in its initial state, no need to clean.
+ return;
+ }
+
+ if (mCounterStylesDirty) {
+ bool changed = mCounterStyleManager->NotifyRuleChanged();
+ if (changed) {
+ PresShell()->NotifyCounterStylesAreDirty();
+ PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW, RestyleHint{0});
+ RefreshDriver()->AddPostRefreshObserver(
+ new CounterStyleCleaner(RefreshDriver(), mCounterStyleManager));
+ }
+ mCounterStylesDirty = false;
+ }
+}
+
+void nsPresContext::MarkCounterStylesDirty() {
+ if (mCounterStyleManager->IsInitial()) {
+ // Still in its initial state, no need to touch anything.
+ return;
+ }
+
+ mCounterStylesDirty = true;
+}
+
+void nsPresContext::NotifyMissingFonts() {
+ if (mMissingFonts) {
+ mMissingFonts->Flush();
+ }
+}
+
+void nsPresContext::EnsureSafeToHandOutCSSRules() {
+ if (!mPresShell->StyleSet()->EnsureUniqueInnerOnCSSSheets()) {
+ // Nothing to do.
+ return;
+ }
+
+ RebuildAllStyleData(nsChangeHint(0), RestyleHint::RestyleSubtree());
+}
+
+void nsPresContext::FireDOMPaintEvent(
+ nsTArray<nsRect>* aList, TransactionId aTransactionId,
+ mozilla::TimeStamp aTimeStamp /* = mozilla::TimeStamp() */) {
+ nsPIDOMWindowInner* ourWindow = mDocument->GetInnerWindow();
+ 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 = ourWindow->GetParentTarget();
+ if (!dispatchTarget) {
+ return;
+ }
+ }
+
+ if (aTimeStamp.IsNull()) {
+ aTimeStamp = mozilla::TimeStamp::Now();
+ }
+ DOMHighResTimeStamp timeStamp = 0;
+ if (ourWindow) {
+ mozilla::dom::Performance* perf = ourWindow->GetPerformance();
+ if (perf) {
+ timeStamp = perf->GetDOMTiming()->TimeStampToDOMHighRes(aTimeStamp);
+ }
+ }
+
+ // Events sent to the window get propagated to the chrome event handler
+ // automatically.
+ //
+ // 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).
+ RefPtr<NotifyPaintEvent> event =
+ NS_NewDOMNotifyPaintEvent(eventTarget, this, nullptr, eAfterPaint, aList,
+ uint64_t(aTransactionId), timeStamp);
+
+ // 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,
+ static_cast<Event*>(event), this, nullptr);
+}
+
+static bool MayHavePaintEventListener(nsPIDOMWindowInner* 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<nsPIDOMWindowInner> window = do_QueryInterface(parentTarget);
+ if (window) return MayHavePaintEventListener(window);
+
+ nsCOMPtr<nsPIWindowRoot> root = do_QueryInterface(parentTarget);
+ EventTarget* browserChildGlobal;
+ return root && (browserChildGlobal = root->GetParentTarget()) &&
+ (manager = browserChildGlobal->GetExistingListenerManager()) &&
+ manager->MayHavePaintEventListener();
+}
+
+bool nsPresContext::MayHavePaintEventListener() {
+ return ::MayHavePaintEventListener(mDocument->GetInnerWindow());
+}
+
+bool nsPresContext::MayHavePaintEventListenerInSubDocument() {
+ if (MayHavePaintEventListener()) {
+ return true;
+ }
+
+ bool result = false;
+ auto recurse = [&result](dom::Document& aSubDoc) {
+ if (nsPresContext* pc = aSubDoc.GetPresContext()) {
+ if (pc->MayHavePaintEventListenerInSubDocument()) {
+ result = true;
+ return CallState::Stop;
+ }
+ }
+ return CallState::Continue;
+ };
+
+ mDocument->EnumerateSubDocuments(recurse);
+ return result;
+}
+
+void nsPresContext::NotifyInvalidation(TransactionId aTransactionId,
+ const nsIntRect& aRect) {
+ // Prevent values from overflow after DevPixelsToAppUnits().
+ //
+ // DevPixelsTopAppUnits() will multiple a factor (60) to the value,
+ // it may make the result value over the edge (overflow) of max or
+ // min value of int32_t. Compute the max sized dev pixel rect that
+ // we can support and intersect with it.
+ nsIntRect clampedRect = nsIntRect::MaxIntRect();
+ clampedRect.ScaleInverseRoundIn(AppUnitsPerDevPixel());
+
+ clampedRect = clampedRect.Intersect(aRect);
+
+ nsRect rect(DevPixelsToAppUnits(clampedRect.x),
+ DevPixelsToAppUnits(clampedRect.y),
+ DevPixelsToAppUnits(clampedRect.width),
+ DevPixelsToAppUnits(clampedRect.height));
+ NotifyInvalidation(aTransactionId, rect);
+}
+
+nsPresContext::TransactionInvalidations* nsPresContext::GetInvalidations(
+ TransactionId aTransactionId) {
+ for (TransactionInvalidations& t : mTransactions) {
+ if (t.mTransactionId == aTransactionId) {
+ return &t;
+ }
+ }
+ return nullptr;
+}
+
+void nsPresContext::NotifyInvalidation(TransactionId aTransactionId,
+ const nsRect& aRect) {
+ 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.
+
+ nsPresContext* pc;
+ for (pc = this; pc; pc = pc->GetParentPresContext()) {
+ TransactionInvalidations* transaction =
+ pc->GetInvalidations(aTransactionId);
+ if (transaction) {
+ break;
+ } else {
+ transaction = pc->mTransactions.AppendElement();
+ transaction->mTransactionId = aTransactionId;
+ }
+ }
+
+ TransactionInvalidations* transaction = GetInvalidations(aTransactionId);
+ MOZ_ASSERT(transaction);
+ transaction->mInvalidations.AppendElement(aRect);
+}
+
+/* static */
+void nsPresContext::NotifySubDocInvalidation(ContainerLayer* aContainer,
+ const nsIntRegion* aRegion) {
+ ContainerLayerPresContext* data = static_cast<ContainerLayerPresContext*>(
+ aContainer->GetUserData(&gNotifySubDocInvalidationData));
+ if (!data) {
+ return;
+ }
+
+ TransactionId transactionId = aContainer->Manager()->GetLastTransactionId();
+ IntRect visibleBounds =
+ aContainer->GetVisibleRegion().GetBounds().ToUnknownRect();
+
+ if (!aRegion) {
+ IntRect rect(IntPoint(0, 0), visibleBounds.Size());
+ data->mPresContext->NotifyInvalidation(transactionId, rect);
+ return;
+ }
+
+ nsIntPoint topLeft = visibleBounds.TopLeft();
+ for (auto iter = aRegion->RectIter(); !iter.Done(); iter.Next()) {
+ nsIntRect rect(iter.Get());
+ // 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(transactionId, rect);
+ }
+}
+
+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);
+}
+
+class DelayedFireDOMPaintEvent : public Runnable {
+ public:
+ DelayedFireDOMPaintEvent(
+ nsPresContext* aPresContext, nsTArray<nsRect>&& aList,
+ TransactionId aTransactionId,
+ const mozilla::TimeStamp& aTimeStamp = mozilla::TimeStamp())
+ : mozilla::Runnable("DelayedFireDOMPaintEvent"),
+ mPresContext(aPresContext),
+ mTransactionId(aTransactionId),
+ mTimeStamp(aTimeStamp),
+ mList(std::move(aList)) {
+ MOZ_ASSERT(mPresContext->GetContainerWeak(),
+ "DOMPaintEvent requested for a detached pres context");
+ }
+ NS_IMETHOD Run() 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, mTransactionId, mTimeStamp);
+ }
+ return NS_OK;
+ }
+
+ RefPtr<nsPresContext> mPresContext;
+ TransactionId mTransactionId;
+ const mozilla::TimeStamp mTimeStamp;
+ nsTArray<nsRect> mList;
+};
+
+void nsPresContext::NotifyRevokingDidPaint(TransactionId aTransactionId) {
+ if ((IsRoot() || !PresShell()->IsVisible()) && mTransactions.IsEmpty()) {
+ return;
+ }
+
+ TransactionInvalidations* transaction = nullptr;
+ for (auto& t : mTransactions) {
+ if (t.mTransactionId == aTransactionId) {
+ transaction = &t;
+ break;
+ }
+ }
+ // If there are no transaction invalidations (which imply callers waiting
+ // on the event) for this revoked id, then we don't need to fire a
+ // MozAfterPaint.
+ if (!transaction) {
+ return;
+ }
+
+ // If there are queued transactions with an earlier id, we can't send
+ // our event now since it will arrive out of order. Set the waiting for
+ // previous transaction flag to true, and we'll send the event when
+ // the others are completed.
+ // If this is the only transaction, then we can send it immediately.
+ if (mTransactions.Length() == 1) {
+ nsCOMPtr<nsIRunnable> ev = new DelayedFireDOMPaintEvent(
+ this, std::move(transaction->mInvalidations),
+ transaction->mTransactionId, mozilla::TimeStamp());
+ nsContentUtils::AddScriptRunner(ev);
+ mTransactions.RemoveElementAt(0);
+ } else {
+ transaction->mIsWaitingForPreviousTransaction = true;
+ }
+
+ auto recurse = [&aTransactionId](dom::Document& aSubDoc) {
+ if (nsPresContext* pc = aSubDoc.GetPresContext()) {
+ pc->NotifyRevokingDidPaint(aTransactionId);
+ }
+ return CallState::Continue;
+ };
+ mDocument->EnumerateSubDocuments(recurse);
+}
+
+void nsPresContext::NotifyDidPaintForSubtree(
+ TransactionId aTransactionId, const mozilla::TimeStamp& aTimeStamp) {
+ if (mFirstContentfulPaintTransactionId && !mHadContentfulPaintComposite) {
+ if (aTransactionId >= *mFirstContentfulPaintTransactionId) {
+ mHadContentfulPaintComposite = true;
+ RefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
+ if (timing && !IsPrintingOrPrintPreview()) {
+ timing->NotifyContentfulPaintForRootContentDocument(aTimeStamp);
+ }
+ }
+ }
+
+ if (IsRoot() && mTransactions.IsEmpty()) {
+ return;
+ }
+
+ if (!PresShell()->IsVisible() && mTransactions.IsEmpty()) {
+ 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).
+
+ bool sent = false;
+ uint32_t i = 0;
+ while (i < mTransactions.Length()) {
+ if (mTransactions[i].mTransactionId <= aTransactionId) {
+ if (!mTransactions[i].mInvalidations.IsEmpty()) {
+ nsCOMPtr<nsIRunnable> ev = new DelayedFireDOMPaintEvent(
+ this, std::move(mTransactions[i].mInvalidations),
+ mTransactions[i].mTransactionId, aTimeStamp);
+ nsContentUtils::AddScriptRunner(ev);
+ sent = true;
+ }
+ mTransactions.RemoveElementAt(i);
+ } else {
+ // If there are transaction which is waiting for this transaction,
+ // we should fire a MozAfterPaint immediately.
+ if (sent && mTransactions[i].mIsWaitingForPreviousTransaction) {
+ nsCOMPtr<nsIRunnable> ev = new DelayedFireDOMPaintEvent(
+ this, std::move(mTransactions[i].mInvalidations),
+ mTransactions[i].mTransactionId, aTimeStamp);
+ nsContentUtils::AddScriptRunner(ev);
+ sent = true;
+ mTransactions.RemoveElementAt(i);
+ continue;
+ }
+ i++;
+ }
+ }
+
+ if (!sent) {
+ nsTArray<nsRect> dummy;
+ nsCOMPtr<nsIRunnable> ev = new DelayedFireDOMPaintEvent(
+ this, std::move(dummy), aTransactionId, aTimeStamp);
+ nsContentUtils::AddScriptRunner(ev);
+ }
+
+ auto recurse = [&aTransactionId, &aTimeStamp](dom::Document& aSubDoc) {
+ if (nsPresContext* pc = aSubDoc.GetPresContext()) {
+ pc->NotifyDidPaintForSubtree(aTransactionId, aTimeStamp);
+ }
+ return CallState::Continue;
+ };
+ mDocument->EnumerateSubDocuments(recurse);
+}
+
+already_AddRefed<nsITimer> nsPresContext::CreateTimer(
+ nsTimerCallbackFunc aCallback, const char* aName, uint32_t aDelay) {
+ nsCOMPtr<nsITimer> timer;
+ NS_NewTimerWithFuncCallback(getter_AddRefs(timer), aCallback, this, aDelay,
+ nsITimer::TYPE_ONE_SHOT, aName,
+ Document()->EventTargetFor(TaskCategory::Other));
+ return timer.forget();
+}
+
+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;
+ }
+ }
+}
+
+bool nsPresContext::HasPendingRestyleOrReflow() {
+ mozilla::PresShell* presShell = PresShell();
+ return presShell->NeedStyleFlush() || presShell->HasPendingReflow();
+}
+
+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() &&
+ StaticPrefs::layout_interruptible_reflow_enabled();
+
+ // 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) {
+ mPresShell->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 (mPendingInterruptFromTest) {
+ mPendingInterruptFromTest = false;
+ mHasPendingInterrupt = true;
+ }
+
+ if (mHasPendingInterrupt) {
+#ifdef NOISY_INTERRUPTIBLE_REFLOW
+ printf("*** DETECTED pending interrupt (time=%lld)\n", PR_Now());
+#endif /* NOISY_INTERRUPTIBLE_REFLOW */
+ mPresShell->FrameNeedsToContinueReflow(aFrame);
+ }
+ return mHasPendingInterrupt;
+}
+
+nsIFrame* nsPresContext::GetPrimaryFrameFor(nsIContent* aContent) {
+ MOZ_ASSERT(aContent, "Don't do that");
+ if (GetPresShell() &&
+ GetPresShell()->GetDocument() == aContent->GetComposedDoc()) {
+ return aContent->GetPrimaryFrame();
+ }
+ return nullptr;
+}
+
+size_t nsPresContext::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const {
+ // Measurement may be added later if DMD finds it is worthwhile.
+ return 0;
+}
+
+bool nsPresContext::IsRootContentDocument() const {
+ // Default to the in process version for now, but we should try
+ // to remove callers of this.
+ return IsRootContentDocumentInProcess();
+}
+
+bool nsPresContext::IsRootContentDocumentInProcess() const {
+ 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::IsRootContentDocumentCrossProcess() const {
+ if (mDocument->IsResourceDoc()) {
+ return false;
+ }
+
+ return mDocument->IsTopLevelContentDocument();
+}
+
+void nsPresContext::NotifyNonBlankPaint() {
+ MOZ_ASSERT(!mHadNonBlankPaint);
+ mHadNonBlankPaint = true;
+ if (IsRootContentDocument()) {
+ RefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
+ if (timing && !IsPrintingOrPrintPreview()) {
+ timing->NotifyNonBlankPaintForRootContentDocument();
+ }
+
+ mFirstNonBlankPaintTime = TimeStamp::Now();
+ }
+}
+
+void nsPresContext::NotifyContentfulPaint() {
+ if (!mHadContentfulPaint) {
+#if defined(MOZ_WIDGET_ANDROID)
+ (new AsyncEventDispatcher(mDocument, u"MozFirstContentfulPaint"_ns,
+ CanBubble::eYes, ChromeOnlyDispatch::eYes))
+ ->PostDOMEvent();
+#endif
+ mHadContentfulPaint = true;
+ if (nsRootPresContext* rootPresContext = GetRootPresContext()) {
+ mFirstContentfulPaintTransactionId =
+ Some(rootPresContext->mRefreshDriver->LastTransactionId().Next());
+ if (nsPIDOMWindowInner* innerWindow = mDocument->GetInnerWindow()) {
+ if (Performance* perf = innerWindow->GetPerformance()) {
+ TimeStamp nowTime =
+ rootPresContext->RefreshDriver()->MostRecentRefresh(
+ /* aEnsureTimerStarted */ false);
+ MOZ_ASSERT(
+ !nowTime.IsNull(),
+ "Most recent refresh timestamp should exist since we are in "
+ "a refresh driver tick");
+ MOZ_ASSERT(rootPresContext->RefreshDriver()->IsInRefresh(),
+ "We should only notify contentful paint during refresh "
+ "driver ticks");
+ RefPtr<PerformancePaintTiming> paintTiming =
+ new PerformancePaintTiming(perf, u"first-contentful-paint"_ns,
+ nowTime);
+ perf->SetFCPTimingEntry(paintTiming);
+ }
+ }
+ }
+ }
+}
+
+void nsPresContext::NotifyPaintStatusReset() {
+ mHadNonBlankPaint = false;
+ mHadContentfulPaint = false;
+#if defined(MOZ_WIDGET_ANDROID)
+ (new AsyncEventDispatcher(mDocument, u"MozPaintStatusReset"_ns,
+ CanBubble::eYes, ChromeOnlyDispatch::eYes))
+ ->PostDOMEvent();
+#endif
+}
+
+void nsPresContext::NotifyDOMContentFlushed() {
+ NS_ENSURE_TRUE_VOID(mPresShell);
+ if (IsRootContentDocument()) {
+ RefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
+ if (timing) {
+ timing->NotifyDOMContentFlushedForRootContentDocument();
+ }
+ }
+}
+
+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;
+}
+
+nscoord nsPresContext::GfxUnitsToAppUnits(gfxFloat aGfxUnits) const {
+ return mDeviceContext->GfxUnitsToAppUnits(aGfxUnits);
+}
+
+gfxFloat nsPresContext::AppUnitsToGfxUnits(nscoord aAppUnits) const {
+ return mDeviceContext->AppUnitsToGfxUnits(aAppUnits);
+}
+
+nscoord nsPresContext::PhysicalMillimetersToAppUnits(float aMM) const {
+ float inches = aMM / MM_PER_INCH_FLOAT;
+ return NSToCoordFloorClamped(
+ inches * float(DeviceContext()->AppUnitsPerPhysicalInch()));
+}
+
+bool nsPresContext::IsDeviceSizePageSize() {
+ nsIDocShell* docShell = GetDocShell();
+ return docShell && docShell->GetDeviceSizeIsPageSize();
+}
+
+uint64_t nsPresContext::GetRestyleGeneration() const {
+ if (!mRestyleManager) {
+ return 0;
+ }
+ return mRestyleManager->GetRestyleGeneration();
+}
+
+uint64_t nsPresContext::GetUndisplayedRestyleGeneration() const {
+ if (!mRestyleManager) {
+ return 0;
+ }
+ return mRestyleManager->GetUndisplayedRestyleGeneration();
+}
+
+nsBidi& nsPresContext::GetBidiEngine() {
+ MOZ_ASSERT(NS_IsMainThread());
+
+ if (!mBidiEngine) {
+ mBidiEngine.reset(new nsBidi());
+ }
+ return *mBidiEngine;
+}
+
+void nsPresContext::FlushFontFeatureValues() {
+ if (!mPresShell) {
+ return; // we've been torn down
+ }
+
+ if (mFontFeatureValuesDirty) {
+ ServoStyleSet* styleSet = mPresShell->StyleSet();
+ mFontFeatureValuesLookup = styleSet->BuildFontFeatureValueSet();
+ mFontFeatureValuesDirty = false;
+ }
+}
+
+void nsPresContext::SetVisibleArea(const nsRect& r) {
+ if (!r.IsEqualEdges(mVisibleArea)) {
+ mVisibleArea = r;
+ mSizeForViewportUnits = mVisibleArea.Size();
+ if (IsRootContentDocumentCrossProcess()) {
+ AdjustSizeForViewportUnits();
+ }
+ // Visible area does not affect media queries when paginated.
+ if (!IsPaginated()) {
+ MediaFeatureValuesChanged(
+ {mozilla::MediaFeatureChangeReason::ViewportChange},
+ MediaFeatureChangePropagation::JustThisDocument);
+ }
+ }
+}
+
+void nsPresContext::SetDynamicToolbarMaxHeight(ScreenIntCoord aHeight) {
+ MOZ_ASSERT(IsRootContentDocumentCrossProcess());
+
+ if (mDynamicToolbarMaxHeight == aHeight) {
+ return;
+ }
+ mDynamicToolbarMaxHeight = aHeight;
+ mDynamicToolbarHeight = aHeight;
+
+ AdjustSizeForViewportUnits();
+
+ if (RefPtr<mozilla::PresShell> presShell = mPresShell) {
+ // Changing the max height of the dynamic toolbar changes the ICB size, we
+ // need to kick a reflow with the current window dimensions since the max
+ // height change doesn't change the window dimensions but
+ // PresShell::ResizeReflow ends up subtracting the new dynamic toolbar
+ // height from the window dimensions and kick a reflow with the proper ICB
+ // size.
+ nscoord currentWidth, currentHeight;
+ presShell->GetViewManager()->GetWindowDimensions(&currentWidth,
+ &currentHeight);
+ presShell->ResizeReflow(currentWidth, currentHeight,
+ ResizeReflowOptions::NoOption);
+ }
+}
+
+void nsPresContext::AdjustSizeForViewportUnits() {
+ MOZ_ASSERT(IsRootContentDocumentCrossProcess());
+ if (mVisibleArea.height == NS_UNCONSTRAINEDSIZE) {
+ // Ignore `NS_UNCONSTRAINEDSIZE` since it's a temporary state during a
+ // reflow. We will end up calling this function again with a proper size in
+ // the same reflow.
+ return;
+ }
+
+ if (MOZ_UNLIKELY(mVisibleArea.height +
+ NSIntPixelsToAppUnits(mDynamicToolbarMaxHeight,
+ mCurAppUnitsPerDevPixel) >
+ nscoord_MAX)) {
+ MOZ_ASSERT_UNREACHABLE("The dynamic toolbar max height is probably wrong");
+ return;
+ }
+
+ mSizeForViewportUnits.height =
+ mVisibleArea.height +
+ NSIntPixelsToAppUnits(mDynamicToolbarMaxHeight, mCurAppUnitsPerDevPixel);
+}
+
+void nsPresContext::UpdateDynamicToolbarOffset(ScreenIntCoord aOffset) {
+ MOZ_ASSERT(IsRootContentDocumentCrossProcess());
+ if (!mPresShell) {
+ return;
+ }
+
+ if (!HasDynamicToolbar()) {
+ return;
+ }
+
+ MOZ_ASSERT(-mDynamicToolbarMaxHeight <= aOffset && aOffset <= 0);
+ if (mDynamicToolbarHeight == mDynamicToolbarMaxHeight + aOffset) {
+ return;
+ }
+
+ // Forcibly flush position:fixed elements in the case where the dynamic
+ // toolbar is going to be completely hidden or starts to be visible so that
+ // %-based style values will be recomputed with the visual viewport size which
+ // is including the area covered by the dynamic toolbar.
+ if (mDynamicToolbarHeight == 0 || aOffset == -mDynamicToolbarMaxHeight) {
+ mPresShell->MarkFixedFramesForReflow(IntrinsicDirty::Resize);
+ mPresShell->AddResizeEventFlushObserverIfNeeded();
+ }
+
+ mDynamicToolbarHeight = mDynamicToolbarMaxHeight + aOffset;
+
+ if (RefPtr<MobileViewportManager> mvm =
+ mPresShell->GetMobileViewportManager()) {
+ mvm->UpdateVisualViewportSizeByDynamicToolbar(-aOffset);
+ }
+}
+
+DynamicToolbarState nsPresContext::GetDynamicToolbarState() const {
+ if (!IsRootContentDocumentCrossProcess() || !HasDynamicToolbar()) {
+ return DynamicToolbarState::None;
+ }
+
+ if (mDynamicToolbarMaxHeight == mDynamicToolbarHeight) {
+ return DynamicToolbarState::Expanded;
+ } else if (mDynamicToolbarHeight == 0) {
+ return DynamicToolbarState::Collapsed;
+ }
+ return DynamicToolbarState::InTransition;
+}
+
+void nsPresContext::SetSafeAreaInsets(const ScreenIntMargin& aSafeAreaInsets) {
+ if (mSafeAreaInsets == aSafeAreaInsets) {
+ return;
+ }
+ mSafeAreaInsets = aSafeAreaInsets;
+
+ PostRebuildAllStyleDataEvent(nsChangeHint(0),
+ RestyleHint::RecascadeSubtree());
+}
+
+#ifdef DEBUG
+
+void nsPresContext::ValidatePresShellAndDocumentReleation() const {
+ NS_ASSERTION(!mPresShell || !mPresShell->GetDocument() ||
+ mPresShell->GetDocument() == mDocument,
+ "nsPresContext doesn't have the same document as nsPresShell!");
+}
+
+#endif // #ifdef DEBUG
+
+nsRootPresContext::nsRootPresContext(dom::Document* aDocument,
+ nsPresContextType aType)
+ : nsPresContext(aDocument, aType) {}
+
+nsRootPresContext::~nsRootPresContext() {
+ NS_ASSERTION(mRegisteredPlugins.Count() == 0,
+ "All plugins should have been unregistered");
+ CancelApplyPluginGeometryTimer();
+}
+
+void nsRootPresContext::RegisterPluginForGeometryUpdates(nsIContent* aPlugin) {
+ mRegisteredPlugins.PutEntry(aPlugin);
+}
+
+void nsRootPresContext::UnregisterPluginForGeometryUpdates(
+ nsIContent* aPlugin) {
+ mRegisteredPlugins.RemoveEntry(aPlugin);
+}
+
+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.
+ for (auto iter = mRegisteredPlugins.Iter(); !iter.Done(); iter.Next()) {
+ auto f =
+ static_cast<nsPluginFrame*>(iter.Get()->GetKey()->GetPrimaryFrame());
+ if (!f) {
+ NS_WARNING("Null frame in ComputePluginGeometryUpdates");
+ continue;
+ }
+ if (!nsLayoutUtils::IsAncestorFrameCrossDoc(aFrame, f)) {
+ // f is not managed by this frame so we should ignore it.
+ continue;
+ }
+ f->SetEmptyWidgetConfiguration();
+ }
+
+ if (aBuilder) {
+ MOZ_ASSERT(aList);
+ nsIFrame* rootFrame = mPresShell->GetRootFrame();
+
+ if (rootFrame && aBuilder->ContainsPluginItem()) {
+ aBuilder->SetForPluginGeometry(true);
+ // 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->InkOverflowRectRelativeToSelf();
+ // nsDisplayPlugin::ComputeVisibility will automatically set a non-hidden
+ // widget configuration for the plugin, if it's visible.
+ aList->ComputeVisibilityForRoot(aBuilder, &region);
+ aBuilder->SetForPluginGeometry(false);
+ }
+ }
+
+#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
+ if (XRE_IsParentProcess()) {
+ 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 PresShell::WillPaintWindow() or from
+ // PresShell::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 = CreateTimer(
+ ApplyPluginGeometryUpdatesCallback, "ApplyPluginGeometryUpdatesCallback",
+ nsRefreshDriver::DefaultInterval() * 2);
+}
+
+void nsRootPresContext::CancelApplyPluginGeometryTimer() {
+ if (mApplyPluginGeometryTimer) {
+ mApplyPluginGeometryTimer->Cancel();
+ mApplyPluginGeometryTimer = nullptr;
+ }
+}
+
+#ifndef XP_MACOSX
+
+static bool HasOverlap(const LayoutDeviceIntPoint& aOffset1,
+ const nsTArray<LayoutDeviceIntRect>& aClipRects1,
+ const LayoutDeviceIntPoint& aOffset2,
+ const nsTArray<LayoutDeviceIntRect>& aClipRects2) {
+ LayoutDeviceIntPoint 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 =
+ std::move(*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;
+ LayoutDeviceIntRect bounds = pluginsToMove[j].mChild->GetBounds();
+ AutoTArray<LayoutDeviceIntRect, 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 void PluginGetGeometryUpdate(
+ nsTHashtable<nsRefPtrHashKey<nsIContent>>& aPlugins,
+ nsTArray<nsIWidget::Configuration>* aConfigurations) {
+ for (auto iter = aPlugins.Iter(); !iter.Done(); iter.Next()) {
+ auto f =
+ static_cast<nsPluginFrame*>(iter.Get()->GetKey()->GetPrimaryFrame());
+ if (!f) {
+ NS_WARNING("Null frame in PluginGeometryUpdate");
+ continue;
+ }
+ f->GetWidgetConfiguration(aConfigurations);
+ }
+}
+
+#endif // #ifndef XP_MACOSX
+
+static void PluginDidSetGeometry(
+ nsTHashtable<nsRefPtrHashKey<nsIContent>>& aPlugins) {
+ for (auto iter = aPlugins.Iter(); !iter.Done(); iter.Next()) {
+ auto f =
+ static_cast<nsPluginFrame*>(iter.Get()->GetKey()->GetPrimaryFrame());
+ if (!f) {
+ NS_WARNING("Null frame in PluginDidSetGeometry");
+ continue;
+ }
+ f->DidSetWidgetGeometry();
+ }
+}
+
+void nsRootPresContext::ApplyPluginGeometryUpdates() {
+#ifndef XP_MACOSX
+ CancelApplyPluginGeometryTimer();
+
+ nsTArray<nsIWidget::Configuration> configurations;
+ PluginGetGeometryUpdate(mRegisteredPlugins, &configurations);
+ // Walk mRegisteredPlugins and ask each plugin for its configuration
+ if (!configurations.IsEmpty()) {
+ nsIWidget* widget = configurations[0].mChild->GetParent();
+ NS_ASSERTION(widget, "Plugins must have a parent window");
+ SortConfigurations(&configurations);
+ widget->ConfigureChildren(configurations);
+ }
+#endif // #ifndef XP_MACOSX
+
+ PluginDidSetGeometry(mRegisteredPlugins);
+}
+
+void nsRootPresContext::CollectPluginGeometryUpdates(
+ LayerManager* aLayerManager) {
+#ifndef XP_MACOSX
+ // Collect and pass plugin widget configurations down to the compositor
+ // for transmission to the chrome process.
+ NS_ASSERTION(aLayerManager, "layer manager is invalid!");
+ mozilla::layers::ClientLayerManager* clm =
+ aLayerManager->AsClientLayerManager();
+
+ nsTArray<nsIWidget::Configuration> configurations;
+ // If there aren't any plugins to configure, clear the plugin data cache
+ // in the layer system.
+ if (!mRegisteredPlugins.Count() && clm) {
+ clm->StorePluginWidgetConfigurations(configurations);
+ return;
+ }
+ PluginGetGeometryUpdate(mRegisteredPlugins, &configurations);
+ if (configurations.IsEmpty()) {
+ PluginDidSetGeometry(mRegisteredPlugins);
+ return;
+ }
+ SortConfigurations(&configurations);
+ if (clm) {
+ clm->StorePluginWidgetConfigurations(configurations);
+ }
+ PluginDidSetGeometry(mRegisteredPlugins);
+#endif // #ifndef XP_MACOSX
+}
+
+void nsRootPresContext::AddWillPaintObserver(nsIRunnable* aRunnable) {
+ if (!mWillPaintFallbackEvent.IsPending()) {
+ mWillPaintFallbackEvent = new RunWillPaintObservers(this);
+ Document()->Dispatch(TaskCategory::Other,
+ do_AddRef(mWillPaintFallbackEvent));
+ }
+ mWillPaintObservers.AppendElement(aRunnable);
+}
+
+/**
+ * Run all runnables that need to get called before the next paint.
+ */
+void nsRootPresContext::FlushWillPaintObservers() {
+ mWillPaintFallbackEvent = nullptr;
+ nsTArray<nsCOMPtr<nsIRunnable>> observers = std::move(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:
+ // - mRegisteredPlugins
+ // - mWillPaintObservers
+ // - mWillPaintFallbackEvent
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-18 22:01:04 +0000