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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 "base/basictypes.h"
#include "nsCRT.h"
#include "nsCOMPtr.h"
#include "nsCSSFrameConstructor.h"
#include "nsDocShell.h"
#include "nsIConsoleService.h"
#include "nsIDocumentViewer.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 "gfxPlatform.h"
#include "nsFontFaceLoader.h"
#include "mozilla/AnimationEventDispatcher.h"
#include "mozilla/EffectCompositor.h"
#include "mozilla/EventListenerManager.h"
#include "prenv.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/dom/FontFaceSet.h"
#include "mozilla/StaticPresData.h"
#include "nsRefreshDriver.h"
#include "LayerUserData.h"
#include "mozilla/dom/NotifyPaintEvent.h"
#include "nsFontCache.h"
#include "nsFrameLoader.h"
#include "nsContentUtils.h"
#include "nsPIWindowRoot.h"
#include "mozilla/Preferences.h"
#include "gfxTextRun.h"
#include "nsFontFaceUtils.h"
#include "COLRFonts.h"
#include "mozilla/ContentBlockingAllowList.h"
#include "mozilla/GlobalStyleSheetCache.h"
#include "mozilla/ServoBindings.h"
#include "mozilla/StaticPrefs_bidi.h"
#include "mozilla/StaticPrefs_layout.h"
#include "mozilla/StaticPrefs_widget.h"
#include "mozilla/StaticPrefs_zoom.h"
#include "mozilla/StyleSheet.h"
#include "mozilla/StyleSheetInlines.h"
#include "mozilla/Telemetry.h"
#include "mozilla/TimelineManager.h"
#include "mozilla/dom/Performance.h"
#include "mozilla/dom/PerformanceMainThread.h"
#include "mozilla/dom/PerformanceTiming.h"
#include "mozilla/dom/PerformancePaintTiming.h"
#include "mozilla/layers/APZThreadUtils.h"
#include "MobileViewportManager.h"
#include "mozilla/dom/ImageTracker.h"
#ifdef ACCESSIBILITY
# include "mozilla/a11y/DocAccessible.h"
#endif
// Needed for Start/Stop of Image Animation
#include "imgIContainer.h"
#include "nsIImageLoadingContent.h"
#include "nsBidiUtils.h"
#include "nsServiceManagerUtils.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;
/**
* 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;
}
struct WeakRunnableMethod : Runnable {
using Method = void (nsPresContext::*)();
WeakRunnableMethod(const char* aName, nsPresContext* aPc, Method aMethod)
: Runnable(aName), mPresContext(aPc), mMethod(aMethod) {}
NS_IMETHOD Run() override {
if (nsPresContext* pc = mPresContext.get()) {
(pc->*mMethod)();
}
return NS_OK;
}
private:
WeakPtr<nsPresContext> mPresContext;
Method mMethod;
};
// When forcing a font-info-update reflow from style, we don't need to reframe,
// but we'll need to restyle to pick up updated font metrics. In order to avoid
// synchronously having to deal with multiple restyles, we use an early refresh
// driver runner, which should prevent flashing for users.
//
// We might do a bit of extra work if the page flushes layout between the
// restyle and when this happens, which is a bit unfortunate, but not worse than
// what we used to do...
//
// A better solution would be to be able to synchronously initialize font
// information from style worker threads, perhaps...
void nsPresContext::ForceReflowForFontInfoUpdateFromStyle() {
if (mPendingFontInfoUpdateReflowFromStyle) {
return;
}
mPendingFontInfoUpdateReflowFromStyle = true;
nsCOMPtr<nsIRunnable> ev = new WeakRunnableMethod(
"nsPresContext::DoForceReflowForFontInfoUpdateFromStyle", this,
&nsPresContext::DoForceReflowForFontInfoUpdateFromStyle);
RefreshDriver()->AddEarlyRunner(ev);
}
void nsPresContext::DoForceReflowForFontInfoUpdateFromStyle() {
mPendingFontInfoUpdateReflowFromStyle = false;
ForceReflowForFontInfoUpdate(false);
}
void nsPresContext::ForceReflowForFontInfoUpdate(bool aNeedsReframe) {
// 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.
if (IsPrintingOrPrintPreview()) {
return;
}
// 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 (auto* fonts = Document()->GetFonts()) {
fonts->GetImpl()->ForgetLocalFaces();
}
FlushFontCache();
if (!mPresShell) {
// RebuildAllStyleData won't do anything without mPresShell.
return;
}
nsChangeHint changeHint =
aNeedsReframe ? nsChangeHint_ReconstructFrame : NS_STYLE_HINT_REFLOW;
// We also need to trigger restyling for ex/ch units changes to take effect,
// if needed.
auto restyleHint = StyleSet()->UsesFontMetrics()
? RestyleHint::RecascadeSubtree()
: RestyleHint{0};
RebuildAllStyleData(changeHint, restyleHint);
}
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),
mTextZoom(1.0),
mFullZoom(1.0),
mLastFontInflationScreenSize(gfxSize(-1.0, -1.0)),
mCurAppUnitsPerDevPixel(0),
mDynamicToolbarMaxHeight(0),
mDynamicToolbarHeight(0),
mPageSize(-1, -1),
mPageScale(0.0),
mPPScale(1.0f),
mViewportScrollOverrideElement(nullptr),
mElementsRestyled(0),
mFramesConstructed(0),
mFramesReflowed(0),
mAnimationTriggeredRestyles(0),
mInterruptChecksToSkip(0),
mNextFrameRateMultiplier(0),
mMeasuredTicksSinceLoading(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),
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),
mPendingThemeChanged(false),
mPendingThemeChangeKind(0),
mPendingUIResolutionChanged(false),
mPendingFontInfoUpdateReflowFromStyle(false),
mIsGlyph(false),
mCounterStylesDirty(true),
mFontFeatureValuesDirty(true),
mFontPaletteValuesDirty(true),
mIsVisual(false),
mInRDMPane(false),
mHasWarnedAboutTooLargeDashedOrDottedRadius(false),
mQuirkSheetAdded(false),
mHadNonBlankPaint(false),
mHadFirstContentfulPaint(false),
mHadNonTickContentfulPaint(false),
mHadContentfulPaintComposite(false),
mNeedsToUpdateHiddenByContentVisibilityForAnimations(false),
mUserInputEventsAllowed(false),
#ifdef DEBUG
mInitialized(false),
#endif
mOverriddenOrEmbedderColorScheme(dom::PrefersColorSchemeOverride::None) {
#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 (StaticPrefs::gfx_missing_fonts_notify()) {
mMissingFonts = MakeUnique<gfxMissingFontRecorder>();
}
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();
}
UpdateFontVisibility();
}
static const char* gExactCallbackPrefs[] = {
"browser.active_color",
"browser.anchor_color",
"browser.visited_color",
"dom.meta-viewport.enabled",
"image.animation_mode",
"intl.accept_languages",
"layout.css.devPixelsPerPx",
"layout.css.dpi",
"layout.css.letter-spacing.model",
"layout.css.text-transform.uppercase-eszett.enabled",
"privacy.trackingprotection.enabled",
"ui.use_standins_for_native_colors",
nullptr,
};
static const char* gPrefixCallbackPrefs[] = {
"bidi.", "browser.display.", "browser.viewport.",
"font.", "gfx.font_rendering.", "layout.css.font-visibility.",
nullptr,
};
void nsPresContext::Destroy() {
if (mEventManager) {
// unclear if these are needed, but can't hurt
mEventManager->NotifyDestroyPresContext(this);
mEventManager->SetPresContext(nullptr);
mEventManager = nullptr;
}
if (mFontCache) {
mFontCache->Destroy();
mFontCache = nullptr;
}
// Unregister preference callbacks
Preferences::UnregisterPrefixCallbacks(nsPresContext::PreferenceChanged,
gPrefixCallbackPrefs, this);
Preferences::UnregisterCallbacks(nsPresContext::PreferenceChanged,
gExactCallbackPrefs, this);
mRefreshDriver = nullptr;
MOZ_ASSERT(mManagedPostRefreshObservers.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
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;
}
PreferenceSheet::EnsureInitialized();
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();
SET_BIDI_OPTION_DIRECTION(bidiOptions, StaticPrefs::bidi_direction());
SET_BIDI_OPTION_TEXTTYPE(bidiOptions, StaticPrefs::bidi_texttype());
SET_BIDI_OPTION_NUMERAL(bidiOptions, StaticPrefs::bidi_numeral());
// We don't need to force reflow: either we are initializing a new
// prescontext or we are being called from PreferenceChanged()
// 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();
FlushFontCache();
MediaFeatureValuesChanged(
{RestyleHint::RecascadeSubtree(), NS_STYLE_HINT_REFLOW,
MediaFeatureChangeReason::ResolutionChange},
MediaFeatureChangePropagation::JustThisDocument);
mCurAppUnitsPerDevPixel = mDeviceContext->AppUnitsPerDevPixel();
#ifdef ACCESSIBILITY
if (mCurAppUnitsPerDevPixel != oldAppUnitsPerDevPixel) {
if (nsAccessibilityService* accService = GetAccService()) {
accService->NotifyOfDevPixelRatioChange(mPresShell,
mCurAppUnitsPerDevPixel);
}
}
#endif
// 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::GetCrossDocParentFrameInProcess(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) {
if (!mPresShell) {
return;
}
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();
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;
UIResolutionChangedInternal();
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")) {
mPresShell->MaybeReflowForInflationScreenSizeChange();
}
auto changeHint = nsChangeHint{0};
auto restyleHint = RestyleHint{0};
// Changing any of these potentially changes the value of @media
// (prefers-contrast).
// The layout.css.prefers-contrast.enabled pref itself is not handled here,
// because that pref doesn't just affect the "live" value of the media query;
// it affects whether it is parsed at all.
if (prefName.EqualsLiteral("browser.display.document_color_use") ||
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 (StaticPrefs::gfx_missing_fonts_notify()) {
if (!mMissingFonts) {
mMissingFonts = MakeUnique<gfxMissingFontRecorder>();
// trigger reflow to detect missing fonts on the current page
changeHint |= NS_STYLE_HINT_REFLOW;
}
} else {
if (mMissingFonts) {
mMissingFonts->Clear();
}
mMissingFonts = nullptr;
}
}
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)) {
changeHint |= NS_STYLE_HINT_REFLOW;
if (StyleSet()->UsesFontMetrics()) {
restyleHint |= RestyleHint::RecascadeSubtree();
}
}
if (prefName.EqualsLiteral(
"layout.css.text-transform.uppercase-eszett.enabled") ||
prefName.EqualsLiteral("layout.css.letter-spacing.model")) {
changeHint |= NS_STYLE_HINT_REFLOW;
}
if (PreferenceSheet::AffectedByPref(prefName)) {
restyleHint |= RestyleHint::RestyleSubtree();
PreferenceSheet::Refresh();
}
// Same, this just frees a bunch of memory.
StaticPresData::Get()->InvalidateFontPrefs();
Document()->SetMayNeedFontPrefsUpdate();
// Initialize our state from the user preferences.
GetUserPreferences();
FlushFontCache();
if (UpdateFontVisibility()) {
changeHint |= NS_STYLE_HINT_REFLOW;
}
// Preferences require rerunning selector matching because we rebuild
// the pref style sheet for some preference changes.
if (changeHint || restyleHint) {
RebuildAllStyleData(changeHint, restyleHint);
}
InvalidatePaintedLayers();
}
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)) {
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);
mTimelineManager = MakeUnique<mozilla::TimelineManager>(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 = mDocument->GetEmbedderElement();
if (!containingElement->IsXULElement() ||
!containingElement->HasAttr(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;
}
bool nsPresContext::UpdateFontVisibility() {
FontVisibility oldValue = mFontVisibility;
/*
* Expected behavior in order of precedence:
* 1 Chrome Rules give User Level (3)
* 2 RFP gives Highest Level (1 aka Base)
* 3 An RFPTarget of Base gives Base Level (1)
* 4 An RFPTarget of LangPack gives LangPack Level (2)
* 5 The value of the Standard Font Visibility Pref
*
* If the ETP toggle is disabled (aka
* ContentBlockingAllowList::Check is true), it will only override 3-5,
* not rules 1 or 2.
*/
// Rule 1: Allow all font access for privileged contexts, including
// chrome and devtools contexts.
if (Document()->ChromeRulesEnabled()) {
mFontVisibility = FontVisibility::User;
return mFontVisibility != oldValue;
}
// Is this a private browsing context?
bool isPrivate = false;
if (nsCOMPtr<nsILoadContext> loadContext = mDocument->GetLoadContext()) {
isPrivate = loadContext->UsePrivateBrowsing();
}
int32_t level;
// Rule 3
if (mDocument->ShouldResistFingerprinting(
RFPTarget::FontVisibilityBaseSystem)) {
// Rule 2: Check RFP pref
// This is inside Rule 3 in case this document is exempted from RFP.
// But if it is not exempted, and RFP is enabled, we return immediately
// to prevent the override below from occurring.
if (nsRFPService::IsRFPPrefEnabled(isPrivate)) {
mFontVisibility = FontVisibility::Base;
return mFontVisibility != oldValue;
}
level = int32_t(FontVisibility::Base);
}
// Rule 4
else if (mDocument->ShouldResistFingerprinting(
RFPTarget::FontVisibilityLangPack)) {
level = int32_t(FontVisibility::LangPack);
}
// Rule 5
else {
level = StaticPrefs::layout_css_font_visibility();
}
// Override Rules 3-5 Only: Determine if the user has exempted the
// domain from tracking protections, if so, use the default value.
if (level != StaticPrefs::layout_css_font_visibility() &&
ContentBlockingAllowList::Check(mDocument->CookieJarSettings())) {
level = StaticPrefs::layout_css_font_visibility();
}
// Clamp result to the valid range of levels.
level = std::max(std::min(level, int32_t(FontVisibility::User)),
int32_t(FontVisibility::Base));
mFontVisibility = FontVisibility(level);
return mFontVisibility != oldValue;
}
void nsPresContext::ReportBlockedFontFamilyName(const nsCString& aFamily,
FontVisibility aVisibility) {
if (!mBlockedFonts.EnsureInserted(aFamily)) {
return;
}
nsAutoString msg;
msg.AppendPrintf(
"Request for font \"%s\" blocked at visibility level %d (requires %d)\n",
aFamily.get(), int(GetFontVisibility()), int(aVisibility));
nsContentUtils::ReportToConsoleNonLocalized(msg, nsIScriptError::warningFlag,
"Security"_ns, mDocument);
}
void nsPresContext::ReportBlockedFontFamily(const fontlist::Family& aFamily) {
auto* fontList = gfxPlatformFontList::PlatformFontList()->SharedFontList();
const nsCString& name = aFamily.DisplayName().AsString(fontList);
ReportBlockedFontFamilyName(name, aFamily.Visibility());
}
void nsPresContext::ReportBlockedFontFamily(const gfxFontFamily& aFamily) {
ReportBlockedFontFamilyName(aFamily.Name(), aFamily.Visibility());
}
void nsPresContext::InitFontCache() {
if (!mFontCache) {
mFontCache = new nsFontCache();
mFontCache->Init(this);
}
}
void nsPresContext::UpdateFontCacheUserFonts(gfxUserFontSet* aUserFontSet) {
if (mFontCache) {
mFontCache->UpdateUserFonts(aUserFontSet);
}
}
already_AddRefed<nsFontMetrics> nsPresContext::GetMetricsFor(
const nsFont& aFont, const nsFontMetrics::Params& aParams) {
InitFontCache();
return mFontCache->GetMetricsFor(aFont, aParams);
}
nsresult nsPresContext::FlushFontCache() {
if (mFontCache) {
mFontCache->Flush();
}
return NS_OK;
}
nsresult nsPresContext::FontMetricsDeleted(const nsFontMetrics* aFontMetrics) {
if (mFontCache) {
mFontCache->FontMetricsDeleted(aFontMetrics);
}
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;
LookAndFeel::HandleGlobalThemeChange();
// Initialize our state from the user preferences, now that we
// have a presshell, and hence a document.
GetUserPreferences();
EnsureTheme();
nsIURI* docURI = doc->GetDocumentURI();
if (IsDynamic() && docURI) {
if (!docURI->SchemeIs("chrome") && !docURI->SchemeIs("resource"))
mImageAnimationMode = mImageAnimationModePref;
else
mImageAnimationMode = imgIContainer::kNormalAnimMode;
}
UpdateCharSet(doc->GetDocumentCharacterSet());
}
Maybe<ColorScheme> nsPresContext::GetOverriddenOrEmbedderColorScheme() const {
if (Medium() == nsGkAtoms::print) {
return Some(ColorScheme::Light);
}
switch (mOverriddenOrEmbedderColorScheme) {
case dom::PrefersColorSchemeOverride::Dark:
return Some(ColorScheme::Dark);
case dom::PrefersColorSchemeOverride::Light:
return Some(ColorScheme::Light);
case dom::PrefersColorSchemeOverride::None:
break;
}
return Nothing();
}
void nsPresContext::SetColorSchemeOverride(
PrefersColorSchemeOverride aOverride) {
auto oldScheme = mDocument->PreferredColorScheme();
mOverriddenOrEmbedderColorScheme = aOverride;
if (mDocument->PreferredColorScheme() != oldScheme) {
MediaFeatureValuesChanged(
MediaFeatureChange::ForPreferredColorSchemeChange(),
MediaFeatureChangePropagation::JustThisDocument);
}
}
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... Medium also doesn't affect those.
return;
}
if (!IsPrintingOrPrintPreview()) {
auto systemZoom = LookAndFeel::SystemZoomSettings();
SetFullZoom(browsingContext->FullZoom() * systemZoom.mFullZoom);
SetTextZoom(browsingContext->TextZoom() * systemZoom.mTextZoom);
SetOverrideDPPX(browsingContext->OverrideDPPX());
}
auto* top = browsingContext->Top();
SetColorSchemeOverride([&] {
auto overriden = top->PrefersColorSchemeOverride();
if (overriden != PrefersColorSchemeOverride::None) {
return overriden;
}
if (!StaticPrefs::
layout_css_iframe_embedder_prefers_color_scheme_content_enabled()) {
return top->GetEmbedderColorSchemes().mPreferred;
}
return browsingContext->GetEmbedderColorSchemes().mPreferred;
}());
SetInRDMPane(top->GetInRDMPane());
if (doc == mDocument) {
// Medium doesn't apply to resource documents, etc.
RefPtr<nsAtom> mediumToEmulate;
if (MOZ_UNLIKELY(!top->GetMediumOverride().IsEmpty())) {
nsAutoString lower;
nsContentUtils::ASCIIToLower(top->GetMediumOverride(), lower);
mediumToEmulate = NS_Atomize(lower);
}
EmulateMedium(mediumToEmulate);
}
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;
CancelManagedPostRefreshObservers();
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 (mTimelineManager) {
mTimelineManager->Disconnect();
mTimelineManager = nullptr;
}
if (mRestyleManager) {
mRestyleManager->Disconnect();
mRestyleManager = nullptr;
}
if (mRefreshDriver && mRefreshDriver->GetPresContext() == this) {
mRefreshDriver->Disconnect();
// Can't null out the refresh driver here.
}
}
struct QueryContainerState {
nsSize mSize;
WritingMode mWm;
StyleContainerType mType;
nscoord GetInlineSize() const { return LogicalSize(mWm, mSize).ISize(mWm); }
bool Changed(const QueryContainerState& aNewState) {
if (mType != aNewState.mType) {
return true;
}
switch (mType) {
case StyleContainerType::Normal:
break;
case StyleContainerType::Size:
return mSize != aNewState.mSize;
case StyleContainerType::InlineSize:
return GetInlineSize() != aNewState.GetInlineSize();
}
return false;
}
};
NS_DECLARE_FRAME_PROPERTY_DELETABLE(ContainerState, QueryContainerState);
void nsPresContext::RegisterContainerQueryFrame(nsIFrame* aFrame) {
mContainerQueryFrames.Add(aFrame);
}
void nsPresContext::UnregisterContainerQueryFrame(nsIFrame* aFrame) {
mContainerQueryFrames.Remove(aFrame);
}
void nsPresContext::FinishedContainerQueryUpdate() {
mUpdatedContainerQueryContents.Clear();
}
bool nsPresContext::UpdateContainerQueryStyles() {
if (mContainerQueryFrames.IsEmpty()) {
return false;
}
AUTO_PROFILER_LABEL_RELEVANT_FOR_JS("Container Query Styles Update", LAYOUT);
AUTO_PROFILER_MARKER_TEXT("UpdateContainerQueryStyles", LAYOUT, {}, ""_ns);
PresShell()->DoFlushLayout(/* aInterruptible = */ false);
AutoTArray<nsIFrame*, 8> framesToUpdate;
bool anyChanged = false;
for (nsIFrame* frame : mContainerQueryFrames.IterFromShallowest()) {
MOZ_ASSERT(frame->IsPrimaryFrame());
auto type = frame->StyleDisplay()->mContainerType;
MOZ_ASSERT(type != StyleContainerType::Normal,
"Non-container frames shouldn't be in this set");
const QueryContainerState newState{frame->GetSize(),
frame->GetWritingMode(), type};
QueryContainerState* oldState = frame->GetProperty(ContainerState());
const bool changed = !oldState || oldState->Changed(newState);
// Make sure to update the state regardless. It's cheap and it keeps tracks
// of both axes correctly even if only one axis is contained.
if (oldState) {
*oldState = newState;
} else {
frame->SetProperty(ContainerState(), new QueryContainerState(newState));
}
if (!changed) {
continue;
}
const bool updatingAncestor = [&] {
for (nsIFrame* f : framesToUpdate) {
if (nsLayoutUtils::IsProperAncestorFrame(f, frame)) {
return true;
}
}
return false;
}();
if (updatingAncestor) {
// We're going to update an ancestor container of this frame already,
// avoid updating this one too until all our ancestor containers are
// updated.
continue;
}
// To prevent unstable layout, only update once per-element per-flush.
if (NS_WARN_IF(!mUpdatedContainerQueryContents.EnsureInserted(
frame->GetContent()))) {
continue;
}
framesToUpdate.AppendElement(frame);
// TODO(emilio): More fine-grained invalidation rather than invalidating the
// whole subtree, probably!
RestyleManager()->PostRestyleEvent(frame->GetContent()->AsElement(),
RestyleHint::RestyleSubtree(),
nsChangeHint(0));
anyChanged = true;
}
return anyChanged;
}
void nsPresContext::DocumentCharSetChanged(NotNull<const Encoding*> aCharSet) {
UpdateCharSet(aCharSet);
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;
}
return vm->GetRootWidget();
}
// 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;
}
bool nsPresContext::UserInputEventsAllowed() {
MOZ_ASSERT(IsRoot());
if (mUserInputEventsAllowed) {
return true;
}
// Special document
if (Document()->IsEverInitialDocument()) {
return true;
}
if (mRefreshDriver->IsThrottled()) {
MOZ_ASSERT(!mPresShell->IsVisible());
// This implies that the BC is not visibile and users can't
// interact with it, so we are okay with handling user inputs here.
return true;
}
if (mMeasuredTicksSinceLoading <
StaticPrefs::dom_input_events_security_minNumTicks()) {
return false;
}
if (!StaticPrefs::dom_input_events_security_minTimeElapsedInMS()) {
return true;
}
dom::Document* doc = Document();
MOZ_ASSERT_IF(StaticPrefs::dom_input_events_security_minNumTicks(),
doc->GetReadyStateEnum() >= Document::READYSTATE_LOADING);
TimeStamp loadingOrRestoredFromBFCacheTime =
doc->GetLoadingOrRestoredFromBFCacheTimeStamp();
MOZ_ASSERT(!loadingOrRestoredFromBFCacheTime.IsNull());
TimeDuration elapsed = TimeStamp::Now() - loadingOrRestoredFromBFCacheTime;
if (elapsed.ToMilliseconds() >=
StaticPrefs::dom_input_events_security_minTimeElapsedInMS()) {
mUserInputEventsAllowed = true;
return true;
}
return false;
}
void nsPresContext::MaybeIncreaseMeasuredTicksSinceLoading() {
MOZ_ASSERT(IsRoot());
if (mMeasuredTicksSinceLoading >=
StaticPrefs::dom_input_events_security_minNumTicks()) {
return;
}
// We consider READYSTATE_LOADING is the point when the page
// becomes interactive
if (Document()->GetReadyStateEnum() >= Document::READYSTATE_LOADING ||
Document()->IsInitialDocument()) {
++mMeasuredTicksSinceLoading;
}
if (mMeasuredTicksSinceLoading <
StaticPrefs::dom_input_events_security_minNumTicks()) {
// Here we are forcing refresh driver to run because we can't always
// guarantee refresh driver will run enough times to meet the minNumTicks
// requirement. i.e. about:blank.
if (!RefreshDriver()->HasPendingTick()) {
RefreshDriver()->InitializeTimer();
}
}
}
bool nsPresContext::NeedsMoreTicksForUserInput() const {
MOZ_ASSERT(IsRoot());
return mMeasuredTicksSinceLoading <
StaticPrefs::dom_input_events_security_minNumTicks();
}
// 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::SetTextZoom(float aTextZoom) {
float newZoom = aTextZoom;
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;
}
if (newZoom == mTextZoom) {
return;
}
mTextZoom = 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);
}
void nsPresContext::SetInRDMPane(bool aInRDMPane) {
if (mInRDMPane == aInRDMPane) {
return;
}
mInRDMPane = aInRDMPane;
RecomputeTheme();
if (mPresShell) {
nsContentUtils::AddScriptRunner(NewRunnableMethod<bool>(
"PresShell::MaybeRecreateMobileViewportManager", mPresShell,
&PresShell::MaybeRecreateMobileViewportManager, true));
}
}
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);
mFullZoom = aZoom;
AppUnitsPerDevPixelChanged();
mPresShell->GetViewManager()->SetWindowDimensions(
NSToCoordRound(oldWidthDevPixels * AppUnitsPerDevPixel()),
NSToCoordRound(oldHeightDevPixels * AppUnitsPerDevPixel()));
}
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);
}
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;
}
//
// 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;
}
if (rootStyle && rootStyle->StyleDisplay()->IsContainAny()) {
return nullptr;
}
// 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 (bodyStyle && bodyStyle->StyleDisplay()->IsContainAny()) {
return nullptr;
}
if (CheckOverflow(bodyStyle, aStyles)) {
// tell caller we stole the overflow style from the body element
return bodyElement;
}
return nullptr;
}
Element* nsPresContext::UpdateViewportScrollStylesOverride() {
ScrollStyles oldViewportScrollStyles = mViewportScrollStyles;
// 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* fsElement = document->GetUnretargetedFullscreenElement()) {
// 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 (fsElement != document->GetRootElement() &&
fsElement != mViewportScrollOverrideElement) {
mViewportScrollStyles =
ScrollStyles(StyleOverflow::Hidden, StyleOverflow::Hidden);
}
}
if (mViewportScrollStyles != oldViewportScrollStyles) {
if (mPresShell) {
if (nsIFrame* frame = mPresShell->GetRootFrame()) {
frame->SchedulePaint();
}
}
}
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;