gecko-dev/layout/base/nsPresContext.cpp

2739 строки
91 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* a presentation of a document, part 1 */
#include "nsPresContext.h"
#include "nsPresContextInlines.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Encoding.h"
#include "mozilla/EventDispatcher.h"
#include "mozilla/EventStateManager.h"
#include "mozilla/PresShell.h"
#include "base/basictypes.h"
#include "nsCOMPtr.h"
#include "nsCSSFrameConstructor.h"
#include "nsIPresShellInlines.h"
#include "nsDocShell.h"
#include "nsIContentViewer.h"
#include "nsPIDOMWindow.h"
#include "mozilla/ServoStyleSet.h"
#include "nsIContent.h"
#include "nsIFrame.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/TabChild.h"
#include "mozilla/dom/TabParent.h"
#include "nsRefreshDriver.h"
#include "Layers.h"
#include "LayerUserData.h"
#include "ClientLayerManager.h"
#include "mozilla/dom/NotifyPaintEvent.h"
#include "gfxPrefs.h"
#include "nsIDOMChromeWindow.h"
#include "nsFrameLoader.h"
#include "nsContentUtils.h"
#include "nsPIWindowRoot.h"
#include "mozilla/Preferences.h"
#include "gfxTextRun.h"
#include "nsFontFaceUtils.h"
#include "nsLayoutStylesheetCache.h"
#include "mozilla/ServoBindings.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/layers/APZThreadUtils.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() {
// 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)
: mType(aType),
mPresShell(nullptr),
mDocument(aDocument),
mMedium(aType == eContext_Galley ? nsGkAtoms::screen : nsGkAtoms::print),
mMediaEmulated(mMedium),
mLinkHandler(nullptr),
mInflationDisabledForShrinkWrap(false),
mSystemFontScale(1.0),
mTextZoom(1.0),
mEffectiveTextZoom(1.0),
mFullZoom(1.0),
mOverrideDPPX(0.0),
mLastFontInflationScreenSize(gfxSize(-1.0, -1.0)),
mCurAppUnitsPerDevPixel(0),
mAutoQualityMinFontSizePixelsPref(0),
mPageSize(-1, -1),
mPageScale(0.0),
mPPScale(1.0f),
mViewportScrollOverrideElement(nullptr),
mViewportScrollStyles(StyleOverflow::Auto, StyleOverflow::Auto),
mExistThrottledUpdates(false),
// mImageAnimationMode is initialised below, in constructor body
mImageAnimationModePref(imgIContainer::kNormalAnimMode),
mInterruptChecksToSkip(0),
mNextFrameRateMultiplier(0),
mElementsRestyled(0),
mFramesConstructed(0),
mFramesReflowed(0),
mInteractionTimeEnabled(true),
mHasPendingInterrupt(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),
mPendingSysColorChanged(false),
mPendingThemeChanged(false),
mPendingUIResolutionChanged(false),
mPrefChangePendingNeedsReflow(false),
mPostedPrefChangedRunnable(false),
mIsEmulatingMedia(false),
mIsGlyph(false),
mUsesRootEMUnits(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>();
}
}
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",
nullptr,
};
static const char* gPrefixCallbackPrefs[] = {
"font.", "browser.display.", "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(
PREF_CHANGE_METHOD(nsPresContext::PreferenceChanged),
gPrefixCallbackPrefs, this);
Preferences::UnregisterCallbacks(
PREF_CHANGE_METHOD(nsPresContext::PreferenceChanged), gExactCallbackPrefs,
this);
mRefreshDriver = nullptr;
}
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);
tmp->Destroy();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
// whether no native theme service exists;
// if this gets set to true, we'll stop asking for it.
static bool sNoTheme = false;
// Set to true when LookAndFeelChanged needs to be called. This is used
// because the look and feel is a service, so there's no need to notify it from
// more than one prescontext.
static bool sLookAndFeelChanged;
// Set to true when ThemeChanged needs to be called on mTheme. This is used
// because mTheme is a service, so there's no need to notify it from more than
// one prescontext.
static bool sThemeChanged;
bool nsPresContext::IsChrome() const {
return Document()->IsInChromeDocShell();
}
bool nsPresContext::IsChromeOriginImage() const {
return Document()->IsBeingUsedAsImage() &&
Document()->IsDocumentURISchemeChrome();
}
void nsPresContext::GetDocumentColorPreferences() {
// Make sure the preferences are initialized. In the normal run,
// they would already be, because gfxPlatform would have been created,
// but in some reference tests, that is not the case.
gfxPrefs::GetSingleton();
PreferenceSheet::EnsureInitialized();
}
void nsPresContext::GetUserPreferences() {
if (!GetPresShell()) {
// No presshell means nothing to do here. We'll do this when we
// get a presshell.
return;
}
mAutoQualityMinFontSizePixelsPref =
Preferences::GetInt("browser.display.auto_quality_min_font_size");
// * document colors
GetDocumentColorPreferences();
mSendAfterPaintToContent = Preferences::GetBool(
"dom.send_after_paint_to_content", mSendAfterPaintToContent);
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});
mCurAppUnitsPerDevPixel = mDeviceContext->AppUnitsPerDevPixel();
// 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.
}
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();
if (mDeviceContext->CheckDPIChange() && 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 (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
mPrefChangePendingNeedsReflow = true;
}
} else {
if (mMissingFonts) {
mMissingFonts->Clear();
}
mMissingFonts = nullptr;
}
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("font.")) ||
prefName.EqualsLiteral("intl.accept_languages")) {
// Changes to font family preferences don't change anything in the
// computed style data, so the style system won't generate a reflow
// hint for us. We need to do that manually.
// FIXME We could probably also handle changes to
// browser.display.auto_quality_min_font_size here, but that
// probably also requires clearing the text run cache, so don't
// bother (yet, anyway).
mPrefChangePendingNeedsReflow = true;
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("bidi."))) {
// Changes to bidi prefs need to trigger a reflow (see bug 443629)
mPrefChangePendingNeedsReflow = true;
// Changes to bidi.numeral also needs to empty the text run cache.
// This is handled in gfxTextRunWordCache.cpp.
}
if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("gfx.font_rendering."))) {
// Changes to font_rendering prefs need to trigger a reflow
mPrefChangePendingNeedsReflow = true;
}
// We 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.
nsLayoutStylesheetCache::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();
nsChangeHint hint = nsChangeHint(0);
if (mPrefChangePendingNeedsReflow) {
hint |= NS_STYLE_HINT_REFLOW;
}
// Preferences require rerunning selector matching because we rebuild
// the pref style sheet for some preference changes.
RebuildAllStyleData(hint, RestyleHint::RestyleSubtree());
}
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->GetParentDocument();
// Unfortunately, sometimes |parent| here has no presshell because
// printing screws up things. Assert that in other cases it does,
// but whenever the shell is null just fall back on using our own
// refresh driver.
NS_ASSERTION(
!parent || mDocument->IsStaticDocument() || parent->GetPresShell(),
"How did we end up with a presshell if our parent doesn't "
"have one?");
if (parent && parent->GetPresContext()) {
nsCOMPtr<nsIDocShellTreeItem> ourItem = mDocument->GetDocShell();
if (ourItem) {
nsCOMPtr<nsIDocShellTreeItem> parentItem;
ourItem->GetSameTypeParent(getter_AddRefs(parentItem));
if (parentItem) {
Element* containingElement =
parent->FindContentForSubDocument(mDocument);
if (!containingElement->IsXULElement() ||
!containingElement->HasAttr(kNameSpaceID_None,
nsGkAtoms::forceOwnRefreshDriver)) {
mRefreshDriver = parent->GetPresContext()->RefreshDriver();
}
}
}
}
if (!mRefreshDriver) {
mRefreshDriver = new nsRefreshDriver(this);
if (XRE_IsContentProcess()) {
mRefreshDriver->InitializeTimer();
}
}
}
// Register callbacks so we're notified when the preferences change
Preferences::RegisterPrefixCallbacks(
PREF_CHANGE_METHOD(nsPresContext::PreferenceChanged),
gPrefixCallbackPrefs, this);
Preferences::RegisterCallbacks(
PREF_CHANGE_METHOD(nsPresContext::PreferenceChanged), gExactCallbackPrefs,
this);
nsresult rv = mEventManager->Init();
NS_ENSURE_SUCCESS(rv, rv);
mEventManager->SetPresContext(this);
#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) {
bool isChrome = false;
bool isRes = false;
docURI->SchemeIs("chrome", &isChrome);
docURI->SchemeIs("resource", &isRes);
if (!isChrome && !isRes)
mImageAnimationMode = mImageAnimationModePref;
else
mImageAnimationMode = imgIContainer::kNormalAnimMode;
}
UpdateCharSet(doc->GetDocumentCharacterSet());
}
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::DoChangeCharSet(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));
}
}
void nsPresContext::DispatchCharSetChange(NotNull<const Encoding*> aEncoding) {
// In Servo RebuildAllStyleData is async, so no need to do the runnable dance.
DoChangeCharSet(aEncoding);
}
nsPresContext* nsPresContext::GetParentPresContext() {
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::GetToplevelContentDocumentPresContext() {
if (IsChrome()) return nullptr;
nsPresContext* pc = this;
for (;;) {
nsPresContext* parent = pc->GetParentPresContext();
if (!parent || parent->IsChrome()) return pc;
pc = parent;
}
}
nsIWidget* nsPresContext::GetNearestWidget(nsPoint* aOffset) {
NS_ENSURE_TRUE(mPresShell, nullptr);
nsIFrame* frame = mPresShell->GetRootFrame();
NS_ENSURE_TRUE(frame, nullptr);
return frame->GetView()->GetNearestWidget(aOffset);
}
nsIWidget* nsPresContext::GetRootWidget() {
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() {
nsPresContext* pc = 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 = nsLayoutUtils::MinZoom();
float maxZoom = nsLayoutUtils::MaxZoom();
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});
}
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!");
mSuppressResizeReflow = true;
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 == mOverrideDPPX) {
return;
}
mOverrideDPPX = aDPPX;
MediaFeatureValuesChanged({MediaFeatureChangeReason::ResolutionChange});
}
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(ComputedStyle* aComputedStyle,
ScrollStyles* aStyles) {
const nsStyleDisplay* display = aComputedStyle->StyleDisplay();
if (display->mOverflowX == StyleOverflow::Visible &&
display->mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_AUTO &&
display->mOverscrollBehaviorX == StyleOverscrollBehavior::Auto &&
display->mOverscrollBehaviorY == StyleOverscrollBehavior::Auto &&
display->mScrollSnapType.strictness == StyleScrollSnapStrictness::None &&
display->mScrollSnapPointsX == nsStyleCoord(eStyleUnit_None) &&
display->mScrollSnapPointsY == nsStyleCoord(eStyleUnit_None) &&
display->mScrollSnapDestination.horizontal == LengthPercentage::Zero() &&
display->mScrollSnapDestination.vertical == LengthPercentage::Zero()) {
return false;
}
WritingMode writingMode = WritingMode(aComputedStyle);
if (display->mOverflowX == StyleOverflow::MozHiddenUnscrollable) {
*aStyles = ScrollStyles(writingMode, StyleOverflow::Hidden,
StyleOverflow::Hidden, display);
} else {
*aStyles = ScrollStyles(writingMode, display);
}
return true;
}
// https://drafts.csswg.org/css-overflow/#overflow-propagation
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
ServoStyleSet* styleSet = aPresContext->StyleSet();
RefPtr<ComputedStyle> rootStyle = styleSet->ResolveStyleLazily(*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) {
// No body, nothing to do here.
return nullptr;
}
MOZ_ASSERT(bodyElement->IsHTMLElement(nsGkAtoms::body),
"GetBodyElement returned something bogus");
// FIXME(emilio): We could make these just a ResolveServoStyle call if we
// looked at `display` on the root, and updated styles properly before doing
// this on first construction:
//
// https://github.com/w3c/csswg-drafts/issues/3779
RefPtr<ComputedStyle> bodyStyle = styleSet->ResolveStyleLazily(*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) {
MOZ_ASSERT(IsPaginated(), "Should only be called on paginated contexts");
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 GetDocShell(); }
nsIDocShell* nsPresContext::GetDocShell() const {
return mDocument->GetDocShell();
}
/* virtual */
void nsPresContext::Detach() { SetLinkHandler(nullptr); }
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(); }
bool nsPresContext::IsTopLevelWindowInactive() {
return Document()->IsTopLevelWindowInactive();
}
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* topContentPresContext =
GetToplevelContentDocumentPresContext();
if (!topContentPresContext) {
// There is no top content pres context 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 (topContentPresContext->mFirstNonBlankPaintTime.IsNull() ||
topContentPresContext->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 == topContentPresContext) {
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);
}
}
} else {
topContentPresContext->RecordInteractionTime(aType, aTimeStamp);
}
}
nsITheme* nsPresContext::GetTheme() {
if (!sNoTheme && !mTheme) {
mTheme = do_GetNativeTheme();
if (!mTheme) sNoTheme = true;
}
return mTheme;
}
void nsPresContext::ThemeChanged() {
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;
}
}
}
static bool NotifyThemeChanged(TabParent* aTabParent, void* aArg) {
aTabParent->ThemeChanged();
return false;
}
void nsPresContext::ThemeChangedInternal() {
mPendingThemeChanged = false;
// Tell the theme that it changed, so it can flush any handles to stale theme
// data.
if (mTheme && sThemeChanged) {
mTheme->ThemeChanged();
sThemeChanged = false;
}
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();
}
RefreshSystemMetrics();
// Recursively notify all remote leaf descendants that the
// system theme has changed.
if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
nsContentUtils::CallOnAllRemoteChildren(window, NotifyThemeChanged,
nullptr);
}
}
void nsPresContext::SysColorChanged() {
if (!mPendingSysColorChanged) {
sLookAndFeelChanged = true;
nsCOMPtr<nsIRunnable> ev =
NewRunnableMethod("nsPresContext::SysColorChangedInternal", this,
&nsPresContext::SysColorChangedInternal);
nsresult rv = Document()->Dispatch(TaskCategory::Other, ev.forget());
if (NS_SUCCEEDED(rv)) {
mPendingSysColorChanged = true;
}
}
}
void nsPresContext::SysColorChangedInternal() {
mPendingSysColorChanged = false;
if (sLookAndFeelChanged) {
// Don't use the cached values for the system colors
LookAndFeel::Refresh();
sLookAndFeelChanged = false;
}
// Invalidate cached '-moz-windows-accent-color-applies' media query:
RefreshSystemMetrics();
PreferenceSheet::Refresh();
// Reset default background and foreground colors for the document since
// they may be using system colors
GetDocumentColorPreferences();
// The system color values are computed to colors in the style data,
// so normal style data comparison is sufficient here.
RebuildAllStyleData(nsChangeHint(0), RestyleHint{0});
}
void nsPresContext::RefreshSystemMetrics() {
// This will force the system metrics to be generated the next time they're
// used.
nsMediaFeatures::FreeSystemMetrics();
// Changes to system metrics can change media queries on them.
//
// Changes in theme can change system colors (whose changes are
// properly reflected in computed style data), system fonts (whose
// changes are not), and -moz-appearance (whose changes likewise are
// not), so we need to recascade for the first, and reflow for the rest.
MediaFeatureValuesChangedAllDocuments({
RestyleHint::RecascadeSubtree(),
NS_STYLE_HINT_REFLOW,
MediaFeatureChangeReason::SystemMetricsChange,
});
}
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*/
bool nsPresContext::UIResolutionChangedSubdocumentCallback(
dom::Document* aDocument, void* aData) {
nsPresContext* pc = aDocument->GetPresContext();
if (pc) {
// 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.
double scale = *static_cast<double*>(aData);
pc->UIResolutionChangedInternalScale(scale);
}
return true;
}
static void NotifyTabUIResolutionChanged(TabParent* aTab, void* aArg) {
aTab->UIResolutionChanged();
}
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);
}
mDocument->EnumerateSubDocuments(UIResolutionChangedSubdocumentCallback,
&aScale);
}
void nsPresContext::EmulateMedium(const nsAString& aMediaType) {
nsAtom* previousMedium = Medium();
mIsEmulatingMedia = true;
nsAutoString mediaType;
nsContentUtils::ASCIIToLower(aMediaType, mediaType);
mMediaEmulated = NS_Atomize(mediaType);
if (mMediaEmulated != previousMedium && mPresShell) {
MediaFeatureValuesChanged({MediaFeatureChangeReason::MediumChange});
}
}
void nsPresContext::StopEmulatingMedium() {
nsAtom* previousMedium = Medium();
mIsEmulatingMedia = false;
if (Medium() != previousMedium) {
MediaFeatureValuesChanged({MediaFeatureChangeReason::MediumChange});
}
}
void nsPresContext::ContentLanguageChanged() {
PostRebuildAllStyleDataEvent(nsChangeHint(0),
RestyleHint::RecascadeSubtree());
}
void nsPresContext::MediaFeatureValuesChanged(
const MediaFeatureChange& aChange) {
if (mPresShell) {
mPresShell->EnsureStyleFlush();
}
if (!mPendingMediaFeatureValuesChange) {
mPendingMediaFeatureValuesChange.emplace(aChange);
return;
}
*mPendingMediaFeatureValuesChange |= aChange;
}
void nsPresContext::RebuildAllStyleData(nsChangeHint aExtraHint,
RestyleHint aRestyleHint) {
if (!mPresShell) {
// We must have been torn down. Nothing to do here.
return;
}
// FIXME(emilio): Why is it safe to reset mUsesRootEMUnits / mUsesEXChUnits
// here if there's no restyle hint? That looks pretty bogus.
mUsesRootEMUnits = false;
mUsesExChUnits = false;
// 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();
RestyleManager()->RebuildAllStyleData(aExtraHint, aRestyleHint);
}
void nsPresContext::PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint,
RestyleHint aRestyleHint) {
if (!mPresShell) {
// We must have been torn down. Nothing to do here.
return;
}
RestyleManager()->PostRebuildAllStyleDataEvent(aExtraHint, aRestyleHint);
}
static bool MediaFeatureValuesChangedAllDocumentsCallback(Document* aDocument,
void* aChange) {
auto* change = static_cast<const MediaFeatureChange*>(aChange);
if (nsPresContext* pc = aDocument->GetPresContext()) {
pc->MediaFeatureValuesChangedAllDocuments(*change);
}
return true;
}
void nsPresContext::MediaFeatureValuesChangedAllDocuments(
const MediaFeatureChange& aChange) {
MediaFeatureValuesChanged(aChange);
mDocument->EnumerateSubDocuments(
MediaFeatureValuesChangedAllDocumentsCallback,
const_cast<MediaFeatureChange*>(&aChange));
}
void nsPresContext::FlushPendingMediaFeatureValuesChanged() {
if (!mPendingMediaFeatureValuesChange) {
return;
}
MediaFeatureChange change = *mPendingMediaFeatureValuesChange;
mPendingMediaFeatureValuesChange.reset();
// MediumFeaturesChanged updates the applied rules, so it always gets called.
if (mPresShell) {
change.mRestyleHint |=
mPresShell->StyleSet()->MediumFeaturesChanged(change.mReason);
}
if (change.mRestyleHint || change.mChangeHint) {
RebuildAllStyleData(change.mChangeHint, change.mRestyleHint);
}
if (!mPresShell || !mPresShell->DidInitialize()) {
return;
}
if (mDocument->IsBeingUsedAsImage()) {
MOZ_ASSERT(mDocument->MediaQueryLists().isEmpty());
return;
}
mDocument->NotifyMediaFeatureValuesChanged();
MOZ_DIAGNOSTIC_ASSERT(nsContentUtils::IsSafeToRunScript());
// Media query list listeners should be notified from a queued task
// (in HTML5 terms), although we also want to notify them on certain
// flushes. (We're already running off an event.)
//
// Note that we do this after the new style from media queries in
// style sheets has been computed.
if (mDocument->MediaQueryLists().isEmpty()) {
return;
}
// We build a list of all the notifications we're going to send
// before we send any of them.
// Copy pointers to all the lists into a new array, in case one of our
// notifications modifies the list.
nsTArray<RefPtr<mozilla::dom::MediaQueryList>> localMediaQueryLists;
for (MediaQueryList* mql = mDocument->MediaQueryLists().getFirst(); mql;
mql = static_cast<LinkedListElement<MediaQueryList>*>(mql)->getNext()) {
localMediaQueryLists.AppendElement(mql);
}
// Now iterate our local array of the lists.
for (const auto& mql : localMediaQueryLists) {
nsAutoMicroTask mt;
mql->MaybeNotify();
}
}
static bool NotifyTabSizeModeChanged(TabParent* aTab, void* aArg) {
nsSizeMode* sizeMode = static_cast<nsSizeMode*>(aArg);
aTab->SizeModeChanged(*sizeMode);
return false;
}
void nsPresContext::SizeModeChanged(nsSizeMode aSizeMode) {
if (nsPIDOMWindowOuter* window = mDocument->GetWindow()) {
nsContentUtils::CallOnAllRemoteChildren(window, NotifyTabSizeModeChanged,
&aSizeMode);
}
MediaFeatureValuesChangedAllDocuments(
{MediaFeatureChangeReason::SizeModeChange});
}
nsCompatibility nsPresContext::CompatibilityMode() const {
return Document()->GetCompatibilityMode();
}
void nsPresContext::SetPaginatedScrolling(bool aPaginated) {
if (mType == eContext_PrintPreview || mType == eContext_PageLayout)
mCanPaginatedScroll = aPaginated;
}
void nsPresContext::SetPrintSettings(nsIPrintSettings* aPrintSettings) {
if (mMedium == nsGkAtoms::print) mPrintSettings = aPrintSettings;
}
bool nsPresContext::EnsureVisible() {
nsCOMPtr<nsIDocShell> docShell(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 {
Element* elem = aFrame->GetContent()->AsElement();
// We need to handle non-generated content pseudos too, so we use
// the parent of generated content pseudo to be consistent.
if (elem->GetPseudoElementType() != PseudoStyleType::NotPseudo) {
MOZ_ASSERT(elem->GetParent(), "Pseudo element has no parent element?");
elem = elem->GetParent()->AsElement();
}
if (MOZ_UNLIKELY(!elem->HasServoData())) {
// Probably shouldn't happen, but does. See bug 1387953
return false;
}
// Anonymous boxes are more complicated, and we just assume that they
// cannot have any author-specified rules here.
if (aFrame->Style()->IsAnonBox()) {
return false;
}
auto* set = PresShell()->StyleSet()->RawSet();
return Servo_HasAuthorSpecifiedRules(set, aFrame->Style(), elem,
aRuleTypeMask);
}
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() {}
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 MayHavePaintEventListenerSubdocumentCallback(Document* aDocument,
void* aData) {
bool* result = static_cast<bool*>(aData);
nsPresContext* pc = aDocument->GetPresContext();
if (pc) {
*result = pc->MayHavePaintEventListenerInSubDocument();
// If we found a paint event listener, then we can stop enumerating
// sub documents.
return !*result;
}
return true;
}
static bool MayHavePaintEventListener(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* tabChildGlobal;
return root && (tabChildGlobal = root->GetParentTarget()) &&
(manager = tabChildGlobal->GetExistingListenerManager()) &&
manager->MayHavePaintEventListener();
}
bool nsPresContext::MayHavePaintEventListener() {
return ::MayHavePaintEventListener(mDocument->GetInnerWindow());
}
bool nsPresContext::MayHavePaintEventListenerInSubDocument() {
if (MayHavePaintEventListener()) {
return true;
}
bool result = false;
mDocument->EnumerateSubDocuments(MayHavePaintEventListenerSubdocumentCallback,
&result);
return result;
}
void nsPresContext::NotifyInvalidation(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);
}
struct NotifyDidPaintSubdocumentCallbackClosure {
TransactionId mTransactionId;
const mozilla::TimeStamp& mTimeStamp;
};
bool nsPresContext::NotifyDidPaintSubdocumentCallback(dom::Document* aDocument,
void* aData) {
NotifyDidPaintSubdocumentCallbackClosure* closure =
static_cast<NotifyDidPaintSubdocumentCallbackClosure*>(aData);
nsPresContext* pc = aDocument->GetPresContext();
if (pc) {
pc->NotifyDidPaintForSubtree(closure->mTransactionId, closure->mTimeStamp);
}
return true;
}
bool nsPresContext::NotifyRevokingDidPaintSubdocumentCallback(
dom::Document* aDocument, void* aData) {
NotifyDidPaintSubdocumentCallbackClosure* closure =
static_cast<NotifyDidPaintSubdocumentCallbackClosure*>(aData);
nsPresContext* pc = aDocument->GetPresContext();
if (pc) {
pc->NotifyRevokingDidPaint(closure->mTransactionId);
}
return true;
}
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) {
MOZ_ASSERT(mPresContext->GetContainerWeak(),
"DOMPaintEvent requested for a detached pres context");
mList.SwapElements(*aList);
}
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, &transaction->mInvalidations, transaction->mTransactionId,
mozilla::TimeStamp());
nsContentUtils::AddScriptRunner(ev);
mTransactions.RemoveElementAt(0);
} else {
transaction->mIsWaitingForPreviousTransaction = true;
}
NotifyDidPaintSubdocumentCallbackClosure closure = {aTransactionId,
mozilla::TimeStamp()};
mDocument->EnumerateSubDocuments(
nsPresContext::NotifyRevokingDidPaintSubdocumentCallback, &closure);
}
void nsPresContext::NotifyDidPaintForSubtree(
TransactionId aTransactionId, const mozilla::TimeStamp& aTimeStamp) {
if (mFirstContentfulPaintTransactionId && !mHadContentfulPaintComposite) {
if (aTransactionId >= *mFirstContentfulPaintTransactionId) {
mHadContentfulPaintComposite = true;
RefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
if (timing) {
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, &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, &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, &dummy, aTransactionId, aTimeStamp);
nsContentUtils::AddScriptRunner(ev);
}
NotifyDidPaintSubdocumentCallbackClosure closure = {aTransactionId,
aTimeStamp};
mDocument->EnumerateSubDocuments(
nsPresContext::NotifyDidPaintSubdocumentCallback, &closure);
}
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() &&
nsLayoutUtils::InterruptibleReflowEnabled();
// Don't set mHasPendingInterrupt based on HavePendingInputEvent() here. If
// we ever change that, then we need to update the code in
// PresShell::DoReflow to only add the just-reflown root to dirty roots if
// it's actually dirty. Otherwise we can end up adding a root that has no
// interruptible descendants, just because we detected an interrupt at reflow
// start.
mHasPendingInterrupt = false;
mInterruptChecksToSkip = sInterruptChecksToSkip;
if (mInterruptsEnabled) {
mReflowStartTime = TimeStamp::Now();
}
}
bool nsPresContext::CheckForInterrupt(nsIFrame* aFrame) {
if (mHasPendingInterrupt) {
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 {
// We are a root content document if: we are not a resource doc, we are
// not chrome, and we either have no parent or our parent is chrome.
if (mDocument->IsResourceDoc()) {
return false;
}
if (IsChrome()) {
return false;
}
// We may not have a root frame, so use views.
nsView* view = PresShell()->GetViewManager()->GetRootView();
if (!view) {
return false;
}
view = view->GetParent(); // anonymous inner view
if (!view) {
return true;
}
view = view->GetParent(); // subdocumentframe's view
if (!view) {
return true;
}
nsIFrame* f = view->GetFrame();
return (f && f->PresContext()->IsChrome());
}
void nsPresContext::NotifyNonBlankPaint() {
MOZ_ASSERT(!mHadNonBlankPaint);
mHadNonBlankPaint = true;
if (IsRootContentDocument()) {
RefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
if (timing) {
timing->NotifyNonBlankPaintForRootContentDocument();
}
mFirstNonBlankPaintTime = TimeStamp::Now();
}
}
void nsPresContext::NotifyContentfulPaint() {
if (!mHadContentfulPaint) {
mHadContentfulPaint = true;
if (IsRootContentDocument()) {
if (nsRootPresContext* rootPresContext = GetRootPresContext()) {
mFirstContentfulPaintTransactionId =
Some(rootPresContext->mRefreshDriver->LastTransactionId().Next());
}
}
}
}
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;
}
}
#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();
}
/* virtual */
void nsRootPresContext::Detach() {
// XXXmats maybe also CancelApplyPluginGeometryTimer(); ?
nsPresContext::Detach();
}
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->GetVisualOverflowRectRelativeToSelf();
// 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 nsPresShell::WillPaintWindow or from
// nsPresShell::DidPaintWindow, depending on the platform). But paints might
// get optimized away if the old plugin geometry covers the invalid region,
// so set a backup timer to do this too. We want to make sure this
// won't fire before our normal paint notifications, if those would
// update the geometry, so set it for double the refresh driver interval.
mApplyPluginGeometryTimer = 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;
pluginsToMove.SwapElements(*aConfigurations);
// Our algorithm is quite naive. At each step we try to identify
// a window that can be moved to its new location that won't overlap
// any other windows at the new location. If there is no such
// window, we just move the last window in the list anyway.
while (!pluginsToMove.IsEmpty()) {
// Find a window whose destination does not overlap any other window
uint32_t i;
for (i = 0; i + 1 < pluginsToMove.Length(); ++i) {
nsIWidget::Configuration* config = &pluginsToMove[i];
bool foundOverlap = false;
for (uint32_t j = 0; j < pluginsToMove.Length(); ++j) {
if (i == j) continue;
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;
observers.SwapElements(mWillPaintObservers);
for (uint32_t i = 0; i < observers.Length(); ++i) {
observers[i]->Run();
}
}
size_t nsRootPresContext::SizeOfExcludingThis(
MallocSizeOf aMallocSizeOf) const {
return nsPresContext::SizeOfExcludingThis(aMallocSizeOf);
// Measurement of the following members may be added later if DMD finds it is
// worthwhile:
// - mRegisteredPlugins
// - mWillPaintObservers
// - mWillPaintFallbackEvent
}