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-rw-r--r--layout/base/nsPresContext.cpp3159
1 files changed, 3159 insertions, 0 deletions
diff --git a/layout/base/nsPresContext.cpp b/layout/base/nsPresContext.cpp
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+++ b/layout/base/nsPresContext.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/* a presentation of a document, part 1 */
+
+#include "mozilla/ArrayUtils.h"
+#include "mozilla/DebugOnly.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStateManager.h"
+
+#include "base/basictypes.h"
+
+#include "nsCOMPtr.h"
+#include "nsPresContext.h"
+#include "nsIPresShell.h"
+#include "nsDocShell.h"
+#include "nsIContentViewer.h"
+#include "nsPIDOMWindow.h"
+#include "mozilla/StyleSetHandle.h"
+#include "mozilla/StyleSetHandleInlines.h"
+#include "nsIContent.h"
+#include "nsIFrame.h"
+#include "nsIDocument.h"
+#include "nsIPrintSettings.h"
+#include "nsILanguageAtomService.h"
+#include "mozilla/LookAndFeel.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsIDOMHTMLDocument.h"
+#include "nsIDOMHTMLElement.h"
+#include "nsIWeakReferenceUtils.h"
+#include "nsThreadUtils.h"
+#include "nsFrameManager.h"
+#include "nsLayoutUtils.h"
+#include "nsViewManager.h"
+#include "mozilla/RestyleManager.h"
+#include "mozilla/RestyleManagerHandle.h"
+#include "mozilla/RestyleManagerHandleInlines.h"
+#include "SurfaceCacheUtils.h"
+#include "nsCSSRuleProcessor.h"
+#include "nsRuleNode.h"
+#include "gfxPlatform.h"
+#include "nsCSSRules.h"
+#include "nsFontFaceLoader.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/MediaQueryList.h"
+#include "nsSMILAnimationController.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 "mozilla/dom/FontFaceSet.h"
+#include "nsContentUtils.h"
+#include "nsPIWindowRoot.h"
+#include "mozilla/Preferences.h"
+#include "gfxTextRun.h"
+#include "nsFontFaceUtils.h"
+#include "nsLayoutStylesheetCache.h"
+#include "mozilla/StyleSheet.h"
+#include "mozilla/StyleSheetInlines.h"
+
+#if defined(MOZ_WIDGET_GTK)
+#include "gfxPlatformGtk.h" // xxx - for UseFcFontList
+#endif
+
+
+// Needed for Start/Stop of Image Animation
+#include "imgIContainer.h"
+#include "nsIImageLoadingContent.h"
+
+#include "nsCSSParser.h"
+#include "nsBidiUtils.h"
+#include "nsServiceManagerUtils.h"
+
+#include "mozilla/dom/URL.h"
+
+using namespace mozilla;
+using namespace mozilla::dom;
+using namespace mozilla::layers;
+
+uint8_t gNotifySubDocInvalidationData;
+
+/**
+ * Layer UserData for ContainerLayers that want to be notified
+ * of local invalidations of them and their descendant layers.
+ * Pass a callback to ComputeDifferences to have these called.
+ */
+class ContainerLayerPresContext : public LayerUserData {
+public:
+ nsPresContext* mPresContext;
+};
+
+namespace {
+
+class CharSetChangingRunnable : public Runnable
+{
+public:
+ CharSetChangingRunnable(nsPresContext* aPresContext,
+ const nsCString& aCharSet)
+ : mPresContext(aPresContext),
+ mCharSet(aCharSet)
+ {
+ }
+
+ NS_IMETHOD Run() override
+ {
+ mPresContext->DoChangeCharSet(mCharSet);
+ return NS_OK;
+ }
+
+private:
+ RefPtr<nsPresContext> mPresContext;
+ nsCString mCharSet;
+};
+
+} // namespace
+
+nscolor
+nsPresContext::MakeColorPref(const nsString& aColor)
+{
+ nsCSSParser parser;
+ nsCSSValue value;
+ if (!parser.ParseColorString(aColor, nullptr, 0, value)) {
+ // Any better choices?
+ return NS_RGB(0, 0, 0);
+ }
+
+ nscolor color;
+ return nsRuleNode::ComputeColor(value, this, nullptr, color)
+ ? color
+ : NS_RGB(0, 0, 0);
+}
+
+bool
+nsPresContext::IsDOMPaintEventPending()
+{
+ if (mFireAfterPaintEvents) {
+ return true;
+ }
+ 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(nsRect(0, 0, 0, 0), 0);
+ NS_ASSERTION(mFireAfterPaintEvents, "Why aren't we planning to fire the event?");
+ return true;
+ }
+ return false;
+}
+
+void
+nsPresContext::PrefChangedCallback(const char* aPrefName, void* instance_data)
+{
+ RefPtr<nsPresContext> presContext =
+ static_cast<nsPresContext*>(instance_data);
+
+ NS_ASSERTION(nullptr != presContext, "bad instance data");
+ if (nullptr != presContext) {
+ presContext->PreferenceChanged(aPrefName);
+ }
+}
+
+void
+nsPresContext::PrefChangedUpdateTimerCallback(nsITimer *aTimer, void *aClosure)
+{
+ nsPresContext* presContext = (nsPresContext*)aClosure;
+ NS_ASSERTION(presContext != nullptr, "bad instance data");
+ if (presContext)
+ presContext->UpdateAfterPreferencesChanged();
+}
+
+static bool
+IsVisualCharset(const nsCString& aCharset)
+{
+ if (aCharset.LowerCaseEqualsLiteral("ibm862") // Hebrew
+ || aCharset.LowerCaseEqualsLiteral("iso-8859-8") ) { // Hebrew
+ return true; // visual text type
+ }
+ else {
+ return false; // logical text type
+ }
+}
+
+ // NOTE! nsPresContext::operator new() zeroes out all members, so don't
+ // bother initializing members to 0.
+
+nsPresContext::nsPresContext(nsIDocument* aDocument, nsPresContextType aType)
+ : mType(aType), mDocument(aDocument), mBaseMinFontSize(0),
+ mTextZoom(1.0), mFullZoom(1.0), mOverrideDPPX(0.0),
+ mLastFontInflationScreenSize(gfxSize(-1.0, -1.0)),
+ mPageSize(-1, -1), mPPScale(1.0f),
+ mViewportStyleScrollbar(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO),
+ mImageAnimationModePref(imgIContainer::kNormalAnimMode),
+ mAllInvalidated(false),
+ mPaintFlashing(false), mPaintFlashingInitialized(false)
+{
+ // NOTE! nsPresContext::operator new() zeroes out all members, so don't
+ // bother initializing members to 0.
+
+ mDoScaledTwips = true;
+
+ SetBackgroundImageDraw(true); // always draw the background
+ SetBackgroundColorDraw(true);
+
+ mBackgroundColor = NS_RGB(0xFF, 0xFF, 0xFF);
+
+ mUseDocumentColors = true;
+ mUseDocumentFonts = true;
+
+ // the minimum font-size is unconstrained by default
+
+ mLinkColor = NS_RGB(0x00, 0x00, 0xEE);
+ mActiveLinkColor = NS_RGB(0xEE, 0x00, 0x00);
+ mVisitedLinkColor = NS_RGB(0x55, 0x1A, 0x8B);
+ mUnderlineLinks = true;
+ mSendAfterPaintToContent = false;
+
+ mFocusTextColor = mDefaultColor;
+ mFocusBackgroundColor = mBackgroundColor;
+ mFocusRingWidth = 1;
+
+ mBodyTextColor = mDefaultColor;
+
+ if (aType == eContext_Galley) {
+ mMedium = nsGkAtoms::screen;
+ } else {
+ mMedium = nsGkAtoms::print;
+ mPaginated = true;
+ }
+ mMediaEmulated = mMedium;
+
+ if (!IsDynamic()) {
+ mImageAnimationMode = imgIContainer::kDontAnimMode;
+ mNeverAnimate = true;
+ } else {
+ mImageAnimationMode = imgIContainer::kNormalAnimMode;
+ mNeverAnimate = false;
+ }
+ NS_ASSERTION(mDocument, "Null document");
+
+ mCounterStylesDirty = true;
+
+ // if text perf logging enabled, init stats struct
+ if (MOZ_LOG_TEST(gfxPlatform::GetLog(eGfxLog_textperf), LogLevel::Warning)) {
+ mTextPerf = new gfxTextPerfMetrics();
+ }
+
+ if (Preferences::GetBool(GFX_MISSING_FONTS_NOTIFY_PREF)) {
+ mMissingFonts = new gfxMissingFontRecorder();
+ }
+}
+
+void
+nsPresContext::Destroy()
+{
+ if (mEventManager) {
+ // unclear if these are needed, but can't hurt
+ mEventManager->NotifyDestroyPresContext(this);
+ mEventManager->SetPresContext(nullptr);
+ mEventManager = nullptr;
+ }
+
+ if (mPrefChangedTimer)
+ {
+ mPrefChangedTimer->Cancel();
+ mPrefChangedTimer = nullptr;
+ }
+
+ // Unregister preference callbacks
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "font.",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.display.",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.underline_anchors",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.anchor_color",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.active_color",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.visited_color",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "image.animation_mode",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "bidi.",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "dom.send_after_paint_to_content",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "gfx.font_rendering.",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "layout.css.dpi",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "layout.css.devPixelsPerPx",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "nglayout.debug.paint_flashing",
+ this);
+ Preferences::UnregisterCallback(nsPresContext::PrefChangedCallback,
+ "nglayout.debug.paint_flashing_chrome",
+ this);
+
+ mRefreshDriver = nullptr;
+}
+
+nsPresContext::~nsPresContext()
+{
+ NS_PRECONDITION(!mShell, "Presshell forgot to clear our mShell pointer");
+ DetachShell();
+
+ Destroy();
+}
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(nsPresContext)
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+ NS_INTERFACE_MAP_ENTRY(nsIObserver)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(nsPresContext)
+NS_IMPL_CYCLE_COLLECTING_RELEASE_WITH_LAST_RELEASE(nsPresContext, LastRelease())
+
+void
+nsPresContext::LastRelease()
+{
+ if (IsRoot()) {
+ static_cast<nsRootPresContext*>(this)->CancelDidPaintTimer();
+ }
+ if (mMissingFonts) {
+ mMissingFonts->Clear();
+ }
+}
+
+NS_IMPL_CYCLE_COLLECTION_CLASS(nsPresContext)
+
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(nsPresContext)
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mAnimationManager);
+ 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(mLangService); // a service
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrintSettings);
+ NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPrefChangedTimer);
+NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
+
+NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(nsPresContext)
+ NS_IMPL_CYCLE_COLLECTION_UNLINK(mAnimationManager);
+ 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(mLangService); // 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;
+
+void
+nsPresContext::GetDocumentColorPreferences()
+{
+ // Make sure the preferences are initialized. In the normal run,
+ // they would already be, because gfxPlatform would have been created,
+ // but in some reference tests, that is not the case.
+ gfxPrefs::GetSingleton();
+
+ int32_t useAccessibilityTheme = 0;
+ bool usePrefColors = true;
+ bool isChromeDocShell = false;
+ static int32_t sDocumentColorsSetting;
+ static bool sDocumentColorsSettingPrefCached = false;
+ if (!sDocumentColorsSettingPrefCached) {
+ sDocumentColorsSettingPrefCached = true;
+ Preferences::AddIntVarCache(&sDocumentColorsSetting,
+ "browser.display.document_color_use",
+ 0);
+ }
+
+ nsIDocument* doc = mDocument->GetDisplayDocument();
+ if (doc && doc->GetDocShell()) {
+ isChromeDocShell = nsIDocShellTreeItem::typeChrome ==
+ doc->GetDocShell()->ItemType();
+ } else {
+ nsCOMPtr<nsIDocShellTreeItem> docShell(mContainer);
+ if (docShell) {
+ isChromeDocShell = nsIDocShellTreeItem::typeChrome == docShell->ItemType();
+ }
+ }
+
+ mIsChromeOriginImage = mDocument->IsBeingUsedAsImage() &&
+ IsChromeURI(mDocument->GetDocumentURI());
+
+ if (isChromeDocShell || mIsChromeOriginImage) {
+ usePrefColors = false;
+ } else {
+ useAccessibilityTheme =
+ LookAndFeel::GetInt(LookAndFeel::eIntID_UseAccessibilityTheme, 0);
+ usePrefColors = !useAccessibilityTheme;
+ }
+ if (usePrefColors) {
+ usePrefColors =
+ !Preferences::GetBool("browser.display.use_system_colors", false);
+ }
+
+ if (usePrefColors) {
+ nsAdoptingString colorStr =
+ Preferences::GetString("browser.display.foreground_color");
+
+ if (!colorStr.IsEmpty()) {
+ mDefaultColor = MakeColorPref(colorStr);
+ }
+
+ colorStr = Preferences::GetString("browser.display.background_color");
+
+ if (!colorStr.IsEmpty()) {
+ mBackgroundColor = MakeColorPref(colorStr);
+ }
+ }
+ else {
+ mDefaultColor =
+ LookAndFeel::GetColor(LookAndFeel::eColorID_WindowForeground,
+ NS_RGB(0x00, 0x00, 0x00));
+ mBackgroundColor =
+ LookAndFeel::GetColor(LookAndFeel::eColorID_WindowBackground,
+ NS_RGB(0xFF, 0xFF, 0xFF));
+ }
+
+ // Wherever we got the default background color from, ensure it is
+ // opaque.
+ mBackgroundColor = NS_ComposeColors(NS_RGB(0xFF, 0xFF, 0xFF),
+ mBackgroundColor);
+
+
+ // Now deal with the pref:
+ // 0 = default: always, except in high contrast mode
+ // 1 = always
+ // 2 = never
+ if (sDocumentColorsSetting == 1 || mDocument->IsBeingUsedAsImage()) {
+ mUseDocumentColors = true;
+ } else if (sDocumentColorsSetting == 2) {
+ mUseDocumentColors = isChromeDocShell || mIsChromeOriginImage;
+ } else {
+ MOZ_ASSERT(!useAccessibilityTheme ||
+ !(isChromeDocShell || mIsChromeOriginImage),
+ "The accessibility theme should only be on for non-chrome");
+ mUseDocumentColors = !useAccessibilityTheme;
+ }
+}
+
+void
+nsPresContext::GetUserPreferences()
+{
+ if (!GetPresShell()) {
+ // No presshell means nothing to do here. We'll do this when we
+ // get a presshell.
+ return;
+ }
+
+ mAutoQualityMinFontSizePixelsPref =
+ Preferences::GetInt("browser.display.auto_quality_min_font_size");
+
+ // * document colors
+ GetDocumentColorPreferences();
+
+ mSendAfterPaintToContent =
+ Preferences::GetBool("dom.send_after_paint_to_content",
+ mSendAfterPaintToContent);
+
+ // * link colors
+ mUnderlineLinks =
+ Preferences::GetBool("browser.underline_anchors", mUnderlineLinks);
+
+ nsAdoptingString colorStr = Preferences::GetString("browser.anchor_color");
+
+ if (!colorStr.IsEmpty()) {
+ mLinkColor = MakeColorPref(colorStr);
+ }
+
+ colorStr = Preferences::GetString("browser.active_color");
+
+ if (!colorStr.IsEmpty()) {
+ mActiveLinkColor = MakeColorPref(colorStr);
+ }
+
+ colorStr = Preferences::GetString("browser.visited_color");
+
+ if (!colorStr.IsEmpty()) {
+ mVisitedLinkColor = MakeColorPref(colorStr);
+ }
+
+ mUseFocusColors =
+ Preferences::GetBool("browser.display.use_focus_colors", mUseFocusColors);
+
+ mFocusTextColor = mDefaultColor;
+ mFocusBackgroundColor = mBackgroundColor;
+
+ colorStr = Preferences::GetString("browser.display.focus_text_color");
+
+ if (!colorStr.IsEmpty()) {
+ mFocusTextColor = MakeColorPref(colorStr);
+ }
+
+ colorStr = Preferences::GetString("browser.display.focus_background_color");
+
+ if (!colorStr.IsEmpty()) {
+ mFocusBackgroundColor = MakeColorPref(colorStr);
+ }
+
+ mFocusRingWidth =
+ Preferences::GetInt("browser.display.focus_ring_width", mFocusRingWidth);
+
+ mFocusRingOnAnything =
+ Preferences::GetBool("browser.display.focus_ring_on_anything",
+ mFocusRingOnAnything);
+
+ mFocusRingStyle =
+ Preferences::GetInt("browser.display.focus_ring_style", mFocusRingStyle);
+
+ mBodyTextColor = mDefaultColor;
+
+ // * use fonts?
+ mUseDocumentFonts =
+ Preferences::GetInt("browser.display.use_document_fonts") != 0;
+
+ mPrefScrollbarSide = Preferences::GetInt("layout.scrollbar.side");
+
+ mLangGroupFontPrefs.Reset();
+ StaticPresData::Get()->ResetCachedFontPrefs();
+
+ // * image animation
+ const nsAdoptingCString& animatePref =
+ Preferences::GetCString("image.animation_mode");
+ 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, false);
+}
+
+void
+nsPresContext::InvalidatePaintedLayers()
+{
+ if (!mShell)
+ return;
+ nsIFrame* rootFrame = mShell->FrameManager()->GetRootFrame();
+ if (rootFrame) {
+ // FrameLayerBuilder caches invalidation-related values that depend on the
+ // appunits-per-dev-pixel ratio, so ensure that all PaintedLayer drawing
+ // is completely flushed.
+ rootFrame->InvalidateFrameSubtree();
+ }
+}
+
+void
+nsPresContext::AppUnitsPerDevPixelChanged()
+{
+ InvalidatePaintedLayers();
+
+ if (mDeviceContext) {
+ mDeviceContext->FlushFontCache();
+ }
+
+ if (HasCachedStyleData()) {
+ // All cached style data must be recomputed.
+ MediaFeatureValuesChanged(eRestyle_ForceDescendants, NS_STYLE_HINT_REFLOW);
+ }
+
+ mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
+}
+
+void
+nsPresContext::PreferenceChanged(const char* aPrefName)
+{
+ nsDependentCString prefName(aPrefName);
+ if (prefName.EqualsLiteral("layout.css.dpi") ||
+ prefName.EqualsLiteral("layout.css.devPixelsPerPx")) {
+ int32_t oldAppUnitsPerDevPixel = AppUnitsPerDevPixel();
+ if (mDeviceContext->CheckDPIChange() && mShell) {
+ nsCOMPtr<nsIPresShell> shell = mShell;
+ // Re-fetch the view manager's window dimensions in case there's a deferred
+ // resize which hasn't affected our mVisibleArea yet
+ nscoord oldWidthAppUnits, oldHeightAppUnits;
+ RefPtr<nsViewManager> vm = shell->GetViewManager();
+ if (!vm) {
+ return;
+ }
+ vm->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
+ float oldWidthDevPixels = oldWidthAppUnits/oldAppUnitsPerDevPixel;
+ float oldHeightDevPixels = oldHeightAppUnits/oldAppUnitsPerDevPixel;
+
+ nscoord width = NSToCoordRound(oldWidthDevPixels*AppUnitsPerDevPixel());
+ nscoord height = NSToCoordRound(oldHeightDevPixels*AppUnitsPerDevPixel());
+ vm->SetWindowDimensions(width, height);
+
+ AppUnitsPerDevPixelChanged();
+ }
+ return;
+ }
+ if (prefName.EqualsLiteral(GFX_MISSING_FONTS_NOTIFY_PREF)) {
+ if (Preferences::GetBool(GFX_MISSING_FONTS_NOTIFY_PREF)) {
+ if (!mMissingFonts) {
+ mMissingFonts = new 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."))) {
+ // Changes to font family preferences don't change anything in the
+ // computed style data, so the style system won't generate a reflow
+ // hint for us. We need to do that manually.
+
+ // FIXME We could probably also handle changes to
+ // browser.display.auto_quality_min_font_size here, but that
+ // probably also requires clearing the text run cache, so don't
+ // bother (yet, anyway).
+ mPrefChangePendingNeedsReflow = true;
+ }
+ if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("bidi."))) {
+ // Changes to bidi prefs need to trigger a reflow (see bug 443629)
+ mPrefChangePendingNeedsReflow = true;
+
+ // Changes to bidi.numeral also needs to empty the text run cache.
+ // This is handled in gfxTextRunWordCache.cpp.
+ }
+ if (StringBeginsWith(prefName, NS_LITERAL_CSTRING("gfx.font_rendering."))) {
+ // Changes to font_rendering prefs need to trigger a reflow
+ mPrefChangePendingNeedsReflow = true;
+ }
+ // we use a zero-delay timer to coalesce multiple pref updates
+ if (!mPrefChangedTimer)
+ {
+ // 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 mPrefChangedTimer called will
+ // be the one to cause the reconstruction of the pref style sheet.
+ nsLayoutStylesheetCache::InvalidatePreferenceSheets();
+ mPrefChangedTimer = CreateTimer(PrefChangedUpdateTimerCallback, 0);
+ if (!mPrefChangedTimer) {
+ return;
+ }
+ }
+ if (prefName.EqualsLiteral("nglayout.debug.paint_flashing") ||
+ prefName.EqualsLiteral("nglayout.debug.paint_flashing_chrome")) {
+ mPaintFlashingInitialized = false;
+ return;
+ }
+}
+
+void
+nsPresContext::UpdateAfterPreferencesChanged()
+{
+ mPrefChangedTimer = nullptr;
+
+ if (!mContainer) {
+ // Delay updating until there is a container
+ mNeedsPrefUpdate = true;
+ return;
+ }
+
+ nsCOMPtr<nsIDocShellTreeItem> docShell(mContainer);
+ if (docShell && nsIDocShellTreeItem::typeChrome == docShell->ItemType()) {
+ return;
+ }
+
+ // Initialize our state from the user preferences
+ GetUserPreferences();
+
+ // update the presShell: tell it to set the preference style rules up
+ if (mShell) {
+ mShell->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, eRestyle_Subtree);
+}
+
+nsresult
+nsPresContext::Init(nsDeviceContext* aDeviceContext)
+{
+ NS_ASSERTION(!mInitialized, "attempt to reinit pres context");
+ NS_ENSURE_ARG(aDeviceContext);
+
+ mDeviceContext = aDeviceContext;
+
+ if (mDeviceContext->SetFullZoom(mFullZoom))
+ mDeviceContext->FlushFontCache();
+ mCurAppUnitsPerDevPixel = AppUnitsPerDevPixel();
+
+ mEventManager = new mozilla::EventStateManager();
+
+ mEffectCompositor = new mozilla::EffectCompositor(this);
+ mTransitionManager = new nsTransitionManager(this);
+ mAnimationManager = new nsAnimationManager(this);
+
+ if (mDocument->GetDisplayDocument()) {
+ NS_ASSERTION(mDocument->GetDisplayDocument()->GetShell() &&
+ mDocument->GetDisplayDocument()->GetShell()->GetPresContext(),
+ "Why are we being initialized?");
+ mRefreshDriver = mDocument->GetDisplayDocument()->GetShell()->
+ GetPresContext()->RefreshDriver();
+ } else {
+ nsIDocument* parent = mDocument->GetParentDocument();
+ // Unfortunately, sometimes |parent| here has no presshell because
+ // printing screws up things. Assert that in other cases it does,
+ // but whenever the shell is null just fall back on using our own
+ // refresh driver.
+ NS_ASSERTION(!parent || mDocument->IsStaticDocument() || parent->GetShell(),
+ "How did we end up with a presshell if our parent doesn't "
+ "have one?");
+ if (parent && parent->GetShell()) {
+ NS_ASSERTION(parent->GetShell()->GetPresContext(),
+ "How did we get a presshell?");
+
+ // We don't have our container set yet at this point
+ nsCOMPtr<nsIDocShellTreeItem> ourItem = mDocument->GetDocShell();
+ if (ourItem) {
+ nsCOMPtr<nsIDocShellTreeItem> parentItem;
+ ourItem->GetSameTypeParent(getter_AddRefs(parentItem));
+ if (parentItem) {
+ Element* containingElement =
+ parent->FindContentForSubDocument(mDocument);
+ if (!containingElement->IsXULElement() ||
+ !containingElement->
+ HasAttr(kNameSpaceID_None,
+ nsGkAtoms::forceOwnRefreshDriver)) {
+ mRefreshDriver = parent->GetShell()->GetPresContext()->RefreshDriver();
+ }
+ }
+ }
+ }
+
+ if (!mRefreshDriver) {
+ mRefreshDriver = new nsRefreshDriver(this);
+ }
+ }
+
+ mLangService = do_GetService(NS_LANGUAGEATOMSERVICE_CONTRACTID);
+
+ // Register callbacks so we're notified when the preferences change
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "font.",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.display.",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.underline_anchors",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.anchor_color",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.active_color",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "browser.visited_color",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "image.animation_mode",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "bidi.",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "dom.send_after_paint_to_content",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "gfx.font_rendering.",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "layout.css.dpi",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "layout.css.devPixelsPerPx",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "nglayout.debug.paint_flashing",
+ this);
+ Preferences::RegisterCallback(nsPresContext::PrefChangedCallback,
+ "nglayout.debug.paint_flashing_chrome",
+ this);
+
+ nsresult rv = mEventManager->Init();
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ mEventManager->SetPresContext(this);
+
+#ifdef RESTYLE_LOGGING
+ mRestyleLoggingEnabled = RestyleManager::RestyleLoggingInitiallyEnabled();
+#endif
+
+#ifdef DEBUG
+ mInitialized = true;
+#endif
+
+ mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THIN] = CSSPixelsToAppUnits(1);
+ mBorderWidthTable[NS_STYLE_BORDER_WIDTH_MEDIUM] = CSSPixelsToAppUnits(3);
+ mBorderWidthTable[NS_STYLE_BORDER_WIDTH_THICK] = CSSPixelsToAppUnits(5);
+
+ return NS_OK;
+}
+
+// Note: We don't hold a reference on the shell; it has a reference to
+// us
+void
+nsPresContext::AttachShell(nsIPresShell* aShell, StyleBackendType aBackendType)
+{
+ MOZ_ASSERT(!mShell);
+ mShell = aShell;
+
+ if (aBackendType == StyleBackendType::Servo) {
+ mRestyleManager = new ServoRestyleManager(this);
+ } else {
+ // Since RestyleManager is also the name of a method of nsPresContext,
+ // it is necessary to prefix the class with the mozilla namespace
+ // here.
+ mRestyleManager = new 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);
+
+ nsIDocument *doc = mShell->GetDocument();
+ NS_ASSERTION(doc, "expect document here");
+ if (doc) {
+ // Have to update PresContext's mDocument before calling any other methods.
+ mDocument = doc;
+ }
+ // Initialize our state from the user preferences, now that we
+ // have a presshell, and hence a document.
+ GetUserPreferences();
+
+ if (doc) {
+ nsIURI *docURI = doc->GetDocumentURI();
+
+ if (IsDynamic() && docURI) {
+ bool isChrome = false;
+ bool isRes = false;
+ docURI->SchemeIs("chrome", &isChrome);
+ docURI->SchemeIs("resource", &isRes);
+
+ if (!isChrome && !isRes)
+ mImageAnimationMode = mImageAnimationModePref;
+ else
+ mImageAnimationMode = imgIContainer::kNormalAnimMode;
+ }
+
+ if (mLangService) {
+ doc->AddCharSetObserver(this);
+ UpdateCharSet(doc->GetDocumentCharacterSet());
+ }
+ }
+}
+
+void
+nsPresContext::DetachShell()
+{
+ // Remove ourselves as the charset observer from the shell's doc, because
+ // this shell may be going away for good.
+ nsIDocument *doc = mShell ? mShell->GetDocument() : nullptr;
+ if (doc) {
+ doc->RemoveCharSetObserver(this);
+ }
+
+ // 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 mShell 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;
+ }
+
+ mShell = 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();
+
+ // The did-paint timer also depends on a non-null pres shell.
+ thisRoot->CancelDidPaintTimer();
+ }
+}
+
+void
+nsPresContext::DoChangeCharSet(const nsCString& aCharSet)
+{
+ UpdateCharSet(aCharSet);
+ mDeviceContext->FlushFontCache();
+ RebuildAllStyleData(NS_STYLE_HINT_REFLOW, nsRestyleHint(0));
+}
+
+void
+nsPresContext::UpdateCharSet(const nsCString& aCharSet)
+{
+ if (mLangService) {
+ mLanguage = mLangService->LookupCharSet(aCharSet);
+ // this will be a language group (or script) code rather than a true language code
+
+ // bug 39570: moved from nsLanguageAtomService::LookupCharSet()
+ if (mLanguage == nsGkAtoms::Unicode) {
+ mLanguage = mLangService->GetLocaleLanguage();
+ }
+ mLangGroupFontPrefs.Reset();
+ }
+
+ switch (GET_BIDI_OPTION_TEXTTYPE(GetBidi())) {
+
+ case IBMBIDI_TEXTTYPE_LOGICAL:
+ SetVisualMode(false);
+ break;
+
+ case IBMBIDI_TEXTTYPE_VISUAL:
+ SetVisualMode(true);
+ break;
+
+ case IBMBIDI_TEXTTYPE_CHARSET:
+ default:
+ SetVisualMode(IsVisualCharset(aCharSet));
+ }
+}
+
+NS_IMETHODIMP
+nsPresContext::Observe(nsISupports* aSubject,
+ const char* aTopic,
+ const char16_t* aData)
+{
+ if (!nsCRT::strcmp(aTopic, "charset")) {
+ RefPtr<CharSetChangingRunnable> runnable =
+ new CharSetChangingRunnable(this, NS_LossyConvertUTF16toASCII(aData));
+ return NS_DispatchToCurrentThread(runnable);
+ }
+
+ NS_WARNING("unrecognized topic in nsPresContext::Observe");
+ return NS_ERROR_FAILURE;
+}
+
+nsPresContext*
+nsPresContext::GetParentPresContext()
+{
+ nsIPresShell* shell = GetPresShell();
+ if (shell) {
+ nsViewManager* viewManager = shell->GetViewManager();
+ if (viewManager) {
+ nsView* view = viewManager->GetRootView();
+ if (view) {
+ view = view->GetParent(); // anonymous inner view
+ if (view) {
+ view = view->GetParent(); // subdocumentframe's view
+ if (view) {
+ nsIFrame* f = view->GetFrame();
+ if (f) {
+ return f->PresContext();
+ }
+ }
+ }
+ }
+ }
+ }
+ return nullptr;
+}
+
+nsPresContext*
+nsPresContext::GetToplevelContentDocumentPresContext()
+{
+ if (IsChrome())
+ return nullptr;
+ nsPresContext* pc = this;
+ for (;;) {
+ nsPresContext* parent = pc->GetParentPresContext();
+ if (!parent || parent->IsChrome())
+ return pc;
+ pc = parent;
+ }
+}
+
+nsIWidget*
+nsPresContext::GetNearestWidget(nsPoint* aOffset)
+{
+ NS_ENSURE_TRUE(mShell, nullptr);
+ nsIFrame* frame = mShell->GetRootFrame();
+ NS_ENSURE_TRUE(frame, nullptr);
+ return frame->GetView()->GetNearestWidget(aOffset);
+}
+
+nsIWidget*
+nsPresContext::GetRootWidget()
+{
+ NS_ENSURE_TRUE(mShell, nullptr);
+ nsViewManager* vm = mShell->GetViewManager();
+ if (!vm) {
+ return nullptr;
+ }
+ nsCOMPtr<nsIWidget> widget;
+ vm->GetRootWidget(getter_AddRefs(widget));
+ return widget.get();
+}
+
+// We may want to replace this with something faster, maybe caching the root prescontext
+nsRootPresContext*
+nsPresContext::GetRootPresContext()
+{
+ nsPresContext* pc = this;
+ for (;;) {
+ nsPresContext* parent = pc->GetParentPresContext();
+ if (!parent)
+ break;
+ pc = parent;
+ }
+ return pc->IsRoot() ? static_cast<nsRootPresContext*>(pc) : nullptr;
+}
+
+void
+nsPresContext::CompatibilityModeChanged()
+{
+ if (!mShell) {
+ return;
+ }
+
+ nsIDocument* doc = mShell->GetDocument();
+ if (!doc) {
+ return;
+ }
+
+ if (doc->IsSVGDocument()) {
+ // SVG documents never load quirk.css.
+ return;
+ }
+
+ bool needsQuirkSheet = CompatibilityMode() == eCompatibility_NavQuirks;
+ if (mQuirkSheetAdded == needsQuirkSheet) {
+ return;
+ }
+
+ StyleSetHandle styleSet = mShell->StyleSet();
+ auto cache = nsLayoutStylesheetCache::For(styleSet->BackendType());
+ StyleSheet* sheet = cache->QuirkSheet();
+
+ if (needsQuirkSheet) {
+ // quirk.css needs to come after html.css; we just keep it at the end.
+ DebugOnly<nsresult> rv =
+ styleSet->AppendStyleSheet(SheetType::Agent, sheet);
+ NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "failed to insert quirk.css");
+ } else {
+ DebugOnly<nsresult> rv =
+ styleSet->RemoveStyleSheet(SheetType::Agent, sheet);
+ NS_WARNING_ASSERTION(NS_SUCCEEDED(rv), "failed to remove quirk.css");
+ }
+
+ mQuirkSheetAdded = needsQuirkSheet;
+}
+
+// Helper function for setting Anim Mode on image
+static void SetImgAnimModeOnImgReq(imgIRequest* aImgReq, uint16_t aMode)
+{
+ if (aImgReq) {
+ nsCOMPtr<imgIContainer> imgCon;
+ aImgReq->GetImage(getter_AddRefs(imgCon));
+ if (imgCon) {
+ imgCon->SetAnimationMode(aMode);
+ }
+ }
+}
+
+// IMPORTANT: Assumption is that all images for a Presentation
+// have the same Animation Mode (pavlov said this was OK)
+//
+// Walks content and set the animation mode
+// this is a way to turn on/off image animations
+void nsPresContext::SetImgAnimations(nsIContent *aParent, uint16_t aMode)
+{
+ nsCOMPtr<nsIImageLoadingContent> imgContent(do_QueryInterface(aParent));
+ if (imgContent) {
+ nsCOMPtr<imgIRequest> imgReq;
+ imgContent->GetRequest(nsIImageLoadingContent::CURRENT_REQUEST,
+ getter_AddRefs(imgReq));
+ SetImgAnimModeOnImgReq(imgReq, aMode);
+ }
+
+ uint32_t count = aParent->GetChildCount();
+ for (uint32_t i = 0; i < count; ++i) {
+ SetImgAnimations(aParent->GetChildAt(i), aMode);
+ }
+}
+
+void
+nsPresContext::SetSMILAnimations(nsIDocument *aDoc, uint16_t aNewMode,
+ uint16_t aOldMode)
+{
+ if (aDoc->HasAnimationController()) {
+ nsSMILAnimationController* controller = aDoc->GetAnimationController();
+ switch (aNewMode)
+ {
+ case imgIContainer::kNormalAnimMode:
+ case imgIContainer::kLoopOnceAnimMode:
+ if (aOldMode == imgIContainer::kDontAnimMode)
+ controller->Resume(nsSMILTimeContainer::PAUSE_USERPREF);
+ break;
+
+ case imgIContainer::kDontAnimMode:
+ if (aOldMode != imgIContainer::kDontAnimMode)
+ controller->Pause(nsSMILTimeContainer::PAUSE_USERPREF);
+ break;
+ }
+ }
+}
+
+void
+nsPresContext::SetImageAnimationModeInternal(uint16_t aMode)
+{
+ NS_ASSERTION(aMode == imgIContainer::kNormalAnimMode ||
+ aMode == imgIContainer::kDontAnimMode ||
+ aMode == imgIContainer::kLoopOnceAnimMode, "Wrong Animation Mode is being set!");
+
+ // Image animation mode cannot be changed when rendering to a printer.
+ if (!IsDynamic())
+ return;
+
+ // Now walk the content tree and set the animation mode
+ // on all the images.
+ if (mShell != nullptr) {
+ nsIDocument *doc = mShell->GetDocument();
+ if (doc) {
+ doc->StyleImageLoader()->SetAnimationMode(aMode);
+
+ Element *rootElement = doc->GetRootElement();
+ if (rootElement) {
+ SetImgAnimations(rootElement, aMode);
+ }
+ SetSMILAnimations(doc, aMode, mImageAnimationMode);
+ }
+ }
+
+ mImageAnimationMode = aMode;
+}
+
+void
+nsPresContext::SetImageAnimationModeExternal(uint16_t aMode)
+{
+ SetImageAnimationModeInternal(aMode);
+}
+
+already_AddRefed<nsIAtom>
+nsPresContext::GetContentLanguage() const
+{
+ nsAutoString language;
+ Document()->GetContentLanguage(language);
+ language.StripWhitespace();
+
+ // Content-Language may be a comma-separated list of language codes,
+ // in which case the HTML5 spec says to treat it as unknown
+ if (!language.IsEmpty() &&
+ !language.Contains(char16_t(','))) {
+ return NS_Atomize(language);
+ // NOTE: This does *not* count as an explicit language; in other
+ // words, it doesn't trigger language-specific hyphenation.
+ }
+ return nullptr;
+}
+
+void
+nsPresContext::SetFullZoom(float aZoom)
+{
+ if (!mShell || mFullZoom == aZoom) {
+ return;
+ }
+
+ // Re-fetch the view manager's window dimensions in case there's a deferred
+ // resize which hasn't affected our mVisibleArea yet
+ nscoord oldWidthAppUnits, oldHeightAppUnits;
+ mShell->GetViewManager()->GetWindowDimensions(&oldWidthAppUnits, &oldHeightAppUnits);
+ float oldWidthDevPixels = oldWidthAppUnits / float(mCurAppUnitsPerDevPixel);
+ float oldHeightDevPixels = oldHeightAppUnits / float(mCurAppUnitsPerDevPixel);
+ mDeviceContext->SetFullZoom(aZoom);
+
+ NS_ASSERTION(!mSuppressResizeReflow, "two zooms happening at the same time? impossible!");
+ mSuppressResizeReflow = true;
+
+ mFullZoom = aZoom;
+ mShell->GetViewManager()->
+ SetWindowDimensions(NSToCoordRound(oldWidthDevPixels * AppUnitsPerDevPixel()),
+ NSToCoordRound(oldHeightDevPixels * AppUnitsPerDevPixel()));
+
+ AppUnitsPerDevPixelChanged();
+
+ mSuppressResizeReflow = false;
+}
+
+void
+nsPresContext::SetOverrideDPPX(float aDPPX)
+{
+ mOverrideDPPX = aDPPX;
+
+ if (HasCachedStyleData()) {
+ MediaFeatureValuesChanged(nsRestyleHint(0), nsChangeHint(0));
+ }
+}
+
+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 nsStyleDisplay* aDisplay, ScrollbarStyles* aStyles)
+{
+ if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_VISIBLE &&
+ aDisplay->mScrollBehavior == NS_STYLE_SCROLL_BEHAVIOR_AUTO &&
+ aDisplay->mScrollSnapTypeX == NS_STYLE_SCROLL_SNAP_TYPE_NONE &&
+ aDisplay->mScrollSnapTypeY == NS_STYLE_SCROLL_SNAP_TYPE_NONE &&
+ aDisplay->mScrollSnapPointsX == nsStyleCoord(eStyleUnit_None) &&
+ aDisplay->mScrollSnapPointsY == nsStyleCoord(eStyleUnit_None) &&
+ !aDisplay->mScrollSnapDestination.mXPosition.mHasPercent &&
+ !aDisplay->mScrollSnapDestination.mYPosition.mHasPercent &&
+ aDisplay->mScrollSnapDestination.mXPosition.mLength == 0 &&
+ aDisplay->mScrollSnapDestination.mYPosition.mLength == 0) {
+ return false;
+ }
+
+ if (aDisplay->mOverflowX == NS_STYLE_OVERFLOW_CLIP) {
+ *aStyles = ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN,
+ NS_STYLE_OVERFLOW_HIDDEN, aDisplay);
+ } else {
+ *aStyles = ScrollbarStyles(aDisplay);
+ }
+ return true;
+}
+
+static nsIContent*
+GetPropagatedScrollbarStylesForViewport(nsPresContext* aPresContext,
+ ScrollbarStyles *aStyles)
+{
+ nsIDocument* 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
+ StyleSetHandle styleSet = aPresContext->StyleSet();
+ RefPtr<nsStyleContext> rootStyle;
+ rootStyle = styleSet->ResolveStyleFor(docElement, nullptr);
+ if (CheckOverflow(rootStyle->StyleDisplay(), 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
+ // XXX what about XHTML?
+ nsCOMPtr<nsIDOMHTMLDocument> htmlDoc(do_QueryInterface(document));
+ if (!htmlDoc || !docElement->IsHTMLElement()) {
+ return nullptr;
+ }
+
+ nsCOMPtr<nsIDOMHTMLElement> body;
+ htmlDoc->GetBody(getter_AddRefs(body));
+ nsCOMPtr<nsIContent> bodyElement = do_QueryInterface(body);
+
+ if (!bodyElement ||
+ !bodyElement->NodeInfo()->Equals(nsGkAtoms::body)) {
+ // The body is not a <body> tag, it's a <frameset>.
+ return nullptr;
+ }
+
+ RefPtr<nsStyleContext> bodyStyle;
+ bodyStyle = styleSet->ResolveStyleFor(bodyElement->AsElement(), rootStyle);
+
+ if (CheckOverflow(bodyStyle->StyleDisplay(), aStyles)) {
+ // tell caller we stole the overflow style from the body element
+ return bodyElement;
+ }
+
+ return nullptr;
+}
+
+nsIContent*
+nsPresContext::UpdateViewportScrollbarStylesOverride()
+{
+ // Start off with our default styles, and then update them as needed.
+ mViewportStyleScrollbar = ScrollbarStyles(NS_STYLE_OVERFLOW_AUTO,
+ NS_STYLE_OVERFLOW_AUTO);
+ nsIContent* propagatedFrom = nullptr;
+ // Don't propagate the scrollbar state in printing or print preview.
+ if (!IsPaginated()) {
+ propagatedFrom =
+ GetPropagatedScrollbarStylesForViewport(this, &mViewportStyleScrollbar);
+ }
+
+ nsIDocument* 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 != propagatedFrom) {
+ mViewportStyleScrollbar = ScrollbarStyles(NS_STYLE_OVERFLOW_HIDDEN,
+ NS_STYLE_OVERFLOW_HIDDEN);
+ }
+ }
+
+ return propagatedFrom;
+}
+
+bool
+nsPresContext::ElementWouldPropagateScrollbarStyles(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 GetPropagatedScrollbarStylesForViewport, but update
+ // a dummy ScrollbarStyles 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.
+ ScrollbarStyles dummy(NS_STYLE_OVERFLOW_AUTO, NS_STYLE_OVERFLOW_AUTO);
+ return GetPropagatedScrollbarStylesForViewport(this, &dummy) == aElement;
+}
+
+void
+nsPresContext::SetContainer(nsIDocShell* aDocShell)
+{
+ if (aDocShell) {
+ NS_ASSERTION(!(mContainer && mNeedsPrefUpdate),
+ "Should only need pref update if mContainer is null.");
+ mContainer = static_cast<nsDocShell*>(aDocShell);
+ if (mNeedsPrefUpdate) {
+ if (!mPrefChangedTimer) {
+ mPrefChangedTimer = CreateTimer(PrefChangedUpdateTimerCallback, 0);
+ }
+ mNeedsPrefUpdate = false;
+ }
+ } else {
+ mContainer = WeakPtr<nsDocShell>();
+ }
+ UpdateIsChrome();
+ if (mContainer) {
+ GetDocumentColorPreferences();
+ }
+}
+
+nsISupports*
+nsPresContext::GetContainerWeakInternal() const
+{
+ return static_cast<nsIDocShell*>(mContainer);
+}
+
+nsISupports*
+nsPresContext::GetContainerWeakExternal() const
+{
+ return GetContainerWeakInternal();
+}
+
+nsIDocShell*
+nsPresContext::GetDocShell() const
+{
+ return mContainer;
+}
+
+/* virtual */ void
+nsPresContext::Detach()
+{
+ SetContainer(nullptr);
+ SetLinkHandler(nullptr);
+ if (mShell) {
+ mShell->CancelInvalidatePresShellIfHidden();
+ }
+}
+
+bool
+nsPresContext::BidiEnabledExternal() const
+{
+ return BidiEnabledInternal();
+}
+
+bool
+nsPresContext::BidiEnabledInternal() const
+{
+ return Document()->GetBidiEnabled();
+}
+
+void
+nsPresContext::SetBidiEnabled() const
+{
+ if (mShell) {
+ nsIDocument *doc = mShell->GetDocument();
+ if (doc) {
+ doc->SetBidiEnabled();
+ }
+ }
+}
+
+void
+nsPresContext::SetBidi(uint32_t aSource, bool aForceRestyle)
+{
+ // Don't do all this stuff unless the options have changed.
+ if (aSource == GetBidi()) {
+ return;
+ }
+
+ NS_ASSERTION(!(aForceRestyle && (GetBidi() == 0)),
+ "ForceReflow on new prescontext");
+
+ Document()->SetBidiOptions(aSource);
+ if (IBMBIDI_TEXTDIRECTION_RTL == GET_BIDI_OPTION_DIRECTION(aSource)
+ || IBMBIDI_NUMERAL_HINDI == GET_BIDI_OPTION_NUMERAL(aSource)) {
+ SetBidiEnabled();
+ }
+ if (IBMBIDI_TEXTTYPE_VISUAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
+ SetVisualMode(true);
+ }
+ else if (IBMBIDI_TEXTTYPE_LOGICAL == GET_BIDI_OPTION_TEXTTYPE(aSource)) {
+ SetVisualMode(false);
+ }
+ else {
+ nsIDocument* doc = mShell->GetDocument();
+ if (doc) {
+ SetVisualMode(IsVisualCharset(doc->GetDocumentCharacterSet()));
+ }
+ }
+ if (aForceRestyle && mShell) {
+ // Reconstruct the root document element's frame and its children,
+ // because we need to trigger frame reconstruction for direction change.
+ mDocument->RebuildUserFontSet();
+ mShell->ReconstructFrames();
+ }
+}
+
+uint32_t
+nsPresContext::GetBidi() const
+{
+ return Document()->GetBidiOptions();
+}
+
+bool
+nsPresContext::IsTopLevelWindowInactive()
+{
+ nsCOMPtr<nsIDocShellTreeItem> treeItem(mContainer);
+ if (!treeItem)
+ return false;
+
+ nsCOMPtr<nsIDocShellTreeItem> rootItem;
+ treeItem->GetRootTreeItem(getter_AddRefs(rootItem));
+ if (!rootItem) {
+ return false;
+ }
+
+ nsCOMPtr<nsPIDOMWindowOuter> domWindow = rootItem->GetWindow();
+
+ return domWindow && !domWindow->IsActive();
+}
+
+nsITheme*
+nsPresContext::GetTheme()
+{
+ if (!sNoTheme && !mTheme) {
+ mTheme = do_GetService("@mozilla.org/chrome/chrome-native-theme;1");
+ if (!mTheme)
+ sNoTheme = true;
+ }
+
+ return mTheme;
+}
+
+void
+nsPresContext::ThemeChanged()
+{
+ if (!mPendingThemeChanged) {
+ sLookAndFeelChanged = true;
+ sThemeChanged = true;
+
+ nsCOMPtr<nsIRunnable> ev =
+ NewRunnableMethod(this, &nsPresContext::ThemeChangedInternal);
+ if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+ 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();
+ }
+
+ // This will force the system metrics to be generated the next time they're used
+ nsCSSRuleProcessor::FreeSystemMetrics();
+
+ // Changes to system metrics can change media queries on them, or
+ // :-moz-system-metric selectors (which requires eRestyle_Subtree).
+ // Changes in theme can change system colors (whose changes are
+ // properly reflected in computed style data), system fonts (whose
+ // changes are not), and -moz-appearance (whose changes likewise are
+ // not), so we need to reflow.
+ MediaFeatureValuesChanged(eRestyle_Subtree, NS_STYLE_HINT_REFLOW);
+
+ // Recursively notify all remote leaf descendants that the
+ // system theme has changed.
+ nsContentUtils::CallOnAllRemoteChildren(mDocument->GetWindow(),
+ NotifyThemeChanged, nullptr);
+}
+
+void
+nsPresContext::SysColorChanged()
+{
+ if (!mPendingSysColorChanged) {
+ sLookAndFeelChanged = true;
+ nsCOMPtr<nsIRunnable> ev =
+ NewRunnableMethod(this, &nsPresContext::SysColorChangedInternal);
+ if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+ mPendingSysColorChanged = true;
+ }
+ }
+}
+
+void
+nsPresContext::SysColorChangedInternal()
+{
+ mPendingSysColorChanged = false;
+
+ if (sLookAndFeelChanged) {
+ // Don't use the cached values for the system colors
+ LookAndFeel::Refresh();
+ sLookAndFeelChanged = false;
+ }
+
+ // Reset default background and foreground colors for the document since
+ // they may be using system colors
+ GetDocumentColorPreferences();
+
+ // The system color values are computed to colors in the style data,
+ // so normal style data comparison is sufficient here.
+ RebuildAllStyleData(nsChangeHint(0), nsRestyleHint(0));
+}
+
+void
+nsPresContext::UIResolutionChanged()
+{
+ if (!mPendingUIResolutionChanged) {
+ nsCOMPtr<nsIRunnable> ev =
+ NewRunnableMethod(this, &nsPresContext::UIResolutionChangedInternal);
+ if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+ mPendingUIResolutionChanged = true;
+ }
+ }
+}
+
+void
+nsPresContext::UIResolutionChangedSync()
+{
+ if (!mPendingUIResolutionChanged) {
+ mPendingUIResolutionChanged = true;
+ UIResolutionChangedInternalScale(0.0);
+ }
+}
+
+/*static*/ bool
+nsPresContext::UIResolutionChangedSubdocumentCallback(nsIDocument* aDocument,
+ void* aData)
+{
+ nsIPresShell* shell = aDocument->GetShell();
+ if (shell) {
+ nsPresContext* pc = shell->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<nsIDocument> 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 != 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)
+{
+ nsIAtom* previousMedium = Medium();
+ mIsEmulatingMedia = true;
+
+ nsAutoString mediaType;
+ nsContentUtils::ASCIIToLower(aMediaType, mediaType);
+
+ mMediaEmulated = NS_Atomize(mediaType);
+ if (mMediaEmulated != previousMedium && mShell) {
+ MediaFeatureValuesChanged(nsRestyleHint(0), nsChangeHint(0));
+ }
+}
+
+void nsPresContext::StopEmulatingMedium()
+{
+ nsIAtom* previousMedium = Medium();
+ mIsEmulatingMedia = false;
+ if (Medium() != previousMedium) {
+ MediaFeatureValuesChanged(nsRestyleHint(0), nsChangeHint(0));
+ }
+}
+
+void
+nsPresContext::RebuildAllStyleData(nsChangeHint aExtraHint,
+ nsRestyleHint aRestyleHint)
+{
+ if (!mShell) {
+ // We must have been torn down. Nothing to do here.
+ return;
+ }
+
+ mUsesRootEMUnits = false;
+ mUsesExChUnits = false;
+ mUsesViewportUnits = false;
+ mDocument->RebuildUserFontSet();
+ RebuildCounterStyles();
+
+ RestyleManager()->RebuildAllStyleData(aExtraHint, aRestyleHint);
+}
+
+void
+nsPresContext::PostRebuildAllStyleDataEvent(nsChangeHint aExtraHint,
+ nsRestyleHint aRestyleHint)
+{
+ if (!mShell) {
+ // We must have been torn down. Nothing to do here.
+ return;
+ }
+ RestyleManager()->PostRebuildAllStyleDataEvent(aExtraHint, aRestyleHint);
+}
+
+struct MediaFeatureHints
+{
+ nsRestyleHint restyleHint;
+ nsChangeHint changeHint;
+};
+
+static bool
+MediaFeatureValuesChangedAllDocumentsCallback(nsIDocument* aDocument, void* aHints)
+{
+ MediaFeatureHints* hints = static_cast<MediaFeatureHints*>(aHints);
+ if (nsIPresShell* shell = aDocument->GetShell()) {
+ if (nsPresContext* pc = shell->GetPresContext()) {
+ pc->MediaFeatureValuesChangedAllDocuments(hints->restyleHint,
+ hints->changeHint);
+ }
+ }
+ return true;
+}
+
+void
+nsPresContext::MediaFeatureValuesChangedAllDocuments(nsRestyleHint aRestyleHint,
+ nsChangeHint aChangeHint)
+{
+ MediaFeatureValuesChanged(aRestyleHint, aChangeHint);
+ MediaFeatureHints hints = {
+ aRestyleHint,
+ aChangeHint
+ };
+
+ mDocument->EnumerateSubDocuments(MediaFeatureValuesChangedAllDocumentsCallback,
+ &hints);
+}
+
+void
+nsPresContext::MediaFeatureValuesChanged(nsRestyleHint aRestyleHint,
+ nsChangeHint aChangeHint)
+{
+ mPendingMediaFeatureValuesChanged = false;
+
+ // MediumFeaturesChanged updates the applied rules, so it always gets called.
+ if (mShell) {
+ // XXXheycam ServoStyleSets don't support responding to medium
+ // changes yet.
+ if (mShell->StyleSet()->IsGecko()) {
+ if (mShell->StyleSet()->AsGecko()->MediumFeaturesChanged()) {
+ aRestyleHint |= eRestyle_Subtree;
+ }
+ } else {
+ NS_WARNING("stylo: ServoStyleSets don't support responding to medium "
+ "changes yet. See bug 1290228.");
+ }
+ }
+
+ if (mUsesViewportUnits && mPendingViewportChange) {
+ // Rebuild all style data without rerunning selector matching.
+ aRestyleHint |= eRestyle_ForceDescendants;
+ }
+
+ if (aRestyleHint || aChangeHint) {
+ RebuildAllStyleData(aChangeHint, aRestyleHint);
+ }
+
+ mPendingViewportChange = false;
+
+ if (mDocument->IsBeingUsedAsImage()) {
+ MOZ_ASSERT(PR_CLIST_IS_EMPTY(mDocument->MediaQueryLists()));
+ return;
+ }
+
+ mDocument->NotifyMediaFeatureValuesChanged();
+
+ MOZ_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 (!PR_CLIST_IS_EMPTY(mDocument->MediaQueryLists())) {
+ // We build a list of all the notifications we're going to send
+ // before we send any of them. (The spec says the notifications
+ // should be a queued task, so any removals that happen during the
+ // notifications shouldn't affect what gets notified.) Furthermore,
+ // we hold strong pointers to everything we're going to make
+ // notification calls to, since each notification involves calling
+ // arbitrary script that might otherwise destroy these objects, or,
+ // for that matter, |this|.
+ //
+ // Note that we intentionally send the notifications to media query
+ // list in the order they were created and, for each list, to the
+ // listeners in the order added.
+ nsTArray<MediaQueryList::HandleChangeData> notifyList;
+ for (PRCList *l = PR_LIST_HEAD(mDocument->MediaQueryLists());
+ l != mDocument->MediaQueryLists(); l = PR_NEXT_LINK(l)) {
+ MediaQueryList *mql = static_cast<MediaQueryList*>(l);
+ mql->MediumFeaturesChanged(notifyList);
+ }
+
+ if (!notifyList.IsEmpty()) {
+ for (uint32_t i = 0, i_end = notifyList.Length(); i != i_end; ++i) {
+ nsAutoMicroTask mt;
+ MediaQueryList::HandleChangeData &d = notifyList[i];
+ d.callback->Call(*d.mql);
+ }
+ }
+
+ // NOTE: When |notifyList| goes out of scope, our destructor could run.
+ }
+}
+
+void
+nsPresContext::PostMediaFeatureValuesChangedEvent()
+{
+ // FIXME: We should probably replace this event with use of
+ // nsRefreshDriver::AddStyleFlushObserver (except the pres shell would
+ // need to track whether it's been added).
+ if (!mPendingMediaFeatureValuesChanged) {
+ nsCOMPtr<nsIRunnable> ev =
+ NewRunnableMethod(this, &nsPresContext::HandleMediaFeatureValuesChangedEvent);
+ if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+ mPendingMediaFeatureValuesChanged = true;
+ mDocument->SetNeedStyleFlush();
+ }
+ }
+}
+
+void
+nsPresContext::HandleMediaFeatureValuesChangedEvent()
+{
+ // Null-check mShell in case the shell has been destroyed (and the
+ // event is the only thing holding the pres context alive).
+ if (mPendingMediaFeatureValuesChanged && mShell) {
+ MediaFeatureValuesChanged(nsRestyleHint(0));
+ }
+}
+
+static bool
+NotifyTabSizeModeChanged(TabParent* aTab, void* aArg)
+{
+ nsSizeMode* sizeMode = static_cast<nsSizeMode*>(aArg);
+ aTab->SizeModeChanged(*sizeMode);
+ return false;
+}
+
+void
+nsPresContext::SizeModeChanged(nsSizeMode aSizeMode)
+{
+ if (HasCachedStyleData()) {
+ nsContentUtils::CallOnAllRemoteChildren(mDocument->GetWindow(),
+ NotifyTabSizeModeChanged,
+ &aSizeMode);
+ MediaFeatureValuesChangedAllDocuments(nsRestyleHint(0));
+ }
+}
+
+nsCompatibility
+nsPresContext::CompatibilityMode() const
+{
+ return Document()->GetCompatibilityMode();
+}
+
+void
+nsPresContext::SetPaginatedScrolling(bool aPaginated)
+{
+ if (mType == eContext_PrintPreview || mType == eContext_PageLayout)
+ mCanPaginatedScroll = aPaginated;
+}
+
+void
+nsPresContext::SetPrintSettings(nsIPrintSettings *aPrintSettings)
+{
+ if (mMedium == nsGkAtoms::print)
+ mPrintSettings = aPrintSettings;
+}
+
+bool
+nsPresContext::EnsureVisible()
+{
+ nsCOMPtr<nsIDocShell> docShell(mContainer);
+ if (docShell) {
+ nsCOMPtr<nsIContentViewer> cv;
+ docShell->GetContentViewer(getter_AddRefs(cv));
+ // Make sure this is the content viewer we belong with
+ if (cv) {
+ RefPtr<nsPresContext> currentPresContext;
+ cv->GetPresContext(getter_AddRefs(currentPresContext));
+ if (currentPresContext == this) {
+ // OK, this is us. We want to call Show() on the content viewer.
+ nsresult result = cv->Show();
+ if (NS_SUCCEEDED(result)) {
+ return true;
+ }
+ }
+ }
+ }
+ return false;
+}
+
+#ifdef MOZ_REFLOW_PERF
+void
+nsPresContext::CountReflows(const char * aName, nsIFrame * aFrame)
+{
+ if (mShell) {
+ mShell->CountReflows(aName, aFrame);
+ }
+}
+#endif
+
+void
+nsPresContext::UpdateIsChrome()
+{
+ mIsChrome = mContainer &&
+ nsIDocShellTreeItem::typeChrome == mContainer->ItemType();
+}
+
+bool
+nsPresContext::HasAuthorSpecifiedRules(const nsIFrame *aFrame,
+ uint32_t ruleTypeMask) const
+{
+ return
+ nsRuleNode::HasAuthorSpecifiedRules(aFrame->StyleContext(),
+ ruleTypeMask,
+ UseDocumentColors());
+}
+
+gfxUserFontSet*
+nsPresContext::GetUserFontSet(bool aFlushUserFontSet)
+{
+ return mDocument->GetUserFontSet(aFlushUserFontSet);
+}
+
+void
+nsPresContext::UserFontSetUpdated(gfxUserFontEntry* aUpdatedFont)
+{
+ if (!mShell)
+ return;
+
+ bool usePlatformFontList = true;
+#if defined(MOZ_WIDGET_GTK)
+ usePlatformFontList = gfxPlatformGtk::UseFcFontList();
+#endif
+
+ // xxx - until the Linux platform font list is always used, use full
+ // restyle to force updates with gfxPangoFontGroup usage
+ // Note: this method is called without a font when rules in the userfont set
+ // are updated, which may occur during reflow as a result of the lazy
+ // initialization of the userfont set. It would be better to avoid a full
+ // restyle but until this method is only called outside of reflow, schedule a
+ // full restyle in these cases.
+ if (!usePlatformFontList || !aUpdatedFont) {
+ PostRebuildAllStyleDataEvent(NS_STYLE_HINT_REFLOW, eRestyle_ForceDescendants);
+ return;
+ }
+
+ // Special case - if either the 'ex' or 'ch' units are used, these
+ // depend upon font metrics. Updating this information requires
+ // rebuilding the rule tree from the top, avoiding the reuse of cached
+ // data even when no style rules have changed.
+ if (UsesExChUnits()) {
+ PostRebuildAllStyleDataEvent(nsChangeHint(0), eRestyle_ForceDescendants);
+ }
+
+ // 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.
+ nsIFrame* root = mShell->GetRootFrame();
+ if (root) {
+ nsFontFaceUtils::MarkDirtyForFontChange(root, aUpdatedFont);
+ }
+}
+
+void
+nsPresContext::FlushCounterStyles()
+{
+ if (!mShell) {
+ 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,
+ eRestyle_ForceDescendants);
+ }
+ mCounterStylesDirty = false;
+ }
+}
+
+void
+nsPresContext::RebuildCounterStyles()
+{
+ if (mCounterStyleManager->IsInitial()) {
+ // Still in its initial state, no need to reset.
+ return;
+ }
+
+ mCounterStylesDirty = true;
+ mDocument->SetNeedStyleFlush();
+ if (!mPostedFlushCounterStyles) {
+ nsCOMPtr<nsIRunnable> ev =
+ NewRunnableMethod(this, &nsPresContext::HandleRebuildCounterStyles);
+ if (NS_SUCCEEDED(NS_DispatchToCurrentThread(ev))) {
+ mPostedFlushCounterStyles = true;
+ }
+ }
+}
+
+void
+nsPresContext::NotifyMissingFonts()
+{
+ if (mMissingFonts) {
+ mMissingFonts->Flush();
+ }
+}
+
+void
+nsPresContext::EnsureSafeToHandOutCSSRules()
+{
+ nsStyleSet* styleSet = mShell->StyleSet()->GetAsGecko();
+ if (!styleSet) {
+ // ServoStyleSets do not need to handle copy-on-write style sheet
+ // innards like with CSSStyleSheets.
+ return;
+ }
+
+ if (!styleSet->EnsureUniqueInnerOnCSSSheets()) {
+ // Nothing to do.
+ return;
+ }
+
+ RebuildAllStyleData(nsChangeHint(0), eRestyle_Subtree);
+}
+
+void
+nsPresContext::FireDOMPaintEvent(nsInvalidateRequestList* aList, uint64_t aTransactionId)
+{
+ 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 = do_QueryInterface(ourWindow->GetParentTarget());
+ if (!dispatchTarget) {
+ return;
+ }
+ }
+ // 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, aTransactionId);
+
+ // 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(nsIDocument* aDocument, void* aData)
+{
+ bool *result = static_cast<bool*>(aData);
+ nsIPresShell* shell = aDocument->GetShell();
+ if (shell) {
+ nsPresContext* pc = shell->GetPresContext();
+ if (pc) {
+ *result = pc->MayHavePaintEventListenerInSubDocument();
+
+ // If we found a paint event listener, then we can stop enumerating
+ // sub documents.
+ return !*result;
+ }
+ }
+ return true;
+}
+
+static bool
+MayHavePaintEventListener(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(uint32_t aFlags)
+{
+ nsIFrame* rootFrame = PresShell()->FrameManager()->GetRootFrame();
+ NotifyInvalidation(rootFrame->GetVisualOverflowRect(), aFlags);
+ mAllInvalidated = true;
+}
+
+void
+nsPresContext::NotifyInvalidation(const nsIntRect& aRect, uint32_t aFlags)
+{
+ // 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(rect, aFlags);
+}
+
+void
+nsPresContext::NotifyInvalidation(const nsRect& aRect, uint32_t aFlags)
+{
+ MOZ_ASSERT(GetContainerWeak(), "Invalidation in detached pres context");
+
+ // If there is no paint event listener, then we don't need to fire
+ // the asynchronous event. We don't even need to record invalidation.
+ // MayHavePaintEventListener is pretty cheap and we could make it
+ // even cheaper by providing a more efficient
+ // nsPIDOMWindow::GetListenerManager.
+
+ if (mAllInvalidated) {
+ return;
+ }
+
+ nsPresContext* pc;
+ for (pc = this; pc; pc = pc->GetParentPresContext()) {
+ if (pc->mFireAfterPaintEvents)
+ break;
+ pc->mFireAfterPaintEvents = true;
+ }
+ if (!pc) {
+ nsRootPresContext* rpc = GetRootPresContext();
+ if (rpc) {
+ rpc->EnsureEventualDidPaintEvent();
+ }
+ }
+
+ nsInvalidateRequestList::Request* request =
+ mInvalidateRequestsSinceLastPaint.mRequests.AppendElement();
+ if (!request)
+ return;
+
+ request->mRect = aRect;
+ request->mFlags = aFlags;
+}
+
+/* static */ void
+nsPresContext::NotifySubDocInvalidation(ContainerLayer* aContainer,
+ const nsIntRegion& aRegion)
+{
+ ContainerLayerPresContext *data =
+ static_cast<ContainerLayerPresContext*>(
+ aContainer->GetUserData(&gNotifySubDocInvalidationData));
+ if (!data) {
+ return;
+ }
+
+ nsIntPoint topLeft = aContainer->GetVisibleRegion().ToUnknownRegion().GetBounds().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(rect, 0);
+ }
+}
+
+void
+nsPresContext::SetNotifySubDocInvalidationData(ContainerLayer* aContainer)
+{
+ ContainerLayerPresContext* pres = new ContainerLayerPresContext;
+ pres->mPresContext = this;
+ aContainer->SetUserData(&gNotifySubDocInvalidationData, pres);
+}
+
+/* static */ void
+nsPresContext::ClearNotifySubDocInvalidationData(ContainerLayer* aContainer)
+{
+ aContainer->SetUserData(&gNotifySubDocInvalidationData, nullptr);
+}
+
+struct NotifyDidPaintSubdocumentCallbackClosure {
+ uint32_t mFlags;
+ uint64_t mTransactionId;
+ bool mNeedsAnotherDidPaintNotification;
+};
+static bool
+NotifyDidPaintSubdocumentCallback(nsIDocument* aDocument, void* aData)
+{
+ NotifyDidPaintSubdocumentCallbackClosure* closure =
+ static_cast<NotifyDidPaintSubdocumentCallbackClosure*>(aData);
+ nsIPresShell* shell = aDocument->GetShell();
+ if (shell) {
+ nsPresContext* pc = shell->GetPresContext();
+ if (pc) {
+ pc->NotifyDidPaintForSubtree(closure->mFlags, closure->mTransactionId);
+ if (pc->IsDOMPaintEventPending()) {
+ closure->mNeedsAnotherDidPaintNotification = true;
+ }
+ }
+ }
+ return true;
+}
+
+class DelayedFireDOMPaintEvent : public Runnable {
+public:
+ DelayedFireDOMPaintEvent(nsPresContext* aPresContext,
+ nsInvalidateRequestList* aList,
+ uint64_t aTransactionId)
+ : mPresContext(aPresContext)
+ , mTransactionId(aTransactionId)
+ {
+ MOZ_ASSERT(mPresContext->GetContainerWeak(),
+ "DOMPaintEvent requested for a detached pres context");
+ mList.TakeFrom(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);
+ }
+ return NS_OK;
+ }
+
+ RefPtr<nsPresContext> mPresContext;
+ uint64_t mTransactionId;
+ nsInvalidateRequestList mList;
+};
+
+void
+nsPresContext::NotifyDidPaintForSubtree(uint32_t aFlags, uint64_t aTransactionId,
+ const mozilla::TimeStamp& aTimeStamp)
+{
+ if (IsRoot()) {
+ static_cast<nsRootPresContext*>(this)->CancelDidPaintTimer();
+
+ if (!mFireAfterPaintEvents) {
+ return;
+ }
+ }
+
+ if (!PresShell()->IsVisible() && !mFireAfterPaintEvents) {
+ return;
+ }
+
+ // Non-root prescontexts fire MozAfterPaint to all their descendants
+ // unconditionally, even if no invalidations have been collected. This is
+ // because we don't want to eat the cost of collecting invalidations for
+ // every subdocument (which would require putting every subdocument in its
+ // own layer).
+
+ if (aFlags & nsIPresShell::PAINT_LAYERS) {
+ mUndeliveredInvalidateRequestsBeforeLastPaint.TakeFrom(
+ &mInvalidateRequestsSinceLastPaint);
+ mAllInvalidated = false;
+ }
+ if (aFlags & nsIPresShell::PAINT_COMPOSITE) {
+ nsCOMPtr<nsIRunnable> ev =
+ new DelayedFireDOMPaintEvent(this, &mUndeliveredInvalidateRequestsBeforeLastPaint,
+ aTransactionId);
+ nsContentUtils::AddScriptRunner(ev);
+ }
+
+ NotifyDidPaintSubdocumentCallbackClosure closure = { aFlags, aTransactionId, false };
+ mDocument->EnumerateSubDocuments(NotifyDidPaintSubdocumentCallback, &closure);
+
+ if (!closure.mNeedsAnotherDidPaintNotification &&
+ mInvalidateRequestsSinceLastPaint.IsEmpty() &&
+ mUndeliveredInvalidateRequestsBeforeLastPaint.IsEmpty()) {
+ // Nothing more to do for the moment.
+ mFireAfterPaintEvents = false;
+ } else {
+ if (IsRoot()) {
+ static_cast<nsRootPresContext*>(this)->EnsureEventualDidPaintEvent();
+ }
+ }
+}
+
+bool
+nsPresContext::HasCachedStyleData()
+{
+ if (!mShell) {
+ return false;
+ }
+
+ nsStyleSet* styleSet = mShell->StyleSet()->GetAsGecko();
+ if (!styleSet) {
+ // XXXheycam ServoStyleSets do not use the rule tree, so just assume for now
+ // that we need to restyle when e.g. dppx changes assuming we're sufficiently
+ // bootstrapped.
+ return mShell->DidInitialize();
+ }
+
+ return styleSet->HasCachedStyleData();
+}
+
+already_AddRefed<nsITimer>
+nsPresContext::CreateTimer(nsTimerCallbackFunc aCallback,
+ uint32_t aDelay)
+{
+ nsCOMPtr<nsITimer> timer = do_CreateInstance("@mozilla.org/timer;1");
+ if (timer) {
+ nsresult rv = timer->InitWithFuncCallback(aCallback, this, aDelay,
+ nsITimer::TYPE_ONE_SHOT);
+ if (NS_SUCCEEDED(rv)) {
+ return timer.forget();
+ }
+ }
+
+ return nullptr;
+}
+
+static bool sGotInterruptEnv = false;
+enum InterruptMode {
+ ModeRandom,
+ ModeCounter,
+ ModeEvent
+};
+// Controlled by the GECKO_REFLOW_INTERRUPT_MODE env var; allowed values are
+// "random" (except on Windows) or "counter". If neither is used, the mode is
+// ModeEvent.
+static InterruptMode sInterruptMode = ModeEvent;
+#ifndef XP_WIN
+// Used for the "random" mode. Controlled by the GECKO_REFLOW_INTERRUPT_SEED
+// env var.
+static uint32_t sInterruptSeed = 1;
+#endif
+// Used for the "counter" mode. This is the number of unskipped interrupt
+// checks that have to happen before we interrupt. Controlled by the
+// GECKO_REFLOW_INTERRUPT_FREQUENCY env var.
+static uint32_t sInterruptMaxCounter = 10;
+// Used for the "counter" mode. This counts up to sInterruptMaxCounter and is
+// then reset to 0.
+static uint32_t sInterruptCounter;
+// Number of interrupt checks to skip before really trying to interrupt.
+// Controlled by the GECKO_REFLOW_INTERRUPT_CHECKS_TO_SKIP env var.
+static uint32_t sInterruptChecksToSkip = 200;
+// Number of milliseconds that a reflow should be allowed to run for before we
+// actually allow interruption. Controlled by the
+// GECKO_REFLOW_MIN_NOINTERRUPT_DURATION env var. Can't be initialized here,
+// because TimeDuration/TimeStamp is not safe to use in static constructors..
+static TimeDuration sInterruptTimeout;
+
+static void GetInterruptEnv()
+{
+ char *ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_MODE");
+ if (ev) {
+#ifndef XP_WIN
+ if (PL_strcasecmp(ev, "random") == 0) {
+ ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_SEED");
+ if (ev) {
+ sInterruptSeed = atoi(ev);
+ }
+ srandom(sInterruptSeed);
+ sInterruptMode = ModeRandom;
+ } else
+#endif
+ if (PL_strcasecmp(ev, "counter") == 0) {
+ ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_FREQUENCY");
+ if (ev) {
+ sInterruptMaxCounter = atoi(ev);
+ }
+ sInterruptCounter = 0;
+ sInterruptMode = ModeCounter;
+ }
+ }
+ ev = PR_GetEnv("GECKO_REFLOW_INTERRUPT_CHECKS_TO_SKIP");
+ if (ev) {
+ sInterruptChecksToSkip = atoi(ev);
+ }
+
+ ev = PR_GetEnv("GECKO_REFLOW_MIN_NOINTERRUPT_DURATION");
+ int duration_ms = ev ? atoi(ev) : 100;
+ sInterruptTimeout = TimeDuration::FromMilliseconds(duration_ms);
+}
+
+bool
+nsPresContext::HavePendingInputEvent()
+{
+ switch (sInterruptMode) {
+#ifndef XP_WIN
+ case ModeRandom:
+ return (random() & 1);
+#endif
+ case ModeCounter:
+ if (sInterruptCounter < sInterruptMaxCounter) {
+ ++sInterruptCounter;
+ return false;
+ }
+ sInterruptCounter = 0;
+ return true;
+ default:
+ case ModeEvent: {
+ nsIFrame* f = PresShell()->GetRootFrame();
+ if (f) {
+ nsIWidget* w = f->GetNearestWidget();
+ if (w) {
+ return w->HasPendingInputEvent();
+ }
+ }
+ return false;
+ }
+ }
+}
+
+void
+nsPresContext::NotifyFontFaceSetOnRefresh()
+{
+ FontFaceSet* set = mDocument->GetFonts();
+ if (set) {
+ set->DidRefresh();
+ }
+}
+
+bool
+nsPresContext::HasPendingRestyleOrReflow()
+{
+ return (mRestyleManager && mRestyleManager->HasPendingRestyles()) ||
+ 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) {
+ mShell->FrameNeedsToContinueReflow(aFrame);
+ return true;
+ }
+
+ if (!sGotInterruptEnv) {
+ sGotInterruptEnv = true;
+ GetInterruptEnv();
+ }
+
+ if (!mInterruptsEnabled) {
+ return false;
+ }
+
+ if (mInterruptChecksToSkip > 0) {
+ --mInterruptChecksToSkip;
+ return false;
+ }
+ mInterruptChecksToSkip = sInterruptChecksToSkip;
+
+ // Don't interrupt if it's been less than sInterruptTimeout since we started
+ // the reflow.
+ mHasPendingInterrupt =
+ TimeStamp::Now() - mReflowStartTime > sInterruptTimeout &&
+ HavePendingInputEvent() &&
+ !IsChrome();
+
+ if (mPendingInterruptFromTest) {
+ mPendingInterruptFromTest = false;
+ mHasPendingInterrupt = true;
+ }
+
+ if (mHasPendingInterrupt) {
+#ifdef NOISY_INTERRUPTIBLE_REFLOW
+ printf("*** DETECTED pending interrupt (time=%lld)\n", PR_Now());
+#endif /* NOISY_INTERRUPTIBLE_REFLOW */
+ mShell->FrameNeedsToContinueReflow(aFrame);
+ }
+ return mHasPendingInterrupt;
+}
+
+nsIFrame*
+nsPresContext::GetPrimaryFrameFor(nsIContent* aContent)
+{
+ NS_PRECONDITION(aContent, "Don't do that");
+ if (GetPresShell() &&
+ GetPresShell()->GetDocument() == aContent->GetComposedDoc()) {
+ return aContent->GetPrimaryFrame();
+ }
+ return nullptr;
+}
+
+size_t
+nsPresContext::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
+{
+ return mPropertyTable.SizeOfExcludingThis(aMallocSizeOf) +
+ mLangGroupFontPrefs.SizeOfExcludingThis(aMallocSizeOf);
+
+ // Measurement of other members may be added later if DMD finds it is
+ // worthwhile.
+}
+
+bool
+nsPresContext::IsRootContentDocument() 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();
+ }
+ }
+}
+
+bool nsPresContext::GetPaintFlashing() const
+{
+ if (!mPaintFlashingInitialized) {
+ bool pref = Preferences::GetBool("nglayout.debug.paint_flashing");
+ if (!pref && IsChrome()) {
+ pref = Preferences::GetBool("nglayout.debug.paint_flashing_chrome");
+ }
+ mPaintFlashing = pref;
+ mPaintFlashingInitialized = true;
+ }
+ return mPaintFlashing;
+}
+
+int32_t
+nsPresContext::AppUnitsPerDevPixel() const
+{
+ return mDeviceContext->AppUnitsPerDevPixel();
+}
+
+nscoord
+nsPresContext::GfxUnitsToAppUnits(gfxFloat aGfxUnits) const
+{
+ return mDeviceContext->GfxUnitsToAppUnits(aGfxUnits);
+}
+
+gfxFloat
+nsPresContext::AppUnitsToGfxUnits(nscoord aAppUnits) const
+{
+ return mDeviceContext->AppUnitsToGfxUnits(aAppUnits);
+}
+
+bool
+nsPresContext::IsDeviceSizePageSize()
+{
+ bool isDeviceSizePageSize = false;
+ nsCOMPtr<nsIDocShell> docShell(mContainer);
+ if (docShell) {
+ isDeviceSizePageSize = docShell->GetDeviceSizeIsPageSize();
+ }
+ return isDeviceSizePageSize;
+}
+
+uint64_t
+nsPresContext::GetRestyleGeneration() const
+{
+ if (!mRestyleManager) {
+ return 0;
+ }
+ return mRestyleManager->GetRestyleGeneration();
+}
+
+nsRootPresContext::nsRootPresContext(nsIDocument* aDocument,
+ nsPresContextType aType)
+ : nsPresContext(aDocument, aType),
+ mDOMGeneration(0)
+{
+}
+
+nsRootPresContext::~nsRootPresContext()
+{
+ NS_ASSERTION(mRegisteredPlugins.Count() == 0,
+ "All plugins should have been unregistered");
+ CancelDidPaintTimer();
+ CancelApplyPluginGeometryTimer();
+}
+
+/* virtual */ void
+nsRootPresContext::Detach()
+{
+ CancelDidPaintTimer();
+ // XXXmats maybe also CancelApplyPluginGeometryTimer(); ?
+ nsPresContext::Detach();
+}
+
+void
+nsRootPresContext::RegisterPluginForGeometryUpdates(nsIContent* aPlugin)
+{
+ mRegisteredPlugins.PutEntry(aPlugin);
+}
+
+void
+nsRootPresContext::UnregisterPluginForGeometryUpdates(nsIContent* aPlugin)
+{
+ mRegisteredPlugins.RemoveEntry(aPlugin);
+}
+
+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();
+ }
+
+ nsIFrame* rootFrame = FrameManager()->GetRootFrame();
+
+ if (rootFrame && aBuilder->ContainsPluginItem()) {
+ aBuilder->SetForPluginGeometry();
+ aBuilder->SetAccurateVisibleRegions();
+ // Merging and flattening has already been done and we should not do it
+ // again. nsDisplayScroll(Info)Layer doesn't support trying to flatten
+ // again.
+ aBuilder->SetAllowMergingAndFlattening(false);
+ nsRegion region = rootFrame->GetVisualOverflowRectRelativeToSelf();
+ // nsDisplayPlugin::ComputeVisibility will automatically set a non-hidden
+ // widget configuration for the plugin, if it's visible.
+ aList->ComputeVisibilityForRoot(aBuilder, &region);
+ }
+
+#ifdef XP_MACOSX
+ // We control painting of Mac plugins, so just apply geometry updates now.
+ // This is not happening during a paint event.
+ ApplyPluginGeometryUpdates();
+#else
+ 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,
+ 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
+}
+
+static void
+NotifyDidPaintForSubtreeCallback(nsITimer *aTimer, void *aClosure)
+{
+ nsPresContext* presContext = (nsPresContext*)aClosure;
+ nsAutoScriptBlocker blockScripts;
+ // This is a fallback if we don't get paint events for some reason
+ // so we'll just pretend both layer painting and compositing happened.
+ presContext->NotifyDidPaintForSubtree(
+ nsIPresShell::PAINT_LAYERS | nsIPresShell::PAINT_COMPOSITE);
+}
+
+void
+nsRootPresContext::EnsureEventualDidPaintEvent()
+{
+ if (mNotifyDidPaintTimer)
+ return;
+
+ mNotifyDidPaintTimer = CreateTimer(NotifyDidPaintForSubtreeCallback, 100);
+}
+
+void
+nsRootPresContext::AddWillPaintObserver(nsIRunnable* aRunnable)
+{
+ if (!mWillPaintFallbackEvent.IsPending()) {
+ mWillPaintFallbackEvent = new RunWillPaintObservers(this);
+ NS_DispatchToMainThread(mWillPaintFallbackEvent.get());
+ }
+ mWillPaintObservers.AppendElement(aRunnable);
+}
+
+/**
+ * Run all runnables that need to get called before the next paint.
+ */
+void
+nsRootPresContext::FlushWillPaintObservers()
+{
+ mWillPaintFallbackEvent = nullptr;
+ nsTArray<nsCOMPtr<nsIRunnable> > observers;
+ observers.SwapElements(mWillPaintObservers);
+ for (uint32_t i = 0; i < observers.Length(); ++i) {
+ observers[i]->Run();
+ }
+}
+
+size_t
+nsRootPresContext::SizeOfExcludingThis(MallocSizeOf aMallocSizeOf) const
+{
+ return nsPresContext::SizeOfExcludingThis(aMallocSizeOf);
+
+ // Measurement of the following members may be added later if DMD finds it is
+ // worthwhile:
+ // - mNotifyDidPaintTimer
+ // - mRegisteredPlugins
+ // - mWillPaintObservers
+ // - mWillPaintFallbackEvent
+}