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gecko-dev/layout/base/nsPresContext.h

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/* a presentation of a document, part 1 */
#ifndef nsPresContext_h___
#define nsPresContext_h___
#include "mozilla/Attributes.h"
#include "mozilla/EnumeratedArray.h"
#include "mozilla/NotNull.h"
#include "mozilla/ScrollStyles.h"
#include "mozilla/PreferenceSheet.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/WeakPtr.h"
#include "nsColor.h"
#include "nsCoord.h"
#include "nsCOMPtr.h"
#include "nsRect.h"
#include "nsStringFwd.h"
#include "gfxFontConstants.h"
#include "nsAtom.h"
#include "nsCRT.h"
#include "nsIWidgetListener.h" // for nsSizeMode
#include "nsGkAtoms.h"
#include "nsCycleCollectionParticipant.h"
#include "nsChangeHint.h"
#include <algorithm>
#include "gfxTypes.h"
#include "gfxRect.h"
#include "nsTArray.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/TimeStamp.h"
#include "mozilla/AppUnits.h"
#include "mozilla/MediaEmulationData.h"
#include "mozilla/PresShellForwards.h"
#include "prclist.h"
#include "nsThreadUtils.h"
#include "Units.h"
#include "prenv.h"
class nsBidi;
class nsIPrintSettings;
class nsDocShell;
class nsIDocShell;
class nsITheme;
class nsITimer;
class nsIContent;
class nsIFrame;
class nsFrameManager;
class nsAtom;
class nsIRunnable;
class gfxFontFeatureValueSet;
class gfxUserFontEntry;
class gfxUserFontSet;
class gfxTextPerfMetrics;
class nsCSSFontFeatureValuesRule;
class nsCSSFrameConstructor;
class nsDisplayList;
class nsDisplayListBuilder;
class nsPluginFrame;
class nsTransitionManager;
class nsAnimationManager;
class nsRefreshDriver;
class nsIWidget;
class nsDeviceContext;
class gfxMissingFontRecorder;
namespace mozilla {
class AnimationEventDispatcher;
class EffectCompositor;
class Encoding;
class EventStateManager;
class CounterStyleManager;
class PresShell;
class RestyleManager;
class StaticPresData;
struct MediaFeatureChange;
namespace layers {
class ContainerLayer;
class LayerManager;
} // namespace layers
namespace dom {
class Document;
class Element;
} // namespace dom
} // namespace mozilla
// supported values for cached integer pref types
enum nsPresContext_CachedIntPrefType {
kPresContext_ScrollbarSide = 1,
kPresContext_BidiDirection
};
// IDs for the default variable and fixed fonts (not to be changed, see
// nsFont.h) To be used for Get/SetDefaultFont(). The other IDs in nsFont.h are
// also supported.
//
// kGenericFont_moz_variable
const uint8_t kPresContext_DefaultVariableFont_ID = 0x00;
// kGenericFont_moz_fixed
const uint8_t kPresContext_DefaultFixedFont_ID = 0x01;
#ifdef DEBUG
struct nsAutoLayoutPhase;
enum class nsLayoutPhase : uint8_t {
Paint,
DisplayListBuilding, // sometimes a subset of the paint phase
Reflow,
FrameC,
COUNT
};
#endif
/* Used by nsPresContext::HasAuthorSpecifiedRules */
#define NS_AUTHOR_SPECIFIED_BACKGROUND (1 << 0)
#define NS_AUTHOR_SPECIFIED_BORDER (1 << 1)
#define NS_AUTHOR_SPECIFIED_PADDING (1 << 2)
class nsRootPresContext;
// An interface for presentation contexts. Presentation contexts are
// objects that provide an outer context for a presentation shell.
class nsPresContext : public nsISupports,
public mozilla::SupportsWeakPtr<nsPresContext> {
public:
using Encoding = mozilla::Encoding;
template <typename T>
using NotNull = mozilla::NotNull<T>;
using MediaEmulationData = mozilla::MediaEmulationData;
using StylePrefersColorScheme = mozilla::StylePrefersColorScheme;
typedef mozilla::ScrollStyles ScrollStyles;
using TransactionId = mozilla::layers::TransactionId;
NS_DECL_CYCLE_COLLECTING_ISUPPORTS_FINAL
NS_DECL_CYCLE_COLLECTION_CLASS(nsPresContext)
MOZ_DECLARE_WEAKREFERENCE_TYPENAME(nsPresContext)
enum nsPresContextType {
eContext_Galley, // unpaginated screen presentation
eContext_PrintPreview, // paginated screen presentation
eContext_Print, // paginated printer presentation
eContext_PageLayout // paginated & editable.
};
nsPresContext(mozilla::dom::Document* aDocument, nsPresContextType aType);
/**
* Initialize the presentation context from a particular device.
*/
nsresult Init(nsDeviceContext* aDeviceContext);
/**
* Set and detach presentation shell that this context is bound to.
* A presentation context may only be bound to a single shell.
*/
void AttachPresShell(mozilla::PresShell* aPresShell);
void DetachPresShell();
nsPresContextType Type() const { return mType; }
/**
* Get the PresentationShell that this context is bound to.
*/
mozilla::PresShell* PresShell() const {
NS_ASSERTION(mPresShell, "Null pres shell");
return mPresShell;
}
mozilla::PresShell* GetPresShell() const { return mPresShell; }
void DocumentCharSetChanged(NotNull<const Encoding*> aCharSet);
/**
* Returns the parent prescontext for this one. Returns null if this is a
* root.
*/
nsPresContext* GetParentPresContext() const;
/**
* Returns the prescontext of the toplevel content document that contains
* this presentation, or null if there isn't one.
*/
nsPresContext* GetToplevelContentDocumentPresContext();
/**
* Returns the nearest widget for the root frame or view of this.
*
* @param aOffset If non-null the offset from the origin of the root
* frame's view to the widget's origin (usually positive)
* expressed in appunits of this will be returned in
* aOffset.
*/
nsIWidget* GetNearestWidget(nsPoint* aOffset = nullptr);
/**
* Returns the root widget for this.
*/
nsIWidget* GetRootWidget() const;
/**
* Returns the widget which may have native focus and handles text input
* like keyboard input, IME, etc.
*/
nsIWidget* GetTextInputHandlingWidget() const {
// Currently, root widget for each PresContext handles text input.
return GetRootWidget();
}
/**
* Return the presentation context for the root of the view manager
* hierarchy that contains this presentation context, or nullptr if it can't
* be found (e.g. it's detached).
*/
nsRootPresContext* GetRootPresContext() const;
virtual bool IsRoot() { return false; }
mozilla::dom::Document* Document() const {
#ifdef DEBUG
ValidatePresShellAndDocumentReleation();
#endif // #ifdef DEBUG
return mDocument;
}
inline mozilla::ServoStyleSet* StyleSet() const;
bool HasPendingMediaQueryUpdates() const {
return !!mPendingMediaFeatureValuesChange;
}
inline nsCSSFrameConstructor* FrameConstructor();
mozilla::AnimationEventDispatcher* AnimationEventDispatcher() {
return mAnimationEventDispatcher;
}
mozilla::EffectCompositor* EffectCompositor() { return mEffectCompositor; }
nsTransitionManager* TransitionManager() { return mTransitionManager.get(); }
nsAnimationManager* AnimationManager() { return mAnimationManager.get(); }
const nsAnimationManager* AnimationManager() const {
return mAnimationManager.get();
}
nsRefreshDriver* RefreshDriver() { return mRefreshDriver; }
mozilla::RestyleManager* RestyleManager() {
MOZ_ASSERT(mRestyleManager);
return mRestyleManager.get();
}
mozilla::CounterStyleManager* CounterStyleManager() const {
return mCounterStyleManager;
}
/**
* Rebuilds all style data by throwing out the old rule tree and
* building a new one, and additionally applying a change hint (which must not
* contain nsChangeHint_ReconstructFrame) to the root frame.
*
* For the restyle hint argument, see RestyleManager::RebuildAllStyleData.
* Also rebuild the user font set and counter style manager.
*
* FIXME(emilio): The name of this is an utter lie. We should probably call
* this PostGlobalStyleChange or something, as it doesn't really rebuild
* anything unless you tell it to via the change hint / restyle hint
* machinery.
*/
void RebuildAllStyleData(nsChangeHint, const mozilla::RestyleHint&);
/**
* Just like RebuildAllStyleData, except (1) asynchronous and (2) it
* doesn't rebuild the user font set / counter-style manager / etc.
*/
void PostRebuildAllStyleDataEvent(nsChangeHint, const mozilla::RestyleHint&);
void ContentLanguageChanged();
/**
* Handle changes in the values of media features (used in media queries).
*/
void MediaFeatureValuesChanged(const mozilla::MediaFeatureChange& aChange);
void FlushPendingMediaFeatureValuesChanged();
/**
* Calls MediaFeatureValuesChanged for this pres context and all descendant
* subdocuments that have a pres context. This should be used for media
* features that must be updated in all subdocuments e.g. display-mode.
*/
void MediaFeatureValuesChangedAllDocuments(
const mozilla::MediaFeatureChange&);
/**
* Updates the size mode on all remote children and recursively notifies this
* document and all subdocuments (including remote children) that a media
* feature value has changed.
*/
void SizeModeChanged(nsSizeMode aSizeMode);
/**
* Access compatibility mode for this context. This is the same as
* our document's compatibility mode.
*/
nsCompatibility CompatibilityMode() const;
/**
* Access the image animation mode for this context
*/
uint16_t ImageAnimationMode() const { return mImageAnimationMode; }
void SetImageAnimationMode(uint16_t aMode);
/**
* Get medium of presentation
*/
const nsAtom* Medium() {
MOZ_ASSERT(mMedium);
return mMediaEmulationData.mMedium ? mMediaEmulationData.mMedium.get()
: mMedium;
}
/*
* Render the document as if being viewed on a device with the specified
* media type.
*
* If passed null, it stops emulating.
*/
void EmulateMedium(nsAtom* aMediaType);
/** Get a cached integer pref, by its type */
// * - initially created for bugs 30910, 61883, 74186, 84398
int32_t GetCachedIntPref(nsPresContext_CachedIntPrefType aPrefType) const {
// If called with a constant parameter, the compiler should optimize
// this switch statement away.
switch (aPrefType) {
case kPresContext_ScrollbarSide:
return mPrefScrollbarSide;
case kPresContext_BidiDirection:
return mPrefBidiDirection;
default:
NS_ERROR("invalid arg passed to GetCachedIntPref");
}
return false;
}
const mozilla::PreferenceSheet::Prefs& PrefSheetPrefs() const {
return mozilla::PreferenceSheet::PrefsFor(*mDocument);
}
nscolor DefaultBackgroundColor() const {
return PrefSheetPrefs().mDefaultBackgroundColor;
}
nsISupports* GetContainerWeak() const;
nsDocShell* GetDocShell() const;
/**
* Get the visible area associated with this presentation context.
* This is the size of the visible area that is used for
* presenting the document. The returned value is in the standard
* nscoord units (as scaled by the device context).
*/
nsRect GetVisibleArea() const { return mVisibleArea; }
/**
* Set the currently visible area. The units for r are standard
* nscoord units (as scaled by the device context).
*/
void SetVisibleArea(const nsRect& r);
nsSize GetSizeForViewportUnits() const { return mSizeForViewportUnits; }
/**
* Set the maximum height of the dynamic toolbar in nscoord units.
*/
MOZ_CAN_RUN_SCRIPT
void SetDynamicToolbarMaxHeight(mozilla::ScreenIntCoord aHeight);
mozilla::ScreenIntCoord GetDynamicToolbarMaxHeight() const {
MOZ_ASSERT(IsRootContentDocumentCrossProcess());
return mDynamicToolbarMaxHeight;
}
/**
* Returns true if we are using the dynamic toolbar.
*/
bool HasDynamicToolbar() const {
MOZ_ASSERT(IsRootContentDocumentCrossProcess());
return mDynamicToolbarMaxHeight > 0;
}
/*
* |aOffset| must be offset from the bottom edge of the ICB and it's negative.
*/
void UpdateDynamicToolbarOffset(mozilla::ScreenIntCoord aOffset);
mozilla::ScreenIntCoord GetDynamicToolbarHeight() const {
MOZ_ASSERT(IsRootContentDocumentCrossProcess());
return mDynamicToolbarHeight;
}
/**
* Returns the state of the dynamic toolbar.
*/
mozilla::DynamicToolbarState GetDynamicToolbarState() const;
/**
* Return true if this presentation context is a paginated
* context.
*/
bool IsPaginated() const { return mPaginated; }
/**
* Sets whether the presentation context can scroll for a paginated
* context.
*/
void SetPaginatedScrolling(bool aResult);
/**
* Return true if this presentation context can scroll for paginated
* context.
*/
bool HasPaginatedScrolling() const { return mCanPaginatedScroll; }
/**
* Get/set the size of a page
*/
nsSize GetPageSize() { return mPageSize; }
void SetPageSize(nsSize aSize) { mPageSize = aSize; }
/**
* Get/set whether this document should be treated as having real pages
* XXX This raises the obvious question of why a document that isn't a page
* is paginated; there isn't a good reason except history
*/
bool IsRootPaginatedDocument() { return mIsRootPaginatedDocument; }
void SetIsRootPaginatedDocument(bool aIsRootPaginatedDocument) {
mIsRootPaginatedDocument = aIsRootPaginatedDocument;
}
/**
* Get/set the print scaling level; used by nsPageFrame to scale up
* pages. Set safe to call before reflow, get guaranteed to be set
* properly after reflow.
*/
float GetPageScale() { return mPageScale; }
void SetPageScale(float aScale) { mPageScale = aScale; }
/**
* Get/set the scaling facor to use when rendering the pages for print
* preview. Only safe to get after print preview set up; safe to set anytime.
* This is a scaling factor for the display of the print preview. It
* does not affect layout. It only affects the size of the onscreen pages
* in print preview.
* XXX Temporary: see http://wiki.mozilla.org/Gecko:PrintPreview
*/
float GetPrintPreviewScale() { return mPPScale; }
void SetPrintPreviewScale(float aScale) { mPPScale = aScale; }
nsDeviceContext* DeviceContext() const { return mDeviceContext; }
mozilla::EventStateManager* EventStateManager() { return mEventManager; }
/**
* Get/set a text zoom factor that is applied on top of the normal text zoom
* set by the front-end/user.
*/
float GetSystemFontScale() const { return mSystemFontScale; }
void SetSystemFontScale(float aFontScale) {
MOZ_ASSERT(aFontScale > 0.0f, "invalid font scale");
if (aFontScale == mSystemFontScale || IsPrintingOrPrintPreview()) {
return;
}
mSystemFontScale = aFontScale;
UpdateEffectiveTextZoom();
}
/**
* Get/set the text zoom factor in use.
* This value should be used if you're interested in the pure text zoom value
* controlled by the front-end, e.g. when transferring zoom levels to a new
* document.
* Code that wants to use this value for layouting and rendering purposes
* should consider using EffectiveTextZoom() instead, so as to take the system
* font scale into account as well.
*/
float TextZoom() const { return mTextZoom; }
void SetTextZoom(float aZoom) {
MOZ_ASSERT(aZoom > 0.0f, "invalid zoom factor");
if (aZoom == mTextZoom) return;
mTextZoom = aZoom;
UpdateEffectiveTextZoom();
}
/**
* Notify the pres context that the safe area insets have changed.
*/
void SetSafeAreaInsets(const mozilla::ScreenIntMargin& aInsets);
mozilla::ScreenIntMargin GetSafeAreaInsets() const { return mSafeAreaInsets; }
protected:
void UpdateEffectiveTextZoom();
#ifdef DEBUG
void ValidatePresShellAndDocumentReleation() const;
#endif // #ifdef DEBUG
public:
/**
* Corresponds to the product of text zoom and system font scale, limited
* by zoom.maxPercent and minPercent.
* As the system font scale is automatically set by the PresShell, code that
* e.g. wants to transfer zoom levels to a new document should use TextZoom()
* instead, which corresponds to the text zoom level that was actually set by
* the front-end/user.
*/
float EffectiveTextZoom() const { return mEffectiveTextZoom; }
float GetFullZoom() { return mFullZoom; }
/**
* Device full zoom differs from full zoom because it gets the zoom from
* the device context, which may be using a different zoom due to rounding
* of app units to device pixels.
*/
float GetDeviceFullZoom();
void SetFullZoom(float aZoom);
float GetOverrideDPPX() const { return mMediaEmulationData.mDPPX; }
void SetOverrideDPPX(float);
Maybe<StylePrefersColorScheme> GetOverridePrefersColorScheme() const {
return mMediaEmulationData.mPrefersColorScheme;
}
void SetOverridePrefersColorScheme(const Maybe<StylePrefersColorScheme>&);
nscoord GetAutoQualityMinFontSize() {
return DevPixelsToAppUnits(mAutoQualityMinFontSizePixelsPref);
}
/**
* Return the device's screen size in inches, for font size
* inflation.
*
* If |aChanged| is non-null, then aChanged is filled in with whether
* the screen size value has changed since either:
* a. the last time the function was called with non-null aChanged, or
* b. the first time the function was called.
*/
gfxSize ScreenSizeInchesForFontInflation(bool* aChanged = nullptr);
int32_t AppUnitsPerDevPixel() const { return mCurAppUnitsPerDevPixel; }
static nscoord CSSPixelsToAppUnits(int32_t aPixels) {
return NSToCoordRoundWithClamp(float(aPixels) *
float(mozilla::AppUnitsPerCSSPixel()));
}
static nscoord CSSPixelsToAppUnits(float aPixels) {
return NSToCoordRoundWithClamp(aPixels *
float(mozilla::AppUnitsPerCSSPixel()));
}
static int32_t AppUnitsToIntCSSPixels(nscoord aAppUnits) {
return NSAppUnitsToIntPixels(aAppUnits,
float(mozilla::AppUnitsPerCSSPixel()));
}
static float AppUnitsToFloatCSSPixels(nscoord aAppUnits) {
return NSAppUnitsToFloatPixels(aAppUnits,
float(mozilla::AppUnitsPerCSSPixel()));
}
static double AppUnitsToDoubleCSSPixels(nscoord aAppUnits) {
return NSAppUnitsToDoublePixels(aAppUnits,
double(mozilla::AppUnitsPerCSSPixel()));
}
nscoord DevPixelsToAppUnits(int32_t aPixels) const {
return NSIntPixelsToAppUnits(aPixels, AppUnitsPerDevPixel());
}
int32_t AppUnitsToDevPixels(nscoord aAppUnits) const {
return NSAppUnitsToIntPixels(aAppUnits, float(AppUnitsPerDevPixel()));
}
float AppUnitsToFloatDevPixels(nscoord aAppUnits) {
return aAppUnits / float(AppUnitsPerDevPixel());
}
int32_t CSSPixelsToDevPixels(int32_t aPixels) {
return AppUnitsToDevPixels(CSSPixelsToAppUnits(aPixels));
}
float CSSPixelsToDevPixels(float aPixels) {
return NSAppUnitsToFloatPixels(CSSPixelsToAppUnits(aPixels),
float(AppUnitsPerDevPixel()));
}
int32_t DevPixelsToIntCSSPixels(int32_t aPixels) {
return AppUnitsToIntCSSPixels(DevPixelsToAppUnits(aPixels));
}
float DevPixelsToFloatCSSPixels(int32_t aPixels) const {
return AppUnitsToFloatCSSPixels(DevPixelsToAppUnits(aPixels));
}
mozilla::CSSToLayoutDeviceScale CSSToDevPixelScale() const {
return mozilla::CSSToLayoutDeviceScale(
float(mozilla::AppUnitsPerCSSPixel()) / float(AppUnitsPerDevPixel()));
}
// If there is a remainder, it is rounded to nearest app units.
nscoord GfxUnitsToAppUnits(gfxFloat aGfxUnits) const;
gfxFloat AppUnitsToGfxUnits(nscoord aAppUnits) const;
gfxRect AppUnitsToGfxUnits(const nsRect& aAppRect) const {
return gfxRect(AppUnitsToGfxUnits(aAppRect.x),
AppUnitsToGfxUnits(aAppRect.y),
AppUnitsToGfxUnits(aAppRect.Width()),
AppUnitsToGfxUnits(aAppRect.Height()));
}
static nscoord CSSTwipsToAppUnits(float aTwips) {
return NSToCoordRoundWithClamp(mozilla::AppUnitsPerCSSInch() *
NS_TWIPS_TO_INCHES(aTwips));
}
// Margin-specific version, since they often need TwipsToAppUnits
static nsMargin CSSTwipsToAppUnits(const nsIntMargin& marginInTwips) {
return nsMargin(CSSTwipsToAppUnits(float(marginInTwips.top)),
CSSTwipsToAppUnits(float(marginInTwips.right)),
CSSTwipsToAppUnits(float(marginInTwips.bottom)),
CSSTwipsToAppUnits(float(marginInTwips.left)));
}
static nscoord CSSPointsToAppUnits(float aPoints) {
return NSToCoordRound(aPoints * mozilla::AppUnitsPerCSSInch() /
POINTS_PER_INCH_FLOAT);
}
nscoord PhysicalMillimetersToAppUnits(float aMM) const;
nscoord RoundAppUnitsToNearestDevPixels(nscoord aAppUnits) const {
return DevPixelsToAppUnits(AppUnitsToDevPixels(aAppUnits));
}
/**
* This checks the root element and the HTML BODY, if any, for an "overflow"
* property that should be applied to the viewport. If one is found then we
* return the element that we took the overflow from (which should then be
* treated as "overflow: visible"), and we store the overflow style here.
* If the document is in fullscreen, and the fullscreen element is not the
* root, the scrollbar of viewport will be suppressed.
* @return if scroll was propagated from some content node, the content node
* it was propagated from.
*/
mozilla::dom::Element* UpdateViewportScrollStylesOverride();
/**
* Returns the cached result from the last call to
* UpdateViewportScrollStylesOverride() -- i.e. return the node
* whose scrollbar styles we have propagated to the viewport (or nullptr if
* there is no such node).
*/
mozilla::dom::Element* GetViewportScrollStylesOverrideElement() const {
return mViewportScrollOverrideElement;
}
const ScrollStyles& GetViewportScrollStylesOverride() const {
return mViewportScrollStyles;
}
/**
* Check whether the given element would propagate its scrollbar styles to the
* viewport in non-paginated mode. Must only be called if IsPaginated().
*/
bool ElementWouldPropagateScrollStyles(const mozilla::dom::Element&);
/**
* Set and get methods for controlling the background drawing
*/
bool GetBackgroundImageDraw() const { return mDrawImageBackground; }
void SetBackgroundImageDraw(bool aCanDraw) {
mDrawImageBackground = aCanDraw;
}
bool GetBackgroundColorDraw() const { return mDrawColorBackground; }
void SetBackgroundColorDraw(bool aCanDraw) {
mDrawColorBackground = aCanDraw;
}
/**
* Check if bidi enabled (set depending on the presence of RTL
* characters or when default directionality is RTL).
* If enabled, we should apply the Unicode Bidi Algorithm
*
* @lina 07/12/2000
*/
bool BidiEnabled() const;
/**
* Set bidi enabled. This means we should apply the Unicode Bidi Algorithm
*
* @lina 07/12/2000
*/
void SetBidiEnabled() const;
/**
* Set visual or implicit mode into the pres context.
*
* Visual directionality is a presentation method that displays text
* as if it were a uni-directional, according to the primary display
* direction only.
*
* Implicit directionality is a presentation method in which the
* direction is determined by the Bidi algorithm according to the
* category of the characters and the category of the adjacent
* characters, and according to their primary direction.
*
* @lina 05/02/2000
*/
void SetVisualMode(bool aIsVisual) { mIsVisual = aIsVisual; }
/**
* Check whether the content should be treated as visual.
*
* @lina 05/02/2000
*/
bool IsVisualMode() const { return mIsVisual; }
enum class InteractionType : uint32_t {
ClickInteraction,
KeyInteraction,
MouseMoveInteraction,
ScrollInteraction
};
void RecordInteractionTime(InteractionType aType,
const mozilla::TimeStamp& aTimeStamp);
void DisableInteractionTimeRecording() { mInteractionTimeEnabled = false; }
// Mohamed
/**
* Set the Bidi options for the presentation context
*/
void SetBidi(uint32_t aBidiOptions);
/**
* Get the Bidi options for the presentation context
* Not inline so consumers of nsPresContext are not forced to
* include Document.
*/
uint32_t GetBidi() const;
/*
* Obtain a native theme for rendering our widgets (both form controls and
* html)
*
* Guaranteed to return non-null.
*/
nsITheme* Theme() MOZ_NONNULL_RETURN {
if (MOZ_LIKELY(mTheme)) {
return mTheme;
}
return EnsureTheme();
}
/*
* Notify the pres context that the theme has changed. An internal switch
* means it's one of our Mozilla themes that changed (e.g., Modern to
* Classic). Otherwise, the OS is telling us that the native theme for the
* platform has changed.
*/
void ThemeChanged();
/*
* Notify the pres context that the resolution of the user interface has
* changed. This happens if a window is moved between HiDPI and non-HiDPI
* displays, so that the ratio of points to device pixels changes.
* The notification happens asynchronously.
*/
void UIResolutionChanged();
/*
* Like UIResolutionChanged() but invalidates values immediately.
*/
void UIResolutionChangedSync();
/*
* Notify the pres context that a system color has changed
*/
void SysColorChanged();
/** Printing methods below should only be used for Medium() == print **/
void SetPrintSettings(nsIPrintSettings* aPrintSettings);
nsIPrintSettings* GetPrintSettings() { return mPrintSettings; }
/* Helper function that ensures that this prescontext is shown in its
docshell if it's the most recent prescontext for the docshell. Returns
whether the prescontext is now being shown.
*/
bool EnsureVisible();
#ifdef MOZ_REFLOW_PERF
void CountReflows(const char* aName, nsIFrame* aFrame);
#endif
void ConstructedFrame() { ++mFramesConstructed; }
void ReflowedFrame() { ++mFramesReflowed; }
uint64_t FramesConstructedCount() { return mFramesConstructed; }
uint64_t FramesReflowedCount() { return mFramesReflowed; }
static nscoord GetBorderWidthForKeyword(unsigned int aBorderWidthKeyword) {
// This table maps border-width enums 'thin', 'medium', 'thick'
// to actual nscoord values.
static const nscoord kBorderWidths[] = {
CSSPixelsToAppUnits(1), CSSPixelsToAppUnits(3), CSSPixelsToAppUnits(5)};
MOZ_ASSERT(size_t(aBorderWidthKeyword) <
mozilla::ArrayLength(kBorderWidths));
return kBorderWidths[aBorderWidthKeyword];
}
gfxTextPerfMetrics* GetTextPerfMetrics() { return mTextPerf.get(); }
bool IsDynamic() {
return (mType == eContext_PageLayout || mType == eContext_Galley);
}
bool IsScreen() {
return (mMedium == nsGkAtoms::screen || mType == eContext_PageLayout ||
mType == eContext_PrintPreview);
}
bool IsPrintingOrPrintPreview() {
return (mType == eContext_Print || mType == eContext_PrintPreview);
}
// Is this presentation in a chrome docshell?
bool IsChrome() const;
// Public API for native theme code to get style internals.
bool HasAuthorSpecifiedRules(const nsIFrame* aFrame,
uint32_t ruleTypeMask) const;
// Explicitly enable and disable paint flashing.
void SetPaintFlashing(bool aPaintFlashing) {
mPaintFlashing = aPaintFlashing;
mPaintFlashingInitialized = true;
}
// This method should be used instead of directly accessing mPaintFlashing,
// as that value may be out of date when mPaintFlashingInitialized is false.
bool GetPaintFlashing() const;
bool SuppressingResizeReflow() const { return mSuppressResizeReflow; }
gfxUserFontSet* GetUserFontSet();
// Should be called whenever the set of fonts available in the user
// font set changes (e.g., because a new font loads, or because the
// user font set is changed and fonts become unavailable).
void UserFontSetUpdated(gfxUserFontEntry* aUpdatedFont = nullptr);
gfxMissingFontRecorder* MissingFontRecorder() { return mMissingFonts.get(); }
void NotifyMissingFonts();
void FlushCounterStyles();
void MarkCounterStylesDirty();
void FlushFontFeatureValues();
void MarkFontFeatureValuesDirty() { mFontFeatureValuesDirty = true; }
// Ensure that it is safe to hand out CSS rules outside the layout
// engine by ensuring that all CSS style sheets have unique inners
// and, if necessary, synchronously rebuilding all style data.
void EnsureSafeToHandOutCSSRules();
// Mark an area as invalidated, associated with a given transaction id
// (allocated by nsRefreshDriver::GetTransactionId). Invalidated regions will
// be dispatched to MozAfterPaint events when NotifyDidPaintForSubtree is
// called for the transaction id (or any higher id).
void NotifyInvalidation(TransactionId aTransactionId, const nsRect& aRect);
// aRect is in device pixels
void NotifyInvalidation(TransactionId aTransactionId, const nsIntRect& aRect);
void NotifyDidPaintForSubtree(
TransactionId aTransactionId = TransactionId{0},
const mozilla::TimeStamp& aTimeStamp = mozilla::TimeStamp());
void NotifyRevokingDidPaint(TransactionId aTransactionId);
void FireDOMPaintEvent(nsTArray<nsRect>* aList, TransactionId aTransactionId,
mozilla::TimeStamp aTimeStamp = mozilla::TimeStamp());
// Callback for catching invalidations in ContainerLayers
// Passed to LayerProperties::ComputeDifference
static void NotifySubDocInvalidation(
mozilla::layers::ContainerLayer* aContainer, const nsIntRegion* aRegion);
void SetNotifySubDocInvalidationData(
mozilla::layers::ContainerLayer* aContainer);
static void ClearNotifySubDocInvalidationData(
mozilla::layers::ContainerLayer* aContainer);
bool IsDOMPaintEventPending();
/**
* Returns the RestyleManager's restyle generation counter.
*/
uint64_t GetRestyleGeneration() const;
uint64_t GetUndisplayedRestyleGeneration() const;
/**
* Returns whether there are any pending restyles or reflows.
*/
bool HasPendingRestyleOrReflow();
/**
* Notify the prescontext that the presshell is about to reflow a reflow root.
* The single argument indicates whether this reflow should be interruptible.
* If aInterruptible is false then CheckForInterrupt and HasPendingInterrupt
* will always return false. If aInterruptible is true then CheckForInterrupt
* will return true when a pending event is detected. This is for use by the
* presshell only. Reflow code wanting to prevent interrupts should use
* InterruptPreventer.
*/
void ReflowStarted(bool aInterruptible);
/**
* A class that can be used to temporarily disable reflow interruption.
*/
class InterruptPreventer;
friend class InterruptPreventer;
class MOZ_STACK_CLASS InterruptPreventer {
public:
explicit InterruptPreventer(nsPresContext* aCtx)
: mCtx(aCtx),
mInterruptsEnabled(aCtx->mInterruptsEnabled),
mHasPendingInterrupt(aCtx->mHasPendingInterrupt) {
mCtx->mInterruptsEnabled = false;
mCtx->mHasPendingInterrupt = false;
}
~InterruptPreventer() {
mCtx->mInterruptsEnabled = mInterruptsEnabled;
mCtx->mHasPendingInterrupt = mHasPendingInterrupt;
}
private:
nsPresContext* mCtx;
bool mInterruptsEnabled;
bool mHasPendingInterrupt;
};
/**
* Check for interrupts. This may return true if a pending event is
* detected. Once it has returned true, it will keep returning true
* until ReflowStarted is called. In all cases where this returns true,
* the passed-in frame (which should be the frame whose reflow will be
* interrupted if true is returned) will be passed to
* PresShell::FrameNeedsToContinueReflow.
*/
bool CheckForInterrupt(nsIFrame* aFrame);
/**
* Returns true if CheckForInterrupt has returned true since the last
* ReflowStarted call. Cannot itself trigger an interrupt check.
*/
bool HasPendingInterrupt() { return mHasPendingInterrupt; }
/**
* Sets a flag that will trip a reflow interrupt. This only bypasses the
* interrupt timeout and the pending event check; other checks such as whether
* interrupts are enabled and the interrupt check skipping still take effect.
*/
void SetPendingInterruptFromTest() { mPendingInterruptFromTest = true; }
/**
* If we have a presshell, and if the given content's current
* document is the same as our presshell's document, return the
* content's primary frame. Otherwise, return null. Only use this
* if you care about which presshell the primary frame is in.
*/
nsIFrame* GetPrimaryFrameFor(nsIContent* aContent);
virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
virtual size_t SizeOfIncludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const {
return aMallocSizeOf(this) + SizeOfExcludingThis(aMallocSizeOf);
}
/**
* Deprecated. Please use the InProcess or CrossProcess variants
* to specify which behaviour you want.
*/
bool IsRootContentDocument() const;
/**
* We are a root content document in process if: we are not a resource doc, we
* are not chrome, and we either have no parent in the current process or our
* parent is chrome.
*/
bool IsRootContentDocumentInProcess() const;
/**
* We are a root content document cross process if: we are not a resource doc,
* we are not chrome, and we either have no parent in any process or our
* parent is chrome.
*/
bool IsRootContentDocumentCrossProcess() const;
bool HadNonBlankPaint() const { return mHadNonBlankPaint; }
bool HadContentfulPaint() const { return mHadContentfulPaint; }
void NotifyNonBlankPaint();
void NotifyContentfulPaint();
void NotifyDOMContentFlushed();
bool UsesExChUnits() const { return mUsesExChUnits; }
void SetUsesExChUnits(bool aValue) { mUsesExChUnits = aValue; }
// true if there are OMTA transition updates for the current document which
// have been throttled, and therefore some style information may not be up
// to date
bool ExistThrottledUpdates() const { return mExistThrottledUpdates; }
void SetExistThrottledUpdates(bool aExistThrottledUpdates) {
mExistThrottledUpdates = aExistThrottledUpdates;
}
bool IsDeviceSizePageSize();
bool HasWarnedAboutPositionedTableParts() const {
return mHasWarnedAboutPositionedTableParts;
}
void SetHasWarnedAboutPositionedTableParts() {
mHasWarnedAboutPositionedTableParts = true;
}
bool HasWarnedAboutTooLargeDashedOrDottedRadius() const {
return mHasWarnedAboutTooLargeDashedOrDottedRadius;
}
void SetHasWarnedAboutTooLargeDashedOrDottedRadius() {
mHasWarnedAboutTooLargeDashedOrDottedRadius = true;
}
nsBidi& GetBidiEngine();
gfxFontFeatureValueSet* GetFontFeatureValuesLookup() const {
return mFontFeatureValuesLookup;
}
protected:
friend class nsRunnableMethod<nsPresContext>;
void ThemeChangedInternal();
void SysColorChangedInternal();
void RefreshSystemMetrics();
// update device context's resolution from the widget
void UIResolutionChangedInternal();
// if aScale > 0.0, use it as resolution scale factor to the device context
// (otherwise get it from the widget)
void UIResolutionChangedInternalScale(double aScale);
// aData here is a pointer to a double that holds the CSS to device-pixel
// scale factor from the parent, which will be applied to the subdocument's
// device context instead of retrieving a scale from the widget.
static mozilla::CallState UIResolutionChangedSubdocumentCallback(
mozilla::dom::Document&, void* aData);
void SetImgAnimations(nsIContent* aParent, uint16_t aMode);
void SetSMILAnimations(mozilla::dom::Document* aDoc, uint16_t aNewMode,
uint16_t aOldMode);
static void PreferenceChanged(const char* aPrefName, void* aSelf);
void PreferenceChanged(const char* aPrefName);
void UpdateAfterPreferencesChanged();
void DispatchPrefChangedRunnableIfNeeded();
void GetUserPreferences();
void UpdateCharSet(NotNull<const Encoding*> aCharSet);
static mozilla::CallState NotifyDidPaintSubdocumentCallback(
mozilla::dom::Document&, void* aData);
static mozilla::CallState NotifyRevokingDidPaintSubdocumentCallback(
mozilla::dom::Document&, void* aData);
public:
// Used by the PresShell to force a reflow when some aspect of font info
// has been updated, potentially affecting font selection and layout.
void ForceReflowForFontInfoUpdate();
/**
* Checks for MozAfterPaint listeners on the document
*/
bool MayHavePaintEventListener();
/**
* Checks for MozAfterPaint listeners on the document and
* any subdocuments, except for subdocuments that are non-top-level
* content documents.
*/
bool MayHavePaintEventListenerInSubDocument();
void InvalidatePaintedLayers();
uint32_t GetNextFrameRateMultiplier() const {
return mNextFrameRateMultiplier;
}
void DidUseFrameRateMultiplier() {
if (!mNextFrameRateMultiplier) {
mNextFrameRateMultiplier = 1;
} else if (mNextFrameRateMultiplier < 8) {
mNextFrameRateMultiplier = mNextFrameRateMultiplier * 2;
}
}
protected:
// May be called multiple times (unlink, destructor)
void Destroy();
void AppUnitsPerDevPixelChanged();
bool HavePendingInputEvent();
// Creates a one-shot timer with the given aCallback & aDelay.
// Returns a refcounted pointer to the timer (or nullptr on failure).
already_AddRefed<nsITimer> CreateTimer(nsTimerCallbackFunc aCallback,
const char* aName, uint32_t aDelay);
struct TransactionInvalidations {
TransactionId mTransactionId;
nsTArray<nsRect> mInvalidations;
bool mIsWaitingForPreviousTransaction = false;
};
TransactionInvalidations* GetInvalidations(TransactionId aTransactionId);
// This should be called only when we update mVisibleArea or
// mDynamicToolbarMaxHeight or `app units per device pixels` changes.
void AdjustSizeForViewportUnits();
// IMPORTANT: The ownership implicit in the following member variables
// has been explicitly checked. If you add any members to this class,
// please make the ownership explicit (pinkerton, scc).
nsPresContextType mType;
// the PresShell owns a strong reference to the nsPresContext, and is
// responsible for nulling this pointer before it is destroyed
mozilla::PresShell* MOZ_NON_OWNING_REF mPresShell; // [WEAK]
RefPtr<mozilla::dom::Document> mDocument;
RefPtr<nsDeviceContext> mDeviceContext; // [STRONG] could be weak, but
// better safe than sorry.
// Cannot reintroduce cycles
// since there is no dependency
// from gfx back to layout.
RefPtr<mozilla::EventStateManager> mEventManager;
RefPtr<nsRefreshDriver> mRefreshDriver;
RefPtr<mozilla::AnimationEventDispatcher> mAnimationEventDispatcher;
RefPtr<mozilla::EffectCompositor> mEffectCompositor;
mozilla::UniquePtr<nsTransitionManager> mTransitionManager;
mozilla::UniquePtr<nsAnimationManager> mAnimationManager;
mozilla::UniquePtr<mozilla::RestyleManager> mRestyleManager;
RefPtr<mozilla::CounterStyleManager> mCounterStyleManager;
const nsStaticAtom* mMedium;
RefPtr<gfxFontFeatureValueSet> mFontFeatureValuesLookup;
// TODO(emilio): Maybe lazily create and put under a UniquePtr if this grows a
// lot?
MediaEmulationData mMediaEmulationData;
public:
// The following are public member variables so that we can use them
// with mozilla::AutoToggle or mozilla::AutoRestore.
// Should we disable font size inflation because we're inside of
// shrink-wrapping calculations on an inflation container?
bool mInflationDisabledForShrinkWrap;
protected:
float mSystemFontScale; // Internal text zoom factor, defaults to 1.0
float mTextZoom; // Text zoom, defaults to 1.0
float mEffectiveTextZoom; // Text zoom * system font scale
float mFullZoom; // Page zoom, defaults to 1.0
gfxSize mLastFontInflationScreenSize;
int32_t mCurAppUnitsPerDevPixel;
int32_t mAutoQualityMinFontSizePixelsPref;
nsCOMPtr<nsITheme> mTheme;
nsCOMPtr<nsIPrintSettings> mPrintSettings;
mozilla::UniquePtr<nsBidi> mBidiEngine;
AutoTArray<TransactionInvalidations, 4> mTransactions;
// text performance metrics
mozilla::UniquePtr<gfxTextPerfMetrics> mTextPerf;
mozilla::UniquePtr<gfxMissingFontRecorder> mMissingFonts;
nsRect mVisibleArea;
// This value is used to resolve viewport units.
// On mobile this size is including the dynamic toolbar maximum height below.
// On desktops this size is pretty much the same as |mVisibleArea|.
nsSize mSizeForViewportUnits;
// The maximum height of the dynamic toolbar on mobile.
mozilla::ScreenIntCoord mDynamicToolbarMaxHeight;
mozilla::ScreenIntCoord mDynamicToolbarHeight;
// Safe area insets support
mozilla::ScreenIntMargin mSafeAreaInsets;
nsSize mPageSize;
float mPageScale;
float mPPScale;
// This is a non-owning pointer. May be null. If non-null, it's guaranteed to
// be pointing to an element that's still alive, because we'll reset it in
// UpdateViewportScrollStylesOverride() as part of the cleanup code when
// this element is removed from the document. (For <body> and the root
// element, this call happens in nsCSSFrameConstructor::ContentRemoved(). For
// fullscreen elements, it happens in the fullscreen-specific cleanup invoked
// by Element::UnbindFromTree().)
mozilla::dom::Element* MOZ_NON_OWNING_REF mViewportScrollOverrideElement;
ScrollStyles mViewportScrollStyles;
bool mExistThrottledUpdates;
uint16_t mImageAnimationMode;
uint16_t mImageAnimationModePref;
uint32_t mInterruptChecksToSkip;
// During page load we use slower frame rate.
uint32_t mNextFrameRateMultiplier;
// Counters for tests and tools that want to detect frame construction
// or reflow.
uint64_t mElementsRestyled;
uint64_t mFramesConstructed;
uint64_t mFramesReflowed;
mozilla::TimeStamp mReflowStartTime;
mozilla::Maybe<TransactionId> mFirstContentfulPaintTransactionId;
// Time of various first interaction types, used to report time from
// first paint of the top level content pres shell to first interaction.
mozilla::TimeStamp mFirstNonBlankPaintTime;
mozilla::TimeStamp mFirstClickTime;
mozilla::TimeStamp mFirstKeyTime;
mozilla::TimeStamp mFirstMouseMoveTime;
mozilla::TimeStamp mFirstScrollTime;
bool mInteractionTimeEnabled;
// last time we did a full style flush
mozilla::TimeStamp mLastStyleUpdateForAllAnimations;
unsigned mHasPendingInterrupt : 1;
unsigned mPendingInterruptFromTest : 1;
unsigned mInterruptsEnabled : 1;
unsigned mSendAfterPaintToContent : 1;
unsigned mDrawImageBackground : 1;
unsigned mDrawColorBackground : 1;
unsigned mNeverAnimate : 1;
unsigned mPaginated : 1;
unsigned mCanPaginatedScroll : 1;
unsigned mDoScaledTwips : 1;
unsigned mIsRootPaginatedDocument : 1;
unsigned mPrefBidiDirection : 1;
unsigned mPrefScrollbarSide : 2;
unsigned mPendingSysColorChanged : 1;
unsigned mPendingThemeChanged : 1;
unsigned mPendingUIResolutionChanged : 1;
unsigned mPrefChangePendingNeedsReflow : 1;
unsigned mPostedPrefChangedRunnable : 1;
// Are we currently drawing an SVG glyph?
unsigned mIsGlyph : 1;
// Does the associated document use ex or ch units?
//
// TODO(emilio): It's a bit weird that this lives here but all the other
// relevant bits live in Device on the rust side.
unsigned mUsesExChUnits : 1;
// Is the current mCounterStyleManager valid?
unsigned mCounterStylesDirty : 1;
// Is the current mFontFeatureValuesLookup valid?
unsigned mFontFeatureValuesDirty : 1;
// resize reflow is suppressed when the only change has been to zoom
// the document rather than to change the document's dimensions
unsigned mSuppressResizeReflow : 1;
unsigned mIsVisual : 1;
// Should we paint flash in this context? Do not use this variable directly.
// Use GetPaintFlashing() method instead.
mutable unsigned mPaintFlashing : 1;
mutable unsigned mPaintFlashingInitialized : 1;
unsigned mHasWarnedAboutPositionedTableParts : 1;
unsigned mHasWarnedAboutTooLargeDashedOrDottedRadius : 1;
// Have we added quirk.css to the style set?
unsigned mQuirkSheetAdded : 1;
// Has NotifyNonBlankPaint been called on this PresContext?
unsigned mHadNonBlankPaint : 1;
// Has NotifyContentfulPaint been called on this PresContext?
unsigned mHadContentfulPaint : 1;
// Has NotifyDidPaintForSubtree been called for a contentful paint?
unsigned mHadContentfulPaintComposite : 1;
#ifdef DEBUG
unsigned mInitialized : 1;
#endif
mozilla::UniquePtr<mozilla::MediaFeatureChange>
mPendingMediaFeatureValuesChange;
protected:
virtual ~nsPresContext();
void LastRelease();
nsITheme* EnsureTheme();
#ifdef DEBUG
private:
friend struct nsAutoLayoutPhase;
mozilla::EnumeratedArray<nsLayoutPhase, nsLayoutPhase::COUNT, uint32_t>
mLayoutPhaseCount;
public:
uint32_t LayoutPhaseCount(nsLayoutPhase aPhase) {
return mLayoutPhaseCount[aPhase];
}
#endif
};
class nsRootPresContext final : public nsPresContext {
public:
nsRootPresContext(mozilla::dom::Document* aDocument, nsPresContextType aType);
virtual ~nsRootPresContext();
/**
* Registers a plugin to receive geometry updates (position and clip
* region) so it can update its widget.
* Callers must call UnregisterPluginForGeometryUpdates before
* the aPlugin frame is destroyed.
*/
void RegisterPluginForGeometryUpdates(nsIContent* aPlugin);
/**
* Stops a plugin receiving geometry updates (position and clip
* region). If the plugin was not already registered, this does
* nothing.
*/
void UnregisterPluginForGeometryUpdates(nsIContent* aPlugin);
bool NeedToComputePluginGeometryUpdates() {
return mRegisteredPlugins.Count() > 0;
}
/**
* Compute geometry updates for each plugin given that aList is the display
* list for aFrame. The updates are not yet applied;
* ApplyPluginGeometryUpdates is responsible for that. In the meantime they
* are stored on each nsPluginFrame.
* This needs to be called even when aFrame is a popup, since although
* windowed plugins aren't allowed in popups, windowless plugins are
* and ComputePluginGeometryUpdates needs to be called for them.
* aBuilder and aList can be null. This indicates that all plugins are
* hidden because we're in a background tab.
*/
void ComputePluginGeometryUpdates(nsIFrame* aFrame,
nsDisplayListBuilder* aBuilder,
nsDisplayList* aList);
/**
* Apply the stored plugin geometry updates. This should normally be called
* in DidPaint so the plugins are moved/clipped immediately after we've
* updated our window, so they look in sync with our window.
*/
void ApplyPluginGeometryUpdates();
/**
* Transfer stored plugin geometry updates to the compositor. Called during
* reflow, data is shipped over with layer updates. e10s specific.
*/
void CollectPluginGeometryUpdates(
mozilla::layers::LayerManager* aLayerManager);
virtual bool IsRoot() override { return true; }
/**
* Add a runnable that will get called before the next paint. They will get
* run eventually even if painting doesn't happen. They might run well before
* painting happens.
*/
void AddWillPaintObserver(nsIRunnable* aRunnable);
/**
* Run all runnables that need to get called before the next paint.
*/
void FlushWillPaintObservers();
virtual size_t SizeOfExcludingThis(
mozilla::MallocSizeOf aMallocSizeOf) const override;
protected:
/**
* Start a timer to ensure we eventually run ApplyPluginGeometryUpdates.
*/
void InitApplyPluginGeometryTimer();
/**
* Cancel the timer that ensures we eventually run ApplyPluginGeometryUpdates.
*/
void CancelApplyPluginGeometryTimer();
class RunWillPaintObservers : public mozilla::Runnable {
public:
explicit RunWillPaintObservers(nsRootPresContext* aPresContext)
: Runnable("nsPresContextType::RunWillPaintObservers"),
mPresContext(aPresContext) {}
void Revoke() { mPresContext = nullptr; }
NS_IMETHOD Run() override {
if (mPresContext) {
mPresContext->FlushWillPaintObservers();
}
return NS_OK;
}
// The lifetime of this reference is handled by an nsRevocableEventPtr
nsRootPresContext* MOZ_NON_OWNING_REF mPresContext;
};
friend class nsPresContext;
nsCOMPtr<nsITimer> mApplyPluginGeometryTimer;
nsTHashtable<nsRefPtrHashKey<nsIContent>> mRegisteredPlugins;
nsTArray<nsCOMPtr<nsIRunnable>> mWillPaintObservers;
nsRevocableEventPtr<RunWillPaintObservers> mWillPaintFallbackEvent;
};
#ifdef MOZ_REFLOW_PERF
# define DO_GLOBAL_REFLOW_COUNT(_name) \
aPresContext->CountReflows((_name), (nsIFrame*)this);
#else
# define DO_GLOBAL_REFLOW_COUNT(_name)
#endif // MOZ_REFLOW_PERF
#endif /* nsPresContext_h___ */
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