mirror of
https://github.com/classilla/tenfourfox.git
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2995 lines
123 KiB
C
2995 lines
123 KiB
C
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsLayoutUtils_h__
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#define nsLayoutUtils_h__
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/ArrayUtils.h"
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#include "mozilla/Maybe.h"
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#include "nsBoundingMetrics.h"
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#include "nsChangeHint.h"
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#include "nsAutoPtr.h"
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#include "nsFrameList.h"
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#include "mozilla/layout/FrameChildList.h"
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#include "nsThreadUtils.h"
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#include "nsIPrincipal.h"
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#include "nsCSSPseudoElements.h"
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#include "FrameMetrics.h"
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#include "nsIWidget.h"
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#include "nsCSSProperty.h"
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#include "nsStyleCoord.h"
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#include "nsStyleConsts.h"
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#include "nsGkAtoms.h"
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#include "nsRuleNode.h"
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#include "imgIContainer.h"
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#include "mozilla/gfx/2D.h"
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#include "Units.h"
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#include "mozilla/ToString.h"
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#include "nsHTMLReflowMetrics.h"
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#include "ImageContainer.h"
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#include <limits>
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#include <algorithm>
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class nsPresContext;
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class nsIContent;
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class nsIAtom;
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class nsIScrollableFrame;
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class nsIDOMEvent;
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class nsRegion;
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class nsDisplayListBuilder;
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class nsDisplayItem;
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class nsFontMetrics;
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class nsFontFaceList;
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class nsIImageLoadingContent;
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class nsStyleContext;
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class nsBlockFrame;
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class nsContainerFrame;
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class nsView;
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class nsIFrame;
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class nsStyleCoord;
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class nsStyleCorners;
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class gfxContext;
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class nsPIDOMWindow;
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class imgIRequest;
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class nsIDocument;
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struct gfxPoint;
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struct nsStyleFont;
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struct nsStyleImageOrientation;
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struct nsOverflowAreas;
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namespace mozilla {
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class EventListenerManager;
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class SVGImageContext;
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struct IntrinsicSize;
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struct ContainerLayerParameters;
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class WritingMode;
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namespace dom {
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class CanvasRenderingContext2D;
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class DOMRectList;
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class Element;
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class HTMLImageElement;
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class HTMLCanvasElement;
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class HTMLVideoElement;
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class Selection;
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} // namespace dom
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namespace gfx {
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struct RectCornerRadii;
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} // namespace gfx
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namespace layers {
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class Image;
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class Layer;
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} // namespace layers
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} // namespace mozilla
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namespace mozilla {
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struct DisplayPortPropertyData {
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DisplayPortPropertyData(const nsRect& aRect, uint32_t aPriority)
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: mRect(aRect)
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, mPriority(aPriority)
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{}
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nsRect mRect;
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uint32_t mPriority;
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};
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struct DisplayPortMarginsPropertyData {
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DisplayPortMarginsPropertyData(const ScreenMargin& aMargins,
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uint32_t aPriority)
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: mMargins(aMargins)
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, mPriority(aPriority)
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{}
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ScreenMargin mMargins;
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uint32_t mPriority;
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};
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} // namespace mozilla
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/**
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* nsLayoutUtils is a namespace class used for various helper
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* functions that are useful in multiple places in layout. The goal
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* is not to define multiple copies of the same static helper.
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*/
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class nsLayoutUtils
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{
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typedef mozilla::dom::DOMRectList DOMRectList;
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typedef mozilla::layers::Layer Layer;
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typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
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typedef mozilla::IntrinsicSize IntrinsicSize;
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typedef mozilla::gfx::SourceSurface SourceSurface;
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typedef mozilla::gfx::Color Color;
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typedef mozilla::gfx::DrawTarget DrawTarget;
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typedef mozilla::gfx::ExtendMode ExtendMode;
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typedef mozilla::gfx::Filter Filter;
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typedef mozilla::gfx::Float Float;
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typedef mozilla::gfx::Point Point;
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typedef mozilla::gfx::Rect Rect;
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typedef mozilla::gfx::RectDouble RectDouble;
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typedef mozilla::gfx::Matrix4x4 Matrix4x4;
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typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
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typedef mozilla::gfx::StrokeOptions StrokeOptions;
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typedef mozilla::image::DrawResult DrawResult;
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public:
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typedef mozilla::layers::FrameMetrics FrameMetrics;
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typedef FrameMetrics::ViewID ViewID;
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typedef mozilla::CSSPoint CSSPoint;
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typedef mozilla::CSSSize CSSSize;
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typedef mozilla::CSSIntSize CSSIntSize;
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typedef mozilla::ScreenMargin ScreenMargin;
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typedef mozilla::LayoutDeviceIntSize LayoutDeviceIntSize;
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/**
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* Finds previously assigned ViewID for the given content element, if any.
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* Returns whether a ViewID was previously assigned.
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*/
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static bool FindIDFor(const nsIContent* aContent, ViewID* aOutViewId);
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/**
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* Finds previously assigned or generates a unique ViewID for the given
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* content element.
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*/
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static ViewID FindOrCreateIDFor(nsIContent* aContent);
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/**
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* Find content for given ID.
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*/
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static nsIContent* FindContentFor(ViewID aId);
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/**
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* Find the scrollable frame for a given ID.
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*/
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static nsIScrollableFrame* FindScrollableFrameFor(ViewID aId);
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/**
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* Get display port for the given element.
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*/
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static bool GetDisplayPort(nsIContent* aContent, nsRect *aResult = nullptr);
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/**
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* @return the display port for the given element which should be used for
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* visibility testing purposes.
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*
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* If low-precision buffers are enabled, this is the critical display port;
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* otherwise, it's the same display port returned by GetDisplayPort().
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*/
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static bool GetDisplayPortForVisibilityTesting(nsIContent* aContent,
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nsRect* aResult = nullptr);
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enum class RepaintMode : uint8_t {
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Repaint,
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DoNotRepaint
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};
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/**
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* Set the display port margins for a content element to be used with a
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* display port base (see SetDisplayPortBase()).
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* See also nsIDOMWindowUtils.setDisplayPortMargins.
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* @param aContent the content element for which to set the margins
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* @param aPresShell the pres shell for the document containing the element
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* @param aMargins the margins to set
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* @param aAlignmentX, alignmentY the amount of pixels to which to align the
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* displayport built by combining the base
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* rect with the margins, in either direction
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* @param aPriority a priority value to determine which margins take effect
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* when multiple callers specify margins
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* @param aRepaintMode whether to schedule a paint after setting the margins
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* @return true if the new margins were applied.
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*/
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static bool SetDisplayPortMargins(nsIContent* aContent,
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nsIPresShell* aPresShell,
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const ScreenMargin& aMargins,
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uint32_t aPriority = 0,
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RepaintMode aRepaintMode = RepaintMode::Repaint);
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/**
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* Set the display port base rect for given element to be used with display
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* port margins.
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* SetDisplayPortBaseIfNotSet is like SetDisplayPortBase except it only sets
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* the display port base to aBase if no display port base is currently set.
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*/
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static void SetDisplayPortBase(nsIContent* aContent, const nsRect& aBase);
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static void SetDisplayPortBaseIfNotSet(nsIContent* aContent, const nsRect& aBase);
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/**
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* Get the critical display port for the given element.
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*/
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static bool GetCriticalDisplayPort(nsIContent* aContent, nsRect* aResult = nullptr);
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/**
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* Use heuristics to figure out the child list that
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* aChildFrame is currently in.
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*/
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static mozilla::layout::FrameChildListID GetChildListNameFor(nsIFrame* aChildFrame);
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/**
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* GetBeforeFrameForContent returns the ::before frame for aContent, if
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* one exists. This is typically O(1). The frame passed in must be
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* the first-in-flow.
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*
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* @param aGenConParentFrame an ancestor of the ::before frame
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* @param aContent the content whose ::before is wanted
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* @return the ::before frame or nullptr if there isn't one
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*/
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static nsIFrame* GetBeforeFrameForContent(nsIFrame* aGenConParentFrame,
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nsIContent* aContent);
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/**
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* GetBeforeFrame returns the outermost ::before frame of the given frame, if
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* one exists. This is typically O(1). The frame passed in must be
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* the first-in-flow.
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*
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* @param aFrame the frame whose ::before is wanted
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* @return the :before frame or nullptr if there isn't one
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*/
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static nsIFrame* GetBeforeFrame(nsIFrame* aFrame);
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/**
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* GetAfterFrameForContent returns the ::after frame for aContent, if one
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* exists. This will walk the in-flow chain of aGenConParentFrame to the
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* last-in-flow if needed. This function is typically O(N) in the number
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* of child frames, following in-flows, etc.
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*
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* @param aGenConParentFrame an ancestor of the ::after frame
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* @param aContent the content whose ::after is wanted
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* @return the ::after frame or nullptr if there isn't one
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*/
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static nsIFrame* GetAfterFrameForContent(nsIFrame* aGenConParentFrame,
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nsIContent* aContent);
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/**
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* GetAfterFrame returns the outermost ::after frame of the given frame, if one
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* exists. This will walk the in-flow chain to the last-in-flow if
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* needed. This function is typically O(N) in the number of child
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* frames, following in-flows, etc.
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*
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* @param aFrame the frame whose ::after is wanted
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* @return the :after frame or nullptr if there isn't one
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*/
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static nsIFrame* GetAfterFrame(nsIFrame* aFrame);
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/**
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* Given a frame, search up the frame tree until we find an
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* ancestor that (or the frame itself) is of type aFrameType, if any.
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*
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* @param aFrame the frame to start at
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* @param aFrameType the frame type to look for
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* @param aStopAt a frame to stop at after we checked it
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* @return a frame of the given type or nullptr if no
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* such ancestor exists
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*/
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static nsIFrame* GetClosestFrameOfType(nsIFrame* aFrame,
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nsIAtom* aFrameType,
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nsIFrame* aStopAt = nullptr);
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/**
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* Given a frame, search up the frame tree until we find an
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* ancestor that (or the frame itself) is a "Page" frame, if any.
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*
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* @param aFrame the frame to start at
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* @return a frame of type nsGkAtoms::pageFrame or nullptr if no
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* such ancestor exists
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*/
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static nsIFrame* GetPageFrame(nsIFrame* aFrame)
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{
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return GetClosestFrameOfType(aFrame, nsGkAtoms::pageFrame);
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}
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/**
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* Given a frame which is the primary frame for an element,
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* return the frame that has the non-psuedoelement style context for
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* the content.
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* This is aPrimaryFrame itself except for tableOuter frames.
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*/
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static nsIFrame* GetStyleFrame(nsIFrame* aPrimaryFrame);
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/**
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* Given a content node,
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* return the frame that has the non-psuedoelement style context for
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* the content. May return null.
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* This is aContent->GetPrimaryFrame() except for tableOuter frames.
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*/
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static nsIFrame* GetStyleFrame(const nsIContent* aContent);
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/**
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* IsGeneratedContentFor returns true if aFrame is the outermost
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* frame for generated content of type aPseudoElement for aContent.
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* aFrame *might not* have the aPseudoElement pseudo-style! For example
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* it might be a table outer frame and the inner table frame might
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* have the pseudo-style.
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*
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* @param aContent the content node we're looking at. If this is
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* null, then we just assume that aFrame has the right content
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* pointer.
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* @param aFrame the frame we're looking at
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* @param aPseudoElement the pseudo type we're interested in
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* @return whether aFrame is the generated aPseudoElement frame for aContent
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*/
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static bool IsGeneratedContentFor(nsIContent* aContent, nsIFrame* aFrame,
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nsIAtom* aPseudoElement);
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#ifdef DEBUG
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// TODO: remove, see bug 598468.
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static bool gPreventAssertInCompareTreePosition;
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#endif // DEBUG
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/**
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* CompareTreePosition determines whether aContent1 comes before or
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* after aContent2 in a preorder traversal of the content tree.
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*
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* @param aCommonAncestor either null, or a common ancestor of
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* aContent1 and aContent2. Actually this is
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* only a hint; if it's not an ancestor of
|
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* aContent1 or aContent2, this function will
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* still work, but it will be slower than
|
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* normal.
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* @return < 0 if aContent1 is before aContent2
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* > 0 if aContent1 is after aContent2,
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* 0 otherwise (meaning they're the same, or they're in
|
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* different documents)
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*/
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static int32_t CompareTreePosition(nsIContent* aContent1,
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nsIContent* aContent2,
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const nsIContent* aCommonAncestor = nullptr)
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{
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return DoCompareTreePosition(aContent1, aContent2, -1, 1, aCommonAncestor);
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}
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/*
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* More generic version of |CompareTreePosition|. |aIf1Ancestor|
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* gives the value to return when 1 is an ancestor of 2, and likewise
|
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* for |aIf2Ancestor|. Passing (-1, 1) gives preorder traversal
|
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* order, and (1, -1) gives postorder traversal order.
|
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*/
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static int32_t DoCompareTreePosition(nsIContent* aContent1,
|
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nsIContent* aContent2,
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int32_t aIf1Ancestor,
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int32_t aIf2Ancestor,
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const nsIContent* aCommonAncestor = nullptr);
|
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|
|
||
|
/**
|
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|
* CompareTreePosition determines whether aFrame1 comes before or
|
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|
* after aFrame2 in a preorder traversal of the frame tree, where out
|
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* of flow frames are treated as children of their placeholders. This is
|
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* basically the same ordering as DoCompareTreePosition(nsIContent*) except
|
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|
* that it handles anonymous content properly and there are subtleties with
|
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|
* continuations.
|
||
|
*
|
||
|
* @param aCommonAncestor either null, or a common ancestor of
|
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|
* aContent1 and aContent2. Actually this is
|
||
|
* only a hint; if it's not an ancestor of
|
||
|
* aContent1 or aContent2, this function will
|
||
|
* still work, but it will be slower than
|
||
|
* normal.
|
||
|
* @return < 0 if aContent1 is before aContent2
|
||
|
* > 0 if aContent1 is after aContent2,
|
||
|
* 0 otherwise (meaning they're the same, or they're in
|
||
|
* different frame trees)
|
||
|
*/
|
||
|
static int32_t CompareTreePosition(nsIFrame* aFrame1,
|
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|
nsIFrame* aFrame2,
|
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|
nsIFrame* aCommonAncestor = nullptr)
|
||
|
{
|
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return DoCompareTreePosition(aFrame1, aFrame2, -1, 1, aCommonAncestor);
|
||
|
}
|
||
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|
||
|
static int32_t CompareTreePosition(nsIFrame* aFrame1,
|
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|
nsIFrame* aFrame2,
|
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|
nsTArray<nsIFrame*>& aFrame2Ancestors,
|
||
|
nsIFrame* aCommonAncestor = nullptr)
|
||
|
{
|
||
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return DoCompareTreePosition(aFrame1, aFrame2, aFrame2Ancestors,
|
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|
-1, 1, aCommonAncestor);
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* More generic version of |CompareTreePosition|. |aIf1Ancestor|
|
||
|
* gives the value to return when 1 is an ancestor of 2, and likewise
|
||
|
* for |aIf2Ancestor|. Passing (-1, 1) gives preorder traversal
|
||
|
* order, and (1, -1) gives postorder traversal order.
|
||
|
*/
|
||
|
static int32_t DoCompareTreePosition(nsIFrame* aFrame1,
|
||
|
nsIFrame* aFrame2,
|
||
|
int32_t aIf1Ancestor,
|
||
|
int32_t aIf2Ancestor,
|
||
|
nsIFrame* aCommonAncestor = nullptr);
|
||
|
|
||
|
static nsIFrame* FillAncestors(nsIFrame* aFrame,
|
||
|
nsIFrame* aStopAtAncestor,
|
||
|
nsTArray<nsIFrame*>* aAncestors);
|
||
|
|
||
|
static int32_t DoCompareTreePosition(nsIFrame* aFrame1,
|
||
|
nsIFrame* aFrame2,
|
||
|
nsTArray<nsIFrame*>& aFrame2Ancestors,
|
||
|
int32_t aIf1Ancestor,
|
||
|
int32_t aIf2Ancestor,
|
||
|
nsIFrame* aCommonAncestor);
|
||
|
|
||
|
/**
|
||
|
* LastContinuationWithChild gets the last continuation in aFrame's chain
|
||
|
* that has a child, or the first continuation if the frame has no children.
|
||
|
*/
|
||
|
static nsContainerFrame* LastContinuationWithChild(nsContainerFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* GetLastSibling simply finds the last sibling of aFrame, or returns nullptr if
|
||
|
* aFrame is null.
|
||
|
*/
|
||
|
static nsIFrame* GetLastSibling(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* FindSiblingViewFor locates the child of aParentView that aFrame's
|
||
|
* view should be inserted 'above' (i.e., before in sibling view
|
||
|
* order). This is the first child view of aParentView whose
|
||
|
* corresponding content is before aFrame's content (view siblings
|
||
|
* are in reverse content order).
|
||
|
*/
|
||
|
static nsView* FindSiblingViewFor(nsView* aParentView, nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the parent of aFrame. If aFrame is the root frame for a document,
|
||
|
* and the document has a parent document in the same view hierarchy, then
|
||
|
* we try to return the subdocumentframe in the parent document.
|
||
|
* @param aExtraOffset [in/out] if non-null, then as we cross documents
|
||
|
* an extra offset may be required and it will be added to aCrossDocOffset.
|
||
|
* Be careful dealing with this extra offset as it is in app units of the
|
||
|
* parent document, which may have a different app units per dev pixel ratio
|
||
|
* than the child document.
|
||
|
*/
|
||
|
static nsIFrame* GetCrossDocParentFrame(const nsIFrame* aFrame,
|
||
|
nsPoint* aCrossDocOffset = nullptr);
|
||
|
|
||
|
/**
|
||
|
* IsProperAncestorFrame checks whether aAncestorFrame is an ancestor
|
||
|
* of aFrame and not equal to aFrame.
|
||
|
* @param aCommonAncestor nullptr, or a common ancestor of aFrame and
|
||
|
* aAncestorFrame. If non-null, this can bound the search and speed up
|
||
|
* the function
|
||
|
*/
|
||
|
static bool IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
|
||
|
nsIFrame* aCommonAncestor = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Like IsProperAncestorFrame, but looks across document boundaries.
|
||
|
*
|
||
|
* Just like IsAncestorFrameCrossDoc, except that it returns false when
|
||
|
* aFrame == aAncestorFrame.
|
||
|
*/
|
||
|
static bool IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
|
||
|
nsIFrame* aCommonAncestor = nullptr);
|
||
|
|
||
|
/**
|
||
|
* IsAncestorFrameCrossDoc checks whether aAncestorFrame is an ancestor
|
||
|
* of aFrame or equal to aFrame, looking across document boundaries.
|
||
|
* @param aCommonAncestor nullptr, or a common ancestor of aFrame and
|
||
|
* aAncestorFrame. If non-null, this can bound the search and speed up
|
||
|
* the function.
|
||
|
*
|
||
|
* Just like IsProperAncestorFrameCrossDoc, except that it returns true when
|
||
|
* aFrame == aAncestorFrame.
|
||
|
*/
|
||
|
static bool IsAncestorFrameCrossDoc(const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
|
||
|
const nsIFrame* aCommonAncestor = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Sets the fixed-pos metadata properties on aLayer.
|
||
|
* aAnchorRect is the basic anchor rectangle. If aFixedPosFrame is not a viewport
|
||
|
* frame, then we pick a corner of aAnchorRect to as the anchor point for the
|
||
|
* fixed-pos layer (i.e. the point to remain stable during zooming), based
|
||
|
* on which of the fixed-pos frame's CSS absolute positioning offset
|
||
|
* properties (top, left, right, bottom) are auto. aAnchorRect is in the
|
||
|
* coordinate space of aLayer's container layer (i.e. relative to the reference
|
||
|
* frame of the display item which is building aLayer's container layer).
|
||
|
* aIsClipFixed is true if the layer's clip rect should also remain fixed
|
||
|
* during async-scrolling (true for fixed position elements, false for
|
||
|
* fixed backgrounds).
|
||
|
*/
|
||
|
static void SetFixedPositionLayerData(Layer* aLayer, const nsIFrame* aViewportFrame,
|
||
|
const nsRect& aAnchorRect,
|
||
|
const nsIFrame* aFixedPosFrame,
|
||
|
nsPresContext* aPresContext,
|
||
|
const ContainerLayerParameters& aContainerParameters,
|
||
|
bool aIsClipFixed);
|
||
|
|
||
|
/**
|
||
|
* Return true if aPresContext's viewport has a displayport.
|
||
|
* Fills in aDisplayPort with the displayport rectangle if non-null.
|
||
|
*/
|
||
|
static bool ViewportHasDisplayPort(nsPresContext* aPresContext,
|
||
|
nsRect* aDisplayPort = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Return true if aFrame is a fixed-pos frame and is a child of a viewport
|
||
|
* which has a displayport. These frames get special treatment from the compositor.
|
||
|
* aDisplayPort, if non-null, is set to the display port rectangle (relative to
|
||
|
* the viewport).
|
||
|
*/
|
||
|
static bool IsFixedPosFrameInDisplayPort(const nsIFrame* aFrame,
|
||
|
nsRect* aDisplayPort = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Store whether aThumbFrame wants its own layer. This sets a property on
|
||
|
* the frame.
|
||
|
*/
|
||
|
static void SetScrollbarThumbLayerization(nsIFrame* aThumbFrame, bool aLayerize);
|
||
|
|
||
|
/**
|
||
|
* Returns whether aThumbFrame wants its own layer due to having called
|
||
|
* SetScrollbarThumbLayerization.
|
||
|
*/
|
||
|
static bool IsScrollbarThumbLayerized(nsIFrame* aThumbFrame);
|
||
|
|
||
|
/**
|
||
|
* GetScrollableFrameFor returns the scrollable frame for a scrolled frame
|
||
|
*/
|
||
|
static nsIScrollableFrame* GetScrollableFrameFor(const nsIFrame *aScrolledFrame);
|
||
|
|
||
|
/**
|
||
|
* GetNearestScrollableFrameForDirection locates the first ancestor of
|
||
|
* aFrame (or aFrame itself) that is scrollable with overflow:scroll or
|
||
|
* overflow:auto in the given direction and where either the scrollbar for
|
||
|
* that direction is visible or the frame can be scrolled by some
|
||
|
* positive amount in that direction.
|
||
|
* The search extends across document boundaries.
|
||
|
*
|
||
|
* @param aFrame the frame to start with
|
||
|
* @param aDirection Whether it's for horizontal or vertical scrolling.
|
||
|
* @return the nearest scrollable frame or nullptr if not found
|
||
|
*/
|
||
|
enum Direction { eHorizontal, eVertical };
|
||
|
static nsIScrollableFrame* GetNearestScrollableFrameForDirection(nsIFrame* aFrame,
|
||
|
Direction aDirection);
|
||
|
|
||
|
enum {
|
||
|
/**
|
||
|
* If the SCROLLABLE_SAME_DOC flag is set, then we only walk the frame tree
|
||
|
* up to the root frame in the current document.
|
||
|
*/
|
||
|
SCROLLABLE_SAME_DOC = 0x01,
|
||
|
/**
|
||
|
* If the SCROLLABLE_INCLUDE_HIDDEN flag is set then we allow
|
||
|
* overflow:hidden scrollframes to be returned as scrollable frames.
|
||
|
*/
|
||
|
SCROLLABLE_INCLUDE_HIDDEN = 0x02,
|
||
|
/**
|
||
|
* If the SCROLLABLE_ONLY_ASYNC_SCROLLABLE flag is set, then we only
|
||
|
* want to match scrollable frames for which WantAsyncScroll() returns
|
||
|
* true.
|
||
|
*/
|
||
|
SCROLLABLE_ONLY_ASYNC_SCROLLABLE = 0x04,
|
||
|
/**
|
||
|
* If the SCROLLABLE_ALWAYS_MATCH_ROOT flag is set, then we will always
|
||
|
* return the root scrollable frame for the root document (in the current
|
||
|
* process) if we encounter it, whether or not it is async scrollable or
|
||
|
* overflow: hidden.
|
||
|
*/
|
||
|
SCROLLABLE_ALWAYS_MATCH_ROOT = 0x08,
|
||
|
/**
|
||
|
* If the SCROLLABLE_FIXEDPOS_FINDS_ROOT flag is set, then for fixed-pos
|
||
|
* frames that are in the root document (in the current process) return the
|
||
|
* root scrollable frame for that document.
|
||
|
*/
|
||
|
SCROLLABLE_FIXEDPOS_FINDS_ROOT = 0x10
|
||
|
};
|
||
|
/**
|
||
|
* GetNearestScrollableFrame locates the first ancestor of aFrame
|
||
|
* (or aFrame itself) that is scrollable with overflow:scroll or
|
||
|
* overflow:auto in some direction.
|
||
|
*
|
||
|
* @param aFrame the frame to start with
|
||
|
* @param aFlags if SCROLLABLE_SAME_DOC is set, do not search across
|
||
|
* document boundaries. If SCROLLABLE_INCLUDE_HIDDEN is set, include
|
||
|
* frames scrollable with overflow:hidden.
|
||
|
* @return the nearest scrollable frame or nullptr if not found
|
||
|
*/
|
||
|
static nsIScrollableFrame* GetNearestScrollableFrame(nsIFrame* aFrame,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* GetScrolledRect returns the range of allowable scroll offsets
|
||
|
* for aScrolledFrame, assuming the scrollable overflow area is
|
||
|
* aScrolledFrameOverflowArea and the scrollport size is aScrollPortSize.
|
||
|
* aDirection is either NS_STYLE_DIRECTION_LTR or NS_STYLE_DIRECTION_RTL.
|
||
|
*/
|
||
|
static nsRect GetScrolledRect(nsIFrame* aScrolledFrame,
|
||
|
const nsRect& aScrolledFrameOverflowArea,
|
||
|
const nsSize& aScrollPortSize,
|
||
|
uint8_t aDirection);
|
||
|
|
||
|
/**
|
||
|
* HasPseudoStyle returns true if aContent (whose primary style
|
||
|
* context is aStyleContext) has the aPseudoElement pseudo-style
|
||
|
* attached to it; returns false otherwise.
|
||
|
*
|
||
|
* @param aContent the content node we're looking at
|
||
|
* @param aStyleContext aContent's style context
|
||
|
* @param aPseudoElement the id of the pseudo style we care about
|
||
|
* @param aPresContext the presentation context
|
||
|
* @return whether aContent has aPseudoElement style attached to it
|
||
|
*/
|
||
|
static bool HasPseudoStyle(nsIContent* aContent,
|
||
|
nsStyleContext* aStyleContext,
|
||
|
nsCSSPseudoElements::Type aPseudoElement,
|
||
|
nsPresContext* aPresContext);
|
||
|
|
||
|
/**
|
||
|
* If this frame is a placeholder for a float, then return the float,
|
||
|
* otherwise return nullptr. aPlaceholder must be a placeholder frame.
|
||
|
*/
|
||
|
static nsIFrame* GetFloatFromPlaceholder(nsIFrame* aPlaceholder);
|
||
|
|
||
|
// Combine aNewBreakType with aOrigBreakType, but limit the break types
|
||
|
// to NS_STYLE_CLEAR_LEFT, RIGHT, LEFT_AND_RIGHT.
|
||
|
static uint8_t CombineBreakType(uint8_t aOrigBreakType, uint8_t aNewBreakType);
|
||
|
|
||
|
/**
|
||
|
* Get the coordinates of a given DOM mouse event, relative to a given
|
||
|
* frame. Works only for DOM events generated by WidgetGUIEvents.
|
||
|
* @param aDOMEvent the event
|
||
|
* @param aFrame the frame to make coordinates relative to
|
||
|
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
|
||
|
* for some reason the coordinates for the mouse are not known (e.g.,
|
||
|
* the event is not a GUI event).
|
||
|
*/
|
||
|
static nsPoint GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent,
|
||
|
nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the coordinates of a given native mouse event, relative to a given
|
||
|
* frame.
|
||
|
* @param aEvent the event
|
||
|
* @param aFrame the frame to make coordinates relative to
|
||
|
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
|
||
|
* for some reason the coordinates for the mouse are not known (e.g.,
|
||
|
* the event is not a GUI event).
|
||
|
*/
|
||
|
static nsPoint GetEventCoordinatesRelativeTo(
|
||
|
const mozilla::WidgetEvent* aEvent,
|
||
|
nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the coordinates of a given point relative to an event and a
|
||
|
* given frame.
|
||
|
* @param aEvent the event
|
||
|
* @param aPoint the point to get the coordinates relative to
|
||
|
* @param aFrame the frame to make coordinates relative to
|
||
|
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
|
||
|
* for some reason the coordinates for the mouse are not known (e.g.,
|
||
|
* the event is not a GUI event).
|
||
|
*/
|
||
|
static nsPoint GetEventCoordinatesRelativeTo(
|
||
|
const mozilla::WidgetEvent* aEvent,
|
||
|
const mozilla::LayoutDeviceIntPoint& aPoint,
|
||
|
nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the coordinates of a given point relative to a widget and a
|
||
|
* given frame.
|
||
|
* @param aWidget the event src widget
|
||
|
* @param aPoint the point to get the coordinates relative to
|
||
|
* @param aFrame the frame to make coordinates relative to
|
||
|
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
|
||
|
* for some reason the coordinates for the mouse are not known (e.g.,
|
||
|
* the event is not a GUI event).
|
||
|
*/
|
||
|
static nsPoint GetEventCoordinatesRelativeTo(nsIWidget* aWidget,
|
||
|
const mozilla::LayoutDeviceIntPoint& aPoint,
|
||
|
nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the popup frame of a given native mouse event.
|
||
|
* @param aPresContext only check popups within aPresContext or a descendant
|
||
|
* @param aEvent the event.
|
||
|
* @return Null, if there is no popup frame at the point, otherwise,
|
||
|
* returns top-most popup frame at the point.
|
||
|
*/
|
||
|
static nsIFrame* GetPopupFrameForEventCoordinates(
|
||
|
nsPresContext* aPresContext,
|
||
|
const mozilla::WidgetEvent* aEvent);
|
||
|
|
||
|
/**
|
||
|
* Translate from widget coordinates to the view's coordinates
|
||
|
* @param aPresContext the PresContext for the view
|
||
|
* @param aWidget the widget
|
||
|
* @param aPt the point relative to the widget
|
||
|
* @param aView view to which returned coordinates are relative
|
||
|
* @return the point in the view's coordinates
|
||
|
*/
|
||
|
static nsPoint TranslateWidgetToView(nsPresContext* aPresContext,
|
||
|
nsIWidget* aWidget,
|
||
|
const mozilla::LayoutDeviceIntPoint& aPt,
|
||
|
nsView* aView);
|
||
|
|
||
|
/**
|
||
|
* Translate from view coordinates to the widget's coordinates.
|
||
|
* @param aPresContext the PresContext for the view
|
||
|
* @param aView the view
|
||
|
* @param aPt the point relative to the view
|
||
|
* @param aWidget the widget to which returned coordinates are relative
|
||
|
* @return the point in the view's coordinates
|
||
|
*/
|
||
|
static mozilla::LayoutDeviceIntPoint
|
||
|
TranslateViewToWidget(nsPresContext* aPresContext,
|
||
|
nsView* aView, nsPoint aPt,
|
||
|
nsIWidget* aWidget);
|
||
|
|
||
|
enum FrameForPointFlags {
|
||
|
/**
|
||
|
* When set, paint suppression is ignored, so we'll return non-root page
|
||
|
* elements even if paint suppression is stopping them from painting.
|
||
|
*/
|
||
|
IGNORE_PAINT_SUPPRESSION = 0x01,
|
||
|
/**
|
||
|
* When set, clipping due to the root scroll frame (and any other viewport-
|
||
|
* related clipping) is ignored.
|
||
|
*/
|
||
|
IGNORE_ROOT_SCROLL_FRAME = 0x02,
|
||
|
/**
|
||
|
* When set, return only content in the same document as aFrame.
|
||
|
*/
|
||
|
IGNORE_CROSS_DOC = 0x04
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Given aFrame, the root frame of a stacking context, find its descendant
|
||
|
* frame under the point aPt that receives a mouse event at that location,
|
||
|
* or nullptr if there is no such frame.
|
||
|
* @param aPt the point, relative to the frame origin
|
||
|
* @param aFlags some combination of FrameForPointFlags
|
||
|
*/
|
||
|
static nsIFrame* GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* Given aFrame, the root frame of a stacking context, find all descendant
|
||
|
* frames under the area of a rectangle that receives a mouse event,
|
||
|
* or nullptr if there is no such frame.
|
||
|
* @param aRect the rect, relative to the frame origin
|
||
|
* @param aOutFrames an array to add all the frames found
|
||
|
* @param aFlags some combination of FrameForPointFlags
|
||
|
*/
|
||
|
static nsresult GetFramesForArea(nsIFrame* aFrame, const nsRect& aRect,
|
||
|
nsTArray<nsIFrame*> &aOutFrames,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* Transform aRect relative to aFrame up to the coordinate system of
|
||
|
* aAncestor. Computes the bounding-box of the true quadrilateral.
|
||
|
* Pass non-null aPreservesAxisAlignedRectangles and it will be set to true if
|
||
|
* we only need to use a 2d transform that PreservesAxisAlignedRectangles().
|
||
|
*/
|
||
|
static nsRect TransformFrameRectToAncestor(nsIFrame* aFrame,
|
||
|
const nsRect& aRect,
|
||
|
const nsIFrame* aAncestor,
|
||
|
bool* aPreservesAxisAlignedRectangles = nullptr);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Gets the transform for aFrame relative to aAncestor. Pass null for
|
||
|
* aAncestor to go up to the root frame.
|
||
|
*/
|
||
|
static Matrix4x4 GetTransformToAncestor(nsIFrame *aFrame, const nsIFrame *aAncestor);
|
||
|
|
||
|
/**
|
||
|
* Gets the scale factors of the transform for aFrame relative to the root
|
||
|
* frame if this transform is 2D, or the identity scale factors otherwise.
|
||
|
*/
|
||
|
static gfxSize GetTransformToAncestorScale(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Gets the scale factors of the transform for aFrame relative to the root
|
||
|
* frame if this transform is 2D, or the identity scale factors otherwise.
|
||
|
* If some frame on the path from aFrame to the display root frame may have an
|
||
|
* animated scale, returns the identity scale factors.
|
||
|
*/
|
||
|
static gfxSize GetTransformToAncestorScaleExcludingAnimated(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Find the nearest common ancestor frame for aFrame1 and aFrame2. The
|
||
|
* ancestor frame could be cross-doc.
|
||
|
*/
|
||
|
static nsIFrame* FindNearestCommonAncestorFrame(nsIFrame* aFrame1,
|
||
|
nsIFrame* aFrame2);
|
||
|
|
||
|
/**
|
||
|
* Transforms a list of CSSPoints from aFromFrame to aToFrame, taking into
|
||
|
* account all relevant transformations on the frames up to (but excluding)
|
||
|
* their nearest common ancestor.
|
||
|
* If we encounter a transform that we need to invert but which is
|
||
|
* non-invertible, we return NONINVERTIBLE_TRANSFORM. If the frames have
|
||
|
* no common ancestor, we return NO_COMMON_ANCESTOR.
|
||
|
* If this returns TRANSFORM_SUCCEEDED, the points in aPoints are transformed
|
||
|
* in-place, otherwise they are untouched.
|
||
|
*/
|
||
|
enum TransformResult {
|
||
|
TRANSFORM_SUCCEEDED,
|
||
|
NO_COMMON_ANCESTOR,
|
||
|
NONINVERTIBLE_TRANSFORM
|
||
|
};
|
||
|
static TransformResult TransformPoints(nsIFrame* aFromFrame, nsIFrame* aToFrame,
|
||
|
uint32_t aPointCount, CSSPoint* aPoints);
|
||
|
|
||
|
/**
|
||
|
* Same as above function, but transform points in app units and
|
||
|
* handle 1 point per call.
|
||
|
*/
|
||
|
static TransformResult TransformPoint(nsIFrame* aFromFrame, nsIFrame* aToFrame,
|
||
|
nsPoint& aPoint);
|
||
|
|
||
|
/**
|
||
|
* Transforms a rect from aFromFrame to aToFrame. In app units.
|
||
|
* Returns the bounds of the actual rect if the transform requires rotation
|
||
|
* or anything complex like that.
|
||
|
*/
|
||
|
static TransformResult TransformRect(nsIFrame* aFromFrame, nsIFrame* aToFrame,
|
||
|
nsRect& aRect);
|
||
|
|
||
|
/**
|
||
|
* Get the border-box of aElement's primary frame, transformed it to be
|
||
|
* relative to aFrame.
|
||
|
*/
|
||
|
static nsRect GetRectRelativeToFrame(mozilla::dom::Element* aElement,
|
||
|
nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Returns true if aRect with border inflation of size aInflateSize contains
|
||
|
* aPoint.
|
||
|
*/
|
||
|
static bool ContainsPoint(const nsRect& aRect, const nsPoint& aPoint,
|
||
|
nscoord aInflateSize);
|
||
|
|
||
|
/**
|
||
|
* Check whether aRect is visible in the boundary of the scroll frames
|
||
|
* boundary.
|
||
|
*/
|
||
|
static bool IsRectVisibleInScrollFrames(nsIFrame* aFrame,
|
||
|
const nsRect& aRect);
|
||
|
|
||
|
/**
|
||
|
* Clamp aRect relative to aFrame to the scroll frames boundary searching from
|
||
|
* aFrame.
|
||
|
*/
|
||
|
static nsRect ClampRectToScrollFrames(nsIFrame* aFrame,
|
||
|
const nsRect& aRect);
|
||
|
|
||
|
/**
|
||
|
* Return true if a "layer transform" could be computed for aFrame,
|
||
|
* and optionally return the computed transform. The returned
|
||
|
* transform is what would be set on the layer currently if a layers
|
||
|
* transaction were opened at the time this helper is called.
|
||
|
*/
|
||
|
static bool GetLayerTransformForFrame(nsIFrame* aFrame,
|
||
|
Matrix4x4* aTransform);
|
||
|
|
||
|
/**
|
||
|
* Given a point in the global coordinate space, returns that point expressed
|
||
|
* in the coordinate system of aFrame. This effectively inverts all
|
||
|
* transforms between this point and the root frame.
|
||
|
*
|
||
|
* @param aFrame The frame that acts as the coordinate space container.
|
||
|
* @param aPoint The point, in the global space, to get in the frame-local space.
|
||
|
* @return aPoint, expressed in aFrame's canonical coordinate space.
|
||
|
*/
|
||
|
static nsPoint TransformRootPointToFrame(nsIFrame* aFrame,
|
||
|
const nsPoint &aPoint)
|
||
|
{
|
||
|
return TransformAncestorPointToFrame(aFrame, aPoint, nullptr);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Transform aPoint relative to aAncestor down to the coordinate system of
|
||
|
* aFrame.
|
||
|
*/
|
||
|
static nsPoint TransformAncestorPointToFrame(nsIFrame* aFrame,
|
||
|
const nsPoint& aPoint,
|
||
|
nsIFrame* aAncestor);
|
||
|
|
||
|
/**
|
||
|
* Helper function that, given a rectangle and a matrix, returns the smallest
|
||
|
* rectangle containing the image of the source rectangle.
|
||
|
*
|
||
|
* @param aBounds The rectangle to transform.
|
||
|
* @param aMatrix The matrix to transform it with.
|
||
|
* @param aFactor The number of app units per graphics unit.
|
||
|
* @return The smallest rect that contains the image of aBounds.
|
||
|
*/
|
||
|
static nsRect MatrixTransformRect(const nsRect &aBounds,
|
||
|
const Matrix4x4 &aMatrix, float aFactor);
|
||
|
|
||
|
/**
|
||
|
* Helper function that, given a rectangle and a matrix, returns the smallest
|
||
|
* rectangle containing the image of the source rectangle rounded out to the nearest
|
||
|
* pixel value.
|
||
|
*
|
||
|
* @param aBounds The rectangle to transform.
|
||
|
* @param aMatrix The matrix to transform it with.
|
||
|
* @param aFactor The number of app units per graphics unit.
|
||
|
* @return The smallest rect that contains the image of aBounds.
|
||
|
*/
|
||
|
static nsRect MatrixTransformRectOut(const nsRect &aBounds,
|
||
|
const Matrix4x4 &aMatrix, float aFactor);
|
||
|
/**
|
||
|
* Helper function that, given a point and a matrix, returns the image
|
||
|
* of that point under the matrix transform.
|
||
|
*
|
||
|
* @param aPoint The point to transform.
|
||
|
* @param aMatrix The matrix to transform it with.
|
||
|
* @param aFactor The number of app units per graphics unit.
|
||
|
* @return The image of the point under the transform.
|
||
|
*/
|
||
|
static nsPoint MatrixTransformPoint(const nsPoint &aPoint,
|
||
|
const Matrix4x4 &aMatrix, float aFactor);
|
||
|
|
||
|
/**
|
||
|
* Given a graphics rectangle in graphics space, return a rectangle in
|
||
|
* app space that contains the graphics rectangle, rounding out as necessary.
|
||
|
*
|
||
|
* @param aRect The graphics rect to round outward.
|
||
|
* @param aFactor The number of app units per graphics unit.
|
||
|
* @return The smallest rectangle in app space that contains aRect.
|
||
|
*/
|
||
|
static nsRect RoundGfxRectToAppRect(const Rect &aRect, float aFactor);
|
||
|
|
||
|
/**
|
||
|
* Given a graphics rectangle in graphics space, return a rectangle in
|
||
|
* app space that contains the graphics rectangle, rounding out as necessary.
|
||
|
*
|
||
|
* @param aRect The graphics rect to round outward.
|
||
|
* @param aFactor The number of app units per graphics unit.
|
||
|
* @return The smallest rectangle in app space that contains aRect.
|
||
|
*/
|
||
|
static nsRect RoundGfxRectToAppRect(const gfxRect &aRect, float aFactor);
|
||
|
|
||
|
/**
|
||
|
* Returns a subrectangle of aContainedRect that is entirely inside the rounded
|
||
|
* rect. Complex cases are handled conservatively by returning a smaller
|
||
|
* rect than necessary.
|
||
|
*/
|
||
|
static nsRegion RoundedRectIntersectRect(const nsRect& aRoundedRect,
|
||
|
const nscoord aRadii[8],
|
||
|
const nsRect& aContainedRect);
|
||
|
static nsIntRegion RoundedRectIntersectIntRect(const nsIntRect& aRoundedRect,
|
||
|
const RectCornerRadii& aCornerRadii,
|
||
|
const nsIntRect& aContainedRect);
|
||
|
|
||
|
/**
|
||
|
* Return whether any part of aTestRect is inside of the rounded
|
||
|
* rectangle formed by aBounds and aRadii (which are indexed by the
|
||
|
* NS_CORNER_* constants in nsStyleConsts.h). This is precise.
|
||
|
*/
|
||
|
static bool RoundedRectIntersectsRect(const nsRect& aRoundedRect,
|
||
|
const nscoord aRadii[8],
|
||
|
const nsRect& aTestRect);
|
||
|
|
||
|
enum {
|
||
|
PAINT_IN_TRANSFORM = 0x01,
|
||
|
PAINT_SYNC_DECODE_IMAGES = 0x02,
|
||
|
PAINT_WIDGET_LAYERS = 0x04,
|
||
|
PAINT_IGNORE_SUPPRESSION = 0x08,
|
||
|
PAINT_DOCUMENT_RELATIVE = 0x10,
|
||
|
PAINT_HIDE_CARET = 0x20,
|
||
|
PAINT_TO_WINDOW = 0x40,
|
||
|
PAINT_EXISTING_TRANSACTION = 0x80,
|
||
|
PAINT_NO_COMPOSITE = 0x100,
|
||
|
PAINT_COMPRESSED = 0x200
|
||
|
};
|
||
|
|
||
|
/**
|
||
|
* Given aFrame, the root frame of a stacking context, paint it and its
|
||
|
* descendants to aRenderingContext.
|
||
|
* @param aRenderingContext a rendering context translated so that (0,0)
|
||
|
* is the origin of aFrame; for best results, (0,0) should transform
|
||
|
* to pixel-aligned coordinates. This can be null, in which case
|
||
|
* aFrame must be a "display root" (root frame for a root document,
|
||
|
* or the root of a popup) with an associated widget and we draw using
|
||
|
* the layer manager for the frame's widget.
|
||
|
* @param aDirtyRegion the region that must be painted, in the coordinates
|
||
|
* of aFrame.
|
||
|
* @param aBackstop paint the dirty area with this color before drawing
|
||
|
* the actual content; pass NS_RGBA(0,0,0,0) to draw no background.
|
||
|
* @param aFlags if PAINT_IN_TRANSFORM is set, then we assume
|
||
|
* this is inside a transform or SVG foreignObject. If
|
||
|
* PAINT_SYNC_DECODE_IMAGES is set, we force synchronous decode on all
|
||
|
* images. If PAINT_WIDGET_LAYERS is set, aFrame must be a display root,
|
||
|
* and we will use the frame's widget's layer manager to paint
|
||
|
* even if aRenderingContext is non-null. This is useful if you want
|
||
|
* to force rendering to use the widget's layer manager for testing
|
||
|
* or speed. PAINT_WIDGET_LAYERS must be set if aRenderingContext is null.
|
||
|
* If PAINT_DOCUMENT_RELATIVE is used, the visible region is interpreted
|
||
|
* as being relative to the document (normally it's relative to the CSS
|
||
|
* viewport) and the document is painted as if no scrolling has occured.
|
||
|
* Only considered if nsIPresShell::IgnoringViewportScrolling is true.
|
||
|
* PAINT_TO_WINDOW sets painting to window to true on the display list
|
||
|
* builder even if we can't tell that we are painting to the window.
|
||
|
* If PAINT_EXISTING_TRANSACTION is set, then BeginTransaction() has already
|
||
|
* been called on aFrame's widget's layer manager and should not be
|
||
|
* called again.
|
||
|
* If PAINT_COMPRESSED is set, the FrameLayerBuilder should be set to
|
||
|
* compressed mode to avoid short cut optimizations.
|
||
|
*
|
||
|
* So there are three possible behaviours:
|
||
|
* 1) PAINT_WIDGET_LAYERS is set and aRenderingContext is null; we paint
|
||
|
* by calling BeginTransaction on the widget's layer manager.
|
||
|
* 2) PAINT_WIDGET_LAYERS is set and aRenderingContext is non-null; we
|
||
|
* paint by calling BeginTransactionWithTarget on the widget's layer
|
||
|
* manager.
|
||
|
* 3) PAINT_WIDGET_LAYERS is not set and aRenderingContext is non-null;
|
||
|
* we paint by construct a BasicLayerManager and calling
|
||
|
* BeginTransactionWithTarget on it. This is desirable if we're doing
|
||
|
* something like drawWindow in a mode where what gets rendered doesn't
|
||
|
* necessarily correspond to what's visible in the window; we don't
|
||
|
* want to mess up the widget's layer tree.
|
||
|
*/
|
||
|
static nsresult PaintFrame(nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
|
||
|
const nsRegion& aDirtyRegion, nscolor aBackstop,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* Uses a binary search for find where the cursor falls in the line of text
|
||
|
* It also keeps track of the part of the string that has already been
|
||
|
* measured so it doesn't have to keep measuring the same text over and over.
|
||
|
*
|
||
|
* @param "aBaseWidth" contains the width in twips of the portion
|
||
|
* of the text that has already been measured, and aBaseInx contains
|
||
|
* the index of the text that has already been measured.
|
||
|
*
|
||
|
* @param aTextWidth returns (in twips) the length of the text that falls
|
||
|
* before the cursor aIndex contains the index of the text where the cursor
|
||
|
* falls.
|
||
|
*/
|
||
|
static bool
|
||
|
BinarySearchForPosition(nsRenderingContext* acx,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
const char16_t* aText,
|
||
|
int32_t aBaseWidth,
|
||
|
int32_t aBaseInx,
|
||
|
int32_t aStartInx,
|
||
|
int32_t aEndInx,
|
||
|
int32_t aCursorPos,
|
||
|
int32_t& aIndex,
|
||
|
int32_t& aTextWidth);
|
||
|
|
||
|
class BoxCallback {
|
||
|
public:
|
||
|
virtual void AddBox(nsIFrame* aFrame) = 0;
|
||
|
};
|
||
|
/**
|
||
|
* Collect all CSS boxes associated with aFrame and its
|
||
|
* continuations, "drilling down" through outer table frames and
|
||
|
* some anonymous blocks since they're not real CSS boxes.
|
||
|
* If aFrame is null, no boxes are returned.
|
||
|
* SVG frames return a single box, themselves.
|
||
|
*/
|
||
|
static void GetAllInFlowBoxes(nsIFrame* aFrame, BoxCallback* aCallback);
|
||
|
|
||
|
/**
|
||
|
* Find the first frame descendant of aFrame (including aFrame) which is
|
||
|
* not an anonymous frame that getBoxQuads/getClientRects should ignore.
|
||
|
*/
|
||
|
static nsIFrame* GetFirstNonAnonymousFrame(nsIFrame* aFrame);
|
||
|
|
||
|
class RectCallback {
|
||
|
public:
|
||
|
virtual void AddRect(const nsRect& aRect) = 0;
|
||
|
};
|
||
|
|
||
|
struct RectAccumulator : public RectCallback {
|
||
|
nsRect mResultRect;
|
||
|
nsRect mFirstRect;
|
||
|
bool mSeenFirstRect;
|
||
|
|
||
|
RectAccumulator();
|
||
|
|
||
|
virtual void AddRect(const nsRect& aRect) override;
|
||
|
};
|
||
|
|
||
|
struct RectListBuilder : public RectCallback {
|
||
|
DOMRectList* mRectList;
|
||
|
|
||
|
explicit RectListBuilder(DOMRectList* aList);
|
||
|
virtual void AddRect(const nsRect& aRect) override;
|
||
|
};
|
||
|
|
||
|
static nsIFrame* GetContainingBlockForClientRect(nsIFrame* aFrame);
|
||
|
|
||
|
enum {
|
||
|
RECTS_ACCOUNT_FOR_TRANSFORMS = 0x01,
|
||
|
// Two bits for specifying which box type to use.
|
||
|
// With neither bit set (default), use the border box.
|
||
|
RECTS_USE_CONTENT_BOX = 0x02,
|
||
|
RECTS_USE_PADDING_BOX = 0x04,
|
||
|
RECTS_USE_MARGIN_BOX = 0x06, // both bits set
|
||
|
RECTS_WHICH_BOX_MASK = 0x06 // bitmask for these two bits
|
||
|
};
|
||
|
/**
|
||
|
* Collect all CSS boxes (content, padding, border, or margin) associated
|
||
|
* with aFrame and its continuations, "drilling down" through outer table
|
||
|
* frames and some anonymous blocks since they're not real CSS boxes.
|
||
|
* The boxes are positioned relative to aRelativeTo (taking scrolling
|
||
|
* into account) and passed to the callback in frame-tree order.
|
||
|
* If aFrame is null, no boxes are returned.
|
||
|
* For SVG frames, returns one rectangle, the bounding box.
|
||
|
* If aFlags includes RECTS_ACCOUNT_FOR_TRANSFORMS, then when converting
|
||
|
* the boxes into aRelativeTo coordinates, transforms (including CSS
|
||
|
* and SVG transforms) are taken into account.
|
||
|
* If aFlags includes one of RECTS_USE_CONTENT_BOX, RECTS_USE_PADDING_BOX,
|
||
|
* or RECTS_USE_MARGIN_BOX, the corresponding type of box is used.
|
||
|
* Otherwise (by default), the border box is used.
|
||
|
*/
|
||
|
static void GetAllInFlowRects(nsIFrame* aFrame, nsIFrame* aRelativeTo,
|
||
|
RectCallback* aCallback, uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* Computes the union of all rects returned by GetAllInFlowRects. If
|
||
|
* the union is empty, returns the first rect.
|
||
|
* If aFlags includes RECTS_ACCOUNT_FOR_TRANSFORMS, then when converting
|
||
|
* the boxes into aRelativeTo coordinates, transforms (including CSS
|
||
|
* and SVG transforms) are taken into account.
|
||
|
* If aFlags includes one of RECTS_USE_CONTENT_BOX, RECTS_USE_PADDING_BOX,
|
||
|
* or RECTS_USE_MARGIN_BOX, the corresponding type of box is used.
|
||
|
* Otherwise (by default), the border box is used.
|
||
|
*/
|
||
|
static nsRect GetAllInFlowRectsUnion(nsIFrame* aFrame, nsIFrame* aRelativeTo,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
enum {
|
||
|
EXCLUDE_BLUR_SHADOWS = 0x01
|
||
|
};
|
||
|
/**
|
||
|
* Takes a text-shadow array from the style properties of a given nsIFrame and
|
||
|
* computes the union of those shadows along with the given initial rect.
|
||
|
* If there are no shadows, the initial rect is returned.
|
||
|
*/
|
||
|
static nsRect GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
|
||
|
nsIFrame* aFrame,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* Computes the destination rect that a given replaced element should render
|
||
|
* into, based on its CSS 'object-fit' and 'object-position' properties.
|
||
|
*
|
||
|
* @param aConstraintRect The constraint rect that we have at our disposal,
|
||
|
* which would e.g. be exactly filled by the image
|
||
|
* if we had "object-fit: fill".
|
||
|
* @param aIntrinsicSize The replaced content's intrinsic size, as reported
|
||
|
* by nsIFrame::GetIntrinsicSize().
|
||
|
* @param aIntrinsicRatio The replaced content's intrinsic ratio, as reported
|
||
|
* by nsIFrame::GetIntrinsicRatio().
|
||
|
* @param aStylePos The nsStylePosition struct that contains the 'object-fit'
|
||
|
* and 'object-position' values that we should rely on.
|
||
|
* (This should usually be the nsStylePosition for the
|
||
|
* replaced element in question, but not always. For
|
||
|
* example, a <video>'s poster-image has a dedicated
|
||
|
* anonymous element & child-frame, but we should still use
|
||
|
* the <video>'s 'object-fit' and 'object-position' values.)
|
||
|
* @param aAnchorPoint [out] A point that should be pixel-aligned by functions
|
||
|
* like nsLayoutUtils::DrawImage. See documentation
|
||
|
* in nsCSSRendering.h for ComputeObjectAnchorPoint.
|
||
|
* @return The nsRect into which we should render the replaced content (using
|
||
|
* the same coordinate space as the passed-in aConstraintRect).
|
||
|
*/
|
||
|
static nsRect ComputeObjectDestRect(const nsRect& aConstraintRect,
|
||
|
const IntrinsicSize& aIntrinsicSize,
|
||
|
const nsSize& aIntrinsicRatio,
|
||
|
const nsStylePosition* aStylePos,
|
||
|
nsPoint* aAnchorPoint = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Get the font metrics corresponding to the frame's style data.
|
||
|
* @param aFrame the frame
|
||
|
* @param aFontMetrics the font metrics result
|
||
|
* @param aSizeInflation number to multiply font size by
|
||
|
* @return success or failure code
|
||
|
*/
|
||
|
static nsresult GetFontMetricsForFrame(const nsIFrame* aFrame,
|
||
|
nsFontMetrics** aFontMetrics,
|
||
|
float aSizeInflation = 1.0f);
|
||
|
|
||
|
/**
|
||
|
* Get the font metrics corresponding to the given style data.
|
||
|
* @param aStyleContext the style data
|
||
|
* @param aFontMetrics the font metrics result
|
||
|
* @param aSizeInflation number to multiply font size by
|
||
|
* @return success or failure code
|
||
|
*/
|
||
|
static nsresult GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
|
||
|
nsFontMetrics** aFontMetrics,
|
||
|
float aSizeInflation = 1.0f);
|
||
|
|
||
|
/**
|
||
|
* Get the font metrics of emphasis marks corresponding to the given
|
||
|
* style data. The result is same as GetFontMetricsForStyleContext
|
||
|
* except that the font size is scaled down to 50%.
|
||
|
* @param aStyleContext the style data
|
||
|
* @param aFontMetrics the font metrics result
|
||
|
* @param aInflation number to multiple font size by
|
||
|
* @return success or failure code
|
||
|
*/
|
||
|
static nsresult GetFontMetricsOfEmphasisMarks(nsStyleContext* aStyleContext,
|
||
|
nsFontMetrics** aFontMetrics,
|
||
|
float aInflation)
|
||
|
{
|
||
|
return GetFontMetricsForStyleContext(aStyleContext, aFontMetrics,
|
||
|
aInflation * 0.5f);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Find the immediate child of aParent whose frame subtree contains
|
||
|
* aDescendantFrame. Returns null if aDescendantFrame is not a descendant
|
||
|
* of aParent.
|
||
|
*/
|
||
|
static nsIFrame* FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame);
|
||
|
|
||
|
/**
|
||
|
* Find the nearest ancestor that's a block
|
||
|
*/
|
||
|
static nsBlockFrame* FindNearestBlockAncestor(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Find the nearest ancestor that's not for generated content. Will return
|
||
|
* aFrame if aFrame is not for generated content.
|
||
|
*/
|
||
|
static nsIFrame* GetNonGeneratedAncestor(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Cast aFrame to an nsBlockFrame* or return null if it's not
|
||
|
* an nsBlockFrame.
|
||
|
*/
|
||
|
static nsBlockFrame* GetAsBlock(nsIFrame* aFrame);
|
||
|
|
||
|
/*
|
||
|
* Whether the frame is an nsBlockFrame which is not a wrapper block.
|
||
|
*/
|
||
|
static bool IsNonWrapperBlock(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* If aFrame is an out of flow frame, return its placeholder, otherwise
|
||
|
* return its parent.
|
||
|
*/
|
||
|
static nsIFrame* GetParentOrPlaceholderFor(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* If aFrame is an out of flow frame, return its placeholder, otherwise
|
||
|
* return its (possibly cross-doc) parent.
|
||
|
*/
|
||
|
static nsIFrame* GetParentOrPlaceholderForCrossDoc(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get a frame's next-in-flow, or, if it doesn't have one, its
|
||
|
* block-in-inline-split sibling.
|
||
|
*/
|
||
|
static nsIFrame*
|
||
|
GetNextContinuationOrIBSplitSibling(nsIFrame *aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the first frame in the continuation-plus-ib-split-sibling chain
|
||
|
* containing aFrame.
|
||
|
*/
|
||
|
static nsIFrame*
|
||
|
FirstContinuationOrIBSplitSibling(nsIFrame *aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the last frame in the continuation-plus-ib-split-sibling chain
|
||
|
* containing aFrame.
|
||
|
*/
|
||
|
static nsIFrame*
|
||
|
LastContinuationOrIBSplitSibling(nsIFrame *aFrame);
|
||
|
|
||
|
/**
|
||
|
* Is FirstContinuationOrIBSplitSibling(aFrame) going to return
|
||
|
* aFrame?
|
||
|
*/
|
||
|
static bool
|
||
|
IsFirstContinuationOrIBSplitSibling(nsIFrame *aFrame);
|
||
|
|
||
|
/**
|
||
|
* Check whether aFrame is a part of the scrollbar or scrollcorner of
|
||
|
* the root content.
|
||
|
* @param aFrame the checking frame.
|
||
|
* @return true if the frame is a part of the scrollbar or scrollcorner of
|
||
|
* the root content.
|
||
|
*/
|
||
|
static bool IsViewportScrollbarFrame(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the contribution of aFrame to its containing block's intrinsic
|
||
|
* size for the given physical axis. This considers the child's intrinsic
|
||
|
* width, its 'width', 'min-width', and 'max-width' properties (or 'height'
|
||
|
* variations if that's what matches aAxis) and its padding, border and margin
|
||
|
* in the corresponding dimension.
|
||
|
*/
|
||
|
enum class IntrinsicISizeType { MIN_ISIZE, PREF_ISIZE };
|
||
|
static const auto MIN_ISIZE = IntrinsicISizeType::MIN_ISIZE;
|
||
|
static const auto PREF_ISIZE = IntrinsicISizeType::PREF_ISIZE;
|
||
|
enum {
|
||
|
IGNORE_PADDING = 0x01,
|
||
|
BAIL_IF_REFLOW_NEEDED = 0x02, // returns NS_INTRINSIC_WIDTH_UNKNOWN if so
|
||
|
MIN_INTRINSIC_ISIZE = 0x04, // use min-width/height instead of width/height
|
||
|
};
|
||
|
static nscoord IntrinsicForAxis(mozilla::PhysicalAxis aAxis,
|
||
|
nsRenderingContext* aRenderingContext,
|
||
|
nsIFrame* aFrame,
|
||
|
IntrinsicISizeType aType,
|
||
|
uint32_t aFlags = 0);
|
||
|
/**
|
||
|
* Calls IntrinsicForAxis with aFrame's parent's inline physical axis.
|
||
|
*/
|
||
|
static nscoord IntrinsicForContainer(nsRenderingContext* aRenderingContext,
|
||
|
nsIFrame* aFrame,
|
||
|
IntrinsicISizeType aType,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* Get the definite size contribution of aFrame for the given physical axis.
|
||
|
* This considers the child's 'min-width' property (or 'min-height' if the
|
||
|
* given axis is vertical), and its padding, border, and margin in the
|
||
|
* corresponding dimension. If the 'min-' property is 'auto' (and 'overflow'
|
||
|
* is 'visible') and the corresponding 'width'/'height' is definite it returns
|
||
|
* the "specified / transferred size" for:
|
||
|
* https://drafts.csswg.org/css-grid/#min-size-auto
|
||
|
* Note that any percentage in 'width'/'height' makes it count as indefinite.
|
||
|
* If the 'min-' property is 'auto' and 'overflow' is not 'visible', then it
|
||
|
* calculates the result as if the 'min-' computed value is zero.
|
||
|
* Otherwise, return NS_UNCONSTRAINEDSIZE.
|
||
|
*
|
||
|
* @note this behavior is specific to Grid/Flexbox (currently) so aFrame
|
||
|
* should be a grid/flex item.
|
||
|
*/
|
||
|
static nscoord MinSizeContributionForAxis(mozilla::PhysicalAxis aAxis,
|
||
|
nsRenderingContext* aRC,
|
||
|
nsIFrame* aFrame,
|
||
|
IntrinsicISizeType aType,
|
||
|
uint32_t aFlags = 0);
|
||
|
|
||
|
/**
|
||
|
* This function increases an initial intrinsic size, 'aCurrent', according
|
||
|
* to the given 'aPercent', such that the size-increase makes up exactly
|
||
|
* 'aPercent' percent of the returned value. If 'aPercent' is less than
|
||
|
* or equal to zero the original 'aCurrent' value is returned. If 'aPercent'
|
||
|
* is greater than or equal to 1.0 the value nscoord_MAX is returned.
|
||
|
* (We don't increase the size if MIN_ISIZE is passed in, though.)
|
||
|
*/
|
||
|
static nscoord AddPercents(IntrinsicISizeType aType, nscoord aCurrent,
|
||
|
float aPercent)
|
||
|
{
|
||
|
if (aPercent > 0.0f && aType == nsLayoutUtils::PREF_ISIZE) {
|
||
|
// XXX Should we also consider percentages for min widths, up to a
|
||
|
// limit?
|
||
|
return MOZ_UNLIKELY(aPercent >= 1.0f) ? nscoord_MAX
|
||
|
: NSToCoordRound(float(aCurrent) / (1.0f - aPercent));
|
||
|
}
|
||
|
return aCurrent;
|
||
|
}
|
||
|
|
||
|
/*
|
||
|
* Convert nsStyleCoord to nscoord when percentages depend on the
|
||
|
* containing block size.
|
||
|
* @param aPercentBasis The width or height of the containing block
|
||
|
* (whichever the client wants to use for resolving percentages).
|
||
|
*/
|
||
|
static nscoord ComputeCBDependentValue(nscoord aPercentBasis,
|
||
|
const nsStyleCoord& aCoord);
|
||
|
|
||
|
/*
|
||
|
* Convert nsStyleCoord to nscoord when percentages depend on the
|
||
|
* containing block width, and enumerated values are for width,
|
||
|
* min-width, or max-width. Returns the content-box width value based
|
||
|
* on aContentEdgeToBoxSizing and aBoxSizingToMarginEdge (which are
|
||
|
* also used for the enumerated values for width. This function does
|
||
|
* not handle 'auto'. It ensures that the result is nonnegative.
|
||
|
*
|
||
|
* @param aRenderingContext Rendering context for font measurement/metrics.
|
||
|
* @param aFrame Frame whose (min-/max-/)width is being computed.
|
||
|
* @param aContainingBlockWidth Width of aFrame's containing block.
|
||
|
* @param aContentEdgeToBoxSizing The sum of any left/right padding and
|
||
|
* border that goes inside the rect chosen by box-sizing.
|
||
|
* @param aBoxSizingToMarginEdge The sum of any left/right padding, border,
|
||
|
* and margin that goes outside the rect chosen by box-sizing.
|
||
|
* @param aCoord The width value to compute.
|
||
|
*/
|
||
|
// XXX to be removed
|
||
|
static nscoord ComputeWidthValue(
|
||
|
nsRenderingContext* aRenderingContext,
|
||
|
nsIFrame* aFrame,
|
||
|
nscoord aContainingBlockWidth,
|
||
|
nscoord aContentEdgeToBoxSizing,
|
||
|
nscoord aBoxSizingToMarginEdge,
|
||
|
const nsStyleCoord& aCoord)
|
||
|
{
|
||
|
return ComputeISizeValue(aRenderingContext,
|
||
|
aFrame,
|
||
|
aContainingBlockWidth,
|
||
|
aContentEdgeToBoxSizing,
|
||
|
aBoxSizingToMarginEdge,
|
||
|
aCoord);
|
||
|
}
|
||
|
|
||
|
static nscoord ComputeISizeValue(
|
||
|
nsRenderingContext* aRenderingContext,
|
||
|
nsIFrame* aFrame,
|
||
|
nscoord aContainingBlockISize,
|
||
|
nscoord aContentEdgeToBoxSizing,
|
||
|
nscoord aBoxSizingToMarginEdge,
|
||
|
const nsStyleCoord& aCoord);
|
||
|
|
||
|
/*
|
||
|
* Convert nsStyleCoord to nscoord when percentages depend on the
|
||
|
* containing block height.
|
||
|
*/
|
||
|
// XXX to be removed
|
||
|
static nscoord ComputeHeightDependentValue(
|
||
|
nscoord aContainingBlockHeight,
|
||
|
const nsStyleCoord& aCoord)
|
||
|
{
|
||
|
return ComputeBSizeDependentValue(aContainingBlockHeight, aCoord);
|
||
|
}
|
||
|
|
||
|
static nscoord ComputeBSizeDependentValue(
|
||
|
nscoord aContainingBlockBSize,
|
||
|
const nsStyleCoord& aCoord);
|
||
|
|
||
|
/*
|
||
|
* Likewise, but for 'height', 'min-height', or 'max-height'.
|
||
|
*/
|
||
|
// XXX to be removed
|
||
|
static nscoord ComputeHeightValue(nscoord aContainingBlockHeight,
|
||
|
nscoord aContentEdgeToBoxSizingBoxEdge,
|
||
|
const nsStyleCoord& aCoord)
|
||
|
{
|
||
|
return ComputeBSizeValue(aContainingBlockHeight,
|
||
|
aContentEdgeToBoxSizingBoxEdge,
|
||
|
aCoord);
|
||
|
}
|
||
|
|
||
|
static nscoord ComputeBSizeValue(nscoord aContainingBlockBSize,
|
||
|
nscoord aContentEdgeToBoxSizingBoxEdge,
|
||
|
const nsStyleCoord& aCoord)
|
||
|
{
|
||
|
MOZ_ASSERT(aContainingBlockBSize != nscoord_MAX || !aCoord.HasPercent(),
|
||
|
"caller must deal with %% of unconstrained block-size");
|
||
|
MOZ_ASSERT(aCoord.IsCoordPercentCalcUnit());
|
||
|
|
||
|
nscoord result =
|
||
|
nsRuleNode::ComputeCoordPercentCalc(aCoord, aContainingBlockBSize);
|
||
|
// Clamp calc(), and the subtraction for box-sizing.
|
||
|
return std::max(0, result - aContentEdgeToBoxSizingBoxEdge);
|
||
|
}
|
||
|
|
||
|
// XXX to be removed
|
||
|
static bool IsAutoHeight(const nsStyleCoord &aCoord, nscoord aCBHeight)
|
||
|
{
|
||
|
return IsAutoBSize(aCoord, aCBHeight);
|
||
|
}
|
||
|
|
||
|
static bool IsAutoBSize(const nsStyleCoord &aCoord, nscoord aCBBSize)
|
||
|
{
|
||
|
nsStyleUnit unit = aCoord.GetUnit();
|
||
|
return unit == eStyleUnit_Auto || // only for 'height'
|
||
|
unit == eStyleUnit_None || // only for 'max-height'
|
||
|
// The enumerated values were originally aimed at inline-size
|
||
|
// (or width, as it was before logicalization). For now, let them
|
||
|
// return true here, so that we don't call ComputeBSizeValue with
|
||
|
// value types that it doesn't understand. (See bug 1113216.)
|
||
|
//
|
||
|
// FIXME (bug 567039, bug 527285)
|
||
|
// This isn't correct for the 'fill' value or for the 'min-*' or
|
||
|
// 'max-*' properties, which need to be handled differently by
|
||
|
// the callers of IsAutoBSize().
|
||
|
unit == eStyleUnit_Enumerated ||
|
||
|
(aCBBSize == nscoord_MAX && aCoord.HasPercent());
|
||
|
}
|
||
|
|
||
|
static bool IsPaddingZero(const nsStyleCoord &aCoord)
|
||
|
{
|
||
|
return (aCoord.GetUnit() == eStyleUnit_Coord &&
|
||
|
aCoord.GetCoordValue() == 0) ||
|
||
|
(aCoord.GetUnit() == eStyleUnit_Percent &&
|
||
|
aCoord.GetPercentValue() == 0.0f) ||
|
||
|
(aCoord.IsCalcUnit() &&
|
||
|
// clamp negative calc() to 0
|
||
|
nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) <= 0 &&
|
||
|
nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) <= 0);
|
||
|
}
|
||
|
|
||
|
static bool IsMarginZero(const nsStyleCoord &aCoord)
|
||
|
{
|
||
|
return (aCoord.GetUnit() == eStyleUnit_Coord &&
|
||
|
aCoord.GetCoordValue() == 0) ||
|
||
|
(aCoord.GetUnit() == eStyleUnit_Percent &&
|
||
|
aCoord.GetPercentValue() == 0.0f) ||
|
||
|
(aCoord.IsCalcUnit() &&
|
||
|
nsRuleNode::ComputeCoordPercentCalc(aCoord, nscoord_MAX) == 0 &&
|
||
|
nsRuleNode::ComputeCoordPercentCalc(aCoord, 0) == 0);
|
||
|
}
|
||
|
|
||
|
static void MarkDescendantsDirty(nsIFrame *aSubtreeRoot);
|
||
|
|
||
|
/*
|
||
|
* Calculate the used values for 'width' and 'height' for a replaced element.
|
||
|
*
|
||
|
* http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
|
||
|
*/
|
||
|
static mozilla::LogicalSize
|
||
|
ComputeSizeWithIntrinsicDimensions(mozilla::WritingMode aWM,
|
||
|
nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
|
||
|
const mozilla::IntrinsicSize& aIntrinsicSize,
|
||
|
nsSize aIntrinsicRatio,
|
||
|
const mozilla::LogicalSize& aCBSize,
|
||
|
const mozilla::LogicalSize& aMargin,
|
||
|
const mozilla::LogicalSize& aBorder,
|
||
|
const mozilla::LogicalSize& aPadding);
|
||
|
|
||
|
/*
|
||
|
* Calculate the used values for 'width' and 'height' when width
|
||
|
* and height are 'auto'. The tentWidth and tentHeight arguments should be
|
||
|
* the result of applying the rules for computing intrinsic sizes and ratios.
|
||
|
* as specified by CSS 2.1 sections 10.3.2 and 10.6.2
|
||
|
*/
|
||
|
static nsSize ComputeAutoSizeWithIntrinsicDimensions(nscoord minWidth, nscoord minHeight,
|
||
|
nscoord maxWidth, nscoord maxHeight,
|
||
|
nscoord tentWidth, nscoord tentHeight);
|
||
|
|
||
|
// Implement nsIFrame::GetPrefISize in terms of nsIFrame::AddInlinePrefISize
|
||
|
static nscoord PrefISizeFromInline(nsIFrame* aFrame,
|
||
|
nsRenderingContext* aRenderingContext);
|
||
|
|
||
|
// Implement nsIFrame::GetMinISize in terms of nsIFrame::AddInlineMinISize
|
||
|
static nscoord MinISizeFromInline(nsIFrame* aFrame,
|
||
|
nsRenderingContext* aRenderingContext);
|
||
|
|
||
|
// Get a suitable foreground color for painting aProperty for aFrame.
|
||
|
static nscolor GetColor(nsIFrame* aFrame, nsCSSProperty aProperty);
|
||
|
|
||
|
// Get a baseline y position in app units that is snapped to device pixels.
|
||
|
static gfxFloat GetSnappedBaselineY(nsIFrame* aFrame, gfxContext* aContext,
|
||
|
nscoord aY, nscoord aAscent);
|
||
|
// Ditto for an x position (for vertical text). Note that for vertical-rl
|
||
|
// writing mode, the ascent value should be negated by the caller.
|
||
|
static gfxFloat GetSnappedBaselineX(nsIFrame* aFrame, gfxContext* aContext,
|
||
|
nscoord aX, nscoord aAscent);
|
||
|
|
||
|
static nscoord AppUnitWidthOfString(char16_t aC,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext) {
|
||
|
return AppUnitWidthOfString(&aC, 1, aFontMetrics, aContext);
|
||
|
}
|
||
|
static nscoord AppUnitWidthOfString(const nsString& aString,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext) {
|
||
|
return nsLayoutUtils::AppUnitWidthOfString(aString.get(), aString.Length(),
|
||
|
aFontMetrics, aContext);
|
||
|
}
|
||
|
static nscoord AppUnitWidthOfString(const char16_t *aString,
|
||
|
uint32_t aLength,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext);
|
||
|
static nscoord AppUnitWidthOfStringBidi(const nsString& aString,
|
||
|
const nsIFrame* aFrame,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext) {
|
||
|
return nsLayoutUtils::AppUnitWidthOfStringBidi(aString.get(),
|
||
|
aString.Length(), aFrame,
|
||
|
aFontMetrics, aContext);
|
||
|
}
|
||
|
static nscoord AppUnitWidthOfStringBidi(const char16_t* aString,
|
||
|
uint32_t aLength,
|
||
|
const nsIFrame* aFrame,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext);
|
||
|
|
||
|
static bool StringWidthIsGreaterThan(const nsString& aString,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext,
|
||
|
nscoord aWidth);
|
||
|
|
||
|
static nsBoundingMetrics AppUnitBoundsOfString(const char16_t* aString,
|
||
|
uint32_t aLength,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext);
|
||
|
|
||
|
static void DrawString(const nsIFrame* aFrame,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext* aContext,
|
||
|
const char16_t* aString,
|
||
|
int32_t aLength,
|
||
|
nsPoint aPoint,
|
||
|
nsStyleContext* aStyleContext = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Supports only LTR or RTL. Bidi (mixed direction) is not supported.
|
||
|
*/
|
||
|
static void DrawUniDirString(const char16_t* aString,
|
||
|
uint32_t aLength,
|
||
|
nsPoint aPoint,
|
||
|
nsFontMetrics& aFontMetrics,
|
||
|
nsRenderingContext& aContext);
|
||
|
|
||
|
/**
|
||
|
* Helper function for drawing text-shadow. The callback's job
|
||
|
* is to draw whatever needs to be blurred onto the given context.
|
||
|
*/
|
||
|
typedef void (* TextShadowCallback)(nsRenderingContext* aCtx,
|
||
|
nsPoint aShadowOffset,
|
||
|
const nscolor& aShadowColor,
|
||
|
void* aData);
|
||
|
|
||
|
static void PaintTextShadow(const nsIFrame* aFrame,
|
||
|
nsRenderingContext* aContext,
|
||
|
const nsRect& aTextRect,
|
||
|
const nsRect& aDirtyRect,
|
||
|
const nscolor& aForegroundColor,
|
||
|
TextShadowCallback aCallback,
|
||
|
void* aCallbackData);
|
||
|
|
||
|
/**
|
||
|
* Gets the baseline to vertically center text from a font within a
|
||
|
* line of specified height.
|
||
|
* aIsInverted: true if the text is inverted relative to the block
|
||
|
* direction, so that the block-dir "ascent" corresponds to font
|
||
|
* descent. (Applies to sideways text in vertical-lr mode.)
|
||
|
*
|
||
|
* Returns the baseline position relative to the top of the line.
|
||
|
*/
|
||
|
static nscoord GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
|
||
|
nscoord aLineHeight,
|
||
|
bool aIsInverted);
|
||
|
|
||
|
/**
|
||
|
* Derive a baseline of |aFrame| (measured from its top border edge)
|
||
|
* from its first in-flow line box (not descending into anything with
|
||
|
* 'overflow' not 'visible', potentially including aFrame itself).
|
||
|
*
|
||
|
* Returns true if a baseline was found (and fills in aResult).
|
||
|
* Otherwise returns false.
|
||
|
*/
|
||
|
static bool GetFirstLineBaseline(mozilla::WritingMode aWritingMode,
|
||
|
const nsIFrame* aFrame, nscoord* aResult);
|
||
|
|
||
|
/**
|
||
|
* Just like GetFirstLineBaseline, except also returns the top and
|
||
|
* bottom of the line with the baseline.
|
||
|
*
|
||
|
* Returns true if a line was found (and fills in aResult).
|
||
|
* Otherwise returns false.
|
||
|
*/
|
||
|
struct LinePosition {
|
||
|
nscoord mBStart, mBaseline, mBEnd;
|
||
|
|
||
|
LinePosition operator+(nscoord aOffset) const {
|
||
|
LinePosition result;
|
||
|
result.mBStart = mBStart + aOffset;
|
||
|
result.mBaseline = mBaseline + aOffset;
|
||
|
result.mBEnd = mBEnd + aOffset;
|
||
|
return result;
|
||
|
}
|
||
|
};
|
||
|
static bool GetFirstLinePosition(mozilla::WritingMode aWritingMode,
|
||
|
const nsIFrame* aFrame,
|
||
|
LinePosition* aResult);
|
||
|
|
||
|
|
||
|
/**
|
||
|
* Derive a baseline of |aFrame| (measured from its top border edge)
|
||
|
* from its last in-flow line box (not descending into anything with
|
||
|
* 'overflow' not 'visible', potentially including aFrame itself).
|
||
|
*
|
||
|
* Returns true if a baseline was found (and fills in aResult).
|
||
|
* Otherwise returns false.
|
||
|
*/
|
||
|
static bool GetLastLineBaseline(mozilla::WritingMode aWritingMode,
|
||
|
const nsIFrame* aFrame, nscoord* aResult);
|
||
|
|
||
|
/**
|
||
|
* Returns a block-dir coordinate relative to this frame's origin that
|
||
|
* represents the logical block-end of the frame or its visible content,
|
||
|
* whichever is further from the origin.
|
||
|
* Relative positioning is ignored and margins and glyph bounds are not
|
||
|
* considered.
|
||
|
* This value will be >= mRect.BSize() and <= overflowRect.BEnd() unless
|
||
|
* relative positioning is applied.
|
||
|
*/
|
||
|
static nscoord CalculateContentBEnd(mozilla::WritingMode aWritingMode,
|
||
|
nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Gets the closest frame (the frame passed in or one of its parents) that
|
||
|
* qualifies as a "layer"; used in DOM0 methods that depends upon that
|
||
|
* definition. This is the nearest frame that is either positioned or scrolled
|
||
|
* (the child of a scroll frame).
|
||
|
*/
|
||
|
static nsIFrame* GetClosestLayer(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Gets the graphics filter for the frame
|
||
|
*/
|
||
|
static Filter GetGraphicsFilterForFrame(nsIFrame* aFrame);
|
||
|
|
||
|
/* N.B. The only difference between variants of the Draw*Image
|
||
|
* functions below is the type of the aImage argument.
|
||
|
*/
|
||
|
|
||
|
/**
|
||
|
* Draw a background image. The image's dimensions are as specified in aDest;
|
||
|
* the image itself is not consulted to determine a size.
|
||
|
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
|
||
|
* @param aRenderingContext Where to draw the image, set up with an
|
||
|
* appropriate scale and transform for drawing in
|
||
|
* app units.
|
||
|
* @param aImage The image.
|
||
|
* @param aImageSize The unscaled size of the image being drawn.
|
||
|
* (This might be the image's size if no scaling
|
||
|
* occurs, or it might be the image's size if
|
||
|
* the image is a vector image being rendered at
|
||
|
* that size.)
|
||
|
* @param aDest The position and scaled area where one copy of
|
||
|
* the image should be drawn.
|
||
|
* @param aFill The area to be filled with copies of the image.
|
||
|
* @param aAnchor A point in aFill which we will ensure is
|
||
|
* pixel-aligned in the output.
|
||
|
* @param aDirty Pixels outside this area may be skipped.
|
||
|
* @param aImageFlags Image flags of the imgIContainer::FLAG_* variety.
|
||
|
* @param aExtendMode How to extend the image over the dest rect.
|
||
|
*/
|
||
|
static DrawResult DrawBackgroundImage(gfxContext& aContext,
|
||
|
nsPresContext* aPresContext,
|
||
|
imgIContainer* aImage,
|
||
|
const CSSIntSize& aImageSize,
|
||
|
Filter aGraphicsFilter,
|
||
|
const nsRect& aDest,
|
||
|
const nsRect& aFill,
|
||
|
const nsPoint& aAnchor,
|
||
|
const nsRect& aDirty,
|
||
|
uint32_t aImageFlags,
|
||
|
ExtendMode aExtendMode);
|
||
|
|
||
|
/**
|
||
|
* Draw an image.
|
||
|
* See https://wiki.mozilla.org/Gecko:Image_Snapping_and_Rendering
|
||
|
* @param aRenderingContext Where to draw the image, set up with an
|
||
|
* appropriate scale and transform for drawing in
|
||
|
* app units.
|
||
|
* @param aImage The image.
|
||
|
* @param aDest Where one copy of the image should mapped to.
|
||
|
* @param aFill The area to be filled with copies of the
|
||
|
* image.
|
||
|
* @param aAnchor A point in aFill which we will ensure is
|
||
|
* pixel-aligned in the output.
|
||
|
* @param aDirty Pixels outside this area may be skipped.
|
||
|
* @param aImageFlags Image flags of the imgIContainer::FLAG_* variety
|
||
|
*/
|
||
|
static DrawResult DrawImage(gfxContext& aContext,
|
||
|
nsPresContext* aPresContext,
|
||
|
imgIContainer* aImage,
|
||
|
Filter aGraphicsFilter,
|
||
|
const nsRect& aDest,
|
||
|
const nsRect& aFill,
|
||
|
const nsPoint& aAnchor,
|
||
|
const nsRect& aDirty,
|
||
|
uint32_t aImageFlags);
|
||
|
|
||
|
static inline void InitDashPattern(StrokeOptions& aStrokeOptions,
|
||
|
uint8_t aBorderStyle) {
|
||
|
if (aBorderStyle == NS_STYLE_BORDER_STYLE_DOTTED) {
|
||
|
static Float dot[] = { 1.f, 1.f };
|
||
|
aStrokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dot);
|
||
|
aStrokeOptions.mDashPattern = dot;
|
||
|
} else if (aBorderStyle == NS_STYLE_BORDER_STYLE_DASHED) {
|
||
|
static Float dash[] = { 5.f, 5.f };
|
||
|
aStrokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dash);
|
||
|
aStrokeOptions.mDashPattern = dash;
|
||
|
} else {
|
||
|
aStrokeOptions.mDashLength = 0;
|
||
|
aStrokeOptions.mDashPattern = nullptr;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Convert an nsRect to a gfxRect.
|
||
|
*/
|
||
|
static gfxRect RectToGfxRect(const nsRect& aRect,
|
||
|
int32_t aAppUnitsPerDevPixel);
|
||
|
|
||
|
static gfxPoint PointToGfxPoint(const nsPoint& aPoint,
|
||
|
int32_t aAppUnitsPerPixel) {
|
||
|
return gfxPoint(gfxFloat(aPoint.x) / aAppUnitsPerPixel,
|
||
|
gfxFloat(aPoint.y) / aAppUnitsPerPixel);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Draw a whole image without scaling or tiling.
|
||
|
*
|
||
|
* @param aRenderingContext Where to draw the image, set up with an
|
||
|
* appropriate scale and transform for drawing in
|
||
|
* app units.
|
||
|
* @param aImage The image.
|
||
|
* @param aDest The top-left where the image should be drawn.
|
||
|
* @param aDirty If non-null, then pixels outside this area may
|
||
|
* be skipped.
|
||
|
* @param aImageFlags Image flags of the imgIContainer::FLAG_* variety
|
||
|
* @param aSourceArea If non-null, this area is extracted from
|
||
|
* the image and drawn at aDest. It's
|
||
|
* in appunits. For best results it should
|
||
|
* be aligned with image pixels.
|
||
|
*/
|
||
|
static DrawResult DrawSingleUnscaledImage(gfxContext& aContext,
|
||
|
nsPresContext* aPresContext,
|
||
|
imgIContainer* aImage,
|
||
|
Filter aGraphicsFilter,
|
||
|
const nsPoint& aDest,
|
||
|
const nsRect* aDirty,
|
||
|
uint32_t aImageFlags,
|
||
|
const nsRect* aSourceArea = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Draw a whole image without tiling.
|
||
|
*
|
||
|
* @param aRenderingContext Where to draw the image, set up with an
|
||
|
* appropriate scale and transform for drawing in
|
||
|
* app units.
|
||
|
* @param aImage The image.
|
||
|
* @param aDest The area that the image should fill.
|
||
|
* @param aDirty Pixels outside this area may be skipped.
|
||
|
* @param aSVGContext If non-null, SVG-related rendering context
|
||
|
* such as overridden attributes on the image
|
||
|
* document's root <svg> node. Ignored for
|
||
|
* raster images.
|
||
|
* @param aImageFlags Image flags of the imgIContainer::FLAG_*
|
||
|
* variety.
|
||
|
* @param aAnchor If non-null, a point which we will ensure
|
||
|
* is pixel-aligned in the output.
|
||
|
* @param aSourceArea If non-null, this area is extracted from
|
||
|
* the image and drawn in aDest. It's
|
||
|
* in appunits. For best results it should
|
||
|
* be aligned with image pixels.
|
||
|
*/
|
||
|
static DrawResult DrawSingleImage(gfxContext& aContext,
|
||
|
nsPresContext* aPresContext,
|
||
|
imgIContainer* aImage,
|
||
|
Filter aGraphicsFilter,
|
||
|
const nsRect& aDest,
|
||
|
const nsRect& aDirty,
|
||
|
const mozilla::SVGImageContext* aSVGContext,
|
||
|
uint32_t aImageFlags,
|
||
|
const nsPoint* aAnchorPoint = nullptr,
|
||
|
const nsRect* aSourceArea = nullptr);
|
||
|
|
||
|
/**
|
||
|
* Given an imgIContainer, this method attempts to obtain an intrinsic
|
||
|
* px-valued height & width for it. If the imgIContainer has a non-pixel
|
||
|
* value for either height or width, this method tries to generate a pixel
|
||
|
* value for that dimension using the intrinsic ratio (if available). The
|
||
|
* intrinsic ratio will be assigned to aIntrinsicRatio; if there's no
|
||
|
* intrinsic ratio then (0, 0) will be assigned.
|
||
|
*
|
||
|
* This method will always set aGotWidth and aGotHeight to indicate whether
|
||
|
* we were able to successfully obtain (or compute) a value for each
|
||
|
* dimension.
|
||
|
*
|
||
|
* NOTE: This method is similar to ComputeSizeWithIntrinsicDimensions. The
|
||
|
* difference is that this one is simpler and is suited to places where we
|
||
|
* have less information about the frame tree.
|
||
|
*/
|
||
|
static void ComputeSizeForDrawing(imgIContainer* aImage,
|
||
|
CSSIntSize& aImageSize,
|
||
|
nsSize& aIntrinsicRatio,
|
||
|
bool& aGotWidth,
|
||
|
bool& aGotHeight);
|
||
|
|
||
|
/**
|
||
|
* Given an imgIContainer, this method attempts to obtain an intrinsic
|
||
|
* px-valued height & width for it. If the imgIContainer has a non-pixel
|
||
|
* value for either height or width, this method tries to generate a pixel
|
||
|
* value for that dimension using the intrinsic ratio (if available). If,
|
||
|
* after trying all these methods, no value is available for one or both
|
||
|
* dimensions, the corresponding dimension of aFallbackSize is used instead.
|
||
|
*/
|
||
|
static CSSIntSize
|
||
|
ComputeSizeForDrawingWithFallback(imgIContainer* aImage,
|
||
|
const nsSize& aFallbackSize);
|
||
|
|
||
|
/**
|
||
|
* Given a source area of an image (in appunits) and a destination area
|
||
|
* that we want to map that source area too, computes the area that
|
||
|
* would be covered by the whole image. This is useful for passing to
|
||
|
* the aDest parameter of DrawImage, when we want to draw a subimage
|
||
|
* of an overall image.
|
||
|
*/
|
||
|
static nsRect GetWholeImageDestination(const nsSize& aWholeImageSize,
|
||
|
const nsRect& aImageSourceArea,
|
||
|
const nsRect& aDestArea);
|
||
|
|
||
|
/**
|
||
|
* Given an image container and an orientation, returns an image container
|
||
|
* that contains the same image, reoriented appropriately. May return the
|
||
|
* original image container if no changes are needed.
|
||
|
*
|
||
|
* @param aContainer The image container to apply the orientation to.
|
||
|
* @param aOrientation The desired orientation.
|
||
|
*/
|
||
|
static already_AddRefed<imgIContainer>
|
||
|
OrientImage(imgIContainer* aContainer,
|
||
|
const nsStyleImageOrientation& aOrientation);
|
||
|
|
||
|
/**
|
||
|
* Determine if any corner radius is of nonzero size
|
||
|
* @param aCorners the |nsStyleCorners| object to check
|
||
|
* @return true unless all the coordinates are 0%, 0 or null.
|
||
|
*
|
||
|
* A corner radius with one dimension zero and one nonzero is
|
||
|
* treated as a nonzero-radius corner, even though it will end up
|
||
|
* being rendered like a zero-radius corner. This is because such
|
||
|
* corners are not expected to appear outside of test cases, and it's
|
||
|
* simpler to implement the test this way.
|
||
|
*/
|
||
|
static bool HasNonZeroCorner(const nsStyleCorners& aCorners);
|
||
|
|
||
|
/**
|
||
|
* Determine if there is any corner radius on corners adjacent to the
|
||
|
* given side.
|
||
|
*/
|
||
|
static bool HasNonZeroCornerOnSide(const nsStyleCorners& aCorners,
|
||
|
mozilla::css::Side aSide);
|
||
|
|
||
|
/**
|
||
|
* Determine if a widget is likely to require transparency or translucency.
|
||
|
* @param aBackgroundFrame The frame that the background is set on. For
|
||
|
* <window>s, this will be the canvas frame.
|
||
|
* @param aCSSRootFrame The frame that holds CSS properties affecting
|
||
|
* the widget's transparency. For menupopups,
|
||
|
* aBackgroundFrame and aCSSRootFrame will be the
|
||
|
* same.
|
||
|
* @return a value suitable for passing to SetWindowTranslucency.
|
||
|
*/
|
||
|
static nsTransparencyMode GetFrameTransparency(nsIFrame* aBackgroundFrame,
|
||
|
nsIFrame* aCSSRootFrame);
|
||
|
|
||
|
/**
|
||
|
* A frame is a popup if it has its own floating window. Menus, panels
|
||
|
* and combobox dropdowns are popups.
|
||
|
*/
|
||
|
static bool IsPopup(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Find the nearest "display root". This is the nearest enclosing
|
||
|
* popup frame or the root prescontext's root frame.
|
||
|
*/
|
||
|
static nsIFrame* GetDisplayRootFrame(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the reference frame that would be used when constructing a
|
||
|
* display item for this frame. (Note, however, that
|
||
|
* nsDisplayTransform use the reference frame appropriate for their
|
||
|
* GetTransformRootFrame(), rather than using their own frame as a
|
||
|
* reference frame.)
|
||
|
*
|
||
|
* This duplicates some of the logic of GetDisplayRootFrame above and
|
||
|
* of nsDisplayListBuilder::FindReferenceFrameFor.
|
||
|
*
|
||
|
* If you have an nsDisplayListBuilder, you should get the reference
|
||
|
* frame from it instead of calling this.
|
||
|
*/
|
||
|
static nsIFrame* GetReferenceFrame(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get the parent of this frame, except if that parent is part of a
|
||
|
* preserve-3d hierarchy, get the parent of the root of the
|
||
|
* preserve-3d hierarchy.
|
||
|
*
|
||
|
* (This is used as the starting point for reference frame computation
|
||
|
* for nsDisplayTransform display items.)
|
||
|
*/
|
||
|
static nsIFrame* GetTransformRootFrame(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Get textrun construction flags determined by a given style; in particular
|
||
|
* some combination of:
|
||
|
* -- TEXT_DISABLE_OPTIONAL_LIGATURES if letter-spacing is in use
|
||
|
* -- TEXT_OPTIMIZE_SPEED if the text-rendering CSS property and font size
|
||
|
* and prefs indicate we should be optimizing for speed over quality
|
||
|
*/
|
||
|
static uint32_t GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
|
||
|
const nsStyleFont* aStyleFont,
|
||
|
const nsStyleText* aStyleText,
|
||
|
nscoord aLetterSpacing);
|
||
|
|
||
|
/**
|
||
|
* Get orientation flags for textrun construction.
|
||
|
*/
|
||
|
static uint32_t GetTextRunOrientFlagsForStyle(nsStyleContext* aStyleContext);
|
||
|
|
||
|
/**
|
||
|
* Takes two rectangles whose origins must be the same, and computes
|
||
|
* the difference between their union and their intersection as two
|
||
|
* rectangles. (This difference is a superset of the difference
|
||
|
* between the two rectangles.)
|
||
|
*/
|
||
|
static void GetRectDifferenceStrips(const nsRect& aR1, const nsRect& aR2,
|
||
|
nsRect* aHStrip, nsRect* aVStrip);
|
||
|
|
||
|
/**
|
||
|
* Get a device context that can be used to get up-to-date device
|
||
|
* dimensions for the given window. For some reason, this is more
|
||
|
* complicated than it ought to be in multi-monitor situations.
|
||
|
*/
|
||
|
static nsDeviceContext*
|
||
|
GetDeviceContextForScreenInfo(nsPIDOMWindow* aWindow);
|
||
|
|
||
|
/**
|
||
|
* Some frames with 'position: fixed' (nsStylePosition::mDisplay ==
|
||
|
* NS_STYLE_POSITION_FIXED) are not really fixed positioned, since
|
||
|
* they're inside an element with -moz-transform. This function says
|
||
|
* whether such an element is a real fixed-pos element.
|
||
|
*/
|
||
|
static bool IsReallyFixedPos(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Obtain a SourceSurface from the given DOM element, if possible.
|
||
|
* This obtains the most natural surface from the element; that
|
||
|
* is, the one that can be obtained with the fewest conversions.
|
||
|
*
|
||
|
* The flags below can modify the behaviour of this function. The
|
||
|
* result is returned as a SurfaceFromElementResult struct, also
|
||
|
* defined below.
|
||
|
*
|
||
|
* Currently, this will do:
|
||
|
* - HTML Canvas elements: will return the underlying canvas surface
|
||
|
* - HTML Video elements: will return the current video frame
|
||
|
* - Image elements: will return the image
|
||
|
*
|
||
|
* The above results are modified by the below flags (copying,
|
||
|
* forcing image surface, etc.).
|
||
|
*/
|
||
|
|
||
|
enum {
|
||
|
/* When creating a new surface, create an image surface */
|
||
|
SFE_WANT_IMAGE_SURFACE = 1 << 0,
|
||
|
/* Whether to extract the first frame (as opposed to the
|
||
|
current frame) in the case that the element is an image. */
|
||
|
SFE_WANT_FIRST_FRAME = 1 << 1,
|
||
|
/* Whether we should skip colorspace/gamma conversion */
|
||
|
SFE_NO_COLORSPACE_CONVERSION = 1 << 2,
|
||
|
/* Specifies that the caller wants unpremultiplied pixel data.
|
||
|
If this is can be done efficiently, the result will be a
|
||
|
DataSourceSurface and mIsPremultiplied with be set to false. */
|
||
|
SFE_PREFER_NO_PREMULTIPLY_ALPHA = 1 << 3,
|
||
|
/* Whether we should skip getting a surface for vector images and
|
||
|
return a DirectDrawInfo containing an imgIContainer instead. */
|
||
|
SFE_NO_RASTERIZING_VECTORS = 1 << 4
|
||
|
};
|
||
|
|
||
|
struct DirectDrawInfo {
|
||
|
/* imgIContainer to directly draw to a context */
|
||
|
nsCOMPtr<imgIContainer> mImgContainer;
|
||
|
/* which frame to draw */
|
||
|
uint32_t mWhichFrame;
|
||
|
/* imgIContainer flags to use when drawing */
|
||
|
uint32_t mDrawingFlags;
|
||
|
};
|
||
|
|
||
|
struct SurfaceFromElementResult {
|
||
|
friend class mozilla::dom::CanvasRenderingContext2D;
|
||
|
friend class nsLayoutUtils;
|
||
|
|
||
|
/* If SFEResult contains a valid surface, it either mLayersImage or mSourceSurface
|
||
|
* will be non-null, and GetSourceSurface() will not be null.
|
||
|
*
|
||
|
* For valid surfaces, mSourceSurface may be null if mLayersImage is non-null, but
|
||
|
* GetSourceSurface() will create mSourceSurface from mLayersImage when called.
|
||
|
*/
|
||
|
|
||
|
/* Video elements (at least) often are already decoded as layers::Images. */
|
||
|
RefPtr<mozilla::layers::Image> mLayersImage;
|
||
|
|
||
|
protected:
|
||
|
/* GetSourceSurface() fills this and returns its non-null value if this SFEResult
|
||
|
* was successful. */
|
||
|
RefPtr<mozilla::gfx::SourceSurface> mSourceSurface;
|
||
|
|
||
|
public:
|
||
|
/* Contains info for drawing when there is no mSourceSurface. */
|
||
|
DirectDrawInfo mDrawInfo;
|
||
|
|
||
|
/* The size of the surface */
|
||
|
mozilla::gfx::IntSize mSize;
|
||
|
/* The principal associated with the element whose surface was returned.
|
||
|
If there is a surface, this will never be null. */
|
||
|
nsCOMPtr<nsIPrincipal> mPrincipal;
|
||
|
/* The image request, if the element is an nsIImageLoadingContent */
|
||
|
nsCOMPtr<imgIRequest> mImageRequest;
|
||
|
/* Whether the element was "write only", that is, the bits should not be exposed to content */
|
||
|
bool mIsWriteOnly;
|
||
|
/* Whether the element was still loading. Some consumers need to handle
|
||
|
this case specially. */
|
||
|
bool mIsStillLoading;
|
||
|
/* Whether the element has a valid size. */
|
||
|
bool mHasSize;
|
||
|
/* Whether the element used CORS when loading. */
|
||
|
bool mCORSUsed;
|
||
|
/* Whether the returned image contains premultiplied pixel data */
|
||
|
bool mIsPremultiplied;
|
||
|
|
||
|
// Methods:
|
||
|
|
||
|
SurfaceFromElementResult();
|
||
|
|
||
|
// Gets mSourceSurface, or makes a SourceSurface from mLayersImage.
|
||
|
const RefPtr<mozilla::gfx::SourceSurface>& GetSourceSurface();
|
||
|
};
|
||
|
|
||
|
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::Element *aElement,
|
||
|
uint32_t aSurfaceFlags,
|
||
|
RefPtr<DrawTarget>& aTarget);
|
||
|
|
||
|
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::Element *aElement,
|
||
|
uint32_t aSurfaceFlags = 0) {
|
||
|
RefPtr<DrawTarget> target = nullptr;
|
||
|
return SurfaceFromElement(aElement, aSurfaceFlags, target);
|
||
|
}
|
||
|
|
||
|
static SurfaceFromElementResult SurfaceFromElement(nsIImageLoadingContent *aElement,
|
||
|
uint32_t aSurfaceFlags,
|
||
|
RefPtr<DrawTarget>& aTarget);
|
||
|
// Need an HTMLImageElement overload, because otherwise the
|
||
|
// nsIImageLoadingContent and mozilla::dom::Element overloads are ambiguous
|
||
|
// for HTMLImageElement.
|
||
|
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::HTMLImageElement *aElement,
|
||
|
uint32_t aSurfaceFlags,
|
||
|
RefPtr<DrawTarget>& aTarget);
|
||
|
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::HTMLCanvasElement *aElement,
|
||
|
uint32_t aSurfaceFlags,
|
||
|
RefPtr<DrawTarget>& aTarget);
|
||
|
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::HTMLVideoElement *aElement,
|
||
|
uint32_t aSurfaceFlags,
|
||
|
RefPtr<DrawTarget>& aTarget);
|
||
|
|
||
|
/**
|
||
|
* When the document is editable by contenteditable attribute of its root
|
||
|
* content or body content.
|
||
|
*
|
||
|
* Be aware, this returns nullptr if it's in designMode.
|
||
|
*
|
||
|
* For example:
|
||
|
*
|
||
|
* <html contenteditable="true"><body></body></html>
|
||
|
* returns the <html>.
|
||
|
*
|
||
|
* <html><body contenteditable="true"></body></html>
|
||
|
* <body contenteditable="true"></body>
|
||
|
* With these cases, this returns the <body>.
|
||
|
* NOTE: The latter case isn't created normally, however, it can be
|
||
|
* created by script with XHTML.
|
||
|
*
|
||
|
* <body><p contenteditable="true"></p></body>
|
||
|
* returns nullptr because <body> isn't editable.
|
||
|
*/
|
||
|
static nsIContent*
|
||
|
GetEditableRootContentByContentEditable(nsIDocument* aDocument);
|
||
|
|
||
|
/**
|
||
|
* Returns true if the passed in prescontext needs the dark grey background
|
||
|
* that goes behind the page of a print preview presentation.
|
||
|
*/
|
||
|
static bool NeedsPrintPreviewBackground(nsPresContext* aPresContext);
|
||
|
|
||
|
/**
|
||
|
* Adds all font faces used in the frame tree starting from aFrame
|
||
|
* to the list aFontFaceList.
|
||
|
*/
|
||
|
static nsresult GetFontFacesForFrames(nsIFrame* aFrame,
|
||
|
nsFontFaceList* aFontFaceList);
|
||
|
|
||
|
/**
|
||
|
* Adds all font faces used within the specified range of text in aFrame,
|
||
|
* and optionally its continuations, to the list in aFontFaceList.
|
||
|
* Pass 0 and INT32_MAX for aStartOffset and aEndOffset to specify the
|
||
|
* entire text is to be considered.
|
||
|
*/
|
||
|
static nsresult GetFontFacesForText(nsIFrame* aFrame,
|
||
|
int32_t aStartOffset,
|
||
|
int32_t aEndOffset,
|
||
|
bool aFollowContinuations,
|
||
|
nsFontFaceList* aFontFaceList);
|
||
|
|
||
|
/**
|
||
|
* Walks the frame tree starting at aFrame looking for textRuns.
|
||
|
* If |clear| is true, just clears the TEXT_RUN_MEMORY_ACCOUNTED flag
|
||
|
* on each textRun found (and |aMallocSizeOf| is not used).
|
||
|
* If |clear| is false, adds the storage used for each textRun to the
|
||
|
* total, and sets the TEXT_RUN_MEMORY_ACCOUNTED flag to avoid double-
|
||
|
* accounting. (Runs with this flag already set will be skipped.)
|
||
|
* Expected usage pattern is therefore to call twice:
|
||
|
* (void)SizeOfTextRunsForFrames(rootFrame, nullptr, true);
|
||
|
* total = SizeOfTextRunsForFrames(rootFrame, mallocSizeOf, false);
|
||
|
*/
|
||
|
static size_t SizeOfTextRunsForFrames(nsIFrame* aFrame,
|
||
|
mozilla::MallocSizeOf aMallocSizeOf,
|
||
|
bool clear);
|
||
|
|
||
|
/**
|
||
|
* Given a frame with possibly animated content, finds the content node
|
||
|
* that contains its animations as well as the frame's pseudo-element type
|
||
|
* relative to the resulting content node. Returns true if animated content
|
||
|
* was found, otherwise it returns false and the output parameters are
|
||
|
* undefined.
|
||
|
*/
|
||
|
static bool GetAnimationContent(const nsIFrame* aFrame,
|
||
|
nsIContent* &aContentResult,
|
||
|
nsCSSPseudoElements::Type &aPseudoTypeResult);
|
||
|
|
||
|
/**
|
||
|
* Returns true if the frame has current (i.e. running or scheduled-to-run)
|
||
|
* animations or transitions for the property.
|
||
|
*/
|
||
|
static bool HasCurrentAnimationOfProperty(const nsIFrame* aFrame,
|
||
|
nsCSSProperty aProperty);
|
||
|
|
||
|
/**
|
||
|
* Returns true if the frame has any current CSS transitions.
|
||
|
* A current transition is any transition that has not yet finished playing
|
||
|
* including paused transitions.
|
||
|
*/
|
||
|
static bool HasCurrentTransitions(const nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Returns true if the frame has any current animations or transitions
|
||
|
* for any of the specified properties.
|
||
|
*/
|
||
|
static bool HasCurrentAnimationsForProperties(const nsIFrame* aFrame,
|
||
|
const nsCSSProperty* aProperties,
|
||
|
size_t aPropertyCount);
|
||
|
|
||
|
/**
|
||
|
* Checks if off-main-thread animations are enabled.
|
||
|
*/
|
||
|
static bool AreAsyncAnimationsEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks if we should warn about animations that can't be async
|
||
|
*/
|
||
|
static bool IsAnimationLoggingEnabled();
|
||
|
|
||
|
/**
|
||
|
* Find a suitable scale for a element (aFrame's content) over the course of any
|
||
|
* animations and transitions of the CSS transform property on the
|
||
|
* element that run on the compositor thread.
|
||
|
* It will check the maximum and minimum scale during the animations and
|
||
|
* transitions and return a suitable value for performance and quality.
|
||
|
* Will return scale(1,1) if there are no such animations.
|
||
|
* Always returns a positive value.
|
||
|
* @param aVisibleSize is the size of the area we want to paint
|
||
|
* @param aDisplaySize is the size of the display area of the pres context
|
||
|
*/
|
||
|
static gfxSize ComputeSuitableScaleForAnimation(const nsIFrame* aFrame,
|
||
|
const nsSize& aVisibleSize,
|
||
|
const nsSize& aDisplaySize);
|
||
|
|
||
|
/**
|
||
|
* Checks if we should forcibly use nearest pixel filtering for the
|
||
|
* background.
|
||
|
*/
|
||
|
static bool UseBackgroundNearestFiltering();
|
||
|
|
||
|
/**
|
||
|
* Checks whether we want to use the GPU to scale images when
|
||
|
* possible.
|
||
|
*/
|
||
|
static bool GPUImageScalingEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks whether we want to layerize animated images whenever possible.
|
||
|
*/
|
||
|
static bool AnimatedImageLayersEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks if we should enable parsing for CSS Filters.
|
||
|
*/
|
||
|
static bool CSSFiltersEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks if we should enable parsing for CSS clip-path basic shapes.
|
||
|
*/
|
||
|
static bool CSSClipPathShapesEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks whether support for the CSS-wide "unset" value is enabled.
|
||
|
*/
|
||
|
static bool UnsetValueEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks whether support for the CSS grid-template-{columns,rows} 'subgrid X'
|
||
|
* value is enabled.
|
||
|
*/
|
||
|
static bool IsGridTemplateSubgridValueEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks whether support for the CSS text-align (and -moz-text-align-last)
|
||
|
* 'true' value is enabled.
|
||
|
*/
|
||
|
static bool IsTextAlignTrueValueEnabled();
|
||
|
|
||
|
/**
|
||
|
* Checks if CSS variables are currently enabled.
|
||
|
*/
|
||
|
static bool CSSVariablesEnabled()
|
||
|
{
|
||
|
return sCSSVariablesEnabled;
|
||
|
}
|
||
|
|
||
|
static bool InterruptibleReflowEnabled()
|
||
|
{
|
||
|
return sInterruptibleReflowEnabled;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Unions the overflow areas of the children of aFrame with aOverflowAreas.
|
||
|
* aSkipChildLists specifies any child lists that should be skipped.
|
||
|
* kSelectPopupList and kPopupList are always skipped.
|
||
|
*/
|
||
|
static void UnionChildOverflow(nsIFrame* aFrame,
|
||
|
nsOverflowAreas& aOverflowAreas,
|
||
|
mozilla::layout::FrameChildListIDs aSkipChildLists =
|
||
|
mozilla::layout::FrameChildListIDs());
|
||
|
|
||
|
/**
|
||
|
* Return the font size inflation *ratio* for a given frame. This is
|
||
|
* the factor by which font sizes should be inflated; it is never
|
||
|
* smaller than 1.
|
||
|
*/
|
||
|
static float FontSizeInflationFor(const nsIFrame *aFrame);
|
||
|
|
||
|
/**
|
||
|
* Perform the first half of the computation of FontSizeInflationFor
|
||
|
* (see above).
|
||
|
* This includes determining whether inflation should be performed
|
||
|
* within this container and returning 0 if it should not be.
|
||
|
*
|
||
|
* The result is guaranteed not to vary between line participants
|
||
|
* (inlines, text frames) within a line.
|
||
|
*
|
||
|
* The result should not be used directly since font sizes slightly
|
||
|
* above the minimum should always be adjusted as done by
|
||
|
* FontSizeInflationInner.
|
||
|
*/
|
||
|
static nscoord InflationMinFontSizeFor(const nsIFrame *aFrame);
|
||
|
|
||
|
/**
|
||
|
* Perform the second half of the computation done by
|
||
|
* FontSizeInflationFor (see above).
|
||
|
*
|
||
|
* aMinFontSize must be the result of one of the
|
||
|
* InflationMinFontSizeFor methods above.
|
||
|
*/
|
||
|
static float FontSizeInflationInner(const nsIFrame *aFrame,
|
||
|
nscoord aMinFontSize);
|
||
|
|
||
|
static bool FontSizeInflationEnabled(nsPresContext *aPresContext);
|
||
|
|
||
|
/**
|
||
|
* See comment above "font.size.inflation.maxRatio" in
|
||
|
* modules/libpref/src/init/all.js .
|
||
|
*/
|
||
|
static uint32_t FontSizeInflationMaxRatio() {
|
||
|
return sFontSizeInflationMaxRatio;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* See comment above "font.size.inflation.emPerLine" in
|
||
|
* modules/libpref/src/init/all.js .
|
||
|
*/
|
||
|
static uint32_t FontSizeInflationEmPerLine() {
|
||
|
return sFontSizeInflationEmPerLine;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* See comment above "font.size.inflation.minTwips" in
|
||
|
* modules/libpref/src/init/all.js .
|
||
|
*/
|
||
|
static uint32_t FontSizeInflationMinTwips() {
|
||
|
return sFontSizeInflationMinTwips;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* See comment above "font.size.inflation.lineThreshold" in
|
||
|
* modules/libpref/src/init/all.js .
|
||
|
*/
|
||
|
static uint32_t FontSizeInflationLineThreshold() {
|
||
|
return sFontSizeInflationLineThreshold;
|
||
|
}
|
||
|
|
||
|
static bool FontSizeInflationForceEnabled() {
|
||
|
return sFontSizeInflationForceEnabled;
|
||
|
}
|
||
|
|
||
|
static bool FontSizeInflationDisabledInMasterProcess() {
|
||
|
return sFontSizeInflationDisabledInMasterProcess;
|
||
|
}
|
||
|
|
||
|
static bool SVGTransformBoxEnabled() {
|
||
|
return sSVGTransformBoxEnabled;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* See comment above "font.size.inflation.mappingIntercept" in
|
||
|
* modules/libpref/src/init/all.js .
|
||
|
*/
|
||
|
static int32_t FontSizeInflationMappingIntercept() {
|
||
|
return sFontSizeInflationMappingIntercept;
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Returns true if the nglayout.debug.invalidation pref is set to true.
|
||
|
* Note that sInvalidationDebuggingIsEnabled is declared outside this function to
|
||
|
* allow it to be accessed an manipulated from breakpoint conditions.
|
||
|
*/
|
||
|
static bool InvalidationDebuggingIsEnabled() {
|
||
|
return sInvalidationDebuggingIsEnabled || getenv("MOZ_DUMP_INVALIDATION") != 0;
|
||
|
}
|
||
|
|
||
|
static void Initialize();
|
||
|
static void Shutdown();
|
||
|
|
||
|
/**
|
||
|
* Register an imgIRequest object with a refresh driver.
|
||
|
*
|
||
|
* @param aPresContext The nsPresContext whose refresh driver we want to
|
||
|
* register with.
|
||
|
* @param aRequest A pointer to the imgIRequest object which the client wants
|
||
|
* to register with the refresh driver.
|
||
|
* @param aRequestRegistered A pointer to a boolean value which indicates
|
||
|
* whether the given image request is registered. If
|
||
|
* *aRequestRegistered is true, then this request will not be
|
||
|
* registered again. If the request is registered by this function,
|
||
|
* then *aRequestRegistered will be set to true upon the completion of
|
||
|
* this function.
|
||
|
*
|
||
|
*/
|
||
|
static void RegisterImageRequest(nsPresContext* aPresContext,
|
||
|
imgIRequest* aRequest,
|
||
|
bool* aRequestRegistered);
|
||
|
|
||
|
/**
|
||
|
* Register an imgIRequest object with a refresh driver, but only if the
|
||
|
* request is for an image that is animated.
|
||
|
*
|
||
|
* @param aPresContext The nsPresContext whose refresh driver we want to
|
||
|
* register with.
|
||
|
* @param aRequest A pointer to the imgIRequest object which the client wants
|
||
|
* to register with the refresh driver.
|
||
|
* @param aRequestRegistered A pointer to a boolean value which indicates
|
||
|
* whether the given image request is registered. If
|
||
|
* *aRequestRegistered is true, then this request will not be
|
||
|
* registered again. If the request is registered by this function,
|
||
|
* then *aRequestRegistered will be set to true upon the completion of
|
||
|
* this function.
|
||
|
*
|
||
|
*/
|
||
|
static void RegisterImageRequestIfAnimated(nsPresContext* aPresContext,
|
||
|
imgIRequest* aRequest,
|
||
|
bool* aRequestRegistered);
|
||
|
|
||
|
/**
|
||
|
* Deregister an imgIRequest object from a refresh driver.
|
||
|
*
|
||
|
* @param aPresContext The nsPresContext whose refresh driver we want to
|
||
|
* deregister from.
|
||
|
* @param aRequest A pointer to the imgIRequest object with which the client
|
||
|
* previously registered and now wants to deregister from the refresh
|
||
|
* driver.
|
||
|
* @param aRequestRegistered A pointer to a boolean value which indicates
|
||
|
* whether the given image request is registered. If
|
||
|
* *aRequestRegistered is false, then this request will not be
|
||
|
* deregistered. If the request is deregistered by this function,
|
||
|
* then *aRequestRegistered will be set to false upon the completion of
|
||
|
* this function.
|
||
|
*/
|
||
|
static void DeregisterImageRequest(nsPresContext* aPresContext,
|
||
|
imgIRequest* aRequest,
|
||
|
bool* aRequestRegistered);
|
||
|
|
||
|
/**
|
||
|
* Shim to nsCSSFrameConstructor::PostRestyleEvent. Exists so that we
|
||
|
* can avoid including nsCSSFrameConstructor.h and all its dependencies
|
||
|
* in content files.
|
||
|
*/
|
||
|
static void PostRestyleEvent(mozilla::dom::Element* aElement,
|
||
|
nsRestyleHint aRestyleHint,
|
||
|
nsChangeHint aMinChangeHint);
|
||
|
|
||
|
/**
|
||
|
* Updates a pair of x and y distances if a given point is closer to a given
|
||
|
* rectangle than the original distance values. If aPoint is closer to
|
||
|
* aRect than aClosestXDistance and aClosestYDistance indicate, then those
|
||
|
* two variables are updated with the distance between aPoint and aRect,
|
||
|
* and true is returned. If aPoint is not closer, then aClosestXDistance
|
||
|
* and aClosestYDistance are left unchanged, and false is returned.
|
||
|
*
|
||
|
* Distances are measured in the two dimensions separately; a closer x
|
||
|
* distance beats a closer y distance.
|
||
|
*/
|
||
|
template<typename PointType, typename RectType, typename CoordType>
|
||
|
static bool PointIsCloserToRect(PointType aPoint, const RectType& aRect,
|
||
|
CoordType& aClosestXDistance,
|
||
|
CoordType& aClosestYDistance);
|
||
|
/**
|
||
|
* Computes the box shadow rect for the frame, or returns an empty rect if
|
||
|
* there are no shadows.
|
||
|
*
|
||
|
* @param aFrame Frame to compute shadows for.
|
||
|
* @param aFrameSize Size of aFrame (in case it hasn't been set yet).
|
||
|
*/
|
||
|
static nsRect GetBoxShadowRectForFrame(nsIFrame* aFrame, const nsSize& aFrameSize);
|
||
|
|
||
|
#ifdef DEBUG
|
||
|
/**
|
||
|
* Assert that there are no duplicate continuations of the same frame
|
||
|
* within aFrameList. Optimize the tests by assuming that all frames
|
||
|
* in aFrameList have parent aContainer.
|
||
|
*/
|
||
|
static void
|
||
|
AssertNoDuplicateContinuations(nsIFrame* aContainer,
|
||
|
const nsFrameList& aFrameList);
|
||
|
|
||
|
/**
|
||
|
* Assert that the frame tree rooted at |aSubtreeRoot| is empty, i.e.,
|
||
|
* that it contains no first-in-flows.
|
||
|
*/
|
||
|
static void
|
||
|
AssertTreeOnlyEmptyNextInFlows(nsIFrame *aSubtreeRoot);
|
||
|
#endif
|
||
|
|
||
|
/**
|
||
|
* Helper method to get touch action behaviour from the frame
|
||
|
*/
|
||
|
static uint32_t
|
||
|
GetTouchActionFromFrame(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Helper method to transform |aBounds| from aFrame to aAncestorFrame,
|
||
|
* and combine it with |aPreciseTargetDest| if it is axis-aligned, or
|
||
|
* combine it with |aImpreciseTargetDest| if not.
|
||
|
*/
|
||
|
static void
|
||
|
TransformToAncestorAndCombineRegions(
|
||
|
const nsRect& aBounds,
|
||
|
nsIFrame* aFrame,
|
||
|
const nsIFrame* aAncestorFrame,
|
||
|
nsRegion* aPreciseTargetDest,
|
||
|
nsRegion* aImpreciseTargetDest);
|
||
|
|
||
|
/**
|
||
|
* Determine if aImageFrame (which is an nsImageFrame, nsImageControlFrame, or
|
||
|
* nsSVGImageFrame) is visible or close to being visible via scrolling and
|
||
|
* update the presshell with this knowledge.
|
||
|
*/
|
||
|
static void
|
||
|
UpdateImageVisibilityForFrame(nsIFrame* aImageFrame);
|
||
|
|
||
|
/**
|
||
|
* Populate aOutSize with the size of the content viewer corresponding
|
||
|
* to the given prescontext. Return true if the size was set, false
|
||
|
* otherwise.
|
||
|
*/
|
||
|
static bool
|
||
|
GetContentViewerSize(nsPresContext* aPresContext,
|
||
|
LayoutDeviceIntSize& aOutSize);
|
||
|
|
||
|
/**
|
||
|
* Calculate the compostion size for a frame. See FrameMetrics.h for
|
||
|
* defintion of composition size (or bounds).
|
||
|
* Note that for the root content document's root scroll frame (RCD-RSF),
|
||
|
* the returned size does not change as the document's resolution changes,
|
||
|
* but for all other frames it does. This means that callers that pass in
|
||
|
* a frame that may or may not be the RCD-RSF (which is most callers),
|
||
|
* are likely to need special-case handling of the RCD-RSF.
|
||
|
*/
|
||
|
static nsSize
|
||
|
CalculateCompositionSizeForFrame(nsIFrame* aFrame, bool aSubtractScrollbars = true);
|
||
|
|
||
|
/**
|
||
|
* Calculate the composition size for the root scroll frame of the root
|
||
|
* content document.
|
||
|
* @param aFrame A frame in the root content document (or a descendant of it).
|
||
|
* @param aIsRootContentDocRootScrollFrame Whether aFrame is already the root
|
||
|
* scroll frame of the root content document. In this case we just
|
||
|
* use aFrame's own composition size.
|
||
|
* @param aMetrics A partially populated FrameMetrics for aFrame. Must have at
|
||
|
* least mCompositionBounds, mCumulativeResolution, and
|
||
|
* mDevPixelsPerCSSPixel set.
|
||
|
*/
|
||
|
static CSSSize
|
||
|
CalculateRootCompositionSize(nsIFrame* aFrame,
|
||
|
bool aIsRootContentDocRootScrollFrame,
|
||
|
const FrameMetrics& aMetrics);
|
||
|
|
||
|
/**
|
||
|
* Calculate the scrollable rect for a frame. See FrameMetrics.h for
|
||
|
* defintion of scrollable rect. aScrollableFrame is the scroll frame to calculate
|
||
|
* the scrollable rect for. If it's null then we calculate the scrollable rect
|
||
|
* as the rect of the root frame.
|
||
|
*/
|
||
|
static nsRect
|
||
|
CalculateScrollableRectForFrame(nsIScrollableFrame* aScrollableFrame, nsIFrame* aRootFrame);
|
||
|
|
||
|
/**
|
||
|
* Calculate the expanded scrollable rect for a frame. See FrameMetrics.h for
|
||
|
* defintion of expanded scrollable rect.
|
||
|
*/
|
||
|
static nsRect
|
||
|
CalculateExpandedScrollableRect(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Returns true if the widget owning the given frame uses asynchronous
|
||
|
* scrolling.
|
||
|
*/
|
||
|
static bool UsesAsyncScrolling(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Returns true if the widget owning the given frame has builtin APZ support
|
||
|
* enabled.
|
||
|
*/
|
||
|
static bool AsyncPanZoomEnabled(nsIFrame* aFrame);
|
||
|
|
||
|
/**
|
||
|
* Returns the current APZ Resolution Scale. When Java Pan/Zoom is
|
||
|
* enabled in Fennec it will always return 1.0.
|
||
|
*/
|
||
|
static float GetCurrentAPZResolutionScale(nsIPresShell* aShell);
|
||
|
|
||
|
/**
|
||
|
* Log a key/value pair for APZ testing during a paint.
|
||
|
* @param aManager The data will be written to the APZTestData associated
|
||
|
* with this layer manager.
|
||
|
* @param aScrollId Identifies the scroll frame to which the data pertains.
|
||
|
* @param aKey The key under which to log the data.
|
||
|
* @param aValue The value of the data to be logged.
|
||
|
*/
|
||
|
static void LogTestDataForPaint(mozilla::layers::LayerManager* aManager,
|
||
|
ViewID aScrollId,
|
||
|
const std::string& aKey,
|
||
|
const std::string& aValue) {
|
||
|
if (IsAPZTestLoggingEnabled()) {
|
||
|
DoLogTestDataForPaint(aManager, aScrollId, aKey, aValue);
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* A convenience overload of LogTestDataForPaint() that accepts any type
|
||
|
* as the value, and passes it through mozilla::ToString() to obtain a string
|
||
|
* value. The type passed must support streaming to an std::ostream.
|
||
|
*/
|
||
|
template <typename Value>
|
||
|
static void LogTestDataForPaint(mozilla::layers::LayerManager* aManager,
|
||
|
ViewID aScrollId,
|
||
|
const std::string& aKey,
|
||
|
const Value& aValue) {
|
||
|
if (IsAPZTestLoggingEnabled()) {
|
||
|
DoLogTestDataForPaint(aManager, aScrollId, aKey,
|
||
|
mozilla::ToString(aValue));
|
||
|
}
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Calculate a basic FrameMetrics with enough fields set to perform some
|
||
|
* layout calculations. The fields set are dev-to-css ratio, pres shell
|
||
|
* resolution, cumulative resolution, zoom, composition size, root
|
||
|
* composition size, scroll offset and scrollable rect.
|
||
|
*
|
||
|
* By contrast, ComputeFrameMetrics() computes all the fields, but requires
|
||
|
* extra inputs and can only be called during frame layer building.
|
||
|
*/
|
||
|
static FrameMetrics CalculateBasicFrameMetrics(nsIScrollableFrame* aScrollFrame);
|
||
|
|
||
|
/**
|
||
|
* Calculate a default set of displayport margins for the given scrollframe
|
||
|
* and set them on the scrollframe's content element. The margins are set with
|
||
|
* the default priority, which may clobber previously set margins. The repaint
|
||
|
* mode provided is passed through to the call to SetDisplayPortMargins.
|
||
|
* The |aScrollFrame| parameter must be non-null and queryable to an nsIFrame.
|
||
|
* @return true iff the call to SetDisplayPortMargins returned true.
|
||
|
*/
|
||
|
static bool CalculateAndSetDisplayPortMargins(nsIScrollableFrame* aScrollFrame,
|
||
|
RepaintMode aRepaintMode);
|
||
|
|
||
|
/**
|
||
|
* Get the display port for |aScrollFrame|'s content. If |aScrollFrame|
|
||
|
* WantsAsyncScroll() and we don't have a scrollable displayport yet (as
|
||
|
* tracked by |aBuilder|), calculate and set a display port. Returns true if
|
||
|
* there is (now) a displayport, and if so the displayport is returned in
|
||
|
* |aOutDisplayport|.
|
||
|
*
|
||
|
* Note that a displayport can either be stored as a rect, or as a base
|
||
|
* rect + margins. If it is stored as a base rect + margins, the base rect
|
||
|
* is updated to |aDisplayPortBase|, and the rect assembled from the
|
||
|
* base rect and margins is returned. If this function creates a displayport,
|
||
|
* it computes margins and stores |aDisplayPortBase| as the base rect.
|
||
|
*
|
||
|
* This is intended to be called during display list building.
|
||
|
*/
|
||
|
static bool GetOrMaybeCreateDisplayPort(nsDisplayListBuilder& aBuilder,
|
||
|
nsIFrame* aScrollFrame,
|
||
|
nsRect aDisplayPortBase,
|
||
|
nsRect* aOutDisplayport);
|
||
|
|
||
|
static nsIScrollableFrame* GetAsyncScrollableAncestorFrame(nsIFrame* aTarget);
|
||
|
|
||
|
/**
|
||
|
* Sets a zero margin display port on all proper ancestors of aFrame that
|
||
|
* are async scrollable.
|
||
|
*/
|
||
|
static void SetZeroMarginDisplayPortOnAsyncScrollableAncestors(nsIFrame* aFrame,
|
||
|
RepaintMode aRepaintMode);
|
||
|
|
||
|
static bool IsOutlineStyleAutoEnabled();
|
||
|
|
||
|
static void SetBSizeFromFontMetrics(const nsIFrame* aFrame,
|
||
|
nsHTMLReflowMetrics& aMetrics,
|
||
|
const mozilla::LogicalMargin& aFramePadding,
|
||
|
mozilla::WritingMode aLineWM,
|
||
|
mozilla::WritingMode aFrameWM);
|
||
|
|
||
|
static bool HasDocumentLevelListenersForApzAwareEvents(nsIPresShell* aShell);
|
||
|
|
||
|
/**
|
||
|
* Set the scroll port size for the purpose of clamping the scroll position
|
||
|
* for the root scroll frame of this document
|
||
|
* (see nsIDOMWindowUtils.setScrollPositionClampingScrollPortSize).
|
||
|
*/
|
||
|
static void SetScrollPositionClampingScrollPortSize(nsIPresShell* aPresShell,
|
||
|
CSSSize aSize);
|
||
|
|
||
|
static FrameMetrics ComputeFrameMetrics(nsIFrame* aForFrame,
|
||
|
nsIFrame* aScrollFrame,
|
||
|
nsIContent* aContent,
|
||
|
const nsIFrame* aReferenceFrame,
|
||
|
Layer* aLayer,
|
||
|
ViewID aScrollParentId,
|
||
|
const nsRect& aViewport,
|
||
|
const mozilla::Maybe<nsRect>& aClipRect,
|
||
|
bool aIsRoot,
|
||
|
const ContainerLayerParameters& aContainerParameters);
|
||
|
|
||
|
/**
|
||
|
* If the given scroll frame needs an area excluded from its composition
|
||
|
* bounds due to scrollbars, return that area, otherwise return an empty
|
||
|
* margin.
|
||
|
* There is no need to exclude scrollbars in the following cases:
|
||
|
* - If the scroll frame is not the RCD-RSF; in that case, the composition
|
||
|
* bounds is calculated based on the scroll port which already excludes
|
||
|
* the scrollbar area.
|
||
|
* - If the scrollbars are overlay, since then they are drawn on top of the
|
||
|
* scrollable content.
|
||
|
*/
|
||
|
static nsMargin ScrollbarAreaToExcludeFromCompositionBoundsFor(nsIFrame* aScrollFrame);
|
||
|
|
||
|
/**
|
||
|
* Looks in the layer subtree rooted at aLayer for a metrics with scroll id
|
||
|
* aScrollId. Returns true if such is found.
|
||
|
*/
|
||
|
static bool ContainsMetricsWithId(const Layer* aLayer, const ViewID& aScrollId);
|
||
|
|
||
|
static bool ShouldUseNoScriptSheet(nsIDocument* aDocument);
|
||
|
static bool ShouldUseNoFramesSheet(nsIDocument* aDocument);
|
||
|
|
||
|
/**
|
||
|
* Get the text content inside the frame. This methods traverse the
|
||
|
* frame tree and collect the content from text frames. Note that this
|
||
|
* method is similiar to nsContentUtils::GetNodeTextContent, but it at
|
||
|
* least differs from that method in the following things:
|
||
|
* 1. it skips text content inside nodes like style, script, textarea
|
||
|
* which don't generate an in-tree text frame for the text;
|
||
|
* 2. it skips elements with display property set to none;
|
||
|
* 3. it skips out-of-flow elements;
|
||
|
* 4. it includes content inside pseudo elements;
|
||
|
* 5. it may include part of text content of a node if a text frame
|
||
|
* inside is split to different continuations.
|
||
|
*/
|
||
|
static void GetFrameTextContent(nsIFrame* aFrame, nsAString& aResult);
|
||
|
|
||
|
/**
|
||
|
* Same as GetFrameTextContent but appends the result rather than sets it.
|
||
|
*/
|
||
|
static void AppendFrameTextContent(nsIFrame* aFrame, nsAString& aResult);
|
||
|
|
||
|
/**
|
||
|
* Takes a selection, and returns selection's bounding rect which is relative
|
||
|
* to its root frame.
|
||
|
*
|
||
|
* @param aSel Selection to check
|
||
|
*/
|
||
|
static nsRect GetSelectionBoundingRect(mozilla::dom::Selection* aSel);
|
||
|
|
||
|
/**
|
||
|
* Returns true if the given frame is a scrollframe and it has snap points.
|
||
|
*/
|
||
|
static bool IsScrollFrameWithSnapping(nsIFrame* aFrame);
|
||
|
|
||
|
private:
|
||
|
static uint32_t sFontSizeInflationEmPerLine;
|
||
|
static uint32_t sFontSizeInflationMinTwips;
|
||
|
static uint32_t sFontSizeInflationLineThreshold;
|
||
|
static int32_t sFontSizeInflationMappingIntercept;
|
||
|
static uint32_t sFontSizeInflationMaxRatio;
|
||
|
static bool sFontSizeInflationForceEnabled;
|
||
|
static bool sFontSizeInflationDisabledInMasterProcess;
|
||
|
static bool sInvalidationDebuggingIsEnabled;
|
||
|
static bool sCSSVariablesEnabled;
|
||
|
static bool sInterruptibleReflowEnabled;
|
||
|
static bool sSVGTransformBoxEnabled;
|
||
|
|
||
|
/**
|
||
|
* Helper function for LogTestDataForPaint().
|
||
|
*/
|
||
|
static void DoLogTestDataForPaint(mozilla::layers::LayerManager* aManager,
|
||
|
ViewID aScrollId,
|
||
|
const std::string& aKey,
|
||
|
const std::string& aValue);
|
||
|
|
||
|
static bool IsAPZTestLoggingEnabled();
|
||
|
};
|
||
|
|
||
|
template<typename PointType, typename RectType, typename CoordType>
|
||
|
/* static */ bool
|
||
|
nsLayoutUtils::PointIsCloserToRect(PointType aPoint, const RectType& aRect,
|
||
|
CoordType& aClosestXDistance,
|
||
|
CoordType& aClosestYDistance)
|
||
|
{
|
||
|
CoordType fromLeft = aPoint.x - aRect.x;
|
||
|
CoordType fromRight = aPoint.x - aRect.XMost();
|
||
|
|
||
|
CoordType xDistance;
|
||
|
if (fromLeft >= 0 && fromRight <= 0) {
|
||
|
xDistance = 0;
|
||
|
} else {
|
||
|
xDistance = std::min(abs(fromLeft), abs(fromRight));
|
||
|
}
|
||
|
|
||
|
if (xDistance <= aClosestXDistance) {
|
||
|
if (xDistance < aClosestXDistance) {
|
||
|
aClosestYDistance = std::numeric_limits<CoordType>::max();
|
||
|
}
|
||
|
|
||
|
CoordType fromTop = aPoint.y - aRect.y;
|
||
|
CoordType fromBottom = aPoint.y - aRect.YMost();
|
||
|
|
||
|
CoordType yDistance;
|
||
|
if (fromTop >= 0 && fromBottom <= 0) {
|
||
|
yDistance = 0;
|
||
|
} else {
|
||
|
yDistance = std::min(abs(fromTop), abs(fromBottom));
|
||
|
}
|
||
|
|
||
|
if (yDistance < aClosestYDistance) {
|
||
|
aClosestXDistance = xDistance;
|
||
|
aClosestYDistance = yDistance;
|
||
|
return true;
|
||
|
}
|
||
|
}
|
||
|
|
||
|
return false;
|
||
|
}
|
||
|
|
||
|
namespace mozilla {
|
||
|
|
||
|
/**
|
||
|
* Converts an nsPoint in app units to a Moz2D Point in pixels (whether those
|
||
|
* are device pixels or CSS px depends on what the caller chooses to pass as
|
||
|
* aAppUnitsPerPixel).
|
||
|
*/
|
||
|
inline gfx::Point NSPointToPoint(const nsPoint& aPoint,
|
||
|
int32_t aAppUnitsPerPixel) {
|
||
|
return gfx::Point(gfx::Float(aPoint.x) / aAppUnitsPerPixel,
|
||
|
gfx::Float(aPoint.y) / aAppUnitsPerPixel);
|
||
|
}
|
||
|
|
||
|
/**
|
||
|
* Converts an nsRect in app units to a Moz2D Rect in pixels (whether those
|
||
|
* are device pixels or CSS px depends on what the caller chooses to pass as
|
||
|
* aAppUnitsPerPixel).
|
||
|
*/
|
||
|
gfx::Rect NSRectToRect(const nsRect& aRect, double aAppUnitsPerPixel);
|
||
|
|
||
|
/**
|
||
|
* Converts an nsRect in app units to a Moz2D Rect in pixels (whether those
|
||
|
* are device pixels or CSS px depends on what the caller chooses to pass as
|
||
|
* aAppUnitsPerPixel).
|
||
|
*
|
||
|
* The passed DrawTarget is used to additionally snap the returned Rect to
|
||
|
* device pixels, if appropriate (as decided and carried out by Moz2D's
|
||
|
* MaybeSnapToDevicePixels helper, which this function calls to do any
|
||
|
* snapping).
|
||
|
*/
|
||
|
gfx::Rect NSRectToSnappedRect(const nsRect& aRect, double aAppUnitsPerPixel,
|
||
|
const gfx::DrawTarget& aSnapDT);
|
||
|
|
||
|
/**
|
||
|
* Converts, where possible, an nsRect in app units to a Moz2D Rect in pixels
|
||
|
* (whether those are device pixels or CSS px depends on what the caller
|
||
|
* chooses to pass as aAppUnitsPerPixel).
|
||
|
*
|
||
|
* If snapping results in a rectangle with zero width or height, the affected
|
||
|
* coordinates are left unsnapped
|
||
|
*/
|
||
|
gfx::Rect NSRectToNonEmptySnappedRect(const nsRect& aRect, double aAppUnitsPerPixel,
|
||
|
const gfx::DrawTarget& aSnapDT);
|
||
|
|
||
|
void StrokeLineWithSnapping(const nsPoint& aP1, const nsPoint& aP2,
|
||
|
int32_t aAppUnitsPerDevPixel,
|
||
|
gfx::DrawTarget& aDrawTarget,
|
||
|
const gfx::Pattern& aPattern,
|
||
|
const gfx::StrokeOptions& aStrokeOptions = gfx::StrokeOptions(),
|
||
|
const gfx::DrawOptions& aDrawOptions = gfx::DrawOptions());
|
||
|
|
||
|
namespace layout {
|
||
|
|
||
|
/**
|
||
|
* An RAII class which will, for the duration of its lifetime,
|
||
|
* **if** the frame given is a container for font size inflation,
|
||
|
* set the current inflation container on the pres context to null
|
||
|
* (and then, in its destructor, restore the old value).
|
||
|
*/
|
||
|
class AutoMaybeDisableFontInflation {
|
||
|
public:
|
||
|
explicit AutoMaybeDisableFontInflation(nsIFrame *aFrame);
|
||
|
|
||
|
~AutoMaybeDisableFontInflation();
|
||
|
private:
|
||
|
nsPresContext *mPresContext;
|
||
|
bool mOldValue;
|
||
|
};
|
||
|
|
||
|
void MaybeSetupTransactionIdAllocator(layers::LayerManager* aManager, nsView* aView);
|
||
|
|
||
|
} // namespace layout
|
||
|
} // namespace mozilla
|
||
|
|
||
|
class nsSetAttrRunnable : public nsRunnable
|
||
|
{
|
||
|
public:
|
||
|
nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
|
||
|
const nsAString& aValue);
|
||
|
nsSetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName,
|
||
|
int32_t aValue);
|
||
|
|
||
|
NS_DECL_NSIRUNNABLE
|
||
|
|
||
|
nsCOMPtr<nsIContent> mContent;
|
||
|
nsCOMPtr<nsIAtom> mAttrName;
|
||
|
nsAutoString mValue;
|
||
|
};
|
||
|
|
||
|
class nsUnsetAttrRunnable : public nsRunnable
|
||
|
{
|
||
|
public:
|
||
|
nsUnsetAttrRunnable(nsIContent* aContent, nsIAtom* aAttrName);
|
||
|
|
||
|
NS_DECL_NSIRUNNABLE
|
||
|
|
||
|
nsCOMPtr<nsIContent> mContent;
|
||
|
nsCOMPtr<nsIAtom> mAttrName;
|
||
|
};
|
||
|
|
||
|
#endif // nsLayoutUtils_h__
|