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1087eac823
gecko/layout/base/nsLayoutUtils.h
Ryan VanderMeulen 1087eac823 Backed out 6 changesets (bug 982141) for Windows and OSX bustage. CLOSED TREE 
Backed out changeset 16540ab2d2cb (bug 982141)
Backed out changeset 2ad9ce9d904e (bug 982141)
Backed out changeset af219bb49c06 (bug 982141)
Backed out changeset ffe51d96e86e (bug 982141)
Backed out changeset 6642718ad3bb (bug 982141)
Backed out changeset 95b341d26f7b (bug 982141)
2014-04-10 15:27:42 -04:00

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsLayoutUtils_h__
#define nsLayoutUtils_h__
#include "mozilla/MemoryReporting.h"
#include "nsChangeHint.h"
#include "nsAutoPtr.h"
#include "nsFrameList.h"
#include "nsThreadUtils.h"
#include "nsIPrincipal.h"
#include "GraphicsFilter.h"
#include "nsCSSPseudoElements.h"
#include "FrameMetrics.h"
#include "gfx3DMatrix.h"
#include "nsIWidget.h"
#include "nsCSSProperty.h"
#include "nsStyleCoord.h"
#include "nsStyleConsts.h"
#include "nsGkAtoms.h"
#include "nsRuleNode.h"
#include "imgIContainer.h"
#include "mozilla/gfx/2D.h"
#include "Units.h"
#include <limits>
#include <algorithm>
class nsIFormControlFrame;
class nsPresContext;
class nsIContent;
class nsIAtom;
class nsIScrollableFrame;
class nsIDOMEvent;
class nsRegion;
class nsDisplayListBuilder;
class nsDisplayItem;
class nsFontMetrics;
class nsFontFaceList;
class nsIImageLoadingContent;
class nsStyleContext;
class nsBlockFrame;
class gfxASurface;
class gfxDrawable;
class nsView;
class nsIFrame;
class nsStyleCoord;
class nsStyleCorners;
class gfxContext;
class nsPIDOMWindow;
class imgIRequest;
class nsIDocument;
class gfxPoint;
struct nsStyleFont;
struct nsStyleImageOrientation;
struct nsOverflowAreas;
namespace mozilla {
class SVGImageContext;
struct IntrinsicSize;
struct ContainerLayerParameters;
namespace dom {
class DOMRectList;
class Element;
class HTMLImageElement;
class HTMLCanvasElement;
class HTMLVideoElement;
} // namespace dom
namespace layers {
class Layer;
}
}
namespace mozilla {
struct DisplayPortPropertyData {
DisplayPortPropertyData(const nsRect& aRect, uint32_t aPriority)
: mRect(aRect)
, mPriority(aPriority)
{}
nsRect mRect;
uint32_t mPriority;
};
struct DisplayPortMarginsPropertyData {
DisplayPortMarginsPropertyData(const LayerMargin& aMargins,
uint32_t aAlignmentX, uint32_t aAlignmentY,
uint32_t aPriority)
: mMargins(aMargins)
, mAlignmentX(aAlignmentX)
, mAlignmentY(aAlignmentY)
, mPriority(aPriority)
{}
LayerMargin mMargins;
uint32_t mAlignmentX;
uint32_t mAlignmentY;
uint32_t mPriority;
};
template <class AnimationsOrTransitions>
extern AnimationsOrTransitions* HasAnimationOrTransition(nsIContent* aContent,
nsIAtom* aAnimationProperty,
nsCSSProperty aProperty);
} // namespace mozilla
/**
* nsLayoutUtils is a namespace class used for various helper
* functions that are useful in multiple places in layout. The goal
* is not to define multiple copies of the same static helper.
*/
class nsLayoutUtils
{
typedef ::GraphicsFilter GraphicsFilter;
typedef mozilla::dom::DOMRectList DOMRectList;
typedef mozilla::layers::Layer Layer;
typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
typedef mozilla::gfx::SourceSurface SourceSurface;
typedef mozilla::gfx::DrawTarget DrawTarget;
typedef mozilla::gfx::Rect Rect;
public:
typedef mozilla::layers::FrameMetrics FrameMetrics;
typedef FrameMetrics::ViewID ViewID;
typedef mozilla::CSSPoint CSSPoint;
/**
* Finds previously assigned ViewID for the given content element, if any.
* Returns whether a ViewID was previously assigned.
*/
static bool FindIDFor(const nsIContent* aContent, ViewID* aOutViewId);
/**
* Finds previously assigned or generates a unique ViewID for the given
* content element.
*/
static ViewID FindOrCreateIDFor(nsIContent* aContent);
/**
* Find content for given ID.
*/
static nsIContent* FindContentFor(ViewID aId);
/**
* Find the scrollable frame for a given ID.
*/
static nsIScrollableFrame* FindScrollableFrameFor(ViewID aId);
/**
* Get display port for the given element.
*/
static bool GetDisplayPort(nsIContent* aContent, nsRect *aResult = nullptr);
/**
* Set the display port base rect for given element to be used with display
* port margins.
*/
static void SetDisplayPortBase(nsIContent* aContent, const nsRect& aBase);
/**
* Get the critical display port for the given element.
*/
static bool GetCriticalDisplayPort(nsIContent* aContent, nsRect* aResult = nullptr);
/**
* Use heuristics to figure out the child list that
* aChildFrame is currently in.
*/
static mozilla::layout::FrameChildListID GetChildListNameFor(nsIFrame* aChildFrame);
/**
* GetBeforeFrame returns the outermost :before frame of the given frame, if
* one exists. This is typically O(1). The frame passed in must be
* the first-in-flow.
*
* @param aFrame the frame whose :before is wanted
* @return the :before frame or nullptr if there isn't one
*/
static nsIFrame* GetBeforeFrame(nsIFrame* aFrame);
/**
* GetAfterFrame returns the outermost :after frame of the given frame, if one
* exists. This will walk the in-flow chain to the last-in-flow if
* needed. This function is typically O(N) in the number of child
* frames, following in-flows, etc.
*
* @param aFrame the frame whose :after is wanted
* @return the :after frame or nullptr if there isn't one
*/
static nsIFrame* GetAfterFrame(nsIFrame* aFrame);
/**
* Given a frame, search up the frame tree until we find an
* ancestor that (or the frame itself) is of type aFrameType, if any.
*
* @param aFrame the frame to start at
* @param aFrameType the frame type to look for
* @return a frame of the given type or nullptr if no
* such ancestor exists
*/
static nsIFrame* GetClosestFrameOfType(nsIFrame* aFrame, nsIAtom* aFrameType);
/**
* Given a frame, search up the frame tree until we find an
* ancestor that (or the frame itself) is a "Page" frame, if any.
*
* @param aFrame the frame to start at
* @return a frame of type nsGkAtoms::pageFrame or nullptr if no
* such ancestor exists
*/
static nsIFrame* GetPageFrame(nsIFrame* aFrame)
{
return GetClosestFrameOfType(aFrame, nsGkAtoms::pageFrame);
}
/**
* Given a frame which is the primary frame for an element,
* return the frame that has the non-psuedoelement style context for
* the content.
* This is aPrimaryFrame itself except for tableOuter frames.
*/
static nsIFrame* GetStyleFrame(nsIFrame* aPrimaryFrame);
/**
* Given a content node,
* return the frame that has the non-psuedoelement style context for
* the content. May return null.
* This is aContent->GetPrimaryFrame() except for tableOuter frames.
*/
static nsIFrame* GetStyleFrame(const nsIContent* aContent);
/**
* IsGeneratedContentFor returns true if aFrame is the outermost
* frame for generated content of type aPseudoElement for aContent.
* aFrame *might not* have the aPseudoElement pseudo-style! For example
* it might be a table outer frame and the inner table frame might
* have the pseudo-style.
*
* @param aContent the content node we're looking at. If this is
* null, then we just assume that aFrame has the right content
* pointer.
* @param aFrame the frame we're looking at
* @param aPseudoElement the pseudo type we're interested in
* @return whether aFrame is the generated aPseudoElement frame for aContent
*/
static bool IsGeneratedContentFor(nsIContent* aContent, nsIFrame* aFrame,
nsIAtom* aPseudoElement);
#ifdef DEBUG
// TODO: remove, see bug 598468.
static bool gPreventAssertInCompareTreePosition;
#endif // DEBUG
/**
* CompareTreePosition determines whether aContent1 comes before or
* after aContent2 in a preorder traversal of the content tree.
*
* @param aCommonAncestor either null, or a common ancestor of
* 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 documents)
*/
static int32_t CompareTreePosition(nsIContent* aContent1,
nsIContent* aContent2,
const nsIContent* aCommonAncestor = nullptr)
{
return DoCompareTreePosition(aContent1, aContent2, -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(nsIContent* aContent1,
nsIContent* aContent2,
int32_t aIf1Ancestor,
int32_t aIf2Ancestor,
const nsIContent* aCommonAncestor = nullptr);
/**
* CompareTreePosition determines whether aFrame1 comes before or
* after aFrame2 in a preorder traversal of the frame tree, where out
* of flow frames are treated as children of their placeholders. This is
* basically the same ordering as DoCompareTreePosition(nsIContent*) except
* that it handles anonymous content properly and there are subtleties with
* continuations.
*
* @param aCommonAncestor either null, or a common ancestor of
* 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,
nsIFrame* aFrame2,
nsIFrame* aCommonAncestor = nullptr)
{
return DoCompareTreePosition(aFrame1, aFrame2, -1, 1, aCommonAncestor);
}
static int32_t CompareTreePosition(nsIFrame* aFrame1,
nsIFrame* aFrame2,
nsTArray<nsIFrame*>& aFrame2Ancestors,
nsIFrame* aCommonAncestor = nullptr)
{
return DoCompareTreePosition(aFrame1, aFrame2, aFrame2Ancestors,
-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 nsIFrame* LastContinuationWithChild(nsIFrame* 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).
*/
static void SetFixedPositionLayerData(Layer* aLayer, const nsIFrame* aViewportFrame,
const nsRect& aAnchorRect,
const nsIFrame* aFixedPosFrame,
nsPresContext* aPresContext,
const ContainerLayerParameters& aContainerParameters);
/**
* 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);
/**
* Finds the nearest ancestor frame that is considered to have (or will have)
* "animated geometry". For example the scrolled frames of scrollframes which
* are actively being scrolled fall into this category. Frames with certain
* CSS properties that are being animated (e.g. 'left'/'top' etc) are also
* placed in this category. Frames with animated CSS transforms are not
* put in this category because they can be handled directly by
* nsDisplayTransform.
* Stop searching at aStopAtAncestor if there is no such ancestor before it
* in the ancestor chain.
* Frames with different active geometry roots are in different ThebesLayers,
* so that we can animate the geometry root by changing its transform (either
* on the main thread or in the compositor).
* This function is idempotent: a frame returned by GetAnimatedGeometryRootFor
* is always returned again if you pass it to GetAnimatedGeometryRootFor.
*/
static nsIFrame* GetAnimatedGeometryRootFor(nsIFrame* aFrame,
const nsIFrame* aStopAtAncestor = nullptr);
static nsIFrame* GetAnimatedGeometryRootFor(nsDisplayItem* aItem,
nsDisplayListBuilder* aBuilder);
/**
* 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 {
SCROLLABLE_SAME_DOC = 0x01,
SCROLLABLE_INCLUDE_HIDDEN = 0x02
};
/**
* 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 nsIntPoint 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 nsIntPoint 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, nsIntPoint aPt,
nsView* aView);
/**
* Given a matrix and a point, let T be the transformation matrix translating points
* in the coordinate space with origin aOrigin to the coordinate space used by the
* matrix. If M is the stored matrix, this function returns (T-1)MT, the matrix
* that's equivalent to aMatrix but in the coordinate space that treats aOrigin
* as the origin.
*
* @param aOrigin The origin to translate to.
* @param aMatrix The matrix to change the basis of.
* @return A matrix equivalent to aMatrix, but operating in the coordinate system with
* origin aOrigin.
*/
static gfx3DMatrix ChangeMatrixBasis(const gfxPoint3D &aOrigin, const gfx3DMatrix &aMatrix);
/**
* Find IDs corresponding to a scrollable content element in the child process.
* In correspondence with the shadow layer tree, you can use this to perform a
* hit test that corresponds to a specific shadow layer that you can then perform
* transformations on to do parent-side scrolling.
*
* @param aFrame The root frame of a stack context
* @param aTarget The rect to hit test relative to the frame origin
* @param aOutIDs All found IDs are added here
* @param aIgnoreRootScrollFrame a boolean to control if the display list
* builder should ignore the root scroll frame
*/
static nsresult GetRemoteContentIds(nsIFrame* aFrame,
const nsRect& aTarget,
nsTArray<ViewID> &aOutIDs,
bool aIgnoreRootScrollFrame);
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 gfx3DMatrix GetTransformToAncestor(nsIFrame *aFrame, const nsIFrame *aAncestor);
/**
* 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);
/**
* 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,
gfx3DMatrix* 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 gfx3DMatrix &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 gfx3DMatrix &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 gfx3DMatrix &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);
/**
* 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_ALL_CONTINUATIONS = 0x40,
PAINT_TO_WINDOW = 0x80,
PAINT_EXISTING_TRANSACTION = 0x100,
PAINT_NO_COMPOSITE = 0x200,
PAINT_COMPRESSED = 0x400
};
/**
* 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.) 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
* maanger
* 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 the (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,
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);
};
struct RectListBuilder : public RectCallback {
DOMRectList* mRectList;
RectListBuilder(DOMRectList* aList);
virtual void AddRect(const nsRect& aRect);
};
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);
/**
* 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);
/**
* 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);
/**
* 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 if TRUE, 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
* width. This considers the child's intrinsic width, its 'width',
* 'min-width', and 'max-width' properties, and its padding, border,
* and margin.
*/
enum IntrinsicWidthType { MIN_WIDTH, PREF_WIDTH };
enum {
IGNORE_PADDING = 0x01
};
static nscoord IntrinsicForContainer(nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
IntrinsicWidthType aType,
uint32_t aFlags = 0);
/*
* 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.
*/
static nscoord ComputeWidthValue(
nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
nscoord aContainingBlockWidth,
nscoord aContentEdgeToBoxSizing,
nscoord aBoxSizingToMarginEdge,
const nsStyleCoord& aCoord);
/*
* Convert nsStyleCoord to nscoord when percentages depend on the
* containing block height.
*/
static nscoord ComputeHeightDependentValue(
nscoord aContainingBlockHeight,
const nsStyleCoord& aCoord);
/*
* Likewise, but for 'height', 'min-height', or 'max-height'.
*/
static nscoord ComputeHeightValue(nscoord aContainingBlockHeight,
nscoord aContentEdgeToBoxSizingBoxEdge,
const nsStyleCoord& aCoord)
{
MOZ_ASSERT(aContainingBlockHeight != nscoord_MAX || !aCoord.HasPercent(),
"caller must deal with %% of unconstrained height");
MOZ_ASSERT(aCoord.IsCoordPercentCalcUnit());
nscoord result =
nsRuleNode::ComputeCoordPercentCalc(aCoord, aContainingBlockHeight);
// Clamp calc(), and the subtraction for box-sizing.
return std::max(0, result - aContentEdgeToBoxSizingBoxEdge);
}
static bool IsAutoHeight(const nsStyleCoord &aCoord, nscoord aCBHeight)
{
nsStyleUnit unit = aCoord.GetUnit();
return unit == eStyleUnit_Auto || // only for 'height'
unit == eStyleUnit_None || // only for 'max-height'
(aCBHeight == 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 nsSize ComputeSizeWithIntrinsicDimensions(
nsRenderingContext* aRenderingContext, nsIFrame* aFrame,
const mozilla::IntrinsicSize& aIntrinsicSize,
nsSize aIntrinsicRatio, nsSize aCBSize,
nsSize aMargin, nsSize aBorder, nsSize 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::GetPrefWidth in terms of nsIFrame::AddInlinePrefWidth
static nscoord PrefWidthFromInline(nsIFrame* aFrame,
nsRenderingContext* aRenderingContext);
// Implement nsIFrame::GetMinWidth in terms of nsIFrame::AddInlineMinWidth
static nscoord MinWidthFromInline(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);
static void DrawString(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const char16_t* aString,
int32_t aLength,
nsPoint aPoint,
nsStyleContext* aStyleContext = nullptr);
static nscoord GetStringWidth(const nsIFrame* aFrame,
nsRenderingContext* aContext,
const char16_t* aString,
int32_t aLength);
/**
* 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.
*
* Returns the baseline position relative to the top of the line.
*/
static nscoord GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
nscoord aLineHeight);
/**
* 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(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 mTop, mBaseline, mBottom;
LinePosition operator+(nscoord aOffset) const {
LinePosition result;
result.mTop = mTop + aOffset;
result.mBaseline = mBaseline + aOffset;
result.mBottom = mBottom + aOffset;
return result;
}
};
static bool GetFirstLinePosition(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(const nsIFrame* aFrame, nscoord* aResult);
/**
* Returns a y coordinate relative to this frame's origin that represents
* the logical bottom of the frame or its visible content, whichever is lower.
* Relative positioning is ignored and margins and glyph bounds are not
* considered.
* This value will be >= mRect.height() and <= overflowRect.YMost() unless
* relative positioning is applied.
*/
static nscoord CalculateContentBottom(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 GraphicsFilter 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
*/
static nsresult DrawBackgroundImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
const nsIntSize& aImageSize,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags);
/**
* 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 nsresult DrawImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty,
uint32_t aImageFlags);
/**
* Convert an nsRect to a gfxRect.
*/
static gfxRect RectToGfxRect(const nsRect& aRect,
int32_t aAppUnitsPerDevPixel);
/**
* Draw a drawable using the pixel snapping algorithm.
* 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 aDrawable The drawable we want to draw.
* @param aFilter The graphics filter we should draw with.
* @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.
*/
static void DrawPixelSnapped(nsRenderingContext* aRenderingContext,
gfxDrawable* aDrawable,
GraphicsFilter aFilter,
const nsRect& aDest,
const nsRect& aFill,
const nsPoint& aAnchor,
const nsRect& aDirty);
/**
* 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 nsresult DrawSingleUnscaledImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter 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 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 nsresult DrawSingleImage(nsRenderingContext* aRenderingContext,
imgIContainer* aImage,
GraphicsFilter aGraphicsFilter,
const nsRect& aDest,
const nsRect& aDirty,
const mozilla::SVGImageContext* aSVGContext,
uint32_t aImageFlags,
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,
nsIntSize& aImageSize,
nsSize& aIntrinsicRatio,
bool& aGotWidth,
bool& aGotHeight);
/**
* 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 nsIntSize& 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);
/**
* 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 gfxASurface 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,
/* Whether we should skip premultiplication -- the resulting
image will always be an image surface, and must not be given to
Thebes for compositing! */
SFE_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 {
SurfaceFromElementResult();
/* mSurface will contain the resulting surface, or will be nullptr on error */
nsRefPtr<gfxASurface> mSurface;
mozilla::RefPtr<SourceSurface> mSourceSurface;
/* Contains info for drawing when there is no mSourceSurface. */
DirectDrawInfo mDrawInfo;
/* The size of the surface */
gfxIntSize 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 used CORS when loading. */
bool mCORSUsed;
};
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::Element *aElement,
uint32_t aSurfaceFlags = 0,
DrawTarget *aTarget = nullptr);
static SurfaceFromElementResult SurfaceFromElement(nsIImageLoadingContent *aElement,
uint32_t aSurfaceFlags = 0,
DrawTarget *aTarget = nullptr);
// 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 = 0,
DrawTarget *aTarget = nullptr);
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::HTMLCanvasElement *aElement,
uint32_t aSurfaceFlags = 0,
DrawTarget *aTarget = nullptr);
static SurfaceFromElementResult SurfaceFromElement(mozilla::dom::HTMLVideoElement *aElement,
uint32_t aSurfaceFlags = 0,
DrawTarget *aTarget = nullptr);
/**
* 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);
/**
* Returns true if the content node has animations or transitions that can be
* performed on the compositor.
*/
static bool HasAnimationsForCompositor(nsIContent* aContent,
nsCSSProperty aProperty);
/**
* Returns true if the content node has animations or transitions for the
* property.
*/
static bool HasAnimations(nsIContent* aContent, nsCSSProperty aProperty);
/**
* 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 an element (aContent) over the course of any
* animations and transitions on the element.
* 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 is no animated scaling.
* Always return positive value.
*/
static gfxSize ComputeSuitableScaleForAnimation(nsIContent* aContent);
/**
* 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 whether support for the CSS-wide "unset" value is enabled.
*/
static bool UnsetValueEnabled();
/**
* 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 all non-popup children of aFrame with
* aOverflowAreas.
*/
static void UnionChildOverflow(nsIFrame* aFrame,
nsOverflowAreas& aOverflowAreas);
/**
* 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;
}
/**
* 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
/**
* 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);
/**
* Calculate the compostion size for a frame. See FrameMetrics.h for
* defintion of composition size (or bounds).
*/
static nsSize
CalculateCompositionSizeForFrame(nsIFrame* aFrame);
/**
* 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);
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;
};
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 {
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:
AutoMaybeDisableFontInflation(nsIFrame *aFrame);
~AutoMaybeDisableFontInflation();
private:
nsPresContext *mPresContext;
bool mOldValue;
};
}
}
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__
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