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gecko-dev/layout/base/nsLayoutUtils.h

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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 "mozilla/layout/FrameChildList.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 "mozilla/ToString.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 nsContainerFrame;
class gfxASurface;
class gfxDrawable;
class nsView;
class nsIFrame;
class nsStyleCoord;
class nsStyleCorners;
class gfxContext;
class nsPIDOMWindow;
class imgIRequest;
class nsIDocument;
struct gfxPoint;
struct nsStyleFont;
struct nsStyleImageOrientation;
struct nsOverflowAreas;
namespace mozilla {
class SVGImageContext;
struct IntrinsicSize;
struct ContainerLayerParameters;
class WritingMode;
namespace dom {
class DOMRectList;
class Element;
class HTMLImageElement;
class HTMLCanvasElement;
class HTMLVideoElement;
} // namespace dom
namespace layers {
class Layer;
class ClientLayerManager;
}
}
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;
};
} // 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;
typedef mozilla::CSSSize CSSSize;
typedef mozilla::LayerMargin LayerMargin;
typedef mozilla::LayoutDeviceIntRect LayoutDeviceIntRect;
/**
* 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);
MOZ_BEGIN_NESTED_ENUM_CLASS(RepaintMode, uint8_t)
Repaint,
DoNotRepaint
MOZ_END_NESTED_ENUM_CLASS(RepaintMode)
/**
* Set the display port margins for a content element to be used with a
* display port base (see SetDisplayPortBase()).
* See also nsIDOMWindowUtils.setDisplayPortMargins.
* @param aContent the content element for which to set the margins
* @param aPresShell the pres shell for the document containing the element
* @param aMargins the margins to set
* @param aAlignmentX, alignmentY the amount of pixels to which to align the
* displayport built by combining the base
* rect with the margins, in either direction
* @param aPriority a priority value to determine which margins take effect
* when multiple callers specify margins
* @param aRepaintMode whether to schedule a paint after setting the margins
*/
static void SetDisplayPortMargins(nsIContent* aContent,
nsIPresShell* aPresShell,
const LayerMargin& aMargins,
uint32_t aAlignmentX,
uint32_t aAlignmentY,
uint32_t aPriority = 0,
RepaintMode aRepaintMode = RepaintMode::Repaint);
/**
* Set the display port base rect for given element to be used with display
* port margins.
* SetDisplayPortBaseIfNotSet is like SetDisplayPortBase except it only sets
* the display port base to aBase if no display port base is currently set.
*/
static void SetDisplayPortBase(nsIContent* aContent, const nsRect& aBase);
static void SetDisplayPortBaseIfNotSet(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 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).
*/
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);
/**
* Store whether aThumbFrame wants its own layer. This sets a property on
* the frame.
*/
static void SetScrollbarThumbLayerization(nsIFrame* aThumbFrame, bool aLayerize);
/**
* Finds the nearest ancestor frame to aItem 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 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).
* The animated geometry root is required to be a descendant (or equal to)
* aItem's ReferenceFrame(), which means that we will fall back to
* returning aItem->ReferenceFrame() when we can't find another animated
* geometry root.
*/
static nsIFrame* GetAnimatedGeometryRootFor(nsDisplayItem* aItem,
nsDisplayListBuilder* aBuilder,
mozilla::layers::LayerManager* aManager);
/**
* Finds the nearest ancestor frame to aFrame that is considered to have (or
* will have) "animated geometry". This could be aFrame. Returns
* aStopAtAncestor if no closer ancestor is found.
*/
static nsIFrame* GetAnimatedGeometryRootForFrame(nsIFrame* aFrame,
const nsIFrame* aStopAtAncestor);
/**
* 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);
/**
* 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);
/**
* 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);
/**
* 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);
static nsIntRegion RoundedRectIntersectIntRect(const nsIntRect& aRoundedRect,
const gfxCornerSizes& aCorners,
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_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);
};
/**
* SelectionCaret draws carets base on range. The carets are at begin
* and end position of range's client rects. This class help us to
* collect first and last rect for drawing carets.
*/
struct FirstAndLastRectCollector : public RectCallback {
nsRect mFirstRect;
nsRect mLastRect;
bool mSeenFirstRect;
FirstAndLastRectCollector();
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 IntrinsicISizeType { MIN_ISIZE, PREF_ISIZE };
enum {
IGNORE_PADDING = 0x01
};
static nscoord IntrinsicForContainer(nsRenderingContext* aRenderingContext,
nsIFrame* aFrame,
IntrinsicISizeType 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::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);
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(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 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,
nsPresContext* aPresContext,
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,
nsPresContext* aPresContext,
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 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,
nsPresContext* aPresContext,
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,
nsPresContext* aPresContext,
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,
/* 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 {
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;
/* Whether the returned image contains premultiplied pixel data */
bool mIsPremultiplied;
};
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);
/**
* Returns true if the content node has any current animations or transitions.
* A current animation is any animation that has not yet finished playing
* including paused animations.
*/
static bool HasCurrentAnimations(nsIContent* aContent,
nsIAtom* aAnimationProperty,
nsPresContext* aPresContext);
/**
* 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 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;
}
/**
* 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);
/**
* Populate aOutRect with the bounds of the content viewer corresponding
* to the given prescontext. Return true if the bounds were set, false
* otherwise.
*/
static bool
GetContentViewerBounds(nsPresContext* aPresContext,
LayoutDeviceIntRect& aOutRect);
/**
* Calculate the compostion size for a frame. See FrameMetrics.h for
* defintion of composition size (or bounds).
*/
static nsSize
CalculateCompositionSizeForFrame(nsIFrame* aFrame);
/**
* 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);
/**
* Return whether we want to use APZ for subframes in this process.
* Currently we don't support APZ for the parent process on B2G.
*/
static bool WantSubAPZC();
/**
* Returns true if we're using asynchronous scrolling (either through
* APZ or the android frontend).
*/
static bool UsesAsyncScrolling();
/**
* 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));
}
}
/**
* 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 bool IsOutlineStyleAutoEnabled();
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;
/**
* Helper function for LogTestDataForPaint().
*/
static void DoLogTestDataForPaint(mozilla::layers::LayerManager* aManager,
ViewID aScrollId,
const std::string& aKey,
const std::string& aValue);
static bool IsAPZTestLoggingEnabled();
};
MOZ_FINISH_NESTED_ENUM_CLASS(nsLayoutUtils::RepaintMode)
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;
};
void MaybeSetupTransactionIdAllocator(layers::LayerManager* aManager, nsView* aView);
}
}
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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