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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsLayoutUtils_h__
#define nsLayoutUtils_h__
#include "LayoutConstants.h"
#include "mozilla/MemoryReporting.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/LookAndFeel.h"
#include "mozilla/Maybe.h"
#include "mozilla/ReflowOutput.h"
#include "mozilla/RelativeTo.h"
#include "mozilla/StaticPrefs_nglayout.h"
#include "mozilla/SVGImageContext.h"
#include "mozilla/ToString.h"
#include "mozilla/TypedEnumBits.h"
#include "mozilla/UniquePtr.h"
#include "mozilla/layout/FrameChildList.h"
#include "mozilla/layers/ScrollableLayerGuid.h"
#include "mozilla/gfx/2D.h"
#include "gfx2DGlue.h"
#include "gfxPoint.h"
#include "nsBoundingMetrics.h"
#include "nsCSSPropertyIDSet.h"
#include "nsClassHashtable.h"
#include "nsGkAtoms.h"
#include "nsThreadUtils.h"
#include "ImageContainer.h" // for layers::Image
#include "Units.h"
#include <limits>
#include <algorithm>
// If you're thinking of adding a new include here, please try hard to not.
// This header file gets included just about everywhere and adding headers here
// can dramatically increase avoidable build activity. Try instead:
// - using a forward declaration
// - putting the include in the .cpp file, if it is only needed by the body
// - putting your new functions in some other less-widely-used header
class gfxContext;
class gfxFontEntry;
class imgIContainer;
class nsFrameList;
class nsPresContext;
class nsIContent;
class nsIPrincipal;
class nsIWidget;
class nsAtom;
class nsIScrollableFrame;
class nsRegion;
class nsDisplayListBuilder;
enum class nsDisplayListBuilderMode : uint8_t;
enum nsChangeHint : uint32_t;
class nsDisplayItem;
class nsDisplayList;
class nsFontMetrics;
class nsFontFaceList;
class nsIImageLoadingContent;
class nsBlockFrame;
class nsContainerFrame;
class nsView;
class nsIFrame;
class nsPIDOMWindowOuter;
class imgIRequest;
struct nsStyleFont;
struct nsOverflowAreas;
namespace mozilla {
struct AspectRatio;
class ComputedStyle;
class PresShell;
enum class PseudoStyleType : uint8_t;
class EventListenerManager;
enum class LayoutFrameType : uint8_t;
struct IntrinsicSize;
struct ContainerLayerParameters;
class WritingMode;
class DisplayItemClip;
class EffectSet;
struct ActiveScrolledRoot;
enum class ScrollOrigin : uint8_t;
enum class StyleImageOrientation : uint8_t;
namespace dom {
class CanvasRenderingContext2D;
class DOMRectList;
class Document;
class Element;
class Event;
class HTMLImageElement;
class HTMLCanvasElement;
class HTMLVideoElement;
class InspectorFontFace;
class OffscreenCanvas;
class Selection;
} // namespace dom
namespace gfx {
struct RectCornerRadii;
enum class ShapedTextFlags : uint16_t;
} // namespace gfx
namespace layers {
struct FrameMetrics;
struct ScrollMetadata;
class Image;
class StackingContextHelper;
class Layer;
} // namespace layers
} // namespace mozilla
namespace mozilla {
struct DisplayPortPropertyData {
DisplayPortPropertyData(const nsRect& aRect, uint32_t aPriority,
bool aPainted)
: mRect(aRect), mPriority(aPriority), mPainted(aPainted) {}
nsRect mRect;
uint32_t mPriority;
bool mPainted;
};
struct DisplayPortMarginsPropertyData {
DisplayPortMarginsPropertyData(const ScreenMargin& aMargins,
uint32_t aPriority, bool aPainted)
: mMargins(aMargins), mPriority(aPriority), mPainted(aPainted) {}
ScreenMargin mMargins;
uint32_t mPriority;
bool mPainted;
};
} // namespace mozilla
// For GetDisplayPort
enum class DisplayportRelativeTo { ScrollPort, ScrollFrame };
// Flags to customize the behavior of nsLayoutUtils::DrawString.
enum class DrawStringFlags {
Default = 0x0,
ForceHorizontal = 0x1 // Forces the text to be drawn horizontally.
};
MOZ_MAKE_ENUM_CLASS_BITWISE_OPERATORS(DrawStringFlags)
/**
* 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 mozilla::AspectRatio AspectRatio;
typedef mozilla::ComputedStyle ComputedStyle;
typedef mozilla::LengthPercentage LengthPercentage;
typedef mozilla::LengthPercentageOrAuto LengthPercentageOrAuto;
typedef mozilla::dom::DOMRectList DOMRectList;
typedef mozilla::layers::Layer Layer;
typedef mozilla::layers::StackingContextHelper StackingContextHelper;
typedef mozilla::ContainerLayerParameters ContainerLayerParameters;
typedef mozilla::IntrinsicSize IntrinsicSize;
typedef mozilla::RelativeTo RelativeTo;
typedef mozilla::ScrollOrigin ScrollOrigin;
typedef mozilla::ViewportType ViewportType;
typedef mozilla::gfx::SourceSurface SourceSurface;
typedef mozilla::gfx::sRGBColor sRGBColor;
typedef mozilla::gfx::DrawTarget DrawTarget;
typedef mozilla::gfx::ExtendMode ExtendMode;
typedef mozilla::gfx::SamplingFilter SamplingFilter;
typedef mozilla::gfx::Float Float;
typedef mozilla::gfx::Point Point;
typedef mozilla::gfx::Rect Rect;
typedef mozilla::gfx::RectDouble RectDouble;
typedef mozilla::gfx::Size Size;
typedef mozilla::gfx::Matrix4x4 Matrix4x4;
typedef mozilla::gfx::Matrix4x4Flagged Matrix4x4Flagged;
typedef mozilla::gfx::RectCornerRadii RectCornerRadii;
typedef mozilla::gfx::StrokeOptions StrokeOptions;
typedef mozilla::image::ImgDrawResult ImgDrawResult;
public:
typedef mozilla::layers::FrameMetrics FrameMetrics;
typedef mozilla::layers::ScrollMetadata ScrollMetadata;
typedef mozilla::layers::ScrollableLayerGuid::ViewID ViewID;
typedef mozilla::CSSPoint CSSPoint;
typedef mozilla::CSSSize CSSSize;
typedef mozilla::CSSIntSize CSSIntSize;
typedef mozilla::CSSRect CSSRect;
typedef mozilla::ScreenMargin ScreenMargin;
typedef mozilla::LayoutDeviceIntSize LayoutDeviceIntSize;
typedef mozilla::LayoutDeviceRect LayoutDeviceRect;
typedef mozilla::PresShell PresShell;
typedef mozilla::StyleGeometryBox StyleGeometryBox;
typedef mozilla::SVGImageContext SVGImageContext;
typedef mozilla::LogicalSize LogicalSize;
/**
* 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 content element.
*/
static nsIScrollableFrame* FindScrollableFrameFor(nsIContent* aContent);
/**
* Find the scrollable frame for a given ID.
*/
static nsIScrollableFrame* FindScrollableFrameFor(ViewID aId);
/**
* Find the ID for a given scrollable frame.
*/
static ViewID FindIDForScrollableFrame(nsIScrollableFrame* aScrollable);
/**
* Get display port for the given element, relative to the specified entity,
* defaulting to the scrollport.
*/
static bool GetDisplayPort(
nsIContent* aContent, nsRect* aResult,
DisplayportRelativeTo aRelativeTo = DisplayportRelativeTo::ScrollPort,
bool* aOutPainted = nullptr);
/**
* Check whether the given element has a displayport.
*/
static bool HasDisplayPort(nsIContent* aContent);
/**
* Check whether the given element has a displayport that has already
* been sent to the compositor via a layers or WR transaction.
*/
static bool HasPaintedDisplayPort(nsIContent* aContent);
/**
* Mark the displayport of a given element as having been sent to
* the compositor via a layers or WR transaction.
*/
static void MarkDisplayPortAsPainted(nsIContent* aContent);
/**
* Check whether the given frame has a displayport. It returns false
* for scrolled frames and true for the corresponding scroll frame.
* Optionally pass the child, and it only returns true if the child is the
* scrolled frame for the displayport.
*/
static bool FrameHasDisplayPort(nsIFrame* aFrame,
const nsIFrame* aScrolledFrame = nullptr);
/**
* Check if the given element has a margins based displayport but is missing a
* displayport base rect that it needs to properly compute a displayport rect.
*/
static bool IsMissingDisplayPortBaseRect(nsIContent* aContent);
/**
* Go through the IPC Channel and update displayport margins for content
* elements based on UpdateFrame messages. The messages are left in the
* queue and will be fully processed when dequeued. The aim is to paint
* the most up-to-date displayport without waiting for these message to
* go through the message queue.
*/
static void UpdateDisplayPortMarginsFromPendingMessages();
/**
* @return the display port for the given element which should be used for
* visibility testing purposes.
*
* If low-precision buffers are enabled, this is the critical display port;
* otherwise, it's the same display port returned by GetDisplayPort().
*/
static bool GetDisplayPortForVisibilityTesting(
nsIContent* aContent, nsRect* aResult,
DisplayportRelativeTo aRelativeTo = DisplayportRelativeTo::ScrollPort);
enum class RepaintMode : uint8_t { Repaint, DoNotRepaint };
/**
* Invalidate for displayport change.
*/
static void InvalidateForDisplayPortChange(
nsIContent* aContent, bool aHadDisplayPort, const nsRect& aOldDisplayPort,
const nsRect& aNewDisplayPort,
RepaintMode aRepaintMode = RepaintMode::Repaint);
/**
* 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
* @return true if the new margins were applied.
*/
static bool SetDisplayPortMargins(
nsIContent* aContent, PresShell* aPresShell, const ScreenMargin& aMargins,
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,
bool* aOutPainted = nullptr);
/**
* Check whether the given element has a critical display port.
*/
static bool HasCriticalDisplayPort(nsIContent* aContent);
/**
* If low-precision painting is turned on, delegates to
* GetCriticalDisplayPort. Otherwise, delegates to GetDisplayPort.
*/
static bool GetHighResolutionDisplayPort(nsIContent* aContent,
nsRect* aResult,
bool* aOutPainted = nullptr);
/**
* Remove the displayport for the given element.
*/
static void RemoveDisplayPort(nsIContent* aContent);
/**
* Notify the scroll frame with the given scroll id that its scroll offset
* is being sent to APZ as part of a paint-skip transaction.
*
* Normally, this notification happens during painting, after calls to
* ComputeScrollMetadata(). During paint-skipping that code is skipped,
* but it's still important for the scroll frame to be notified for
* correctness of relative scroll updates, so the code that sends the
* empty paint-skip transaction needs to call this.
*/
static void NotifyPaintSkipTransaction(ViewID aScrollId);
/**
* Use heuristics to figure out the child list that
* aChildFrame is currently in.
*/
static mozilla::layout::FrameChildListID GetChildListNameFor(
nsIFrame* aChildFrame);
/**
* Returns the ::before pseudo-element for aContent, if any.
*/
static mozilla::dom::Element* GetBeforePseudo(const nsIContent* aContent);
/**
* Returns the frame corresponding to the ::before pseudo-element for
* aContent, if any.
*/
static nsIFrame* GetBeforeFrame(const nsIContent* aContent);
/**
* Returns the ::after pseudo-element for aContent, if any.
*/
static mozilla::dom::Element* GetAfterPseudo(const nsIContent* aContent);
/**
* Returns the frame corresponding to the ::after pseudo-element for aContent,
* if any.
*/
static nsIFrame* GetAfterFrame(const nsIContent* aContent);
/**
* Returns the ::marker pseudo-element for aContent, if any.
*/
static mozilla::dom::Element* GetMarkerPseudo(const nsIContent* aContent);
/**
* Returns the frame corresponding to the ::marker pseudo-element for
* aContent, if any.
*/
static nsIFrame* GetMarkerFrame(const nsIContent* aContent);
/**
* 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
* @param aStopAt a frame to stop at after we checked it
* @return a frame of the given type or nullptr if no
* such ancestor exists
*/
static nsIFrame* GetClosestFrameOfType(nsIFrame* aFrame,
mozilla::LayoutFrameType aFrameType,
nsIFrame* aStopAt = nullptr);
/**
* 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 mozilla::LayoutFrameType::Page or nullptr if no
* such ancestor exists
*/
static nsIFrame* GetPageFrame(nsIFrame* aFrame);
/**
* Given a frame which is the primary frame for an element,
* return the frame that has the non-pseudoelement ComputedStyle for
* the content.
* This is aPrimaryFrame itself except for tableWrapper frames.
*
* Given a non-null input, this will return null if and only if its
* argument is a table wrapper frame that is mid-destruction (and its
* table frame has been destroyed).
*/
static nsIFrame* GetStyleFrame(nsIFrame* aPrimaryFrame);
static const nsIFrame* GetStyleFrame(const nsIFrame* aPrimaryFrame);
/**
* Given a content node,
* return the frame that has the non-pseudoelement ComputedStyle for
* the content. May return null.
* This is aContent->GetPrimaryFrame() except for tableWrapper frames.
*/
static nsIFrame* GetStyleFrame(const nsIContent* aContent);
/**
* The inverse of GetStyleFrame. Returns |aStyleFrame| unless it is an inner
* table frame, in which case the table wrapper frame is returned.
*/
static nsIFrame* GetPrimaryFrameFromStyleFrame(nsIFrame* aStyleFrame);
static const nsIFrame* GetPrimaryFrameFromStyleFrame(
const nsIFrame* aStyleFrame);
/**
* Similar to nsIFrame::IsPrimaryFrame except that this will return true
* for the inner table frame rather than for its wrapper frame.
*/
static bool IsPrimaryStyleFrame(const nsIFrame* aFrame);
#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(const nsIFrame* aAncestorFrame,
const nsIFrame* aFrame,
const nsIFrame* aCommonAncestor = nullptr);
/**
* Like IsProperAncestorFrame, but looks across document boundaries.
*
* Just like IsAncestorFrameCrossDoc, except that it returns false when
* aFrame == aAncestorFrame.
*/
static bool IsProperAncestorFrameCrossDoc(
const nsIFrame* aAncestorFrame, const nsIFrame* aFrame,
const 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);
static mozilla::SideBits GetSideBitsAndAdjustAnchorForFixedPositionContent(
const nsIFrame* aViewportFrame, const nsIFrame* aFixedPosFrame,
mozilla::LayerPoint* aAnchor, const Rect* aAnchorRect);
static mozilla::SideBits GetSideBitsForFixedPositionContent(
const nsIFrame* aFixedPosFrame);
/**
* Get the scroll id for the root scrollframe of the presshell of the given
* prescontext. Returns NULL_SCROLL_ID if it couldn't be found.
*/
static ViewID ScrollIdForRootScrollFrame(nsPresContext* aPresContext);
/**
* Return true if aPresContext's viewport has a displayport.
*/
static bool ViewportHasDisplayPort(nsPresContext* aPresContext);
/**
* 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);
/**
* GetScrollableFrameFor returns the scrollable frame for a scrolled frame
*/
static nsIScrollableFrame* GetScrollableFrameFor(
const nsIFrame* aScrolledFrame);
/**
* GetNearestScrollableFrameForDirection locates the first ancestor of
* aFrame (or aFrame itself) that is scrollable with overflow:scroll or
* overflow:auto in the given direction and where either the scrollbar for
* that direction is visible or the frame can be scrolled by some
* positive amount in that direction.
* The search extends across document boundaries.
*
* @param aFrame the frame to start with
* @param aDirection Whether it's for horizontal or vertical scrolling.
* @return the nearest scrollable frame or nullptr if not found
*/
enum Direction { eHorizontal, eVertical };
static nsIScrollableFrame* GetNearestScrollableFrameForDirection(
nsIFrame* aFrame, Direction aDirection);
enum {
/**
* If the SCROLLABLE_SAME_DOC flag is set, then we only walk the frame tree
* up to the root frame in the current document.
*/
SCROLLABLE_SAME_DOC = 0x01,
/**
* If the SCROLLABLE_INCLUDE_HIDDEN flag is set then we allow
* overflow:hidden scrollframes to be returned as scrollable frames.
*/
SCROLLABLE_INCLUDE_HIDDEN = 0x02,
/**
* If the SCROLLABLE_ONLY_ASYNC_SCROLLABLE flag is set, then we only
* want to match scrollable frames for which WantAsyncScroll() returns
* true.
*/
SCROLLABLE_ONLY_ASYNC_SCROLLABLE = 0x04,
/**
* If the SCROLLABLE_ALWAYS_MATCH_ROOT flag is set, then we will always
* return the root scrollable frame for the root document (in the current
* process) if we encounter it, whether or not it is async scrollable or
* overflow: hidden.
*/
SCROLLABLE_ALWAYS_MATCH_ROOT = 0x08,
/**
* If the SCROLLABLE_FIXEDPOS_FINDS_ROOT flag is set, then for fixed-pos
* frames return the root scrollable frame for that document.
*/
SCROLLABLE_FIXEDPOS_FINDS_ROOT = 0x10,
/**
* If the SCROLLABLE_STOP_AT_PAGE flag is set, then we stop searching
* for scrollable ancestors when seeing a nsPageFrame. This can be used
* to avoid finding the viewport scroll frame in Print Preview (which
* would be undesirable as a 'position:sticky' container for content).
*/
SCROLLABLE_STOP_AT_PAGE = 0x20,
};
/**
* 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.
*/
static nsRect GetScrolledRect(nsIFrame* aScrolledFrame,
const nsRect& aScrolledFrameOverflowArea,
const nsSize& aScrollPortSize,
mozilla::StyleDirection);
/**
* HasPseudoStyle returns true if aContent (whose primary style
* context is aComputedStyle) has the aPseudoElement pseudo-style
* attached to it; returns false otherwise.
*
* @param aContent the content node we're looking at
* @param aComputedStyle aContent's ComputedStyle
* @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,
ComputedStyle* aComputedStyle,
mozilla::PseudoStyleType 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 StyleClear::Left, Right, Both.
static mozilla::StyleClear CombineBreakType(
mozilla::StyleClear aOrigBreakType, mozilla::StyleClear 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(
mozilla::dom::Event* 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, RelativeTo aFrame);
/**
* Get the coordinates of a given point relative to an event and a
* given frame.
* @param aEvent the event
* @param aPoint the point to get the coordinates relative to
* @param aFrame the frame to make coordinates relative to
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
* for some reason the coordinates for the mouse are not known (e.g.,
* the event is not a GUI event).
*/
static nsPoint GetEventCoordinatesRelativeTo(
const mozilla::WidgetEvent* aEvent,
const mozilla::LayoutDeviceIntPoint& aPoint, RelativeTo aFrame);
/**
* Get the coordinates of a given point relative to a widget and a
* given frame.
* @param aWidget the event src widget
* @param aPoint the point to get the coordinates relative to
* @param aFrame the frame to make coordinates relative to
* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
* for some reason the coordinates for the mouse are not known (e.g.,
* the event is not a GUI event).
*/
static nsPoint GetEventCoordinatesRelativeTo(
nsIWidget* aWidget, const mozilla::LayoutDeviceIntPoint& aPoint,
RelativeTo 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);
/**
* Get container and offset if aEvent collapses Selection.
* @param aPresShell The PresShell handling aEvent.
* @param aEvent The event having coordinates where you want to
* collapse Selection.
* @param aContainer Returns the container node at the point.
* Set nullptr if you don't need this.
* @param aOffset Returns offset in the container node at the point.
* Set nullptr if you don't need this.
*/
MOZ_CAN_RUN_SCRIPT
static void GetContainerAndOffsetAtEvent(PresShell* aPresShell,
const mozilla::WidgetEvent* aEvent,
nsIContent** aContainer,
int32_t* aOffset);
/**
* Translate from widget coordinates to the view's coordinates
* @param aPresContext the PresContext for the view
* @param aWidget the widget
* @param aPt the point relative to the widget
* @param aView view to which returned coordinates are relative
* @return the point in the view's coordinates
*/
static nsPoint TranslateWidgetToView(nsPresContext* aPresContext,
nsIWidget* aWidget,
const mozilla::LayoutDeviceIntPoint& aPt,
nsView* aView);
/**
* Translate from view coordinates to the widget's coordinates.
* @param aPresContext the PresContext for the view
* @param aView the view
* @param aPt the point relative to the view
* @param aViewportType whether the point is in visual or layout coordinates
* @param aWidget the widget to which returned coordinates are relative
* @return the point in the view's coordinates
*/
static mozilla::LayoutDeviceIntPoint TranslateViewToWidget(
nsPresContext* aPresContext, nsView* aView, nsPoint aPt,
ViewportType aViewportType, nsIWidget* aWidget);
static mozilla::LayoutDeviceIntPoint WidgetToWidgetOffset(
nsIWidget* aFromWidget, nsIWidget* aToWidget);
enum class FrameForPointOption {
/**
* When set, paint suppression is ignored, so we'll return non-root page
* elements even if paint suppression is stopping them from painting.
*/
IgnorePaintSuppression = 1,
/**
* When set, clipping due to the root scroll frame (and any other viewport-
* related clipping) is ignored.
*/
IgnoreRootScrollFrame,
/**
* When set, return only content in the same document as aFrame.
*/
IgnoreCrossDoc,
/**
* When set, return only content that is actually visible.
*/
OnlyVisible,
};
/**
* 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, in either visual
* or layout coordinates depending on aRelativeTo.mViewportType
* @param aFlags some combination of FrameForPointOption.
*/
static nsIFrame* GetFrameForPoint(RelativeTo aRelativeTo, nsPoint aPt,
mozilla::EnumSet<FrameForPointOption> = {});
/**
* 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, in either visual
* or layout coordinates depending on aRelativeTo.mViewportType
* @param aOutFrames an array to add all the frames found
* @param aFlags some combination of FrameForPointOption.
*/
static nsresult GetFramesForArea(RelativeTo aRelativeTo, const nsRect& aRect,
nsTArray<nsIFrame*>& aOutFrames,
mozilla::EnumSet<FrameForPointOption> = {});
/**
* 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().
* The corner positions of aRect are treated as meaningful even if aRect is
* empty.
*
* |aMatrixCache| allows for optimizations in recomputing the same matrix over
* and over. The argument can be one of the following values:
*
* nullptr (the default) - No optimization; the transform matrix is computed
* on every call to this function.
*
* non-null pointer to an empty Maybe<Matrix4x4> - Upon return, the Maybe is
* filled with the transform matrix that was computed. This can then be passed
* in to subsequent calls with the same source and destination frames to avoid
* recomputing the matrix.
*
* non-null pointer to a non-empty Matrix4x4 - The provided matrix will be
* used as the transform matrix and applied to the rect.
*/
static nsRect TransformFrameRectToAncestor(
const nsIFrame* aFrame, const nsRect& aRect, const nsIFrame* aAncestor,
bool* aPreservesAxisAlignedRectangles = nullptr,
mozilla::Maybe<Matrix4x4Flagged>* aMatrixCache = nullptr,
bool aStopAtStackingContextAndDisplayPortAndOOFFrame = false,
nsIFrame** aOutAncestor = nullptr) {
return TransformFrameRectToAncestor(
aFrame, aRect, RelativeTo{aAncestor}, aPreservesAxisAlignedRectangles,
aMatrixCache, aStopAtStackingContextAndDisplayPortAndOOFFrame,
aOutAncestor);
}
static nsRect TransformFrameRectToAncestor(
const nsIFrame* aFrame, const nsRect& aRect, RelativeTo aAncestor,
bool* aPreservesAxisAlignedRectangles = nullptr,
mozilla::Maybe<Matrix4x4Flagged>* aMatrixCache = nullptr,
bool aStopAtStackingContextAndDisplayPortAndOOFFrame = false,
nsIFrame** aOutAncestor = nullptr);
/**
* Gets the transform for aFrame relative to aAncestor. Pass null for
* aAncestor to go up to the root frame. Including nsIFrame::IN_CSS_UNITS
* flag in aFlags will return CSS pixels, by default it returns device
* pixels.
* More info can be found in nsIFrame::GetTransformMatrix.
*
* Some notes on the possible combinations of |aFrame.mViewportType| and
* |aAncestor.mViewportType|:
*
* | aFrame. | aAncestor. | Notes
* | mViewportType | mViewportType |
* ==========================================================================
* | Layout | Layout | Commonplace, when both source and target
* | | | are inside zoom boundary.
* | | |
* | | | Could also happen in non-e10s setups
* | | | when both source and target are outside
* | | | the zoom boundary and the code is
* | | | oblivious to the existence of a zoom
* | | | boundary.
* ==========================================================================
* | Layout | Visual | Commonplace, used when hit testing visual
* | | | coordinates (e.g. coming from user input
* | | | events). We expected to encounter a
* | | | zoomed content root during traversal and
* | | | apply a layout-to-visual transform.
* ==========================================================================
* | Visual | Layout | Should never happen, will assert.
* ==========================================================================
* | Visual | Visual | In e10s setups, should only happen if
* | | | aFrame and aAncestor are both the
* | | | RCD viewport frame.
* | | |
* | | | In non-e10s setups, could happen with
* | | | different frames if they are both
* | | | outside the zoom boundary.
* ==========================================================================
*/
static Matrix4x4Flagged GetTransformToAncestor(
RelativeTo aFrame, RelativeTo aAncestor, uint32_t aFlags = 0,
nsIFrame** aOutAncestor = nullptr);
/**
* Gets the scale factors of the transform for aFrame relative to the root
* frame if this transform is 2D, or the identity scale factors otherwise.
*/
static gfxSize GetTransformToAncestorScale(nsIFrame* aFrame);
/**
* Gets the scale factors of the transform for aFrame relative to the root
* frame if this transform is 2D, or the identity scale factors otherwise.
* If some frame on the path from aFrame to the display root frame may have an
* animated scale, returns the identity scale factors.
*/
static gfxSize GetTransformToAncestorScaleExcludingAnimated(nsIFrame* aFrame);
/**
* Find the nearest common ancestor frame for aFrame1 and aFrame2. The
* ancestor frame could be cross-doc.
*/
static const nsIFrame* FindNearestCommonAncestorFrame(
const nsIFrame* aFrame1, const nsIFrame* aFrame2);
/**
* Find the nearest common ancestor frame for aFrame1 and aFrame2, assuming
* that they are within the same block.
*
* Returns null if they are not within the same block.
*/
static const nsIFrame* FindNearestCommonAncestorFrameWithinBlock(
const nsTextFrame* aFrame1, const nsTextFrame* aFrame2);
/**
* Transforms a list of CSSPoints from aFromFrame to aToFrame, taking into
* account all relevant transformations on the frames up to (but excluding)
* their nearest common ancestor.
* If we encounter a transform that we need to invert but which is
* non-invertible, we return NONINVERTIBLE_TRANSFORM. If the frames have
* no common ancestor, we return NO_COMMON_ANCESTOR.
* If this returns TRANSFORM_SUCCEEDED, the points in aPoints are transformed
* in-place, otherwise they are untouched.
*/
enum TransformResult {
TRANSFORM_SUCCEEDED,
NO_COMMON_ANCESTOR,
NONINVERTIBLE_TRANSFORM
};
static TransformResult TransformPoints(nsIFrame* aFromFrame,
nsIFrame* aToFrame,
uint32_t aPointCount,
CSSPoint* aPoints);
/**
* Same as above function, but transform points in app units and
* handle 1 point per call.
*/
static TransformResult TransformPoint(RelativeTo aFromFrame,
RelativeTo 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(const nsIFrame* aFromFrame,
const nsIFrame* aToFrame, nsRect& aRect);
/**
* Converts app units to pixels (with optional snapping) and appends as a
* translation to aTransform.
*/
static void PostTranslate(Matrix4x4& aTransform, const nsPoint& aOrigin,
float aAppUnitsPerPixel, bool aRounded);
/*
* Whether the frame should snap to grid. This will end up being passed
* as the aRounded parameter in PostTranslate above. SVG frames should
* not have their translation rounded.
*/
static bool ShouldSnapToGrid(const nsIFrame* aFrame);
/**
* Get the border-box of aElement's primary frame, transformed it to be
* relative to aFrame.
*/
static nsRect GetRectRelativeToFrame(mozilla::dom::Element* aElement,
nsIFrame* aFrame);
/**
* Returns true if aRect with border inflation of size aInflateSize contains
* aPoint.
*/
static bool ContainsPoint(const nsRect& aRect, const nsPoint& aPoint,
nscoord aInflateSize);
/**
* Clamp aRect relative to aFrame to the scroll frames boundary searching from
* aFrame.
*/
static nsRect ClampRectToScrollFrames(nsIFrame* aFrame, const nsRect& aRect);
/**
* Return true if a "layer transform" could be computed for aFrame,
* and optionally return the computed transform. The returned
* transform is what would be set on the layer currently if a layers
* transaction were opened at the time this helper is called.
*/
static bool GetLayerTransformForFrame(nsIFrame* aFrame,
Matrix4x4Flagged* 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 aFromType Specifies whether |aPoint| is in layout or visual
* coordinates.
* @param aFrame The frame that acts as the coordinate space container.
* @param aPoint The point, in global layout or visual coordinates (as per
* |aFromType|, to get in the frame-local space.
* @return aPoint, expressed in aFrame's canonical coordinate space.
*/
static nsPoint TransformRootPointToFrame(ViewportType aFromType,
RelativeTo aFrame,
const nsPoint& aPoint) {
return TransformAncestorPointToFrame(aFrame, aPoint,
RelativeTo{nullptr, aFromType});
}
/**
* Transform aPoint relative to aAncestor down to the coordinate system of
* aFrame.
*/
static nsPoint TransformAncestorPointToFrame(RelativeTo aFrame,
const nsPoint& aPoint,
RelativeTo aAncestor);
/**
* Helper function that, given a rectangle and a matrix, returns the smallest
* rectangle containing the image of the source rectangle.
*
* @param aBounds The rectangle to transform.
* @param aMatrix The matrix to transform it with.
* @param aFactor The number of app units per graphics unit.
* @return The smallest rect that contains the image of aBounds.
*/
static nsRect MatrixTransformRect(const nsRect& aBounds,
const Matrix4x4& aMatrix, float aFactor);
static nsRect MatrixTransformRect(const nsRect& aBounds,
const Matrix4x4Flagged& aMatrix,
float aFactor);
/**
* Helper function that, given a point and a matrix, returns the image
* of that point under the matrix transform.
*
* @param aPoint The point to transform.
* @param aMatrix The matrix to transform it with.
* @param aFactor The number of app units per graphics unit.
* @return The image of the point under the transform.
*/
static nsPoint MatrixTransformPoint(const nsPoint& aPoint,
const Matrix4x4& aMatrix, float aFactor);
/**
* Given a graphics rectangle in graphics space, return a rectangle in
* app space that contains the graphics rectangle, rounding out as necessary.
*
* @param aRect The graphics rect to round outward.
* @param aFactor The number of app units per graphics unit.
* @return The smallest rectangle in app space that contains aRect.
*/
template <typename T>
static nsRect RoundGfxRectToAppRect(const T& aRect, const float aFactor);
/**
* Returns a subrectangle of aContainedRect that is entirely inside the
* rounded rect. Complex cases are handled conservatively by returning a
* smaller rect than necessary.
*/
static nsRegion RoundedRectIntersectRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aContainedRect);
static nsIntRegion RoundedRectIntersectIntRect(
const nsIntRect& aRoundedRect, const RectCornerRadii& aCornerRadii,
const nsIntRect& aContainedRect);
/**
* Return whether any part of aTestRect is inside of the rounded
* rectangle formed by aBounds and aRadii (which are indexed by the
* enum HalfCorner constants in gfx/2d/Types.h). This is precise.
*/
static bool RoundedRectIntersectsRect(const nsRect& aRoundedRect,
const nscoord aRadii[8],
const nsRect& aTestRect);
static bool MaybeCreateDisplayPortInFirstScrollFrameEncountered(
nsIFrame* aFrame, nsDisplayListBuilder* aBuilder);
enum class PaintFrameFlags : uint32_t {
InTransform = 0x01,
SyncDecodeImages = 0x02,
WidgetLayers = 0x04,
IgnoreSuppression = 0x08,
DocumentRelative = 0x10,
HideCaret = 0x20,
ToWindow = 0x40,
ExistingTransaction = 0x80,
NoComposite = 0x100,
Compressed = 0x200,
ForWebRender = 0x400,
UseHighQualityScaling = 0x800,
};
/**
* 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 aBuilderMode Passed through to the display-list builder.
* @param aFlags if PAINT_IN_TRANSFORM is set, then we assume
* this is inside a transform or SVG foreignObject. If
* PAINT_SYNC_DECODE_IMAGES is set, we force synchronous decode on all
* images. If PAINT_WIDGET_LAYERS is set, aFrame must be a display root,
* and we will use the frame's widget's layer manager to paint
* even if aRenderingContext is non-null. This is useful if you want
* to force rendering to use the widget's layer manager for testing
* or speed. PAINT_WIDGET_LAYERS must be set if aRenderingContext is null.
* If PAINT_DOCUMENT_RELATIVE is used, the visible region is interpreted
* as being relative to the document (normally it's relative to the CSS
* viewport) and the document is painted as if no scrolling has occured.
* Only considered if PresShell::IgnoringViewportScrolling is true.
* PAINT_TO_WINDOW sets painting to window to true on the display list
* builder even if we can't tell that we are painting to the window.
* If PAINT_EXISTING_TRANSACTION is set, then BeginTransaction() has already
* been called on aFrame's widget's layer manager and should not be
* called again.
* If PAINT_COMPRESSED is set, the FrameLayerBuilder should be set to
* compressed mode to avoid short cut optimizations.
*
* So there are three possible behaviours:
* 1) PAINT_WIDGET_LAYERS is set and aRenderingContext is null; we paint
* by calling BeginTransaction on the widget's layer manager.
* 2) PAINT_WIDGET_LAYERS is set and aRenderingContext is non-null; we
* paint by calling BeginTransactionWithTarget on the widget's layer
* manager.
* 3) PAINT_WIDGET_LAYERS is not set and aRenderingContext is non-null;
* we paint by construct a BasicLayerManager and calling
* BeginTransactionWithTarget on it. This is desirable if we're doing
* something like drawWindow in a mode where what gets rendered doesn't
* necessarily correspond to what's visible in the window; we don't
* want to mess up the widget's layer tree.
*/
static nsresult PaintFrame(gfxContext* aRenderingContext, nsIFrame* aFrame,
const nsRegion& aDirtyRegion, nscolor aBackstop,
nsDisplayListBuilderMode aBuilderMode,
PaintFrameFlags aFlags = PaintFrameFlags(0));
/**
* Uses a binary search for find where the cursor falls in the line of text
* It also keeps track of the part of the string that has already been
* measured so it doesn't have to keep measuring the same text over and over.
*
* @param "aBaseWidth" contains the width in twips of the portion
* of the text that has already been measured, and aBaseInx contains
* the index of the text that has already been measured.
*
* @param aTextWidth returns (in twips) the length of the text that falls
* before the cursor aIndex contains the index of the text where the cursor
* falls.
*/
static bool BinarySearchForPosition(DrawTarget* aDrawTarget,
nsFontMetrics& aFontMetrics,
const char16_t* aText, int32_t aBaseWidth,
int32_t aBaseInx, int32_t aStartInx,
int32_t aEndInx, int32_t aCursorPos,
int32_t& aIndex, int32_t& aTextWidth);
class BoxCallback {
public:
BoxCallback() : mIncludeCaptionBoxForTable(true) {}
virtual void AddBox(nsIFrame* aFrame) = 0;
bool mIncludeCaptionBoxForTable;
};
/**
* Collect all CSS boxes associated with aFrame and its
* continuations, "drilling down" through table wrapper 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);
/**
* Like GetAllInFlowBoxes, but doesn't include continuations.
*/
static void AddBoxesForFrame(nsIFrame* aFrame, BoxCallback* aCallback);
/**
* Find the first frame descendant of aFrame (including aFrame) which is
* not an anonymous frame that getBoxQuads/getClientRects should ignore.
*/
static nsIFrame* GetFirstNonAnonymousFrame(nsIFrame* aFrame);
class RectCallback {
public:
virtual void AddRect(const nsRect& aRect) = 0;
};
struct RectAccumulator : public RectCallback {
nsRect mResultRect;
nsRect mFirstRect;
bool mSeenFirstRect;
RectAccumulator();
virtual void AddRect(const nsRect& aRect) override;
};
struct RectListBuilder : public RectCallback {
DOMRectList* mRectList;
explicit RectListBuilder(DOMRectList* aList);
virtual void AddRect(const nsRect& aRect) override;
};
static nsIFrame* GetContainingBlockForClientRect(nsIFrame* aFrame);
enum {
RECTS_ACCOUNT_FOR_TRANSFORMS = 0x01,
// Two bits for specifying which box type to use.
// With neither bit set (default), use the border box.
RECTS_USE_CONTENT_BOX = 0x02,
RECTS_USE_PADDING_BOX = 0x04,
RECTS_USE_MARGIN_BOX = 0x06, // both bits set
RECTS_WHICH_BOX_MASK = 0x06 // bitmask for these two bits
};
/**
* Collect all CSS boxes (content, padding, border, or margin) associated
* with aFrame and its continuations, "drilling down" through table wrapper
* 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, const nsIFrame* aRelativeTo,
RectCallback* aCallback, uint32_t aFlags = 0);
static void GetAllInFlowRectsAndTexts(
nsIFrame* aFrame, const nsIFrame* aRelativeTo, RectCallback* aCallback,
mozilla::dom::Sequence<nsString>* aTextList, 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,
const nsIFrame* aRelativeTo,
uint32_t aFlags = 0);
enum { EXCLUDE_BLUR_SHADOWS = 0x01 };
/**
* Takes a text-shadow array from the style properties of a given nsIFrame and
* computes the union of those shadows along with the given initial rect.
* If there are no shadows, the initial rect is returned.
*/
static nsRect GetTextShadowRectsUnion(const nsRect& aTextAndDecorationsRect,
nsIFrame* aFrame, uint32_t aFlags = 0);
/**
* Computes the destination rect that a given replaced element should render
* into, based on its CSS 'object-fit' and 'object-position' properties.
*
* @param aConstraintRect The constraint rect that we have at our disposal,
* which would e.g. be exactly filled by the image
* if we had "object-fit: fill".
* @param aIntrinsicSize The replaced content's intrinsic size, as reported
* by nsIFrame::GetIntrinsicSize().
* @param aIntrinsicRatio The replaced content's intrinsic ratio, as reported
* by nsIFrame::GetIntrinsicRatio().
* @param aStylePos The nsStylePosition struct that contains the 'object-fit'
* and 'object-position' values that we should rely on.
* (This should usually be the nsStylePosition for the
* replaced element in question, but not always. For
* example, a <video>'s poster-image has a dedicated
* anonymous element & child-frame, but we should still use
* the <video>'s 'object-fit' and 'object-position' values.)
* @param aAnchorPoint [out] A point that should be pixel-aligned by functions
* like nsLayoutUtils::DrawImage. See documentation
* in nsCSSRendering.h for ComputeObjectAnchorPoint.
* @return The nsRect into which we should render the replaced content (using
* the same coordinate space as the passed-in aConstraintRect).
*/
static nsRect ComputeObjectDestRect(const nsRect& aConstraintRect,
const IntrinsicSize& aIntrinsicSize,
const AspectRatio& aIntrinsicRatio,
const nsStylePosition* aStylePos,
nsPoint* aAnchorPoint = nullptr);
/**
* Get the font metrics corresponding to the frame's style data.
* @param aFrame the frame
* @param aSizeInflation number to multiply font size by
*/
static already_AddRefed<nsFontMetrics> GetFontMetricsForFrame(
const nsIFrame* aFrame, float aSizeInflation);
static already_AddRefed<nsFontMetrics> GetInflatedFontMetricsForFrame(
const nsIFrame* aFrame) {
return GetFontMetricsForFrame(aFrame, FontSizeInflationFor(aFrame));
}
/**
* Get the font metrics corresponding to the given style data.
* @param aComputedStyle the style data
* @param aSizeInflation number to multiply font size by
*/
static already_AddRefed<nsFontMetrics> GetFontMetricsForComputedStyle(
ComputedStyle* aComputedStyle, nsPresContext* aPresContext,
float aSizeInflation = 1.0f,
uint8_t aVariantWidth = NS_FONT_VARIANT_WIDTH_NORMAL);
/**
* Get the font metrics of emphasis marks corresponding to the given
* style data. The result is same as GetFontMetricsForComputedStyle
* except that the font size is scaled down to 50%.
* @param aComputedStyle the style data
* @param aInflation number to multiple font size by
*/
static already_AddRefed<nsFontMetrics> GetFontMetricsOfEmphasisMarks(
ComputedStyle* aComputedStyle, nsPresContext* aPresContext,
float aInflation) {
return GetFontMetricsForComputedStyle(aComputedStyle, aPresContext,
aInflation * 0.5f);
}
/**
* Find the immediate child of aParent whose frame subtree contains
* aDescendantFrame. Returns null if aDescendantFrame is not a descendant
* of aParent.
*/
static nsIFrame* FindChildContainingDescendant(nsIFrame* aParent,
nsIFrame* aDescendantFrame);
/**
* Find the nearest ancestor that's a block
*/
static nsBlockFrame* FindNearestBlockAncestor(nsIFrame* aFrame);
/**
* Find the nearest ancestor that's not for generated content. Will return
* aFrame if aFrame is not for generated content.
*/
static nsIFrame* GetNonGeneratedAncestor(nsIFrame* aFrame);
/*
* 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(const 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);
/**
* Returns the frame that would act as the parent of aFrame when
* descending through the frame tree in display list building.
* Usually the same as GetParentOrPlaceholderForCrossDoc, except
* that pushed floats are treated as children of their containing
* block.
*/
static nsIFrame* GetDisplayListParent(nsIFrame* aFrame);
/**
* Get a frame's previous continuation, or, if it doesn't have one, its
* previous block-in-inline-split sibling.
*/
static nsIFrame* GetPrevContinuationOrIBSplitSibling(const nsIFrame* aFrame);
/**
* Get a frame's next continuation, or, if it doesn't have one, its
* block-in-inline-split sibling.
*/
static nsIFrame* GetNextContinuationOrIBSplitSibling(const nsIFrame* aFrame);
/**
* Get the first frame in the continuation-plus-ib-split-sibling chain
* containing aFrame.
*/
static nsIFrame* FirstContinuationOrIBSplitSibling(const nsIFrame* aFrame);
/**
* Get the last frame in the continuation-plus-ib-split-sibling chain
* containing aFrame.
*/
static nsIFrame* LastContinuationOrIBSplitSibling(const nsIFrame* aFrame);
/**
* Is FirstContinuationOrIBSplitSibling(aFrame) going to return
* aFrame?
*/
static bool IsFirstContinuationOrIBSplitSibling(const nsIFrame* aFrame);
/**
* Check whether aFrame is a part of the scrollbar or scrollcorner of
* the root content.
* @param aFrame the checking frame.
* @return true if the frame is a part of the scrollbar or scrollcorner of
* the root content.
*/
static bool IsViewportScrollbarFrame(nsIFrame* aFrame);
/**
* Get the contribution of aFrame to its containing block's intrinsic
* size for the given physical axis. This considers the child's intrinsic
* width, its 'width', 'min-width', and 'max-width' properties (or 'height'
* variations if that's what matches aAxis) and its padding, border and margin
* in the corresponding dimension.
* @param aPercentageBasis an optional percentage basis (in aFrame's WM).
* If the basis is indefinite in a given axis, pass a size with
* NS_UNCONSTRAINEDSIZE in that component.
* If you pass Nothing() a percentage basis will be calculated from aFrame's
* ancestors' computed size in the relevant axis, if needed.
* @param aMarginBoxMinSizeClamp make the result fit within this margin-box
* size by reducing the *content size* (flooring at zero). This is used for:
*/
enum class IntrinsicISizeType { MinISize, PrefISize };
static const auto MIN_ISIZE = IntrinsicISizeType::MinISize;
static const auto PREF_ISIZE = IntrinsicISizeType::PrefISize;
enum {
IGNORE_PADDING = 0x01,
BAIL_IF_REFLOW_NEEDED = 0x02, // returns NS_INTRINSIC_ISIZE_UNKNOWN if so
MIN_INTRINSIC_ISIZE = 0x04, // use min-width/height instead of width/height
};
static nscoord IntrinsicForAxis(
mozilla::PhysicalAxis aAxis, gfxContext* aRenderingContext,
nsIFrame* aFrame, IntrinsicISizeType aType,
const mozilla::Maybe<LogicalSize>& aPercentageBasis = mozilla::Nothing(),
uint32_t aFlags = 0, nscoord aMarginBoxMinSizeClamp = NS_MAXSIZE);
/**
* Calls IntrinsicForAxis with aFrame's parent's inline physical axis.
*/
static nscoord IntrinsicForContainer(gfxContext* aRenderingContext,
nsIFrame* aFrame,
IntrinsicISizeType aType,
uint32_t aFlags = 0);
/**
* Get the definite size contribution of aFrame for the given physical axis.
* This considers the child's 'min-width' property (or 'min-height' if the
* given axis is vertical), and its padding, border, and margin in the
* corresponding dimension. If the 'min-' property is 'auto' (and 'overflow'
* is 'visible') and the corresponding 'width'/'height' is definite it returns
* the "specified size" for:
* Note that the "transferred size" is not handled here; use IntrinsicForAxis.
* Note that any percentage in 'width'/'height' makes it count as indefinite.
* If the 'min-' property is 'auto' and 'overflow' is not 'visible', then it
* calculates the result as if the 'min-' computed value is zero.
* Otherwise, return NS_UNCONSTRAINEDSIZE.
*
* @param aPercentageBasis the percentage basis (in aFrame's WM).
* Pass NS_UNCONSTRAINEDSIZE if the basis is indefinite in either/both axes.
* @note this behavior is specific to Grid/Flexbox (currently) so aFrame
* should be a grid/flex item.
*/
static nscoord MinSizeContributionForAxis(mozilla::PhysicalAxis aAxis,
gfxContext* aRC, nsIFrame* aFrame,
IntrinsicISizeType aType,
const LogicalSize& aPercentageBasis,
uint32_t aFlags = 0);
/*
* Convert LengthPercentage 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 LengthPercentage& aCoord) {
NS_WARNING_ASSERTION(
aPercentBasis != NS_UNCONSTRAINEDSIZE,
"have unconstrained width or height; this should only result from very "
"large sizes, not attempts at intrinsic size calculation");
return aCoord.Resolve(aPercentBasis);
}
static nscoord ComputeCBDependentValue(nscoord aPercentBasis,
const LengthPercentageOrAuto& aCoord) {
if (aCoord.IsAuto()) {
return 0;
}
return ComputeCBDependentValue(aPercentBasis, aCoord.AsLengthPercentage());
}
static nscoord ComputeBSizeDependentValue(nscoord aContainingBlockBSize,
const LengthPercentageOrAuto&);
static nscoord ComputeBSizeValue(nscoord aContainingBlockBSize,
nscoord aContentEdgeToBoxSizingBoxEdge,
const LengthPercentage& aCoord) {
MOZ_ASSERT(aContainingBlockBSize != nscoord_MAX || !aCoord.HasPercent(),
"caller must deal with %% of unconstrained block-size");
nscoord result = aCoord.Resolve(aContainingBlockBSize);
// Clamp calc(), and the subtraction for box-sizing.
return std::max(0, result - aContentEdgeToBoxSizingBoxEdge);
}
/**
* The "extremum length" values (see ExtremumLength) were originally aimed at
* inline-size (or width, as it was before logicalization). For now, we return
* true for those here, so that we don't call ComputeBSizeValue with value
* types that it doesn't understand. (See bug 1113216.)
*
* FIXME (bug 567039, bug 527285)
* This isn't correct for the 'fill' value or for the 'min-*' or 'max-*'
* properties, which need to be handled differently by the callers of
* IsAutoBSize().
*/
template <typename SizeOrMaxSize>
static bool IsAutoBSize(const SizeOrMaxSize& aCoord, nscoord aCBBSize) {
return aCoord.BehavesLikeInitialValueOnBlockAxis() ||
(aCBBSize == nscoord_MAX && aCoord.HasPercent());
}
static bool IsPaddingZero(const LengthPercentage& aLength) {
// clamp negative calc() to 0
return aLength.Resolve(nscoord_MAX) <= 0 && aLength.Resolve(0) <= 0;
}
static bool IsMarginZero(const LengthPercentage& aLength) {
return aLength.Resolve(nscoord_MAX) == 0 && aLength.Resolve(0) == 0;
}
static void MarkDescendantsDirty(nsIFrame* aSubtreeRoot);
static void MarkIntrinsicISizesDirtyIfDependentOnBSize(nsIFrame* aFrame);
/*
* 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,
gfxContext* aRenderingContext);
// Implement nsIFrame::GetMinISize in terms of nsIFrame::AddInlineMinISize
static nscoord MinISizeFromInline(nsIFrame* aFrame,
gfxContext* aRenderingContext);
// Get a suitable foreground color for painting aColor for aFrame.
static nscolor DarkenColorIfNeeded(nsIFrame* aFrame, nscolor aColor);
// Get a suitable foreground color for painting aField for aFrame.
// Type of aFrame is made a template parameter because nsIFrame is not
// a complete type in the header. Type-safety is not harmed given that
// DarkenColorIfNeeded requires an nsIFrame pointer.
template <typename Frame, typename T, typename S>
static nscolor GetColor(Frame* aFrame, T S::*aField) {
nscolor color = aFrame->GetVisitedDependentColor(aField);
return DarkenColorIfNeeded(aFrame, color);
}
// Get a baseline y position in app units that is snapped to device pixels.
static gfxFloat GetSnappedBaselineY(nsIFrame* aFrame, gfxContext* aContext,
nscoord aY, nscoord aAscent);
// Ditto for an x position (for vertical text). Note that for vertical-rl
// writing mode, the ascent value should be negated by the caller.
static gfxFloat GetSnappedBaselineX(nsIFrame* aFrame, gfxContext* aContext,
nscoord aX, nscoord aAscent);
static nscoord AppUnitWidthOfString(char16_t aC, nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget) {
return AppUnitWidthOfString(&aC, 1, aFontMetrics, aDrawTarget);
}
static nscoord AppUnitWidthOfString(const nsString& aString,
nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget) {
return nsLayoutUtils::AppUnitWidthOfString(aString.get(), aString.Length(),
aFontMetrics, aDrawTarget);
}
static nscoord AppUnitWidthOfString(const char16_t* aString, uint32_t aLength,
nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget);
static nscoord AppUnitWidthOfStringBidi(const nsString& aString,
const nsIFrame* aFrame,
nsFontMetrics& aFontMetrics,
gfxContext& aContext) {
return nsLayoutUtils::AppUnitWidthOfStringBidi(
aString.get(), aString.Length(), aFrame, aFontMetrics, aContext);
}
static nscoord AppUnitWidthOfStringBidi(const char16_t* aString,
uint32_t aLength,
const nsIFrame* aFrame,
nsFontMetrics& aFontMetrics,
gfxContext& aContext);
static bool StringWidthIsGreaterThan(const nsString& aString,
nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget, nscoord aWidth);
static nsBoundingMetrics AppUnitBoundsOfString(const char16_t* aString,
uint32_t aLength,
nsFontMetrics& aFontMetrics,
DrawTarget* aDrawTarget);
static void DrawString(const nsIFrame* aFrame, nsFontMetrics& aFontMetrics,
gfxContext* aContext, const char16_t* aString,
int32_t aLength, nsPoint aPoint,
ComputedStyle* aComputedStyle = nullptr,
DrawStringFlags aFlags = DrawStringFlags::Default);
static nsPoint GetBackgroundFirstTilePos(const nsPoint& aDest,
const nsPoint& aFill,
const nsSize& aRepeatSize);
/**
* Supports only LTR or RTL. Bidi (mixed direction) is not supported.
*/
static void DrawUniDirString(const char16_t* aString, uint32_t aLength,
const nsPoint& aPoint,
nsFontMetrics& aFontMetrics,
gfxContext& aContext);
/**
* Helper function for drawing text-shadow. The callback's job
* is to draw whatever needs to be blurred onto the given context.
*/
typedef void (*TextShadowCallback)(gfxContext* aCtx, nsPoint aShadowOffset,
const nscolor& aShadowColor, void* aData);
static void PaintTextShadow(const nsIFrame* aFrame, gfxContext* aContext,
const nsRect& aTextRect, const nsRect& aDirtyRect,
const nscolor& aForegroundColor,
TextShadowCallback aCallback,
void* aCallbackData);
/**
* Gets the baseline to vertically center text from a font within a
* line of specified height.
* aIsInverted: true if the text is inverted relative to the block
* direction, so that the block-dir "ascent" corresponds to font
* descent. (Applies to sideways text in vertical-lr mode.)
*
* Returns the baseline position relative to the top of the line.
*/
static nscoord GetCenteredFontBaseline(nsFontMetrics* aFontMetrics,
nscoord aLineHeight, bool aIsInverted);
/**
* Derive a baseline of |aFrame| (measured from its top border edge)
* from its first in-flow line box (not descending into anything with
* 'overflow' not 'visible', potentially including aFrame itself).
*
* Returns true if a baseline was found (and fills in aResult).
* Otherwise returns false.
*/
static bool GetFirstLineBaseline(mozilla::WritingMode aWritingMode,
const nsIFrame* aFrame, nscoord* aResult);
/**
* Just like GetFirstLineBaseline, except also returns the top and
* bottom of the line with the baseline.
*
* Returns true if a line was found (and fills in aResult).
* Otherwise returns false.
*/
struct LinePosition {
nscoord mBStart, mBaseline, mBEnd;
LinePosition operator+(nscoord aOffset) const {
LinePosition result;
result.mBStart = mBStart + aOffset;
result.mBaseline = mBaseline + aOffset;
result.mBEnd = mBEnd + aOffset;
return result;
}
};
static bool GetFirstLinePosition(mozilla::WritingMode aWritingMode,
const nsIFrame* aFrame,
LinePosition* aResult);
/**
* Derive a baseline of |aFrame| (measured from its top border edge)
* from its last in-flow line box (not descending into anything with
* 'overflow' not 'visible', potentially including aFrame itself).
*
* Returns true if a baseline was found (and fills in aResult).
* Otherwise returns false.
*/
static bool GetLastLineBaseline(mozilla::WritingMode aWritingMode,
const nsIFrame* aFrame, nscoord* aResult);
/**
* Returns a block-dir coordinate relative to this frame's origin that
* represents the logical block-end of the frame or its visible content,
* whichever is further from the origin.
* Relative positioning is ignored and margins and glyph bounds are not
* considered.
* This value will be >= mRect.BSize() and <= overflowRect.BEnd() unless
* relative positioning is applied.
*/
static nscoord CalculateContentBEnd(mozilla::WritingMode aWritingMode,
nsIFrame* aFrame);
/**
* Gets the closest frame (the frame passed in or one of its parents) that
* qualifies as a "layer"; used in DOM0 methods that depends upon that
* definition. This is the nearest frame that is either positioned or scrolled
* (the child of a scroll frame).
*/
static nsIFrame* GetClosestLayer(nsIFrame* aFrame);
/**
* Gets the graphics sampling filter for the frame
*/
static SamplingFilter GetSamplingFilterForFrame(nsIFrame* aFrame);
static inline void InitDashPattern(StrokeOptions& aStrokeOptions,
mozilla::StyleBorderStyle aBorderStyle) {
if (aBorderStyle == mozilla::StyleBorderStyle::Dotted) {
static Float dot[] = {1.f, 1.f};
aStrokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dot);
aStrokeOptions.mDashPattern = dot;
} else if (aBorderStyle == mozilla::StyleBorderStyle::Dashed) {
static Float dash[] = {5.f, 5.f};
aStrokeOptions.mDashLength = MOZ_ARRAY_LENGTH(dash);
aStrokeOptions.mDashPattern = dash;
} else {
aStrokeOptions.mDashLength = 0;
aStrokeOptions.mDashPattern = nullptr;
}
}
/**
* Convert an nsRect to a gfxRect.
*/
static gfxRect RectToGfxRect(const nsRect& aRect,
int32_t aAppUnitsPerDevPixel);
static gfxPoint PointToGfxPoint(const nsPoint& aPoint,
int32_t aAppUnitsPerPixel) {
return gfxPoint(gfxFloat(aPoint.x) / aAppUnitsPerPixel,
gfxFloat(aPoint.y) / aAppUnitsPerPixel);
}
/* 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.
*
* @param aContext
* The context to draw to, already set up with an appropriate scale and
* transform for drawing in app units.
* @param aForFrame
* The nsIFrame that we're drawing this image for.
* @param aImage
* The image.
* @param aDest
* The position and scaled area where one copy of the image should be drawn.
* This area represents the image itself in its correct position as defined
* with the background-position css property.
* @param aFill
* The area to be filled with copies of the image.
* @param aRepeatSize
* The distance between the positions of two subsequent repeats of the image.
* Sizes larger than aDest.Size() create gaps between the images.
* @param aAnchor
* A point in aFill which we will ensure is pixel-aligned in the output.
* @param aDirty
* Pixels outside this area may be skipped.
* @param aImageFlags
* Image flags of the imgIContainer::FLAG_* variety.
* @param aExtendMode
* How to extend the image over the dest rect.
*/
static ImgDrawResult DrawBackgroundImage(
gfxContext& aContext, nsIFrame* aForFrame, nsPresContext* aPresContext,
imgIContainer* aImage, SamplingFilter aSamplingFilter,
const nsRect& aDest, const nsRect& aFill, const nsSize& aRepeatSize,
const nsPoint& aAnchor, const nsRect& aDirty, uint32_t aImageFlags,
ExtendMode aExtendMode, float aOpacity);
/**
* Draw an image.
* @param aRenderingContext Where to draw the image, set up with an
* appropriate scale and transform for drawing in
* app units.
* @param aComputedStyle The ComputedStyle of the nsIFrame (or
* pseudo-element) for which this image is being
* drawn.
* @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 ImgDrawResult DrawImage(gfxContext& aContext,
ComputedStyle* aComputedStyle,
nsPresContext* aPresContext,
imgIContainer* aImage,
const SamplingFilter aSamplingFilter,
const nsRect& aDest, const nsRect& aFill,
const nsPoint& aAnchor, const nsRect& aDirty,
uint32_t aImageFlags, float aOpacity = 1.0);
/**
* 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 aSVGContext Optionally provides an SVGImageContext.
* Callers should pass an SVGImageContext with at
* least the viewport size set if aImage may be of
* type imgIContainer::TYPE_VECTOR, or pass
* Nothing() if it is of type
* imgIContainer::TYPE_RASTER (to save cycles
* constructing an SVGImageContext, since this
* argument will be 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 at aDest. It's
* in appunits. For best results it should
* be aligned with image pixels.
*/
static ImgDrawResult DrawSingleUnscaledImage(
gfxContext& aContext, nsPresContext* aPresContext, imgIContainer* aImage,
const SamplingFilter aSamplingFilter, const nsPoint& aDest,
const nsRect* aDirty, const mozilla::Maybe<SVGImageContext>& aSVGContext,
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 Optionally provides an SVGImageContext.
* Callers should pass an SVGImageContext with at
* least the viewport size set if aImage may be of
* type imgIContainer::TYPE_VECTOR, or pass
* Nothing() if it is of type
* imgIContainer::TYPE_RASTER (to save cycles
* constructing an SVGImageContext, since this
* argument will be ignored for raster images).
* @param aImageFlags Image flags of the imgIContainer::FLAG_*
* variety.
* @param aAnchor If non-null, a point which we will ensure
* is pixel-aligned in the output.
* @param aSourceArea If non-null, this area is extracted from
* the image and drawn in aDest. It's
* in appunits. For best results it should
* be aligned with image pixels.
*/
static ImgDrawResult DrawSingleImage(
gfxContext& aContext, nsPresContext* aPresContext, imgIContainer* aImage,
const SamplingFilter aSamplingFilter, const nsRect& aDest,
const nsRect& aDirty, const mozilla::Maybe<SVGImageContext>& aSVGContext,
uint32_t aImageFlags, const nsPoint* aAnchorPoint = nullptr,
const nsRect* aSourceArea = nullptr);
/**
* Given an imgIContainer, this method attempts to obtain an intrinsic
* px-valued height & width for it. If the imgIContainer has a non-pixel
* value for either height or width, this method tries to generate a pixel
* value for that dimension using the intrinsic ratio (if available). The
* intrinsic ratio will be assigned to aIntrinsicRatio; if there's no
* intrinsic ratio then (0, 0) will be assigned.
*
* This method will always set aGotWidth and aGotHeight to indicate whether
* we were able to successfully obtain (or compute) a value for each
* dimension.
*
* NOTE: This method is similar to ComputeSizeWithIntrinsicDimensions. The
* difference is that this one is simpler and is suited to places where we
* have less information about the frame tree.
*/
static