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10960cad13
When an animation targets a CSS property that could cause a containing block to be generated for its descendants, this containing block must be generated even if the particular property values used by the animation would not normally trigger generation of a containing block (e.g. transform: none). This is due to the implicit application of will-change defined in CSS Animations[1] and Web Animations[2]. Since this containing block is generated at the start of the animations, we can throttle animations that produce the UpdateContainingBlock change hint for animations that are not visible since they shouldn't have any further side effects beyond the generation of containing blocks (which have already happened). [1] https://drafts.csswg.org/css-animations/#animations [2] https://drafts.csswg.org/web-animations-1/#side-effects-section Unfortunately perspective animations starting with 'none' and transform animations from 'none' to 'none' don't create a containing block (bug 1470349 and bug 1470370). That doesn't block the optimization in this patch, however, since those bugs occur regardless of element visibility. MozReview-Commit-ID: 8rTl8dShHrD --HG-- extra : rebase_source : 886b003d0f3c555a12baf0de81b4130ef2d71e82
668 lines
27 KiB
C
668 lines
27 KiB
C
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* constants for what needs to be recomputed in response to style changes */
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#ifndef nsChangeHint_h___
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#define nsChangeHint_h___
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#include "mozilla/Types.h"
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#include "nsDebug.h"
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#include "nsTArray.h"
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// Defines for various style related constants
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enum nsChangeHint : uint32_t {
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nsChangeHint_Empty = 0,
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// change was visual only (e.g., COLOR=)
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// Invalidates all descendant frames (including following
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// placeholders to out-of-flow frames).
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nsChangeHint_RepaintFrame = 1 << 0,
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// For reflow, we want flags to give us arbitrary FrameNeedsReflow behavior.
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// just do a FrameNeedsReflow.
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nsChangeHint_NeedReflow = 1 << 1,
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// Invalidate intrinsic widths on the frame's ancestors. Must not be set
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// without setting nsChangeHint_NeedReflow.
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nsChangeHint_ClearAncestorIntrinsics = 1 << 2,
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// Invalidate intrinsic widths on the frame's descendants. Must not be set
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// without also setting nsChangeHint_ClearAncestorIntrinsics,
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// nsChangeHint_NeedDirtyReflow and nsChangeHint_NeedReflow.
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nsChangeHint_ClearDescendantIntrinsics = 1 << 3,
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// Force unconditional reflow of all descendants. Must not be set without
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// setting nsChangeHint_NeedReflow, but can be set regardless of whether the
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// Clear*Intrinsics flags are set.
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nsChangeHint_NeedDirtyReflow = 1 << 4,
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// change requires view to be updated, if there is one (e.g., clip:).
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// Updates all descendants (including following placeholders to out-of-flows).
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nsChangeHint_SyncFrameView = 1 << 5,
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// The currently shown mouse cursor needs to be updated
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nsChangeHint_UpdateCursor = 1 << 6,
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/**
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* Used when the computed value (a URI) of one or more of an element's
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* filter/mask/clip/etc CSS properties changes, causing the element's frame
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* to start/stop referencing (or reference different) SVG resource elements.
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* (_Not_ used to handle changes to referenced resource elements.) Using this
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* hint results in SVGObserverUtils::UpdateEffects being called on the
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* element's frame.
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*/
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nsChangeHint_UpdateEffects = 1 << 7,
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/**
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* Visual change only, but the change can be handled entirely by
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* updating the layer(s) for the frame.
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* Updates all descendants (including following placeholders to out-of-flows).
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*/
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nsChangeHint_UpdateOpacityLayer = 1 << 8,
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/**
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* Updates all descendants. Any placeholder descendants' out-of-flows
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* are also descendants of the transformed frame, so they're updated.
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*/
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nsChangeHint_UpdateTransformLayer = 1 << 9,
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/**
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* Change requires frame change (e.g., display:).
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* Reconstructs all frame descendants, including following placeholders
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* to out-of-flows.
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*
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* Note that this subsumes all the other change hints. (see
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* RestyleManager::ProcessRestyledFrames for details).
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*/
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nsChangeHint_ReconstructFrame = 1 << 10,
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/**
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* The frame's overflow area has changed. Does not update any descendant
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* frames.
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*/
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nsChangeHint_UpdateOverflow = 1 << 11,
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/**
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* The overflow area of the frame and all of its descendants has changed. This
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* can happen through a text-decoration change.
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*/
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nsChangeHint_UpdateSubtreeOverflow = 1 << 12,
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/**
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* The frame's overflow area has changed, through a change in its transform.
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* In other words, the frame's pre-transform overflow is unchanged, but
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* its post-transform overflow has changed, and thus its effect on its
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* parent's overflow has changed. If the pre-transform overflow has
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* changed, see nsChangeHint_UpdateOverflow.
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* Does not update any descendant frames.
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*/
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nsChangeHint_UpdatePostTransformOverflow = 1 << 13,
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/**
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* This frame's effect on its parent's overflow area has changed.
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* (But neither its pre-transform nor post-transform overflow have
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* changed; if those are the case, see
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* nsChangeHint_UpdatePostTransformOverflow.)
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*/
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nsChangeHint_UpdateParentOverflow = 1 << 14,
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/**
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* The children-only transform of an SVG frame changed, requiring the
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* overflow rects of the frame's immediate children to be updated.
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*/
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nsChangeHint_ChildrenOnlyTransform = 1 << 15,
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/**
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* The frame's offsets have changed, while its dimensions might have
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* changed as well. This hint is used for positioned frames if their
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* offset changes. If we decide that the dimensions are likely to
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* change, this will trigger a reflow.
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*
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* Note that this should probably be used in combination with
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* nsChangeHint_UpdateOverflow in order to get the overflow areas of
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* the ancestors updated as well.
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*/
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nsChangeHint_RecomputePosition = 1 << 16,
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/**
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* Behaves like ReconstructFrame, but only if the frame has descendants
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* that are absolutely or fixed position. Use this hint when a style change
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* has changed whether the frame is a container for fixed-pos or abs-pos
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* elements, but reframing is otherwise not needed.
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*
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* Note that ComputedStyle::CalcStyleDifference adjusts results
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* returned by style struct CalcDifference methods to return this hint
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* only if there was a change to whether the element's overall style
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* indicates that it establishes a containing block.
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*/
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nsChangeHint_UpdateContainingBlock = 1 << 17,
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/**
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* This change hint has *no* change handling behavior. However, it
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* exists to be a non-inherited hint, because when the border-style
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* changes, and it's inherited by a child, that might require a reflow
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* due to the border-width change on the child.
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*/
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nsChangeHint_BorderStyleNoneChange = 1 << 18,
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/**
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* SVG textPath needs to be recomputed because the path has changed.
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* This means that the glyph positions of the text need to be recomputed.
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*/
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nsChangeHint_UpdateTextPath = 1 << 19,
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/**
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* This will schedule an invalidating paint. This is useful if something
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* has changed which will be invalidated by DLBI.
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*/
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nsChangeHint_SchedulePaint = 1 << 20,
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/**
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* A hint reflecting that style data changed with no change handling
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* behavior. We need to return this, rather than nsChangeHint(0),
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* so that certain optimizations that manipulate the style tree are
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* correct.
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*
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* nsChangeHint_NeutralChange must be returned by CalcDifference on a given
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* style struct if the data in the style structs are meaningfully different
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* and if no other change hints are returned. If any other change hints are
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* set, then nsChangeHint_NeutralChange need not also be included, but it is
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* safe to do so. (An example of style structs having non-meaningfully
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* different data would be cached information that would be re-calculated
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* to the same values, such as nsStyleBorder::mSubImages.)
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*/
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nsChangeHint_NeutralChange = 1 << 21,
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/**
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* This will cause rendering observers to be invalidated.
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*/
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nsChangeHint_InvalidateRenderingObservers = 1 << 22,
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/**
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* Indicates that the reflow changes the size or position of the
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* element, and thus the reflow must start from at least the frame's
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* parent. Must be not be set without also setting nsChangeHint_NeedReflow
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* and nsChangeHint_ClearAncestorIntrinsics.
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*/
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nsChangeHint_ReflowChangesSizeOrPosition = 1 << 23,
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/**
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* Indicates that the style changes the computed BSize --- e.g. 'height'.
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* Must not be set without also setting nsChangeHint_NeedReflow.
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*/
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nsChangeHint_UpdateComputedBSize = 1 << 24,
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/**
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* Indicates that the 'opacity' property changed between 1 and non-1.
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*
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* Used as extra data for handling UpdateOpacityLayer hints.
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*
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* Note that we do not send this hint if the non-1 value was 0.99 or
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* greater, since in that case we send a RepaintFrame hint instead.
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*/
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nsChangeHint_UpdateUsesOpacity = 1 << 25,
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/**
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* Indicates that the 'background-position' property changed.
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* Regular frames can invalidate these changes using DLBI, but
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* for some frame types we need to repaint the whole frame because
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* the frame does not build individual background image display items
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* for each background layer.
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*/
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nsChangeHint_UpdateBackgroundPosition = 1 << 26,
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/**
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* Indicates that a frame has changed to or from having the CSS
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* transform property set.
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*/
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nsChangeHint_AddOrRemoveTransform = 1 << 27,
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/**
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* Indicates that the overflow-x and/or overflow-y property changed.
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*
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* In most cases, this is equivalent to nsChangeHint_ReconstructFrame. But
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* in some special cases where the change is really targeting the viewport's
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* scrollframe, this is instead equivalent to nsChangeHint_AllReflowHints
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* (because the viewport always has an associated scrollframe).
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*/
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nsChangeHint_CSSOverflowChange = 1 << 28,
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/**
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* Indicates that nsIFrame::UpdateWidgetProperties needs to be called.
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* This is used for -moz-window-* properties.
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*/
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nsChangeHint_UpdateWidgetProperties = 1 << 29,
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/**
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* Indicates that there has been a colspan or rowspan attribute change
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* on the cells of a table.
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*/
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nsChangeHint_UpdateTableCellSpans = 1 << 30,
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/**
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* Indicates that the visiblity property changed.
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* This change hint is used for skip restyling for animations on
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* visibility:hidden elements in the case where the elements have no visible
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* descendants.
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*/
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nsChangeHint_VisibilityChange = 1u << 31,
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// IMPORTANT NOTE: When adding a new hint, you will need to add it to
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// one of:
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//
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// * nsChangeHint_Hints_NeverHandledForDescendants
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// * nsChangeHint_Hints_AlwaysHandledForDescendants
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// * nsChangeHint_Hints_SometimesHandledForDescendants
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//
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// and you also may need to handle it in NS_HintsNotHandledForDescendantsIn.
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//
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// Please also add it to RestyleManager::ChangeHintToString and
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// modify nsChangeHint_AllHints below accordingly.
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/**
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* Dummy hint value for all hints. It exists for compile time check.
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*/
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nsChangeHint_AllHints = uint32_t((1ull << 32) - 1),
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};
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// Redefine these operators to return nothing. This will catch any use
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// of these operators on hints. We should not be using these operators
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// on nsChangeHints
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inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
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// Operators on nsChangeHints
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// Returns true iff the second hint contains all the hints of the first hint
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inline bool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
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return (aSubset & aSuperSet) == aSubset;
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}
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// The functions below need an integral type to cast to to avoid
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// infinite recursion.
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typedef decltype(nsChangeHint(0) + nsChangeHint(0)) nsChangeHint_size_t;
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inline nsChangeHint constexpr
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operator|(nsChangeHint aLeft, nsChangeHint aRight)
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{
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return nsChangeHint(nsChangeHint_size_t(aLeft) | nsChangeHint_size_t(aRight));
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}
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inline nsChangeHint constexpr
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operator&(nsChangeHint aLeft, nsChangeHint aRight)
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{
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return nsChangeHint(nsChangeHint_size_t(aLeft) & nsChangeHint_size_t(aRight));
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}
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inline nsChangeHint& operator|=(nsChangeHint& aLeft, nsChangeHint aRight)
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{
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return aLeft = aLeft | aRight;
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}
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inline nsChangeHint& operator&=(nsChangeHint& aLeft, nsChangeHint aRight)
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{
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return aLeft = aLeft & aRight;
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}
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inline nsChangeHint constexpr
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operator~(nsChangeHint aArg)
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{
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return nsChangeHint(~nsChangeHint_size_t(aArg));
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}
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inline nsChangeHint constexpr
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operator^(nsChangeHint aLeft, nsChangeHint aRight)
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{
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return nsChangeHint(nsChangeHint_size_t(aLeft) ^ nsChangeHint_size_t(aRight));
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}
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inline nsChangeHint operator^=(nsChangeHint& aLeft, nsChangeHint aRight)
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{
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return aLeft = aLeft ^ aRight;
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}
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/**
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* We have an optimization when processing change hints which prevents
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* us from visiting the descendants of a node when a hint on that node
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* is being processed. This optimization does not apply in some of the
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* cases where applying a hint to an element does not necessarily result
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* in the same hint being handled on the descendants.
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*/
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// The change hints that are always handled for descendants.
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#define nsChangeHint_Hints_AlwaysHandledForDescendants ( \
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nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow | \
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nsChangeHint_NeutralChange | \
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nsChangeHint_ReconstructFrame | \
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nsChangeHint_RepaintFrame | \
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nsChangeHint_SchedulePaint | \
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nsChangeHint_SyncFrameView | \
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nsChangeHint_UpdateCursor | \
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nsChangeHint_UpdateSubtreeOverflow | \
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nsChangeHint_UpdateTextPath | \
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nsChangeHint_VisibilityChange \
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)
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// The change hints that are never handled for descendants.
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#define nsChangeHint_Hints_NeverHandledForDescendants ( \
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nsChangeHint_BorderStyleNoneChange | \
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nsChangeHint_ChildrenOnlyTransform | \
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nsChangeHint_CSSOverflowChange | \
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nsChangeHint_InvalidateRenderingObservers | \
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nsChangeHint_RecomputePosition | \
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nsChangeHint_UpdateBackgroundPosition | \
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nsChangeHint_UpdateComputedBSize | \
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nsChangeHint_UpdateContainingBlock | \
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nsChangeHint_UpdateEffects | \
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nsChangeHint_UpdateOpacityLayer | \
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nsChangeHint_UpdateOverflow | \
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nsChangeHint_UpdateParentOverflow | \
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nsChangeHint_UpdatePostTransformOverflow | \
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nsChangeHint_UpdateTableCellSpans | \
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nsChangeHint_UpdateTransformLayer | \
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nsChangeHint_UpdateUsesOpacity | \
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nsChangeHint_AddOrRemoveTransform | \
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nsChangeHint_UpdateWidgetProperties \
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)
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// The change hints that are sometimes considered to be handled for descendants.
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#define nsChangeHint_Hints_SometimesHandledForDescendants (\
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nsChangeHint_ClearAncestorIntrinsics | \
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nsChangeHint_NeedReflow | \
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nsChangeHint_ReflowChangesSizeOrPosition \
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)
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static_assert(!(nsChangeHint_Hints_AlwaysHandledForDescendants &
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nsChangeHint_Hints_NeverHandledForDescendants) &&
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!(nsChangeHint_Hints_AlwaysHandledForDescendants &
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nsChangeHint_Hints_SometimesHandledForDescendants) &&
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!(nsChangeHint_Hints_NeverHandledForDescendants &
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nsChangeHint_Hints_SometimesHandledForDescendants) &&
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!(nsChangeHint_AllHints ^
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nsChangeHint_Hints_AlwaysHandledForDescendants ^
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nsChangeHint_Hints_NeverHandledForDescendants ^
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nsChangeHint_Hints_SometimesHandledForDescendants),
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"change hints must be present in exactly one of "
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"nsChangeHint_Hints_{Always,Never,Sometimes}"
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"HandledForDescendants");
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// The most hints that NS_HintsNotHandledForDescendantsIn could possibly return:
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#define nsChangeHint_Hints_NotHandledForDescendants ( \
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nsChangeHint_Hints_NeverHandledForDescendants | \
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nsChangeHint_Hints_SometimesHandledForDescendants \
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)
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// Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
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#define NS_STYLE_HINT_VISUAL \
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nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView | \
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nsChangeHint_SchedulePaint)
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#define nsChangeHint_AllReflowHints \
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nsChangeHint(nsChangeHint_NeedReflow | \
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nsChangeHint_ReflowChangesSizeOrPosition|\
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nsChangeHint_ClearAncestorIntrinsics | \
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nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow)
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// Below are the change hints that we send for ISize & BSize changes.
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// Each is similar to nsChangeHint_AllReflowHints with a few changes.
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// * For an ISize change, we send nsChangeHint_AllReflowHints, with two bits
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// excluded: nsChangeHint_ClearDescendantIntrinsics (because an ancestor's
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// inline-size change can't affect descendant intrinsic sizes), and
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// nsChangeHint_NeedDirtyReflow (because ISize changes don't need to *force*
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// all descendants to reflow).
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#define nsChangeHint_ReflowHintsForISizeChange \
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nsChangeHint(nsChangeHint_AllReflowHints & \
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~(nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow))
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// * For a BSize change, we send almost the same hints as for ISize changes,
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// with one extra: nsChangeHint_UpdateComputedBSize. We need this hint because
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// BSize changes CAN affect descendant intrinsic sizes, due to replaced
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// elements with percentage BSizes in descendants which also have percentage
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// BSizes. nsChangeHint_UpdateComputedBSize clears intrinsic sizes for frames
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// that have such replaced elements. (We could instead send
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// nsChangeHint_ClearDescendantIntrinsics, but that's broader than we need.)
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//
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// NOTE: You might think that BSize changes could exclude
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// nsChangeHint_ClearAncestorIntrinsics (which is inline-axis specific), but we
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// do need to send it, to clear cached results from CSS Flex measuring reflows.
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#define nsChangeHint_ReflowHintsForBSizeChange \
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nsChangeHint((nsChangeHint_AllReflowHints | \
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nsChangeHint_UpdateComputedBSize) & \
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~(nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow))
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// * For changes to the float area of an already-floated element, we need all
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// reflow hints, but not the ones that apply to descendants.
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// Our descendants aren't impacted when our float area only changes
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// placement but not size/shape. (e.g. if we change which side we float to).
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// But our ancestors/siblings are potentially impacted, so we need to send
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// the non-descendant reflow hints.
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#define nsChangeHint_ReflowHintsForFloatAreaChange \
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nsChangeHint(nsChangeHint_AllReflowHints & \
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~(nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow))
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#define NS_STYLE_HINT_REFLOW \
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nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_AllReflowHints)
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#define nsChangeHint_Hints_CanIgnoreIfNotVisible \
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nsChangeHint(NS_STYLE_HINT_VISUAL | \
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nsChangeHint_NeutralChange | \
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nsChangeHint_UpdateOpacityLayer | \
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nsChangeHint_AddOrRemoveTransform | \
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nsChangeHint_UpdateContainingBlock | \
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nsChangeHint_UpdateOverflow | \
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nsChangeHint_UpdatePostTransformOverflow | \
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nsChangeHint_UpdateTransformLayer | \
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nsChangeHint_UpdateUsesOpacity | \
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nsChangeHint_VisibilityChange)
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// NB: Once we drop support for the old style system, this logic should be
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// inlined in the Servo style system to eliminate the FFI call.
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inline nsChangeHint NS_HintsNotHandledForDescendantsIn(nsChangeHint aChangeHint) {
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nsChangeHint result =
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aChangeHint & nsChangeHint_Hints_NeverHandledForDescendants;
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if (!NS_IsHintSubset(nsChangeHint_NeedDirtyReflow, aChangeHint)) {
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if (NS_IsHintSubset(nsChangeHint_NeedReflow, aChangeHint)) {
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// If NeedDirtyReflow is *not* set, then NeedReflow is a
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// non-inherited hint.
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result |= nsChangeHint_NeedReflow;
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}
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if (NS_IsHintSubset(nsChangeHint_ReflowChangesSizeOrPosition,
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aChangeHint)) {
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// If NeedDirtyReflow is *not* set, then ReflowChangesSizeOrPosition is a
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// non-inherited hint.
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result |= nsChangeHint_ReflowChangesSizeOrPosition;
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}
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}
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if (!NS_IsHintSubset(nsChangeHint_ClearDescendantIntrinsics, aChangeHint) &&
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NS_IsHintSubset(nsChangeHint_ClearAncestorIntrinsics, aChangeHint)) {
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// If ClearDescendantIntrinsics is *not* set, then
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// ClearAncestorIntrinsics is a non-inherited hint.
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result |= nsChangeHint_ClearAncestorIntrinsics;
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}
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MOZ_ASSERT(NS_IsHintSubset(result,
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nsChangeHint_Hints_NotHandledForDescendants),
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"something is inconsistent");
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return result;
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}
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inline nsChangeHint
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NS_HintsHandledForDescendantsIn(nsChangeHint aChangeHint)
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{
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return aChangeHint & ~NS_HintsNotHandledForDescendantsIn(aChangeHint);
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}
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// Returns the change hints in aOurChange that are not subsumed by those
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// in aHintsHandled (which are hints that have been handled by an ancestor).
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inline nsChangeHint
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NS_RemoveSubsumedHints(nsChangeHint aOurChange, nsChangeHint aHintsHandled)
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{
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nsChangeHint result =
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aOurChange & ~NS_HintsHandledForDescendantsIn(aHintsHandled);
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if (result & (nsChangeHint_ClearAncestorIntrinsics |
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nsChangeHint_ClearDescendantIntrinsics |
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nsChangeHint_NeedDirtyReflow |
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nsChangeHint_ReflowChangesSizeOrPosition |
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nsChangeHint_UpdateComputedBSize)) {
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result |= nsChangeHint_NeedReflow;
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}
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if (result & (nsChangeHint_ClearDescendantIntrinsics)) {
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MOZ_ASSERT(result & nsChangeHint_ClearAncestorIntrinsics);
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result |= // nsChangeHint_ClearAncestorIntrinsics |
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nsChangeHint_NeedDirtyReflow;
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}
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return result;
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}
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/**
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* |nsRestyleHint| is a bitfield for the result of
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* |HasStateDependentStyle| and |HasAttributeDependentStyle|. When no
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* restyling is necessary, use |nsRestyleHint(0)|.
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*
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* Without eRestyle_Force or eRestyle_ForceDescendants, the restyling process
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* can stop processing at a frame when it detects no style changes and it is
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* known that the styles of the subtree beneath it will not change, leaving
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* the old ComputedStyle on the frame. eRestyle_Force can be used to skip this
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* optimization on a frame, and to force its new ComputedStyle to be used.
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*
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* Similarly, eRestyle_ForceDescendants will cause the frame and all of its
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* descendants to be traversed and for the new ComputedStyles that are created
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* to be set on the frames.
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*
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* NOTE: When adding new restyle hints, please also add them to
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* RestyleManager::RestyleHintToString.
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*/
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enum nsRestyleHint : uint32_t {
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// Rerun selector matching on the element. If a new ComputedStyle
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// results, update the ComputedStyles of descendants. (Irrelevant if
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// eRestyle_Subtree is also set, since that implies a superset of the
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// work.)
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eRestyle_Self = 1 << 0,
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// Rerun selector matching on descendants of the element that match
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// a given selector.
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eRestyle_SomeDescendants = 1 << 1,
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// Rerun selector matching on the element and all of its descendants.
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// (Implies eRestyle_ForceDescendants, which ensures that we continue
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// the restyling process for all descendants, but doesn't cause
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// selector matching.)
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eRestyle_Subtree = 1 << 2,
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// Rerun selector matching on all later siblings of the element and
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// all of their descendants.
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eRestyle_LaterSiblings = 1 << 3,
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// Replace the style data coming from CSS transitions without updating
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// any other style data. If a new ComputedStyle results, update style
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// contexts on the descendants. (Irrelevant if eRestyle_Self or
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// eRestyle_Subtree is also set, since those imply a superset of the
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// work.)
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eRestyle_CSSTransitions = 1 << 4,
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// Replace the style data coming from CSS animations without updating
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// any other style data. If a new ComputedStyle results, update style
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// contexts on the descendants. (Irrelevant if eRestyle_Self or
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// eRestyle_Subtree is also set, since those imply a superset of the
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// work.)
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eRestyle_CSSAnimations = 1 << 5,
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// Replace the style data coming from inline style without updating
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// any other style data. If a new ComputedStyle results, update style
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// contexts on the descendants. (Irrelevant if eRestyle_Self or
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// eRestyle_Subtree is also set, since those imply a superset of the
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// work.) Supported only for element ComputedStyles and not for
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// pseudo-elements or anonymous boxes, on which it converts to
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// eRestyle_Self.
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// If the change is for the advance of a declarative animation, use
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// the value below instead.
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eRestyle_StyleAttribute = 1 << 6,
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// Same as eRestyle_StyleAttribute, but for when the change results
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// from the advance of a declarative animation.
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eRestyle_StyleAttribute_Animations = 1 << 7,
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// Continue the restyling process to the current frame's children even
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// if this frame's restyling resulted in no style changes.
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eRestyle_Force = 1 << 8,
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// Continue the restyling process to all of the current frame's
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// descendants, even if any frame's restyling resulted in no style
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// changes. (Implies eRestyle_Force.) Note that this is weaker than
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// eRestyle_Subtree, which makes us rerun selector matching on all
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// descendants rather than just continuing the restyling process.
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eRestyle_ForceDescendants = 1 << 9,
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// Useful unions:
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eRestyle_AllHintsWithAnimations = eRestyle_CSSTransitions |
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eRestyle_CSSAnimations |
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eRestyle_StyleAttribute_Animations,
|
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};
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// The functions below need an integral type to cast to to avoid
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// infinite recursion.
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typedef decltype(nsRestyleHint(0) + nsRestyleHint(0)) nsRestyleHint_size_t;
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inline constexpr nsRestyleHint operator|(nsRestyleHint aLeft,
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nsRestyleHint aRight)
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{
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return nsRestyleHint(nsRestyleHint_size_t(aLeft) |
|
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nsRestyleHint_size_t(aRight));
|
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}
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inline constexpr nsRestyleHint operator&(nsRestyleHint aLeft,
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nsRestyleHint aRight)
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{
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return nsRestyleHint(nsRestyleHint_size_t(aLeft) &
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nsRestyleHint_size_t(aRight));
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}
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inline nsRestyleHint& operator|=(nsRestyleHint& aLeft, nsRestyleHint aRight)
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{
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return aLeft = aLeft | aRight;
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}
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inline nsRestyleHint& operator&=(nsRestyleHint& aLeft, nsRestyleHint aRight)
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{
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return aLeft = aLeft & aRight;
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}
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inline constexpr nsRestyleHint operator~(nsRestyleHint aArg)
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{
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return nsRestyleHint(~nsRestyleHint_size_t(aArg));
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}
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inline constexpr nsRestyleHint operator^(nsRestyleHint aLeft,
|
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nsRestyleHint aRight)
|
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{
|
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return nsRestyleHint(nsRestyleHint_size_t(aLeft) ^
|
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nsRestyleHint_size_t(aRight));
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}
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inline nsRestyleHint operator^=(nsRestyleHint& aLeft, nsRestyleHint aRight)
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{
|
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return aLeft = aLeft ^ aRight;
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}
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#endif /* nsChangeHint_h___ */
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