зеркало из https://github.com/mozilla/gecko-dev.git
514 строки
21 KiB
C++
514 строки
21 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 "mozilla/Assertions.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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// The currently shown mouse cursor needs to be updated
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nsChangeHint_UpdateCursor = 1 << 5,
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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 << 6,
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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 << 7,
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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 << 8,
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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 << 9,
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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 << 10,
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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 << 11,
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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 << 12,
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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 << 13,
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/**
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* The children-only transform of an SVG frame changed, requiring overflows to
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* be updated.
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*/
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nsChangeHint_ChildrenOnlyTransform = 1 << 14,
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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 << 15,
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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 << 16,
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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 << 17,
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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 << 18,
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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 << 19,
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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 << 20,
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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 consider adding nsChangeHint_ClearAncestorIntrinsics if needed.
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*/
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nsChangeHint_ReflowChangesSizeOrPosition = 1 << 21,
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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 << 22,
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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 << 23,
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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 << 24,
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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 << 25,
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/**
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* Indicates that the presence of scrollbars might have changed.
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*
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* This happens when at least one of overflow-{x,y} properties 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_ScrollbarChange = 1 << 26,
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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 << 27,
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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 << 28,
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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 << 29) - 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 operator|(nsChangeHint aLeft,
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nsChangeHint aRight) {
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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 operator&(nsChangeHint aLeft,
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nsChangeHint aRight) {
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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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return aLeft = aLeft | aRight;
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}
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inline nsChangeHint& operator&=(nsChangeHint& aLeft, nsChangeHint aRight) {
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return aLeft = aLeft & aRight;
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}
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inline nsChangeHint constexpr operator~(nsChangeHint aArg) {
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return nsChangeHint(~nsChangeHint_size_t(aArg));
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}
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inline nsChangeHint constexpr operator^(nsChangeHint aLeft,
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nsChangeHint aRight) {
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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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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 | nsChangeHint_NeedDirtyReflow | \
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nsChangeHint_NeutralChange | nsChangeHint_ReconstructFrame | \
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nsChangeHint_RepaintFrame | nsChangeHint_SchedulePaint | \
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nsChangeHint_UpdateCursor | nsChangeHint_UpdateSubtreeOverflow | \
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nsChangeHint_VisibilityChange)
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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 | nsChangeHint_ChildrenOnlyTransform | \
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nsChangeHint_ScrollbarChange | nsChangeHint_InvalidateRenderingObservers | \
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nsChangeHint_RecomputePosition | nsChangeHint_UpdateBackgroundPosition | \
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nsChangeHint_UpdateComputedBSize | nsChangeHint_UpdateContainingBlock | \
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nsChangeHint_UpdateEffects | nsChangeHint_UpdateOpacityLayer | \
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nsChangeHint_UpdateOverflow | nsChangeHint_UpdateParentOverflow | \
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nsChangeHint_UpdatePostTransformOverflow | \
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nsChangeHint_UpdateTableCellSpans | nsChangeHint_UpdateTransformLayer | \
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nsChangeHint_UpdateUsesOpacity | nsChangeHint_AddOrRemoveTransform)
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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 | nsChangeHint_NeedReflow | \
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nsChangeHint_ReflowChangesSizeOrPosition)
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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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// 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_SchedulePaint)
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#define nsChangeHint_AllReflowHints \
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nsChangeHint( \
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nsChangeHint_NeedReflow | nsChangeHint_ReflowChangesSizeOrPosition | \
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nsChangeHint_ClearAncestorIntrinsics | \
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nsChangeHint_ClearDescendantIntrinsics | 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( \
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(nsChangeHint_AllReflowHints | nsChangeHint_UpdateComputedBSize) & \
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~(nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow))
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// For a change in whether a scrollframe displays or not scrollbars.
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//
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// When requesting this reflow, we send the exact same change hints that "width"
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// and "height" would send (since conceptually, adding/removing scrollbars is
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// like changing the available space).
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//
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// FIXME(emilio): Seems we could be a bit more efficient here, as adding or
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// removing scrollbars doesn't change the size of the element itself, so maybe
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// ClearAncestorIntrinsics or ReflowChangesSizeOrPosition are not needed... I
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// think this ideally should be just nsChangehint_NeedReflow.
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#define nsChangeHint_ReflowHintsForScrollbarChange \
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nsChangeHint(nsChangeHint_ReflowHintsForBSizeChange | \
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nsChangeHint_ReflowHintsForISizeChange)
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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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// Change hints for added or removed transform style.
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//
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// If we've added or removed the transform property, we need to reconstruct the
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// frame to add or remove the view object, and also to handle abs-pos and
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// fixed-pos containers.
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//
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// We do not need to apply nsChangeHint_UpdateTransformLayer since
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// nsChangeHint_RepaintFrame will forcibly invalidate the frame area and
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// ensure layers are rebuilt (or removed).
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#define nsChangeHint_ComprehensiveAddOrRemoveTransform \
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nsChangeHint(nsChangeHint_UpdateContainingBlock | \
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nsChangeHint_AddOrRemoveTransform | \
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nsChangeHint_UpdateOverflow | nsChangeHint_RepaintFrame)
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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(
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nsChangeHint aChangeHint) {
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nsChangeHint result =
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aChangeHint & nsChangeHint_Hints_NeverHandledForDescendants;
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if (!(aChangeHint & nsChangeHint_NeedDirtyReflow)) {
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if (aChangeHint & nsChangeHint_NeedReflow) {
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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 (aChangeHint & nsChangeHint_ReflowChangesSizeOrPosition) {
|
|
// If NeedDirtyReflow is *not* set, then ReflowChangesSizeOrPosition is a
|
|
// non-inherited hint.
|
|
result |= nsChangeHint_ReflowChangesSizeOrPosition;
|
|
}
|
|
}
|
|
|
|
if (!(aChangeHint & nsChangeHint_ClearDescendantIntrinsics) &&
|
|
(aChangeHint & nsChangeHint_ClearAncestorIntrinsics)) {
|
|
// If ClearDescendantIntrinsics is *not* set, then
|
|
// ClearAncestorIntrinsics is a non-inherited hint.
|
|
result |= nsChangeHint_ClearAncestorIntrinsics;
|
|
}
|
|
|
|
MOZ_ASSERT(
|
|
NS_IsHintSubset(result, nsChangeHint_Hints_NotHandledForDescendants),
|
|
"something is inconsistent");
|
|
|
|
return result;
|
|
}
|
|
|
|
inline nsChangeHint NS_HintsHandledForDescendantsIn(nsChangeHint aChangeHint) {
|
|
return aChangeHint & ~NS_HintsNotHandledForDescendantsIn(aChangeHint);
|
|
}
|
|
|
|
// Returns the change hints in aOurChange that are not subsumed by those
|
|
// in aHintsHandled (which are hints that have been handled by an ancestor).
|
|
inline nsChangeHint NS_RemoveSubsumedHints(nsChangeHint aOurChange,
|
|
nsChangeHint aHintsHandled) {
|
|
nsChangeHint result =
|
|
aOurChange & ~NS_HintsHandledForDescendantsIn(aHintsHandled);
|
|
|
|
if (result &
|
|
(nsChangeHint_ClearAncestorIntrinsics |
|
|
nsChangeHint_ClearDescendantIntrinsics | nsChangeHint_NeedDirtyReflow |
|
|
nsChangeHint_ReflowChangesSizeOrPosition |
|
|
nsChangeHint_UpdateComputedBSize)) {
|
|
result |= nsChangeHint_NeedReflow;
|
|
}
|
|
|
|
if (result & (nsChangeHint_ClearDescendantIntrinsics)) {
|
|
MOZ_ASSERT(result & nsChangeHint_ClearAncestorIntrinsics);
|
|
result |= // nsChangeHint_ClearAncestorIntrinsics |
|
|
nsChangeHint_NeedDirtyReflow;
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
namespace mozilla {
|
|
|
|
struct StyleRestyleHint;
|
|
|
|
using RestyleHint = StyleRestyleHint;
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* nsChangeHint_h___ */
|