mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-15 06:15:43 +00:00
f6a6550205
This cleans up after bug 984226, which introduced
CHILDREN_AND_PARENT_CHANGED to deal with the facts that:
(1) most properties whose changes yield UpdateOverflow style hints
imply that an element's overflow area may have changed, and
propagation to ancestors can stop without updating the element's
parent if the element's own overflow area didn't change.
(2) a few properties whose changes yield UpdateOverflow style hints
actually don't change the overflow area of the element on which the
property changed, but instead change that element's overflow area
on the element's parent.
Having two separate hints means that we don't have to do the extra work
of always updating the parent's overflow area (when the child's overflow
area didn't actually change) for the properties in category (1), and we
don't have to do extra work of updating the element's own overflow area
for properties in category (2).
422 lines
16 KiB
C
422 lines
16 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* constants for what needs to be recomputed in response to style changes */
|
|
|
|
#ifndef nsChangeHint_h___
|
|
#define nsChangeHint_h___
|
|
|
|
#include "nsDebug.h"
|
|
#include "mozilla/Types.h"
|
|
|
|
// Defines for various style related constants
|
|
|
|
enum nsChangeHint {
|
|
// change was visual only (e.g., COLOR=)
|
|
// Invalidates all descendant frames (including following
|
|
// placeholders to out-of-flow frames).
|
|
nsChangeHint_RepaintFrame = 0x01,
|
|
|
|
// For reflow, we want flags to give us arbitrary FrameNeedsReflow behavior.
|
|
// just do a FrameNeedsReflow.
|
|
nsChangeHint_NeedReflow = 0x02,
|
|
|
|
// Invalidate intrinsic widths on the frame's ancestors. Must not be set
|
|
// without setting nsChangeHint_NeedReflow.
|
|
nsChangeHint_ClearAncestorIntrinsics = 0x04,
|
|
|
|
// Invalidate intrinsic widths on the frame's descendants. Must not be set
|
|
// without also setting nsChangeHint_ClearAncestorIntrinsics.
|
|
nsChangeHint_ClearDescendantIntrinsics = 0x08,
|
|
|
|
// Force unconditional reflow of all descendants. Must not be set without
|
|
// setting nsChangeHint_NeedReflow, but is independent of both the
|
|
// Clear*Intrinsics flags.
|
|
nsChangeHint_NeedDirtyReflow = 0x10,
|
|
|
|
// change requires view to be updated, if there is one (e.g., clip:).
|
|
// Updates all descendants (including following placeholders to out-of-flows).
|
|
nsChangeHint_SyncFrameView = 0x20,
|
|
|
|
// The currently shown mouse cursor needs to be updated
|
|
nsChangeHint_UpdateCursor = 0x40,
|
|
|
|
/**
|
|
* Used when the computed value (a URI) of one or more of an element's
|
|
* filter/mask/clip/etc CSS properties changes, causing the element's frame
|
|
* to start/stop referencing (or reference different) SVG resource elements.
|
|
* (_Not_ used to handle changes to referenced resource elements.) Using this
|
|
* hint results in nsSVGEffects::UpdateEffects being called on the element's
|
|
* frame.
|
|
*/
|
|
nsChangeHint_UpdateEffects = 0x80,
|
|
|
|
/**
|
|
* Visual change only, but the change can be handled entirely by
|
|
* updating the layer(s) for the frame.
|
|
* Updates all descendants (including following placeholders to out-of-flows).
|
|
*/
|
|
nsChangeHint_UpdateOpacityLayer = 0x100,
|
|
/**
|
|
* Updates all descendants. Any placeholder descendants' out-of-flows
|
|
* are also descendants of the transformed frame, so they're updated.
|
|
*/
|
|
nsChangeHint_UpdateTransformLayer = 0x200,
|
|
|
|
/**
|
|
* Change requires frame change (e.g., display:).
|
|
* This subsumes all the above. Reconstructs all frame descendants,
|
|
* including following placeholders to out-of-flows.
|
|
*/
|
|
nsChangeHint_ReconstructFrame = 0x400,
|
|
|
|
/**
|
|
* The frame's overflow area has changed. Does not update any descendant
|
|
* frames.
|
|
*/
|
|
nsChangeHint_UpdateOverflow = 0x800,
|
|
|
|
/**
|
|
* The overflow area of the frame and all of its descendants has changed. This
|
|
* can happen through a text-decoration change.
|
|
*/
|
|
nsChangeHint_UpdateSubtreeOverflow = 0x1000,
|
|
|
|
/**
|
|
* The frame's overflow area has changed, through a change in its transform.
|
|
* In other words, the frame's pre-transform overflow is unchanged, but
|
|
* its post-transform overflow has changed, and thus its effect on its
|
|
* parent's overflow has changed. If the pre-transform overflow has
|
|
* changed, see nsChangeHint_UpdateOverflow.
|
|
* Does not update any descendant frames.
|
|
*/
|
|
nsChangeHint_UpdatePostTransformOverflow = 0x2000,
|
|
|
|
/**
|
|
* This frame's effect on its parent's overflow area has changed.
|
|
* (But neither its pre-transform nor post-transform overflow have
|
|
* changed; if those are the case, see
|
|
* nsChangeHint_UpdatePostTransformOverflow.)
|
|
*/
|
|
nsChangeHint_UpdateParentOverflow = 0x4000,
|
|
|
|
/**
|
|
* The children-only transform of an SVG frame changed, requiring the
|
|
* overflow rects of the frame's immediate children to be updated.
|
|
*/
|
|
nsChangeHint_ChildrenOnlyTransform = 0x8000,
|
|
|
|
/**
|
|
* The frame's offsets have changed, while its dimensions might have
|
|
* changed as well. This hint is used for positioned frames if their
|
|
* offset changes. If we decide that the dimensions are likely to
|
|
* change, this will trigger a reflow.
|
|
*
|
|
* Note that this should probably be used in combination with
|
|
* nsChangeHint_UpdateOverflow in order to get the overflow areas of
|
|
* the ancestors updated as well.
|
|
*/
|
|
nsChangeHint_RecomputePosition = 0x10000,
|
|
|
|
/**
|
|
* Behaves like ReconstructFrame, but only if the frame has descendants
|
|
* that are absolutely or fixed position. Use this hint when a style change
|
|
* has changed whether the frame is a container for fixed-pos or abs-pos
|
|
* elements, but reframing is otherwise not needed.
|
|
*/
|
|
nsChangeHint_AddOrRemoveTransform = 0x20000,
|
|
|
|
/**
|
|
* This change hint has *no* change handling behavior. However, it
|
|
* exists to be a non-inherited hint, because when the border-style
|
|
* changes, and it's inherited by a child, that might require a reflow
|
|
* due to the border-width change on the child.
|
|
*/
|
|
nsChangeHint_BorderStyleNoneChange = 0x40000,
|
|
|
|
/**
|
|
* SVG textPath needs to be recomputed because the path has changed.
|
|
* This means that the glyph positions of the text need to be recomputed.
|
|
*/
|
|
nsChangeHint_UpdateTextPath = 0x80000,
|
|
|
|
/**
|
|
* This will schedule an invalidating paint. This is useful if something
|
|
* has changed which will be invalidated by DLBI.
|
|
*/
|
|
nsChangeHint_SchedulePaint = 0x100000,
|
|
|
|
/**
|
|
* A hint reflecting that style data changed with no change handling
|
|
* behavior. We need to return this, rather than NS_STYLE_HINT_NONE,
|
|
* so that certain optimizations that manipulate the style context tree are
|
|
* correct.
|
|
*
|
|
* nsChangeHint_NeutralChange must be returned by CalcDifference on a given
|
|
* style struct if the data in the style structs are meaningfully different
|
|
* and if no other change hints are returned. If any other change hints are
|
|
* set, then nsChangeHint_NeutralChange need not also be included, but it is
|
|
* safe to do so. (An example of style structs having non-meaningfully
|
|
* different data would be cached information that would be re-calculated
|
|
* to the same values, such as nsStyleBorder::mSubImages.)
|
|
*/
|
|
nsChangeHint_NeutralChange = 0x200000,
|
|
|
|
/**
|
|
* This will cause rendering observers to be invalidated.
|
|
*/
|
|
nsChangeHint_InvalidateRenderingObservers = 0x400000
|
|
|
|
// IMPORTANT NOTE: When adding new hints, consider whether you need to
|
|
// add them to NS_HintsNotHandledForDescendantsIn() below. Please also
|
|
// add them to RestyleManager::ChangeHintToString.
|
|
};
|
|
|
|
// Redefine these operators to return nothing. This will catch any use
|
|
// of these operators on hints. We should not be using these operators
|
|
// on nsChangeHints
|
|
inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
|
|
|
|
// Operators on nsChangeHints
|
|
|
|
// Merge two hints, taking the union
|
|
inline nsChangeHint NS_CombineHint(nsChangeHint aH1, nsChangeHint aH2) {
|
|
return (nsChangeHint)(aH1 | aH2);
|
|
}
|
|
|
|
// Merge two hints, taking the union
|
|
inline nsChangeHint NS_SubtractHint(nsChangeHint aH1, nsChangeHint aH2) {
|
|
return (nsChangeHint)(aH1 & ~aH2);
|
|
}
|
|
|
|
// Merge the "src" hint into the "dst" hint
|
|
// Returns true iff the destination changed
|
|
inline bool NS_UpdateHint(nsChangeHint& aDest, nsChangeHint aSrc) {
|
|
nsChangeHint r = (nsChangeHint)(aDest | aSrc);
|
|
bool changed = (int)r != (int)aDest;
|
|
aDest = r;
|
|
return changed;
|
|
}
|
|
|
|
// Returns true iff the second hint contains all the hints of the first hint
|
|
inline bool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
|
|
return (aSubset & aSuperSet) == aSubset;
|
|
}
|
|
|
|
/**
|
|
* We have an optimization when processing change hints which prevents
|
|
* us from visiting the descendants of a node when a hint on that node
|
|
* is being processed. This optimization does not apply in some of the
|
|
* cases where applying a hint to an element does not necessarily result
|
|
* in the same hint being handled on the descendants.
|
|
*/
|
|
|
|
// The most hints that NS_HintsNotHandledForDescendantsIn could possibly return:
|
|
#define nsChangeHint_Hints_NotHandledForDescendants nsChangeHint( \
|
|
nsChangeHint_UpdateTransformLayer | \
|
|
nsChangeHint_UpdateEffects | \
|
|
nsChangeHint_InvalidateRenderingObservers | \
|
|
nsChangeHint_UpdateOpacityLayer | \
|
|
nsChangeHint_UpdateOverflow | \
|
|
nsChangeHint_UpdatePostTransformOverflow | \
|
|
nsChangeHint_UpdateParentOverflow | \
|
|
nsChangeHint_ChildrenOnlyTransform | \
|
|
nsChangeHint_RecomputePosition | \
|
|
nsChangeHint_AddOrRemoveTransform | \
|
|
nsChangeHint_BorderStyleNoneChange | \
|
|
nsChangeHint_NeedReflow | \
|
|
nsChangeHint_ClearAncestorIntrinsics)
|
|
|
|
inline nsChangeHint NS_HintsNotHandledForDescendantsIn(nsChangeHint aChangeHint) {
|
|
nsChangeHint result = nsChangeHint(aChangeHint & (
|
|
nsChangeHint_UpdateTransformLayer |
|
|
nsChangeHint_UpdateEffects |
|
|
nsChangeHint_InvalidateRenderingObservers |
|
|
nsChangeHint_UpdateOpacityLayer |
|
|
nsChangeHint_UpdateOverflow |
|
|
nsChangeHint_UpdatePostTransformOverflow |
|
|
nsChangeHint_UpdateParentOverflow |
|
|
nsChangeHint_ChildrenOnlyTransform |
|
|
nsChangeHint_RecomputePosition |
|
|
nsChangeHint_AddOrRemoveTransform |
|
|
nsChangeHint_BorderStyleNoneChange));
|
|
|
|
if (!NS_IsHintSubset(nsChangeHint_NeedDirtyReflow, aChangeHint) &&
|
|
NS_IsHintSubset(nsChangeHint_NeedReflow, aChangeHint)) {
|
|
// If NeedDirtyReflow is *not* set, then NeedReflow is a
|
|
// non-inherited hint.
|
|
NS_UpdateHint(result, nsChangeHint_NeedReflow);
|
|
}
|
|
|
|
if (!NS_IsHintSubset(nsChangeHint_ClearDescendantIntrinsics, aChangeHint) &&
|
|
NS_IsHintSubset(nsChangeHint_ClearAncestorIntrinsics, aChangeHint)) {
|
|
// If ClearDescendantIntrinsics is *not* set, then
|
|
// ClearAncestorIntrinsics is a non-inherited hint.
|
|
NS_UpdateHint(result, nsChangeHint_ClearAncestorIntrinsics);
|
|
}
|
|
|
|
MOZ_ASSERT(NS_IsHintSubset(result,
|
|
nsChangeHint_Hints_NotHandledForDescendants),
|
|
"something is inconsistent");
|
|
|
|
return result;
|
|
}
|
|
|
|
// Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
|
|
#define NS_STYLE_HINT_NONE \
|
|
nsChangeHint(0)
|
|
#define NS_STYLE_HINT_VISUAL \
|
|
nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView | \
|
|
nsChangeHint_SchedulePaint)
|
|
#define nsChangeHint_AllReflowHints \
|
|
nsChangeHint(nsChangeHint_NeedReflow | \
|
|
nsChangeHint_ClearAncestorIntrinsics | \
|
|
nsChangeHint_ClearDescendantIntrinsics | \
|
|
nsChangeHint_NeedDirtyReflow)
|
|
#define NS_STYLE_HINT_REFLOW \
|
|
nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_AllReflowHints)
|
|
#define NS_STYLE_HINT_FRAMECHANGE \
|
|
nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_ReconstructFrame)
|
|
|
|
/**
|
|
* |nsRestyleHint| is a bitfield for the result of
|
|
* |HasStateDependentStyle| and |HasAttributeDependentStyle|. When no
|
|
* restyling is necessary, use |nsRestyleHint(0)|.
|
|
*
|
|
* Without eRestyle_Force or eRestyle_ForceDescendants, the restyling process
|
|
* can stop processing at a frame when it detects no style changes and it is
|
|
* known that the styles of the subtree beneath it will not change, leaving
|
|
* the old style context on the frame. eRestyle_Force can be used to skip this
|
|
* optimization on a frame, and to force its new style context to be used.
|
|
*
|
|
* Similarly, eRestyle_ForceDescendants will cause the frame and all of its
|
|
* descendants to be traversed and for the new style contexts that are created
|
|
* to be set on the frames.
|
|
*
|
|
* NOTE: When adding new restyle hints, please also add them to
|
|
* RestyleManager::RestyleHintToString.
|
|
*/
|
|
enum nsRestyleHint {
|
|
// Rerun selector matching on the element. If a new style context
|
|
// results, update the style contexts of descendants. (Irrelevant if
|
|
// eRestyle_Subtree is also set, since that implies a superset of the
|
|
// work.)
|
|
eRestyle_Self = (1<<0),
|
|
|
|
// Rerun selector matching on the element and all of its descendants.
|
|
// (Implies eRestyle_ForceDescendants, which ensures that we continue
|
|
// the restyling process for all descendants, but doesn't cause
|
|
// selector matching.)
|
|
eRestyle_Subtree = (1<<1),
|
|
|
|
// Rerun selector matching on all later siblings of the element and
|
|
// all of their descendants.
|
|
eRestyle_LaterSiblings = (1<<2),
|
|
|
|
// Replace the style data coming from CSS transitions without updating
|
|
// any other style data. If a new style context results, update style
|
|
// contexts on the descendants. (Irrelevant if eRestyle_Self or
|
|
// eRestyle_Subtree is also set, since those imply a superset of the
|
|
// work.)
|
|
eRestyle_CSSTransitions = (1<<3),
|
|
|
|
// Replace the style data coming from CSS animations without updating
|
|
// any other style data. If a new style context results, update style
|
|
// contexts on the descendants. (Irrelevant if eRestyle_Self or
|
|
// eRestyle_Subtree is also set, since those imply a superset of the
|
|
// work.)
|
|
eRestyle_CSSAnimations = (1<<4),
|
|
|
|
// Replace the style data coming from SVG animations (SMIL Animations)
|
|
// without updating any other style data. If a new style context
|
|
// results, update style contexts on the descendants. (Irrelevant if
|
|
// eRestyle_Self or eRestyle_Subtree is also set, since those imply a
|
|
// superset of the work.)
|
|
eRestyle_SVGAttrAnimations = (1<<5),
|
|
|
|
// Replace the style data coming from inline style without updating
|
|
// any other style data. If a new style context results, update style
|
|
// contexts on the descendants. (Irrelevant if eRestyle_Self or
|
|
// eRestyle_Subtree is also set, since those imply a superset of the
|
|
// work.) Supported only for element style contexts and not for
|
|
// pseudo-elements or anonymous boxes, on which it converts to
|
|
// eRestyle_Self.
|
|
eRestyle_StyleAttribute = (1<<6),
|
|
|
|
// Additional restyle hint to be used along with CSSTransitions,
|
|
// CSSAnimations, SVGAttrAnimations, or StyleAttribute. This
|
|
// indicates that along with the replacement given, appropriate
|
|
// switching between the style with animation and style without
|
|
// animation should be performed by adding or removing rules that
|
|
// should be present only in the style with animation.
|
|
// This is implied by eRestyle_Self or eRestyle_Subtree.
|
|
// FIXME: Remove this as part of bug 960465.
|
|
eRestyle_ChangeAnimationPhase = (1 << 7),
|
|
|
|
// Same as the previous, except this applies to the entire subtree.
|
|
// FIXME: Remove this as part of bug 960465.
|
|
eRestyle_ChangeAnimationPhaseDescendants = (1 << 8),
|
|
|
|
// Continue the restyling process to the current frame's children even
|
|
// if this frame's restyling resulted in no style changes.
|
|
eRestyle_Force = (1<<9),
|
|
|
|
// Continue the restyling process to all of the current frame's
|
|
// descendants, even if any frame's restyling resulted in no style
|
|
// changes. (Implies eRestyle_Force.) Note that this is weaker than
|
|
// eRestyle_Subtree, which makes us rerun selector matching on all
|
|
// descendants rather than just continuing the restyling process.
|
|
eRestyle_ForceDescendants = (1<<10),
|
|
};
|
|
|
|
// The functions below need an integral type to cast to to avoid
|
|
// infinite recursion.
|
|
typedef decltype(nsRestyleHint(0) + nsRestyleHint(0)) nsRestyleHint_size_t;
|
|
|
|
inline nsRestyleHint operator|(nsRestyleHint aLeft, nsRestyleHint aRight)
|
|
{
|
|
return nsRestyleHint(nsRestyleHint_size_t(aLeft) |
|
|
nsRestyleHint_size_t(aRight));
|
|
}
|
|
|
|
inline nsRestyleHint operator&(nsRestyleHint aLeft, nsRestyleHint aRight)
|
|
{
|
|
return nsRestyleHint(nsRestyleHint_size_t(aLeft) &
|
|
nsRestyleHint_size_t(aRight));
|
|
}
|
|
|
|
inline nsRestyleHint& operator|=(nsRestyleHint& aLeft, nsRestyleHint aRight)
|
|
{
|
|
return aLeft = aLeft | aRight;
|
|
}
|
|
|
|
inline nsRestyleHint& operator&=(nsRestyleHint& aLeft, nsRestyleHint aRight)
|
|
{
|
|
return aLeft = aLeft & aRight;
|
|
}
|
|
|
|
inline nsRestyleHint operator~(nsRestyleHint aArg)
|
|
{
|
|
return nsRestyleHint(~nsRestyleHint_size_t(aArg));
|
|
}
|
|
|
|
inline nsRestyleHint operator^(nsRestyleHint aLeft, nsRestyleHint aRight)
|
|
{
|
|
return nsRestyleHint(nsRestyleHint_size_t(aLeft) ^
|
|
nsRestyleHint_size_t(aRight));
|
|
}
|
|
|
|
inline nsRestyleHint operator^=(nsRestyleHint& aLeft, nsRestyleHint aRight)
|
|
{
|
|
return aLeft = aLeft ^ aRight;
|
|
}
|
|
|
|
#endif /* nsChangeHint_h___ */
|