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ff30284171
Restyling margin-top and margin-bottom will typically require reflow and cause sibling elements to be moved and invalidated, so it's not a big win to layerize such nodes. However, layerizing them should be relatively harmless. --HG-- extra : rebase_source : 659593b6b6990aa859144641eb23e7ccf384a82a
87 lines
2.9 KiB
C++
87 lines
2.9 KiB
C++
/* 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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#ifndef ACTIVELAYERTRACKER_H_
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#define ACTIVELAYERTRACKER_H_
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#include "nsCSSProperty.h"
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class nsIFrame;
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namespace mozilla {
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/**
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* This class receives various notifications about style changes and content
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* changes that affect layerization decisions, and implements the heuristics
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* that drive those decisions. It manages per-frame state to support those
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* heuristics.
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*/
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class ActiveLayerTracker {
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public:
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static void Shutdown();
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/*
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* We track style changes to selected styles:
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* eCSSProperty_transform
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* eCSSProperty_opacity
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* eCSSProperty_left, eCSSProperty_top, eCSSProperty_right, eCSSProperty_bottom
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* and use that information to guess whether style changes are animated.
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*/
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/**
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* Notify aFrame's style property as having changed due to a restyle,
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* and therefore possibly wanting an active layer to render that style.
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* Any such marking will time out after a short period.
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* @param aProperty the property that has changed
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*/
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static void NotifyRestyle(nsIFrame* aFrame, nsCSSProperty aProperty);
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/**
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* Notify aFrame's left/top/right/bottom properties as having (maybe)
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* changed due to a restyle, and therefore possibly wanting an active layer
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* to render that style. Any such marking will time out after a short period.
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*/
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static void NotifyOffsetRestyle(nsIFrame* aFrame);
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/**
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* Mark aFrame as being known to have an animation of aProperty.
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* Any such marking will time out after a short period.
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*/
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static void NotifyAnimated(nsIFrame* aFrame, nsCSSProperty aProperty);
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/**
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* Notify that a property in the inline style rule of aFrame's element
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* has been modified.
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* This notification is incomplete --- not all modifications to inline
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* style will trigger this.
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*/
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static void NotifyInlineStyleRuleModified(nsIFrame* aFrame, nsCSSProperty aProperty);
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/**
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* Return true if aFrame's aProperty style should be considered as being animated
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* for constructing active layers.
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*/
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static bool IsStyleAnimated(nsIFrame* aFrame, nsCSSProperty aProperty);
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/**
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* Return true if any of aFrame's offset property styles should be considered
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* as being animated for constructing active layers.
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*/
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static bool IsOffsetOrMarginStyleAnimated(nsIFrame* aFrame);
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/*
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* We track modifications to the content of certain frames (i.e. canvas frames)
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* and use that to make layering decisions.
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*/
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/**
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* Mark aFrame's content as being active. This marking will time out after
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* a short period.
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*/
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static void NotifyContentChange(nsIFrame* aFrame);
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/**
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* Return true if this frame's content is still marked as active.
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*/
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static bool IsContentActive(nsIFrame* aFrame);
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};
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}
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#endif /* ACTIVELAYERTRACKER_H_ */
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