зеркало из https://github.com/mozilla/gecko-dev.git
103 строки
3.7 KiB
C++
103 строки
3.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#ifndef ACTIVELAYERTRACKER_H_
|
|
#define ACTIVELAYERTRACKER_H_
|
|
|
|
#include "nsCSSPropertyID.h"
|
|
|
|
class nsIFrame;
|
|
class nsIContent;
|
|
class nsCSSPropertyIDSet;
|
|
class nsDOMCSSDeclaration;
|
|
|
|
namespace mozilla {
|
|
|
|
class nsDisplayListBuilder;
|
|
|
|
/**
|
|
* This class receives various notifications about style changes and content
|
|
* changes that affect layerization decisions, and implements the heuristics
|
|
* that drive those decisions. It manages per-frame state to support those
|
|
* heuristics.
|
|
*/
|
|
class ActiveLayerTracker {
|
|
public:
|
|
static void Shutdown();
|
|
|
|
/*
|
|
* We track style changes to selected styles:
|
|
* eCSSProperty_transform, eCSSProperty_translate,
|
|
* eCSSProperty_rotate, eCSSProperty_scale
|
|
* eCSSProperty_offset_path, eCSSProperty_offset_distance,
|
|
* eCSSProperty_offset_rotate, eCSSProperty_offset_anchor,
|
|
* eCSSProperty_offset_position, eCSSProperty_opacity
|
|
* and use that information to guess whether style changes are animated.
|
|
*/
|
|
|
|
/**
|
|
* Notify aFrame's style property as having changed due to a restyle,
|
|
* and therefore possibly wanting an active layer to render that style.
|
|
* Any such marking will time out after a short period.
|
|
* @param aProperty the property that has changed
|
|
*/
|
|
static void NotifyRestyle(nsIFrame* aFrame, nsCSSPropertyID aProperty);
|
|
|
|
/**
|
|
* Notify that a property in the inline style rule of aFrame's element
|
|
* has been modified.
|
|
*/
|
|
static void NotifyInlineStyleRuleModified(nsIFrame* aFrame,
|
|
nsCSSPropertyID aProperty);
|
|
/**
|
|
* Notify that a frame needs to be repainted. This is important for layering
|
|
* decisions where, say, aFrame's transform is updated from JS, but we need
|
|
* to repaint aFrame anyway, so we get no benefit from giving it its own
|
|
* layer.
|
|
*/
|
|
static void NotifyNeedsRepaint(nsIFrame* aFrame);
|
|
/**
|
|
* Return true if aFrame's property style in |aPropertySet| should be
|
|
* considered as being animated for constructing active layers.
|
|
*/
|
|
static bool IsStyleAnimated(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame,
|
|
const nsCSSPropertyIDSet& aPropertySet);
|
|
/**
|
|
* Return true if aFrame's transform-like property,
|
|
* i.e. transform/translate/rotate/scale, is animated.
|
|
*/
|
|
static bool IsTransformAnimated(nsDisplayListBuilder* aBuilder,
|
|
nsIFrame* aFrame);
|
|
/**
|
|
* Return true if aFrame's transform style should be considered as being
|
|
* animated for pre-rendering.
|
|
*/
|
|
static bool IsTransformMaybeAnimated(nsIFrame* aFrame);
|
|
/**
|
|
* Return true if aFrame either has an animated scale now, or is likely to
|
|
* have one in the future because it has a CSS animation or transition
|
|
* (which may not be playing right now) that affects its scale.
|
|
*/
|
|
static bool IsScaleSubjectToAnimation(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Transfer the LayerActivity property to the frame's content node when the
|
|
* frame is about to be destroyed so that layer activity can be tracked
|
|
* throughout reframes of an element. Only call this when aFrame is the
|
|
* primary frame of aContent.
|
|
*/
|
|
static void TransferActivityToContent(nsIFrame* aFrame, nsIContent* aContent);
|
|
/**
|
|
* Transfer the LayerActivity property back to the content node's primary
|
|
* frame after the frame has been created.
|
|
*/
|
|
static void TransferActivityToFrame(nsIContent* aContent, nsIFrame* aFrame);
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* ACTIVELAYERTRACKER_H_ */
|