зеркало из https://github.com/mozilla/gecko-dev.git
72 строки
2.0 KiB
C++
72 строки
2.0 KiB
C++
/*-*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef GFX_LAYER_TREE_INVALIDATION_H
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#define GFX_LAYER_TREE_INVALIDATION_H
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#include "nsRegion.h" // for nsIntRegion
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class nsPresContext;
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struct nsIntPoint;
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namespace mozilla {
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namespace layers {
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class Layer;
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class ContainerLayer;
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/**
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* Callback for ContainerLayer invalidations.
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*
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* @param aContainer ContainerLayer being invalidated.
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* @param aRegion Invalidated region in the ContainerLayer's coordinate
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* space.
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*/
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typedef void (*NotifySubDocInvalidationFunc)(ContainerLayer* aLayer,
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const nsIntRegion& aRegion);
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/**
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* A set of cached layer properties (including those of child layers),
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* used for comparing differences in layer trees.
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*/
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struct LayerProperties
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{
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virtual ~LayerProperties() {}
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/**
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* Copies the current layer tree properties into
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* a new LayerProperties object.
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*
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* @param Layer tree to copy, or nullptr if we have no
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* initial layer tree.
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*/
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static LayerProperties* CloneFrom(Layer* aRoot);
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/**
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* Clear all invalidation status from this layer tree.
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*/
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static void ClearInvalidations(Layer* aRoot);
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/**
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* Compares a set of existing layer tree properties to the current layer
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* tree and generates the changed rectangle.
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*
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* @param aRoot Root layer of the layer tree to compare against.
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* @param aCallback If specified, callback to call when ContainerLayers
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* are invalidated.
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* @return Painted area changed by the layer tree changes.
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*/
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virtual nsIntRegion ComputeDifferences(Layer* aRoot,
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NotifySubDocInvalidationFunc aCallback) = 0;
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virtual void MoveBy(const nsIntPoint& aOffset) = 0;
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};
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} // namespace layers
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} // namespace mozilla
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#endif /* GFX_LAYER_TREE_INVALIDATON_H */
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