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/* -*- 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 GFX_LAYER_TREE_INVALIDATION_H
#define GFX_LAYER_TREE_INVALIDATION_H
#include "nsRegion.h" // for nsIntRegion
#include "mozilla/UniquePtr.h" // for UniquePtr
#include "mozilla/gfx/Point.h"
namespace mozilla {
namespace layers {
class Layer;
class ContainerLayer;
/**
* Callback for ContainerLayer invalidations.
*
* @param aContainer ContainerLayer being invalidated.
* @param aRegion Invalidated region in the ContainerLayer's coordinate
* space. If null, then the entire region must be invalidated.
*/
typedef void (*NotifySubDocInvalidationFunc)(ContainerLayer* aLayer,
const nsIntRegion* aRegion);
/**
* A set of cached layer properties (including those of child layers),
* used for comparing differences in layer trees.
*/
struct LayerProperties {
protected:
LayerProperties() = default;
LayerProperties(const LayerProperties& a) = delete;
LayerProperties& operator=(const LayerProperties& a) = delete;
public:
virtual ~LayerProperties() = default;
/**
* Copies the current layer tree properties into
* a new LayerProperties object.
*
* @param Layer tree to copy, or nullptr if we have no
* initial layer tree.
*/
static UniquePtr<LayerProperties> CloneFrom(Layer* aRoot);
/**
* Clear all invalidation status from this layer tree.
*/
static void ClearInvalidations(Layer* aRoot);
/**
* Compares a set of existing layer tree properties to the current layer
* tree and generates the changed rectangle.
*
* @param aRoot Root layer of the layer tree to compare against.
* @param aOutRegion Outparam that will contain the painted area changed by
* the layer tree changes.
* @param aCallback If specified, callback to call when ContainerLayers
* are invalidated.
* @return True on success, false if a calculation overflowed and the entire
* layer tree area should be considered invalidated.
*/
virtual bool ComputeDifferences(Layer* aRoot, nsIntRegion& aOutRegion,
NotifySubDocInvalidationFunc aCallback) = 0;
virtual void MoveBy(const gfx::IntPoint& aOffset) = 0;
};
} // namespace layers
} // namespace mozilla
#endif /* GFX_LAYER_TREE_INVALIDATON_H */
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