1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/layers/LayerTreeInvalidation.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,72 @@
1.4 +/*-*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this file,
1.7 + * You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +#ifndef GFX_LAYER_TREE_INVALIDATION_H
1.10 +#define GFX_LAYER_TREE_INVALIDATION_H
1.11 +
1.12 +#include "nsRegion.h" // for nsIntRegion
1.13 +
1.14 +class nsPresContext;
1.15 +struct nsIntPoint;
1.16 +
1.17 +namespace mozilla {
1.18 +namespace layers {
1.19 +
1.20 +class Layer;
1.21 +class ContainerLayer;
1.22 +
1.23 +/**
1.24 + * Callback for ContainerLayer invalidations.
1.25 + *
1.26 + * @param aContainer ContainerLayer being invalidated.
1.27 + * @param aRegion Invalidated region in the ContainerLayer's coordinate
1.28 + * space.
1.29 + */
1.30 +typedef void (*NotifySubDocInvalidationFunc)(ContainerLayer* aLayer,
1.31 + const nsIntRegion& aRegion);
1.32 +
1.33 +/**
1.34 + * A set of cached layer properties (including those of child layers),
1.35 + * used for comparing differences in layer trees.
1.36 + */
1.37 +struct LayerProperties
1.38 +{
1.39 + virtual ~LayerProperties() {}
1.40 +
1.41 + /**
1.42 + * Copies the current layer tree properties into
1.43 + * a new LayerProperties object.
1.44 + *
1.45 + * @param Layer tree to copy, or nullptr if we have no
1.46 + * initial layer tree.
1.47 + */
1.48 + static LayerProperties* CloneFrom(Layer* aRoot);
1.49 +
1.50 + /**
1.51 + * Clear all invalidation status from this layer tree.
1.52 + */
1.53 + static void ClearInvalidations(Layer* aRoot);
1.54 +
1.55 + /**
1.56 + * Compares a set of existing layer tree properties to the current layer
1.57 + * tree and generates the changed rectangle.
1.58 + *
1.59 + * @param aRoot Root layer of the layer tree to compare against.
1.60 + * @param aCallback If specified, callback to call when ContainerLayers
1.61 + * are invalidated.
1.62 + * @return Painted area changed by the layer tree changes.
1.63 + */
1.64 + virtual nsIntRegion ComputeDifferences(Layer* aRoot,
1.65 + NotifySubDocInvalidationFunc aCallback,
1.66 + bool* aGeometryChanged = nullptr) = 0;
1.67 +
1.68 +
1.69 + virtual void MoveBy(const nsIntPoint& aOffset) = 0;
1.70 +};
1.71 +
1.72 +} // namespace layers
1.73 +} // namespace mozilla
1.74 +
1.75 +#endif /* GFX_LAYER_TREE_INVALIDATON_H */
