The Tor Browser: gfx/layers/LayerTreeInvalidation.h@97036ab72558

Conditionally force memory storage according to privacy.thirdparty.isolate;
This solves Tor bug #9701, complying with disk avoidance documented in
https://www.torproject.org/projects/torbrowser/design/#disk-avoidance.

     1 /*-*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this file,

     4  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef GFX_LAYER_TREE_INVALIDATION_H

     7 #define GFX_LAYER_TREE_INVALIDATION_H

     9 #include "nsRegion.h"                   // for nsIntRegion

    11 class nsPresContext;

    12 struct nsIntPoint;

    14 namespace mozilla {

    15 namespace layers {

    17 class Layer;

    18 class ContainerLayer;

    20 /**

    21  * Callback for ContainerLayer invalidations.

    22  *

    23  * @param aContainer ContainerLayer being invalidated.

    24  * @param aRegion Invalidated region in the ContainerLayer's coordinate

    25  * space.

    26  */

    27 typedef void (*NotifySubDocInvalidationFunc)(ContainerLayer* aLayer,

    28                                              const nsIntRegion& aRegion);

    30 /**

    31  * A set of cached layer properties (including those of child layers),

    32  * used for comparing differences in layer trees.

    33  */

    34 struct LayerProperties

    35 {

    36   virtual ~LayerProperties() {}

    38   /**

    39    * Copies the current layer tree properties into

    40    * a new LayerProperties object.

    41    *

    42    * @param Layer tree to copy, or nullptr if we have no

    43    * initial layer tree.

    44    */

    45   static LayerProperties* CloneFrom(Layer* aRoot);

    47   /**

    48    * Clear all invalidation status from this layer tree.

    49    */

    50   static void ClearInvalidations(Layer* aRoot);

    52   /**

    53    * Compares a set of existing layer tree properties to the current layer

    54    * tree and generates the changed rectangle.

    55    *

    56    * @param aRoot Root layer of the layer tree to compare against.

    57    * @param aCallback If specified, callback to call when ContainerLayers

    58    * are invalidated.

    59    * @return Painted area changed by the layer tree changes.

    60    */

    61   virtual nsIntRegion ComputeDifferences(Layer* aRoot,

    62                                          NotifySubDocInvalidationFunc aCallback,

    63                                          bool* aGeometryChanged = nullptr) = 0;

    66   virtual void MoveBy(const nsIntPoint& aOffset) = 0;

    67 };

    69 } // namespace layers

    70 } // namespace mozilla

    72 #endif /* GFX_LAYER_TREE_INVALIDATON_H */

The Tor Browser / file revision

gfx/layers/LayerTreeInvalidation.h@97036ab72558

gfx/layers/LayerTreeInvalidation.h