The Tor Browser: layout/svg/nsSVGMaskFrame.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

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

     6 #ifndef __NS_SVGMASKFRAME_H__

     7 #define __NS_SVGMASKFRAME_H__

     9 #include "mozilla/Attributes.h"

    10 #include "gfxPattern.h"

    11 #include "gfxMatrix.h"

    12 #include "nsSVGContainerFrame.h"

    13 #include "nsSVGUtils.h"

    15 class gfxContext;

    16 class nsRenderingContext;

    18 typedef nsSVGContainerFrame nsSVGMaskFrameBase;

    20 class nsSVGMaskFrame : public nsSVGMaskFrameBase

    21 {

    22   friend nsIFrame*

    23   NS_NewSVGMaskFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);

    24 protected:

    25   nsSVGMaskFrame(nsStyleContext* aContext)

    26     : nsSVGMaskFrameBase(aContext)

    27     , mInUse(false)

    28   {

    29     AddStateBits(NS_FRAME_IS_NONDISPLAY);

    30   }

    32 public:

    33   NS_DECL_FRAMEARENA_HELPERS

    35   // nsSVGMaskFrame method:

    36   already_AddRefed<gfxPattern> ComputeMaskAlpha(nsRenderingContext *aContext,

    37                                                 nsIFrame* aParent,

    38                                                 const gfxMatrix &aMatrix,

    39                                                 float aOpacity = 1.0f);

    41   virtual nsresult AttributeChanged(int32_t         aNameSpaceID,

    42                                     nsIAtom*        aAttribute,

    43                                     int32_t         aModType) MOZ_OVERRIDE;

    45 #ifdef DEBUG

    46   virtual void Init(nsIContent*      aContent,

    47                     nsIFrame*        aParent,

    48                     nsIFrame*        aPrevInFlow) MOZ_OVERRIDE;

    49 #endif

    51   virtual void BuildDisplayList(nsDisplayListBuilder*   aBuilder,

    52                                 const nsRect&           aDirtyRect,

    53                                 const nsDisplayListSet& aLists) MOZ_OVERRIDE {}

    55   /**

    56    * Get the "type" of the frame

    57    *

    58    * @see nsGkAtoms::svgMaskFrame

    59    */

    60   virtual nsIAtom* GetType() const MOZ_OVERRIDE;

    62 #ifdef DEBUG_FRAME_DUMP

    63   virtual nsresult GetFrameName(nsAString& aResult) const MOZ_OVERRIDE

    64   {

    65     return MakeFrameName(NS_LITERAL_STRING("SVGMask"), aResult);

    66   }

    67 #endif

    69 private:

    70   // A helper class to allow us to paint masks safely. The helper

    71   // automatically sets and clears the mInUse flag on the mask frame

    72   // (to prevent nasty reference loops). It's easy to mess this up

    73   // and break things, so this helper makes the code far more robust.

    74   class MOZ_STACK_CLASS AutoMaskReferencer

    75   {

    76   public:

    77     AutoMaskReferencer(nsSVGMaskFrame *aFrame

    78                        MOZ_GUARD_OBJECT_NOTIFIER_PARAM)

    79        : mFrame(aFrame) {

    80       MOZ_GUARD_OBJECT_NOTIFIER_INIT;

    81       NS_ASSERTION(!mFrame->mInUse, "reference loop!");

    82       mFrame->mInUse = true;

    83     }

    84     ~AutoMaskReferencer() {

    85       mFrame->mInUse = false;

    86     }

    87   private:

    88     nsSVGMaskFrame *mFrame;

    89     MOZ_DECL_USE_GUARD_OBJECT_NOTIFIER

    90   };

    92   nsIFrame *mMaskParent;

    93   nsAutoPtr<gfxMatrix> mMaskParentMatrix;

    94   // recursion prevention flag

    95   bool mInUse;

    97   // nsSVGContainerFrame methods:

    98   virtual gfxMatrix GetCanvasTM(uint32_t aFor,

    99                                 nsIFrame* aTransformRoot = nullptr) MOZ_OVERRIDE;

   100 };

   102 #endif

The Tor Browser / file revision

layout/svg/nsSVGMaskFrame.h@97036ab72558

layout/svg/nsSVGMaskFrame.h