The Tor Browser: image/src/FrameSequence.cpp@ac0c01689b40

Implement a real Private Browsing Mode condition by changing the API/ABI;
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 #include "FrameSequence.h"

     8 using namespace mozilla;

     9 using namespace mozilla::image;

    11 namespace mozilla {

    12 namespace image {

    14 FrameSequence::~FrameSequence()

    15 {

    16   ClearFrames();

    17 }

    19 const FrameDataPair&

    20 FrameSequence::GetFrame(uint32_t framenum) const

    21 {

    22   if (framenum >= mFrames.Length()) {

    23     static FrameDataPair empty;

    24     return empty;

    25   }

    27   return mFrames[framenum];

    28 }

    30 uint32_t

    31 FrameSequence::GetNumFrames() const

    32 {

    33   return mFrames.Length();

    34 }

    36 void

    37 FrameSequence::RemoveFrame(uint32_t framenum)

    38 {

    39   NS_ABORT_IF_FALSE(framenum < mFrames.Length(), "Deleting invalid frame!");

    41   mFrames.RemoveElementAt(framenum);

    42 }

    44 void

    45 FrameSequence::ClearFrames()

    46 {

    47   // Since FrameDataPair holds an nsAutoPtr to its frame, clearing the mFrames

    48   // array also deletes all the frames.

    49   mFrames.Clear();

    50 }

    52 void

    53 FrameSequence::InsertFrame(uint32_t framenum, imgFrame* aFrame)

    54 {

    55   NS_ABORT_IF_FALSE(framenum <= mFrames.Length(), "Inserting invalid frame!");

    56   mFrames.InsertElementAt(framenum, aFrame);

    57   if (GetNumFrames() > 1) {

    58     // If we're creating our second element, we now know we're animated.

    59     // Therefore, we need to lock the first frame too.

    60     if (GetNumFrames() == 2) {

    61       mFrames[0].LockAndGetData();

    62     }

    64     // Whenever we have more than one frame, we always lock *all* our frames

    65     // so we have all the image data pointers.

    66     mFrames[framenum].LockAndGetData();

    67   }

    68 }

    70 imgFrame*

    71 FrameSequence::SwapFrame(uint32_t framenum, imgFrame* aFrame)

    72 {

    73   NS_ABORT_IF_FALSE(framenum < mFrames.Length(), "Swapping invalid frame!");

    75   FrameDataPair ret;

    77   // Steal the imgFrame.

    78   if (framenum < mFrames.Length()) {

    79     ret = mFrames[framenum];

    80   }

    82   if (aFrame) {

    83     mFrames.ReplaceElementAt(framenum, aFrame);

    84   } else {

    85     mFrames.RemoveElementAt(framenum);

    86   }

    88   return ret.Forget();

    89 }

    91 size_t

    92 FrameSequence::SizeOfDecodedWithComputedFallbackIfHeap(gfxMemoryLocation aLocation,

    93                                                        MallocSizeOf aMallocSizeOf) const

    94 {

    95   size_t n = 0;

    96   for (uint32_t i = 0; i < mFrames.Length(); ++i) {

    97     imgFrame* frame = mFrames.SafeElementAt(i, FrameDataPair());

    98     NS_ABORT_IF_FALSE(frame, "Null frame in frame array!");

    99     n += frame->SizeOfExcludingThisWithComputedFallbackIfHeap(aLocation, aMallocSizeOf);

   100   }

   102   return n;

   103 }

   105 } // namespace image

   106 } // namespace mozilla

The Tor Browser / file revision

image/src/FrameSequence.cpp@ac0c01689b40

image/src/FrameSequence.cpp