The Tor Browser: gfx/2d/ImageScaling.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: 20; 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 _MOZILLA_GFX_IMAGESCALING_H

     7 #define _MOZILLA_GFX_IMAGESCALING_H

     9 #include "Types.h"

    11 #include <vector>

    12 #include "Point.h"

    14 namespace mozilla {

    15 namespace gfx {

    17 class ImageHalfScaler

    18 {

    19 public:

    20   ImageHalfScaler(uint8_t *aData, int32_t aStride, const IntSize &aSize)

    21     : mOrigData(aData), mOrigStride(aStride), mOrigSize(aSize)

    22     , mDataStorage(nullptr)

    23   {

    24   }

    26   ~ImageHalfScaler()

    27   {

    28     delete [] mDataStorage;

    29   }

    31   void ScaleForSize(const IntSize &aSize);

    33   uint8_t *GetScaledData() const { return mData; }

    34   IntSize GetSize() const { return mSize; }

    35   uint32_t GetStride() const { return mStride; }

    37 private:

    38   void HalfImage2D(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    39                    uint8_t *aDest, uint32_t aDestStride);

    40   void HalfImageVertical(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    41                          uint8_t *aDest, uint32_t aDestStride);

    42   void HalfImageHorizontal(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    43                            uint8_t *aDest, uint32_t aDestStride);

    45   // This is our SSE2 scaling function. Our destination must always be 16-byte

    46   // aligned and use a 16-byte aligned stride.

    47   void HalfImage2D_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    48                         uint8_t *aDest, uint32_t aDestStride);

    49   void HalfImageVertical_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    50                               uint8_t *aDest, uint32_t aDestStride);

    51   void HalfImageHorizontal_SSE2(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    52                                 uint8_t *aDest, uint32_t aDestStride);

    54   void HalfImage2D_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    55                      uint8_t *aDest, uint32_t aDestStride);

    56   void HalfImageVertical_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    57                            uint8_t *aDest, uint32_t aDestStride);

    58   void HalfImageHorizontal_C(uint8_t *aSource, int32_t aSourceStride, const IntSize &aSourceSize,

    59                              uint8_t *aDest, uint32_t aDestStride);

    61   uint8_t *mOrigData;

    62   int32_t mOrigStride;

    63   IntSize mOrigSize;

    65   uint8_t *mDataStorage;

    66   // Guaranteed 16-byte aligned

    67   uint8_t *mData;

    68   IntSize mSize;

    69   // Guaranteed 16-byte aligned

    70   uint32_t mStride;

    71 };

    73 }

    74 }

    76 #endif

The Tor Browser / file revision

gfx/2d/ImageScaling.h@97036ab72558

gfx/2d/ImageScaling.h