The Tor Browser: gfx/layers/MacIOSurfaceImage.cpp@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 #include "MacIOSurfaceImage.h"

     7 #include "mozilla/layers/MacIOSurfaceTextureClientOGL.h"

     9 using namespace mozilla;

    10 using namespace mozilla::layers;

    12 TextureClient*

    13 MacIOSurfaceImage::GetTextureClient(CompositableClient* aClient)

    14 {

    15   if (!mTextureClient) {

    16     RefPtr<MacIOSurfaceTextureClientOGL> buffer =

    17       new MacIOSurfaceTextureClientOGL(TEXTURE_FLAGS_DEFAULT);

    18     buffer->InitWith(mSurface);

    19     mTextureClient = buffer;

    20   }

    21   return mTextureClient;

    22 }

    24 TemporaryRef<gfx::SourceSurface>

    25 MacIOSurfaceImage::GetAsSourceSurface()

    26 {

    27   mSurface->Lock();

    28   size_t bytesPerRow = mSurface->GetBytesPerRow();

    29   size_t ioWidth = mSurface->GetDevicePixelWidth();

    30   size_t ioHeight = mSurface->GetDevicePixelHeight();

    32   unsigned char* ioData = (unsigned char*)mSurface->GetBaseAddress();

    34   RefPtr<gfx::DataSourceSurface> dataSurface

    35     = gfx::Factory::CreateDataSourceSurface(gfx::IntSize(ioWidth, ioHeight), gfx::SurfaceFormat::B8G8R8A8);

    36   if (!dataSurface)

    37     return nullptr;

    39   gfx::DataSourceSurface::MappedSurface mappedSurface;

    40   if (!dataSurface->Map(gfx::DataSourceSurface::WRITE, &mappedSurface))

    41     return nullptr;

    43   for (size_t i = 0; i < ioHeight; ++i) {

    44     memcpy(mappedSurface.mData + i * mappedSurface.mStride,

    45            ioData + i * bytesPerRow,

    46            ioWidth * 4);

    47   }

    49   dataSurface->Unmap();

    50   mSurface->Unlock();

    52   return dataSurface;

    53 }

The Tor Browser / file revision

gfx/layers/MacIOSurfaceImage.cpp@97036ab72558

gfx/layers/MacIOSurfaceImage.cpp