The Tor Browser: gfx/layers/ipc/PImageBridge.ipdl@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 LayersSurfaces;

     7 include LayersMessages;

     8 include protocol PGrallocBuffer;

     9 include protocol PCompositable;

    10 include protocol PTexture;

    11 include ProtocolTypes;

    13 include "mozilla/GfxMessageUtils.h";

    15 using struct mozilla::layers::TextureInfo from "mozilla/layers/CompositorTypes.h";

    17 namespace mozilla {

    18 namespace layers {

    20 /**

    21  * The PImageBridge protocol is used to allow isolated threads or processes to push

    22  * frames directly to the compositor thread/process without relying on the main thread

    23  * which might be too busy dealing with content script.

    24  */

    25 intr protocol PImageBridge

    26 {

    27   manages PCompositable;

    28   manages PGrallocBuffer;

    29   manages PTexture;

    31 parent:

    33   sync Update(CompositableOperation[] ops) returns (EditReply[] reply);

    34   async UpdateNoSwap(CompositableOperation[] ops);

    36   // Allocates a gralloc buffer that may not suitable to use with

    37   // gfxImageSurface but allows hardware decoder to write to the

    38   // buffer directly. The format is a enum defined in

    39   // system/graphics.h and the usage is the GraphicBuffer usage

    40   // flag. See GraphicBuffer.h and gralloc.h.

    41   sync PGrallocBuffer(IntSize size, uint32_t format, uint32_t usage)

    42     returns (MaybeMagicGrallocBufferHandle handle);

    44   // First step of the destruction sequence. This puts ImageBridge

    45   // in a state in which it can't send asynchronous messages

    46   // so as to not race with the upcomming Stop message and destruction.

    47   // In the child side, the Stop message is not sent right after WillStop,

    48   // it is scheduled in the ImageBridgeChild's message queue in order to ensure

    49   // that all of the messages from the parent side have been received and processed

    50   // before sending Stop, and that after Stop returns, there is no message in

    51   // flight on any side and we can safely destroy the channel and threads.

    52   sync WillStop();

    53   // Second step

    54   sync Stop();

    56   sync PCompositable(TextureInfo aInfo) returns (uint64_t id);

    57   async PTexture(SurfaceDescriptor aSharedData, uint32_t aTextureFlags);

    58 };

    61 } // namespace

    62 } // namespace

The Tor Browser / file revision

gfx/layers/ipc/PImageBridge.ipdl@97036ab72558

gfx/layers/ipc/PImageBridge.ipdl