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61 lines
2.1 KiB
Plaintext
61 lines
2.1 KiB
Plaintext
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/* -*- Mode: C++; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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include LayersSurfaces;
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include protocol PGrallocBuffer;
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include protocol PImageBridge;
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namespace mozilla {
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namespace layers {
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/**
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* The PImageBridge protocol is used to allow isolated threads or processes to push
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* frames directly to the compositor thread/process without relying on the main
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* thread which might be too busy dealing with content script.
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*
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* PImageContainer is the sub protocol of PImageBridge that takes place on the
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* ImageContainer level. There is basically one pair ImageContainerChild/Parent
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* for each ImageContainer that uses the protocol. ImageContainerChild (content
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* side) is responsible for sending images to the ImageContainerParent (compositor
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* side) by using SendPublishImage. Once received on the content side, shared
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* images are stored in a global map (see ImageContainerParent.cpp) accessible to
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* the image layers. Once a shared image is not usefull to the compositor anymore,
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* it is sent back to the child side (ReturnImage).
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*/
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sync protocol PImageContainer
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{
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manager PImageBridge;
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manages PGrallocBuffer;
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child:
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// Give back the child thread/process ownership to a SharedImage
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async ReturnImage(SharedImage image);
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parent:
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sync PGrallocBuffer(gfxIntSize size, gfxContentType content)
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returns (MaybeMagicGrallocBufferHandle handle);
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// Send a SharedImage to the compositor giving to the compositor ownership
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// of the image.
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async PublishImage(SharedImage image);
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// Tells the parent side to dispose of its shared images (most likely because the
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// video element is still alive but will not be displayed for a moment).
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async Flush();
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// After receiving this message, the ImageContainerParent will not return images
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// back to the child side (to avoid a race between ReturnImage and __delete__)
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sync Stop();
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sync __delete__();
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};
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} // namespace
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} // namespace
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