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139 lines
4.6 KiB
C++
139 lines
4.6 KiB
C++
/* -*- 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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#ifndef MOZILLA_GFX_IMAGECONTAINERPARENT_H
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#define MOZILLA_GFX_IMAGECONTAINERPARENT_H
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#include "mozilla/layers/PImageContainerParent.h"
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namespace mozilla {
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namespace layers {
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class ImageBridgeParent;
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/**
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* Handles reception of SharedImages on the compositor side.
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*
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* Received SharedImages are stored in a global map that can be accessed
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* from the compositor thread only.
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* This way, ShadowImageLayers can access SharedImages using the image's ID
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* without holding a reference to the ImageContainerParent.
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* The ID is passed to the ShadowImageLayer through a regular PCompositor
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* transaction.
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* All ImageContainerParent's method must be called from the Compositor thread
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* only.
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*/
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class ImageContainerParent : public PImageContainerParent
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{
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public:
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ImageContainerParent(ImageBridgeParent* aBridge, PRUint32 aContainerID);
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~ImageContainerParent();
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// Overriden from PImageContainerParent (see ImageContainer.ipdl)
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bool RecvPublishImage(const SharedImage& aImage) MOZ_OVERRIDE;
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// Overriden from PImageContainerParent (see DoStop)
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bool RecvStop() MOZ_OVERRIDE;
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// Overriden from PImageContainerParent (see ImageContainer.ipdl)
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bool Recv__delete__() MOZ_OVERRIDE;
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// Overriden from PImageContainerParent (see ImageContainer.ipdl)
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bool RecvFlush() MOZ_OVERRIDE;
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/**
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* Called by RecvStop and ImageBridgeChild::RecvStop.
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*
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* puts the ImageContainerChild in a state in which it cannot send async
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* messages to the child side, in order to not race with the upcomming
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* __delete__ message.
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*/
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void DoStop();
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static SharedImage* GetSharedImage(PRUint64 aID);
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/**
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* Every time a SharedImage is swaped, a version counter associated with the
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* iamge's ID is incremented. This allows ImageLayers to compare the current
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* image with the one that has been displayed last (in particular on OGL
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* backend we can avoid uploading the same texture twice if composition
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* happens more frequently than ImageBridge transfers);
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*/
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static PRUint32 GetSharedImageVersion(PRUint64 aID);
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/**
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* Returns true if this ID exists in the global SharedImage table.
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*
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* Should be called from the Compositor thread
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*/
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static bool IsExistingID(PRUint64 aID);
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/**
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* Associates an image with a compositor ID, so that when the ImageContainerParent
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* receives an image with a given ID, it can lookup the right compositor and
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* ask it to recomposite.
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*
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* This should be called by the ShadowImageLayer each time it renders a shared
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* image, to make sure the compositor ID is updated if the image stream changes
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* compositor (for instance when the tab containing the stream is dragged to
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* another window).
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*/
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static bool SetCompositorIDForImage(PRUint64 aImageID, PRUint64 aCompositorID);
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/**
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* Must be called on the compositor thread.
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*/
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static PRUint64 GetCompositorIDForImage(PRUint64 aImageID);
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/**
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* Must be called before the first use of ImageBridge and Compositor.
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*/
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static void CreateSharedImageMap();
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/**
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* Must be called after the last use of ImageBridge and Compositor.
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*/
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static void DestroySharedImageMap();
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protected:
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virtual PGrallocBufferParent*
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AllocPGrallocBuffer(const gfxIntSize&, const gfxContentType&,
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MaybeMagicGrallocBufferHandle*) MOZ_OVERRIDE
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{ return nsnull; }
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virtual bool
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DeallocPGrallocBuffer(PGrallocBufferParent* actor) MOZ_OVERRIDE
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{ return false; }
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/**
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* Sets the image associated with t aID in the global SharedImage table and
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* returns the previous image that was associated with aID.
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*
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* If the global SharedImage table does not yet have an entry for aID, it
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* creates one and returns nsnull since there was no previous image for aID.
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* Must be called from the Compositor thread.
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*/
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static SharedImage* SwapSharedImage(PRUint64 aID, SharedImage* aImage);
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/**
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* Removes an entry from the global SharedImage table and returns the
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* SharedImage that was stored in the table for aID or nsnull if there
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* was no entry for aID.
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*
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* It is safe to call this function on an ID that does not exist in the table.
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* Must be called from the Compositor thread.
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*/
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static SharedImage* RemoveSharedImage(PRUint64 aID);
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private:
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PRUint64 mID;
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ImageBridgeParent* mBridge;
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bool mStop;
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};
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} // namespace
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} // namespace
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#endif
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