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Viewing changes to src/server/compositor/switching_bundle.h

  • Committer: Kevin DuBois
  • Date: 2013-11-05 21:44:14 UTC
  • mfrom: (1062.1.137 dev)
  • Revision ID: kevin.dubois@canonical.com-20131105214414-d32r52joqrs8tsmo
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src/server/compositor/switching_bundle.h
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class SwitchingBundle : public BufferBundle 
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{
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public:
 
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    enum {min_buffers = 1, max_buffers = 5};
 
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    SwitchingBundle(int nbuffers,
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                    const std::shared_ptr<graphics::GraphicBufferAllocator> &,
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                    const graphics::BufferProperties &);
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    void allow_framedropping(bool dropping_allowed);
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    bool framedropping_allowed() const;
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    /**
 
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     * Change the dimensions of the buffers contained in the bundle. For
 
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     * client_acquire, the change is guaranteed to be immediate. For
 
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     * compositors and snapshotters however, the change may be delayed by
 
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     * nbuffers frames while old frames of the old size are consumed.
 
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     */
 
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    void resize(const geometry::Size &newsize) override;
 
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private:
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    graphics::BufferProperties bundle_properties;
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    std::shared_ptr<graphics::GraphicBufferAllocator> gralloc;
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    const std::shared_ptr<graphics::Buffer> &alloc_buffer(int slot);
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    enum {MAX_NBUFFERS = 5};
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    struct SharedBuffer
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    {
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        std::shared_ptr<graphics::Buffer> buf;
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        int users = 0; // presently just a count of compositors sharing the buf
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    };
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    SharedBuffer ring[MAX_NBUFFERS];
 
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    SharedBuffer ring[max_buffers];
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    const int nbuffers;
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    int first_compositor;
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    int snapshot;
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    int nsnapshotters;
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    std::mutex guard;
 
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    mutable std::mutex guard;
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    std::condition_variable cond;
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    unsigned long last_consumed;