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Commit f0c53d6e authored by Fabien Sanglard's avatar Fabien Sanglard
Browse files

[SurfaceFlinger] Document layerStack 

Test: None, these are only comments.
Change-Id: Id5d45a5847d253bf92263091e5b322a1577fabe1
parent d07fc91a

services/surfaceflinger/DisplayDevice.h

+4 −0
Original line number Original line Diff line number Diff line
@@ -242,7 +242,11 @@ private: 
    static status_t orientationToTransfrom(int orientation,

    static status_t orientationToTransfrom(int orientation,

            int w, int h, Transform* tr);

            int w, int h, Transform* tr);





    // The identifier of the active layer stack for this display. Several displays

    // can use the same layer stack: A z-ordered group of layers (sometimes called

    // "surfaces"). Any given layer can only be on a single layer stack.

    uint32_t mLayerStack;

    uint32_t mLayerStack;



    int mOrientation;

    int mOrientation;

    static uint32_t sPrimaryDisplayOrientation;

    static uint32_t sPrimaryDisplayOrientation;

    // user-provided visible area of the layer stack

    // user-provided visible area of the layer stack

services/surfaceflinger/Layer.h

+12 −0
Original line number Original line Diff line number Diff line
@@ -109,7 +109,14 @@ public: 
        Geometry active;

        Geometry active;

        Geometry requested;

        Geometry requested;

        int32_t z;

        int32_t z;



        // The identifier of the layer stack this layer belongs to. A layer can

        // only be associated to a single layer stack. A layer stack is a

        // z-ordered group of layers which can be associated to one or more

        // displays. Using the same layer stack on different displays is a way

        // to achieve mirroring.

        uint32_t layerStack;

        uint32_t layerStack;



#ifdef USE_HWC2

#ifdef USE_HWC2

        float alpha;

        float alpha;

#else

#else
@@ -697,6 +704,11 @@ private: 
        Rect displayFrame;

        Rect displayFrame;

        FloatRect sourceCrop;

        FloatRect sourceCrop;

    };

    };



    // A layer can be attached to multiple displays when operating in mirror mode

    // (a.k.a: when several displays are attached with equal layerStack). In this

    // case we need to keep track. In non-mirror mode, a layer will have only one.

    // HWCInfo. This map key is a display layerStack.

    std::unordered_map<int32_t, HWCInfo> mHwcLayers;

    std::unordered_map<int32_t, HWCInfo> mHwcLayers;





    // We need one HWComposerBufferCache for each HWC display.  We cannot have

    // We need one HWComposerBufferCache for each HWC display.  We cannot have