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Gralloc (Buffer ownership management (method (int (*lock)(...) (p0:…

- - - - Synchronization
        mechanism
        
        system level
        
        Not Safe enough
        
        low-level
        atomic
        
        read-lock
        
        many threads
        
        write-lock
        
        one tread only
  - - - p0: struct gralloc_module_t const* module
      - p1: buffer_handle_t handle
      - p2: int usage
      - p3 ~ 6: l, t, w, h
      - p7: void **vaddr
    - - fill buffer layout
        structure ycbcr
      - p7: struct android_ycbcr *ycbcr
- - - - p0: struct alloc_device_t* dev
      - p1 ~ 4: w, h, format, usage
      - p5: buffer_handle_t* handle
        (returned)
      - p6: int* stride
        (returned) (in unit of pixel)
      - Allocates a buffer
        in graphic memory
    - - GraphicBufferAllocator
  - - - p0: struct gralloc_module_t const* module
      - p1: buffer_handle_t handle
      - 註冊buffer_handle_t
        before can be used
      - 此 buffer_handle_t
        是尚未被(*alloc_device_t::alloc)() create
    - - p0: struct gralloc_module_t const* module
      - p1: buffer_handle_t handle
      - p2: int usage
      - p3 ~ 6: l, t, w, h
      - p7: void **vaddr
    - - fill buffer layout
        structure ycbcr
      - p7: struct android_ycbcr *ycbcr
    - - GraphicBufferMapper
- - - - YCbCr
        (image)
        
        YV12
        (planar)
        
        NV12
        (packed)(semi-planar)
      - RGB
        (graphics)