Trait HostMemTraitConst

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pub trait HostMemTraitConst {
Show 24 methods    // Required method
    fn as_raw_HostMem(&self) -> *const c_void;

    // Provided methods
    fn flags(&self) -> i32 { ... }
    fn rows(&self) -> i32 { ... }
    fn cols(&self) -> i32 { ... }
    fn step(&self) -> size_t { ... }
    fn data(&self) -> *const u8 { ... }
    fn refcount(&self) -> *const i32 { ... }
    fn datastart(&self) -> *const u8 { ... }
    fn dataend(&self) -> *const u8 { ... }
    fn alloc_type(&self) -> HostMem_AllocType { ... }
    fn try_clone(&self) -> Result<HostMem> { ... }
    fn reshape(&self, cn: i32, rows: i32) -> Result<HostMem> { ... }
    fn reshape_def(&self, cn: i32) -> Result<HostMem> { ... }
    fn create_mat_header(&self) -> Result<Mat> { ... }
    fn create_gpu_mat_header(&self) -> Result<GpuMat> { ... }
    fn is_continuous(&self) -> Result<bool> { ... }
    fn elem_size(&self) -> Result<size_t> { ... }
    fn elem_size1(&self) -> Result<size_t> { ... }
    fn typ(&self) -> Result<i32> { ... }
    fn depth(&self) -> Result<i32> { ... }
    fn channels(&self) -> Result<i32> { ... }
    fn step1(&self) -> Result<size_t> { ... }
    fn size(&self) -> Result<Size> { ... }
    fn empty(&self) -> Result<bool> { ... }
}

Expand description

Constant methods for core::HostMem

Required Methods§

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fn as_raw_HostMem(&self) -> *const c_void

Provided Methods§

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fn try_clone(&self) -> Result<HostMem>

returns deep copy of the matrix, i.e. the data is copied

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fn reshape(&self, cn: i32, rows: i32) -> Result<HostMem>

creates alternative HostMem header for the same data, with different number of channels and/or different number of rows

§C++ default parameters

rows: 0

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fn reshape_def(&self, cn: i32) -> Result<HostMem>

creates alternative HostMem header for the same data, with different number of channels and/or different number of rows

§Note

This alternative version of HostMemTraitConst::reshape function uses the following default values for its arguments:

rows: 0

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fn create_mat_header(&self) -> Result<Mat>

returns matrix header with disabled reference counting for HostMem data.

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fn create_gpu_mat_header(&self) -> Result<GpuMat>

Maps CPU memory to GPU address space and creates the cuda::GpuMat header without reference counting for it.

This can be done only if memory was allocated with the SHARED flag and if it is supported by the hardware. Laptops often share video and CPU memory, so address spaces can be mapped, which eliminates an extra copy.

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