opencv 0.46.2

Rust bindings for OpenCV
Documentation 
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use opencv::{
    core::{Rect, Size, UMat, UMatUsageFlags, Vec3d},
    prelude::*,
    Result,
    types::VectorOfi32,
};
#[cfg(not(feature = "opencv-4"))]
use opencv::core::ACCESS_READ;
#[cfg(feature = "opencv-4")]
use opencv::core::AccessFlag::ACCESS_READ;

#[test]
fn umat_default() -> Result<()> {
    let mat = UMat::new(UMatUsageFlags::USAGE_DEFAULT)?;
    assert_eq!(u8::typ(), mat.typ()?);
    assert_eq!(u8::depth(), mat.depth()?);
    assert_eq!(u8::channels(), mat.channels()?);
    assert_eq!(Size::new(0, 0), mat.size()?);
    assert_eq!(0, mat.dims());
    Ok(())
}

#[test]
fn umat_create() -> Result<()> {
    let mut mat = UMat::new(UMatUsageFlags::USAGE_DEFAULT)?;
    unsafe { mat.create_rows_cols(10, 10, u16::typ(), UMatUsageFlags::USAGE_DEFAULT)? };
    assert_eq!(Size::new(10, 10), mat.size()?);
    assert_eq!(2, mat.dims());
    Ok(())
}

#[test]
fn umat_to_mat() -> Result<()> {
    {
        let mut vec = VectorOfi32::new();
        vec.push(1);
        vec.push(2);
        vec.push(3);
        let umat = Mat::from_exact_iter(vec.into_iter())?.get_umat(ACCESS_READ, UMatUsageFlags::USAGE_DEFAULT)?;
        assert_eq!(3, umat.rows());
        assert_eq!(1, umat.cols());
        assert_eq!(i32::typ(), umat.typ()?);
        let mat = umat.get_mat(ACCESS_READ)?;
        assert_eq!(1, *mat.at_2d::<i32>(0, 0)?);
        assert_eq!(2, *mat.at_2d::<i32>(1, 0)?);
        assert_eq!(3, *mat.at_2d::<i32>(2, 0)?);
    }

    {
        let vec: Vec<i32> = vec![1, 2, 3];
        let umat = Mat::from_exact_iter(vec.into_iter())?.get_umat(ACCESS_READ, UMatUsageFlags::USAGE_DEFAULT)?;
        assert_eq!(3, umat.rows());
        assert_eq!(1, umat.cols());
        assert_eq!(i32::typ(), umat.typ()?);
        let mat = umat.get_mat(ACCESS_READ)?;
        assert_eq!(1, *mat.at_2d::<i32>(0, 0)?);
        assert_eq!(2, *mat.at_2d::<i32>(1, 0)?);
        assert_eq!(3, *mat.at_2d::<i32>(2, 0)?);
    }
    Ok(())
}

#[test]
fn umat_for_rows_and_cols() -> Result<()> {
    let mat = unsafe { UMat::new_rows_cols(400, 300, Vec3d::typ(), UMatUsageFlags::USAGE_DEFAULT) }?;
    assert_eq!(Vec3d::typ(), mat.typ()?);
    assert_eq!(Vec3d::depth(), mat.depth()?);
    assert_eq!(Vec3d::channels(), mat.channels()?);
    assert!(mat.is_continuous()?);
    assert!(!mat.is_submatrix()?);
    assert_eq!(Size::new(300, 400), mat.size()?);
    assert_eq!(400, mat.rows());
    assert_eq!(300, mat.cols());
    assert_eq!(2, mat.mat_size().len());
    assert_eq!(400, mat.mat_size()[0]);
    assert_eq!(300, mat.mat_size()[1]);
    assert_eq!(2, mat.dims());
    assert_eq!(2, mat.mat_step().len());
    assert_eq!(7200, mat.mat_step()[0]);
    assert_eq!(24, mat.mat_step()[1]);
    assert_eq!(24, mat.elem_size()?);
    assert_eq!(8, mat.elem_size1()?);
    assert_eq!(900, mat.step1(0)?);
    assert_eq!(3, mat.step1(1)?);
    assert_eq!(120000, mat.total()?);
    Ok(())
}

#[test]
fn umat_continuous() -> Result<()> {
    let s: Vec<Vec<f32>> = vec![
        vec![1., 2., 3.],
        vec![4., 5., 6.],
        vec![7., 8., 9.],
    ];

    let umat = Mat::from_slice_2d(&s)?.get_umat(ACCESS_READ, UMatUsageFlags::USAGE_DEFAULT)?;

    {
        let sub_umat_non_cont = UMat::roi(&umat, Rect::new(1, 1, 2, 2))?;
        assert_eq!(umat.typ()?, sub_umat_non_cont.typ()?);
        assert_eq!(2, sub_umat_non_cont.rows());
        assert_eq!(2, sub_umat_non_cont.cols());
        assert!(sub_umat_non_cont.is_submatrix()?);
        assert!(!sub_umat_non_cont.is_continuous()?);

        let umat_clone = sub_umat_non_cont.try_clone()?;
        assert_eq!(umat.typ()?, umat_clone.typ()?);
        assert_eq!(2, umat_clone.rows());
        assert_eq!(2, umat_clone.cols());
        assert!(!umat_clone.is_submatrix()?);
        assert!(umat_clone.is_continuous()?);
    }

    {
        let sub_umat_cont = UMat::roi(&umat, Rect::new(0, 1, 3, 2))?;
        assert_eq!(umat.typ()?, sub_umat_cont.typ()?);
        assert_eq!(2, sub_umat_cont.rows());
        assert_eq!(3, sub_umat_cont.cols());
        assert!(sub_umat_cont.is_submatrix()?);
        assert!(sub_umat_cont.is_continuous()?);
    }

    Ok(())
}