Method new

rustcv/src/core/mat.rs:18–28

(rows: i32, cols: i32, channels: u8)

impl Mat {
    pub fn new(rows: i32, cols: i32, channels: u8) -> Self {
        let step = (cols * channels as i32) as usize;
        let size = (rows as usize) * step;
        Self {
            data: vec![0; size],
            rows,
            cols,
            step,
            channels,
        }
    }

    /// 创建一个空的 Mat (通常用于作为输出 buffer)
    pub fn empty() -> Self {