Function mat_to_u32_buffer

rustcv/src/highgui/mod.rs:125–141

--- 内部辅助函数 (保持不变) ---

(mat: &Mat)

// --- 内部辅助函数 (保持不变) ---
fn mat_to_u32_buffer(mat: &Mat) -> Result<Vec<u32>> {
    let pixel_count = (mat.rows * mat.cols) as usize;
    // 提前分配并初始化，避免 debug 模式下的 capacity/push 检查开销
    let mut buffer = vec![0u32; pixel_count];

    // 使用 chunks_exact 配合 zip，编译器会自动进行 SIMD 展开和去边界检查
    for (src_chunk, dst_pixel) in mat.data.chunks_exact(3).zip(buffer.iter_mut()) {
        let b = src_chunk[0] as u32;
        let g = src_chunk[1] as u32;
        let r = src_chunk[2] as u32;

        // Pack: 00 | R | G | B
        *dst_pixel = (r << 16) | (g << 8) | b;
    }

    Ok(buffer)
}