fn i420_rgb()

in src/convert_image/x86.rs [1053:1107]

• 43 lines of code
• 11 McCabe index (conditional complexity)

fn i420_rgb<const COLORIMETRY: usize, const DEPTH: usize, const REVERSED: bool>(
    width: u32,
    height: u32,
    _last_src_plane: usize,
    src_strides: &[usize],
    src_buffers: &[&[u8]],
    _last_dst_plane: usize,
    dst_strides: &[usize],
    dst_buffers: &mut [&mut [u8]],
) -> bool {
    // Degenerate case, trivially accept
    if width == 0 || height == 0 {
        return true;
    }

    // Check there are sufficient strides and buffers
    if src_strides.len() < 3
        || src_buffers.len() < 3
        || dst_strides.is_empty()
        || dst_buffers.is_empty()
    {
        return false;
    }

    // Check subsampling limits
    let w = width as usize;
    let h = height as usize;
    let cw = w / 2;
    let ch = h / 2;
    let rgb_stride = DEPTH * w;

    // Compute actual strides
    let src_strides = (
        compute_stride(src_strides[0], w),
        compute_stride(src_strides[1], cw),
        compute_stride(src_strides[2], cw),
    );
    let dst_stride = compute_stride(dst_strides[0], rgb_stride);

    // Ensure there is sufficient data in the buffers according
    // to the image dimensions and computed strides
    let src_buffers = (src_buffers[0], src_buffers[1], src_buffers[2]);
    let dst_buffer = &mut *dst_buffers[0];
    if out_of_bounds(src_buffers.0.len(), src_strides.0, h - 1, w)
        || out_of_bounds(src_buffers.1.len(), src_strides.1, ch - 1, cw)
        || out_of_bounds(src_buffers.2.len(), src_strides.2, ch - 1, cw)
        || out_of_bounds(dst_buffer.len(), dst_stride, h - 1, rgb_stride)
    {
        return false;
    }

    i420_to_bgra::<COLORIMETRY, REVERSED>(w, h, src_strides, src_buffers, dst_stride, dst_buffer);

    true
}