leaprs 0.2.2

Safe wrapper for the LeapC Ultraleap (Leap Motion) hand tracking device API.
Documentation 
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use std::ops::Deref;

use leap_sys::LEAP_POINT_MAPPING;

use crate::{sized_with_trailing_data::SizedWithTrailingData, LeapVectorRef};

/// # Fields
/// Available via dereference: [LEAP_POINT_MAPPING].
pub struct PointMapping {
    /// Store a boxed dynamic sized event
    /// The size is only known at runtime
    pub(crate) handle: Box<SizedWithTrailingData<LEAP_POINT_MAPPING>>,
}

impl Deref for PointMapping {
    type Target = LEAP_POINT_MAPPING;

    fn deref(&self) -> &Self::Target {
        &self.handle.sized
    }
}

impl PointMapping {
    /// Allocate a LEAP_POINT_MAPPING with more data contiguous to it.
    /// Unsafe: inner struct is uninitialized
    pub(crate) unsafe fn new_uninitialized(point_mapping_size: u64) -> Self {
        let trailing_size = point_mapping_size as usize - std::mem::size_of::<LEAP_POINT_MAPPING>();
        Self {
            handle: SizedWithTrailingData::allocate(std::mem::zeroed(), trailing_size),
        }
    }

    #[doc = " The 3D points being mapped. @since 4.0.0"]
    pub fn points(&self) -> Vec<LeapVectorRef> {
        unsafe {
            (0..self.handle.sized.nPoints as isize)
                .map(|i| &*self.handle.sized.pPoints.offset(i))
                .map(LeapVectorRef)
                .collect()
        }
    }

    #[doc = " The IDs of the 3D points being mapped. @since 4.0.0"]
    pub fn pids(&self) -> &[u32] {
        unsafe {
            std::slice::from_raw_parts(self.handle.sized.pIDs, self.handle.sized.nPoints as usize)
        }
    }
}