150 lines
3.2 KiB
Rust
150 lines
3.2 KiB
Rust
use crate::{LvError, LvResult};
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use core::mem;
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use core::ops::{Deref, DerefMut};
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use core::ptr::NonNull;
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/// Places `T` into LVGL memory.
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pub(crate) struct Box<T>(NonNull<T>);
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impl<T> Box<T> {
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pub fn new(inner: T) -> LvResult<Box<T>> {
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let size = mem::size_of::<T>();
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let inner = unsafe {
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let ptr = lvgl_sys::lv_mem_alloc(size as lvgl_sys::size_t) as *mut T;
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// LVGL should align the memory address for us!
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assert_eq!(
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ptr as usize % mem::align_of::<T>(),
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0,
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"Memory address not aligned!"
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);
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match NonNull::new(ptr) {
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Some(v) => {
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// Move `T` to LVGL managed memory
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// It will panic if LVGL memory is not aligned
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ptr.write(inner);
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Ok(v)
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}
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None => Err(LvError::LvOOMemory),
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}
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};
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Ok(Box(inner?))
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}
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pub fn into_raw(self) -> *mut T {
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let b = mem::ManuallyDrop::new(self);
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b.0.as_ptr()
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}
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}
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impl<T> Drop for Box<T> {
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fn drop(&mut self) {
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unsafe {
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lvgl_sys::lv_mem_free(self.0.as_ptr() as *const cty::c_void);
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}
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}
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}
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impl<T> DerefMut for Box<T> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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self.as_mut()
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}
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}
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impl<T> Deref for Box<T> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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unsafe { self.0.as_ref() }
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}
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}
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impl<T> AsMut<T> for Box<T> {
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fn as_mut(&mut self) -> &mut T {
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unsafe { self.0.as_mut() }
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}
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}
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#[cfg(test)]
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mod test {
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use super::*;
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use core::mem::MaybeUninit;
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fn init() {
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unsafe {
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lvgl_sys::lv_init();
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};
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}
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fn teardown() {
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unsafe {
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lvgl_sys::lv_deinit();
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}
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}
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#[test]
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fn place_value_in_lv_mem() {
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init();
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let v = Box::new(5).unwrap();
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drop(v);
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let v = Box::new(10).unwrap();
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drop(v);
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teardown();
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}
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#[test]
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fn place_complex_value_in_lv_mem() {
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init();
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#[repr(C)]
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#[derive(Debug)]
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struct Point {
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x: u64,
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y: i8,
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t: i32,
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disp: i32,
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}
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for i in 0..100 {
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let p = Point {
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x: i,
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y: 42,
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t: 0,
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disp: -100,
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};
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println!("{:?}", p);
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let mut b = Box::new(p).unwrap_or_else(|_| {
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print_mem_info();
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panic!("OOM");
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});
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println!("memory address is {:p}", b.as_mut());
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let point = b.as_mut();
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if point.x != i {
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print_mem_info();
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println!("{:?}", point);
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}
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assert_eq!(point.x, i);
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}
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teardown();
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}
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fn print_mem_info() {
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let mut info = MaybeUninit::uninit();
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unsafe {
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lvgl_sys::lv_mem_monitor(info.as_mut_ptr());
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}
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if !info.as_ptr().is_null() {
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let info = unsafe { info.assume_init() };
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println!("mem info: {:?}", info);
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}
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}
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}
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