Add methods to convert between HardwareBuffer and native handle.

        }

    }

    /// Creates a `HardwareBuffer` from a native handle.

    ///

    /// The native handle is cloned, so this doesn't take ownership of the original handle passed

    /// in.

    pub fn create_from_handle(

        handle: &NativeHandle,

        buffer_desc: &ffi::AHardwareBuffer_Desc,

    ) -> Result<Self, StatusCode> {

        let mut buffer = ptr::null_mut();

        // SAFETY: The caller guarantees that `handle` is valid, and the buffer pointer is valid

        // because it comes from a reference. The method we pass means that

        // `AHardwareBuffer_createFromHandle` will clone the handle rather than taking ownership of

        // it.

        let status = unsafe {

            ffi::AHardwareBuffer_createFromHandle(

                buffer_desc,

                handle.as_raw().as_ptr(),

                ffi::CreateFromHandleMethod_AHARDWAREBUFFER_CREATE_FROM_HANDLE_METHOD_CLONE

                    .try_into()

                    .unwrap(),

                &mut buffer,

            )

        };

        status_result(status)?;

        Ok(Self(NonNull::new(buffer).expect("Allocated AHardwareBuffer was null")))

    }

    /// Returns a clone of the native handle of the buffer.

    ///

    /// Returns `None` if the operation fails for any reason.

    pub fn cloned_native_handle(&self) -> Option<NativeHandle> {

        // SAFETY: The AHardwareBuffer pointer we pass is guaranteed to be non-null and valid

        // because it must have been allocated by `AHardwareBuffer_allocate`,

        // `AHardwareBuffer_readFromParcel` or the caller of `from_raw` and we have not yet

        // released it.

        let native_handle = unsafe { ffi::AHardwareBuffer_getNativeHandle(self.0.as_ptr()) };

        NonNull::new(native_handle.cast_mut()).and_then(|native_handle| {

            // SAFETY: `AHardwareBuffer_getNativeHandle` should have returned a valid pointer which

            // is valid at least as long as the buffer is, and `clone_from_raw` clones it rather

            // than taking ownership of it so the original `native_handle` isn't stored.

            unsafe { NativeHandle::clone_from_raw(native_handle) }

        })

    }

    /// Adopts the given raw pointer and wraps it in a Rust HardwareBuffer.

    ///

    /// # Safety

        assert_eq!(remade_buffer, buffer2);

    }

    #[test]

    fn native_handle_and_back() {

        let buffer = HardwareBuffer::new(

            1024,

            512,

            1,

            AHardwareBuffer_Format::AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM,

            AHardwareBuffer_UsageFlags::AHARDWAREBUFFER_USAGE_CPU_READ_OFTEN,

        )

        .expect("Buffer with some basic parameters was not created successfully");

        let native_handle =

            buffer.cloned_native_handle().expect("Failed to get native handle for buffer");

        let buffer_desc = ffi::AHardwareBuffer_Desc {

            width: 1024,

            height: 512,

            layers: 1,

            format: AHardwareBuffer_Format::AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM,

            usage: AHardwareBuffer_UsageFlags::AHARDWAREBUFFER_USAGE_CPU_READ_OFTEN.0,

            stride: 1024,

            rfu0: 0,

            rfu1: 0,

        };

        let buffer2 = HardwareBuffer::create_from_handle(&native_handle, &buffer_desc)

            .expect("Failed to create buffer from native handle");

        assert_eq!(buffer.description(), buffer_desc);

        assert_eq!(buffer2.description(), buffer_desc);

    }

}

#include <android/native_window.h>

#include <android/native_window_aidl.h>

#include <cutils/native_handle.h>

#include <vndk/hardware_buffer.h>