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// Copyright (C) 2023 The Android Open Source Project
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//! Wrapper around the HardwareBuffer
use nativewindow::*;
use super::{buffer_owner::NoBufferOwner, BufferOwner};
/// A wrapper for a hardware buffer.
///
/// This buffer may be associated with a buffer pool to which it will be returned to it when dropped.
pub struct Buffer {
buffer_owner: Box<dyn BufferOwner>,
hardware_buffer: HardwareBuffer,
}
impl Buffer {
/// Create new buffer with a custom [BufferOwner].
pub fn new(buffer_owner: Box<dyn BufferOwner>, hardware_buffer: HardwareBuffer) -> Self {
Self { buffer_owner, hardware_buffer }
}
/// Create a new buffer with no association to any buffer pool.
pub fn new_unowned(hardware_buffer: HardwareBuffer) -> Self {
Self { buffer_owner: Box::new(NoBufferOwner), hardware_buffer }
}
/// Get the id of the underlying buffer.
pub fn id(&self) -> u64 {
self.hardware_buffer.id()
}
/// Get a reference to the underlying hardware buffer.
pub fn buffer(&self) -> &HardwareBuffer {
&self.hardware_buffer
}
}
impl Drop for Buffer {
fn drop(&mut self) {
self.buffer_owner.on_return(self);
}
}
#[cfg(test)]
mod test {
use super::*;
use crate::StreamConfig;
const STREAM_CONFIG: StreamConfig = StreamConfig {
width: 1,
height: 1,
layers: 1,
format: AHardwareBuffer_Format::AHARDWAREBUFFER_FORMAT_R8G8B8A8_UNORM,
usage: AHardwareBuffer_UsageFlags::AHARDWAREBUFFER_USAGE_CPU_READ_OFTEN,
stride: 0,
};
#[test]
fn test_get_buffer_id() {
let hardware_buffer = STREAM_CONFIG.create_hardware_buffer().unwrap();
let buffer_id = hardware_buffer.id();
let buffer = Buffer::new_unowned(hardware_buffer);
assert_eq!(buffer_id, buffer.id());
}
}
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