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// Copyright 2020 The Chromium OS Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use std::collections::BTreeMap;
use std::num::NonZeroU32;
use std::os::unix::io::{AsRawFd, RawFd};
use crate::{DisplayT, EventDevice, GpuDisplayError, GpuDisplayFramebuffer};
use data_model::VolatileSlice;
use sys_util::EventFd;
type SurfaceId = NonZeroU32;
#[allow(dead_code)]
struct Buffer {
width: u32,
height: u32,
bytes_per_pixel: u32,
bytes: Vec<u8>,
}
impl Drop for Buffer {
fn drop(&mut self) {}
}
impl Buffer {
fn as_volatile_slice(&mut self) -> VolatileSlice {
VolatileSlice::new(self.bytes.as_mut_slice())
}
fn stride(&self) -> usize {
return (self.bytes_per_pixel as usize) * (self.width as usize);
}
fn bytes_per_pixel(&self) -> usize {
return self.bytes_per_pixel as usize;
}
}
struct Surface {
width: u32,
height: u32,
buffer: Option<Buffer>,
}
impl Surface {
fn create(width: u32, height: u32) -> Result<Surface, GpuDisplayError> {
Ok(Surface {
width,
height,
buffer: None,
})
}
/// Gets the buffer at buffer_index, allocating it if necessary.
fn lazily_allocate_buffer(&mut self) -> Option<&mut Buffer> {
if self.buffer.is_none() {
// XRGB8888
let bytes_per_pixel = 4;
let bytes_total = (self.width as u64) * (self.height as u64) * (bytes_per_pixel as u64);
self.buffer = Some(Buffer {
width: self.width,
height: self.height,
bytes_per_pixel,
bytes: vec![0; bytes_total as usize],
});
}
self.buffer.as_mut()
}
/// Gets the next framebuffer, allocating if necessary.
fn framebuffer(&mut self) -> Option<GpuDisplayFramebuffer> {
let framebuffer = self.lazily_allocate_buffer()?;
let framebuffer_stride = framebuffer.stride() as u32;
let framebuffer_bytes_per_pixel = framebuffer.bytes_per_pixel() as u32;
Some(GpuDisplayFramebuffer::new(
framebuffer.as_volatile_slice(),
framebuffer_stride,
framebuffer_bytes_per_pixel,
))
}
fn flip(&mut self) {}
}
impl Drop for Surface {
fn drop(&mut self) {}
}
struct SurfacesHelper {
next_surface_id: SurfaceId,
surfaces: BTreeMap<SurfaceId, Surface>,
}
impl SurfacesHelper {
fn new() -> SurfacesHelper {
SurfacesHelper {
next_surface_id: SurfaceId::new(1).unwrap(),
surfaces: Default::default(),
}
}
fn create_surface(&mut self, width: u32, height: u32) -> Result<u32, GpuDisplayError> {
let new_surface = Surface::create(width, height)?;
let new_surface_id = self.next_surface_id;
self.surfaces.insert(new_surface_id, new_surface);
self.next_surface_id = SurfaceId::new(self.next_surface_id.get() + 1).unwrap();
Ok(new_surface_id.get())
}
fn get_surface(&mut self, surface_id: u32) -> Option<&mut Surface> {
SurfaceId::new(surface_id).and_then(move |id| self.surfaces.get_mut(&id))
}
fn destroy_surface(&mut self, surface_id: u32) {
SurfaceId::new(surface_id).and_then(|id| self.surfaces.remove(&id));
}
fn flip_surface(&mut self, surface_id: u32) {
if let Some(surface) = self.get_surface(surface_id) {
surface.flip();
}
}
}
pub struct DisplayStub {
/// This eventfd is never triggered and is used solely to fulfill AsRawFd.
eventfd: EventFd,
surfaces: SurfacesHelper,
}
impl DisplayStub {
pub fn new() -> Result<DisplayStub, GpuDisplayError> {
let eventfd = EventFd::new().map_err(|_| GpuDisplayError::CreateEventFd)?;
Ok(DisplayStub {
eventfd,
surfaces: SurfacesHelper::new(),
})
}
}
impl DisplayT for DisplayStub {
fn dispatch_events(&mut self) {}
fn create_surface(
&mut self,
parent_surface_id: Option<u32>,
width: u32,
height: u32,
) -> Result<u32, GpuDisplayError> {
if parent_surface_id.is_some() {
return Err(GpuDisplayError::Unsupported);
}
self.surfaces.create_surface(width, height)
}
fn release_surface(&mut self, surface_id: u32) {
self.surfaces.destroy_surface(surface_id);
}
fn framebuffer(&mut self, surface_id: u32) -> Option<GpuDisplayFramebuffer> {
self.surfaces
.get_surface(surface_id)
.and_then(|s| s.framebuffer())
}
fn next_buffer_in_use(&self, _surface_id: u32) -> bool {
false
}
fn flip(&mut self, surface_id: u32) {
self.surfaces.flip_surface(surface_id);
}
fn close_requested(&self, _surface_id: u32) -> bool {
false
}
fn import_dmabuf(
&mut self,
_fd: RawFd,
_offset: u32,
_stride: u32,
_modifiers: u64,
_width: u32,
_height: u32,
_fourcc: u32,
) -> Result<u32, GpuDisplayError> {
Err(GpuDisplayError::Unsupported)
}
fn release_import(&mut self, _import_id: u32) {
// unsupported
}
fn commit(&mut self, _surface_id: u32) {
// unsupported
}
fn flip_to(&mut self, _surface_id: u32, _import_id: u32) {
// unsupported
}
fn set_position(&mut self, _surface_id: u32, _x: u32, _y: u32) {
// unsupported
}
fn import_event_device(&mut self, _event_device: EventDevice) -> Result<u32, GpuDisplayError> {
Err(GpuDisplayError::Unsupported)
}
fn release_event_device(&mut self, _event_device_id: u32) {
// unsupported
}
fn attach_event_device(&mut self, _surface_id: u32, _event_device_id: u32) {
// unsupported
}
}
impl AsRawFd for DisplayStub {
fn as_raw_fd(&self) -> RawFd {
self.eventfd.as_raw_fd()
}
}
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