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// Copyright 2020 The ChromiumOS Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
use base::AsRawDescriptor;
use base::Event;
use base::RawDescriptor;
use base::VolatileSlice;
use vm_control::gpu::DisplayParameters;
use crate::DisplayT;
use crate::GpuDisplayError;
use crate::GpuDisplayFramebuffer;
use crate::GpuDisplayResult;
use crate::GpuDisplaySurface;
use crate::SurfaceType;
use crate::SysDisplayT;
#[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 {
(self.bytes_per_pixel as usize) * (self.width as usize)
}
fn bytes_per_pixel(&self) -> usize {
self.bytes_per_pixel as usize
}
}
struct StubSurface {
width: u32,
height: u32,
buffer: Option<Buffer>,
}
impl StubSurface {
/// 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()
}
}
impl GpuDisplaySurface for StubSurface {
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,
))
}
}
impl Drop for StubSurface {
fn drop(&mut self) {}
}
pub struct DisplayStub {
/// This event is never triggered and is used solely to fulfill AsRawDescriptor.
event: Event,
}
impl DisplayStub {
pub fn new() -> GpuDisplayResult<DisplayStub> {
let event = Event::new().map_err(|_| GpuDisplayError::CreateEvent)?;
Ok(DisplayStub { event })
}
}
impl DisplayT for DisplayStub {
fn create_surface(
&mut self,
parent_surface_id: Option<u32>,
_surface_id: u32,
_scanout_id: Option<u32>,
display_params: &DisplayParameters,
_surf_type: SurfaceType,
) -> GpuDisplayResult<Box<dyn GpuDisplaySurface>> {
if parent_surface_id.is_some() {
return Err(GpuDisplayError::Unsupported);
}
let (width, height) = display_params.get_virtual_display_size();
Ok(Box::new(StubSurface {
width,
height,
buffer: None,
}))
}
}
impl SysDisplayT for DisplayStub {}
impl AsRawDescriptor for DisplayStub {
fn as_raw_descriptor(&self) -> RawDescriptor {
self.event.as_raw_descriptor()
}
}
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