beepy_display/
display.rs

1extern crate framebuffer;
2use embedded_graphics::{pixelcolor::BinaryColor, prelude::*};
3use framebuffer::{Framebuffer, FramebufferError};
4use std::path::PathBuf;
5use std::{fs::File, io::Write};
6use thiserror::Error;
7
8pub struct BeepyDisplay {
9    pub device: PathBuf,
10    fb: Framebuffer,
11    frame: Vec<u8>,
12}
13
14#[derive(Error, Debug)]
15pub enum BeepyDisplayError {
16    #[error(transparent)]
17    FramebufferError(#[from] FramebufferError),
18}
19
20impl BeepyDisplay {
21    pub fn new(device: PathBuf) -> Result<Self, BeepyDisplayError> {
22        let fb = Framebuffer::new(&device)?;
23        let frame = vec![0u8; 400 * 4 * 240 as usize];
24        //                                   ^ each pixel is 32 bit
25
26        Ok(Self { device, fb, frame })
27    }
28
29    pub fn flush(&mut self) {
30        self.fb.write_frame(&self.frame);
31    }
32}
33
34impl DrawTarget for BeepyDisplay {
35    type Color = BinaryColor;
36    type Error = core::convert::Infallible;
37
38    fn draw_iter<I>(&mut self, pixels: I) -> Result<(), Self::Error>
39    where
40        I: IntoIterator<Item = Pixel<Self::Color>>,
41    {
42        for Pixel(point, color) in pixels.into_iter() {
43            if let Ok((x @ 0..=399, y @ 0..=239)) = point.try_into() {
44                let index: u32 = x * 4 + y * 1600;
45                let c = if color.is_on() { 255 } else { 0 };
46
47                self.frame[(index + 0) as usize] = c; // blue
48                self.frame[(index + 1) as usize] = c; // green
49                self.frame[(index + 2) as usize] = c; // red
50                                                      // alpha is left alone
51            }
52        }
53
54        Ok(())
55    }
56}
57
58impl OriginDimensions for BeepyDisplay {
59    fn size(&self) -> Size {
60        Size::new(400, 240)
61    }
62}
63
64pub fn unbind_console() -> Result<(), std::io::Error> {
65    let mut file = File::create("/sys/class/vtconsole/vtcon1/bind")?;
66    file.write_all(b"0")
67}
68
69pub fn bind_console() -> Result<(), std::io::Error> {
70    let mut file = File::create("/sys/class/vtconsole/vtcon1/bind")?;
71    file.write_all(b"1")
72}
beepy_display/display.rs

beepy_display/
display.rs
