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Initial version

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Works for the pixelfoo apps.

Limitations:
- Resizing the window is buggy.
- The frame rate argument has no effect.
- The update and render event logic should be reworked.
- Supports only single file executables, not interpreters with args
  (e.g. running an app as "python3 app.py" is not supported)
- Supports only RGB, not RGBW (yet)
This commit is contained in:
Juergen Stuber 2023-04-10 22:51:47 +02:00
commit ed8abb74e6
8 changed files with 2298 additions and 0 deletions
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# Change Log
## [Unreleased] - [unreleased]
### Breaking Changes
### Additions
### Changes
### Fixes
### Thanks

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[package]
name = "pixelfoo-viewer"
version = "0.1.0"
authors = ["Juergen Stuber <juergen@jstuber.net>"]
description = "Viewer for pixelfoo frame streams."
license = "MIT OR Apache-2.0"
edition = "2021"
[dependencies]
piston = "0.53.2"
piston2d-graphics = "0.43.0"
piston2d-opengl_graphics = "0.82.0"
piston_window = "0.128.0"
pistoncore-glutin_window = "0.71.0"
[dependencies.clap]
version = "4.2.1"
default-features = false
features = ["std", "help", "usage", "suggestions", "error-context", "derive"]

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Copyright © 2018 Jürgen Stuber
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# pixelfoo-viewer
> A viewer for pixelfoo frame streams.
## License
Licensed under either of
- Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
http://www.apache.org/licenses/LICENSE-2.0)
- MIT license ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
at your option.
### Contribution
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
dual licensed as above, without any additional terms or conditions.

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use std::error;
use std::io::Read;
use std::path;
use std::process;
use clap::Parser;
use piston::EventLoop;
use piston::EventSettings;
use piston::Events;
use piston::RenderEvent;
use piston_window as pw;
use piston_window::PistonWindow;
use piston_window::WindowSettings;
#[derive(Debug, Parser)]
#[command(author, version, about, long_about = None)]
struct Cli {
/// Executable to run
executable: path::PathBuf,
/// Number of pixels in a row
cols: usize,
/// Number of rows in a frame
rows: usize,
/// Free-format argument to pass to the executable
arg: String,
/// Frame rate for displaying
#[arg(short, long, default_value_t = 25)]
frame_rate: u64,
/// Turn debugging information on
#[arg(short, long, action = clap::ArgAction::Count)]
debug: u8,
}
fn main() -> Result<(), Box<dyn error::Error>> {
let cli = Cli::parse();
if cli.debug >= 2 {
eprintln!("CLI: {:?}", cli);
}
let mut child = process::Command::new(&cli.executable)
.arg(cli.cols.to_string())
.arg(cli.rows.to_string())
.arg(cli.arg)
.stdout(process::Stdio::piped())
.spawn()?;
if cli.debug >= 1 {
eprintln!(
"Running {} as a child process with pid {}",
cli.executable.display(),
child.id()
);
}
let mut stdout = child
.stdout
.take()
.ok_or("opening child process stdout failed")?;
// TODO support also RGBW
let colors = 3;
// TODO check for overflow and excessive size
let buffer_size = cli.cols * cli.rows * colors;
let mut buffer = vec![0_u8; buffer_size];
let mut frame_count = 0;
let mut window: PistonWindow = WindowSettings::new(
format!("pixelfoo-viewer {}", cli.executable.display()),
[1600, 800],
)
.exit_on_esc(true)
.build()?;
let mut events = Events::new(EventSettings::new().ups(cli.frame_rate));
let x_size = cli.cols;
let y_size = cli.rows;
while let Some(event) = events.next(&mut window) {
if let Some(args) = event.render_args() {
window.draw_2d(&event, |context, graphics, _device| {
// let [vsx, vsy] = context.get_view_size();
let [vsx, vsy] = args.viewport().window_size;
// Compute cell size
let csx = vsx / (x_size as f64);
let csy = vsy / (y_size as f64);
let cs = csx.min(csy);
pw::clear([0.0, 0.0, 0.0, 1.0], graphics);
stdout.read_exact(&mut buffer).expect("pipe read failed");
if cli.debug >= 3 {
eprintln!("Received frame {}", frame_count);
}
for y in 0..y_size {
for x in 0..x_size {
let i = colors * (y * x_size + x);
let r = f32::from(buffer[i + 0]) / 255.0;
let g = f32::from(buffer[i + 1]) / 255.0;
let b = f32::from(buffer[i + 2]) / 255.0;
let color = [r, g, b, 1.0];
let rectangle = [(x as f64) * cs, (y as f64) * cs, cs, cs];
pw::rectangle(color, rectangle, context.transform, graphics);
}
}
});
}
frame_count += 1;
}
child.kill()?;
Ok(())
}