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Cargo.toml

+[package]
+name = "png_to_svg"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+anyhow = "1.0.65"
+clap = { version = "4.0.14", features = ["derive"] }
+env_logger = "0.9.1"
+image = { version = "0.24.4", default-features = false, features = ["png"] }
+log = "0.4.17"
+rayon = "1.5.3"
+thiserror = "1.0.37"

rustfmt.toml

+hard_tabs = true
+#group_imports = "StdExternalCrate"
+use_field_init_shorthand = true
+use_try_shorthand = true
\ No newline at end of file

src/cli.rs

+use clap::Parser;
+
+#[derive(Parser, Debug, Clone)]
+#[command(author, version, about, long_about = None)]
+pub struct Cli {
+	pub input_file: String,
+	pub output_file: String,
+	/// Set the size of each output pixel; creates an NxN rect for each input pixel where N is the scale
+	#[arg(short, long, default_value_t = 1)]
+	pub scale: usize,
+}

src/formatting.rs

+use std::fmt::{Display, Formatter};
+
+pub struct Attribute {
+	key: String,
+	value: String,
+}
+
+impl Display for Attribute {
+	fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
+		write!(f, "{}=\"{}\"", self.key, self.value.replace('"', "\\\""))
+	}
+}
+
+impl<A, B> From<(A, B)> for Attribute
+where
+	A: ToString,
+	B: ToString,
+{
+	fn from(item: (A, B)) -> Self {
+		Attribute {
+			key: item.0.to_string(),
+			value: item.1.to_string(),
+		}
+	}
+}
+
+fn format_attr_list(list: &[Attribute]) -> String {
+	list.iter()
+		.map(|attr| format!("{}", attr))
+		.reduce(|prev, cur| format!("{} {}", prev, cur))
+		.unwrap_or_default()
+}
+
+fn format_child_list(list: &[String]) -> String {
+	list.iter()
+		.fold(String::new(), |prev, cur| format!("{}\n{}", prev, cur))
+}
+
+pub struct El;
+
+impl El {
+	pub fn open(tag: impl ToString, attributes: &[Attribute]) -> String {
+		format!("<{} {}>", tag.to_string(), format_attr_list(attributes))
+	}
+
+	pub fn close(tag: impl ToString) -> String {
+		format!("</{}>", tag.to_string())
+	}
+
+	pub fn create(tag: impl ToString, attributes: &[Attribute]) -> String {
+		format!("<{} {} />", tag.to_string(), format_attr_list(attributes))
+	}
+
+	pub fn with_children(
+		tag: impl ToString,
+		attributes: Vec<Attribute>,
+		children: Vec<String>,
+	) -> String {
+		format!(
+			"<{tag} {attr}>{children}</{tag}>",
+			tag = tag.to_string(),
+			attr = format_attr_list(&attributes),
+			children = format_child_list(&children)
+		)
+	}
+}

src/lib.rs

+pub mod cli;
+pub mod formatting;
+pub mod output;

src/main.rs

+use clap::Parser;
+use png_to_svg::cli::Cli;
+use png_to_svg::formatting::El;
+use png_to_svg::output::create_output_canvas;
+use rayon::prelude::{ParallelBridge, ParallelIterator};
+
+fn to_opacity(value: u8) -> f32 {
+	value as f32 / 255.0
+}
+
+fn main() -> anyhow::Result<()> {
+	let args = Cli::parse();
+
+	println!("{:?}", args);
+
+	let input = image::open(args.input_file)?;
+	let input = input
+		.as_rgba8()
+		.ok_or_else(|| anyhow::Error::msg("Invalid input format"))?;
+
+	let (sender, thread_handle) = create_output_canvas(
+		input.width() as usize * args.scale,
+		input.height() as usize * args.scale,
+		args.output_file,
+	);
+
+	let pixel_width = input.width() as usize;
+	input
+		.pixels()
+		.into_iter()
+		.enumerate()
+		.map(move |(idx, pixel)| (idx, pixel, sender.clone()))
+		.par_bridge()
+		.for_each(move |(index, pixel, sender)| {
+			// Skip blank pixels
+			if pixel.0.iter().all(|val| *val == 0) {
+				return;
+			}
+			let (x, y) = (index % pixel_width, index / pixel_width);
+			let attributes = vec![
+				("width", format!("{}", args.scale)).into(),
+				("height", format!("{}", args.scale)).into(),
+				("x", format!("{}", x * args.scale)).into(),
+				("y", format!("{}", y * args.scale)).into(),
+				(
+					"fill",
+					format!("rgb({}, {}, {})", pixel.0[0], pixel.0[1], pixel.0[2]),
+				)
+					.into(),
+				("fill-opacity", format!("{}", to_opacity(pixel.0[3]))).into(),
+			];
+
+			let _ = sender.send(El::create("rect", attributes.as_slice()));
+		});
+
+	thread_handle
+		.join()
+		.map_err(|_| anyhow::Error::msg("The image writing thread failed, somehow"))??;
+
+	Ok(())
+}

src/output.rs

+use crate::formatting::El;
+use std::fs::File;
+use std::io::Write;
+use std::path::Path;
+use std::sync::mpsc::{RecvError, Sender, TryRecvError};
+use std::thread::{sleep, JoinHandle};
+use std::time::Duration;
+use std::{io, thread};
+
+type ThreadWriterResult = Result<(), ThreadWriterError>;
+
+pub struct ThreadWriter {
+	handle: JoinHandle<ThreadWriterResult>,
+}
+
+impl ThreadWriter {
+	pub fn join(self) -> thread::Result<ThreadWriterResult> {
+		self.handle.join()
+	}
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum ThreadWriterError {
+	#[error("There was an issue reading the incoming element: {0}")]
+	IncomingError(#[from] RecvError),
+	#[error("There was an issue opening the target file: {0}")]
+	OpenFileError(io::Error),
+	#[error("There was an issue writing to the target file: {0}")]
+	WriteFileError(io::Error),
+}
+
+fn write_error(e: io::Error) -> ThreadWriterError {
+	ThreadWriterError::WriteFileError(e)
+}
+
+pub fn create_output_canvas<T: AsRef<Path> + Send + 'static>(
+	width: usize,
+	height: usize,
+	path: T,
+) -> (Sender<String>, ThreadWriter) {
+	let (send, receiver) = std::sync::mpsc::channel::<String>();
+	let handle = thread::spawn(move || {
+		let mut file = File::create(path).map_err(write_error)?;
+
+		let container_attrs = vec![
+			("width", format!("{}", width)).into(),
+			("height", format!("{}", height)).into(),
+			("viewport", format!("0 0 {} {}", width, height)).into(),
+		];
+
+		file.write_all(El::open("svg", &container_attrs).as_bytes())
+			.map_err(write_error)?;
+		file.write_all("\n".as_bytes()).map_err(write_error)?;
+
+		loop {
+			match receiver.try_recv() {
+				Ok(value) => {
+					file.write_all(value.as_bytes()).map_err(write_error)?;
+					file.write_all("\n".as_bytes()).map_err(write_error)?;
+				}
+				Err(TryRecvError::Empty) => sleep(Duration::from_millis(5)),
+				Err(TryRecvError::Disconnected) => break,
+			}
+		}
+
+		file.write_all(El::close("svg").as_bytes())
+			.map_err(write_error)?;
+
+		Ok(())
+	});
+
+	(send, ThreadWriter { handle })
+}