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+ "linked-hash-map",
+]

Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "thyme"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+png = "*"
+cairo-rs = { version = "*", features = ["svg"] }
+pango = "*"
+pangocairo = "*"
+serde = { version = "*", features = ["derive"] }
+serde_yaml = "*"

src/main.rs

@@ -0,0 +1,149 @@
+use std::fs::File;
+
+use serde::Deserialize;
+
+#[derive(Deserialize, Debug)]
+struct ColorEntry {
+    color: (u8, u8, u8),
+    symbol: String,
+}
+
+#[derive(Deserialize, Debug)]
+struct Mapping(Vec<ColorEntry>);
+
+impl Mapping {
+    fn load(path: impl AsRef<std::path::Path>) -> Result<Mapping, Box<dyn std::error::Error>> {
+        Ok(serde_yaml::from_reader(File::open(path)?)?)
+    }
+
+    fn lookup(&self, color: (u8, u8, u8)) -> &str {
+        let found = self.0.iter().find(|entry| entry.color == color);
+        match found {
+            Some(entry) => &entry.symbol,
+            None => panic!("Unable to find entry for {:?}", color),
+        }
+    }
+}
+
+
+struct Image {
+    width: u32,
+    height: u32,
+    data: Vec<(u8, u8, u8)>,
+}
+
+impl Image {
+    fn load(path: impl AsRef<std::path::Path>) -> Result<Image, Box<dyn std::error::Error>> {
+        let decoder = png::Decoder::new(File::open(path)?);
+        let mut reader = decoder.read_info()?;
+        let mut buf = vec![0u8; reader.output_buffer_size()];
+        let info = reader.next_frame(buf.as_mut_slice())?;
+
+        let mut data = Vec::new();
+
+        let skip = match info.color_type {
+            png::ColorType::Rgb => 3,
+            png::ColorType::Rgba => 4,
+            other => panic!("Unhandled color type: {:?}", other),
+        };
+
+        let rs = buf.iter().step_by(skip);
+        let gs = buf.iter().skip(1).step_by(skip);
+        let bs = buf.iter().skip(2).step_by(skip);
+
+        for ((r, g), b) in rs.zip(gs).zip(bs) {
+            data.push((*r, *g, *b))
+        }
+
+        Ok(Image {
+            width: info.width,
+            height: info.height,
+            data
+        })
+    }
+}
+
+#[derive(Deserialize)]
+struct Config {
+    grid_every: u32,
+    line_weight: f64,
+    major_line_weight: f64,
+    grid_size: f64,
+}
+
+impl Config {
+    fn scale(&self, n: u32) -> f64 {
+        n as f64 * self.grid_size
+    }
+}
+
+impl Default for Config {
+    fn default() -> Config {
+        Config {
+            grid_every: 10,
+            line_weight: 1.0,
+            major_line_weight: 3.0,
+            grid_size: 24.0,
+        }
+    }
+}
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let img = Image::load("sample.png")?;
+    let mapping = Mapping::load("colors.yaml")?;
+    let mut x = 0;
+    let mut y = 0;
+
+    let config = Config::default();
+
+    let surf = cairo::SvgSurface::new(
+        config.scale(img.width),
+        config.scale(img.height),
+        Some("output.svg"),
+    )?;
+
+    let ctx = cairo::Context::new(&surf)?;
+    ctx.set_source_rgb(1.0, 1.0, 1.0);
+    ctx.paint()?;
+
+    let layout = pangocairo::functions::create_layout(&ctx).unwrap();
+    let font = pango::FontDescription::from_string("Fira Sans 12");
+    layout.set_width(2880);
+    layout.set_font_description(Some(&font));
+
+    ctx.set_source_rgb(0.0, 0.0, 0.0);
+    for i in 0..=img.width {
+        ctx.move_to(config.scale(i), 0.0);
+        ctx.line_to(config.scale(i), config.scale(img.height));
+        ctx.set_line_width(if i % config.grid_every == 0 { config.major_line_weight } else { config.line_weight });
+        ctx.stroke()?;
+    }
+    for j in 0..=img.height {
+        ctx.move_to(0.0, config.scale(j));
+        ctx.line_to(config.scale(img.width), config.scale(j));
+        ctx.set_line_width(if j % config.grid_every == 0 { config.major_line_weight } else { config.line_weight });
+        ctx.stroke()?;
+    }
+
+    ctx.set_source_rgb(0.0, 0.0, 0.0);
+
+    for (r, g, b) in img.data.iter() {
+        let l = mapping.lookup((*r, *g, *b));
+
+        x += 1;
+        if x == img.width {
+            x = 0;
+            y += 1;
+        }
+
+        if l != "" {
+            ctx.move_to(config.scale(x - 1) + 5.0, config.scale(y) + 3.0);
+            layout.set_text(l);
+            pangocairo::functions::show_layout(&ctx, &layout);
+        }
+    }
+
+    surf.finish();
+
+    Ok(())
+}