Vendor things

third-party/vendor/ttf-parser-0.15.2/examples/font-info.rs

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+fn main() {
+    let args: Vec<_> = std::env::args().collect();
+    if args.len() != 2 {
+        println!("Usage:\n\tfont-info font.ttf");
+        std::process::exit(1);
+    }
+
+    let font_data = std::fs::read(&args[1]).unwrap();
+
+    let now = std::time::Instant::now();
+
+    let face = match ttf_parser::Face::from_slice(&font_data, 0) {
+        Ok(f) => f,
+        Err(e) => {
+            eprint!("Error: {}.", e);
+            std::process::exit(1);
+        },
+    };
+
+    let family_name = face.names().into_iter()
+        .find(|name| name.name_id == ttf_parser::name_id::FULL_NAME && name.is_unicode())
+        .and_then(|name| name.to_string());
+
+    let post_script_name = face.names().into_iter()
+        .find(|name| name.name_id == ttf_parser::name_id::POST_SCRIPT_NAME && name.is_unicode())
+        .and_then(|name| name.to_string());
+
+    println!("Family name: {:?}", family_name);
+    println!("PostScript name: {:?}", post_script_name);
+    println!("Units per EM: {:?}", face.units_per_em());
+    println!("Ascender: {}", face.ascender());
+    println!("Descender: {}", face.descender());
+    println!("Line gap: {}", face.line_gap());
+    println!("Global bbox: {:?}", face.global_bounding_box());
+    println!("Number of glyphs: {}", face.number_of_glyphs());
+    println!("Underline: {:?}", face.underline_metrics());
+    println!("X height: {:?}", face.x_height());
+    println!("Weight: {:?}", face.weight());
+    println!("Width: {:?}", face.width());
+    println!("Regular: {}", face.is_regular());
+    println!("Italic: {}", face.is_italic());
+    println!("Bold: {}", face.is_bold());
+    println!("Oblique: {}", face.is_oblique());
+    println!("Strikeout: {:?}", face.strikeout_metrics());
+    println!("Subscript: {:?}", face.subscript_metrics());
+    println!("Superscript: {:?}", face.superscript_metrics());
+    println!("Variable: {:?}", face.is_variable());
+
+    #[cfg(feature = "opentype-layout")] {
+        if let Some(ref table) = face.tables().gpos {
+            print_opentype_layout("positioning", table);
+        }
+
+        if let Some(ref table) = face.tables().gsub {
+            print_opentype_layout("substitution", table);
+        }
+    }
+
+    #[cfg(feature = "variable-fonts")] {
+        if face.is_variable() {
+            println!("Variation axes:");
+            for axis in face.variation_axes() {
+                println!("  {} {}..{}, default {}",
+                         axis.tag, axis.min_value, axis.max_value, axis.def_value);
+            }
+        }
+    }
+
+    println!("Elapsed: {}us", now.elapsed().as_micros());
+}
+
+fn print_opentype_layout(name: &str, table: &ttf_parser::opentype_layout::LayoutTable) {
+    println!("OpenType {}:", name);
+    println!("  Scripts:");
+    for script in table.scripts {
+        println!("    {}", script.tag);
+
+        if script.languages.is_empty() {
+            println!("      No languages");
+            continue;
+        }
+
+        println!("      Languages:");
+        for lang in script.languages {
+            println!("        {}", lang.tag);
+        }
+    }
+
+    let mut features: Vec<_> = table.features.into_iter().map(|f| f.tag).collect();
+    features.dedup();
+    println!("  Features:");
+    for feature in features {
+        println!("    {}", feature);
+    }
+}

third-party/vendor/ttf-parser-0.15.2/examples/font2svg.rs

@@ -0,0 +1,292 @@
+use std::path::PathBuf;
+use std::io::Write;
+
+use ttf_parser as ttf;
+
+const FONT_SIZE: f64 = 128.0;
+const COLUMNS: u32 = 100;
+
+const HELP: &str = "\
+Usage:
+    font2svg font.ttf out.svg
+    font2svg --variations 'wght:500;wdth:200' font.ttf out.svg
+";
+
+struct Args {
+    #[allow(dead_code)] variations: Vec<ttf::Variation>,
+    ttf_path: PathBuf,
+    svg_path: PathBuf,
+}
+
+fn main() {
+    let args = match parse_args() {
+        Ok(v) => v,
+        Err(e) => {
+            eprintln!("Error: {}.", e);
+            print!("{}", HELP);
+            std::process::exit(1);
+        }
+    };
+
+    if let Err(e) = process(args) {
+        eprintln!("Error: {}.", e);
+        std::process::exit(1);
+    }
+}
+
+fn parse_args() -> Result<Args, Box<dyn std::error::Error>> {
+    let mut args = pico_args::Arguments::from_env();
+
+    if args.contains(["-h", "--help"]) {
+        print!("{}", HELP);
+        std::process::exit(0);
+    }
+
+    let variations = args.opt_value_from_fn("--variations", parse_variations)?;
+    let free = args.finish();
+    if free.len() != 2 {
+        return Err("invalid number of arguments".into());
+    }
+
+    Ok(Args {
+        variations: variations.unwrap_or_default(),
+        ttf_path: PathBuf::from(&free[0]),
+        svg_path: PathBuf::from(&free[1]),
+    })
+}
+
+fn parse_variations(s: &str) -> Result<Vec<ttf::Variation>, &'static str> {
+    let mut variations = Vec::new();
+    for part in s.split(';') {
+        let mut iter = part.split(':');
+
+        let axis = iter.next().ok_or("failed to parse a variation")?;
+        let axis = ttf::Tag::from_bytes_lossy(axis.as_bytes());
+
+        let value = iter.next().ok_or("failed to parse a variation")?;
+        let value: f32 = value.parse().map_err(|_| "failed to parse a variation")?;
+
+        variations.push(ttf::Variation { axis, value });
+    }
+
+    Ok(variations)
+}
+
+fn process(args: Args) -> Result<(), Box<dyn std::error::Error>> {
+    let font_data = std::fs::read(&args.ttf_path)?;
+
+    // Exclude IO operations.
+    let now = std::time::Instant::now();
+
+    #[allow(unused_mut)]
+    let mut face = ttf::Face::from_slice(&font_data, 0)?;
+    if face.is_variable() {
+        #[cfg(feature = "variable-fonts")] {
+            for variation in args.variations {
+                face.set_variation(variation.axis, variation.value)
+                    .ok_or("failed to create variation coordinates")?;
+            }
+        }
+    }
+
+    let units_per_em = face.units_per_em();
+    let scale = FONT_SIZE / units_per_em as f64;
+
+    let cell_size = face.height() as f64 * FONT_SIZE / units_per_em as f64;
+    let rows = (face.number_of_glyphs() as f64 / COLUMNS as f64).ceil() as u32;
+
+    let mut svg = xmlwriter::XmlWriter::with_capacity(
+        face.number_of_glyphs() as usize * 512,
+        xmlwriter::Options::default(),
+    );
+    svg.start_element("svg");
+    svg.write_attribute("xmlns", "http://www.w3.org/2000/svg");
+    svg.write_attribute("xmlns:xlink", "http://www.w3.org/1999/xlink");
+    svg.write_attribute_fmt(
+        "viewBox",
+        format_args!("{} {} {} {}", 0, 0, cell_size * COLUMNS as f64, cell_size * rows as f64),
+    );
+
+    draw_grid(face.number_of_glyphs(), cell_size, &mut svg);
+
+    let mut path_buf = String::with_capacity(256);
+    let mut row = 0;
+    let mut column = 0;
+    for id in 0..face.number_of_glyphs() {
+        let x = column as f64 * cell_size;
+        let y = row as f64 * cell_size;
+
+        svg.start_element("text");
+        svg.write_attribute("x", &(x + 2.0));
+        svg.write_attribute("y", &(y + cell_size - 4.0));
+        svg.write_attribute("font-size", "36");
+        svg.write_attribute("fill", "gray");
+        svg.write_text_fmt(format_args!("{}", &id));
+        svg.end_element();
+
+        if let Some(img) = face.glyph_raster_image(ttf::GlyphId(id), std::u16::MAX) {
+            svg.start_element("image");
+            svg.write_attribute("x", &(x + 2.0 + img.x as f64));
+            svg.write_attribute("y", &(y - img.y as f64));
+            svg.write_attribute("width", &img.width);
+            svg.write_attribute("height", &img.height);
+            svg.write_attribute_raw("xlink:href", |buf| {
+                buf.extend_from_slice(b"data:image/png;base64, ");
+
+                let mut enc = base64::write::EncoderWriter::new(buf, base64::STANDARD);
+                enc.write_all(img.data).unwrap();
+                enc.finish().unwrap();
+            });
+            svg.end_element();
+        } else if let Some(img) = face.glyph_svg_image(ttf::GlyphId(id)) {
+            svg.start_element("image");
+            svg.write_attribute("x", &(x + 2.0));
+            svg.write_attribute("y", &(y + cell_size));
+            svg.write_attribute("width", &cell_size);
+            svg.write_attribute("height", &cell_size);
+            svg.write_attribute_raw("xlink:href", |buf| {
+                buf.extend_from_slice(b"data:image/svg+xml;base64, ");
+
+                let mut enc = base64::write::EncoderWriter::new(buf, base64::STANDARD);
+                enc.write_all(img).unwrap();
+                enc.finish().unwrap();
+            });
+            svg.end_element();
+        } else {
+            glyph_to_path(
+                x,
+                y,
+                &face,
+                ttf::GlyphId(id),
+                cell_size,
+                scale,
+                &mut svg,
+                &mut path_buf,
+            );
+        }
+
+        column += 1;
+        if column == COLUMNS {
+            column = 0;
+            row += 1;
+        }
+    }
+
+    println!("Elapsed: {}ms", now.elapsed().as_micros() as f64 / 1000.0);
+
+    std::fs::write(&args.svg_path, &svg.end_document())?;
+
+    Ok(())
+}
+
+fn draw_grid(
+    n_glyphs: u16,
+    cell_size: f64,
+    svg: &mut xmlwriter::XmlWriter,
+) {
+    let columns = COLUMNS;
+    let rows = (n_glyphs as f64 / columns as f64).ceil() as u32;
+
+    let width = columns as f64 * cell_size;
+    let height = rows as f64 * cell_size;
+
+    svg.start_element("path");
+    svg.write_attribute("fill", "none");
+    svg.write_attribute("stroke", "black");
+    svg.write_attribute("stroke-width", "5");
+
+    let mut path = String::with_capacity(256);
+
+    use std::fmt::Write;
+    let mut x = 0.0;
+    for _ in 0..=columns {
+        write!(&mut path, "M {} {} L {} {} ", x, 0.0, x, height).unwrap();
+        x += cell_size;
+    }
+
+    let mut y = 0.0;
+    for _ in 0..=rows {
+        write!(&mut path, "M {} {} L {} {} ", 0.0, y, width, y).unwrap();
+        y += cell_size;
+    }
+
+    path.pop();
+
+    svg.write_attribute("d", &path);
+    svg.end_element();
+}
+
+fn glyph_to_path(
+    x: f64,
+    y: f64,
+    face: &ttf::Face,
+    glyph_id: ttf::GlyphId,
+    cell_size: f64,
+    scale: f64,
+    svg: &mut xmlwriter::XmlWriter,
+    path_buf: &mut String,
+) {
+    path_buf.clear();
+    let mut builder = Builder(path_buf);
+    let bbox = match face.outline_glyph(glyph_id, &mut builder) {
+        Some(v) => v,
+        None => return,
+    };
+    if !path_buf.is_empty() {
+        path_buf.pop(); // remove trailing space
+    }
+
+    let bbox_w = (bbox.x_max as f64 - bbox.x_min as f64) * scale;
+    let dx = (cell_size - bbox_w) / 2.0;
+    let y = y + cell_size + face.descender() as f64 * scale;
+
+    let transform = format!("matrix({} 0 0 {} {} {})", scale, -scale, x + dx, y);
+
+    svg.start_element("path");
+    svg.write_attribute("d", path_buf);
+    svg.write_attribute("transform", &transform);
+    svg.end_element();
+
+    {
+        let bbox_h = (bbox.y_max as f64 - bbox.y_min as f64) * scale;
+        let bbox_x = x + dx + bbox.x_min as f64 * scale;
+        let bbox_y = y - bbox.y_max as f64 * scale;
+
+        svg.start_element("rect");
+        svg.write_attribute("x", &bbox_x);
+        svg.write_attribute("y", &bbox_y);
+        svg.write_attribute("width", &bbox_w);
+        svg.write_attribute("height", &bbox_h);
+        svg.write_attribute("fill", "none");
+        svg.write_attribute("stroke", "green");
+        svg.end_element();
+    }
+}
+
+struct Builder<'a>(&'a mut String);
+
+impl ttf::OutlineBuilder for Builder<'_> {
+    fn move_to(&mut self, x: f32, y: f32) {
+        use std::fmt::Write;
+        write!(self.0, "M {} {} ", x, y).unwrap()
+    }
+
+    fn line_to(&mut self, x: f32, y: f32) {
+        use std::fmt::Write;
+        write!(self.0, "L {} {} ", x, y).unwrap()
+    }
+
+    fn quad_to(&mut self, x1: f32, y1: f32, x: f32, y: f32) {
+        use std::fmt::Write;
+        write!(self.0, "Q {} {} {} {} ", x1, y1, x, y).unwrap()
+    }
+
+    fn curve_to(&mut self, x1: f32, y1: f32, x2: f32, y2: f32, x: f32, y: f32) {
+        use std::fmt::Write;
+        write!(self.0, "C {} {} {} {} {} {} ", x1, y1, x2, y2, x, y).unwrap()
+    }
+
+    fn close(&mut self) {
+        self.0.push_str("Z ")
+    }
+}

third-party/vendor/ttf-parser-0.15.2/examples/wasm/README.md

@@ -0,0 +1,18 @@
+# ttf-parser as a WebAssembly module
+
+## Build
+
+```sh
+rustup target add wasm32-unknown-unknown
+
+cargo build --target wasm32-unknown-unknown --release --manifest-path ../../c-api/Cargo.toml
+cp ../../c-api/target/wasm32-unknown-unknown/release/ttfparser.wasm .
+```
+
+## Run
+
+You can use any webserver that can serve `index.html`. Here is a Python example:
+
+```sh
+python -m http.server
+```

third-party/vendor/ttf-parser-0.15.2/examples/wasm/index.html

@@ -0,0 +1,67 @@
+<h2>ttf-parser in WebAssembly</h2>
+<p><small>(supports font files drag and drop)</small></p>
+<p><span id="fileName">TTC.ttc</span>:</p>
+<p><code>ttfp_fonts_in_collection():</code> <code id="fontsInCollection"></code></p>
+<p><code>ttfp_is_variable():</code> <code id="isVariable"></code></p>
+<p><code>ttfp_get_weight():</code> <code id="fontWeight"></code></p>
+<script>
+'use strict';
+
+let wasm;
+
+function update(fontBlob) {
+    const exports = wasm.instance.exports;
+
+    // How our heaped is structured, as ttf-parser doesn't allocate anything
+    // it is all ours and we can decide how to use it
+    const heapStart = exports.__heap_base.value;
+    const fontHandlerAddress = heapStart;
+    const fontHandlerLength = exports.ttfp_face_size_of();
+    const fontDataAddress = heapStart + fontHandlerLength;
+    const fontDataLength = fontBlob.length;
+
+    // Copy the fetched blob into WebAssembly machine
+    const heapu8 = new Uint8Array(exports.memory.buffer);
+    heapu8.set(fontBlob, fontDataAddress);
+
+    fontsInCollection.textContent = exports.ttfp_fonts_in_collection(fontDataAddress, fontDataLength);
+
+    // Create font handler
+    exports.ttfp_face_init(fontDataAddress, fontDataLength, 0/*face index*/, fontHandlerAddress);
+
+    isVariable.textContent = exports.ttfp_is_variable(fontHandlerAddress);
+    fontWeight.textContent = exports.ttfp_get_weight(fontHandlerAddress);
+}
+
+fetch('ttfparser.wasm').then(x => x.arrayBuffer()).then(WebAssembly.instantiate).then(result => {
+    wasm = result;
+    // Extend wasm machine heap once now that we are here, each page is 64kb
+    wasm.instance.exports.memory.grow(400);
+
+    // Could be done in parallel using Promise.all
+    fetch('TTC.ttc').then(x => x.arrayBuffer()).then(result => {
+        update(new Uint8Array(result));
+    });
+});
+
+document.addEventListener('dragover', e => {
+    e.stopPropagation(); e.preventDefault();
+}, false);
+document.addEventListener('dragleave', e => {
+    e.stopPropagation(); e.preventDefault();
+}, false);
+document.addEventListener('drop', e => {
+    e.stopPropagation(); e.preventDefault();
+    handleFontUpdate(e.dataTransfer.files[0]);
+});
+// document.addEventListener('paste', e => {
+//     handleFontUpdate(e.clipboardData.files[0]);
+// });
+function handleFontUpdate(file) {
+    if (!file) return;
+    fileName.textContent = file.name;
+    const reader = new FileReader();
+    reader.addEventListener('load', () => update(new Uint8Array(reader.result)));
+    reader.readAsArrayBuffer(file);
+}
+</script>