### Interactive Program Notice for GPL

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/licenses/Saab.txt

Display this short notice when your program starts in interactive mode to inform users about its free software status and warranty.

```text
Gnomovision version 69, Copyright (C) year name of author
Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
```

--------------------------------

### Check Harfbuzz Version

Source: https://github.com/yeslogic/allsorts/blob/master/tests/myanmar/README.md

Verify the installed version of the Harfbuzz shaping tool.

```bash
$ hb-shape --version
hb-shape (HarfBuzz) 9.0.0
```

--------------------------------

### Generate test-font.ttf with fonttools

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/opentype/README.md

Generates a test font file from its TTX description using the fonttools command-line interface. Ensure fonttools is installed.

```bash
ttx  -o test-font.ttf test-font.ttx
```

--------------------------------

### Clone and enter AOTS repository

Source: https://github.com/yeslogic/allsorts/blob/master/tests/aots/README.md

Initial steps to acquire the AOTS source code.

```bash
git clone https://github.com/adobe-type-tools/aots.git
cs aots
```

--------------------------------

### Standard Copyright Notice for GPL

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/licenses/Saab.txt

Include this notice at the beginning of each source file to convey the exclusion of warranty and specify licensing terms under the GNU GPL.

```text
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year>  <name of author>

This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
```

--------------------------------

### Copy test data to project directory

Source: https://github.com/yeslogic/allsorts/blob/master/tests/aots/README.md

Synchronizes the generated test files to the local project font directory.

```bash
rsync -az tests/ /path/to/prince/src/fonts/fontcode-rust/tests/aots/
```

--------------------------------

### Load and Parse Fonts

Source: https://context7.com/yeslogic/allsorts/llms.txt

Reads a font file from disk and initializes a Font instance for further operations. Automatically detects TTF, OTF, WOFF, and WOFF2 formats.

```rust
use allsorts::binary::read::ReadScope;
use allsorts::font_data::FontData;
use allsorts::Font;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // Read font file into memory
    let buffer = std::fs::read("font.ttf")?;

    // Parse the font file - automatically detects format (TTF, OTF, WOFF, WOFF2)
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;

    // Get a table provider for font index 0 (use different index for TTC collections)
    let provider = font_file.table_provider(0)?;

    // Create the Font instance for shaping and glyph operations
    let font = Font::new(provider)?;

    println!("Font has {} glyphs", font.num_glyphs());
    println!("Is variable font: {}", font.is_variable());

    Ok(())
}
```

--------------------------------

### Build AOTS library and test data

Source: https://github.com/yeslogic/allsorts/blob/master/tests/aots/README.md

Compiles the library and generates the necessary test data files.

```bash
make
```

--------------------------------

### Convert Variable Font to Static Instance

Source: https://context7.com/yeslogic/allsorts/llms.txt

Creates a static font file from a variable font by specifying axis values. The axis order in the user tuple must match the font's fvar table definition.

```rust
use allsorts::binary::read::ReadScope;
use allsorts::font_data::FontData;
use allsorts::tables::Fixed;
use allsorts::variations::instance;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let buffer = std::fs::read("variable-font.ttf")?;
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;
    let provider = font_file.table_provider(0)?;

    // Define axis values (order must match font's fvar axis order)
    // Example for wght (weight) and wdth (width) axes
    let user_tuple = [
        Fixed::from(700.0),  // Bold weight
        Fixed::from(100.0),  // Normal width
    ];

    // Create static instance
    let (instance_font, normalized_tuple) = instance(&provider, &user_tuple)?;

    // Write the instanced font
    std::fs::write("instance-bold.ttf", &instance_font)?;
    println!("Created static font instance: {} bytes", instance_font.len());

    Ok(())
}
```

--------------------------------

### Copyright Disclaimer for Proprietary Software

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/licenses/Saab.txt

Use this sample disclaimer to disclaim copyright interest in a program, particularly when developed by an employee.

```text
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.

<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
```

--------------------------------

### Generate Rust test cases

Source: https://github.com/yeslogic/allsorts/blob/master/tests/aots/README.md

Uses the Saxon XSLT processor to transform OpenType XML specifications into Rust test case source code.

```bash
java -jar jars/saxon9he.jar -s:src/opentype.xml -xsl:../../Work/prince/src/fonts/fontcode-rust/tests/aots/aots2testrust.xsl -o:../../Work/prince/src/fonts/fontcode-rust/tests/aots/testcases.rs
```

--------------------------------

### Generate SFNT-TTF-Composite WOFF2

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/woff2/README.md

Converts the SFNT-TTF-Composite TTX file into a WOFF2 font file.

```bash
ttx --flavor woff2 -o SFNT-TTF-Composite.woff2 SFNT-TTF-Composite.ttx
```

--------------------------------

### Dump 'post' table with allsorts-tools

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/opentype/README.md

Extracts the 'post' table from a TTF font file and saves it to a binary file using the allsorts dump command. This is useful for inspecting post-script table data.

```bash
allsorts dump -t post Caudex-Regular.ttf > tests/opentype/post.bin
```

--------------------------------

### Subset a font in Rust

Source: https://context7.com/yeslogic/allsorts/llms.txt

Creates a subset font containing only specified glyph IDs, suitable for PDF embedding. Requires a font file and a list of glyph indices.

```rust
use allsorts::binary::read::ReadScope;
use allsorts::font_data::FontData;
use allsorts::subset::{subset, CmapTarget, SubsetProfile};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let buffer = std::fs::read("font.otf")?;
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;
    let provider = font_file.table_provider(0)?;

    // Glyph IDs to include (0 = .notdef must always be first)
    let glyph_ids = [0, 36, 72, 82, 82, 88]; // Example: glyphs for "Hello"

    // Create subset font
    let subset_font = subset(
        &provider,
        &glyph_ids,
        &SubsetProfile::Pdf,         // Minimal tables for PDF embedding
        CmapTarget::Unrestricted,    // Auto-select best cmap format
    )?;

    // Write subset font to file
    std::fs::write("subset.otf", &subset_font)?;
    println!("Subset font size: {} bytes", subset_font.len());

    Ok(())
}
```

--------------------------------

### Dump 'CBLC' and 'CBDT' tables with allsorts-tools

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/opentype/README.md

Extracts the 'CBLC' and 'CBDT' tables from a TTF font file and saves them to binary files using the allsorts dump command. These tables are related to color glyphs.

```bash
allsorts dump -t CBLC NotoColorEmoji.ttf > allsorts/tests/fonts/opentype/CBLC.bin
```

```bash
allsorts dump -t CBDT NotoColorEmoji.ttf > allsorts/tests/fonts/opentype/CBDT.bin
```

--------------------------------

### Retrieve Glyph Names from Font

Source: https://context7.com/yeslogic/allsorts/llms.txt

Fetches PostScript names for specified glyph IDs from a font file. Requires a font file and the 'allsorts' crate.

```rust
use allsorts::binary::read::ReadScope;
use allsorts::font_data::FontData;
use allsorts::Font;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let buffer = std::fs::read("font.ttf")?;
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;
    let provider = font_file.table_provider(0)?;
    let font = Font::new(provider)?;

    // Get names for specific glyph IDs
    let glyph_ids = vec![0, 1, 36, 37, 72];
    let names = font.glyph_names(&glyph_ids);

    for (id, name) in glyph_ids.iter().zip(names.iter()) {
        println!("Glyph {}: {}", id, name);
    }
    // Output example:
    // Glyph 0: .notdef
    // Glyph 1: .null
    // Glyph 36: A
    // Glyph 37: B
    // Glyph 72: a

    Ok(())
}

```

--------------------------------

### Reconstruct Font from Selected Tables

Source: https://context7.com/yeslogic/allsorts/llms.txt

Converts WOFF to OTF by reconstructing a font from a specified set of tables. Useful for creating optimized font files for embedding.

```rust
use allsorts::binary::read::ReadScope;
use allsorts::font_data::FontData;
use allsorts::subset::whole_font;
use allsorts::tag;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let buffer = std::fs::read("font.woff")?;
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;
    let provider = font_file.table_provider(0)?;

    // Specify tables to include in output font
    let tags = [
        tag::CMAP, tag::HEAD, tag::HHEA, tag::HMTX,
        tag::MAXP, tag::NAME, tag::OS_2, tag::POST,
        tag::GLYF, tag::LOCA, // or tag::CFF for CFF fonts
    ];

    // Reconstruct font with specified tables
    let font_data = whole_font(&provider, &tags)?;
    std::fs::write("output.otf", &font_data)?;

    println!("Reconstructed font: {} bytes", font_data.len());
    Ok(())
}

```

--------------------------------

### Read and Inspect WOFF/WOFF2 Fonts

Source: https://context7.com/yeslogic/allsorts/llms.txt

Handles compressed web font formats (WOFF, WOFF2) with automatic decompression. Provides access to font metadata and unified API for font operations.

```rust
use allsorts::binary::read::ReadScope;
use allsorts::font_data::FontData;
use allsorts::woff::WoffFont;
use allsorts::Font;

fn main() -> Result<(), Box<dyn std::error::Error>> {
    // WOFF files are handled automatically via FontData
    let buffer = std::fs::read("webfont.woff")?;
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;

    match &font_file {
        FontData::Woff(woff) => {
            println!("WOFF font with {} tables", woff.table_directory.len());
            println!("Original sfnt flavor: 0x{:08X}", woff.flavor());

            // Access extended metadata if present
            if let Some(metadata) = woff.extended_metadata()? {
                println!("Metadata: {}", metadata);
            }
        }
        FontData::Woff2(_) => println!("WOFF2 font"),
        FontData::OpenType(_) => println!("OpenType font"),
    }

    // Use unified API regardless of format
    let provider = font_file.table_provider(0)?;
    let font = Font::new(provider)?;
    println!("Font has {} glyphs", font.num_glyphs());

    Ok(())
}

```

--------------------------------

### Generate Expected Indices with hb-shape

Source: https://github.com/yeslogic/allsorts/blob/master/tests/myanmar/README.md

Use this command to generate expected indices for good inputs using the Harfbuzz shaping tool.

```bash
xargs -d '\n' -n1 hb-shape --shapers ot,fallback --no-glyph-names --no-clusters --no-positions --remove-default-ignorables ../fonts/myanmar/Padauk-Regular.ttf < good > harfbuzz/good-padauk
```

--------------------------------

### Generate WOFF2 test-font

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/woff2/README.md

Uses fonttools to convert an OpenType TTX file into a WOFF2 format font file.

```bash
ttx --flavor woff2 -o test-font.woff2 ../opentype/test-font.ttx
```

--------------------------------

### Perform Text Shaping

Source: https://context7.com/yeslogic/allsorts/llms.txt

Converts text into positioned glyphs by applying GSUB and GPOS tables. Requires specifying script and language tags for correct substitution and kerning.

```rust
use allsorts::binary::read::ReadScope;
use allsorts::font::MatchingPresentation;
use allsorts::font_data::FontData;
use allsorts::gsub::{FeatureMask, Features};
use allsorts::{tag, Font};

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let buffer = std::fs::read("tests/fonts/opentype/Klei.otf")?;
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;
    let provider = font_file.table_provider(0)?;
    let mut font = Font::new(provider)?;

    // Define script and language tags
    let script = tag::LATN; // Latin script
    let lang = tag::DFLT;   // Default language

    // Map text to glyphs (handles Unicode normalization for script)
    let glyphs = font.map_glyphs(
        "Shaping in a jiffy.",
        script,
        MatchingPresentation::NotRequired,
    );

    // Shape the glyphs - applies GSUB substitutions and GPOS positioning
    let glyph_infos = font.shape(
        glyphs,
        script,
        Some(lang),
        Features::default_mask(), // Enable default features (liga, kern, etc.)
        &[],                      // No custom features
        None,                     // No variation tuple for variable fonts
        true,                     // Enable kerning
    )?;

    // Iterate through shaped glyphs with positioning info
    for info in &glyph_infos {
        println!(
            "Glyph ID: {}, X advance: {}, X offset: {}, Y offset: {}",
            info.glyph.glyph_index,
            info.horizontal_advance,
            info.placement.x,
            info.placement.y
        );
    }

    Ok(())
}
```

--------------------------------

### Font Specimen CSS Styles

Source: https://github.com/yeslogic/allsorts/blob/master/src/font_specimen/head.html

Defines the @font-face rule and layout styles for font specimen pages. Requires template variables for font family and source path.

```css
@font-face { src: url("{{ font_src }}"); font-family: "{{ family_name }}-{{ subfamily_name }}"; } body { font-family: sans-serif, "{{ family_name }}-{{ subfamily_name }}"; margin: 1em; } dt { font-weight: bold; text-transform: uppercase; font-size: 12px; letter-spacing: 0.3px; margin: 1.5em 0 0.25em; color: #444; } dd { margin: 0; } dd, li { line-height: 1.5; } .specimen-font { font-family: "{{ family_name }}-{{ subfamily_name }}", sans-serif; } .sample-text { margin-top: 1em; } .sample { margin: 0.5em 0 0; overflow-wrap: break-word; } .column-list { padding-left: 20px; margin-left: 0; columns: 250px; column-gap: 50px; } .count { float: right; margin-left: 1em; }
```

--------------------------------

### Dump 'head' table with allsorts-tools

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/opentype/README.md

Extracts the 'head' table from a TTF font file and saves it to a binary file using the allsorts dump command. This is useful for inspecting specific font table data.

```bash
allsorts dump -t head tests/opentype/test-font.ttf > tests/opentype/head.bin
```

--------------------------------

### Dump 'hmtx' table with allsorts-tools

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/opentype/README.md

Extracts the 'hmtx' table from a TTF font file and saves it to a binary file using the allsorts dump command. This is useful for inspecting horizontal metrics.

```bash
allsorts dump -t hmtx ../../../data/fonts/Ubuntu-R.ttf > tests/opentype/hmtx.bin
```

--------------------------------

### Dump 'name' table with allsorts-tools

Source: https://github.com/yeslogic/allsorts/blob/master/tests/fonts/opentype/README.md

Extracts the 'name' table from a TTF font file and saves it to a binary file using the allsorts dump command. This is useful for inspecting font naming information.

```bash
allsorts dump -t name ../../../data/fonts/test-font.ttf > tests/opentype/name.bin
```

--------------------------------

### Extract glyph outlines in Rust

Source: https://context7.com/yeslogic/allsorts/llms.txt

Extracts vector path commands from glyphs by implementing the OutlineSink trait. Supports both CFF and TrueType (glyf) font formats.

```rust
use std::fmt::Write;
use allsorts::binary::read::ReadScope;
use allsorts::cff::outline::CFFOutlines;
use allsorts::cff::CFF;
use allsorts::font::{GlyphTableFlag, MatchingPresentation};
use allsorts::font_data::FontData;
use allsorts::outline::{OutlineBuilder, OutlineSink};
use allsorts::pathfinder_geometry::line_segment::LineSegment2F;
use allsorts::pathfinder_geometry::vector::Vector2F;
use allsorts::tables::glyf::{GlyfVisitorContext, LocaGlyf};
use allsorts::tables::loca::{owned, LocaTable};
use allsorts::tables::SfntVersion;
use allsorts::{tag, Font};

// Implement OutlineSink to receive drawing commands
struct PathBuilder {
    path: String,
}

impl OutlineSink for PathBuilder {
    fn move_to(&mut self, to: Vector2F) {
        writeln!(&mut self.path, "M {} {}", to.x(), to.y()).unwrap();
    }

    fn line_to(&mut self, to: Vector2F) {
        writeln!(&mut self.path, "L {} {}", to.x(), to.y()).unwrap();
    }

    fn quadratic_curve_to(&mut self, ctrl: Vector2F, to: Vector2F) {
        writeln!(&mut self.path, "Q {} {} {} {}",
            ctrl.x(), ctrl.y(), to.x(), to.y()).unwrap();
    }

    fn cubic_curve_to(&mut self, ctrl: LineSegment2F, to: Vector2F) {
        writeln!(&mut self.path, "C {} {} {} {} {} {}",
            ctrl.from_x(), ctrl.from_y(),
            ctrl.to_x(), ctrl.to_y(),
            to.x(), to.y()).unwrap();
    }

    fn close(&mut self) {
        writeln!(&mut self.path, "Z").unwrap();
    }
}

fn main() -> Result<(), Box<dyn std::error::Error>> {
    let buffer = std::fs::read("tests/fonts/opentype/Klei.otf")?;
    let scope = ReadScope::new(&buffer);
    let font_file = scope.read::<FontData<'_>>()?;
    let provider = font_file.table_provider(0)?;
    let mut font = Font::new(provider)?;

    // Map a character to get its glyph
    let glyphs = font.map_glyphs("+", tag::LATN, MatchingPresentation::NotRequired);
    let glyph_id = glyphs[0].glyph_index;

    let mut sink = PathBuilder { path: String::new() };

    // Handle CFF or glyf outlines based on font type
    if font.glyph_table_flags.contains(GlyphTableFlag::CFF)
        && font.font_table_provider.sfnt_version() == tag::OTTO
    {
        let cff_data = font.font_table_provider.read_table_data(tag::CFF)?;
        let cff = ReadScope::new(&cff_data).read::<CFF<'_>>()?;
        let mut cff_outlines = CFFOutlines { table: &cff };
        cff_outlines.visit(glyph_id, None, &mut sink)?;
    } else if font.glyph_table_flags.contains(GlyphTableFlag::GLYF) {
        let loca_data = font.font_table_provider.read_table_data(tag::LOCA)?;
        let loca = ReadScope::new(&loca_data).read_dep::<LocaTable<'_>>((
            font.maxp_table.num_glyphs,
            font.head_table.index_to_loc_format,
        ))?;
        let glyf_data = font.font_table_provider.read_table_data(tag::GLYF).map(Box::from)?;
        let mut loca_glyf = LocaGlyf::loaded(owned::LocaTable::from(&loca), glyf_data);
        let mut ctx = GlyfVisitorContext::new(&mut loca_glyf, None);
        ctx.visit(glyph_id, None, &mut sink)?;
    }

    println!("Path commands for glyph {}:\n{}", glyph_id, sink.path);
    Ok(())
}
```