---
name: makepad-font-e31d44cdd23f
description: |
  CRITICAL: Use for Makepad font and text rendering. Triggers on:
  makepad font, makepad text, makepad glyph, makepad typography,
  font atlas, text layout, font family, font size, text shaping,
  makepad 字体, makepad 文字, makepad 排版, makepad 字形
risk: safe
source: community
---

# Makepad Font Skill

> **Version:** makepad-widgets (dev branch) | **Last Updated:** 2026-01-19
>
> Check for updates: https://crates.io/crates/makepad-widgets

You are an expert at Makepad text and font rendering. Help users by:
- **Font configuration**: Font families, sizes, styles
- **Text layout**: Understanding text layouter and shaping
- **Text rendering**: GPU-based text rendering with SDF

## Documentation

Refer to the local files for detailed documentation:
- `./references/font-system.md` - Font module structure and APIs

## IMPORTANT: Documentation Completeness Check

**Before answering questions, Claude MUST:**

1. Read the relevant reference file(s) listed above
2. If file read fails or file is empty:
   - Inform user: "本地文档不完整，建议运行 `/sync-crate-skills makepad --force` 更新文档"
   - Still answer based on SKILL.md patterns + built-in knowledge
3. If reference file exists, incorporate its content into the answer

## Text Module Structure

```
draw/src/text/
├── font.rs           # Font handle and metrics
├── font_atlas.rs     # GPU texture atlas for glyphs
├── font_face.rs      # Font face data
├── font_family.rs    # Font family management
├── fonts.rs          # Built-in fonts
├── glyph_outline.rs  # Glyph vector outlines
├── glyph_raster_image.rs # Rasterized glyph images
├── layouter.rs       # Text layout engine
├── rasterizer.rs     # Glyph rasterization
├── sdfer.rs          # Signed distance field generator
├── selection.rs      # Text selection/cursor
├── shaper.rs         # Text shaping (harfbuzz)
```

## Using Fonts in DSL

### Text Style

```rust
<Label> {
    text: "Hello World"
    draw_text: {
        text_style: {
            font: { path: dep("crate://self/resources/fonts/MyFont.ttf") }
            font_size: 16.0
            line_spacing: 1.5
            letter_spacing: 0.0
        }
        color: #FFFFFF
    }
}
```

### Theme Fonts

```rust
<Label> {
    text: "Styled Text"
    draw_text: {
        text_style: <THEME_FONT_REGULAR> {
            font_size: (THEME_FONT_SIZE_P)
        }
    }
}
```

## Font Definition in DSL

```rust
live_design! {
    // Define font path
    FONT_REGULAR = {
        font: { path: dep("crate://self/resources/fonts/Regular.ttf") }
    }

    FONT_BOLD = {
        font: { path: dep("crate://self/resources/fonts/Bold.ttf") }
    }

    // Use in widget
    <Label> {
        draw_text: {
            text_style: <FONT_REGULAR> {
                font_size: 14.0
            }
        }
    }
}
```

## Layouter API

```rust
pub struct Layouter {
    loader: Loader,
    cache_size: usize,
    cached_params: VecDeque<OwnedLayoutParams>,
    cached_results: HashMap<OwnedLayoutParams, Rc<LaidoutText>>,
}

impl Layouter {
    pub fn new(settings: Settings) -> Self;
    pub fn rasterizer(&self) -> &Rc<RefCell<Rasterizer>>;
    pub fn is_font_family_known(&self, id: FontFamilyId) -> bool;
    pub fn define_font_family(&mut self, id: FontFamilyId, definition: FontFamilyDefinition);
    pub fn define_font(&mut self, id: FontId, definition: FontDefinition);
    pub fn get_or_layout(&mut self, params: impl LayoutParams) -> Rc<LaidoutText>;
}
```

## Layout Parameters

```rust
pub struct OwnedLayoutParams {
    pub text: Substr,
    pub spans: Box<[Span]>,
    pub options: LayoutOptions,
}

pub struct Span {
    pub style: Style,
    pub len: usize,
}

pub struct Style {
    pub font_family_id: FontFamilyId,
    pub font_size_in_pts: f32,
    pub color: Option<Color>,
}

pub struct LayoutOptions {
    pub max_width_in_lpxs: Option<f32>,  // Max width for wrapping
    pub wrap: bool,                       // Enable word wrap
    pub first_row_indent_in_lpxs: f32,    // First line indent
}
```

## Rasterizer Settings

```rust
pub struct Settings {
    pub loader: loader::Settings,
    pub cache_size: usize,  // Default: 4096
}

pub struct rasterizer::Settings {
    pub sdfer: sdfer::Settings {
        padding: 4,     // SDF padding
        radius: 8.0,    // SDF radius
        cutoff: 0.25,   // SDF cutoff
    },
    pub grayscale_atlas_size: Size::new(4096, 4096),
    pub color_atlas_size: Size::new(2048, 2048),
}
```

## DrawText Widget

```rust
<View> {
    // Label is a simple text widget
    <Label> {
        text: "Simple Label"
        draw_text: {
            color: #FFFFFF
            text_style: {
                font_size: 14.0
            }
        }
    }

    // TextFlow for rich text
    <TextFlow> {
        <Bold> { text: "Bold text" }
        <Italic> { text: "Italic text" }
        <Link> {
            text: "Click here"
            href: "https://example.com"
        }
    }
}
```

## Text Properties

| Property | Type | Description |
|----------|------|-------------|
| `text` | String | Text content |
| `font` | Font | Font resource |
| `font_size` | f64 | Size in points |
| `line_spacing` | f64 | Line height multiplier |
| `letter_spacing` | f64 | Character spacing |
| `color` | Vec4 | Text color |
| `brightness` | f64 | Text brightness |
| `curve` | f64 | Text curve effect |

## When Answering Questions

1. Makepad uses SDF (Signed Distance Field) for crisp text at any scale
2. Fonts are loaded once and cached in GPU texture atlases
3. Text shaping uses harfbuzz for proper glyph positioning
4. Use `dep("crate://...")` for embedded font resources
5. Default font cache size is 4096 glyphs
6. Atlas sizes: 4096x4096 for grayscale, 2048x2048 for color (emoji)


## When to Use
Use this skill when tackling tasks related to its primary domain or functionality as described above.

## Limitations
- Use this skill only when the task clearly matches the scope described above.
- Do not treat the output as a substitute for environment-specific validation, testing, or expert review.
- Stop and ask for clarification if required inputs, permissions, safety boundaries, or success criteria are missing.


---
Source attribution: igorgui1337
Original project: https://github.com/igorgui1337/open_claudete/blob/ae9844ca82c18a0ba3411ee8c847647977d06d93/skill/.agents/skills/makepad-font/SKILL.md
License: MIT
License information: https://opensource.org/license/mit
Original upstream instructions; downloaded from Mega AI Hub.

## Upstream license notice

MIT License

Copyright (c) 2024 Igão_1337

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.



# Mega AI Hub resource metadata

Creator / publisher: igorgui1337
Original project: https://github.com/igorgui1337/open_claudete/blob/ae9844ca82c18a0ba3411ee8c847647977d06d93/skill/.agents/skills/makepad-font/SKILL.md
Attribution basis: Source repository record

Fields of work: Design, Development & Engineering
Roles: Frontend Developer, Product Designer, UX Designer
Specialties: Frontend
Tools: Makepad
Country applicability: Country not specified
Classification basis: Source catalog labels
Instruction SHA-256: 08fe27d6357cc9de58496ee40d6290f133925fabd40dbc9fa3b244992c435da5