# Takumi

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Takumi is a library with different parts to render your React components to images. This crate contains the core logic for layout, rendering.

Checkout the [Integrations](https://takumi.kane.tw/docs/integrations) page if you are looking for Node.js / WASM bindings.

## Walkthrough

Create a [`GlobalContext`](https://docs.rs/takumi/latest/takumi/struct.GlobalContext.html) to store image resources, font caches, the instance should be reused to speed up the rendering.

Then call [`render`](https://docs.rs/takumi/latest/takumi/rendering/render/) with [`Node`](https://docs.rs/takumi/latest/takumi/layout/node/trait.Node.html) and [`Viewport`](https://docs.rs/takumi/latest/takumi/layout/viewport/struct.Viewport.html) to get [`RgbaImage`](image::RgbaImage).

Theres a helper function [`write_image`](https://docs.rs/takumi/latest/takumi/rendering/write/fn.write_image.html) to write the image to a destination implements [`Write`](std::io::Write) and [`Seek`](std::io::Seek).

## Example

```rust
use takumi::{
  layout::{
    node::{ContainerNode, TextNode, NodeKind, Node},
    Viewport,
    style::Style,
  },
  rendering::{render, RenderOptionsBuilder},
  GlobalContext,
};

// Create a node tree with `ContainerNode` and `TextNode`
let mut node = NodeKind::Container(ContainerNode {
  children: Some(vec![
    NodeKind::Text(TextNode {
      text: "Hello, world!".to_string(),
      style: None, // Construct with `StyleBuilder`
      tw: None, // Tailwind properties
    }),
  ]),
  style: None,
  tw: None, // Tailwind properties
});

// Create a context for storing resources, font caches.
// You should reuse the context to speed up the rendering.
let mut global = GlobalContext::default();

// Load fonts
// pass an optional [`FontInfoOverride`](parley::FontInfoOverride) to override the font's metadata,
// and an optional [`GenericFamily`](parley::GenericFamily) to specify the generic family of the font.
global.font_context.load_and_store(include_bytes!("../../assets/fonts/geist/Geist[wght].woff2"), None, None);

// Create a viewport
let viewport = Viewport::new(Some(1200), Some(630));

// Create render options
let options = RenderOptionsBuilder::default()
  .viewport(viewport)
  .node(node)
  .global(&global)
  .build()
  .unwrap();

// Render the layout to an `RgbaImage`
let image = render(options).unwrap();
```

## Feature Flags

- `woff2`: Enable WOFF2 font support.
- `woff`: Enable WOFF font support.
- `svg`: Enable SVG support.
- `rayon`: Enable rayon support.
- `avif`: Enable AVIF support.

## Credits

- [taffy](https://github.com/DioxusLabs/taffy) for the layout system.
- [image](https://github.com/image-rs/image) for the image processing.
- [parley](https://github.com/linebender/parley) for the text layout.
- [wuff](https://github.com/nicoburns/wuff) for woff/woff2 decompression.
- [ts-rs](https://github.com/AlephAlpha/ts-rs) for the type-safe serialization.
- [resvg](https://github.com/linebender/resvg) for SVG parsing and rendering.

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