fission-ir
v0.10.0
Intermediate representation and display-list primitives for Fission rendering
Install
cargo add fission-ir
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Platform support
Declared by the crate author and captured when this directory was generated.
Android
Supported
iOS
Supported
Linux
Supported
macOS
Supported
Windows
Supported
Web
Supported
Terminal
Supported
Static site
Supported
Server-rendered
Supported
Package metadata
crates.io
View package
Documentation
Not provided
Repository
Open link
License
MIT
Latest version
0.10.0
Downloads
2044
Last updated
2026-08-02T15:08:21.291441Z
Categories
gui
rendering
Keywords
cross-platform
display-list
fission
rendering
ui-framework
Published versions
0.10.0
0.9.2
0.9.1
0.9.0
0.8.0
0.7.0
0.6.3
0.6.2
0.6.1
0.6.0
0.5.1
0.5.0
Dependencies
Dependency metadata is not indexed yet.
README
fission-ir
The intermediate representation (IR) for the Fission UI framework.
What is this?
fission-ir defines the node graph that sits between the high-level widget tree
and the low-level layout and paint pipelines. Every widget compiles down to one or
more IR nodes, each carrying a single [Op] that describes what the node does:
lay out children, draw something on screen, group subtrees, or declare
accessibility semantics.
The IR is platform-agnostic and serializable. It can be diffed, hashed, sent
across process boundaries, and inspected by tooling without pulling in any
rendering backend.
Core concepts
Type | Purpose |
|---|---|
[CoreIR] | Root container that owns every node and tracks the tree root. |
[CoreNode] | A single node: an ID, an operation, child links, and a content hash. |
[WidgetId] | Content-addressed 128-bit identity (BLAKE3). Stable across rebuilds when the structure is unchanged. |
[Op] | What a node does. One of four categories: Layout, Paint, Structural, or Semantics. |
Operations at a glance
Layout -- how children are sized and positioned:Box, Flex, Grid, GridItem, Scroll, ZStack, Align, Positioned,AbsoluteFill, Embed, Flyout, Transform, Clip.
Paint -- what gets drawn:DrawRect, DrawText, DrawRichText, DrawImage, DrawPath, DrawSvg.
Structural -- grouping without visual effect:Group.
Semantics -- accessibility and interaction metadata:
role, label, actions, focus, drag-and-drop, scroll axes, and more.
Quick example
use fission_ir::{CoreIR, WidgetId, Op, LayoutOp};
let mut ir = CoreIR::new();
let root = WidgetId::explicit("root");
let child = WidgetId::explicit("child");
ir.add_node(child, Op::Layout(LayoutOp::Box {
width: Some(100.0),
height: Some(50.0),
min_width: None,
max_width: None,
min_height: None,
max_height: None,
padding: [0.0; 4],
flex_grow: 0.0,
flex_shrink: 1.0,
aspect_ratio: None,
}), vec![]);
ir.add_node(root, Op::Layout(LayoutOp::Flex {
direction: fission_ir::FlexDirection::Column,
wrap: fission_ir::FlexWrap::NoWrap,
flex_grow: 1.0,
flex_shrink: 1.0,
padding: [8.0; 4],
gap: Some(4.0),
align_items: fission_ir::AlignItems::Start,
justify_content: fission_ir::JustifyContent::Start,
}), vec![child]);
ir.set_root(root);
Serialization
All types derive serde::Serialize and serde::Deserialize, so the entire IR
can be round-tripped through JSON, MessagePack, or any other serde-compatible
format.
License
MIT
README
fission-ir
The intermediate representation (IR) for the Fission UI framework.
What is this?
fission-ir defines the node graph that sits between the high-level widget tree
and the low-level layout and paint pipelines. Every widget compiles down to one or
more IR nodes, each carrying a single [Op] that describes what the node does:
lay out children, draw something on screen, group subtrees, or declare
accessibility semantics.
The IR is platform-agnostic and serializable. It can be diffed, hashed, sent
across process boundaries, and inspected by tooling without pulling in any
rendering backend.
Core concepts
Type | Purpose |
|---|---|
[CoreIR] | Root container that owns every node and tracks the tree root. |
[CoreNode] | A single node: an ID, an operation, child links, and a content hash. |
[WidgetId] | Content-addressed 128-bit identity (BLAKE3). Stable across rebuilds when the structure is unchanged. |
[Op] | What a node does. One of four categories: Layout, Paint, Structural, or Semantics. |
Operations at a glance
Layout -- how children are sized and positioned:Box, Flex, Grid, GridItem, Scroll, ZStack, Align, Positioned,AbsoluteFill, Embed, Flyout, Transform, Clip.
Paint -- what gets drawn:DrawRect, DrawText, DrawRichText, DrawImage, DrawPath, DrawSvg.
Structural -- grouping without visual effect:Group.
Semantics -- accessibility and interaction metadata:
role, label, actions, focus, drag-and-drop, scroll axes, and more.
Quick example
use fission_ir::{CoreIR, WidgetId, Op, LayoutOp};
let mut ir = CoreIR::new();
let root = WidgetId::explicit("root");
let child = WidgetId::explicit("child");
ir.add_node(child, Op::Layout(LayoutOp::Box {
width: Some(100.0),
height: Some(50.0),
min_width: None,
max_width: None,
min_height: None,
max_height: None,
padding: [0.0; 4],
flex_grow: 0.0,
flex_shrink: 1.0,
aspect_ratio: None,
}), vec![]);
ir.add_node(root, Op::Layout(LayoutOp::Flex {
direction: fission_ir::FlexDirection::Column,
wrap: fission_ir::FlexWrap::NoWrap,
flex_grow: 1.0,
flex_shrink: 1.0,
padding: [8.0; 4],
gap: Some(4.0),
align_items: fission_ir::AlignItems::Start,
justify_content: fission_ir::JustifyContent::Start,
}), vec![child]);
ir.set_root(root);
Serialization
All types derive serde::Serialize and serde::Deserialize, so the entire IR
can be round-tripped through JSON, MessagePack, or any other serde-compatible
format.
License
MIT
Package metadata
crates.io
View package
Documentation
Not provided
Repository
Open link
License
MIT
Latest version
0.10.0
Downloads
2044
Last updated
2026-08-02T15:08:21.291441Z
Categories
gui
rendering
Keywords
cross-platform
display-list
fission
rendering
ui-framework
Published versions
0.10.0
0.9.2
0.9.1
0.9.0
0.8.0
0.7.0
0.6.3
0.6.2
0.6.1
0.6.0
0.5.1
0.5.0
Dependencies
Dependency metadata is not indexed yet.