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gpui: Add PathBuilder based on lyon to build Path (#22808)

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Release Notes:

- N/A

---

Continue https://github.com/zed-industries/zed/pull/20499

We to draw more complex Path. Before this change, we only have
`line_to`, but it is not enough.

Add a new `PathBuilder` to use [lyon](https://github.com/nical/lyon) to
build more complex path.

And then with PR #22812 to enable anti-aliasing, all thing will be
perfect.
## Show case

```bash
cargo run -p gpui --example painting
```

Before:

<img width="1136" alt="image"
src="https://github.com/user-attachments/assets/0c15833a-ec95-404c-a469-24cf172cfd86"
/>

After:

<img width="1136" alt="image"
src="https://github.com/user-attachments/assets/42cfa35e-7e8f-4ef3-bb2d-b98defc62ad6"
/>
This commit is contained in:
Jason Lee 2025-01-30 04:14:33 +08:00 • committed by GitHub
parent 706f7be5e7
commit 31fa414422
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GPG key ID: B5690EEEBB952194
8 changed files with 449 additions and 79 deletions
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14
crates/gpui/examples/gradient.rs
View file

@ -218,13 +218,17 @@ impl Render for GradientViewer {
let height = square_bounds.size.height;
let horizontal_offset = height;
let vertical_offset = px(30.);
let mut path = gpui::Path::new(square_bounds.bottom_left());
path.line_to(square_bounds.origin + point(horizontal_offset, vertical_offset));
path.line_to(
let mut builder = gpui::PathBuilder::fill();
builder.move_to(square_bounds.bottom_left());
builder
.line_to(square_bounds.origin + point(horizontal_offset, vertical_offset));
builder.line_to(
square_bounds.top_right() + point(-horizontal_offset, vertical_offset),
);
path.line_to(square_bounds.bottom_right());
path.line_to(square_bounds.bottom_left());
builder.line_to(square_bounds.bottom_right());
builder.line_to(square_bounds.bottom_left());
let path = builder.build().unwrap();
window.paint_path(
path,
linear_gradient(