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gpui: Improve path rendering & global multisample anti-aliasing (#29718)

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Currently, the rendering path required creating a texture for each path,
which wasted a large amount of video memory. In our application, simply
drawing some charts resulted in video memory usage as high as 5G.

I removed the step of creating path textures and directly drew the paths
on the rendering target, adding post-processing global multi-sampling
anti-aliasing. Drawing paths no longer requires allocating any
additional video memory and also improves the performance of path
rendering.

Release Notes:

- N/A

---------

Co-authored-by: Jason Lee <huacnlee@gmail.com>
This commit is contained in:
Sunli 2025-07-03 00:41:42 +08:00 • committed by GitHub
parent 9dc3ac9657
commit 4fdda8d5a1
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GPG key ID: B5690EEEBB952194
16 changed files with 486 additions and 726 deletions
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23
crates/gpui/examples/painting.rs
View file

@ -1,9 +1,13 @@
use gpui::{
Application, Background, Bounds, ColorSpace, Context, MouseDownEvent, Path, PathBuilder,
PathStyle, Pixels, Point, Render, SharedString, StrokeOptions, Window, WindowOptions, canvas,
div, linear_color_stop, linear_gradient, point, prelude::*, px, rgb, size,
PathStyle, Pixels, Point, Render, SharedString, StrokeOptions, Window, WindowBounds,
WindowOptions, canvas, div, linear_color_stop, linear_gradient, point, prelude::*, px, rgb,
size,
};
const DEFAULT_WINDOW_WIDTH: Pixels = px(1024.0);
const DEFAULT_WINDOW_HEIGHT: Pixels = px(768.0);
struct PaintingViewer {
default_lines: Vec<(Path<Pixels>, Background)>,
lines: Vec<Vec<Point<Pixels>>>,
@ -147,8 +151,6 @@ impl PaintingViewer {
px(320.0 + (i as f32 * 10.0).sin() * 40.0),
));
}
let path = builder.build().unwrap();
lines.push((path, gpui::green().into()));
Self {
default_lines: lines.clone(),
@ -183,9 +185,13 @@ fn button(
}
impl Render for PaintingViewer {
fn render(&mut self, _: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
fn render(&mut self, window: &mut Window, cx: &mut Context<Self>) -> impl IntoElement {
window.request_animation_frame();
let default_lines = self.default_lines.clone();
let lines = self.lines.clone();
let window_size = window.bounds().size;
let scale = window_size.width / DEFAULT_WINDOW_WIDTH;
let dashed = self.dashed;
div()
@ -222,7 +228,7 @@ impl Render for PaintingViewer {
move |_, _, _| {},
move |_, _, window, _| {
for (path, color) in default_lines {
window.paint_path(path, color);
window.paint_path(path.clone().scale(scale), color);
}
for points in lines {
@ -298,6 +304,11 @@ fn main() {
cx.open_window(
WindowOptions {
focus: true,
window_bounds: Some(WindowBounds::Windowed(Bounds::centered(
None,
size(DEFAULT_WINDOW_WIDTH, DEFAULT_WINDOW_HEIGHT),
cx,
))),
..Default::default()
},
|window, cx| cx.new(|cx| PaintingViewer::new(window, cx)),