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Fix Vello rendering incompatibility with its gradients using premultiplied alpha instead of SVG's straight (#4419)

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* Upgrade Vello to a git main revision that honors the brush's interpolation alpha space

* Interpolate Vello gradients with straight alpha, matching the SVG renderer

* Draw the gradient picker strip and fill swatches as SVG so transparency previews with straight alpha

* Keep gradient stop handles opaque so a transparent stop's RGB stays visible

* Paint a stopless gradient's picker strip and swatch black rather than transparent
This commit is contained in:
Keavon Chambers
2026-08-07 18:45:12 -07:00
committed by GitHub
parent 681b4033f5
commit 6b1e9912ef
9 changed files with 172 additions and 69 deletions
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5
node-graph/libraries/rendering/src/renderer.rs
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@@ -538,7 +538,8 @@ fn create_peniko_gradient_brush(gradient_list: &List<Gradient>, multiplied_trans
},
extend: peniko_extend(settings.spread),
stops: peniko_stops,
interpolation_alpha_space: peniko::InterpolationAlphaSpace::Premultiplied,
// Straight alpha, keeping parity with the SVG renderer's stop interpolation
interpolation_alpha_space: peniko::InterpolationAlphaSpace::Unpremultiplied,
..Default::default()
});
@@ -2315,7 +2316,7 @@ impl Render for List<Gradient> {
kind,
stops,
extend,
interpolation_alpha_space: peniko::InterpolationAlphaSpace::Premultiplied,
interpolation_alpha_space: peniko::InterpolationAlphaSpace::Unpremultiplied,
..Default::default()
});
let brush_transform = kurbo::Affine::new(gradient_placement(gradient_transform, gradient_form).to_cols_array());