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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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Cargo.toml
+3 -2
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@@ -166,8 +166,9 @@ url = "2.5"
tokio = { version = "1.29", features = ["fs", "macros", "io-std", "rt", "rt-multi-thread"] }
# Linebender ecosystem (BEGIN)
kurbo = { version = "0.13", features = ["serde"] }
vello = "0.9"
vello_encoding = "0.9"
# TODO: Return to crates.io versions once a release after 0.9 ships the ramp bake's `interpolation_alpha_space` support
vello = { git = "https://github.com/linebender/vello.git", rev = "7073a85d61ee099d1d3595651ddf92302b074348" }
vello_encoding = { git = "https://github.com/linebender/vello.git", rev = "7073a85d61ee099d1d3595651ddf92302b074348" }
resvg = "0.47"
usvg = "0.47"
simplecss = "0.2"