Add gradient interpolation color space support (CSS Color Level 4)#3775
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Add gradient interpolation color space support (CSS Color Level 4)#3775mattleibow wants to merge 3 commits into
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Add CSS Color Level 4 gradient interpolation to SkiaSharp's gradient shader APIs, wrapping Skia's SkGradientShader::Interpolation (available since m114). C API: - sk_gradient_interpolation_colorspace_t enum (11 color spaces) - sk_gradient_interpolation_huemethod_t enum (4 hue methods) - sk_gradient_interpolation_t struct - 4 new gradient functions with interpolation parameter C# API: - SKGradientInterpolationColorSpace enum (Destination, SrgbLinear, Lab, OKLab, OKLabGamutMap, LCH, OKLCH, OKLCHGamutMap, Srgb, HSL, HWB) - SKGradientInterpolationHueMethod enum (Shorter, Longer, Increasing, Decreasing) - SKGradientInterpolation struct - New overloads on CreateLinearGradient, CreateRadialGradient, CreateSweepGradient, CreateTwoPointConicalGradient Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
…nt-interpolation-colorspace # Conflicts: # externals/skia
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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📦 Try the packages from this PRWarning Do not run these scripts without first reviewing the code in this PR. Step 1 — Download the packages bash / macOS / Linux: curl -fsSL https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.sh | bash -s -- 3775PowerShell / Windows: iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 3775"Step 2 — Add the local NuGet source dotnet nuget add source ~/.skiasharp/hives/pr-3775/packages --name skiasharp-pr-3775More options
Or download manually from Azure Pipelines — look for the Remove the source when you're done: dotnet nuget remove source skiasharp-pr-3775 |
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Fixes #3773
Summary
Adds CSS Color Level 4 gradient interpolation support to SkiaSharp's gradient shader APIs, wrapping Skia's
SkGradient::Interpolation.New API surface
SKGradientInterpolationColorSpaceSKGradientInterpolationHueMethodSKGradientInterpolationSKShader.CreateLinearGradientSKShader.CreateRadialGradientSKShader.CreateSweepGradientSKShader.CreateTwoPointConicalGradientWhy
OKLab/OKLCH interpolation eliminates the muddy gray midpoints that plague sRGB gradient blending. Web platforms now default to OKLab (CSS Color Level 4). Display P3 and Rec2020 wide-gamut displays need proper color space interpolation.
Notes
Tests
39 tests covering all 4 gradient types, all 11 color spaces, all 4 hue methods, struct equality/defaults, premul, error cases, and a perceptual quality comparison (OKLab vs sRGB midpoint saturation).
Gallery sample
Updated
GradientSample.cswith an "Interpolation Color Space" picker (9 non-experimental options).