[skia-sync] Merge upstream Skia main (tip)

[mattleibow]

Description

Automated bleeding-edge sync from the tip of upstream Skia (google/skia main).

This pull request was produced by skia-upstream-sync.

Related issues

N/A — automated upstream synchronization.

Required skia PR

Requires mono/skia#356

Areas affected

• Managed API (binding/)
• Native / C API (externals/skia/src/c, include/c)
• Generated P/Invoke bindings
• Native dependency or Skia update
• Views & integrations
• Rendering output / visual behavior
• Performance
• Tests
• Build, packaging, or CI
• Documentation or samples

Changes

Updates the Skia submodule from cc43af052d3d98e605bee4ddc98671dafded1c57 to the exact tested
fork commit dae82239d2968742b54ee0d05feaad977bcf494c, which contains the audited upstream main
merge at db200e27a6344709ecaf6b90911f05b51a96ba63. Component Governance metadata now records
that exact submodule commit, upstream commit, and upstream ref while retaining milestone 154.

The upstream range did not change the exported C API. Binding regeneration produced no generated
diff, no new native functions, and no managed wrapper or test changes.

Testing

• Cold Linux x64 native source build passed with dotnet cake --target=externals-linux --arch=x64.
• All maintained binding generators completed; the managed SkiaSharp project build passed.
• Unfiltered tests/SkiaSharp.Tests.Console.slnx passed: Singleton 1/1; Core 6,127 passed,
  33 skipped; Direct3D 2 passed, 3 platform-policy skips; Vulkan 23 passed, 2 platform-policy
  skips. The Linux-required Vulkan backend initialized and executed; no required backend was
  skipped.

Human review

Review the cross-repository link to the mono/skia change and the retained milestone 154 metadata.
Native and runtime validation was performed only on Linux x64. Windows, macOS, Android, Apple
mobile platforms, WebAssembly, and their platform-specific graphics backends remain for CI.

Checklist

• Tests added or updated when behavior required them, or the report explains why not
• Changes above lists all public API and behavioral changes or states that none changed
• Documentation follow-up filed, or no public API changed
• Companion mono/skia PR linked above and bindings regenerated

Last rendered by the sync workflow: 2026-09-05T20:27:17Z

[github-actions]

📦 Try the packages from this PR

Warning

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 -- 5021

PowerShell / Windows:

iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 5021"

Step 2 — Add the local NuGet source

dotnet nuget add source ~/.skiasharp/hives/pr-5021/packages --name skiasharp-pr-5021

More options

Option	Description
--successful-only / -SuccessfulOnly	Only use successful builds
--force / -Force	Overwrite previously downloaded packages
--list / -List	List available artifacts without downloading
--build-id ID / -BuildId ID	Download from a specific build

Or download manually from Azure Pipelines — look for the nuget artifact on the build for this PR.

Remove the source when you're done:

dotnet nuget remove source skiasharp-pr-5021

[github-actions]

📊 SkiaSharp benchmarks — PR #5021

⭐ this PR (full source build) vs 🌙 nightly · Linux · Windows · macOS

Informational only — this never blocks the PR. 🟢 faster / less allocation · 🔴 slower / more allocation; moves under 5% are hidden as noise.

⏱️ Times are raw BenchmarkDotNet means, and the ⭐ PR and baseline legs run on separate CI runners, so microbenchmarks can swing run-to-run — treat small time deltas as noise. Allocations are deterministic and the reliable signal. The interactive perf-dashboard (linked below) applies smoothing for the trend view.

Highlights

⏱️ Time — 🔴 2 slower · 🟢 81 faster

• 🟢 MatrixOpsBenchmark.Invert(Count: 4096) · Windows · 223.66 µs → 94.89 µs (-58%)
• 🟢 ColorMathBenchmark.ToColor(Colors: 4096) · Windows · 15.82 µs → 7.67 µs (-52%)
• 🟢 MatrixMapPointsBenchmark.MapPoints(Points: 256) · Windows · 194.2 ns → 102.8 ns (-47%)
• 🟢 BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 64) · Windows · 247.64 µs → 135.21 µs (-45%)
• 🟢 RuntimeEffectShaderBenchmark.DrawFrame · Windows · 1.15 ms → 627.01 µs (-45%)
• …and 78 more (see details below)

Full per-OS benchmark deltas

Linux

⏱️ Time (vs 🌙 nightly 4.154.0-nightly.26454.13)

Benchmark	baseline	this PR	Δ
ColorMathBenchmark.ToColor(Colors: 4096)	15.37 µs	9.08 µs	🟢 -41%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 256)	1.46 ms	1.12 ms	🟢 -24%
PathBoundsBenchmark.TightBounds(Points: 64)	1.02 µs	783.7 ns	🟢 -23%
MatrixMapPointsBenchmark.MapPoints(Points: 4096)	2.88 µs	2.23 µs	🟢 -23%
RasterImageLifecycleBenchmark.CreateDataWithReleaseProc(Count: 256)	104.86 µs	82.28 µs	🟢 -22%
RasterImageLifecycleBenchmark.CreateRasterImage(Count: 256)	258.69 µs	207.17 µs	🟢 -20%
SceneRenderBenchmark.RenderFrame(Complexity: 1)	3.99 ms	3.20 ms	🟢 -20%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 1024)	1.99 ms	1.61 ms	🟢 -19%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 2048)	7.78 ms	6.28 ms	🟢 -19%
SceneRenderBenchmark.RenderFrame(Complexity: 4)	18.29 ms	14.79 ms	🟢 -19%
CanvasDrawBenchmark.Draw(Shapes: 64)	4.24 ms	3.44 ms	🟢 -19%
CanvasDrawBenchmark.Draw(Shapes: 512)	33.57 ms	27.54 ms	🟢 -18%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 256)	938.72 µs	772.90 µs	🟢 -18%
ColorParseBenchmark.Parse(Iterations: 1000)	72.07 µs	59.50 µs	🟢 -17%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 64)	253.35 µs	209.45 µs	🟢 -17%
RuntimeEffectShaderBenchmark.DrawFrame	2.83 ms	2.35 ms	🟢 -17%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 64)	352.92 µs	292.96 µs	🟢 -17%
LargeImageScaleBenchmark.UpscaleOpaque(Size: 2048)	2.67 ms	2.22 ms	🟢 -17%
MatrixMapPointsBenchmark.MapRadius(Points: 4096)	229.07 µs	190.91 µs	🟢 -17%
ColorMathBenchmark.ToColorF(Colors: 4096)	13.12 µs	10.94 µs	🟢 -17%
MatrixMapPointsBenchmark.MapVector(Points: 256)	10.98 µs	9.19 µs	🟢 -16%
PathBoundsBenchmark.TightBounds(Points: 1024)	10.59 µs	8.89 µs	🟢 -16%
LargeImageScaleBenchmark.UpscaleOpaque(Size: 1024)	679.12 µs	570.77 µs	🟢 -16%
MatrixMapPointsBenchmark.MapVector(Points: 4096)	172.95 µs	148.71 µs	🟢 -14%
ColorMathBenchmark.UnPreMultiply(Colors: 4096)	11.41 µs	9.84 µs	🟢 -14%
…and 9 more

Windows

⏱️ Time (vs 🌙 nightly 4.154.0-nightly.26454.13)

Benchmark	baseline	this PR	Δ
MatrixOpsBenchmark.Invert(Count: 4096)	223.66 µs	94.89 µs	🟢 -58%
ColorMathBenchmark.ToColor(Colors: 4096)	15.82 µs	7.67 µs	🟢 -52%
MatrixMapPointsBenchmark.MapPoints(Points: 256)	194.2 ns	102.8 ns	🟢 -47%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 64)	247.64 µs	135.21 µs	🟢 -45%
RuntimeEffectShaderBenchmark.DrawFrame	1.15 ms	627.01 µs	🟢 -45%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 256)	949.16 µs	520.00 µs	🟢 -45%
MatrixMapPointsBenchmark.MapPoints(Points: 4096)	2.48 µs	1.36 µs	🟢 -45%
ColorMathBenchmark.PreMultiply(Colors: 4096)	13.30 µs	7.33 µs	🟢 -45%
CanvasDrawBenchmark.Draw(Shapes: 512)	21.65 ms	12.21 ms	🟢 -44%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 256)	1.25 ms	704.84 µs	🟢 -43%
CanvasDrawBenchmark.Draw(Shapes: 64)	2.69 ms	1.53 ms	🟢 -43%
ColorMathBenchmark.UnPreMultiply(Colors: 4096)	12.35 µs	7.03 µs	🟢 -43%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 64)	337.67 µs	195.21 µs	🟢 -42%
SceneRenderBenchmark.RenderFrame(Complexity: 1)	2.20 ms	1.27 ms	🟢 -42%
ColorParseBenchmark.Parse(Iterations: 1000)	77.26 µs	46.46 µs	🟢 -40%
SceneRenderBenchmark.RenderFrame(Complexity: 4)	9.99 ms	6.04 ms	🟢 -40%
ColorMathBenchmark.ToColorF(Colors: 4096)	13.38 µs	8.18 µs	🟢 -39%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 2048)	10.23 ms	6.43 ms	🟢 -37%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 1024)	2.58 ms	1.64 ms	🟢 -36%
MatrixMapPointsBenchmark.MapPoint(Points: 256)	4.86 µs	3.12 µs	🟢 -36%
MatrixMapPointsBenchmark.MapPoint(Points: 4096)	78.01 µs	51.70 µs	🟢 -34%
MatrixMapPointsBenchmark.MapVector(Points: 256)	8.16 µs	5.44 µs	🟢 -33%
MatrixMapPointsBenchmark.MapVector(Points: 4096)	129.39 µs	88.63 µs	🟢 -32%
PathBoundsBenchmark.TightBounds(Points: 1024)	15.64 µs	10.72 µs	🟢 -31%
PathBoundsBenchmark.TightBounds(Points: 64)	1.51 µs	1.05 µs	🟢 -30%
…and 9 more

macOS

⏱️ Time (vs 🌙 nightly 4.154.0-nightly.26454.13)

Benchmark	baseline	this PR	Δ
LargeImageScaleBenchmark.UpscaleOpaque(Size: 2048)	2.96 ms	2.17 ms	🟢 -26%
LargeImageScaleBenchmark.UpscaleOpaque(Size: 1024)	729.73 µs	558.01 µs	🟢 -24%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 64)	270.84 µs	207.65 µs	🟢 -23%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 2048)	6.30 ms	5.32 ms	🟢 -16%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 256)	819.06 µs	692.85 µs	🟢 -15%
ColorMathBenchmark.ToColor(Colors: 4096)	20.12 µs	17.26 µs	🟢 -14%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 1024)	1.59 ms	1.36 ms	🟢 -14%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 64)	178.21 µs	157.03 µs	🟢 -12%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 256)	647.92 µs	572.83 µs	🟢 -12%
ColorMathBenchmark.PreMultiply(Colors: 4096)	9.97 µs	8.90 µs	🟢 -11%
MatrixMapPointsBenchmark.MapPoints(Points: 4096)	1.73 µs	1.85 µs	🔴 +7%
MatrixOpsBenchmark.Invert(Count: 4096)	72.17 µs	67.32 µs	🟢 -7%
PathBoundsBenchmark.TightBounds(Points: 64)	962.5 ns	900.9 ns	🟢 -6%
MatrixMapPointsBenchmark.MapPoints(Points: 256)	148.0 ns	156.2 ns	🔴 +6%
SceneRenderBenchmark.RenderFrame(Complexity: 1)	1.30 ms	1.23 ms	🟢 -5%

📈 Full interactive perf-dashboard & run details →

[github-actions]

📖 Documentation Preview

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