[mattleibow]

Description

Automated upstream bug-fix sync for m156.

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

Related issues

N/A — automated upstream synchronization.

Required skia PR

Requires mono/skia#425

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

• Advanced externals/skia to tested mono/skia merge 6b29d163d04b984652a54779fcf2f4c6fc7a9254 in parent commit f6485dd9ea0bf214ab0226b26ceb75006ecb7485.
• Updated cgmanifest.json to record upstream chrome/m156 commit e8e04b1c75f6ad8a14d5971f7d56398e2837fd4c and the exact mono/skia commit.
• Kept milestone, package, assembly, file, and native API versions unchanged for this same-milestone bug-fix sync.
• Binding regeneration found no generated declaration changes or new native functions; no managed wrapper or test source changes were needed.

Testing

• Linux x64 native source build passed from the merged submodule.
• Managed binding build passed.
• tests/SkiaSharp.Tests.Console.slnx passed unfiltered on .NET 10: Singleton 1 passed, 0 skipped; Gallery 50 passed, 0 skipped; Core 6,488 passed, 33 skipped; Vulkan 23 passed, 2 skipped; Direct3D 2 passed, 3 skipped. All hosts had zero failures and no required backend was skipped.
• Version/dependency metadata validation and the final fork-patch audit passed against the exact committed gitlink.

Human review

• Confirm CI coverage on Windows, macOS, iOS, Android, WASM, and Linux arm64; only Linux x64 was executed locally.
• Review platform-policy skips separately from required backend coverage. Linux software GL/Vulkan initialization completed under the provisioned deterministic test environment.

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: 2026-11-02T19:51:56Z

[github-actions]

📖 Documentation Preview

Add the automation/staging label to build and publish a documentation preview for this PR.

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[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 -- 5575

PowerShell / Windows:

iex "& { $(irm https://raw.githubusercontent.com/mono/SkiaSharp/main/scripts/get-skiasharp-pr.ps1) } 5575"

Step 2 — Add the local NuGet source

dotnet nuget add source ~/.skiasharp/hives/pr-5575/packages --name skiasharp-pr-5575

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-5575

[github-actions]

📊 SkiaSharp benchmarks — PR #5575

⭐ 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 — 🔴 64 slower · 🟢 24 faster

• 🔴 ColorMathBenchmark.ToColor(Colors: 4096) · Linux · 5.03 µs → 12.03 µs (+139%)
• 🔴 MatrixMapPointsBenchmark.MapPoints(Points: 4096) · Linux · 1.52 µs → 3.15 µs (+106%)
• 🔴 ColorMathBenchmark.ToColorF(Colors: 4096) · Linux · 7.87 µs → 14.75 µs (+87%)
• 🔴 MatrixMapPointsBenchmark.MapPoints(Points: 256) · Linux · 144.5 ns → 268.4 ns (+86%)
• 🔴 RasterImageLifecycleBenchmark.CreateDataWithReleaseProc(Count: 256) · Linux · 61.90 µs → 109.01 µs (+76%)
• …and 83 more (see details below)

📦 Allocations — 🔴 1 more alloc · 🟢 0 less alloc

• 🔴 RuntimeEffectShaderBenchmark.DrawFrame · Linux · 680 B → 730 B (+7%)

Full per-OS benchmark deltas

Linux

⏱️ Time (vs 🌙 nightly 4.156.0-nightly.26551.1)

Benchmark	baseline	this PR	Δ
ColorMathBenchmark.ToColor(Colors: 4096)	5.03 µs	12.03 µs	🔴 +139%
MatrixMapPointsBenchmark.MapPoints(Points: 4096)	1.52 µs	3.15 µs	🔴 +106%
ColorMathBenchmark.ToColorF(Colors: 4096)	7.87 µs	14.75 µs	🔴 +87%
MatrixMapPointsBenchmark.MapPoints(Points: 256)	144.5 ns	268.4 ns	🔴 +86%
RasterImageLifecycleBenchmark.CreateDataWithReleaseProc(Count: 256)	61.90 µs	109.01 µs	🔴 +76%
SceneRenderBenchmark.RenderFrame(Complexity: 4)	17.13 ms	29.86 ms	🔴 +74%
CanvasDrawBenchmark.Draw(Shapes: 64)	3.09 ms	5.30 ms	🔴 +72%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 256)	595.58 µs	1.02 ms	🔴 +71%
CanvasDrawBenchmark.Draw(Shapes: 512)	24.77 ms	42.26 ms	🔴 +71%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 64)	161.00 µs	273.53 µs	🔴 +70%
RuntimeEffectShaderBenchmark.DrawFrame	3.15 ms	5.28 ms	🔴 +68%
SceneRenderBenchmark.RenderFrame(Complexity: 1)	3.86 ms	6.46 ms	🔴 +67%
RasterImageLifecycleBenchmark.CreateRasterImage(Count: 256)	154.60 µs	256.37 µs	🔴 +66%
PathBoundsBenchmark.TightBounds(Points: 1024)	6.31 µs	10.17 µs	🔴 +61%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 64)	229.59 µs	368.93 µs	🔴 +61%
PathBoundsBenchmark.TightBounds(Points: 64)	590.0 ns	943.6 ns	🔴 +60%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 2048)	5.08 ms	8.06 ms	🔴 +59%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 256)	896.38 µs	1.40 ms	🔴 +57%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 1024)	1.40 ms	2.11 ms	🔴 +51%
MatrixMapPointsBenchmark.MapVector(Points: 4096)	120.30 µs	179.33 µs	🔴 +49%
ColorParseBenchmark.Parse(Iterations: 1000)	44.63 µs	66.36 µs	🔴 +49%
MatrixMapPointsBenchmark.MapRadius(Points: 4096)	154.88 µs	228.66 µs	🔴 +48%
MatrixOpsBenchmark.Concat(Count: 4096)	145.14 µs	210.34 µs	🔴 +45%
MatrixMapPointsBenchmark.MapVector(Points: 256)	7.81 µs	11.19 µs	🔴 +43%
MatrixMapPointsBenchmark.MapRadius(Points: 256)	10.00 µs	14.22 µs	🔴 +42%
…and 9 more

📦 Allocations (vs 🌙 nightly 4.156.0-nightly.26551.1)

Benchmark	baseline	this PR	Δ
RuntimeEffectShaderBenchmark.DrawFrame	680 B	730 B	🔴 +7%

Windows

⏱️ Time (vs 🌙 nightly 4.156.0-nightly.26551.1)

Benchmark	baseline	this PR	Δ
MatrixMapPointsBenchmark.MapPoint(Points: 4096)	27.41 µs	41.34 µs	🔴 +51%
MatrixMapPointsBenchmark.MapPoint(Points: 256)	1.75 µs	2.59 µs	🔴 +49%
MatrixMapPointsBenchmark.MapPoints(Points: 256)	311.3 ns	175.7 ns	🟢 -44%
ColorMathBenchmark.ToColor(Colors: 4096)	11.15 µs	15.68 µs	🔴 +41%
MatrixMapPointsBenchmark.MapPoints(Points: 4096)	3.65 µs	2.43 µs	🟢 -33%
MatrixMapPointsBenchmark.MapRadius(Points: 256)	8.09 µs	10.52 µs	🔴 +30%
MatrixMapPointsBenchmark.MapRadius(Points: 4096)	131.49 µs	164.07 µs	🔴 +25%
ColorMathBenchmark.ToColorF(Colors: 4096)	17.29 µs	13.32 µs	🟢 -23%
PathBoundsBenchmark.TightBounds(Points: 1024)	16.73 µs	20.53 µs	🔴 +23%
PathBoundsBenchmark.TightBounds(Points: 64)	1.68 µs	2.05 µs	🔴 +22%
RuntimeEffectShaderBenchmark.DrawFrame	967.21 µs	1.14 ms	🔴 +18%
CanvasDrawBenchmark.Draw(Shapes: 512)	19.81 ms	23.29 ms	🔴 +18%
MatrixMapPointsBenchmark.MapVector(Points: 4096)	119.82 µs	140.80 µs	🔴 +18%
CanvasDrawBenchmark.Draw(Shapes: 64)	2.47 ms	2.90 ms	🔴 +17%
LargeImageScaleBenchmark.UpscaleOpaque(Size: 2048)	3.47 ms	2.93 ms	🟢 -16%
MatrixMapPointsBenchmark.MapVector(Points: 256)	7.73 µs	8.77 µs	🔴 +13%
RasterImageLifecycleBenchmark.CreateDataWithReleaseProc(Count: 256)	114.30 µs	128.56 µs	🔴 +12%
ColorMathBenchmark.UnPreMultiply(Colors: 4096)	11.37 µs	12.56 µs	🔴 +11%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 256)	901.57 µs	989.07 µs	🔴 +10%
MatrixOpsBenchmark.Invert(Count: 4096)	125.36 µs	135.95 µs	🔴 +8%
LargeImageScaleBenchmark.UpscaleOpaque(Size: 1024)	812.19 µs	745.99 µs	🟢 -8%
MatrixOpsBenchmark.Concat(Count: 4096)	228.69 µs	245.43 µs	🔴 +7%
MatrixMapPointsBenchmark.MapRect(Points: 4096)	180.75 µs	169.45 µs	🟢 -6%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 2048)	11.04 ms	10.45 ms	🟢 -5%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 256)	1.20 ms	1.26 ms	🔴 +5%

macOS

⏱️ Time (vs 🌙 nightly 4.156.0-nightly.26551.1)

Benchmark	baseline	this PR	Δ
LargeImageScaleBenchmark.UpscaleOpaque(Size: 1024)	850.04 µs	524.98 µs	🟢 -38%
MatrixMapPointsBenchmark.MapPoints(Points: 4096)	1.69 µs	2.33 µs	🔴 +38%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 256)	1.04 ms	667.30 µs	🟢 -36%
LargeImageScaleBenchmark.UpscaleOpaque(Size: 2048)	3.20 ms	2.22 ms	🟢 -31%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 1024)	1.81 ms	1.27 ms	🟢 -30%
LargeImageScaleBenchmark.UpscaleCrossfade(Size: 2048)	7.13 ms	5.12 ms	🟢 -28%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 256)	1.07 ms	859.68 µs	🟢 -20%
MatrixMapPointsBenchmark.MapPoint(Points: 4096)	19.88 µs	23.79 µs	🔴 +20%
ColorMathBenchmark.ToColor(Colors: 4096)	21.87 µs	17.78 µs	🟢 -19%
RasterImageLifecycleBenchmark.CreateDataWithReleaseProc(Count: 256)	68.07 µs	80.68 µs	🔴 +19%
BitmapDrawBenchmark.DrawScaledTiles(Tiles: 64)	313.43 µs	255.62 µs	🟢 -18%
MatrixOpsBenchmark.Invert(Count: 4096)	72.78 µs	61.55 µs	🟢 -15%
CanvasDrawBenchmark.Draw(Shapes: 64)	1.94 ms	1.64 ms	🟢 -15%
RasterImageLifecycleBenchmark.CreateRasterImage(Count: 256)	156.34 µs	179.54 µs	🔴 +15%
BitmapDrawBenchmark.DrawUnscaledTiles(Tiles: 64)	250.22 µs	214.56 µs	🟢 -14%
RuntimeEffectShaderBenchmark.DrawFrame	556.24 µs	628.36 µs	🔴 +13%
ColorMathBenchmark.UnPreMultiply(Colors: 4096)	8.80 µs	7.71 µs	🟢 -12%
MatrixMapPointsBenchmark.MapVector(Points: 256)	2.64 µs	2.95 µs	🔴 +12%
MatrixMapPointsBenchmark.MapRadius(Points: 256)	6.72 µs	7.51 µs	🔴 +12%
ColorMathBenchmark.PreMultiply(Colors: 4096)	9.23 µs	8.30 µs	🟢 -10%
MatrixOpsBenchmark.Concat(Count: 4096)	120.97 µs	132.04 µs	🔴 +9%
SceneRenderBenchmark.RenderFrame(Complexity: 4)	5.74 ms	6.26 ms	🔴 +9%
SceneRenderBenchmark.RenderFrame(Complexity: 1)	1.24 ms	1.35 ms	🔴 +9%
ColorMathBenchmark.ToColorF(Colors: 4096)	5.84 µs	5.40 µs	🟢 -8%
CanvasDrawBenchmark.Draw(Shapes: 512)	13.29 ms	12.30 ms	🟢 -7%
…and 4 more

📈 Full interactive perf-dashboard & run details →