Table of Contents

Version 4.151.0

Skia m151 with managed perf wins · Released July 30, 2026 · NuGet · GitHub Release

API changes · SkiaSharp API diff · HarfBuzzSharp API diff

Highlights

SkiaSharp 4.151.0 updates to Skia m151 and ports several hot P/Invoke paths to managed code. Color and premultiply conversions, HarfBuzz buffer encoding, and tag parsing all move off native round-trips for lower overhead. It also fixes a native resource leak and a CPU raster regression.

Breaking Changes

None in this release.

Engine

  • Skia updated to milestone m151 — Brings the bundled Skia engine up to the m151 upstream release line, plus the ongoing chrome/m151 bug-fix merges throughout the preview cycle. (#4294, #4312, #4382, #4443, #4489)

API Surface

  • Span overloads for hex color parsing — SKColor hex parsing is optimized and gains ReadOnlySpan overloads for allocation-free parsing. (#4345)

Bug Fixes

  • Native resource leak in SKImage fixed — Fixes a native resource leak in SKImage.FromEncodedData(SKData, SKRectI). (#3997)
  • CPU raster regression fixed — Restores SK_ENABLE_LEGACY_SHADERCONTEXT to fix a CPU raster rendering regression introduced by the engine update. (#4428)

Lifecycle & Internals

  • Hot paths ported to managed code — SKColor-to-SKColorF conversion, single-value SKPMColor premultiply/unpremultiply, HarfBuzzSharp.Buffer.AddUtf8, HarfBuzzSharp.Tag.Parse, SKFourByteTag.Parse, and SKShaper glyph reads now avoid P/Invoke round-trips and per-call allocations. (#4370, #4385, #4376, #4408, #4396, #4388)

Platform

  • WASM Emscripten 5.0.6 support for .NET 11 — Adds Emscripten 5.0.6 static libraries built with the new exnref exception handling required by .NET 11. — ❤️ @ramezgerges (#4459, #4487)

HarfBuzzSharp 14.2.1

Makes Buffer.AddUtf8(string) allocation-free with a pooled UTF-8 encode and removes a per-call allocation from Tag.Parse.

Community Contributors ❤️

Thank you to everyone who contributed to this release!

Contributor Contributions
@ramezgerges Added Emscripten 5.0.6 WASM support for .NET 11 and bumped the Skia submodule to drop the SK_BUILD_FOR_WASM redefinition. (#3788, #4340, #4459)

Release Candidate 1 (July 21, 2026)

Release Candidate 1 fixed the SKImage native resource leak and the CPU raster regression ahead of the stable release.

Full changelog

Preview 2 (July 14, 2026)

Preview 2 added the managed performance ports for color conversion, HarfBuzz buffer encoding, and tag parsing.

Full changelog

Preview 1 (July 2, 2026)

Preview 1 updated Skia to milestone m151 and began the WASM Emscripten 5.0.6 work.

Full changelog

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