SimdSkia.Imaging 0.1.0-preview.8

SimdSkia preview

0.1.0-preview.8 更新说明 / What's new

• 通用 x64：SSE2 字形/图像合成与采样、精确填充、字形串缓存及画布分配优化，保留 AVX2/标量回退。
• 本机固定 Avalonia 场景：CPU 吞吐综合耗时低于原版 4.4%，最慢场景落后 3.8%。Vulkan / Direct2D JIT 离屏完成帧含等待与回读低 29.8% / 35.3%；不代表任意场景或窗口呈现。
• 60 FPS 滚动分配 155.14→28.05 KiB/帧，原版 12.87；普通控件工作集 79.89 vs 原版 60.91 MiB，常驻内存未追平。
• 471,569 项精确检查、真实 Avalonia/GPU 功能和 460,050 项真实 AOT 采样通过；原版整页画质通过数仍为 CPU 0/5、GPU 0/12，完整画质未达标，未改判为成功。
• 仍为实验性预览版；字体、完整公共 API、macOS GPU 等限制保留，Avalonia 固定 12.1.4。完整数据与适用范围。

Every package includes CHANGELOG.md and NuGet release notes. See the complete release notes and final quality/performance report for test hardware, scope and limitations. This release adds precise eight-pixel AVX2 image filtering with scalar fallback and fixes alpha image blending; it does not claim universal renderer parity or lower resident memory.

An independent C# 2D renderer. No Google Skia rendering calls. This release is a preview: public API coverage, font support and rendering equivalence are incomplete. It is not a binary replacement for the strong-named SkiaSharp assembly.

Packages target .NET 8 or later:

dotnet add package SimdSkia.Avalonia.Desktop --version 0.1.0-preview.8

An existing Avalonia 12.1.4 application selects the adapter explicitly:

using SimdSkia.Avalonia;

AppBuilder.Configure<App>()
    .UseSimdSkiaDesktop()
    .StartWithClassicDesktopLifetime(args);

Windows uses its current message font; Linux/macOS discover supported installed static TrueType families. Explicit options.FontFiles.Add(path) overrides automatic selection. Parsing, shaping, glyph coverage and codecs remain C#. Chinese text needs a supported installed Chinese font. Complex shaping, CFF/variable/color fonts and hinting have gaps.

Startup preparation is enabled by default. To disable it for diagnosis, use .UseSimdSkiaDesktop(options => options.EnableStartupPreparation = false). It does not hide the window or add a placeholder frame. Keep all directly referenced SimdSkia packages on version 0.1.0-preview.8 and all Avalonia packages on 12.1.4.

The base adapter provides rendering/font services. The Desktop package supplies OS host selection without Skia/HarfBuzz/ANGLE packages. macOS uses the official MIT libAvaloniaNative window bridge, an explicit window-host exception; application drawing/fonts are managed. The optional GPU adapter defaults Direct2D to a native Windows swapchain; Vulkan currently waits for completion and reads back to the OS framebuffer. macOS GPU/Metal is not implemented. GPU glyphs normally use a managed atlas, and CPU layers/fallbacks are reported. See the complete quick start.

SimdSkia and SimdSkia.Compatibility expose only the implemented SK* subset. Do not reference them together with the original SkiaSharp types in the same compilation. Avalonia users normally need only the adapter, not the SK* facade.

MIT licensed. Third-party components retain their own licenses and notices, included in the relevant packages. See the repository's validation and remaining gaps.