Add IGRAPHICS_CPU_METAL backend for Skia CPU rendering with Metal blitting #1322
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…tting This new backend mode combines CPU-based Skia rendering with Metal for efficient display. It's enabled when both IGRAPHICS_CPU and IGRAPHICS_METAL are defined. Key implementation details: - CPU raster surface for Skia rendering (kBGRA_8888_SkColorType) - Metal texture created for blitting to drawable - EndFrame uploads pixels via replaceRegion and blits using MTLBlitCommandEncoder - Platform views (macOS/iOS) updated to set up CAMetalLayer for this mode This approach provides software rendering reliability while leveraging Metal for hardware-accelerated display, similar to SWELL's Metal blitting approach.
…ing on Windows This new backend mode combines CPU-based Skia rendering with Direct3D 11 for efficient display on Windows. It's enabled when IGRAPHICS_CPU, IGRAPHICS_D3D, and OS_WIN are all defined. Key implementation details: - CPU raster surface for Skia rendering (kBGRA_8888_SkColorType) - D3D11 device, swap chain, and staging texture created for blitting - EndFrame maps staging texture, copies pixels, then copies to back buffer - Uses IDXGISwapChain::Present() for hardware-accelerated display This mirrors the IGRAPHICS_CPU_METAL approach for macOS/iOS, providing software rendering reliability with GPU-accelerated display output.
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This new backend mode combines CPU-based Skia rendering with Metal for
efficient display. It's enabled when both IGRAPHICS_CPU and IGRAPHICS_METAL
are defined.
Key implementation details:
This approach provides software rendering reliability while leveraging Metal
for hardware-accelerated display, similar to SWELL's Metal blitting approach.