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Dispatch the editor preview's RGBA row unpad through AVX2, or SSSE3 when AVX2 is absent. The same function tightens portable camera-blur readback when that texture is RGBA.
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Run the existing odd-width and padded-stride cases through the scalar, SSSE3, and AVX2 helpers, gated by runtime feature detection. The dispatcher picks AVX2 whenever it is available, so those cases never reached the SSSE3 tail before.
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Summary
unpad_rgba_to_bgra(used byframe_imagefor every RGBA editor preview frame, and portable camera-blur readback when the texture is RGBA) now uses AVX2vpshufb(8 px) when available, SSSE3 (4 px) otherwise, and the prior scalar loop as fallback. Channel swap + tight pack of already-RGBA pixels — does not replace YUYV/NV12/BGRZ kernels (#3294 path still coexists).Benchmarks
rustc 1.95.0,
opt-level=3, thin LTO,codegen-units=1,RUSTFLAGS=-C target-cpu=x86-64. Intel Xeon family 6 model 207 (AVX2+SSSE3). Warmup 10, 30 measured, interleaved, median. Before = scalar pointer loop in the same binary.Tests
Release
assert_eqmatched on all three sizes. Unit tests: AVX2 and SSSE3 match scalar on full 1248×702 (odd widths + padding).Notes
kyzer/desktop-gpui-avx2-rgba-bgra-unpad-5e89(Kyzer sole author).
The PR appears safe to merge; no actionable issue remains from this review.Summary
Adds AVX2 and SSSE3 paths for RGBA-to-BGRA frame conversion, with a scalar fallback.
No new actionable issues were found. Tests were inspected but not run.
Reviews (7) · Last reviewed commit: "fix: allow busy Wayland compositors to e..." · Reviewed by Greptile