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4 Commits

Author SHA1 Message Date
Frank Barchard
86a4d94d7a I420ToRAW and I420ToRGB24 1 pass AVX2 and AVX512VBMI 
- Implemented `I422ToRGB24Row_AVX2` and `I422ToRGB24Row_AVX512VBMI` in:
 - `row_gcc.cc`: Inline assembly for GCC/Clang.
 - `row_win.cc`: C++ intrinsics for MSVC (also verified with Clang).

Reduced width alignment requirement: changed from 32-pixel to 16-pixel
alignment in `convert_argb.cc` and `row_any.cc`. This allows the AVX2
path to be used for more common video resolutions.

```
I420ToRAW vs Rust on Icelake Xeon
Size        I420ToRAW     yuv420_to_rgb  iterations
-------     ---------   ---------------  ----------
640x480         57 us    77.377 µs/iter     3000
1280x720       170 us   221.671 µs/iter     1000
1920x1080      396 us   494.324 µs/iter      500
3840x2160     2040 us      2357 µs/iter      200
```

Bug: 42280902
Change-Id: I07c0505c95410ea16a6218c858844791a11ef073
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/7908323
Reviewed-by: Wan-Teh Chang <wtc@google.com>
Reviewed-by: richard winterton <rrwinterton@gmail.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>
 2026-07-20 18:15:10 -07:00
Frank Barchard
4be798d7c5 BGRAToI420 use BgraConstants for a direct conversion using AVX512BW 
row win (msvc)
Was C/SSSE3
BGRAToARGB_Opt (594 ms)
BGRAToARGB_Endswap_Opt (609 ms)
BGRAToI420_Opt (122 ms)

Now AVX2
BGRAToARGB_Opt (100 ms)
BGRAToARGB_Endswap_Opt (99 ms)
BGRAToI420_Opt (115 ms)

Clang/GCC AVX512BW
BGRAToARGB_Opt (86 ms)
BGRAToARGB_Endswap_Opt (91 ms)
BGRAToI420_Opt (110 ms)


Bug: 42280902
Change-Id: I52cb2b0cacea8f2f0b138ec3cc521185dbef8595
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/7905821
Commit-Queue: Frank Barchard <fbarchard@google.com>
Reviewed-by: richard winterton <rrwinterton@gmail.com>
 2026-06-08 12:21:47 -07:00
Frank Barchard
cda55fcf53 Mirrow AVX2 functions for Visual C 
Bug: libyuv:42280902
Change-Id: Iabbec9af3a4f4dd89294e60145823c7fc4dd6ec6
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/7843378
Commit-Queue: Frank Barchard <fbarchard@google.com>
Reviewed-by: richard winterton <rrwinterton@gmail.com>
 2026-05-15 15:05:31 -07:00
Frank Barchard
9a0226cb3f Add GEMINI.md with guidelines on libyuv 
Bug: None
Change-Id: If5d2d84ff88b3c7069f0f6e9c98a4acb76078618
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/7800069
Reviewed-by: Dale Curtis <dalecurtis@chromium.org>
 2026-04-28 16:41:45 -07:00