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Frank Barchard eb8eda9c79 [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 
Implement RAWToRGB24Row_WASMSIMD and RAWToRGB24Row_Any_WASMSIMD in
source/row_wasm.cc for RGB24ToRAW and RAWToRGB24 conversions:
- Process 16 pixels (48 bytes) per loop iteration using three 128-bit
  loads, three byte-wise shuffles, and four 2-way blends.
- Use wasm_i8x16_relaxed_swizzle when __wasm_relaxed_simd__ is enabled
  (compiling to a single vpshufb on x86 without bounds-checking
  overhead) and fall back to wasm_i8x16_swizzle for baseline SIMD128.
- Add kCpuHasWASM (0x100) and kCpuHasWASMSIMD (0x101) CPU feature
  flags and enable -msimd128 in BUILD.bazel, BUILD.gn, and
  CMakeLists.txt for WebAssembly targets.

Performance (RAWToRGB24_Opt, 1280x720, V8 d8):
CPU                     WASM C  SIMD128  Relaxed  SIMD Spd  Rlx Spd
-------------------------------------------------------------------
AMD Zen 4             595.0 us 137.0 us  84.0 us     4.34x    7.08x
AMD Zen 3             708.0 us 148.0 us 107.0 us     4.78x    6.62x
AMD Zen 5             375.0 us 107.0 us  67.0 us     3.50x    5.60x
ARM Neoverse-V2       638.0 us 118.0 us 116.0 us     5.41x    5.50x
ARM Neoverse-N1      1046.0 us 294.0 us 294.0 us     3.56x    3.56x
Intel Ice Lake        707.0 us 209.0 us 220.0 us     3.38x    3.21x
Intel Haswell        1110.0 us 344.0 us 360.0 us     3.23x    3.08x
Intel Emerald Rapids  519.0 us 207.0 us 208.0 us     2.51x    2.50x
Intel Sapphire Rapids 551.0 us 220.0 us 255.0 us     2.50x    2.16x
ARM Cortex-A53      14440.0 us 8660.0us 6920.0us     1.67x    2.09x
Intel Granite Rapids  453.0 us 225.0 us 221.0 us     2.01x    2.05x

Bug: 42271072
Test: libyuv_test --gunit_filter=*RAWToRGB24*:*RGB24ToRAW*:*Cpu*
Change-Id: Id902668263a2ab70aa300eeeea18851490c917b5
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8515581
Reviewed-by: richard winterton <rrwinterton@gmail.com>
Commit-Queue: Frank Barchard <fbarchard@google.com>
2026-10-05 17:45:41 -07:00
build_overrides [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
docs convert, scale: Add P010/P210/P410 convert paths and NV16/NV24/Px10 scale 2026-09-23 20:43:22 -07:00
include [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
infra/config Use default xcode version in libyuv 2025-11-24 07:54:14 -08:00
riscv_script [libyuv] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -07:00
source [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
tools_libyuv Remove libyuv dependency on base/ 2025-01-08 09:04:21 -08:00
unit_test [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
util [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
.clang-format clang-format libyuv 2016-11-07 17:37:23 -08:00
.gitignore DetilePlane and unittest for NEON 2022-01-31 20:05:55 +00:00
.gn [build] Use hermetic python3 for script_executable in .gn 2026-09-28 06:02:39 -07:00
Android.bp [libyuv] Update build files with missing sources and sort lists 2026-09-03 11:02:07 -07:00
Android.mk [libyuv] Update build files with missing sources and sort lists 2026-09-03 11:02:07 -07:00
AUTHORS Fix same-width vertical point upsampling 2026-08-24 19:28:50 -07:00
BUILD.bazel [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
BUILD.gn [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
CM_linux_packages.cmake Use grep extended regex for version 2024-11-13 02:11:17 +00:00
CMakeLists.txt [libyuv] Add WASM SIMD128 and Relaxed SIMD for RAWToRGB24Row 2026-10-05 17:45:41 -07:00
codereview.settings [infra] remove no longer supported git cl upload setting. 2021-04-28 12:47:52 +00:00
DEPS [build] Use hermetic python3 for script_executable in .gn 2026-09-28 06:02:39 -07:00
DIR_METADATA Move metadata in OWNERS files to DIR_METADATA files 2021-02-09 19:34:43 +00:00
download_vs_toolchain.py Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
GEMINI.md GEMINI.md: Update Arm wording and guidance 2026-08-18 11:21:14 -07:00
libyuv.bzl [libyuv] Simplify RVV configuration in BUILD.bazel and libyuv.bzl 2026-09-08 17:50:17 -07:00
libyuv.gni [libyuv] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -07:00
libyuv.gyp Stop setting --dynamic-linker for target_os="android" 2026-05-27 04:34:07 -07:00
libyuv.gypi [libyuv] Update build files with missing sources and sort lists 2026-09-03 11:02:07 -07:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
linux.mk Deprecate MIPS and MSA support. 2025-10-16 12:20:40 -07:00
OWNERS Remove magjed from OWNERS 2026-08-24 10:43:21 -07:00
PATENTS LibYuv: Adding PATENT and LICENSE files 2011-10-25 16:15:49 +00:00
PRESUBMIT.py Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
public.mk use unix line endings 2018-06-20 23:19:59 +00:00
pylintrc Update pylintrc to a pep-8 like style 2024-12-18 05:38:56 -08:00
README.chromium ARGBToRGB24 AVX512 with tail masking 2026-09-29 16:15:44 -07:00
README.md Update README.md and environment_variables.md for Arm 2024-09-20 00:29:33 +00:00
vpython.toml [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
vpython.toml.uv.lock [vpython] Migrate .vpython3 to vpython.toml 2026-09-18 00:28:26 -07:00
winarm.mk NV12 Copy, include scale_uv.h 2020-12-08 18:54:16 +00:00
WORKSPACE.bazel Add Bazel build support 2026-04-15 18:20:26 -07:00

README.md

libyuv is an open source project that includes YUV scaling and conversion functionality.

  • Scale YUV to prepare content for compression, with point, bilinear or box filter.
  • Convert to YUV from webcam formats for compression.
  • Convert to RGB formats for rendering/effects.
  • Rotate by 90/180/270 degrees to adjust for mobile devices in portrait mode.
  • Optimized for SSSE3/AVX2 on x86/x64.
  • Optimized for Neon/SVE2/SME on Arm.
  • Optimized for MSA on Mips.
  • Optimized for RVV on RISC-V.

Development

See Getting started for instructions on how to get started developing.

You can also browse the docs directory for more documentation.