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Frank Barchard 42eb3a552f [libyuv] Add ScaleRowDown2Box_AVX512BW with tail masking 
Add AVX-512BW implementations of ScaleRowDown2_AVX512BW,
ScaleRowDown2Linear_AVX512BW, ScaleRowDown2Box_AVX512BW, and
ScaleRowDown2Box_Odd_AVX512BW in scale_gcc.cc.

Use 512-bit zmm vectors (64 source bytes -> 32 destination pixels per
iteration) with vpmovwb narrowing stores, and handle remaining 1..31
destination pixels in-place using hardware mask register k1 (vmovdqu16
zero-masked loads for 2-byte source pixel pairs and vpmovwb masked
narrowing store), eliminating the ScaleRowDown2*_Any_AVX2 fallback on
AVX-512BW CPUs.

Hook up the new row functions in ScalePlaneDown2 (source/scale.cc) and
I420Blend (source/planar_functions.cc).

I420ScaleDownBy2_Box
(LIBYUV_WIDTH=638 LIBYUV_HEIGHT=360 LIBYUV_REPEAT=2000):
CPU                      SSSE3    AVX2  AVX512  512/AVX2
AMD Turin (Zen 5)           57      62      36     1.72x
Intel Granite Rapids        76      76      45     1.69x
AMD Genoa (Zen 4)           85      84      50     1.68x
Intel Sapphire Rapids       68      73      44     1.66x
Intel Emerald Rapids        69      66      48     1.38x
Intel Ice Lake             128     128      96     1.33x
Intel Skylake-X            153     150     121     1.24x
AMD Milan (Zen 3)           95      95      96         -
Intel Haswell              193     172     162         -

R=rrwinterton@gmail.com

Bug: libyuv:960
Test: libyuv_unittest --gtest_filter=*ScalePlaneDown2*:*I420Blend*
Change-Id: Ifbfcc4042c50d28022b12cb807dad56e66e7f301
TAG=agy
CONV=5f01827f-2aa8-4718-b8c1-7f282730918e
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/8504320
Reviewed-by: richard winterton <rrwinterton@gmail.com>
2026-10-05 10:56:34 -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 ScaleRowDown2Box_AVX512BW with tail masking 2026-10-05 10:56:34 -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 ScaleRowDown2Box_AVX512BW with tail masking 2026-10-05 10:56:34 -07:00
tools_libyuv Remove libyuv dependency on base/ 2025-01-08 09:04:21 -08:00
unit_test Add a box filter to ScaleUV 2026-10-02 15:37:21 -07:00
util [libyuv] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -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] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -07:00
BUILD.gn [libyuv] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -07:00
CM_linux_packages.cmake Use grep extended regex for version 2024-11-13 02:11:17 +00:00
CMakeLists.txt [libyuv] Fix RISC-V CMake/GN/Bazel builds and C compiler driver linking 2026-09-28 10:59:30 -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.