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George Steed 03a935493d [AArch64] Simplify predicate width calculations 
Several of the existing SVE kernels used calculations of the form:

        remainder = width & (vl - 1) == 0 ? vl : width & (vl - 1);

This is due to initial SVE contributed code unconditionally using the
predicated tail for the final iteration even if the width was a perfect
multiple of the vector length.

In the current code the fully-predicated main body loop will instead
iterate through the width completely and simply skip over the tail
entirely. Skipping over the tail means that the case handled by the
ternary condition now never occurs, and the remainder calculation can
now simply be:

        remainder = width & (vl - 1);

This avoids the need for a compare and conditional select in the
function prologue.

Change-Id: Ia73f5f8bc66fad6bea64439dc2beeaccb54622d2
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/6067151
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
2024-12-03 21:54:32 +00:00
build_overrides Define enable_safe_libcxx in build_overrides/build.gni. 2023-05-03 06:08:40 +00:00
docs Update README.md and environment_variables.md for Arm 2024-09-20 00:29:33 +00:00
include [AArch64] Add Neon implementation of ScaleRowDown2Linear_16 2024-11-25 21:10:26 +00:00
infra/config infra: Move libyuv ci/try jobs from Ubuntu-18.04 to Ubuntu-22.04 2024-05-21 15:55:24 +00:00
riscv_script Support RVV v0.12 intrinsics for row_rvv.cc & scale_rvv.cc 2024-06-17 18:01:49 +00:00
source [AArch64] Simplify predicate width calculations 2024-12-03 21:54:32 +00:00
tools_libyuv Do not roll the Fuchsia SDK. 2023-07-03 09:18:00 +00:00
unit_test HalfFloat fix SigIll on aarch64 2024-11-22 22:08:00 +00:00
util Add CopyPlane_Unaligned, _Any and _Invert tests/benchmarksCpuId test 2024-11-19 23:53:05 +00:00
.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 Roll chromium_revision 829c6df33d..7d683aeda8 (945687:1050091) 2022-09-22 14:56:57 +00:00
.vpython remove swarming_client 2021-09-09 07:11:45 +00:00
.vpython3 Update vpython3 requests 2023-06-01 19:06:40 +00:00
Android.bp Split scale_test and scale_plane_test to allow building on small devices 2023-12-09 18:39:41 +00:00
Android.mk Split scale_test and scale_plane_test to allow building on small devices 2023-12-09 18:39:41 +00:00
AUTHORS [DEPS] Remove cleanup_links pre_deps_hooks 2024-04-08 15:47:48 +00:00
BUILD.gn [AArch64] Add SME implementation of ScaleRowDown2 2024-10-30 17:56:41 +00:00
CM_linux_packages.cmake Use grep extended regex for version 2024-11-13 02:11:17 +00:00
CMakeLists.txt Fix bugs in ARGBAttenuateRow_LASX/LSX function 2024-11-30 23:09:04 +00:00
codereview.settings [infra] remove no longer supported git cl upload setting. 2021-04-28 12:47:52 +00:00
DEPS Add hook to fetch reclient config files 2024-12-03 09:24:16 +00:00
DIR_METADATA Move metadata in OWNERS files to DIR_METADATA files 2021-02-09 19:34:43 +00:00
download_vs_toolchain.py Update gclient instructions + environment 2022-02-24 15:19:23 +00:00
libyuv.gni Revert "Do not enable libyuv_use_sme for is_android" 2024-10-15 18:20:36 +00:00
libyuv.gyp Add libyuv.gyp build files 2022-03-21 23:48:16 +00:00
libyuv.gypi Fix missing headers in GN/GYP build files 2024-04-01 09:19:24 +00:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
linux.mk Split convert_test and convert_argb_test to allow building on small systems that run out of memory compiling unittests. 2023-12-08 13:39:56 +00:00
OWNERS add jansson@google.com to infra owners to cover when Mirko is OOO 2022-10-28 09:46:02 +00:00
PATENTS LibYuv: Adding PATENT and LICENSE files 2011-10-25 16:15:49 +00:00
PRESUBMIT.py Update PRESUBMIT, cleanup_links and autoroller to py3 2022-02-24 13:34:14 +00:00
public.mk use unix line endings 2018-06-20 23:19:59 +00:00
pylintrc Use DEPS for all dependencies + add PRESUBMIT.py 2017-02-03 11:36:53 +00:00
README.chromium CpuId test FSMR - Fast Short Rep Movsb 2024-11-18 17:56:45 +00:00
README.md Update README.md and environment_variables.md for Arm 2024-09-20 00:29:33 +00:00
winarm.mk NV12 Copy, include scale_uv.h 2020-12-08 18:54:16 +00:00

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.