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Darren Hsieh 873eaa3bbf [RVV] Enable Scale{ARGB,UV}RowDown{2,4,EVEN}_RVV 
Run on SiFive internal FPGA:

Test case               RVV function				Speedup
I444ScaleDownBy3_Box	ScaleAddRow_RVV+ScaleAddCols(scalar)	2.8
ARGBScaleDownBy2_None	ScaleARGBRowDown2_RVV		        2.2
ARGBScaleDownBy2_Linear	ScaleARGBRowDown2Linear_RVV		5.0
ARGBScaleDownBy2_Box	ScaleARGBRowDown2Box_RVV		4.3
ARGBScaleDownBy4_None	ScaleARGBRowDownEven_RVV		1.2
ARGBScaleDownBy8_Box	ScaleARGBRowDownEvenBox_RVV		3.2
ARGBScaleDownBy4_Box	ScaleARGBRowDown2Box_RVV		4.5
I444ScaleDownBy2_None	ScaleRowDown2_RVV			5.8
I444ScaleDownBy2_Linear	ScaleRowDown2Linear_RVV			6.1
I444ScaleDownBy2_Box	ScaleRowDown2Box_RVV			5.0
I444ScaleDownBy4_None	ScaleRowDown4_RVV			3.6
I444ScaleDownBy4_Box	ScaleRowDown4Box_RVV			3.5
UVScaleDownBy2_None	ScaleUVRowDown2_RVV			5.8
UVScaleDownBy2_Linear	ScaleUVRowDown2Linear_RVV		5.6
UVScaleDownBy2_Box	ScaleUVRowDown2Box_RVV			4.1
UVScaleDownBy4_None	ScaleUVRowDown4_RVV			1.7
UVScaleDownBy4_Box	ScaleUVRowDown2Box_RVV			4.5
						avg-speedup:    4

Note: Specialize ScaleUVRowDown with step_size=4 by ScaleUVRowDown4_RVV.

Bug: libyuv:956
Change-Id: If9604a6aadf681193f282507602c57c726332202
Signed-off-by: Darren Hsieh <darren.hsieh@sifive.com>
Reviewed-on: https://chromium-review.googlesource.com/c/libyuv/libyuv/+/4601684
Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>
2023-06-13 00:40:39 +00:00
build_overrides Define enable_safe_libcxx in build_overrides/build.gni. 2023-05-03 06:08:40 +00:00
docs Remove stale Android NDK and fix docs [2/2] 2023-06-07 21:39:59 +00:00
include [RVV] Enable Scale{ARGB,UV}RowDown{2,4,EVEN}_RVV 2023-06-13 00:40:39 +00:00
infra/config Use walleye instead of bullhead 2023-06-01 15:43:00 +00:00
riscv_script Fix compile error for riscv scalar & simplify cmake cross build flow 2023-05-04 18:09:00 +00:00
source [RVV] Enable Scale{ARGB,UV}RowDown{2,4,EVEN}_RVV 2023-06-13 00:40:39 +00:00
tools_libyuv Remove stale Android NDK and fix docs [2/2] 2023-06-07 21:39:59 +00:00
unit_test FP16 to FP32 float conversion row function 2023-06-07 00:02:40 +00:00
util yuvconstants.c: fix double->float conv warnings 2023-05-09 18:50:29 +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 Android.bp: Add -DLIBYUV_UNLIMITED_DATA flag 2023-06-01 19:25:27 +00:00
Android.mk RGBScale function using 3 steps: RGB24ToARGB, ARGBScale, ARGBToRGB24 2022-03-19 01:44:06 +00:00
AUTHORS Fix compile errors for ARM targets when libyuv_use_neon = false 2022-05-13 10:12:38 +00:00
BUILD.gn Add RVV files to Android and GN builds 2023-05-09 15:31:51 +00:00
cleanup_links.py Update PRESUBMIT, cleanup_links and autoroller to py3 2022-02-24 13:34:14 +00:00
CM_linux_packages.cmake Reduce cmake verbosity and update min version 2022-08-03 06:59:54 +00:00
CMakeLists.txt Fix compile error for riscv scalar & simplify cmake cross build flow 2023-05-04 18:09:00 +00:00
codereview.settings [infra] remove no longer supported git cl upload setting. 2021-04-28 12:47:52 +00:00
DEPS [Fuchsia] Replace downloading gn SDK with core SDK 2023-06-12 19:45:55 +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 Add RVV files to Android and GN builds 2023-05-09 15:31:51 +00:00
libyuv.gyp Add libyuv.gyp build files 2022-03-21 23:48:16 +00:00
libyuv.gypi Add libyuv.gyp build files 2022-03-21 23:48:16 +00:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
linux.mk RGBScale function using 3 steps: RGB24ToARGB, ARGBScale, ARGBToRGB24 2022-03-19 01:44:06 +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 Fix tidy warning that uint32_t dither4 should not be const 2023-06-02 00:42:02 +00:00
README.md Add RAWToARGBRow_RVV,RAWToRGBARow_RVV,RAWToRGB24Row_RVV 2023-04-07 18:45:08 +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 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.