Add Highway SIMD acceleration to ImageBufAlgo [add, sub, mul, div, mad, resample]#4994

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ssh4net wants to merge 70 commits intoAcademySoftwareFoundation:mainfrom

Commits on Feb 24, 2026

Add Google Highway SIMD acceleration to ImageBufAlgo
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Simplify CMake hwy option
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Revert "Simplify CMake hwy option"
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Update CMakeLists.txt

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Update src/cmake/externalpackages.cmake

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Update src/libOpenImageIO/imagebufalgo_addsub.cpp

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Update platform.h
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Update imagebufalgo_addsub.cpp
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Update platform.h
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Refactor HWY per-pixel ops and add strided ROI fallback tests
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Optimize SIMD for RGB ROI on RGBA images
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Add HWY helpers for RGBA-with-RGB ROI
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docs: fix missing docs for `OIIO:attribute()` and `OIIO::getattribute()` (#4987)

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deps: Test against libraw 0.21.5 (#4988)

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feat(sgi): Implement RLE encoding support for output (#4990)

jessey-git
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docs: Update CHANGES (#4991)

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deps: libheif 1.21 support (#4992)

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perf: IBA::resample improvements to speed up 20x or more (#4993)

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ci/deps: Freetype adjustments (#4999)

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ci: Speed up macos15 intel variant by not installing Qt (#4998)

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ci: don't run non-wheel workflows when only pyproject.toml changes (#4997)

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fix(build): Fix building on OpenBSD (#5001)

brad0
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admin: Refine PR template to give more visual separation (#4995)

lgritz
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build: Fix HARDENING build options (#4996)

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test: Add new ref image for jpeg test (#5007)

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docs: Remove outdated/wrong description in INSTALL.md (#5008)

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ci: Windows runners switched which python version they had (#5010)

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ci: test against libraw 0.22 for 'latest' test variants (#5009)

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fix: several bug fixes related to internal use of image_span (#5004)

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build: Use libheif exported config if available (#5012)

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build: fully disable tests when their required dependencies are missing (#5005)

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fix(heif): Can not output AVIF when libheif has no HEVC support (#5013)

brechtvl
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fix(webp): Use correct resolution limits for WebpOutput::open (#5016)

jessey-git
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api: IBA::make_texture now honors "maketx:threads" hint (#5014)

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api(ImageBuf): IB::localpixels_as_[writable_]byte_image_span (#5011)

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fix(heif): Error saving multiple images with different bit depths (#5018)

brechtvl
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feat(heif): Add IOProxy for input and output (#5017)

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fix(webp): Missing oiio:UnassociatedAlpha on input (#5020)

brechtvl
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build(ocio): bump build ver to 2.5.1 (#5022)

zachlewis
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ci: lock bleeding edge to pybind11 latest version (#5024)

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feat(iv): flip, rotate and save image (#5003)

vangeliq
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CHANGES udpates (#5028)

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testing: Adjust test comparision thresholds for Mac ARM (#5026)

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fix: conform certain attrib names "exif:*" to our "Exif:*" convention (#5025)

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fix(win): `oiiotool --buildinfo` misreported platform on MSVS (#5027)

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testing: Add testsuite/heif ref output for libheif 1.21 + avif support (#5031)

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cleanup: remove left over tile emulation code for various formats (#5029)

jessey-git
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api: OIIO_CONTRACT_ASSERT and other hardening improvements (#5006)

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ci: Don't install OpenCV on Mac Intel job variant (#5032)

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fix(bmp): detect corrupt files where palette doesn't match bpp (#5030)

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fix(tiff): Fix TIFF output crash for multi-count Exif metadata (#5035)

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build: Raise fmt auto-build version to 12.1, handle Windows flags (#5039)

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fix(tiff): Improve TIFF robustness for non-matching tag/metadata types (#5036)

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fix: gamma precision (#5038)

adskWangl
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ci: Turn off nightly workflows for user forks (#5042)

lgritz
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feat(heif): Monochrome channel read and write support, fix crash (#5043)

brechtvl
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fix(tiff): Correctly read TIFF EXIF fields for ExifVersion and FlashPixVersion (#5045)

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fix(oiiotool): Fix expression BOTTOM when there are exactly two images (#5046)

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build: self-builder logic fixes for deep vs shallow clones (#5034)

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test: imageinout_test: add benchmark of read and write speed vs tile size (#5037)

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build: Remove support for deprecated Intel icc compiler (#5040)

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build(deps): Raise minimum fmt library version to 9.0 (#5041)

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ci: temporarily disable python stub checking (#5061)

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fix: address fmath.h warning with ispow2 (#5033)

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jxl: Extending JXL CICP support to include P3 / color primaries 12 (#5054)

shanesmith-dwa
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clang-format
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Remove duplicated resample_deep function
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clang-format fix
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clang-format fix
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weird clang-format fix
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