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Frank Barchard 8dabf898ee Avoid signed int overflow in scale functions using uint32_t 
Use uint32_t for the 16.16 fixed-point row coordinate (uy) and max_y
in the vertical loops of ScalePlane*, ScaleUV*, and the Up2 linear
helpers. With src_height up to 32768, (src_height << 16) and y += dy
overflow signed int (e.g. for dst_height == 2 the post-read step
reaches 5/4 * (src_height << 16), which exceeds INT_MAX for any
src_height >= 26215, and for kFilterNone the final increment after
the last row reaches (src_height << 16) + dy / 2). uint32_t cannot
overflow for these ranges (uy <= 0xFFFF0000) and stays in a single
32-bit register on 32-bit targets (x86, Arm, WASM), unlike int64_t.

Undo the interim +/-32767 height cap from https://crrev.com/c/8524280
so ScalePlane, ScalePlane_16, UVScale, and UVScale_16 accept
|src_height| <= 32768 again.

ScaleUVBilinearUp2 and ScaleUVBilinearUp2_16 take ptrdiff_t strides
so 2 * dst_stride does not overflow int for images over 2 GB.

ARGBScale, ARGBScaleClip, and UVScale_16 reject |src_width| > 32768
and |src_height| > 32768, and ScalePlane, ScalePlane_16, and
ScaleSlope avoid FixedDiv(32768, 1) overflow when dst_width == 1 or
dst_height == 1.

Bug: chromium:531172025
Test: libyuv_unittest --gtest_filter=*ScalePlaneOversizeHeight*:*ScalePlaneBoxMaxSrcHeight*:*ScaleLargeImageOver2GB*:*ARGBScale*
Change-Id: Ica2e05d7dfe94f81c6631c587f1ff46c2ad44735
2026-10-13 19:09:47 -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 Fix remaining inline asm input/output constraints and clobbers 2026-10-13 11:20:48 -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 Avoid signed int overflow in scale functions using uint32_t 2026-10-13 19:09:47 -07:00
tools_libyuv Remove libyuv dependency on base/ 2025-01-08 09:04:21 -08:00
unit_test Avoid signed int overflow in scale functions using uint32_t 2026-10-13 19:09:47 -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] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
Android.mk [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -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] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
CM_linux_packages.cmake Use grep extended regex for version 2024-11-13 02:11:17 +00:00
CMakeLists.txt [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -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 Fix missing inline asm register clobbers 2026-10-08 14:44:23 -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] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -07:00
LICENSE Update Copyright notice to follow new chromium conventions. 2012-08-08 19:04:24 +00:00
linux.mk [libyuv] Optimize ARGBRotate for Intel SSE2, AVX2, and AVX-512 2026-10-08 16:20:46 -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.