add libyuv package (#32)

* add libyuv package

* update libyuv to upstream 1922

libyuv/build.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null && pwd)"
+cd "$DIR"
+
+VERSION="6067afde563c3946eebd94f146b3824ab7a97a9c"
+INSTALL_DIR="$DIR/libyuv/install"
+VERSION_FILE="$INSTALL_DIR/VERSION"
+
+# Idempotent: skip if already built at this source revision.
+if [ -f "$INSTALL_DIR/lib/libyuv.a" ] && [ -f "$VERSION_FILE" ] && [ "$(cat "$VERSION_FILE")" = "$VERSION" ]; then
+  echo "libyuv already present, skipping build."
+  exit 0
+fi
+
+NJOBS="$(nproc 2>/dev/null || sysctl -n hw.ncpu 2>/dev/null || echo 2)"
+
+if [ ! -d "libyuv-src/.git" ]; then
+  git clone https://chromium.googlesource.com/libyuv/libyuv libyuv-src
+fi
+
+git -C libyuv-src fetch --force origin
+git -C libyuv-src checkout --force "$VERSION"
+
+BUILD_DIR="$DIR/build/build"
+rm -rf "$DIR/build"
+mkdir -p "$BUILD_DIR"
+
+cmake -S "$DIR/libyuv-src" -B "$BUILD_DIR" \
+  -DCMAKE_BUILD_TYPE=MinSizeRel \
+  -DCMAKE_INTERPROCEDURAL_OPTIMIZATION=OFF \
+  -DCMAKE_POSITION_INDEPENDENT_CODE=ON \
+  -DBUILD_SHARED_LIBS=OFF \
+  -DCMAKE_C_FLAGS="-fPIC" \
+  -DCMAKE_CXX_FLAGS="-fPIC"
+
+cmake --build "$BUILD_DIR" -j"$NJOBS"
+
+LIBYUV_STATIC="$(find "$BUILD_DIR" -name "libyuv.a" -type f | head -n 1)"
+if [ -z "$LIBYUV_STATIC" ]; then
+  echo "libyuv.a not found in build output" >&2
+  exit 1
+fi
+
+rm -rf "$INSTALL_DIR"
+mkdir -p "$INSTALL_DIR"/{lib,include}
+cp "$LIBYUV_STATIC" "$INSTALL_DIR/lib/libyuv.a"
+cp -r "$DIR/libyuv-src/include/." "$INSTALL_DIR/include/"
+echo "$VERSION" > "$VERSION_FILE"
+
+# Keep workspace small and deterministic across builds.
+rm -rf "$DIR/libyuv-src" "$DIR/build"
+
+echo "Installed libyuv to $INSTALL_DIR"
+du -sh "$INSTALL_DIR"

libyuv/libyuv/__init__.py

@@ -0,0 +1,11 @@
+import os
+
+DIR = os.path.join(os.path.dirname(__file__), "install")
+LIB_DIR = os.path.join(DIR, "lib")
+INCLUDE_DIR = os.path.join(DIR, "include")
+
+
+def smoketest():
+  assert os.path.isfile(os.path.join(LIB_DIR, "libyuv.a")), "libyuv.a not found"
+  assert os.path.isfile(os.path.join(INCLUDE_DIR, "libyuv.h")), "libyuv.h not found"
+  assert os.path.isfile(os.path.join(INCLUDE_DIR, "libyuv", "version.h")), "libyuv/version.h not found"

libyuv/pyproject.toml

@@ -0,0 +1,15 @@
+[build-system]
+requires = ["setuptools>=64", "wheel"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "libyuv"
+version = "1922.0"
+description = "libyuv image processing library (static build)"
+requires-python = ">=3.8"
+
+[tool.setuptools.packages.find]
+include = ["libyuv*"]
+
+[tool.setuptools.package-data]
+libyuv = ["install/**/*"]

libyuv/setup.py

@@ -0,0 +1,61 @@
+import os
+import platform
+import subprocess
+
+from setuptools.command.build_py import build_py
+
+try:
+  from wheel.bdist_wheel import bdist_wheel
+except ImportError:
+  bdist_wheel = None
+
+
+class BuildLibyuv(build_py):
+  """Run build.sh to compile libyuv before collecting package data."""
+
+  def run(self):
+    pkg_dir = os.path.dirname(os.path.abspath(__file__))
+    marker = os.path.join(pkg_dir, "libyuv", "install", "lib", "libyuv.a")
+
+    if not os.path.exists(marker):
+      build_script = os.path.join(pkg_dir, "build.sh")
+      subprocess.check_call(["bash", build_script], cwd=pkg_dir)
+
+    super().run()
+
+
+cmdclass = {"build_py": BuildLibyuv}
+
+if bdist_wheel is not None:
+
+  class PlatformWheel(bdist_wheel):
+    """Produce a platform-specific, Python-version-agnostic wheel."""
+
+    def finalize_options(self):
+      super().finalize_options()
+      self.root_is_pure = False
+
+    def get_tag(self):
+      system = platform.system()
+      machine = platform.machine()
+
+      if system == "Linux":
+        plat = f"linux_{machine}"
+      elif system == "Darwin":
+        plat = "macosx_11_0_arm64"
+      else:
+        plat = f"{system.lower()}_{machine}"
+
+      return "py3", "none", plat
+
+  cmdclass["bdist_wheel"] = PlatformWheel
+
+
+def setup():
+  from setuptools import setup as _setup
+
+  _setup(cmdclass=cmdclass)
+
+
+if __name__ == "__main__":
+  setup()

pyproject.toml

@@ -8,6 +8,7 @@ members = [
   "gcc-arm-none-eabi",
   "git-lfs",
   "libjpeg",
+  "libyuv",
   "ncurses",
   "openssl3",
   "python3-dev",