# Maintainer: Antonio Rojas <arojas@archlinux.org>
# Contributor: Ray Rashif <schiv@archlinux.org>
# Contributor: Tobias Powalowski <tpowa@archlinux.org>

# ALARM: Kevin Mihelich <kevin@archlinuxarm.org>
#  - remove -DCPU_BASELINE_{ENABLE,DISABLE} flags for SSE
#  - link with libatomic on v5/v6

pkgbase=opencv
pkgname=(opencv opencv-samples python-opencv)
pkgver=4.5.3
pkgrel=1
pkgdesc="Open Source Computer Vision Library"
arch=(x86_64)
license=(BSD)
url='https://opencv.org/'
depends=(tbb openexr gst-plugins-base libdc1394 cblas lapack libgphoto2 openjpeg2 ffmpeg)
makedepends=(cmake python-numpy python-setuptools mesa eigen hdf5 lapacke qt5-base vtk glew ant java-environment)
optdepends=('opencv-samples: samples'
            'vtk: for the viz module'
            'glew: for the viz module'
            'qt5-base: for the HighGUI module'
            'hdf5: for the HDF5 module'
            'opencl-icd-loader: For coding with OpenCL'
            'java-runtime: Java interface')
source=(https://github.com/opencv/opencv/archive/$pkgver/$pkgname-$pkgver.tar.gz
        https://github.com/opencv/opencv_contrib/archive/$pkgver/opencv_contrib-$pkgver.tar.gz
        opencv-lapack-3.10.patch
        0001-link-with-libatomic.patch)
sha256sums=('77f616ae4bea416674d8c373984b20c8bd55e7db887fd38c6df73463a0647bab'
            '73da052fd10e73aaba2560eaff10cc5177e2dcc58b27f8aedf7c649e24c233bc'
            'f83c64f2731a39910d0d4a48898dd04e4aca5c22f746b7b0ead003992ae11199'
            '3376bc87ac7404c6f396f1bee03b76ab0e5cb18829f535bbc97cef71d28ab168')


prepare() {
  patch -d $pkgname-$pkgver -p1 < opencv-lapack-3.10.patch # Fix build with LAPACK 3.10
  cd $pkgname-$pkgver
  if [[ $CARCH == "arm" || $CARCH == "armv6h" ]]; then
    patch -p1 -i ../0001-link-with-libatomic.patch
  fi
}

build() {
  export JAVA_HOME="/usr/lib/jvm/default"
  # cmake's FindLAPACK doesn't add cblas to LAPACK_LIBRARIES, so we need to specify them manually
  _pythonpath=`python -c "from sysconfig import get_path; print(get_path('platlib'))"`
  cmake -B build -S $pkgname-$pkgver \
    -DWITH_OPENCL=ON \
    -DWITH_OPENGL=ON \
    -DWITH_TBB=ON \
    -DWITH_VULKAN=ON \
    -DWITH_QT=ON \
    -DBUILD_WITH_DEBUG_INFO=OFF \
    -DBUILD_TESTS=OFF \
    -DBUILD_PERF_TESTS=OFF \
    -DBUILD_EXAMPLES=ON \
    -DINSTALL_C_EXAMPLES=ON \
    -DINSTALL_PYTHON_EXAMPLES=ON \
    -DCMAKE_INSTALL_PREFIX=/usr \
    -DOPENCV_EXTRA_MODULES_PATH="$srcdir/opencv_contrib-$pkgver/modules" \
    -DOPENCV_SKIP_PYTHON_LOADER=ON \
    -DOPENCV_PYTHON3_INSTALL_PATH=$_pythonpath \
    -DLAPACK_LIBRARIES="/usr/lib/liblapack.so;/usr/lib/libblas.so;/usr/lib/libcblas.so" \
    -DLAPACK_CBLAS_H="/usr/include/cblas.h" \
    -DLAPACK_LAPACKE_H="/usr/include/lapacke.h" \
    -DOPENCV_GENERATE_PKGCONFIG=ON \
    -DOPENCV_ENABLE_NONFREE=ON \
    -DOPENCV_JNI_INSTALL_PATH=lib \
    -DOPENCV_GENERATE_SETUPVARS=OFF \
    -DEIGEN_INCLUDE_PATH=/usr/include/eigen3
  cmake --build build
}

package_opencv() {
  DESTDIR="$pkgdir" cmake --install build

  # install license file
  install -Dm644 $pkgbase-$pkgver/LICENSE -t "$pkgdir"/usr/share/licenses/$pkgname

  # separate samples package
  mv "$pkgdir"/usr/share/opencv4/samples "$srcdir"

  # Add java symlinks expected by some binary blobs
  ln -sr "$pkgdir"/usr/share/java/{opencv4/opencv-${pkgver//./},opencv}.jar
  ln -sr "$pkgdir"/usr/lib/{libopencv_java${pkgver//./},libopencv_java}.so

  # Split Python bindings
  rm -r "$pkgdir"/usr/lib/python3*
}

package_opencv-samples() {
  pkgdesc+=" (samples)"
  depends=("opencv=$pkgver")
  unset optdepends

  mkdir -p "$pkgdir"/usr/share/opencv4
  mv samples "$pkgdir"/usr/share/opencv4

  # install license file
  install -Dm644 $pkgbase-$pkgver/LICENSE -t "$pkgdir"/usr/share/licenses/$pkgname
}

package_python-opencv() {
  pkgdesc="Python bindings for OpenCV"
  depends=(python-numpy opencv vtk glew qt5-base hdf5)
  unset optdepends

  DESTDIR="$pkgdir" cmake --install build/modules/python3

  # install license file
  install -Dm644 $pkgbase-$pkgver/LICENSE -t "$pkgdir"/usr/share/licenses/$pkgname
}