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# Maintainer (Arch): Ray Rashif <schiv@archlinux.org>
# Contributor (Arch): Tobias Powalowski <tpowa@archlinux.org>
# Contributor (Hyperbola): André Silva <emulatorman@hyperbola.info>
# Contributor (Hyperbola): Márcio Silva <coadde@hyperbola.info>
# Maintainer: Omar Vega Ramos <ovruni@gnu.org.pe>

pkgbase=opencv
pkgname=opencv
pkgver=4.0.0
pkgrel=4
pkgrel+=.par1
pkgdesc="Free Computer Vision Library, without nonfree SIFT and SURF algorithms, nonfree Milky icons and lena images"
arch=(x86_64)
arch+=(i686  armv7h)
license=(BSD)
url="http://opencv.org/"
depends=(intel-tbb openexr gst-plugins-base libdc1394 cblas lapack libgphoto2 jasper ffmpeg)
makedepends=(cmake python-numpy python-setuptools mesa eigen hdf5 lapacke gtk3 vtk glew)
optdepends=('opencv-samples: samples'
            'gtk3: for the HighGUI module'
            'vtk: for the viz module'
            'hdf5: support for HDF5 format'
            'opencl-icd-loader: For coding with OpenCL'
            'python-numpy: Python 3 interface')
mksource=("$pkgbase-$pkgver.zip::https://github.com/opencv/opencv/archive/$pkgver.zip"
          "opencv_contrib-$pkgver.tar.gz::https://github.com/opencv/opencv_contrib/archive/$pkgver.tar.gz")
source=("https://repo.parabola.nu/other/$pkgname-libre/$pkgname-libre-$pkgver.zip")
mksha256sums=('86fd08fc02893e05e2944fa7b0daa7d02643232450f020b475e1b2f24587b99a'
              '4fb0681414df4baedce6e3f4a01318d6f4fcde6ee14854d761fd4e397a397763')
sha256sums=('71fd849ccbf648876bb8288f05591a5314082761a4028a4953b4cccc81f325e3')

mksource() {
  cd "$srcdir/opencv_contrib-$pkgver"

  # remove nonfree SIFT and SURF algorithms that are patented in some countries and have some other limitations on the use
  rm -v modules/xfeatures2d/src/{sift,surf}.cpp

  cd "$srcdir/$pkgname-$pkgver"

  # remove nonfree Milky icons
  rm -rv modules/highgui/src/files_Qt/Milky

  # remove nonfree lena.png and lena.jpg images
  rm -v $(find . -iname '*lena*')
}

prepare() {
  cd "$srcdir/opencv_contrib-$pkgver"

  # remove nonfree SIFT and SURF references
  rm -rv modules/xfeatures2d

  mkdir -p ../build
}

build() {
  cd build

  # SSE only available from Pentium 3 onwards (i686 is way older)
  # SSE only available x86 hardware and ARM uses NEON
  case "$CARCH" in
    i686) extra='-DCPU_BASELINE_DISABLE=SSE,SSE2' ;;
    x86_64) extra='-DCPU_BASELINE_DISABLE=SSE3 -DCPU_BASELINE_REQUIRE=SSE2' ;;
    *) extra='' ;;
  esac

  # 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 ../$pkgname-$pkgver \
    -DWITH_OPENCL=ON \
    -DWITH_OPENGL=ON \
    -DWITH_TBB=ON \
    -DOpenGL_GL_PREFERENCE=GLVND \
    -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 \
    -DCMAKE_INSTALL_LIBDIR=lib \
    $extra \
    -DOPENCV_EXTRA_MODULES_PATH="$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
#    -DWITH_IPP=OFF
  make
}

package_opencv() {
  cd build
  make DESTDIR="$pkgdir" install

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

  # separate samples package
  cd "$pkgdir"/usr/share
  rm -r opencv4/samples

  # install missing headers https://github.com/opencv/opencv/issues/13201
  for _module in imgcodecs videoio photo; do
    cp -r "$srcdir"/$pkgname-$pkgver/modules/$_module/include/opencv2/$_module/legacy \
      "$pkgdir"/usr/include/opencv4/opencv2/$_module
  done
}