dnl Copyright (C) 2007-2024  CEA, EDF, OPEN CASCADE
dnl
dnl This library is free software; you can redistribute it and/or
dnl modify it under the terms of the GNU Lesser General Public
dnl License as published by the Free Software Foundation; either
dnl version 2.1 of the License, or (at your option) any later version.
dnl
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dnl but WITHOUT ANY WARRANTY; without even the implied warranty of
dnl MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
dnl Lesser General Public License for more details.
dnl
dnl You should have received a copy of the GNU Lesser General Public
dnl License along with this library; if not, write to the Free Software
dnl Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
dnl
dnl See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
dnl

dnl  File   : check_OpenCV.m4
dnl  Author : Renaud NEDELEC, Open CASCADE S.A.S (renaud.nedelec@opencascade.com)
dnl
AC_DEFUN([CHECK_OPENCV],[

AC_REQUIRE([AC_PROG_CXX])dnl
AC_REQUIRE([AC_PROG_CXXCPP])dnl

AC_CHECKING([for OPENCV product])

AC_LANG_SAVE
AC_LANG_C

OPENCV_INCLUDES=""
OPENCV_LIBS=""

AC_ARG_WITH([opencv],
        [  --with-opencv=DIR       root directory path of OPENCV installation])

opencv_ok=no

if test "$with_opencv" != "no" ; then
  if test "$with_opencv" == "yes" || test "$with_opencv" == "auto"; then
    OPENCV_HOME=""
  else
    OPENCV_HOME="$with_opencv"
  fi

  if test "$OPENCV_HOME" == "" ; then
    if test "x$OPENCV_INSTALL_DIR" != "x" ; then
      OPENCV_HOME=$OPENCV_INSTALL_DIR
    fi
  fi

  if test "x$OPENCV_HOME" != "x"; then

    LOCAL_INCLUDES="-I$OPENCV_HOME/include -I$OPENCV_HOME/include/opencv"
    LOCAL_LIBS="-L$OPENCV_HOME/lib -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_flann"

    CPPFLAGS_old="$CPPFLAGS"
    CXXFLAGS_old="$CXXFLAGS"
    CPPFLAGS="$LOCAL_INCLUDES $CPPFLAGS"
    CXXFLAGS="$LOCAL_INCLUDES $CXXFLAGS"

    AC_MSG_CHECKING([for OPENCV library])

    LDFLAGS_old="$LDFLAGS"
    LDFLAGS="-L. $LOCAL_LIBS $LDFLAGS"

    LDFLAGS="$LDFLAGS_old"
    
    opencv_ok=yes

    AC_MSG_RESULT([$opencv_ok])

    CPPFLAGS="$CPPFLAGS_old"
    CXXFLAGS="$CXXFLAGS_old"

  fi
fi

if test "x$opencv_ok" == xno ; then
  AC_MSG_RESULT([for OPENCV: no])
  AC_MSG_WARN([OPENCV includes or libraries are not found or are not properly installed])
  AC_MSG_WARN([Use --with-opencv option to define OPENCV installation.])
else
  OPENCV_INCLUDES=$LOCAL_INCLUDES
  OPENCV_LIBS=$LOCAL_LIBS
  AC_MSG_RESULT([for OPENCV: yes])
fi

AM_CONDITIONAL(WITH_OPENCV, [test x"$opencv_ok" = xyes])

AC_SUBST(OPENCV_INCLUDES)
AC_SUBST(OPENCV_LIBS)

AC_LANG_RESTORE

])dnl