[Buildroot] [git commit] package/opencv: add python support

[Buildroot] [git commit] package/opencv: add python support

[Thomas Petazzoni]

commit: http://git.buildroot.net/buildroot/commit/?id=c96fb31aa1fa1cd0ee7e4546c11d0a18a3bca044
branch: http://git.buildroot.net/buildroot/commit/?id=refs/heads/master

opencv_python module needs python-numpy because it uses some numpy
headers in this wrapper.

From its 2.4 release, OpenCV offers python bindings, but they required
most of the OpenCV modules to be enabled.

Since OpenCV-3.0.0, python bindings have been reworked:
- it now supports both python2 and python3
- only built modules supporting wrapped in python will be included in
  the bindings.

Signed-off-by: Samuel Martin <s.martin49@gmail.com>
Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Tested-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
---
 package/opencv/Config.in |   12 +++++++++++-
 package/opencv/opencv.mk |   33 +++++++++++++++++++++++++++++++--
 2 files changed, 42 insertions(+), 3 deletions(-)

diff --git a/package/opencv/Config.in b/package/opencv/Config.in
index 877ddda..576f667 100644
--- a/package/opencv/Config.in
+++ b/package/opencv/Config.in
@@ -85,7 +85,17 @@ config BR2_PACKAGE_OPENCV_LIB_PHOTO
 	  Include opencv_photo (computational photography) module into the OpenCV
 	  build.
 
-comment "opencv_python module requires numpy which is not yet available."
+config BR2_PACKAGE_OPENCV_LIB_PYTHON
+	bool "python"
+	depends on BR2_PACKAGE_PYTHON || BR2_PACKAGE_PYTHON3
+	depends on BR2_aarch64 || BR2_arm || BR2_armeb || BR2_i386 \
+		|| BR2_mips || BR2_mipsel || BR2_powerpc || BR2_powerpc64 \
+		|| BR2_sh || BR2_x86_64 # python-numpy
+	depends on !BR2_TOOLCHAIN_USES_UCLIBC || BR2_i386 || BR2_x86_64 # python-numpy
+	select BR2_PACKAGE_PYTHON_NUMPY
+	help
+	  Include opencv_python module into the OpenCV build.
+	  No python example is installed.
 
 config BR2_PACKAGE_OPENCV_LIB_SHAPE
 	bool "shape"
diff --git a/package/opencv/opencv.mk b/package/opencv/opencv.mk
index 7211c18..a43de0c 100644
--- a/package/opencv/opencv.mk
+++ b/package/opencv/opencv.mk
@@ -78,8 +78,6 @@ OPENCV_CONF_OPTS += \
 	-DBUILD_opencv_ml=$(if $(BR2_PACKAGE_OPENCV_LIB_ML),ON,OFF) \
 	-DBUILD_opencv_objdetect=$(if $(BR2_PACKAGE_OPENCV_LIB_OBJDETECT),ON,OFF) \
 	-DBUILD_opencv_photo=$(if $(BR2_PACKAGE_OPENCV_LIB_PHOTO),ON,OFF) \
-	-DBUILD_opencv_python2=OFF \
-	-DBUILD_opencv_python3=OFF \
 	-DBUILD_opencv_shape=$(if $(BR2_PACKAGE_OPENCV_LIB_SHAPE),ON,OFF) \
 	-DBUILD_opencv_stitching=$(if $(BR2_PACKAGE_OPENCV_LIB_STITCHING),ON,OFF) \
 	-DBUILD_opencv_superres=$(if $(BR2_PACKAGE_OPENCV_LIB_SUPERRES),ON,OFF) \
@@ -282,6 +280,37 @@ else
 OPENCV_CONF_OPTS += -DWITH_V4L=OFF -DWITH_LIBV4L=OFF
 endif
 
+ifeq ($(BR2_PACKAGE_OPENCV_LIB_PYTHON),y)
+ifeq ($(BR2_PACKAGE_PYTHON),y)
+OPENCV_CONF_OPTS += \
+	-DBUILD_opencv_python2=ON \
+	-DBUILD_opencv_python3=OFF \
+	-DPYTHON2_EXECUTABLE=$(HOST_DIR)/usr/bin/python2 \
+	-DPYTHON2_INCLUDE_PATH=$(STAGING_DIR)/usr/include/python$(PYTHON_VERSION_MAJOR) \
+	-DPYTHON2_LIBRARIES=$(STAGING_DIR)/usr/lib/libpython$(PYTHON_VERSION_MAJOR).so \
+	-DPYTHON2_NUMPY_INCLUDE_DIRS=$(STAGING_DIR)/usr/lib/python$(PYTHON_VERSION_MAJOR)/site-packages/numpy/core/include \
+	-DPYTHON2_PACKAGES_PATH=/usr/lib/python$(PYTHON_VERSION_MAJOR)/site-packages \
+	-DPYTHON2_NUMPY_VERSION=$(PYTHON_NUMPY_VERSION)
+OPENCV_DEPENDENCIES += python
+else
+OPENCV_CONF_OPTS += \
+	-DBUILD_opencv_python2=OFF \
+	-DBUILD_opencv_python3=ON \
+	-DPYTHON3_EXECUTABLE=$(HOST_DIR)/usr/bin/python3 \
+	-DPYTHON3_INCLUDE_PATH=$(STAGING_DIR)/usr/include/python$(PYTHON3_VERSION_MAJOR)m \
+	-DPYTHON3_LIBRARIES=$(STAGING_DIR)/usr/lib/libpython$(PYTHON3_VERSION_MAJOR)m.so \
+	-DPYTHON3_NUMPY_INCLUDE_DIRS=$(STAGING_DIR)/usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages/numpy/core/include \
+	-DPYTHON3_PACKAGES_PATH=/usr/lib/python$(PYTHON3_VERSION_MAJOR)/site-packages \
+	-DPYTHON3_NUMPY_VERSION=$(PYTHON_NUMPY_VERSION)
+OPENCV_DEPENDENCIES += python3
+endif
+OPENCV_DEPENDENCIES += python-numpy
+else
+OPENCV_CONF_OPTS += \
+	-DBUILD_opencv_python2=OFF \
+	-DBUILD_opencv_python3=OFF
+endif
+
 # Installation hooks:
 define OPENCV_CLEAN_INSTALL_DOC
 	$(RM) -fr $(TARGET_DIR)/usr/share/OpenCV/doc