dartcv

C wrappers for opencv, used for opencv_dart

build

1. Install dependencies

• Windows: Install Visual Studio 2019 or Later, cmake
• Linux: Ubuntu as example

sudo apt-get install build-essential libgtk-3-dev cmake

• macOS: XCode, cmake

2. clone this repo

git clone https://github.com/rainyl/dartcv.git
cd dartcv

3. compile

• Windows:

mkdir -Force build && cd build
cmake -S .. `
  -DFFMPEG_USE_STATIC_LIBS=OFF `
  -DCMAKE_INSTALL_PREFIX=install `
  -DDARTCV_ENABLE_INSTALL=ON `
  -DCMAKE_BUILD_TYPE=Release `
  -DDARTCV_WITH_VIDEOIO=ON `
  -DDARTCV_WITH_HIGHGUI=ON

cmake --build . --config Release --target install

• Linux

mkdir -p build && cd build
cmake -S .. \
  -DCMAKE_INSTALL_PREFIX=install \
  -DDARTCV_WITH_VIDEOIO=ON \
  -DDARTCV_ENABLE_INSTALL=ON \
  -DCMAKE_BUILD_TYPE=Release

cmake --build . --config Release --target install

• android

If you want to use your own NDK instead of conan maintained one, please set ANDROID_NDK_HOME or ANDROID_NDK_ROOT environment variable, e.g., export ANDROID_NDK_HOME=/opt/android-ndk-r26c

mkdir -p build && cd build
cmake -S .. \
  -DCMAKE_TOOLCHAIN_FILE=$ANDROID_NDK_HOME/build/cmake/android.toolchain.cmake \
  -DANDROID_USE_LEGACY_TOOLCHAIN_FILE=False \
  -DANDROID_PLATFORM=android-24 \
  -DCMAKE_BUILD_TYPE=Release \
  -DANDROID_STL=c++_static \
  -DANDROID_ARM_NEON=ON \
  -DDARTCV_WITH_VIDEOIO=ON \
  -DDARTCV_ENABLE_INSTALL=ON \
  -DANDROID_ABI="armeabi-v7a" \
  -DCMAKE_INSTALL_PREFIX="install"

cmake --build . --config Release --target install

• MacOS: use DartCvMacOS from cocoapods or build .dylib using:

mkdir -p build && cd build
cmake -S .. \
  -DCMAKE_TOOLCHAIN_FILE=../cmake/ios.toolchain.cmake \
  -DPLATFORM=MAC \
  -DDEPLOYMENT_TARGET="10.15" \
  -DENABLE_BITCODE=OFF \
  -DENABLE_ARC=OFF \
  -DENABLE_VISIBILITY=OFF \
  -DCMAKE_INSTALL_PREFIX=install \
  -DDARTCV_WITH_VIDEOIO=ON \
  -DDARTCV_WITH_HIGHGUI=ON \
  -DDARTCV_ENABLE_INSTALL=ON \
  -DCMAKE_BUILD_TYPE=Release

cmake --build . --config Release --target install

• ios: use DartCvIOS from cocoapods

4. test

• Set DARTCV_LIB_PATH environment variable to the path of the compiled dynamic library, e.g., export DARTCV_LIB_PATH=pwd/linux/libdartcv.so or $ENV:DARTCV_LIB_PATH=$PWD\windows\dartcv.dll
• or append the lib path to the library search path of your system
• If you want to test using vscode, add above variable to "dart.env" in settings.json

Note

• windows: use Visual Studio 2019 and above
• more options refer to CMakeLists.txt
• set -DDARTCV_DISABLE_DOWNLOAD_OPENCV=ON to disable download prebuilt opencv sdk from opencv.full, you need to explicitly set OpenCV_DIR
• set OPENCV_VERSION to change the version of opencv.full, e.g., -DOPENCV_VERSION="4.10.0+9"
• set DARTCV_CACHE_DIR to cache opencv sdk and avoid downloading every time
• videoio, highgui requires FFMPEG, they were attached in the libopencv downloaded from opencv.full