Every time I try to use OpenCV on an Apple platform, I lose a few days to yak shaving trying to get it to compile and including it in my project. The build process is convoluted and time-consuming -- there is no way to turn it into a Swift Package.
But now, one can create binary packages in SPM.
So here it is.
To use it, just include the package
https://github.com/r0ml/OpenCV.git
The build process (see build.sh) enables both ObjC++ and Swift.
In your project, you will need to change the setting for C++ and Objective-C interoperability to C++/Objective-C++.
If you wish to build your own, clone this repo (git clone --recurse-submodules).
You will need cmake installed (brew install cmake).
You will need XCode command line tools installed (xcode-select --install).
You will need to create a version of python called python installed at /usr/local/bin .
(The build scripts want an executable called python in the PATH.
Unfortunately, if you create a link to /usr/bin/python3, it will not work! )
I have included a script called python in this repo which must be copied or moved to /usr/local/bin/python.
Then run
./prepatch.sh
which fixes a problem with an #include statement in opencv.
Then run
./build.sh
Because I am using OpenCV as the name of the framework, rather than opencv2, many of the includes in the headers fail to resolve properly. The following patch fixes that.
Run
./postpatch.sh
The built xcframework should be located at build_xcframework/OpenCV.xcframework.
After building the xcframework, one needs to
- run
./postbuild.sh xxxwhere xxx is the new version number of the updated package. This will update the version number in the download URL, create the release zip file, and update the checksum in Package.swift - commit and push the changes
- create a new release on github using the version number from the
postbuild.shstep - upload the
OpenCV.framework.zipin build_xcframework as the asset in the release
If adding this SPM package seems to take way too long, you might try using the alternative package at https://github.com/r0ml/JustTheBinary. This contains a binary package with the same framework as available here, except (as the name suggests�) it does not include all the stuff required to rebuild the framework. It should load faster.
Copyright (c) 1868 Charles Babbage
Found amongst his effects by r0ml