128 lines
4.5 KiB
Plaintext
128 lines
4.5 KiB
Plaintext
# Description:
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# OpenCV xcframework for video/image processing on iOS.
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licenses(["notice"]) # BSD license
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exports_files(["LICENSE"])
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load(
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"@build_bazel_rules_apple//apple:apple.bzl",
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"apple_static_xcframework_import",
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)
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load(
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"@//third_party:opencv_ios_source.bzl",
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"select_headers",
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"unzip_opencv_xcframework",
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)
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# Build opencv2.xcframework from source using a convenience script provided in
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# OPENCV sources and zip the xcframework. We only build the modules required by MediaPipe by specifying
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# the modules to be ignored as command line arguments.
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# We also specify the simulator and device architectures we are building for.
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# Currently we only support iOS arm64 (M1 Macs) and x86_64(Intel Macs) simulators
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# and arm64 iOS devices.
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# Bitcode and Swift support. Swift support will be added in when the final binary
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# for MediaPipe iOS Task libraries are built. Shipping with OPENCV built with
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# Swift support throws linker errors when the MediaPipe framework is used from
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# an iOS project.
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# When building on M1 Macs, cmake version cannot be higher than 3.24.0. This is
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# is mentioned in an open issue in the opencv github repo.
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genrule(
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name = "build_opencv_xcframework",
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srcs = glob(["opencv-4.5.3/**"]),
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outs = ["opencv2.xcframework.zip"],
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cmd = "&&".join([
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"$(location opencv-4.5.3/platforms/apple/build_xcframework.py) \
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--iphonesimulator_archs arm64,x86_64 \
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--iphoneos_archs arm64 \
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--without dnn \
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--without ml \
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--without stitching \
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--without photo \
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--without objdetect \
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--without gapi \
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--without flann \
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--disable PROTOBUF \
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--disable-bitcode \
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--disable-swift \
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--build_only_specified_archs \
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--out $(@D)",
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"cd $(@D)",
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"zip --symlinks -r opencv2.xcframework.zip opencv2.xcframework",
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]),
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)
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# Unzips `opencv2.xcframework.zip` built from source by `build_opencv_xcframework`
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# genrule and returns an exhaustive list of all its files including symlinks.
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unzip_opencv_xcframework(
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name = "opencv2_unzipped_xcframework_files",
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zip_file = "opencv2.xcframework.zip",
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)
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# Imports the files of the unzipped `opencv2.xcframework` as an apple static
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# framework which can be linked to iOS targets.
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apple_static_xcframework_import(
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name = "opencv_xcframework",
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visibility = ["//visibility:public"],
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xcframework_imports = [":opencv2_unzipped_xcframework_files"],
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)
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# Filters the headers for each platform in `opencv2.xcframework` which will be
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# used as headers in a `cc_library` that can be linked to C++ targets.
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select_headers(
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name = "opencv_xcframework_device_headers",
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srcs = [":opencv_xcframework"],
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platform = "ios-arm64",
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)
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select_headers(
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name = "opencv_xcframework_simulator_headers",
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srcs = [":opencv_xcframework"],
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platform = "ios-arm64_x86_64-simulator",
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)
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# `cc_library` that can be linked to C++ targets to import opencv headers.
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cc_library(
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name = "opencv",
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hdrs = select({
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"@//mediapipe:ios_x86_64": [
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":opencv_xcframework_simulator_headers",
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],
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"@//mediapipe:ios_sim_arm64": [
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":opencv_xcframework_simulator_headers",
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],
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"@//mediapipe:ios_arm64": [
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":opencv_xcframework_device_headers",
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],
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# A value from above is chosen arbitarily.
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"//conditions:default": [
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":opencv_xcframework_simulator_headers",
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],
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}),
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copts = [
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"-std=c++11",
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"-x objective-c++",
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],
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include_prefix = "opencv2",
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linkopts = [
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"-framework AssetsLibrary",
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"-framework CoreFoundation",
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"-framework CoreGraphics",
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"-framework CoreMedia",
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"-framework Accelerate",
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"-framework CoreImage",
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"-framework AVFoundation",
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"-framework CoreVideo",
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"-framework QuartzCore",
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],
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strip_include_prefix = select({
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"@//mediapipe:ios_x86_64": "opencv2.xcframework/ios-arm64_x86_64-simulator/opencv2.framework/Versions/A/Headers",
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"@//mediapipe:ios_sim_arm64": "opencv2.xcframework/ios-arm64_x86_64-simulator/opencv2.framework/Versions/A/Headers",
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"@//mediapipe:ios_arm64": "opencv2.xcframework/ios-arm64/opencv2.framework/Versions/A/Headers",
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# Random value is selected for default cases.
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"//conditions:default": "opencv2.xcframework/ios-arm64_x86_64-simulator/opencv2.framework/Versions/A/Headers",
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}),
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visibility = ["//visibility:public"],
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deps = [":opencv_xcframework"],
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)
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