Added build file for ios opencv from sources

2023-04-28 03:16:08 +05:30
parent 2a0aa86ca9
commit ad4513784c
3 changed files with 746 additions and 0 deletions
@@ -0,0 +1,127 @@
+# Description:
+#   OpenCV xcframework for video/image processing on iOS.
+
+licenses(["notice"])  # BSD license
+
+exports_files(["LICENSE"])
+
+load(
+    "@build_bazel_rules_apple//apple:apple.bzl",
+    "apple_static_xcframework_import",
+)
+
+load(
+    "@//third_party:opencv_ios_source.bzl",
+    "select_headers",
+    "unzip_opencv_xcframework",
+)
+
+# Build opencv2.xcframework from source using a convenience script provided in
+# OPENCV sources and zip the xcframework. We only build the modules required by MediaPipe by specifying
+# the modules to be ignored as command line arguments. 
+# We also specify the simulator and device architectures we are building for.
+# Currently we only support iOS arm64 (M1 Macs) and x86_64(Intel Macs) simulators
+# and arm64 iOS devices.
+# Bitcode and Swift support. Swift support will be added in when the final binary
+# for MediaPipe iOS Task libraries are built. Shipping with OPENCV built with
+# Swift support throws linker errors when the MediaPipe framework is used from
+# an iOS project.
+genrule(
+    name = "build_opencv_xcframework",
+    srcs = glob(["opencv-4.5.1/**"]),
+    outs = ["opencv2.xcframework.zip"],
+    cmd = "&&".join([
+        "$(location opencv-4.5.1/platforms/apple/build_xcframework.py) \
+        --iphonesimulator_archs arm64,x86_64 \
+        --iphoneos_archs arm64 \
+        --without dnn \
+        --without ml \
+        --without stitching \
+        --without photo \
+        --without objdetect \
+        --without gapi \
+        --without flann \
+        --disable PROTOBUF \
+        --disable-bitcode \
+        --disable-swift \
+        --build_only_specified_archs \
+        --out $(@D)",
+        "cd $(@D)",
+        "zip --symlinks -r opencv2.xcframework.zip opencv2.xcframework",
+    ]),
+)
+
+# Unzips `opencv2.xcframework.zip` built from source by `build_opencv_xcframework`
+# genrule and returns an exhaustive list of all its files including symlinks.
+unzip_opencv_xcframework (
+    name = "opencv2_unzipped_xcframework_files",
+    zip_file = "opencv2.xcframework.zip",
+)
+
+# Imports the files of the unzipped `opencv2.xcframework` as an apple static
+# framework which can be linked to iOS targets.
+apple_static_xcframework_import(
+    name = "opencv_xcframework",
+    xcframework_imports = [":opencv2_unzipped_xcframework_files"],
+    visibility = ["//visibility:public"],
+)
+
+# Filters the headers for each platform in `opencv2.xcframework` which will be
+# used as headers in a `cc_library` that can be linked to C++ targets.
+select_headers(
+    name = "opencv_xcframework_device_headers",
+    srcs = [":opencv_xcframework"],
+    platform = "ios-arm64",
+)
+
+select_headers(
+    name = "opencv_xcframework_simulator_headers",
+    srcs = [":opencv_xcframework"],
+    platform = "ios-arm64_x86_64-simulator",
+)
+
+# `cc_library` that can be linked to C++ targets to import opencv headers.
+cc_library(
+    name = "opencv",
+    hdrs = select({
+        "@//mediapipe:ios_x86_64" : [
+            ":opencv_xcframework_simulator_headers"
+        ],
+        "@//mediapipe:ios_sim_arm64" : [
+            ":opencv_xcframework_simulator_headers"
+        ],
+        "@//mediapipe:ios_arm64" : [
+            ":opencv_xcframework_simulator_headers"
+        ],
+        # A value from above is chosen arbitarily.
+        "//conditions:default": [
+            ":opencv_xcframework_simulator_headers"
+        ],
+    }),
+    copts = [
+        "-std=c++11",
+        "-x objective-c++",
+    ],
+    include_prefix = "opencv2",
+    linkopts = [
+        "-framework AssetsLibrary",
+        "-framework CoreFoundation",
+        "-framework CoreGraphics",
+        "-framework CoreMedia",
+        "-framework Accelerate",
+        "-framework CoreImage",
+        "-framework AVFoundation",
+        "-framework CoreVideo",
+        "-framework QuartzCore",
+    ],
+    strip_include_prefix = select({
+        "@//mediapipe:ios_x86_64" : "opencv2.xcframework/ios-arm64_x86_64-simulator/opencv2.framework/Versions/A/Headers",
+        "@//mediapipe:ios_sim_arm64" :"opencv2.xcframework/ios-arm64_x86_64-simulator/opencv2.framework/Versions/A/Headers",
+        "@//mediapipe:ios_arm64" : "opencv2.xcframework/ios-arm64/opencv2.framework/Versions/A/Headers",
+        # Random value is selected for default cases.
+        "//conditions:default": "opencv2.xcframework/ios-arm64_x86_64-simulator/opencv2.framework/Versions/A/Headers",
+    }),
+    visibility = ["//visibility:public"],
+    deps = [":opencv_xcframework"],
+    # data = [":opencv_xcframework"]
+)