PMNG-6541 [platform] Reduce size of opencv by cherrypicking the modul…

…es to include (#5)

Makefile

@@ -7,3 +7,6 @@ build_4_5_2:
 build_4_6_0:
 	Scripts/opencv_xcframework.sh build_4_6_0
 
+build_4_9_0:
+	Scripts/opencv_xcframework.sh build_4_9_0
+

docs/4.9.0/opencv-4.9.0-module_size_analysis.csv

@@ -0,0 +1,23 @@
+Module name,Amount of lines,Percentage of total,Cherrypicked modules,Percentage of total,Why is needed,,"Baseline of which modules to include, obtained from https://github.com/nihui/opencv-mobile/tree/master?tab=readme-ov-file#opencv-modules-included",
+core,221692,21.56589411,221692,37.7601319,Baseline,,Size reduction of cherrypicked VS full (percentage),57.11286753
+dnn,219894,21.39098713,,0,,,,
+imgproc,124210,12.08297867,124210,21.1563159,Baseline,,,
+gapi,104092,10.12592719,,0,,,,
+objdetect,60815,5.915999903,60815,10.35843613,Incode,,,
+features2d,55363,5.38563681,55363,9.429813356,,,,
+calib3d,52794,5.135728009,52794,8.992243309,Revolut,,,
+videoio,42292,4.114107833,,0,,,,
+ts,34142,3.321286996,,0,,,,
+imgcodecs,15750,1.532138427,15750,2.682650152,Baseline,,,
+video,14525,1.412972105,14525,2.473999584,Baseline,,,
+highgui,13629,1.325810453,13629,2.321386598,Baseline,,,
+ml,13311,1.294875848,13311,2.267222614,"Incode, IPCheckCapture",,,
+java,10822,1.052749337,,0,,,,
+python,10343,1.006152873,,0,,,,
+stitching,9364,0.9109170943,,0,,,,
+flann,8158,0.7935990661,8158,1.389527615,calib3d,,,
+js,8099,0.7878596269,,0,,,,
+photo,6859,0.6672341253,6859,1.16827285,Baseline,,,
+objc,1717,0.1670274083,,0,,,,
+world,104,0.01011697755,,0,,,,
+TOTAL,1027975,100,587106,100,,,,

opencv2.json

@@ -1,4 +1,5 @@
 {
     "4.5.2": "https://github.com/revolut-mobile/opencv-binary/releases/download/4.5.2/opencv2.xcframework.zip",
-    "4.6.0": "https://github.com/revolut-mobile/opencv-binary/releases/download/4.6.0/opencv2.xcframework.zip"
+    "4.6.0": "https://github.com/revolut-mobile/opencv-binary/releases/download/4.6.0/opencv2.xcframework.zip",
+    "4.9.0": "https://github.com/revolut-mobile/opencv-binary/releases/download/4.9.0/opencv2.xcframework.zip"
 }

scripts/opencv_xcframework.sh

@@ -22,6 +22,47 @@ build_xcframework() {
         "$@"
 }
 
+build_xcframework_excluding_modules_4_9_0() {
+    readonly VERSION="4.9.0"
+
+    # Baseline of which modules to include, obtained from https://github.com/nihui/opencv-mobile/tree/master?tab=readme-ov-file#opencv-modules-included
+
+    # Remove below big files that Revolut does not use
+    find "${BUILD_DIR}/${VERSION}/modules/imgproc/src" -maxdepth 1 -type f -name 'imgwarp*' -delete # Delete 691KB of the final release binary
+
+    python3 "${BUILD_DIR}/${VERSION}/platforms/apple/build_xcframework.py" \
+        --build_only_specified_archs \
+        --iphoneos_archs arm64 \
+        --iphonesimulator_archs arm64,x86_64 \
+        --out "${OUTPUT_DIR}" \
+        `# --without calib3d # Needed by Revolut code` \
+        `# --without core # based on baseline` \
+        --without dnn \
+        `# --without features2d # based on baseline` \
+        `# --without flann # Needed by calib3d` \
+        --without gapi \
+        `# --without highgui # based on baseline` \
+        `# --without imgcodecs # Needed by Revolut code` \
+        `# --without imgproc # based on baseline` \
+        --without java \
+        --without js \
+        `# --without ml # Needed by Incode and IPCheckCapture2` \
+        --without objc \
+        `# --without objdetect # Needed by Incode` \
+        `# --without photo # based on baseline` \
+        --without python \
+        --without stitching \
+        --without ts \
+        `# --without video # based on baseline` \
+        --without videoio \
+        --without world \
+        "$@"
+
+        # Outcome at the time of testing, for a release-type build:
+        # * Before: opencv size is 13.5MB
+        # * After: opencv size is 4MB
+}
+
 # OpenCV builds frameworks with symlinks inside them: remove them here, for clarity
 patch_xcframework_remove_symlinks() {
     readonly TMP_DIR="${OUTPUT_DIR}/tmp_dir"
@@ -81,5 +122,18 @@ build_4_6_0() {
     patch_xcframework_remove_symlinks
 }
 
+build_4_9_0() {
+    clone 4.9.0
+    disable_ios_visibility_warnings 4.9.0
+
+    # Fix PATH to find python
+    # See: https://github.com/opencv/opencv/issues/21926#issuecomment-1156755364
+    ln -s "$(which python3)" "$(pwd)/${BUILD_DIR}/python"
+    export PATH="$(pwd)/${BUILD_DIR}:${PATH}"
+
+    build_xcframework_excluding_modules_4_9_0
+    patch_xcframework_remove_symlinks
+}
+
 rm -rf "${BUILD_DIR}"
 "$@"