Update OpenCV to 4.13.0 with Lightricks customizations

Add opencv_contrib pinned to the 4.13.0 tag and keep the Lightricks
CV_16F mixChannels fix, mapping half-float channel copies to the 16-bit
copy implementation without adding a ninth CV_DEPTH_MAX table entry.

Build the iOS xcframework for the targets we actually ship: iOS 17+
arm64 device and arm64 simulator. The workflow uses macos-latest-xlarge,
splits device and simulator builds into parallel matrix jobs, and keeps
--build_only_specified_archs so OpenCV does not fall back to deprecated
default architectures.

Disable stitching from the iOS build invocation instead of changing the
root OpenCV module defaults. Leave the upstream IPP default untouched
because IPP does not apply to arm64 iOS builds.

Author: Jenkins CI

.github/workflows/LT_CI.yml

@@ -0,0 +1,61 @@
+name: Build OpenCV iOS xcframework
+on: [push, pull_request]
+
+jobs:
+  build-ios-framework:
+    runs-on: macos-latest-xlarge
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - platform: iphoneos
+            archs: arm64
+            output: iphoneos
+            arch_flag: --iphoneos_archs
+          - platform: iphonesimulator
+            archs: arm64
+            output: iphonesimulator
+            arch_flag: --iphonesimulator_archs
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        submodules: recursive
+
+    - name: Build Release
+      env:
+        IPHONEOS_DEPLOYMENT_TARGET: "17.0"
+      run: |-
+        mkdir -p out/${{ matrix.output }}
+        python3 platforms/ios/build_framework.py --iphoneos_deployment_target $IPHONEOS_DEPLOYMENT_TARGET --contrib opencv_contrib --build_only_specified_archs ${{ matrix.arch_flag }} ${{ matrix.archs }} --without stitching out/${{ matrix.output }}
+        zip --symlinks -r opencv_ios_${{ matrix.output }}.zip out/${{ matrix.output }}/opencv2.framework
+        zip --symlinks -r opencv_ios_${{ matrix.output }}_build_data.zip out/${{ matrix.output }}/build
+    - uses: actions/upload-artifact@v4
+      with:
+        name: ios_${{ matrix.output }}_framework
+        path: opencv_ios_${{ matrix.output }}.zip
+    - uses: actions/upload-artifact@v4
+      with:
+        name: ios_${{ matrix.output }}_build_data
+        path: opencv_ios_${{ matrix.output }}_build_data.zip
+
+  package-ios:
+    runs-on: macos-latest-xlarge
+    needs: build-ios-framework
+    steps:
+    - uses: actions/download-artifact@v4
+      with:
+        name: ios_iphoneos_framework
+    - uses: actions/download-artifact@v4
+      with:
+        name: ios_iphonesimulator_framework
+    - name: Create xcframework
+      run: |-
+        unzip opencv_ios_iphoneos.zip
+        unzip opencv_ios_iphonesimulator.zip
+        mkdir -p out/xcframework
+        xcodebuild -create-xcframework -framework out/iphoneos/opencv2.framework -framework out/iphonesimulator/opencv2.framework -output out/xcframework/opencv2.xcframework
+        zip --symlinks -r opencv_ios_xcframework.zip out/xcframework/opencv2.xcframework
+    - uses: actions/upload-artifact@v4
+      with:
+        name: ios_lib
+        path: opencv_ios_xcframework.zip

.gitignore

@@ -1,6 +1,7 @@
 # ignore dot files/directories
 .*
 !.gitignore
+!.github
 
 *.autosave
 *.pyc

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "opencv_contrib"]
+	path = opencv_contrib
+	url = https://github.com/opencv/opencv_contrib.git

CMakeLists.txt

@@ -281,7 +281,7 @@ OCV_OPTION(WITH_FRAMEBUFFER_XVFB "Include virtual framebuffer support" OFF
 OCV_OPTION(WITH_WAYLAND "Include Wayland support" OFF
         VISIBLE_IF UNIX AND NOT APPLE AND NOT ANDROID
         VERIFY HAVE_WAYLAND)
-OCV_OPTION(WITH_IPP "Include Intel IPP support" (NOT MINGW AND NOT CV_DISABLE_OPTIMIZATION)
+OCV_OPTION(WITH_IPP "Include Intel IPP support" (X86_64 OR X86) AND NOT IOS AND NOT XROS
   VISIBLE_IF (X86_64 OR X86) AND NOT WINRT AND NOT IOS AND NOT XROS
   VERIFY HAVE_IPP)
 OCV_OPTION(WITH_HALIDE "Include Halide support" OFF
@@ -557,6 +557,8 @@ if(ENABLE_IMPL_COLLECTION)
   add_definitions(-DCV_COLLECT_IMPL_DATA)
 endif()
 
+# OpenCV modules to skip
+# ===================================================
 if(OPENCV_DISABLE_FILESYSTEM_SUPPORT)
   add_definitions(-DOPENCV_HAVE_FILESYSTEM_SUPPORT=0)
 endif()

modules/core/src/channels.cpp

@@ -83,7 +83,7 @@ static MixChannelsFunc getMixchFunc(int depth)
     {
         mixChannels8u, mixChannels8u, mixChannels16u,
         mixChannels16u, mixChannels32s, mixChannels32s,
-        mixChannels64s, 0
+        mixChannels64s, mixChannels16u
     };
 
     return mixchTab[depth];