[opencv4] gen flatbuffers headers (#33191)

* [opencv4] gen flatbuffers headers

* bump ver

* v db

ports/opencv4/0017-fix-flatbuffers.patch

@@ -0,0 +1,20 @@
+diff --git a/cmake/OpenCVDetectFlatbuffers.cmake b/cmake/OpenCVDetectFlatbuffers.cmake
+index 537b738..6dba0fb 100644
+--- a/cmake/OpenCVDetectFlatbuffers.cmake
++++ b/cmake/OpenCVDetectFlatbuffers.cmake
+@@ -1,9 +1,11 @@
+ if(WITH_FLATBUFFERS)
+   set(HAVE_FLATBUFFERS 1)
+-  set(flatbuffers_VERSION "23.5.9")
+-  ocv_install_3rdparty_licenses(flatbuffers "${OpenCV_SOURCE_DIR}/3rdparty/flatbuffers/LICENSE.txt")
+-  ocv_add_external_target(flatbuffers "${OpenCV_SOURCE_DIR}/3rdparty/flatbuffers/include" "" "HAVE_FLATBUFFERS=1")
+-  set(CUSTOM_STATUS_flatbuffers "    Flatbuffers:" "builtin/3rdparty (${flatbuffers_VERSION})")
++  set(flatbuffers_VERSION "23.5.26")
++  #ocv_install_3rdparty_licenses(flatbuffers "${OpenCV_SOURCE_DIR}/3rdparty/flatbuffers/LICENSE.txt")
++  find_path(FLATBUFFERS_INCLUDE_DIR flatbuffers.h PATH_SUFFIXES flatbuffers)
++  get_filename_component(FLATBUFFERS_INCLUDE_DIR "${FLATBUFFERS_INCLUDE_DIR}" PATH)
++  ocv_add_external_target(flatbuffers "${FLATBUFFERS_INCLUDE_DIR}" "" "HAVE_FLATBUFFERS=1")
++  #set(CUSTOM_STATUS_flatbuffers "    Flatbuffers:" "builtin/3rdparty (${flatbuffers_VERSION})")
+ endif()
+ 
+ if(WITH_FLATBUFFERS OR HAVE_FLATBUFFERS)

ports/opencv4/portfile.cmake

@@ -26,10 +26,12 @@ vcpkg_from_github(
       0011-remove-python2.patch
       0012-fix-zlib.patch
       0015-fix-freetype.patch
+      0017-fix-flatbuffers.patch
       "${ARM64_WINDOWS_FIX}"
 )
 # Disallow accidental build of vendored copies
 file(REMOVE_RECURSE "${SOURCE_PATH}/3rdparty/openexr")
+file(REMOVE_RECURSE "${SOURCE_PATH}/3rdparty/flatbuffers")
 
 if(VCPKG_TARGET_ARCHITECTURE STREQUAL "arm64")
   set(TARGET_IS_AARCH64 1)
@@ -86,6 +88,12 @@ if("dnn" IN_LIST FEATURES)
   else()
     message(WARNING "The dnn module cannot be enabled on Android")
   endif()
+  set(FLATC "${CURRENT_HOST_INSTALLED_DIR}/tools/flatbuffers/flatc${VCPKG_HOST_EXECUTABLE_SUFFIX}")
+  vcpkg_execute_required_process(
+    COMMAND "${FLATC}" --cpp -o "${SOURCE_PATH}/modules/dnn/misc/tflite" "${SOURCE_PATH}/modules/dnn/src/tflite/schema.fbs"
+    WORKING_DIRECTORY "${SOURCE_PATH}/modules/dnn/misc/tflite"
+    LOGNAME flatc-${TARGET_TRIPLET}
+  )
 endif()
 
 set(WITH_QT OFF)

ports/opencv4/vcpkg.json

@@ -1,6 +1,7 @@
 {
   "name": "opencv4",
   "version": "4.8.0",
+  "port-version": 1,
   "description": "computer vision library",
   "homepage": "https://github.com/opencv/opencv",
   "license": "Apache-2.0",
@@ -102,6 +103,12 @@
     "dnn": {
       "description": "Enable dnn module",
       "dependencies": [
+        "flatbuffers",
+        {
+          "name": "flatbuffers",
+          "host": true,
+          "default-features": false
+        },
         "protobuf"
       ]
     },

versions/baseline.json

@@ -6014,7 +6014,7 @@
     },
     "opencv4": {
       "baseline": "4.8.0",
-      "port-version": 0
+      "port-version": 1
     },
     "opendnp3": {
       "baseline": "3.1.1",

versions/o-/opencv4.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "78f4556a682ebb41e2ff3f26090ef51cafe5a66c",
+      "version": "4.8.0",
+      "port-version": 1
+    },
     {
       "git-tree": "0bae188d52a71f441df28b25278e5506502dfd03",
       "version": "4.8.0",