opencv4[contrib] does not pick up hdf5 and tesseract for arm64-windows

[aungthetnaing]

.\vcpkg.exe install opencv4[contrib]
Computing installation plan...
The following packages will be built and installed:

• bzip2[core,tool]:x86-windows -> 1.0.8#3
• curl[core,non-http,schannel,ssl,sspi]:x86-windows -> 7.84.0#2
• giflib[core]:x86-windows -> 5.2.1#3
• hdf5[core,szip,zlib]:x86-windows -> 1.12.2#3
• leptonica[core]:x86-windows -> 1.82.0
• libarchive[bzip2,core,libxml2,lz4,lzma,openssl,zstd]:x86-windows -> 3.6.1#1
• libiconv[core]:x86-windows -> 1.17
• libjpeg-turbo[core]:x86-windows -> 2.1.4
• liblzma[core]:x86-windows -> 5.2.5#6
• libpng[core]:x86-windows -> 1.6.38
• libwebp[core,libwebpmux,nearlossless,simd,unicode]:x86-windows -> 1.2.4
• libxml2[core]:x86-windows -> 2.9.14#1
• lz4[core]:x86-windows -> 1.9.3#4
  opencv4[contrib,core,default-features,dnn,jpeg,png,quirc,tiff,webp]:x86-windows -> 4.6.0#8
• openjpeg[core]:x86-windows -> 2.5.0
• openssl[core]:x86-windows -> 3.0.7#1
• protobuf[core]:x86-windows -> 3.21.8
• quirc[core]:x86-windows -> 1.1#3
• szip[core]:x86-windows -> 2.1.1#9
• tesseract[core]:x86-windows -> 5.2.0#3
• tiff[core,jpeg,lzma,zip]:x86-windows -> 4.4.0#1
• zlib[core]:x86-windows -> 1.2.13
• zstd[core]:x86-windows -> 1.5.2#1

.\vcpkg.exe install opencv4[contrib]:arm64-windows
Computing installation plan...
The following packages will be built and installed:

• libjpeg-turbo[core]:arm64-windows -> 2.1.4
• liblzma[core]:arm64-windows -> 5.2.5#6
• libpng[core]:arm64-windows -> 1.6.38
• libwebp[core,libwebpmux,nearlossless,simd,unicode]:arm64-windows -> 1.2.4
  opencv4[contrib,core,default-features,dnn,jpeg,png,quirc,tiff,webp]:arm64-windows -> 4.6.0#8
• protobuf[core]:arm64-windows -> 3.21.8
• quirc[core]:arm64-windows -> 1.1#3
• tiff[core,jpeg,lzma,zip]:arm64-windows -> 4.4.0#1
• zlib[core]:arm64-windows -> 1.2.13

Eventually, arm64-windows install will fail with failure to locate HDF5 and Tesseract.

[aungthetnaing]

"contrib": {
"description": "opencv_contrib module",
"dependencies": [
{
"name": "hdf5",
"platform": "!uwp & !(windows & (arm | arm64)) & !ios"
},
{
"name": "tesseract",
"platform": "!uwp & !(windows & (arm | arm64)) & !ios"
}
]
},

However, if I'm building natively in ARM64, the install looks for the dependencies. If building cross compilation from x64. install will pass but find_package will evenentually since generated OpenCVModules.cmake still has the followings:
find_dependency(HDF5)
find_dependency(Tesseract)

[dg0yt]

Useful observations.
IMO opencv4 features and dependencies need to be modeled differently, to simplify dependency usage and export. At least for hdf5, the situation is that we can hardly support any cross build (unless we know certain configuration parameters). It would be easy to model this for a feature via supports. (Features can be checked in the port file.) But what I see is dependencies with platform. (Dependencies cannot be checked easily in the port file.)

[aungthetnaing]

For now, workaround is to change in vcpkg.json for opencv4

"contrib": {
"description": "opencv_contrib module",
"dependencies": [
{
"name": "hdf5",
"platform": "!uwp & !ios"
},
{
"name": "tesseract",
"platform": "!uwp & !ios"
}
]
},

In that way, native build will pass without issue.

[aungthetnaing]

HDF5 cross-compile issue is #24898, once that's closed, my proposed fix can be applicable for both cases.

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