[opencv] opencv_contrib won't compile Freetype module

[unbored]

I've installed the two packages freetype and harfbuzz which Freetype module needs.

CMakeLists.txt in Freetype module wrotes:

if(PKG_CONFIG_FOUND)
  pkg_search_module(FREETYPE freetype2)
  pkg_search_module(HARFBUZZ harfbuzz)
endif()

It won't find freetype and harfbuzz since pkg_config doesn't exist in Windows. If I change the code to what vcpkg indicated:

find_package(Freetype REQUIRED)
find_package(harfbuzz CONFIG REQUIRED)

it does find freetype, but harfbuzz is still missing.

[Cheney-W]

I have tested this issue with vcpkg 2018.11.23-nohash and VS2017 15.9.9, I could find these two ports with following sentences in cmake project:
find_package(Freetype REQUIRED)
find_package(harfbuzz CONFIG REQUIRED)
I think this issue should be fixed, so close this issue.
If you could reproduce this issue in your side, please contact me again and provide a detailed repro steps.

[unbored]

I have tested this issue with vcpkg 2018.11.23-nohash and VS2017 15.9.9, I could find these two ports with following sentences in cmake project:
find_package(Freetype REQUIRED)
find_package(harfbuzz CONFIG REQUIRED)
I think this issue should be fixed, so close this issue.
If you could reproduce this issue in your side, please contact me again and provide a detailed repro steps.

@Cheney-W I don't mean that the cmake project can't find the two ports, I mean that OpenCV can't recognize the harfbuzz found.

[gansm255]

Hi,
Freetype and hdf libraries are not built in my configuration. I use opencv 3.4.1 and opencv_contrib 3.4.1. Please guide me how to enable these two modules. which files i have to change. Thanks and regards, Murugan

[gansm255]

i develop in cygwin for cross development to target aarch64-unknown-linux-gnu.

[Cheney-W]

@unbored About harfbuzz can't find in OpenCV, please use harfbuzz_FOUND instead of HARFBUZZ_FOUND in the CMakeLists.txt of freetype.

@gansm255 Since the version of opencv3 currently provided by vcpkg is 3.4.7, are you using vcpkg to install opencv?

[gansm255]

Hi,
Thanks for immediate help.

1. I am not using vcpkg. I download source 4.2.0 and build under cygwin and cross compile with compiler aarch64-unknown-linux-gnu-g++.
2. also i need to enable freetype.
3. in your yesterday comment, you have mentioned to use harfbuzz_FOUND instead of HARBUZZ_FOUND in the CMakeList.txt file under freetype folder. This change does not make any difference.
4. the issue is freetype and harfbuzz modules are not found ocv_check_modules .

[Cheney-W]

@gansm255 I think you could submit an issue on https://github.com/opencv/opencv_contrib/issues .

[ivanshilo]

I have spent quite a lot of time to find this:
in ports\opencv4\portfile.cmake it will activate freetype module only if ask for opencv4[ovis] feature.
if(BUILD_opencv_ovis) string(APPEND DEPS_STRING "\nfind_dependency(Ogre)\nfind_dependency(Freetype)") endif()

This is unfortunate because [ovis] brings a lot of other libraries as dependecies which I absolutely do not need.

UPDATE
After a bit more research it turns out that ovis feature is not enough/not necessary to activate freetype.
It does not work because of incorrect package search command.
It is not directly related to vcpkg, similar issue is opened at [opencv_contrib] github itself.
opencv/opencv_contrib#1497

Seems that nobody there cares that under windows freetype is not available.
Unofficial "patches" were issued, read
https://gist.github.com/UnaNancyOwen/14c72a3f10a46d41c359ab6ea307a1d2#file-readme-md

So far exisiting workarounds are not good enough for vcpkg.
Vcpkg will overwrite any manual changes to cmake files when user starts build/upgrade.
Therefore the only way is to create a patch for cmake file and register patch in ports\opencv4\portfile.cmake file. Then if it works, to create a pull request.

[JonLiu1993]

@unbored , Thanks for posting this issue, Can you try this workaround?

the issue is in:

opencv_contrib/modules/freetype/CMakeLists.txt

set(the_description "FreeType module. It enables to draw strings with outlines and mono-bitmaps/gray-bitmaps.")

find_package(Freetype REQUIRED)

# find_package(HarfBuzz) is not included in cmake
set(HARFBUZZ_DIR "$ENV{HARFBUZZ_DIR}" CACHE PATH "HarfBuzz directory")
find_path(HARFBUZZ_INCLUDE_DIRS
    NAMES hb-ft.h PATH_SUFFIXES harfbuzz
    HINTS ${HARFBUZZ_DIR}/include)
find_library(HARFBUZZ_LIBRARIES
    NAMES harfbuzz
    HINTS ${HARFBUZZ_DIR}/lib)
find_package_handle_standard_args(HARFBUZZ
    DEFAULT_MSG HARFBUZZ_LIBRARIES HARFBUZZ_INCLUDE_DIRS)

if(NOT FREETYPE_FOUND)
  message(STATUS "freetype2:   NO")
else()
  message(STATUS "freetype2:   YES")
endif()

if(NOT HARFBUZZ_FOUND)
  message(STATUS "harfbuzz:   NO")
else()
  message(STATUS "harfbuzz:   YES")
endif()

if(FREETYPE_FOUND AND HARFBUZZ_FOUND)
  ocv_define_module(freetype opencv_core opencv_imgproc PRIVATE_REQUIRED ${FREETYPE_LIBRARIES} ${HARFBUZZ_LIBRARIES} WRAP python)
  ocv_include_directories(${FREETYPE_INCLUDE_DIRS} ${HARFBUZZ_INCLUDE_DIRS})
else()
  ocv_module_disable(freetype)
endif()

[netcorefan1]

Someone could tell me what is the right patch for Windows? I opened an issue and I've been told that I need to do some modifications. This issue seems to reappear over the years and very difficult to fix from vcpkg side in a reliable way, therefore I'm afraid I'm better off to patch opencv_contrib/modules/freetype/CMakeLists.txt.

In the workaround link posted from @JonLiu1993 there are two versions. The main one (the one just above the pic) does not work. When applied I get plenty of warnings and versions are not detected (seems there is also some duplicated stuff to mess up things):

-- Found Freetype: optimized;C:/dev/vcpkg/installed/x64-windows/lib/freetype.lib;debug;C:/dev/vcpkg/installed/x64-windows/debug/lib/freetyped.lib (found version "2.12.1")
-- Found HARFBUZZ: C:/dev/vcpkg/installed/x64-windows/lib/harfbuzz.lib
-- freetype2:   YES
-- harfbuzz:   YES
-- Julia not found. Not compiling Julia Bindings.
-- Module opencv_ovis disabled because OGRE3D was not found
-- No preference for use of exported gflags CMake configuration set, and no hints for include/library directories provided. Defaulting to preferring an installed/exported gflags CMake configuration if available.
-- Failed to find installed gflags CMake configuration, searching for gflags build directories exported with CMake.
-- Failed to find gflags - Failed to find an installed/exported CMake configuration for gflags, will perform search for installed gflags components.
-- Failed to find gflags - Could not find gflags include directory, set GFLAGS_INCLUDE_DIR to directory containing gflags/gflags.h
-- Failed to find glog - Could not find glog include directory, set GLOG_INCLUDE_DIR to directory containing glog/logging.h
-- Module opencv_sfm disabled because the following dependencies are not found: Eigen Glog/Gflags
-- Tesseract:   YES (ver 5.3.0)
-- Module opencv_python3 disabled because opencv_python_bindings_generator dependency can't be resolved!
-- Assume that non-module dependency is available: optimized (for module opencv_freetype)
-- Assume that non-module dependency is available: debug (for module opencv_freetype)
-- Assume that non-module dependency is available: optimized (for module opencv_freetype)
-- Assume that non-module dependency is available: debug (for module opencv_freetype)
-- Allocator metrics storage type: 'long long'
-- Excluding from source files list: modules/imgproc/src/imgwarp.lasx.cpp
-- Excluding from source files list: modules/imgproc/src/resize.lasx.cpp
-- Registering hook 'INIT_MODULE_SOURCES_opencv_dnn': C:/dev/OpenCv/opencv/modules/dnn/cmake/hooks/INIT_MODULE_SOURCES_opencv_dnn.cmake
-- opencv_dnn: filter out cuda4dnn source code
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.rvv.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/layers/layers_common.lasx.cpp
-- Excluding from source files list: <BUILD>/modules/dnn/int8layers/layers_common.lasx.cpp
-- freetype2:   YES
-- harfbuzz:   YES
CMake Warning at cmake/OpenCVUtils.cmake:1699 (message):
  Unexpected CMake generator expression:
  $<$<NOT:$<CONFIG:DEBUG>>:C:/dev/vcpkg/installed/x64-windows/lib/freetype.lib>
Call Stack (most recent call first):
  CMakeLists.txt:1186 (ocv_get_all_libs)


CMake Warning at cmake/OpenCVUtils.cmake:1699 (message):
  Unexpected CMake generator expression:
  $<$<CONFIG:DEBUG>:C:/dev/vcpkg/installed/x64-windows/debug/lib/freetyped.lib>
Call Stack (most recent call first):
  CMakeLists.txt:1186 (ocv_get_all_libs)


CMake Warning at cmake/OpenCVUtils.cmake:1699 (message):
  Unexpected CMake generator expression:
  $<$<NOT:$<CONFIG:DEBUG>>:C:/dev/vcpkg/installed/x64-windows/lib/freetype.lib>
Call Stack (most recent call first):
  CMakeLists.txt:1186 (ocv_get_all_libs)


CMake Warning at cmake/OpenCVUtils.cmake:1699 (message):
  Unexpected CMake generator expression:
  $<$<CONFIG:DEBUG>:C:/dev/vcpkg/installed/x64-windows/debug/lib/freetyped.lib>
Call Stack (most recent call first):
  CMakeLists.txt:1186 (ocv_get_all_libs)

Below there is another one, but seems for Linux and although I don't get warnings when applied, harfbuzz is not even showed:

-- Module opencv_alphamat disabled because the following dependencies are not found: Eigen
-- Found Freetype: optimized;C:/dev/vcpkg/installed/x64-windows/lib/freetype.lib;debug;C:/dev/vcpkg/installed/x64-windows/debug/lib/freetyped.lib (found version "2.12.1")
-- Found HARFBUZZ: C:/dev/vcpkg/installed/x64-windows/lib/harfbuzz.lib
-- freetype2:   YES
-- Julia not found. Not compiling Julia Bindings.

The posted fixes are 7 years old. I would appreciate if someone could post a patch that remains reliable over the time with each new release.
I also tried the recent one posted here, but results are not encouraging:

-- Found ZLIB: zlib (found version "1.2.13")
-- freetype2:   YES (ver )
-- harfbuzz:    YES (ver )
-- Julia not found. Not compiling Julia Bindings.

[JonLiu1993]

Fixed by PR #27343.