feat: 切换后端至PaddleOCR-NCNN，切换工程为CMake

1.项目后端整体迁移至PaddleOCR-NCNN算法，已通过基本的兼容性测试
2.工程改为使用CMake组织，后续为了更好地兼容第三方库，不再提供QMake工程
3.重整权利声明文件，重整代码工程，确保最小化侵权风险

Log: 切换后端至PaddleOCR-NCNN，切换工程为CMake
Change-Id: I4d5d2c5d37505a4a24b389b1a4c5d12f17bfa38c

3rdparty/opencv-4.5.4/modules/highgui/cmake/detect_gtk.cmake

@@ -0,0 +1,45 @@
+# --- GTK ---
+ocv_clear_vars(HAVE_GTK HAVE_GTK2 HAVE_GTK3 HAVE_GTHREAD HAVE_GTKGLEXT)
+if(WITH_GTK)
+  if(NOT WITH_GTK_2_X)
+    ocv_check_modules(GTK3 gtk+-3.0)
+    if(HAVE_GTK3)
+      ocv_add_external_target(gtk3 "${GTK3_INCLUDE_DIRS}" "${GTK3_LIBRARIES}" "HAVE_GTK3;HAVE_GTK")
+      set(HAVE_GTK TRUE)
+    endif()
+  endif()
+  if((PROJECT_NAME STREQUAL "OpenCV" AND HIGHGUI_ENABLE_PLUGINS) OR NOT HAVE_GTK3)
+    ocv_check_modules(GTK2 gtk+-2.0)
+    if(HAVE_GTK2)
+      set(MIN_VER_GTK "2.18.0")
+      if(GTK2_VERSION VERSION_LESS MIN_VER_GTK)
+        message(FATAL_ERROR "GTK support requires a minimum version of ${MIN_VER_GTK} (${GTK2_VERSION} found)")
+      else()
+        ocv_add_external_target(gtk2 "${GTK2_INCLUDE_DIRS}" "${GTK2_LIBRARIES}" "HAVE_GTK2;HAVE_GTK")
+        set(HAVE_GTK TRUE)
+      endif()
+    endif()
+  endif()
+  ocv_check_modules(GTHREAD gthread-2.0)
+  if(HAVE_GTK AND NOT HAVE_GTHREAD)
+    message(FATAL_ERROR "gthread not found. This library is required when building with GTK support")
+  else()
+    ocv_add_external_target(gthread "${GTHREAD_INCLUDE_DIRS}" "${GTHREAD_LIBRARIES}" "HAVE_GTHREAD")
+  endif()
+  if((WITH_OPENGL OR HAVE_OPENGL) AND HAVE_GTK2)
+    ocv_check_modules(GTKGLEXT gtkglext-1.0)
+    if(HAVE_GTKGLEXT)
+      ocv_add_external_target(gtkglext "${GTKGLEXT_INCLUDE_DIRS}" "${GTKGLEXT_LIBRARIES}" "HAVE_GTKGLEXT")
+    endif()
+  endif()
+elseif(HAVE_GTK)
+  ocv_add_external_target(gtk "${GTK_INCLUDE_DIRS}" "${GTK_LIBRARIES}" "${GTK_DEFINES};HAVE_GTK")
+endif()
+
+if(WITH_OPENGL AND HAVE_GTKGLEXT)
+  find_package(OpenGL QUIET)
+  if(OPENGL_FOUND)
+    set(HAVE_OPENGL TRUE)
+    ocv_add_external_target(gtk_opengl "${OPENGL_INCLUDE_DIRS}" "${OPENGL_LIBRARIES}" "HAVE_OPENGL")
+  endif()
+endif()

3rdparty/opencv-4.5.4/modules/highgui/cmake/detect_win32ui.cmake

@@ -0,0 +1,15 @@
+#--- Win32 UI ---
+ocv_clear_vars(HAVE_WIN32UI)
+if(WITH_WIN32UI)
+  try_compile(HAVE_WIN32UI
+    "${CMAKE_CURRENT_BINARY_DIR}"
+    "${OpenCV_SOURCE_DIR}/cmake/checks/win32uitest.cpp"
+    CMAKE_FLAGS "-DLINK_LIBRARIES:STRING=user32;gdi32")
+  if(HAVE_WIN32UI)
+    set(__libs "user32" "gdi32")
+    if(OpenCV_ARCH STREQUAL "ARM64")
+      list(APPEND __libs "comdlg32" "advapi32")
+    endif()
+    ocv_add_external_target(win32ui "" "${__libs}" "HAVE_WIN32UI")
+  endif()
+endif()

3rdparty/opencv-4.5.4/modules/highgui/cmake/init.cmake

@@ -0,0 +1,44 @@
+if(PROJECT_NAME STREQUAL "OpenCV")
+  set(ENABLE_PLUGINS_DEFAULT ON)
+  if(EMSCRIPTEN OR IOS OR WINRT)
+    set(ENABLE_PLUGINS_DEFAULT OFF)
+  endif()
+  set(HIGHGUI_PLUGIN_LIST "" CACHE STRING "List of GUI backends to be compiled as plugins (gtk, gtk2/gtk3, qt, win32 or special value 'all')")
+  set(HIGHGUI_ENABLE_PLUGINS "${ENABLE_PLUGINS_DEFAULT}" CACHE BOOL "Allow building and using of GUI plugins")
+  mark_as_advanced(HIGHGUI_PLUGIN_LIST HIGHGUI_ENABLE_PLUGINS)
+
+  string(REPLACE "," ";" HIGHGUI_PLUGIN_LIST "${HIGHGUI_PLUGIN_LIST}")  # support comma-separated list (,) too
+  if(NOT HIGHGUI_ENABLE_PLUGINS)
+    if(HIGHGUI_PLUGIN_LIST)
+      message(WARNING "HighGUI: plugins are disabled through HIGHGUI_ENABLE_PLUGINS, so HIGHGUI_PLUGIN_LIST='${HIGHGUI_PLUGIN_LIST}' is ignored")
+      set(HIGHGUI_PLUGIN_LIST "")
+    endif()
+  else()
+    # Make virtual plugins target
+    if(NOT TARGET opencv_highgui_plugins)
+      add_custom_target(opencv_highgui_plugins ALL)
+    endif()
+  endif()
+endif()
+
+#
+# Detect available dependencies
+#
+
+if(NOT PROJECT_NAME STREQUAL "OpenCV")
+  include(FindPkgConfig)
+endif()
+
+macro(add_backend backend_id cond_var)
+  if(${cond_var})
+    include("${CMAKE_CURRENT_LIST_DIR}/detect_${backend_id}.cmake")
+  endif()
+endmacro()
+
+add_backend("gtk" WITH_GTK)
+add_backend("win32ui" WITH_WIN32UI)
+# TODO cocoa
+# TODO qt
+# TODO opengl
+
+# FIXIT: move content of cmake/OpenCVFindLibsGUI.cmake here (need to resolve CMake scope issues)

3rdparty/opencv-4.5.4/modules/highgui/cmake/plugin.cmake

@@ -0,0 +1,61 @@
+function(ocv_create_builtin_highgui_plugin name target)
+
+  ocv_debug_message("ocv_create_builtin_highgui_plugin(${ARGV})")
+
+  if(NOT TARGET ${target})
+    message(FATAL_ERROR "${target} does not exist!")
+  endif()
+  if(NOT OpenCV_SOURCE_DIR)
+    message(FATAL_ERROR "OpenCV_SOURCE_DIR must be set to build the plugin!")
+  endif()
+
+  message(STATUS "HighGUI: add builtin plugin '${name}'")
+
+  foreach(src ${ARGN})
+    list(APPEND sources "${CMAKE_CURRENT_LIST_DIR}/src/${src}")
+  endforeach()
+
+  add_library(${name} MODULE ${sources})
+  target_include_directories(${name} PRIVATE "${CMAKE_CURRENT_BINARY_DIR}")
+  target_compile_definitions(${name} PRIVATE BUILD_PLUGIN)
+  target_link_libraries(${name} PRIVATE ${target})
+
+  foreach(mod opencv_highgui
+      opencv_core
+      opencv_imgproc
+      opencv_imgcodecs
+      opencv_videoio  # TODO remove this dependency
+  )
+    ocv_target_link_libraries(${name} LINK_PRIVATE ${mod})
+    ocv_target_include_directories(${name} "${OPENCV_MODULE_${mod}_LOCATION}/include")
+  endforeach()
+
+  if(WIN32)
+    set(OPENCV_PLUGIN_VERSION "${OPENCV_DLLVERSION}" CACHE STRING "")
+    if(CMAKE_CXX_SIZEOF_DATA_PTR EQUAL 8)
+      set(OPENCV_PLUGIN_ARCH "_64" CACHE STRING "")
+    else()
+      set(OPENCV_PLUGIN_ARCH "" CACHE STRING "")
+    endif()
+  else()
+    set(OPENCV_PLUGIN_VERSION "" CACHE STRING "")
+    set(OPENCV_PLUGIN_ARCH "" CACHE STRING "")
+  endif()
+
+  set_target_properties(${name} PROPERTIES
+    CXX_STANDARD 11
+    CXX_VISIBILITY_PRESET hidden
+    DEBUG_POSTFIX "${OPENCV_DEBUG_POSTFIX}"
+    OUTPUT_NAME "${name}${OPENCV_PLUGIN_VERSION}${OPENCV_PLUGIN_ARCH}"
+  )
+
+  if(WIN32)
+    set_target_properties(${name} PROPERTIES LIBRARY_OUTPUT_DIRECTORY ${EXECUTABLE_OUTPUT_PATH})
+    install(TARGETS ${name} OPTIONAL LIBRARY DESTINATION ${OPENCV_BIN_INSTALL_PATH} COMPONENT plugins)
+  else()
+    install(TARGETS ${name} OPTIONAL LIBRARY DESTINATION ${OPENCV_LIB_INSTALL_PATH} COMPONENT plugins)
+  endif()
+
+  add_dependencies(opencv_highgui_plugins ${name})
+
+endfunction()