Merge pull request #16724 from liqi-c:3.4-tengine

* Add Tengine support .

* Modify printf to CV_LOG_WARNING

* a few minor fixes in the code

* Renew Tengine version

* Add header file for CV_LOG_WARNING

* Add #ifdef HAVE_TENGINE in tengine_graph_convolution.cpp

* remove trailing whitespace

* Remove trailing whitespace

* Modify for compile problem

* Modify some code style error

* remove whitespace

* Move some code style problem

* test

* add ios limit and build problem

* Modified as alalek suggested

* Add cmake 2.8 support

* modify cmake 3.5.1 problem

* test and set BUILD_ANDROID_PROJECTS OFF

* remove some compile error

* remove some extra code in tengine

* close test.

* Test again

* disable android.

* delete ndk version judgement

* Remove setenv() call . and add License information

* Set tengine default OFF. Close test .

Co-authored-by: Vadim Pisarevsky <vadim.pisarevsky@gmail.com>

CMakeLists.txt

@@ -432,6 +432,9 @@ OCV_OPTION(WITH_IMGCODEC_PXM "Include PNM (PBM,PGM,PPM) and PAM formats support"
 OCV_OPTION(WITH_QUIRC "Include library QR-code decoding" ON
   VISIBLE_IF TRUE
   VERIFY HAVE_QUIRC)
+OCV_OPTION(WITH_TENGINE "Include Arm Inference Tengine support" OFF
+  VISIBLE_IF (ARM OR AARCH64) AND UNIX AND NOT ANDROID AND NOT IOS
+  VERIFY HAVE_TENGINE)
 
 # OpenCV build components
 # ===================================================
@@ -687,6 +690,9 @@ include(cmake/OpenCVFindLibsVideo.cmake)
 include(cmake/OpenCVFindLibsPerf.cmake)
 include(cmake/OpenCVFindLAPACK.cmake)
 include(cmake/OpenCVFindProtobuf.cmake)
+if(WITH_TENGINE)
+  include(cmake/OpenCVFindTengine.cmake)
+endif()
 
 # ----------------------------------------------------------------------------
 #  Detect other 3rd-party libraries/tools
@@ -1472,6 +1478,10 @@ if(WITH_VA_INTEL OR HAVE_VA_INTEL)
   status("    Intel VA-API/OpenCL:"  HAVE_VA_INTEL       THEN "YES (OpenCL: ${VA_INTEL_IOCL_ROOT})" ELSE NO)
 endif()
 
+if(WITH_TENGINE OR HAVE_TENGINE)
+  status("    Tengine:"      HAVE_TENGINE     THEN "YES (${TENGINE_LIBRARIES})" ELSE NO)
+endif()
+
 if(WITH_LAPACK OR HAVE_LAPACK)
   status("    Lapack:"      HAVE_LAPACK     THEN "YES (${LAPACK_LIBRARIES})" ELSE NO)
 endif()