Remove unsupported OpenCL code and related API functions (#4220)

Signed-off-by: Stefan Weil <sw@weilnetz.de>

.gitignore

@@ -83,10 +83,6 @@ __pycache__
 *.traineddata
 tessdata_*
 
-# OpenCL
-tesseract_opencl_profile_devices.dat
-kernel*.bin
-
 # build dirs
 /build*
 /*.dll

CMakeLists.txt

@@ -88,7 +88,6 @@ option(GRAPHICS_DISABLED "Disable disable graphics (ScrollView)" OFF)
 option(DISABLED_LEGACY_ENGINE "Disable the legacy OCR engine" OFF)
 option(ENABLE_LTO "Enable link-time optimization" OFF)
 option(FAST_FLOAT "Enable float for LSTM" ON)
-option(ENABLE_OPENCL "Enable unsupported experimental OpenCL support" OFF)
 option(ENABLE_NATIVE
        "Enable optimization for host CPU (could break HW compatibility)" OFF)
 # see
@@ -460,18 +459,6 @@ else()
   endif(DISABLE_CURL)
 endif()
 
-if(ENABLE_OPENCL)
-  find_package(OpenCL)
-  if(OpenCL_FOUND)
-    include_directories(${OpenCL_INCLUDE_DIRS})
-    message(STATUS "OpenCL_INCLUDE_DIRS: ${OpenCL_INCLUDE_DIRS}")
-    message(STATUS "OpenCL_LIBRARY: ${OpenCL_LIBRARY}")
-    set(USE_OPENCL ON)
-  else()
-    set(USE_OPENCL OFF)
-  endif(OpenCL_FOUND)
-endif(ENABLE_OPENCL)
-
 # ##############################################################################
 #
 # configure
@@ -565,11 +552,6 @@ message(STATUS "Disable the legacy OCR engine [DISABLED_LEGACY_ENGINE]: "
 message(STATUS "Build training tools [BUILD_TRAINING_TOOLS]: "
                "${BUILD_TRAINING_TOOLS}")
 message(STATUS "Build tests [BUILD_TESTS]: ${BUILD_TESTS}")
-if(ENABLE_OPENCL)
-  message(
-    STATUS
-      "Enable unsupported experimental OpenCL [ENABLE_OPENCL]: ${USE_OPENCL}")
-endif(ENABLE_OPENCL)
 message(STATUS "Use system ICU Library [USE_SYSTEM_ICU]: ${USE_SYSTEM_ICU}")
 message(
   STATUS "Install tesseract configs [INSTALL_CONFIGS]: ${INSTALL_CONFIGS}")
@@ -608,7 +590,6 @@ file(
   src/cutil/*.cpp
   src/dict/*.cpp
   src/lstm/*.cpp
-  src/opencl/*.cpp
   src/textord/*.cpp
   src/viewer/*.cpp
   src/wordrec/*.cpp)
@@ -749,7 +730,6 @@ file(
   src/cutil/*.h
   src/dict/*.h
   src/lstm/*.h
-  src/opencl/*.h
   src/textord/*.h
   src/viewer/*.h
   src/wordrec/*.h)
@@ -816,7 +796,6 @@ target_include_directories(
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/cutil>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/dict>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/lstm>
-         $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/opencl>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/textord>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/viewer>
          $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/src/wordrec>
@@ -832,9 +811,6 @@ target_link_libraries(libtesseract PRIVATE ${LIB_Ws2_32} ${LIB_pthread})
 if(OpenMP_CXX_FOUND)
   target_link_libraries(libtesseract PUBLIC OpenMP::OpenMP_CXX)
 endif()
-if(OpenCL_FOUND)
-  target_link_libraries(libtesseract PUBLIC OpenCL::OpenCL)
-endif()
 if(LibArchive_FOUND)
   target_link_libraries(libtesseract PUBLIC ${LibArchive_LIBRARIES})
 endif(LibArchive_FOUND)

Makefile.am

@@ -78,7 +78,6 @@ if VISIBILITY
 AM_CPPFLAGS += -DTESS_EXPORTS
 AM_CPPFLAGS += -fvisibility=hidden -fvisibility-inlines-hidden -fPIC
 endif
-AM_CPPFLAGS += $(OPENCL_CPPFLAGS)
 
 AM_CXXFLAGS = $(OPENMP_CXXFLAGS)
 
@@ -94,17 +93,14 @@ libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/classify
 libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/cutil
 libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/dict
 libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/lstm
-if OPENCL
-libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/opencl
-endif
 libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/textord
 libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/training/common
 libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/viewer
 libtesseract_la_CPPFLAGS += -I$(top_srcdir)/src/wordrec
 libtesseract_la_CPPFLAGS += $(libcurl_CFLAGS)
 
 lib_LTLIBRARIES = libtesseract.la
-libtesseract_la_LDFLAGS = $(LEPTONICA_LIBS) $(OPENCL_LDFLAGS)
+libtesseract_la_LDFLAGS = $(LEPTONICA_LIBS)
 libtesseract_la_LDFLAGS += $(libarchive_LIBS)
 libtesseract_la_LDFLAGS += $(libcurl_LIBS)
 libtesseract_la_LDFLAGS += $(TENSORFLOW_LIBS)
@@ -127,9 +123,6 @@ libtesseract_la_SOURCES += src/api/wordstrboxrenderer.cpp
 libtesseract_la_LIBADD = libtesseract_ccutil.la
 libtesseract_la_LIBADD += libtesseract_lstm.la
 libtesseract_la_LIBADD += libtesseract_native.la
-if OPENCL
-libtesseract_la_LIBADD += libtesseract_opencl.la
-endif
 
 # Rules for src/arch.
 
@@ -561,23 +554,6 @@ if TENSORFLOW
 libtesseract_lstm_la_SOURCES += src/lstm/tfnetwork.pb.cc
 endif
 
-# Rules for src/opencl.
-
-if OPENCL
-libtesseract_opencl_la_CPPFLAGS = $(AM_CPPFLAGS)
-libtesseract_opencl_la_CPPFLAGS += $(OPENCL_CFLAGS)
-libtesseract_opencl_la_CPPFLAGS += -I$(top_srcdir)/src/ccutil
-libtesseract_opencl_la_CPPFLAGS += -I$(top_srcdir)/src/ccstruct
-libtesseract_opencl_la_CPPFLAGS += -I$(top_srcdir)/src/ccmain
-
-noinst_HEADERS += src/opencl/openclwrapper.h
-noinst_HEADERS += src/opencl/oclkernels.h
-
-noinst_LTLIBRARIES += libtesseract_opencl.la
-
-libtesseract_opencl_la_SOURCES = src/opencl/openclwrapper.cpp
-endif
-
 # Rules for src/textord.
 
 noinst_HEADERS += src/textord/alignedblob.h
@@ -743,16 +719,12 @@ tesseract_CPPFLAGS += -I$(top_srcdir)/src/dict
 tesseract_CPPFLAGS += -I$(top_srcdir)/src/textord
 tesseract_CPPFLAGS += -I$(top_srcdir)/src/viewer
 tesseract_CPPFLAGS += -I$(top_srcdir)/src/wordrec
-if OPENCL
-tesseract_CPPFLAGS += -I$(top_srcdir)/src/opencl
-endif
 tesseract_CPPFLAGS += $(AM_CPPFLAGS)
 if VISIBILITY
 tesseract_CPPFLAGS += -DTESS_IMPORTS
 endif
 
-tesseract_LDFLAGS = $(OPENCL_LDFLAGS)
-tesseract_LDFLAGS += $(OPENMP_CXXFLAGS)
+tesseract_LDFLAGS = $(OPENMP_CXXFLAGS)
 
 tesseract_LDADD = libtesseract.la
 tesseract_LDADD += $(LEPTONICA_LIBS)
@@ -927,7 +899,6 @@ EXTRA_PROGRAMS += $(trainingtools)
 extralib = libtesseract.la
 extralib += $(libarchive_LIBS)
 extralib += $(LEPTONICA_LIBS)
-extralib += $(OPENCL_LDFLAGS)
 extralib += $(TENSORFLOW_LIBS)
 if T_WIN
 extralib += -lws2_32
@@ -1308,7 +1279,7 @@ TESTS = $(check_PROGRAMS)
 
 apiexample_test_SOURCES = unittest/apiexample_test.cc
 apiexample_test_CPPFLAGS = $(unittest_CPPFLAGS)
-apiexample_test_LDFLAGS = $(OPENCL_LDFLAGS) $(LEPTONICA_LIBS)
+apiexample_test_LDFLAGS = $(LEPTONICA_LIBS)
 apiexample_test_LDADD = $(TESS_LIBS) $(LEPTONICA_LIBS)
 
 if !DISABLED_LEGACY_ENGINE
@@ -1494,7 +1465,7 @@ endif # !DISABLED_LEGACY_ENGINE
 
 progress_test_SOURCES = unittest/progress_test.cc
 progress_test_CPPFLAGS = $(unittest_CPPFLAGS)
-progress_test_LDFLAGS = $(OPENCL_LDFLAGS) $(LEPTONICA_LIBS)
+progress_test_LDFLAGS = $(LEPTONICA_LIBS)
 progress_test_LDADD = $(GTEST_LIBS) $(GMOCK_LIBS) $(TESS_LIBS) $(LEPTONICA_LIBS)
 
 qrsequence_test_SOURCES = unittest/qrsequence_test.cc

cmake/Configure.cmake

@@ -91,8 +91,6 @@ set(include_files_list
     unistd.h
 
     cairo/cairo-version.h
-    CL/cl.h
-    OpenCL/cl.h
     pango-1.0/pango/pango-features.h
     unicode/uchar.h
 )
@@ -121,7 +119,6 @@ file(APPEND ${AUTOCONFIG_SRC} "
 #cmakedefine HAVE_NEON ${HAVE_NEON}
 #cmakedefine HAVE_LIBARCHIVE ${HAVE_LIBARCHIVE}
 #cmakedefine HAVE_LIBCURL ${HAVE_LIBCURL}
-#cmakedefine USE_OPENCL ${USE_OPENCL}
 ")
 
 if(TESSDATA_PREFIX)

cmake/SourceGroups.cmake

@@ -31,7 +31,6 @@ source_group("classify"     "${SSRC}/classify/${H_CPP}")
 source_group("cutil"        "${SSRC}/cutil/${H_CPP}")
 source_group("dict"         "${SSRC}/dict/${H_CPP}")
 source_group("lstm"         "${SSRC}/lstm/${H_CPP}")
-source_group("opencl"       "${SSRC}/opencl/${H_CPP}")
 source_group("textord"      "${SSRC}/textord/${H_CPP}")
 source_group("viewer"       "${SSRC}/viewer/${H_CPP}")
 source_group("wordrec"      "${SSRC}/wordrec/${H_CPP}")

configure.ac

@@ -79,8 +79,6 @@ AC_SUBST([AM_CPPFLAGS])
 # Can be overridden with `configure --disable-silent-rules` or with `make V=1`.
 AM_SILENT_RULES([yes])
 
-OPENCL_INC="/opt/AMDAPP/include"
-OPENCL_LIBS="-lOpenCL"
 #############################
 #
 # Platform specific setup
@@ -102,15 +100,12 @@ case "${host_os}" in
         AM_CONDITIONAL([ADD_RT], true)
         ;;
     *darwin*)
-        OPENCL_LIBS=""
-        OPENCL_INC=""
         AM_CONDITIONAL([ADD_RT], false)
         ;;
     *android*|openbsd*)
         AM_CONDITIONAL([ADD_RT], false)
         ;;
     powerpc-*-darwin*)
-        OPENCL_LIBS=""
         ;;
     *)
         # default
@@ -263,19 +258,6 @@ have_tiff=false
 # Note that the first usage of AC_CHECK_HEADERS must be unconditional.
 AC_CHECK_HEADERS([tiffio.h], [have_tiff=true], [have_tiff=false])
 
-# check whether to build opencl version
-AC_MSG_CHECKING([--enable-opencl argument])
-AC_ARG_ENABLE([opencl],
-    AS_HELP_STRING([--enable-opencl], [enable opencl build [default=no]]))
-AC_MSG_RESULT([$enable_opencl])
-# check for opencl header
-have_opencl=false
-if test "$enable_opencl" = "yes"; then
-  AC_CHECK_HEADERS([CL/cl.h], [have_opencl=true], [
-    AC_CHECK_HEADERS(OpenCL/cl.h, [have_opencl=true], [have_opencl=false])
-  ])
-fi
-
 # Configure arguments which allow disabling some optional libraries.
 AC_ARG_WITH([archive],
             AS_HELP_STRING([--with-archive],
@@ -323,46 +305,18 @@ m4_define([MY_CHECK_FRAMEWORK],
    fi]
 )
 
-have_opencl_lib=false
-OPENCL_CPPFLAGS=''
-OPENCL_LDFLAGS=''
 case "${host_os}" in
   *darwin* | *-macos10*)
     MY_CHECK_FRAMEWORK([Accelerate])
     if test $my_cv_framework_Accelerate = yes; then
       AM_CPPFLAGS="-DHAVE_FRAMEWORK_ACCELERATE $AM_CPPFLAGS"
       AM_LDFLAGS="$AM_LDFLAGS -framework Accelerate"
     fi
-    MY_CHECK_FRAMEWORK([OpenCL])
-    if test "$enable_opencl" = "yes"; then
-      if test $my_cv_framework_OpenCL = no; then
-        AC_MSG_ERROR([Required OpenCL library not found!])
-      fi
-      AM_CPPFLAGS="-DUSE_OPENCL $AM_CPPFLAGS"
-      OPENCL_CPPFLAGS=""
-      OPENCL_LDFLAGS="-framework OpenCL"
-    fi
     ;;
   *)
     # default
-    if test "$enable_opencl" = "yes"; then
-        AC_CHECK_LIB([OpenCL], [clGetPlatformIDs],
-                     [have_opencl_lib=true], [have_opencl_lib=false])
-        if !($have_opencl); then
-            AC_MSG_ERROR([Required OpenCL headers not found!])
-        fi
-        if !($have_opencl_lib); then
-            AC_MSG_ERROR([Required OpenCL library not found!])
-        fi
-        AM_CPPFLAGS="-DUSE_OPENCL $AM_CPPFLAGS"
-        OPENCL_CPPFLAGS="-I${OPENCL_INC}"
-        OPENCL_LDFLAGS="${OPENCL_LIBS}"
-    fi
     ;;
 esac
-AM_CONDITIONAL([OPENCL], [test "$enable_opencl" = "yes"])
-AC_SUBST([OPENCL_CPPFLAGS])
-AC_SUBST([OPENCL_LDFLAGS])
 
 # check whether to build tesseract with -fvisibility=hidden -fvisibility-inlines-hidden
 # http://gcc.gnu.org/wiki/Visibility

include/tesseract/baseapi.h

@@ -86,15 +86,6 @@ class TESS_API TessBaseAPI {
    */
   static const char *Version();
 
-  /**
-   * If compiled with OpenCL AND an available OpenCL
-   * device is deemed faster than serial code, then
-   * "device" is populated with the cl_device_id
-   * and returns sizeof(cl_device_id)
-   * otherwise *device=nullptr and returns 0.
-   */
-  static size_t getOpenCLDevice(void **device);
-
   /**
    * Set the name of the input file. Needed for training and
    * reading a UNLV zone file, and for searchable PDF output.

include/tesseract/capi.h

@@ -186,8 +186,6 @@ TESS_API int TessResultRendererImageNum(TessResultRenderer *renderer);
 TESS_API TessBaseAPI *TessBaseAPICreate();
 TESS_API void TessBaseAPIDelete(TessBaseAPI *handle);
 
-TESS_API size_t TessBaseAPIGetOpenCLDevice(TessBaseAPI *handle, void **device);
-
 TESS_API void TessBaseAPISetInputName(TessBaseAPI *handle, const char *name);
 TESS_API const char *TessBaseAPIGetInputName(TessBaseAPI *handle);
 

src/api/baseapi.cpp

@@ -41,9 +41,6 @@
 #endif
 #include "mutableiterator.h" // for MutableIterator
 #include "normalis.h"        // for kBlnBaselineOffset, kBlnXHeight
-#if defined(USE_OPENCL)
-#  include "openclwrapper.h" // for OpenclDevice
-#endif
 #include "pageres.h"         // for PAGE_RES_IT, WERD_RES, PAGE_RES, CR_DE...
 #include "paragraphs.h"      // for DetectParagraphs
 #include "params.h"          // for BoolParam, IntParam, DoubleParam, Stri...
@@ -243,27 +240,6 @@ const char *TessBaseAPI::Version() {
   return TESSERACT_VERSION_STR;
 }
 
-/**
- * If compiled with OpenCL AND an available OpenCL
- * device is deemed faster than serial code, then
- * "device" is populated with the cl_device_id
- * and returns sizeof(cl_device_id)
- * otherwise *device=nullptr and returns 0.
- */
-size_t TessBaseAPI::getOpenCLDevice(void **data) {
-#ifdef USE_OPENCL
-  ds_device device = OpenclDevice::getDeviceSelection();
-  if (device.type == DS_DEVICE_OPENCL_DEVICE) {
-    *data = new cl_device_id;
-    memcpy(*data, &device.oclDeviceID, sizeof(cl_device_id));
-    return sizeof(cl_device_id);
-  }
-#endif
-
-  *data = nullptr;
-  return 0;
-}
-
 /**
  * Set the name of the input file. Needed only for training and
  * loading a UNLV zone file.
@@ -398,10 +374,6 @@ int TessBaseAPI::Init(const char *data, int data_size, const char *language, Ocr
     delete tesseract_;
     tesseract_ = nullptr;
   }
-#ifdef USE_OPENCL
-  OpenclDevice od;
-  od.InitEnv();
-#endif
   bool reset_classifier = true;
   if (tesseract_ == nullptr) {
     reset_classifier = false;

src/api/capi.cpp

@@ -137,10 +137,6 @@ void TessBaseAPIDelete(TessBaseAPI *handle) {
   delete handle;
 }
 
-size_t TessBaseAPIGetOpenCLDevice(TessBaseAPI * /*handle*/, void **device) {
-  return TessBaseAPI::getOpenCLDevice(device);
-}
-
 void TessBaseAPISetInputName(TessBaseAPI *handle, const char *name) {
   handle->SetInputName(name);
 }