added C= support; modified threading logic in threshold

CMakeLists.txt

@@ -132,6 +132,7 @@ OCV_OPTION(WITH_PVAPI          "Include Prosilica GigE support"              ON
 OCV_OPTION(WITH_QT             "Build with Qt Backend support"               OFF  IF (NOT ANDROID AND NOT IOS) )
 OCV_OPTION(WITH_QUICKTIME      "Use QuickTime for Video I/O insted of QTKit" OFF  IF APPLE )
 OCV_OPTION(WITH_TBB            "Include Intel TBB support"                   OFF  IF (NOT IOS) )
+OCV_OPTION(WITH_CSTRIPES       "Include C= support"                          OFF  IF WIN32 )
 OCV_OPTION(WITH_TIFF           "Include TIFF support"                        ON   IF (NOT IOS) )
 OCV_OPTION(WITH_UNICAP         "Include Unicap support (GPL)"                OFF  IF (UNIX AND NOT APPLE AND NOT ANDROID) )
 OCV_OPTION(WITH_V4L            "Include Video 4 Linux support"               ON   IF (UNIX AND NOT APPLE AND NOT ANDROID) )
@@ -746,6 +747,10 @@ if(DEFINED WITH_TBB)
   status("    Use TBB:"   HAVE_TBB   THEN "YES (ver ${TBB_VERSION_MAJOR}.${TBB_VERSION_MINOR} interface ${TBB_INTERFACE_VERSION})" ELSE NO)
 endif(DEFINED WITH_TBB)
 
+if(DEFINED WITH_CSTRIPES)
+  status("    Use C=:"   HAVE_CSTRIPES   THEN YES ELSE NO)
+endif(DEFINED WITH_CSTRIPES)
+
 if(DEFINED WITH_CUDA)
   status("    Use Cuda:"  HAVE_CUDA  THEN "YES (ver ${CUDA_VERSION_STRING})" ELSE NO)
 endif(DEFINED WITH_CUDA)

cmake/OpenCVDetectCStripes.cmake

@@ -0,0 +1,11 @@
+if(WIN32)
+    find_path( CSTRIPES_LIB_DIR
+               NAMES "С=.lib"
+               DOC "The path to C= lib and dll")
+    if(CSTRIPES_LIB_DIR)
+        ocv_include_directories("${CSTRIPES_LIB_DIR}/..")
+        link_directories("${CSTRIPES_LIB_DIR}")
+        set(OPENCV_LINKER_LIBS ${OPENCV_LINKER_LIBS} "С=")
+        set(HAVE_CSTRIPES 1)
+    endif()
+endif()

cmake/OpenCVFindLibsPerf.cmake

@@ -7,6 +7,11 @@ if(WITH_TBB)
   include("${OpenCV_SOURCE_DIR}/cmake/OpenCVDetectTBB.cmake")
 endif(WITH_TBB)
 
+# --- C= ---
+if(WITH_CSTRIPES)
+  include("${OpenCV_SOURCE_DIR}/cmake/OpenCVDetectCStripes.cmake")
+endif(WITH_CSTRIPES)
+
 # --- IPP ---
 ocv_clear_vars(IPP_FOUND)
 if(WITH_IPP)

cmake/templates/cvconfig.h.cmake

@@ -166,6 +166,9 @@
 /* Intel Threading Building Blocks */
 #cmakedefine  HAVE_TBB
 
+/* C= */
+#cmakedefine  HAVE_CSTRIPES
+
 /* Eigen Matrix & Linear Algebra Library */
 #cmakedefine  HAVE_EIGEN
 

modules/core/src/parallel.cpp

@@ -42,7 +42,7 @@
 
 #include "precomp.hpp"
 
-#if !defined HAVE_TBB && !defined HAVE_OPENMP && !defined HAVE_GCD && !defined HAVE_CONCURRENCY
+#if !defined HAVE_TBB && !defined HAVE_OPENMP && !defined HAVE_GCD && !defined HAVE_CONCURRENCY && !defined HAVE_CSTRIPES
     #ifdef __APPLE__
         #define HAVE_GCD
     #elif defined _MSC_VER && _MSC_VER >= 1600
@@ -66,7 +66,10 @@
     #else
         #undef HAVE_TBB
     #endif // end TBB version
-#endif // HAVE_CONCURRENCY
+#elif defined HAVE_CSTRIPES
+    #include "C=.h"
+    #undef shared
+#endif
 
 /*
     HAVE_TBB - using TBB
@@ -137,11 +140,22 @@ namespace cv
         for (int i = range.start; i < range.end; ++i)
             body(Range(i, i + 1));
 
-#elif defined (HAVE_GCD)
+#elif defined HAVE_GCD
 
         dispatch_queue_t concurrent_queue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
         dispatch_apply_f(range.end - range.start, concurrent_queue, &const_cast<ParallelLoopBody&>(body), block_function);
 
+#elif defined HAVE_CSTRIPES
+
+        parallel()
+        {
+            int offset = range.start;
+            int len = range.end - offset;
+            Range r(offset + CPX_RANGE_START(len), offset + CPX_RANGE_END(len));
+            body(r);
+            barrier();
+        }
+
 #else
 
         body(range);

modules/imgproc/src/thresh.cpp

@@ -730,11 +730,6 @@ double cv::threshold( InputArray _src, OutputArray _dst, double thresh, double m
     _dst.create( src.size(), src.type() );
     Mat dst = _dst.getMat();
 
-    int nStripes = 1;
-#if defined HAVE_TBB && defined ANDROID
-    nStripes = 4;
-#endif
-
     if( src.depth() == CV_8U )
     {
         int ithresh = cvFloor(thresh);
@@ -793,8 +788,10 @@ double cv::threshold( InputArray _src, OutputArray _dst, double thresh, double m
         ;
     else
         CV_Error( CV_StsUnsupportedFormat, "" );
-        
-    parallel_for_(Range(0, nStripes),
+    
+    size_t nStripes = (src.total() + (1<<15)) >> 16;
+    nStripes = MAX(MIN(nStripes, (size_t)4), (size_t)1);
+    parallel_for_(Range(0, (int)nStripes),
                   ThresholdRunner(src, dst, nStripes, thresh, maxval, type));
     return thresh;
 }