core: rework code locality

- to reduce binaries size of FFmpeg Windows wrapper
- MinGW linker doesn't support -ffunction-sections (used for FFmpeg Windows wrapper)
- move code to improve locality with its used dependencies
- move UMat::dot() to matmul.dispatch.cpp (Mat::dot() is already there)
- move UMat::inv() to lapack.cpp
- move UMat::mul() to arithm.cpp
- move UMat:eye() to matrix_operations.cpp (near setIdentity() implementation)
- move normalize(): convert_scale.cpp => norm.cpp
- move convertAndUnrollScalar(): arithm.cpp => copy.cpp
- move scalarToRawData(): array.cpp => copy.cpp
- move transpose(): matrix_operations.cpp => matrix_transform.cpp
- move flip(), rotate(): copy.cpp => matrix_transform.cpp (rotate90 uses flip and transpose)
- add 'OPENCV_CORE_EXCLUDE_C_API' CMake variable to exclude compilation of C-API functions from the core module
- matrix_wrap.cpp: add compile-time checks for CUDA/OpenGL calls
- the steps above allow to reduce FFmpeg wrapper size for ~1.5Mb (initial size of OpenCV part is about 3Mb)

backport is done to improve merge experience (less conflicts)
backport of commit: 65eb946756

modules/core/src/umatrix.cpp

@@ -1259,88 +1259,6 @@ UMat UMat::t() const
     return m;
 }
 
-UMat UMat::inv(int method) const
-{
-    UMat m;
-    invert(*this, m, method);
-    return m;
-}
-
-UMat UMat::mul(InputArray m, double scale) const
-{
-    UMat dst;
-    multiply(*this, m, dst, scale);
-    return dst;
-}
-
-#ifdef HAVE_OPENCL
-
-static bool ocl_dot( InputArray _src1, InputArray _src2, double & res )
-{
-    UMat src1 = _src1.getUMat().reshape(1), src2 = _src2.getUMat().reshape(1);
-
-    int type = src1.type(), depth = CV_MAT_DEPTH(type),
-            kercn = ocl::predictOptimalVectorWidth(src1, src2);
-    bool doubleSupport = ocl::Device::getDefault().doubleFPConfig() > 0;
-
-    if ( !doubleSupport && depth == CV_64F )
-        return false;
-
-    int dbsize = ocl::Device::getDefault().maxComputeUnits();
-    size_t wgs = ocl::Device::getDefault().maxWorkGroupSize();
-    int ddepth = std::max(CV_32F, depth);
-
-    int wgs2_aligned = 1;
-    while (wgs2_aligned < (int)wgs)
-        wgs2_aligned <<= 1;
-    wgs2_aligned >>= 1;
-
-    char cvt[40];
-    ocl::Kernel k("reduce", ocl::core::reduce_oclsrc,
-                  format("-D srcT=%s -D srcT1=%s -D dstT=%s -D dstTK=%s -D ddepth=%d -D convertToDT=%s -D OP_DOT "
-                         "-D WGS=%d -D WGS2_ALIGNED=%d%s%s%s -D kercn=%d",
-                         ocl::typeToStr(CV_MAKE_TYPE(depth, kercn)), ocl::typeToStr(depth),
-                         ocl::typeToStr(ddepth), ocl::typeToStr(CV_MAKE_TYPE(ddepth, kercn)),
-                         ddepth, ocl::convertTypeStr(depth, ddepth, kercn, cvt),
-                         (int)wgs, wgs2_aligned, doubleSupport ? " -D DOUBLE_SUPPORT" : "",
-                         _src1.isContinuous() ? " -D HAVE_SRC_CONT" : "",
-                         _src2.isContinuous() ? " -D HAVE_SRC2_CONT" : "", kercn));
-    if (k.empty())
-        return false;
-
-    UMat db(1, dbsize, ddepth);
-
-    ocl::KernelArg src1arg = ocl::KernelArg::ReadOnlyNoSize(src1),
-            src2arg = ocl::KernelArg::ReadOnlyNoSize(src2),
-            dbarg = ocl::KernelArg::PtrWriteOnly(db);
-
-    k.args(src1arg, src1.cols, (int)src1.total(), dbsize, dbarg, src2arg);
-
-    size_t globalsize = dbsize * wgs;
-    if (k.run(1, &globalsize, &wgs, false))
-    {
-        res = sum(db.getMat(ACCESS_READ))[0];
-        return true;
-    }
-    return false;
-}
-
-#endif
-
-double UMat::dot(InputArray m) const
-{
-    CV_INSTRUMENT_REGION();
-
-    CV_Assert(m.sameSize(*this) && m.type() == type());
-
-#ifdef HAVE_OPENCL
-    double r = 0;
-    CV_OCL_RUN_(dims <= 2, ocl_dot(*this, m, r), r)
-#endif
-
-    return getMat(ACCESS_READ).dot(m);
-}
-
 UMat UMat::zeros(int rows, int cols, int type)
 {
     return UMat(rows, cols, type, Scalar::all(0));
@@ -1371,18 +1289,6 @@ UMat UMat::ones(int ndims, const int* sz, int type)
     return UMat(ndims, sz, type, Scalar(1));
 }
 
-UMat UMat::eye(int rows, int cols, int type)
-{
-    return UMat::eye(Size(cols, rows), type);
-}
-
-UMat UMat::eye(Size size, int type)
-{
-    UMat m(size, type);
-    setIdentity(m);
-    return m;
-}
-
 }
 
 /* End of file. */