message: gapi(test): avoid using of unstable random floating-point input
diff: @@ -74,7 +74,7 @@ public:
  cv::Scalar initScalarRandU(unsigned upper)
  {
  auto& rng = cv::theRNG();
  - double s1 = rng(upper);
  + double s1 = rng(upper); // FIXIT: RNG result is 'int', not double
  double s2 = rng(upper);
  double s3 = rng(upper);
  double s4 = rng(upper);
  @@ -97,8 +97,23 @@ public:
  sc = initScalarRandU(100);
  + // Details: https://github.com/opencv/opencv/pull/16083
  + //if (CV_MAT_DEPTH(type) < CV_32F)
  + if (1)
  + {
  cv::randu(in_mat1, cv::Scalar::all(0), cv::Scalar::all(255));
  cv::randu(in_mat2, cv::Scalar::all(0), cv::Scalar::all(255));
  + }
  + else
  + {
  + const int fscale = 256; // avoid bits near ULP, generate stable test input
  + Mat in_mat32s(in_mat1.size(), CV_MAKE_TYPE(CV_32S, CV_MAT_CN(type)));
  + cv::randu(in_mat32s, cv::Scalar::all(0), cv::Scalar::all(255 * fscale));
  + in_mat32s.convertTo(in_mat1, type, 1.0f / fscale, 0);
  +
  + cv::randu(in_mat32s, cv::Scalar::all(0), cv::Scalar::all(255 * fscale));
  + in_mat32s.convertTo(in_mat2, type, 1.0f / fscale, 0);
  + }
  if (createOutputMatrices)
  {
  @@ -111,7 +126,17 @@ public:
  in_mat1 = cv::Mat(sz_in, type);
  sc = initScalarRandU(100);
  + if (CV_MAT_DEPTH(type) < CV_32F)
  + {
  cv::randu(in_mat1, cv::Scalar::all(0), cv::Scalar::all(255));
  + }
  + else
  + {
  + const int fscale = 256; // avoid bits near ULP, generate stable test input
  + Mat in_mat32s(in_mat1.size(), CV_MAKE_TYPE(CV_32S, CV_MAT_CN(type)));
  + cv::randu(in_mat32s, cv::Scalar::all(0), cv::Scalar::all(255 * fscale));
  + in_mat32s.convertTo(in_mat1, type, 1.0f / fscale, 0);
  + }
  if (createOutputMatrices)
  {
  