message: core: emit more clear messages in OutputArray::create()
diff: @@ -1247,6 +1247,7 @@ void _OutputArray::create(int d, const int* sizes, int mtype, int i,
  {
  CV_Assert( i < 0 );
  Mat& m = *(Mat*)obj;
  + CV_Assert(!(m.empty() && fixedType() && fixedSize()) && "Can't reallocate empty Mat with locked layout (probably due to misused 'const' modifier)");
  if (allowTransposed && !m.empty() &&
  d == 2 && m.dims == 2 &&
  m.type() == mtype && m.rows == sizes[1] && m.cols == sizes[0] &&
  @@ -1260,13 +1261,13 @@ void _OutputArray::create(int d, const int* sizes, int mtype, int i,
  if(CV_MAT_CN(mtype) == m.channels() && ((1 << CV_MAT_TYPE(flags)) & fixedDepthMask) != 0 )
  mtype = m.type();
  else
  - CV_CheckTypeEQ(m.type(), CV_MAT_TYPE(mtype), "");
  + CV_CheckTypeEQ(m.type(), CV_MAT_TYPE(mtype), "Can't reallocate Mat with locked type (probably due to misused 'const' modifier)");
  }
  if(fixedSize())
  {
  - CV_CheckEQ(m.dims, d, "");
  + CV_CheckEQ(m.dims, d, "Can't reallocate Mat with locked size (probably due to misused 'const' modifier)");
  for(int j = 0; j < d; ++j)
  - CV_CheckEQ(m.size[j], sizes[j], "");
  + CV_CheckEQ(m.size[j], sizes[j], "Can't reallocate Mat with locked size (probably due to misused 'const' modifier)");
  }
  m.create(d, sizes, mtype);
  return;
  @@ -1276,6 +1277,7 @@ void _OutputArray::create(int d, const int* sizes, int mtype, int i,
  {
  CV_Assert( i < 0 );
  UMat& m = *(UMat*)obj;
  + CV_Assert(!(m.empty() && fixedType() && fixedSize()) && "Can't reallocate empty UMat with locked layout (probably due to misused 'const' modifier)");
  if (allowTransposed && !m.empty() &&
  d == 2 && m.dims == 2 &&
  m.type() == mtype && m.rows == sizes[1] && m.cols == sizes[0] &&
  @@ -1289,13 +1291,13 @@ void _OutputArray::create(int d, const int* sizes, int mtype, int i,
  if(CV_MAT_CN(mtype) == m.channels() && ((1 << CV_MAT_TYPE(flags)) & fixedDepthMask) != 0 )
  mtype = m.type();
  else
  - CV_CheckTypeEQ(m.type(), CV_MAT_TYPE(mtype), "");
  + CV_CheckTypeEQ(m.type(), CV_MAT_TYPE(mtype), "Can't reallocate UMat with locked type (probably due to misused 'const' modifier)");
  }
  if(fixedSize())
  {
  - CV_CheckEQ(m.dims, d, "");
  + CV_CheckEQ(m.dims, d, "Can't reallocate UMat with locked size (probably due to misused 'const' modifier)");
  for(int j = 0; j < d; ++j)
  - CV_CheckEQ(m.size[j], sizes[j], "");
  + CV_CheckEQ(m.size[j], sizes[j], "Can't reallocate UMat with locked size (probably due to misused 'const' modifier)");
  }
  m.create(d, sizes, mtype);
  return;
  