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// Copyright (c) 2005-2008 INRIA Sophia-Antipolis (France).
// 2008 GeometryFactory
// All rights reserved.
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1/CGAL_ImageIO/include/CGAL/IO/read_vtk_image_data.h $
// $Id: include/CGAL/IO/read_vtk_image_data.h b26b07a1242 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
//
// Author(s) : Laurent Rineau, Pierre Alliez
#ifndef CGAL_IO_READ_VTK_IMAGE_DATA_H
#define CGAL_IO_READ_VTK_IMAGE_DATA_H
#include <CGAL/Image_3.h>
#include <CGAL/Image_3_vtk_interface.h>
namespace CGAL {
namespace {
struct VTK_to_ImageIO_type_mapper {
WORD_KIND wordKind;
SIGN sign;
unsigned int wdim;
};
static const VTK_to_ImageIO_type_mapper VTK_to_ImageIO_type[VTK_ID_TYPE] =
{ { WK_UNKNOWN, SGN_UNKNOWN, 0}, // 0=VTK_VOID
{ WK_UNKNOWN, SGN_UNKNOWN, 0}, // 1=VTK_BIT
{ WK_FIXED, SGN_SIGNED, 1}, // 2=VTK_CHAR
{ WK_FIXED, SGN_UNSIGNED, 1}, // 3=VTK_UNSIGNED_CHAR
{ WK_FIXED, SGN_SIGNED, 2}, // 4=VTK_SHORT
{ WK_FIXED, SGN_UNSIGNED, 2}, // 5=VTK_UNSIGNED_SHORT
{ WK_FIXED, SGN_SIGNED, 4}, // 6=VTK_INT
{ WK_FIXED, SGN_UNSIGNED, 4}, // 7=VTK_UNSIGNED_INT
{ WK_FIXED, SGN_SIGNED, 8}, // 8=VTK_LONG
{ WK_FIXED, SGN_UNSIGNED, 8}, // 9=VTK_UNSIGNED_LONG
{ WK_FLOAT, SGN_SIGNED, 4}, // 10=VTK_FLOAT
{ WK_FIXED, SGN_SIGNED, 8} // 11=VTK_DOUBLE
};
} //end anonymous namespace
namespace IO {
inline
Image_3
read_vtk_image_data(vtkImageData* vtk_image, Image_3::Own owning = Image_3::OWN_THE_DATA)
{
if(!vtk_image)
return Image_3();
_image* image = ::_initImage();
const int* dims = vtk_image->GetDimensions();
const double* spacing = vtk_image->GetSpacing();
const double* offset = vtk_image->GetOrigin();
image->vectMode = VM_SCALAR;
image->xdim = dims[0];
image->ydim = dims[1];
image->zdim = dims[2];
image->vdim = 1;
image->vx = (spacing[0] == 0) ? 1 : spacing[0];
image->vy = (spacing[1] == 0) ? 1 : spacing[1];
image->vz = (spacing[2] == 0) ? 1 : spacing[2];
image->tx = static_cast<float>(offset[0]);
image->ty = static_cast<float>(offset[1]);
image->tz = static_cast<float>(offset[2]);
image->endianness = ::_getEndianness();
int vtk_type = vtk_image->GetScalarType();
if(vtk_type == VTK_SIGNED_CHAR) vtk_type = VTK_CHAR;
if(vtk_type < 0 || vtk_type > VTK_DOUBLE) vtk_type = VTK_DOUBLE;
const VTK_to_ImageIO_type_mapper& imageio_type = VTK_to_ImageIO_type[vtk_type];
image->wdim = imageio_type.wdim;
image->wordKind = imageio_type.wordKind;
image->sign = imageio_type.sign;
const int cn = vtk_image->GetNumberOfScalarComponents();
if (!vtk_image->GetPointData() || !vtk_image->GetPointData()->GetScalars()) {
::_freeImage(image);
return Image_3();
}
// If there is more than a scalar per point, vtk_image->data is not immediately
// interpretable in Image_3->data
CGAL_assertion(owning == Image_3::OWN_THE_DATA || cn == 1);
CGAL_assertion(vtk_image->GetPointData()->GetScalars()->GetNumberOfTuples() == static_cast<vtkIdType>(image->xdim*image->ydim*image->zdim));
if(owning == Image_3::OWN_THE_DATA) {
std::size_t dims_n = image->xdim*image->ydim*image->zdim;
image->data = ::ImageIO_alloc(dims_n * image->wdim);
// std::cerr << "GetNumberOfTuples() = " << vtk_image->GetPointData()->GetScalars()->GetNumberOfTuples() << "\n"
// << "components = " << cn << "\n"
// << "wdim = " << image->wdim << "\n"
// << "image->size() = " << dims_n << std::endl;
if(cn == 1) {
vtk_image->GetPointData()->GetScalars()->ExportToVoidPointer(image->data);
} else {
std::cerr << "Warning: input has " << cn << " components; only the value of the first component will be used." << std::endl;
CGAL_assertion(cn >= 3); // if it's more than 1, it needs to be at least 3
// cast the data void pointers to make it possible to do pointer arithmetic
char* src = static_cast<char*>(vtk_image->GetPointData()->GetScalars()->GetVoidPointer(0));
char* dest = static_cast<char*>(image->data);
for(std::size_t i=0; i<dims_n; ++i)
{
// multiply by image->wdim because we casted to char* and not the actual data type
memcpy(dest + image->wdim*i, src + cn*image->wdim*i, image->wdim);
// Check that we are not discarding useful data (i.e., green & blue are identical to red)
CGAL_assertion(memcmp(src + cn*image->wdim*i, src + cn*image->wdim*i + image->wdim, image->wdim) == 0);
CGAL_assertion(memcmp(src + cn*image->wdim*i, src + cn*image->wdim*i + 2*image->wdim, image->wdim) == 0);
}
}
} else {
image->data = vtk_image->GetPointData()->GetScalars()->GetVoidPointer(0);
}
return Image_3(image, owning);
}
} // namespace IO
#ifndef CGAL_NO_DEPRECATED_CODE
using IO::read_vtk_image_data;
#endif
} // namespace CGAL
#endif // CGAL_IO_READ_VTK_IMAGE_DATA_H
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