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vtkJSONDataSetWriter.cxx
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vtkJSONDataSetWriter.cxx
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// SPDX-FileCopyrightText: Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
// SPDX-License-Identifier: BSD-3-Clause
#include "vtkJSONDataSetWriter.h"
#include "vtkArchiver.h"
#include "vtkCellArray.h"
#include "vtkCellData.h"
#include "vtkDataArray.h"
#include "vtkDataSet.h"
#include "vtkDataSetAttributes.h"
#include "vtkIdTypeArray.h"
#include "vtkImageData.h"
#include "vtkInformation.h"
#include "vtkMatrix3x3.h"
#include "vtkNew.h"
#include "vtkObjectFactory.h"
#include "vtkPointData.h"
#include "vtkPolyData.h"
#include "vtkSmartPointer.h"
#include "vtkTypeInt32Array.h"
#include "vtkTypeInt64Array.h"
#include "vtkTypeUInt32Array.h"
#include "vtkTypeUInt64Array.h"
#include "vtksys/FStream.hxx"
#include "vtksys/MD5.h"
#include "vtksys/SystemTools.hxx"
#include <fstream>
#include <sstream>
#include <string>
//------------------------------------------------------------------------------
VTK_ABI_NAMESPACE_BEGIN
vtkStandardNewMacro(vtkJSONDataSetWriter);
vtkCxxSetObjectMacro(vtkJSONDataSetWriter, Archiver, vtkArchiver);
//------------------------------------------------------------------------------
vtkJSONDataSetWriter::vtkJSONDataSetWriter()
{
this->Archiver = vtkArchiver::New();
this->ValidStringCount = 1;
}
//------------------------------------------------------------------------------
vtkJSONDataSetWriter::~vtkJSONDataSetWriter()
{
this->SetArchiver(nullptr);
}
//------------------------------------------------------------------------------
vtkDataSet* vtkJSONDataSetWriter::GetInput()
{
return vtkDataSet::SafeDownCast(this->Superclass::GetInput());
}
//------------------------------------------------------------------------------
vtkDataSet* vtkJSONDataSetWriter::GetInput(int port)
{
return vtkDataSet::SafeDownCast(this->Superclass::GetInput(port));
}
//------------------------------------------------------------------------------
std::string vtkJSONDataSetWriter::WriteDataSetAttributes(
vtkDataSetAttributes* fields, const char* className)
{
int nbArrayWritten = 0;
vtkIdType activeTCoords = -1;
vtkIdType activeScalars = -1;
vtkIdType activeNormals = -1;
vtkIdType activeGlobalIds = -1;
vtkIdType activeTensors = -1;
vtkIdType activePedigreeIds = -1;
vtkIdType activeVectors = -1;
vtkIdType nbFields = fields->GetNumberOfArrays();
if (nbFields == 0)
{
return "";
}
std::stringstream jsonSnippet;
jsonSnippet << " \"" << className << "\": {"
<< "\n \"vtkClass\": \"vtkDataSetAttributes\","
<< "\n \"arrays\": [\n";
for (vtkIdType idx = 0; idx < nbFields; idx++)
{
vtkDataArray* field = fields->GetArray(idx);
if (field == nullptr)
{
continue;
}
if (nbArrayWritten)
{
jsonSnippet << ",\n";
}
jsonSnippet << " { \"data\": " << this->WriteArray(field, "vtkDataArray") << "}";
// Update active field if any
activeTCoords = field == fields->GetTCoords() ? nbArrayWritten : activeTCoords;
activeScalars = field == fields->GetScalars() ? nbArrayWritten : activeScalars;
activeNormals = field == fields->GetNormals() ? nbArrayWritten : activeNormals;
activeGlobalIds = field == fields->GetGlobalIds() ? nbArrayWritten : activeGlobalIds;
activeTensors = field == fields->GetTensors() ? nbArrayWritten : activeTensors;
activePedigreeIds = field == fields->GetPedigreeIds() ? nbArrayWritten : activePedigreeIds;
activeVectors = field == fields->GetVectors() ? nbArrayWritten : activeVectors;
// Increment the number of array currently in the list
nbArrayWritten++;
}
jsonSnippet << "\n ],\n"
<< " \"activeTCoords\": " << activeTCoords << ",\n"
<< " \"activeScalars\": " << activeScalars << ",\n"
<< " \"activeNormals\": " << activeNormals << ",\n"
<< " \"activeGlobalIds\": " << activeGlobalIds << ",\n"
<< " \"activeTensors\": " << activeTensors << ",\n"
<< " \"activePedigreeIds\": " << activePedigreeIds << ",\n"
<< " \"activeVectors\": " << activeVectors << "\n"
<< " }";
return jsonSnippet.str();
}
//------------------------------------------------------------------------------
std::string vtkJSONDataSetWriter::WriteArray(
vtkDataArray* array, const char* className, const char* arrayName)
{
bool needConvert;
std::string id = vtkJSONDataSetWriter::GetUID(array, needConvert);
std::stringstream arrayPath;
arrayPath << "data/" << id;
bool success = vtkJSONDataSetWriter::WriteArrayContents(array, arrayPath.str().c_str());
if (!success)
{
return "{}";
}
const char* INDENT = " ";
std::stringstream ss;
ss << "{\n"
<< INDENT << " \"vtkClass\": \"" << className << "\",\n"
<< INDENT << " \"name\": \""
<< this->GetValidString(arrayName == nullptr ? array->GetName() : arrayName) << "\",\n"
<< INDENT << " \"numberOfComponents\": " << array->GetNumberOfComponents() << ",\n"
<< INDENT << " \"dataType\": \"" << vtkJSONDataSetWriter::GetShortType(array, needConvert)
<< "Array\",\n"
<< INDENT << " \"ref\": {\n"
<< INDENT << " \"encode\": \"LittleEndian\",\n"
<< INDENT << " \"basepath\": \"data\",\n"
<< INDENT << " \"id\": \"" << id << "\"\n"
<< INDENT << " },\n"
<< INDENT << " \"size\": " << array->GetNumberOfValues() << "\n"
<< INDENT << "}";
return ss.str();
}
//------------------------------------------------------------------------------
void vtkJSONDataSetWriter::Write(vtkDataSet* dataset)
{
vtkImageData* imageData = vtkImageData::SafeDownCast(dataset);
vtkPolyData* polyData = vtkPolyData::SafeDownCast(dataset);
this->ValidDataSet = false;
// Get input and check data
if (dataset == nullptr)
{
vtkErrorMacro(<< "No data to write!");
return;
}
// Capture vtkDataSet definition
std::stringstream metaJsonFile;
metaJsonFile << "{\n";
metaJsonFile << " \"vtkClass\": \"" << dataset->GetClassName() << "\"";
// ImageData
if (imageData)
{
this->ValidDataSet = true;
// Spacing
metaJsonFile << ",\n \"spacing\": [" << imageData->GetSpacing()[0] << ", "
<< imageData->GetSpacing()[1] << ", " << imageData->GetSpacing()[2] << "]";
// Origin
metaJsonFile << ",\n \"origin\": [" << imageData->GetOrigin()[0] << ", "
<< imageData->GetOrigin()[1] << ", " << imageData->GetOrigin()[2] << "]";
// Extent
metaJsonFile << ",\n \"extent\": [" << imageData->GetExtent()[0] << ", "
<< imageData->GetExtent()[1] << ", " << imageData->GetExtent()[2] << ", "
<< imageData->GetExtent()[3] << ", " << imageData->GetExtent()[4] << ", "
<< imageData->GetExtent()[5] << "]";
// Direction
// Write the matrix using vtk.js convention for direction matrices (transpose the matrix)
auto direction = imageData->GetDirectionMatrix()->GetData();
metaJsonFile << ",\n \"direction\": [" << direction[0] << ", " << direction[3] << ", "
<< direction[6] << ", " << direction[1] << ", " << direction[4] << ", "
<< direction[7] << ", " << direction[2] << ", " << direction[5] << ", "
<< direction[8] << "]";
}
// PolyData
if (polyData && polyData->GetPoints())
{
this->ValidDataSet = true;
vtkPoints* points = polyData->GetPoints();
metaJsonFile << ",\n \"points\": "
<< this->WriteArray(points->GetData(), "vtkPoints", "points");
// Verts
vtkNew<vtkIdTypeArray> cells;
polyData->GetVerts()->ExportLegacyFormat(cells);
if (cells->GetNumberOfValues())
{
metaJsonFile << ",\n \"verts\": " << this->WriteArray(cells, "vtkCellArray", "verts");
}
// Lines
polyData->GetLines()->ExportLegacyFormat(cells);
if (cells->GetNumberOfValues())
{
metaJsonFile << ",\n \"lines\": " << this->WriteArray(cells, "vtkCellArray", "lines");
}
// Strips
polyData->GetStrips()->ExportLegacyFormat(cells);
if (cells->GetNumberOfValues())
{
metaJsonFile << ",\n \"strips\": " << this->WriteArray(cells, "vtkCellArray", "strips");
}
// Polys
polyData->GetPolys()->ExportLegacyFormat(cells);
if (cells->GetNumberOfValues())
{
metaJsonFile << ",\n \"polys\": " << this->WriteArray(cells, "vtkCellArray", "polys");
}
}
// PointData
bool isEmpty = true;
std::string fieldJSON = this->WriteDataSetAttributes(dataset->GetPointData(), "pointData");
if (!fieldJSON.empty())
{
isEmpty = false;
metaJsonFile << ",\n" << fieldJSON;
}
// CellData
fieldJSON = this->WriteDataSetAttributes(dataset->GetCellData(), "cellData");
if (!fieldJSON.empty())
{
isEmpty = false;
metaJsonFile << ",\n" << fieldJSON;
}
metaJsonFile << "}\n";
// Create archive only if there's actually something to write
if (this->ValidDataSet || !isEmpty)
{
this->GetArchiver()->OpenArchive();
std::string metaJsonFileStr = metaJsonFile.str();
this->GetArchiver()->InsertIntoArchive(
"index.json", metaJsonFileStr.c_str(), metaJsonFileStr.size());
this->GetArchiver()->CloseArchive();
}
}
//------------------------------------------------------------------------------
void vtkJSONDataSetWriter::WriteData()
{
vtkDataSet* dataset = this->GetInput();
this->Write(dataset);
}
//------------------------------------------------------------------------------
bool vtkJSONDataSetWriter::WriteArrayContents(vtkDataArray* input, const char* filePath)
{
if (input->GetDataTypeSize() == 0)
{
// Skip BIT arrays
return false;
}
// Check if we need to convert the (u)int64 to (u)int32
vtkSmartPointer<vtkDataArray> arrayToWrite = input;
vtkIdType arraySize = input->GetNumberOfTuples() * input->GetNumberOfComponents();
switch (input->GetDataType())
{
case VTK_UNSIGNED_CHAR:
case VTK_UNSIGNED_LONG:
case VTK_UNSIGNED_LONG_LONG:
if (input->GetDataTypeSize() > 4)
{
vtkNew<vtkTypeUInt64Array> srcUInt64;
srcUInt64->ShallowCopy(input);
vtkNew<vtkTypeUInt32Array> uint32;
uint32->SetNumberOfValues(arraySize);
uint32->SetName(input->GetName());
for (vtkIdType i = 0; i < arraySize; i++)
{
uint32->SetValue(i, srcUInt64->GetValue(i));
}
arrayToWrite = uint32;
}
break;
case VTK_LONG:
case VTK_LONG_LONG:
case VTK_ID_TYPE:
if (input->GetDataTypeSize() > 4)
{
vtkNew<vtkTypeInt64Array> srcInt64;
srcInt64->ShallowCopy(input);
vtkNew<vtkTypeInt32Array> int32;
int32->SetNumberOfTuples(arraySize);
int32->SetName(input->GetName());
for (vtkIdType i = 0; i < arraySize; i++)
{
int32->SetValue(i, srcInt64->GetValue(i));
}
arrayToWrite = int32;
}
break;
default:
arrayToWrite = input;
break;
}
const char* content = (const char*)arrayToWrite->GetVoidPointer(0);
size_t size = arrayToWrite->GetNumberOfValues() * arrayToWrite->GetDataTypeSize();
this->GetArchiver()->InsertIntoArchive(filePath, content, size);
return true;
}
//------------------------------------------------------------------------------
namespace
{
class vtkSingleFileArchiver : public vtkArchiver
{
public:
static vtkSingleFileArchiver* New();
vtkTypeMacro(vtkSingleFileArchiver, vtkArchiver);
void OpenArchive() override {}
void CloseArchive() override {}
void InsertIntoArchive(const std::string& filePath, const char* data, std::size_t size) override
{
vtksys::ofstream file;
file.open(filePath.c_str(), ios::out | ios::binary);
file.write(data, size);
file.close();
}
private:
vtkSingleFileArchiver() = default;
~vtkSingleFileArchiver() override = default;
};
vtkStandardNewMacro(vtkSingleFileArchiver);
}
//------------------------------------------------------------------------------
bool vtkJSONDataSetWriter::WriteArrayAsRAW(vtkDataArray* array, const char* filePath)
{
vtkNew<vtkJSONDataSetWriter> writer;
vtkNew<vtkSingleFileArchiver> archiver;
writer->SetArchiver(archiver);
return writer->WriteArrayContents(array, filePath);
}
//------------------------------------------------------------------------------
void vtkJSONDataSetWriter::PrintSelf(ostream& os, vtkIndent indent)
{
this->Superclass::PrintSelf(os, indent);
}
//------------------------------------------------------------------------------
int vtkJSONDataSetWriter::FillInputPortInformation(int, vtkInformation* info)
{
info->Set(vtkAlgorithm::INPUT_REQUIRED_DATA_TYPE(), "vtkDataSet");
return 1;
}
//------------------------------------------------------------------------------
// Static helper functions
//------------------------------------------------------------------------------
void vtkJSONDataSetWriter::ComputeMD5(const unsigned char* content, int size, std::string& hash)
{
unsigned char digest[16];
char md5Hash[33];
md5Hash[32] = '\0';
vtksysMD5* md5 = vtksysMD5_New();
vtksysMD5_Initialize(md5);
vtksysMD5_Append(md5, content, size);
vtksysMD5_Finalize(md5, digest);
vtksysMD5_DigestToHex(digest, md5Hash);
vtksysMD5_Delete(md5);
hash = md5Hash;
}
//------------------------------------------------------------------------------
std::string vtkJSONDataSetWriter::GetShortType(vtkDataArray* input, bool& needConversion)
{
needConversion = false;
std::stringstream ss;
switch (input->GetDataType())
{
case VTK_UNSIGNED_CHAR:
case VTK_UNSIGNED_SHORT:
case VTK_UNSIGNED_INT:
case VTK_UNSIGNED_LONG:
case VTK_UNSIGNED_LONG_LONG:
ss << "Uint";
if (input->GetDataTypeSize() <= 4)
{
ss << (input->GetDataTypeSize() * 8);
}
else
{
needConversion = true;
ss << "32";
}
break;
case VTK_CHAR:
case VTK_SIGNED_CHAR:
case VTK_SHORT:
case VTK_INT:
case VTK_LONG:
case VTK_LONG_LONG:
case VTK_ID_TYPE:
ss << "Int";
if (input->GetDataTypeSize() <= 4)
{
ss << (input->GetDataTypeSize() * 8);
}
else
{
needConversion = true;
ss << "32";
}
break;
case VTK_FLOAT:
case VTK_DOUBLE:
ss << "Float";
ss << (input->GetDataTypeSize() * 8);
break;
case VTK_BIT:
case VTK_STRING:
case VTK_VARIANT:
default:
ss << "xxx";
break;
}
return ss.str();
}
//------------------------------------------------------------------------------
std::string vtkJSONDataSetWriter::GetUID(vtkDataArray* input, bool& needConversion)
{
const unsigned char* content = (const unsigned char*)input->GetVoidPointer(0);
int size = input->GetNumberOfValues() * input->GetDataTypeSize();
std::string hash;
vtkJSONDataSetWriter::ComputeMD5(content, size, hash);
std::stringstream ss;
ss << vtkJSONDataSetWriter::GetShortType(input, needConversion) << "_"
<< input->GetNumberOfValues() << "-" << hash;
return ss.str();
}
//------------------------------------------------------------------------------
std::string vtkJSONDataSetWriter::GetValidString(const char* name)
{
if (name != nullptr && strlen(name))
{
return name;
}
std::stringstream ss;
ss << "invalid_" << this->ValidStringCount++;
return ss.str();
}
VTK_ABI_NAMESPACE_END