64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
//============================================================================
|
|
// Copyright (c) Kitware, Inc.
|
|
// All rights reserved.
|
|
// See LICENSE.txt for details.
|
|
//
|
|
// This software is distributed WITHOUT ANY WARRANTY; without even
|
|
// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
|
// PURPOSE. See the above copyright notice for more information.
|
|
//============================================================================
|
|
|
|
#include <vtkm/io/ImageWriterPNM.h>
|
|
|
|
#include <vtkm/io/PixelTypes.h>
|
|
|
|
namespace vtkm
|
|
{
|
|
namespace io
|
|
{
|
|
|
|
ImageWriterPNM::~ImageWriterPNM() noexcept {}
|
|
|
|
void ImageWriterPNM::Write(vtkm::Id width, vtkm::Id height, const ColorArrayType& pixels)
|
|
{
|
|
switch (this->Depth)
|
|
{
|
|
case PixelDepth::PIXEL_8:
|
|
this->WriteToFile<vtkm::io::RGBPixel_8>(width, height, pixels);
|
|
break;
|
|
case PixelDepth::PIXEL_16:
|
|
WriteToFile<vtkm::io::RGBPixel_16>(width, height, pixels);
|
|
break;
|
|
}
|
|
}
|
|
|
|
template <typename PixelType>
|
|
void ImageWriterPNM::WriteToFile(vtkm::Id width, vtkm::Id height, const ColorArrayType& pixels)
|
|
{
|
|
std::ofstream outStream(this->FileName.c_str(), std::ios_base::binary | std::ios_base::out);
|
|
outStream << "P6\n" << width << " " << height << "\n";
|
|
|
|
outStream << PixelType::MAX_COLOR_VALUE << "\n";
|
|
auto pixelPortal = pixels.ReadPortal();
|
|
|
|
vtkm::UInt32 imageSize =
|
|
static_cast<vtkm::UInt32>(pixels.GetNumberOfValues() * PixelType::BYTES_PER_PIXEL);
|
|
std::vector<unsigned char> imageData(imageSize);
|
|
|
|
// Write out the data starting from the end (Images are stored Bottom-Left to Top-Right,
|
|
// but are viewed from Top-Left to Bottom-Right)
|
|
vtkm::Id pnmIndex = 0;
|
|
for (vtkm::Id yIndex = height - 1; yIndex >= 0; yIndex--)
|
|
{
|
|
for (vtkm::Id xIndex = 0; xIndex < width; xIndex++, pnmIndex++)
|
|
{
|
|
vtkm::Id vtkmIndex = yIndex * width + xIndex;
|
|
PixelType(pixelPortal.Get(vtkmIndex)).FillImageAtIndexWithPixel(imageData.data(), pnmIndex);
|
|
}
|
|
}
|
|
outStream.write((char*)imageData.data(), imageSize);
|
|
outStream.close();
|
|
}
|
|
}
|
|
} // namespace vtkm::io
|