mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
64 lines
2.0 KiB
C++
64 lines
2.0 KiB
C++
//============================================================================
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// Copyright (c) Kitware, Inc.
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// All rights reserved.
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// See LICENSE.txt for details.
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//
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// This software is distributed WITHOUT ANY WARRANTY; without even
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// the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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// PURPOSE. See the above copyright notice for more information.
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//============================================================================
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#include <vtkm/io/ImageWriterPNM.h>
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#include <vtkm/io/PixelTypes.h>
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namespace vtkm
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{
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namespace io
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{
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ImageWriterPNM::~ImageWriterPNM() noexcept {}
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void ImageWriterPNM::Write(vtkm::Id width, vtkm::Id height, const ColorArrayType& pixels)
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{
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switch (this->Depth)
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{
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case PixelDepth::PIXEL_8:
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this->WriteToFile<vtkm::io::RGBPixel_8>(width, height, pixels);
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break;
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case PixelDepth::PIXEL_16:
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WriteToFile<vtkm::io::RGBPixel_16>(width, height, pixels);
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break;
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}
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}
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template <typename PixelType>
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void ImageWriterPNM::WriteToFile(vtkm::Id width, vtkm::Id height, const ColorArrayType& pixels)
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{
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std::ofstream outStream(this->FileName.c_str(), std::ios_base::binary | std::ios_base::out);
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outStream << "P6\n" << width << " " << height << "\n";
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outStream << PixelType::MAX_COLOR_VALUE << "\n";
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auto pixelPortal = pixels.ReadPortal();
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vtkm::UInt32 imageSize =
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static_cast<vtkm::UInt32>(pixels.GetNumberOfValues() * PixelType::BYTES_PER_PIXEL);
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std::vector<unsigned char> imageData(imageSize);
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// Write out the data starting from the end (Images are stored Bottom-Left to Top-Right,
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// but are viewed from Top-Left to Bottom-Right)
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vtkm::Id pnmIndex = 0;
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for (vtkm::Id yIndex = height - 1; yIndex >= 0; yIndex--)
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{
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for (vtkm::Id xIndex = 0; xIndex < width; xIndex++, pnmIndex++)
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{
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vtkm::Id vtkmIndex = yIndex * width + xIndex;
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PixelType(pixelPortal.Get(vtkmIndex)).FillImageAtIndexWithPixel(imageData.data(), pnmIndex);
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}
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}
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outStream.write((char*)imageData.data(), imageSize);
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outStream.close();
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}
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}
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} // namespace vtkm::io
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