mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
68 lines
2.2 KiB
C++
68 lines
2.2 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/ImageWriterPNG.h>
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#include <vtkm/io/PixelTypes.h>
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VTKM_THIRDPARTY_PRE_INCLUDE
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#include <vtkm/thirdparty/lodepng/vtkmlodepng/lodepng.h>
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VTKM_THIRDPARTY_POST_INCLUDE
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namespace vtkm
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{
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namespace io
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{
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ImageWriterPNG::~ImageWriterPNG() noexcept {}
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void ImageWriterPNG::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 ImageWriterPNG::WriteToFile(vtkm::Id width, vtkm::Id height, const ColorArrayType& pixels)
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{
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auto pixelPortal = pixels.ReadPortal();
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std::vector<unsigned char> imageData(static_cast<typename std::vector<unsigned char>::size_type>(
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pixels.GetNumberOfValues() * PixelType::BYTES_PER_PIXEL));
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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 pngIndex = 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++)
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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(), pngIndex);
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pngIndex++;
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}
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}
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vtkm::png::lodepng_encode_file(this->FileName.c_str(),
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imageData.data(),
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static_cast<unsigned>(width),
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static_cast<unsigned>(height),
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PixelType::PNG_COLOR_TYPE,
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PixelType::BIT_DEPTH);
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}
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}
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} // namespace vtkm::io
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