mirror of
https://gitlab.kitware.com/vtk/vtk-m
synced 2024-09-08 13:23:51 +00:00
81 lines
2.3 KiB
C++
81 lines
2.3 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/ImageReaderPNG.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
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{
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VTKM_CONT
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template <typename PixelType>
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vtkm::io::ImageReaderBase::ColorArrayType ReadFromPNG(const std::string& fileName,
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vtkm::Id& width,
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vtkm::Id& height)
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{
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unsigned char* imageData;
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unsigned uwidth, uheight;
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vtkm::png::lodepng_decode_file(
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&imageData,
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&uwidth,
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&uheight,
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fileName.c_str(),
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static_cast<vtkm::png::LodePNGColorType>(PixelType::GetColorType()),
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PixelType::GetBitDepth());
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width = static_cast<vtkm::Id>(uwidth);
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height = static_cast<vtkm::Id>(uheight);
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// Fill in the data starting from the end (Images are read Top-Left to Bottom-Right,
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// but are stored from Bottom-Left to Top-Right)
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vtkm::cont::ArrayHandle<vtkm::Vec4f_32> array;
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array.Allocate(width * height);
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auto portal = array.WritePortal();
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vtkm::Id vtkmIndex = 0;
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for (vtkm::Id yIndex = static_cast<vtkm::Id>(height - 1); yIndex >= 0; yIndex--)
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{
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for (vtkm::Id xIndex = 0; xIndex < static_cast<vtkm::Id>(width); xIndex++)
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{
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vtkm::Id pngIndex = static_cast<vtkm::Id>(yIndex * width + xIndex);
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portal.Set(vtkmIndex, PixelType(imageData, pngIndex).ToVec4f());
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vtkmIndex++;
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}
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}
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free(imageData);
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return array;
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}
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} // anonymous namespace
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namespace vtkm
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{
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namespace io
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{
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ImageReaderPNG::~ImageReaderPNG() noexcept {}
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void ImageReaderPNG::Read()
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{
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vtkm::Id width;
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vtkm::Id height;
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vtkm::io::ImageReaderBase::ColorArrayType pixelArray =
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ReadFromPNG<vtkm::io::RGBPixel_16>(this->FileName, width, height);
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this->InitializeImageDataSet(width, height, pixelArray);
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}
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}
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} // namespace vtkm::io
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