e8c5ee5e69
Selecting the pixel type just means that lodepng casts it to that type for it then to be cast to the type VTK-m uses. Since VTK-m always uses the same type, there is little value for changing the intermediate cast.
78 lines
2.3 KiB
C++
78 lines
2.3 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/ImageReaderPNG.h>
|
|
|
|
#include <vtkm/io/PixelTypes.h>
|
|
|
|
namespace
|
|
{
|
|
|
|
VTKM_CONT
|
|
template <typename PixelType>
|
|
vtkm::io::ImageReaderBase::ColorArrayType ReadFromPNG(const std::string& fileName,
|
|
vtkm::Id& width,
|
|
vtkm::Id& height)
|
|
{
|
|
unsigned char* imageData;
|
|
unsigned uwidth, uheight;
|
|
vtkm::png::lodepng_decode_file(&imageData,
|
|
&uwidth,
|
|
&uheight,
|
|
fileName.c_str(),
|
|
PixelType::PNG_COLOR_TYPE,
|
|
PixelType::BIT_DEPTH);
|
|
|
|
width = static_cast<vtkm::Id>(uwidth);
|
|
height = static_cast<vtkm::Id>(uheight);
|
|
|
|
// Fill in the data starting from the end (Images are read Top-Left to Bottom-Right,
|
|
// but are stored from Bottom-Left to Top-Right)
|
|
vtkm::cont::ArrayHandle<vtkm::Vec4f_32> array;
|
|
array.Allocate(width * height);
|
|
auto portal = array.WritePortal();
|
|
vtkm::Id vtkmIndex = 0;
|
|
for (vtkm::Id yIndex = static_cast<vtkm::Id>(height - 1); yIndex >= 0; yIndex--)
|
|
{
|
|
for (vtkm::Id xIndex = 0; xIndex < static_cast<vtkm::Id>(width); xIndex++)
|
|
{
|
|
vtkm::Id pngIndex = static_cast<vtkm::Id>(yIndex * width + xIndex);
|
|
portal.Set(vtkmIndex, PixelType(imageData, pngIndex).ToVec4f());
|
|
vtkmIndex++;
|
|
}
|
|
}
|
|
|
|
free(imageData);
|
|
return array;
|
|
}
|
|
|
|
} // anonymous namespace
|
|
|
|
namespace vtkm
|
|
{
|
|
namespace io
|
|
{
|
|
|
|
ImageReaderPNG::~ImageReaderPNG() noexcept
|
|
{
|
|
}
|
|
|
|
void ImageReaderPNG::Read()
|
|
{
|
|
vtkm::Id width;
|
|
vtkm::Id height;
|
|
vtkm::io::ImageReaderBase::ColorArrayType pixelArray =
|
|
ReadFromPNG<vtkm::io::RGBPixel_16>(this->FileName, width, height);
|
|
|
|
this->InitializeImageDataSet(width, height, pixelArray);
|
|
}
|
|
}
|
|
} // namespace vtkm::io
|