| 47 | } |
| 48 | |
| 49 | void mitk::CompressedImageContainer::CompressImage(const Image* image) |
| 50 | { |
| 51 | this->ClearCompressedImageData(); |
| 52 | |
| 53 | if (nullptr == image) |
| 54 | return; |
| 55 | |
| 56 | m_PixelType = std::make_unique<PixelType>(image->GetPixelType()); |
| 57 | m_TimeGeometry = image->GetTimeGeometry()->Clone(); |
| 58 | m_SliceDimensions[0] = image->GetDimension(0); |
| 59 | m_SliceDimensions[1] = image->GetDimension(1); |
| 60 | m_Dimension = image->GetDimension(); |
| 61 | |
| 62 | const auto numTimeSteps = m_TimeGeometry->CountTimeSteps(); |
| 63 | const auto numSlices = image->GetDimension(2); |
| 64 | const auto numSliceBytes = image->GetPixelType().GetSize() * image->GetDimension(0) * image->GetDimension(1); |
| 65 | |
| 66 | m_CompressedImageData.reserve(numTimeSteps); |
| 67 | |
| 68 | for (std::remove_const_t<decltype(numTimeSteps)> t = 0; t < numTimeSteps; ++t) |
| 69 | { |
| 70 | CompressedTimeStepData slices; |
| 71 | slices.reserve(numSlices); |
| 72 | |
| 73 | ImageReadAccessor accessor(image, image->GetVolumeData(t)); |
| 74 | |
| 75 | for (std::remove_const_t<decltype(numSlices)> s = 0; s < numSlices; ++s) |
| 76 | { |
| 77 | const auto* src = reinterpret_cast<const char*>(accessor.GetData()) + numSliceBytes * s; |
| 78 | char* dest = new char[numSliceBytes]; |
| 79 | const auto destSize = LZ4_compress_default(src, dest, static_cast<int>(numSliceBytes), static_cast<int>(numSliceBytes)); |
| 80 | |
| 81 | if (0 == destSize) |
| 82 | { |
| 83 | MITK_ERROR << "LZ4 compression failed!"; |
| 84 | delete[] dest; |
| 85 | slices.emplace_back(0, nullptr); |
| 86 | } |
| 87 | else |
| 88 | { |
| 89 | char* shrinkedDest = new char[destSize]; |
| 90 | std::copy(dest, dest + destSize, shrinkedDest); |
| 91 | delete[] dest; |
| 92 | slices.emplace_back(destSize, shrinkedDest); |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | m_CompressedImageData.push_back(slices); |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | mitk::Image::Pointer mitk::CompressedImageContainer::DecompressImage() const |
| 101 | { |