fix(WebAssemblyInterface): support vector/multi-component images

include/itkImageToWasmImageFilter.hxx

@@ -138,8 +138,9 @@ ImageToWasmImageFilter<TImage>
   imageJSON->SetImage(image);
 
   using PointType = typename TImage::PointType;
-  using PixelType = typename TImage::IOPixelType;
-  using ConvertPixelTraits = DefaultConvertPixelTraits<PixelType>;
+  using PixelType = typename TImage::PixelType;
+  using IOPixelType = typename TImage::IOPixelType;
+  using ConvertPixelTraits = DefaultConvertPixelTraits<IOPixelType>;
   using ComponentType = typename ConvertPixelTraits::ComponentType;
 
   rapidjson::Document document;
@@ -160,7 +161,7 @@ ImageToWasmImageFilter<TImage>
   pixelType.SetString( wasm::MapPixelType<PixelType>::PixelString.data(), allocator );
   imageType.AddMember("pixelType", pixelType.Move(), allocator );
 
-  imageType.AddMember("components", rapidjson::Value( ConvertPixelTraits::GetNumberOfComponents() ).Move(), allocator );
+  imageType.AddMember("components", rapidjson::Value( image->GetNumberOfComponentsPerPixel() ).Move(), allocator );
 
   document.AddMember( "imageType", imageType.Move(), allocator );
 

include/itkOutputImage.h

@@ -84,7 +84,7 @@ class ITK_TEMPLATE_EXPORT OutputImage
 
         const auto dataAddress = reinterpret_cast< size_t >( wasmImage->GetImage()->GetBufferPointer() );
         using ConvertPixelTraits = DefaultConvertPixelTraits<typename ImageType::PixelType>;
-        const auto dataSize = wasmImage->GetImage()->GetPixelContainer()->Size() * sizeof(typename ConvertPixelTraits::ComponentType) * ConvertPixelTraits::GetNumberOfComponents();
+        const auto dataSize = wasmImage->GetImage()->GetPixelContainer()->Size() * sizeof(typename ConvertPixelTraits::ComponentType);
         setMemoryStoreOutputArray(0, index, 0, dataAddress, dataSize);
 
         const auto directionAddress = reinterpret_cast< size_t >( wasmImage->GetImage()->GetDirection().GetVnlMatrix().begin() );

packages/core/typescript/itk-wasm/src/cli/default-image-tag.js

@@ -1,2 +1,2 @@
-const defaultImageTag = '20240605-0b83f08b'
+const defaultImageTag = '20240624-b89bcb6c'
 export default defaultImageTag

test/CMakeLists.txt

@@ -56,6 +56,7 @@ ExternalData_Expand_Arguments(
 
 set(WebAssemblyInterfaceTests
   itkWasmImageInterfaceTest.cxx
+  itkWasmVectorImageInterfaceTest.cxx
   itkWasmImageInterfaceWithNegativeIndexTest.cxx
   itkWasmMeshInterfaceTest.cxx
   itkWasmPolyDataInterfaceTest.cxx
@@ -87,6 +88,15 @@ itk_add_test(NAME itkWasmImageInterfaceTest
       ${ITK_TEST_OUTPUT_DIR}/itkWasmImageInterfaceTest.mha
 )
 
+itk_add_test(NAME itkWasmVectorImageInterfaceTest
+    COMMAND WebAssemblyInterfaceTestDriver
+      --compare DATA{Input/apple.jpg}
+      ${ITK_TEST_OUTPUT_DIR}/itkWasmVectorImageInterfaceTest.mha
+    itkWasmVectorImageInterfaceTest
+      DATA{Input/apple.jpg}
+      ${ITK_TEST_OUTPUT_DIR}/itkWasmVectorImageInterfaceTest.mha
+)
+
 itk_add_test(NAME itkWasmImageInterfaceWithNegativeIndexTest
         COMMAND WebAssemblyInterfaceTestDriver
         --compare DATA{Baseline/negative_idx_padded.mha}

test/itkWasmVectorImageInterfaceTest.cxx

@@ -0,0 +1,64 @@
+/*=========================================================================
+ *
+ *  Copyright NumFOCUS
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *         https://www.apache.org/licenses/LICENSE-2.0.txt
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ *
+ *=========================================================================*/
+#include "itkImageToWasmImageFilter.h"
+#include "itkWasmImageToImageFilter.h"
+
+#include "itkImageFileReader.h"
+#include "itkImageFileWriter.h"
+#include "itkTestingMacros.h"
+
+int
+itkWasmVectorImageInterfaceTest(int argc, char * argv[])
+{
+  if (argc < 3)
+  {
+    std::cerr << "Missing parameters" << std::endl;
+    std::cerr << "Usage: " << itkNameOfTestExecutableMacro(argv) << " InputImage OutputImage" << std::endl;
+    return EXIT_FAILURE;
+  }
+  const char * inputImageFile = argv[1];
+  const char * outputImageFile = argv[2];
+
+  constexpr unsigned int Dimension = 2;
+  using PixelType = unsigned char;
+  using ImageType = itk::VectorImage<PixelType, Dimension>;
+  using ImagePointer = ImageType::Pointer;
+
+  ImagePointer inputImage = nullptr;
+  ITK_TRY_EXPECT_NO_EXCEPTION(inputImage = itk::ReadImage<ImageType>(inputImageFile));
+  std::cout << "inputImage: " << inputImage << std::endl;
+
+  using ImageToWasmImageFilterType = itk::ImageToWasmImageFilter<ImageType>;
+  auto imageToJSON = ImageToWasmImageFilterType::New();
+  imageToJSON->SetInput(inputImage);
+  imageToJSON->Update();
+  auto imageJSON = imageToJSON->GetOutput();
+  std::cout << "Image JSON: " << imageJSON->GetJSON() << std::endl;
+
+  using WasmImageToImageFilterType = itk::WasmImageToImageFilter<ImageType>;
+  auto jsonToImage = WasmImageToImageFilterType::New();
+  jsonToImage->SetInput(imageToJSON->GetOutput());
+  jsonToImage->Update();
+  ImageType::Pointer convertedImage = jsonToImage->GetOutput();
+
+  std::cout << "convertedImage: " << convertedImage << std::endl;
+
+  ITK_TRY_EXPECT_NO_EXCEPTION(itk::WriteImage(convertedImage, outputImageFile));
+
+  return EXIT_SUCCESS;
+}