@cornerstonejs/dicom-image-loader
Version:
Cornerstone Image Loader for DICOM WADO-URI and WADO-RS and Local file
65 lines (64 loc) • 2.18 kB
JavaScript
import libjpegTurboFactory from '@cornerstonejs/codec-libjpeg-turbo-8bit/decodewasmjs';
const libjpegTurboWasm = new URL('@cornerstonejs/codec-libjpeg-turbo-8bit/decodewasm', import.meta.url);
const local = {
codec: undefined,
decoder: undefined,
};
function initLibjpegTurbo() {
if (local.codec) {
return Promise.resolve();
}
const libjpegTurboModule = libjpegTurboFactory({
locateFile: (f) => {
if (f.endsWith('.wasm')) {
return libjpegTurboWasm.toString();
}
return f;
},
});
return new Promise((resolve, reject) => {
libjpegTurboModule.then((instance) => {
local.codec = instance;
local.decoder = new instance.JPEGDecoder();
resolve();
}, reject);
});
}
async function decodeAsync(compressedImageFrame, imageInfo) {
await initLibjpegTurbo();
const decoder = local.decoder;
const encodedBufferInWASM = decoder.getEncodedBuffer(compressedImageFrame.length);
encodedBufferInWASM.set(compressedImageFrame);
decoder.decode();
const frameInfo = decoder.getFrameInfo();
const decodedPixelsInWASM = decoder.getDecodedBuffer();
const encodedImageInfo = {
columns: frameInfo.width,
rows: frameInfo.height,
bitsPerPixel: frameInfo.bitsPerSample,
signed: imageInfo.signed,
bytesPerPixel: imageInfo.bytesPerPixel,
componentsPerPixel: frameInfo.componentCount,
};
const pixelData = getPixelData(frameInfo, decodedPixelsInWASM);
const encodeOptions = {
frameInfo,
};
return {
...imageInfo,
pixelData,
imageInfo: encodedImageInfo,
encodeOptions,
...encodeOptions,
...encodedImageInfo,
};
}
function getPixelData(frameInfo, decodedBuffer) {
if (frameInfo.isSigned) {
return new Int8Array(decodedBuffer.buffer, decodedBuffer.byteOffset, decodedBuffer.byteLength);
}
return new Uint8Array(decodedBuffer.buffer, decodedBuffer.byteOffset, decodedBuffer.byteLength);
}
const initialize = initLibjpegTurbo;
export { initialize };
export default decodeAsync;