@cleerlycode/cornerstone-wado-image-loader
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Cornerstone ImageLoader for DICOM WADO-URI
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<h2><a href="index.html">Home</a></h2><h3>Global</h3><ul><li><a href="global.html#addTask">addTask</a></li><li><a href="global.html#arrayBufferToString">arrayBufferToString</a></li><li><a href="global.html#cacheSizeInBytes">cacheSizeInBytes</a></li><li><a href="global.html#cancelTask">cancelTask</a></li><li><a href="global.html#framesAreFragmented">framesAreFragmented</a></li><li><a href="global.html#getNumberString">getNumberString</a></li><li><a href="global.html#getNumberValues">getNumberValues</a></li><li><a href="global.html#getStatistics">getStatistics</a></li><li><a href="global.html#getTransferSyntaxForContentType">getTransferSyntaxForContentType</a></li><li><a href="global.html#getUncompressedImageFrame">getUncompressedImageFrame</a></li><li><a href="global.html#getValue">getValue</a></li><li><a href="global.html#handleMessageFromWorker">handleMessageFromWorker</a></li><li><a href="global.html#handler">handler</a></li><li><a href="global.html#initialize">initialize</a></li><li><a href="global.html#loadCodecs">loadCodecs</a></li><li><a href="global.html#loadWebWorkerTask">loadWebWorkerTask</a></li><li><a href="global.html#registerLoaders">registerLoaders</a></li><li><a href="global.html#registerTaskHandler">registerTaskHandler</a></li><li><a href="global.html#setPixelDataType">setPixelDataType</a></li><li><a href="global.html#setTaskPriority">setTaskPriority</a></li><li><a href="global.html#spawnWebWorker">spawnWebWorker</a></li><li><a href="global.html#startTaskOnWebWorker">startTaskOnWebWorker</a></li><li><a href="global.html#unpackBinaryFrame">unpackBinaryFrame</a></li></ul>
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<h1 class="page-title">imageLoader/wadors/loadImage.js</h1>
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<pre class="prettyprint source linenums"><code>import metaDataManager from './metaDataManager.js';
import getPixelData from './getPixelData.js';
import createImage from '../createImage.js';
/**
* Helper method to extract the transfer-syntax from the response of the server.
* @param {string} contentType The value of the content-type header as returned by the WADO-RS server.
* @return The transfer-syntax as announced by the server, or Implicit Little Endian by default.
*/
export function getTransferSyntaxForContentType (contentType) {
let transferSyntax = '1.2.840.10008.1.2'; // Default is Implicit Little Endian.
if (contentType) {
// Browse through the content type parameters
const parameters = contentType.split(';');
for (const parameterIndex in parameters) {
let parameter = parameters[parameterIndex];
// Look for a transfer-syntax=XXXX pair
const parameterValues = parameter.split('=');
if (parameterValues.length !== 2) {
continue;
}
if (parameterValues[0].trim() === 'transfer-syntax') {
transferSyntax = parameterValues[1].trim() || transferSyntax;
}
}
}
return transferSyntax;
}
function loadImage (imageId, options) {
const start = new Date().getTime();
const uri = imageId.substring(7);
const promise = new Promise((resolve, reject) => {
// check to make sure we have metadata for this imageId
const metaData = metaDataManager.get(imageId);
if (metaData === undefined) {
const error = new Error(`no metadata for imageId ${imageId}`);
return reject(error);
}
// TODO: load bulk data items that we might need
const mediaType = 'multipart/related; type="application/octet-stream"'; // 'image/dicom+jp2';
// get the pixel data from the server
getPixelData(uri, imageId, mediaType).then((result) => {
const transferSyntax = getTransferSyntaxForContentType(result.contentType);
const pixelData = result.imageFrame.pixelData;
const imagePromise = createImage(imageId, pixelData, transferSyntax, options);
imagePromise.then((image) => {
// add the loadTimeInMS property
const end = new Date().getTime();
image.loadTimeInMS = end - start;
resolve(image);
}, reject);
}, reject);
});
return {
promise,
cancelFn: undefined
};
}
export default loadImage;
</code></pre>
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