cornerstone-wado-image-loader
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Cornerstone Image Loader for DICOM WADO-URI and WADO-RS
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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#decodeAsync">decodeAsync</a></li><li><a href="global.html#framesAreFragmented">framesAreFragmented</a></li><li><a href="global.html#getMinMax">getMinMax</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#terminate">terminate</a></li><li><a href="global.html#unpackBinaryFrame">unpackBinaryFrame</a></li></ul>
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<h1 class="page-title">webWorker/decodeTask.js</h1>
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<pre class="prettyprint source linenums"><code>import { initialize as initializeJPEG2000 } from '../shared/decoders/decodeJPEG2000.js';
import { initialize as initializeJPEGLS } from '../shared/decoders/decodeJPEGLS.js';
import calculateMinMax from '../shared/calculateMinMax.js';
import decodeImageFrame from '../shared/decodeImageFrame.js';
// the configuration object for the decodeTask
let decodeConfig;
/**
* Function to control loading and initializing the codecs
* @param config
*/
function loadCodecs(config) {
// Initialize the codecs
if (config.decodeTask.initializeCodecsOnStartup) {
console.time('initializeCodecs');
initializeJPEG2000(config.decodeTask);
initializeJPEGLS(config.decodeTask);
console.timeEnd('initializeCodecs');
}
}
/**
* Task initialization function
*/
function initialize(config) {
decodeConfig = config;
loadCodecs(config);
}
/**
* Task handler function
*/
function handler(data, doneCallback) {
// Load the codecs if they aren't already loaded
loadCodecs(decodeConfig);
const strict =
decodeConfig && decodeConfig.decodeTask && decodeConfig.decodeTask.strict;
// convert pixel data from ArrayBuffer to Uint8Array since web workers support passing ArrayBuffers but
// not typed arrays
const pixelData = new Uint8Array(data.data.pixelData);
// TODO switch to promise
function finishedCallback(imageFrame) {
if (!imageFrame.pixelData) {
throw new Error(
'decodeTask: imageFrame.pixelData is undefined after decoding'
);
}
calculateMinMax(imageFrame, strict);
// convert from TypedArray to ArrayBuffer since web workers support passing ArrayBuffers but not
// typed arrays
imageFrame.pixelData = imageFrame.pixelData.buffer;
// invoke the callback with our result and pass the pixelData in the transferList to move it to
// UI thread without making a copy
// ONLY USING setTIMEOUT for TESTING>.. REMOVE THIS
// setTimeout(() => {
doneCallback(imageFrame, [imageFrame.pixelData]);
// }, 100);
}
decodeImageFrame(
data.data.imageFrame,
data.data.transferSyntax,
pixelData,
decodeConfig.decodeTask,
data.data.options,
finishedCallback
);
}
export default {
taskType: 'decodeTask',
handler,
initialize,
};
</code></pre>
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