cornerstone-wado-image-loader
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Cornerstone Image Loader for DICOM WADO-URI and WADO-RS
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<title>shared/decoders/decodeJPEGLS.js - Documentation</title>
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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">shared/decoders/decodeJPEGLS.js</h1>
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<pre class="prettyprint source linenums"><code>import charlsFactory from '@cornerstonejs/codec-charls/dist/charlswasm_decode.js';
// import charlsFactory from '@cornerstonejs/codec-charls/dist/debug/charlswasm.js';
// Webpack asset/resource copies this to our output folder
import charlsWasm from '@cornerstonejs/codec-charls/dist/charlswasm_decode.wasm';
// import charlsWasm from '@cornerstonejs/codec-charls/dist/debug/charlswasm.wasm';
const local = {
codec: undefined,
decoder: undefined,
decodeConfig: {},
};
function getExceptionMessage(exception) {
return typeof exception === 'number'
? local.codec.getExceptionMessage(exception)
: exception;
}
export function initialize(decodeConfig) {
local.decodeConfig = decodeConfig;
if (local.codec) {
return Promise.resolve();
}
const charlsModule = charlsFactory({
locateFile: (f) => {
if (f.endsWith('.wasm')) {
return charlsWasm;
}
return f;
},
});
return new Promise((resolve, reject) => {
charlsModule.then((instance) => {
local.codec = instance;
local.decoder = new instance.JpegLSDecoder();
resolve();
}, reject);
});
}
/**
*
* @param {*} compressedImageFrame
* @param {object} imageInfo
* @param {boolean} imageInfo.signed - (pixelRepresentation === 1)
*/
async function decodeAsync(compressedImageFrame, imageInfo) {
try {
await initialize();
const decoder = local.decoder;
// get pointer to the source/encoded bit stream buffer in WASM memory
// that can hold the encoded bitstream
const encodedBufferInWASM = decoder.getEncodedBuffer(
compressedImageFrame.length
);
// copy the encoded bitstream into WASM memory buffer
encodedBufferInWASM.set(compressedImageFrame);
// decode it
decoder.decode();
// get information about the decoded image
const frameInfo = decoder.getFrameInfo();
const interleaveMode = decoder.getInterleaveMode();
const nearLossless = decoder.getNearLossless();
// get the decoded pixels
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,
imageInfo.signed
);
const encodeOptions = {
nearLossless,
interleaveMode,
frameInfo,
};
// local.codec.doLeakCheck();
return {
...imageInfo,
pixelData,
imageInfo: encodedImageInfo,
encodeOptions,
...encodeOptions,
...encodedImageInfo,
};
} catch (error) {
// Handle cases where WASM throws an error internally, and it only gives JS a number
// See https://emscripten.org/docs/porting/Debugging.html#handling-c-exceptions-from-javascript
// TODO: Copy to other codecs as well
throw getExceptionMessage(error);
}
}
function getPixelData(frameInfo, decodedBuffer, signed) {
if (frameInfo.bitsPerSample > 8) {
if (signed) {
return new Int16Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength / 2
);
}
return new Uint16Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength / 2
);
}
if (signed) {
return new Int8Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength
);
}
return new Uint8Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength
);
}
export default decodeAsync;
</code></pre>
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