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/decodeHTJ2K.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#decodeImageFrame">decodeImageFrame</a></li><li><a href="global.html#extractOrientationFromDataset">extractOrientationFromDataset</a></li><li><a href="global.html#extractOrientationFromMetadata">extractOrientationFromMetadata</a></li><li><a href="global.html#extractOrientationFromNMMultiframeDataset">extractOrientationFromNMMultiframeDataset</a></li><li><a href="global.html#extractOrientationFromNMMultiframeMetadata">extractOrientationFromNMMultiframeMetadata</a></li><li><a href="global.html#extractPositionFromDataset">extractPositionFromDataset</a></li><li><a href="global.html#extractPositionFromMetadata">extractPositionFromMetadata</a></li><li><a href="global.html#extractPositionFromNMMultiframeDataset">extractPositionFromNMMultiframeDataset</a></li><li><a href="global.html#extractPositionFromNMMultiframeMetadata">extractPositionFromNMMultiframeMetadata</a></li><li><a href="global.html#extractSliceThicknessFromDataset">extractSliceThicknessFromDataset</a></li><li><a href="global.html#extractSpacingFromDataset">extractSpacingFromDataset</a></li><li><a href="global.html#framesAreFragmented">framesAreFragmented</a></li><li><a href="global.html#getImageTypeSubItemFromDataset">getImageTypeSubItemFromDataset</a></li><li><a href="global.html#getImageTypeSubItemFromMetadata">getImageTypeSubItemFromMetadata</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#removeAFromRGBA">removeAFromRGBA</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/decodeHTJ2K.js</h1>
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<pre class="prettyprint source linenums"><code>// https://emscripten.org/docs/api_reference/module.html
//import openJphFactory from '@cornerstonejs/codec-openjph';
// Webpack asset/resource copies this to our output folder
//import openjphWasm from '@cornerstonejs/codec-openjph/wasm';
// import openJphFactory from '../../../codecs/openjphjs.js';
// import openjphWasm from '../../../codecs/openjphjs.wasm';
import openJphFactory from '@cornerstonejs/codec-openjph/wasmjs';
import openjphWasm from '@cornerstonejs/codec-openjph/wasm';
const local = {
codec: undefined,
decoder: undefined,
decodeConfig: {},
};
export function initialize(decodeConfig) {
local.decodeConfig = decodeConfig;
if (local.codec) {
return Promise.resolve();
}
const openJphModule = openJphFactory({
locateFile: (f) => {
if (f.endsWith('.wasm')) {
return openjphWasm;
}
return f;
},
});
return new Promise((resolve, reject) => {
openJphModule.then((instance) => {
local.codec = instance;
local.decoder = new instance.HTJ2KDecoder();
resolve();
}, reject);
});
}
// https://github.com/chafey/openjpegjs/blob/master/test/browser/index.html
async function decodeAsync(compressedImageFrame, imageInfo) {
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();
// decoder.decodeSubResolution(decodeLevel, decodeLayer);
// const resolutionAtLevel = decoder.calculateSizeAtDecompositionLevel(decodeLevel);
// get information about the decoded image
const frameInfo = decoder.getFrameInfo();
// get the decoded pixels
const decodedBufferInWASM = decoder.getDecodedBuffer();
const imageFrame = new Uint8Array(decodedBufferInWASM.length);
imageFrame.set(decodedBufferInWASM);
const imageOffset = `x: ${decoder.getImageOffset().x}, y: ${
decoder.getImageOffset().y
}`;
const numDecompositions = decoder.getNumDecompositions();
const numLayers = decoder.getNumLayers();
const progessionOrder = ['unknown', 'LRCP', 'RLCP', 'RPCL', 'PCRL', 'CPRL'][
decoder.getProgressionOrder() + 1
];
const reversible = decoder.getIsReversible();
const blockDimensions = `${decoder.getBlockDimensions().width} x ${
decoder.getBlockDimensions().height
}`;
const tileSize = `${decoder.getTileSize().width} x ${
decoder.getTileSize().height
}`;
const tileOffset = `${decoder.getTileOffset().x}, ${
decoder.getTileOffset().y
}`;
// const colorTransform = decoder.getColorSpace();
const decodedSize = `${decodedBufferInWASM.length.toLocaleString()} bytes`;
const compressionRatio = `${(
decodedBufferInWASM.length / encodedBufferInWASM.length
).toFixed(2)}:1`;
const encodedImageInfo = {
columns: frameInfo.width,
rows: frameInfo.height,
bitsPerPixel: frameInfo.bitsPerSample,
signed: frameInfo.isSigned,
bytesPerPixel: imageInfo.bytesPerPixel,
componentsPerPixel: frameInfo.componentCount,
};
// const pixelData = getPixelData(frameInfo, decodedBufferInWASM);
/**
* Have to truncate the arraybuffer here to the length of the typed array. Not
* sure why the arraybuffer is so huge, maybe this is allocated by the WASM
* module? In any case, I think it's too big to postMessage in it's entirety.
*/
let pixelData = getPixelData(frameInfo, decodedBufferInWASM);
const { buffer: b, byteOffset, byteLength } = pixelData;
const pixelDataArrayBuffer = b.slice(byteOffset, byteOffset + byteLength);
pixelData = new pixelData.constructor(pixelDataArrayBuffer);
const encodeOptions = {
imageOffset,
numDecompositions,
numLayers,
progessionOrder,
reversible,
blockDimensions,
tileSize,
tileOffset,
// colorTransform,
decodedSize,
compressionRatio,
};
return {
...imageInfo,
pixelData,
imageInfo: encodedImageInfo,
encodeOptions,
...encodeOptions,
...encodedImageInfo,
};
}
function getPixelData(frameInfo, decodedBuffer) {
if (frameInfo.bitsPerSample > 8) {
if (frameInfo.isSigned) {
return new Int16Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength / 2
);
}
return new Uint16Array(
decodedBuffer.buffer,
decodedBuffer.byteOffset,
decodedBuffer.byteLength / 2
);
}
if (frameInfo.isSigned) {
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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