Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import type { Types } from '@cornerstonejs/core';
import type { WebWorkerDecodeConfig } from '../../types';
const local = {
DecoderClass: undefined,
decodeConfig: {} as WebWorkerDecodeConfig,
};
export function initialize(
decodeConfig?: WebWorkerDecodeConfig
): Promise<void> {
local.decodeConfig = decodeConfig;
if (local.DecoderClass) {
return Promise.resolve();
}
return new Promise((resolve, reject) => {
import('jpeg-lossless-decoder-js').then(({ Decoder }) => {
local.DecoderClass = Decoder;
resolve();
}, reject);
});
}
async function decodeJPEGLossless(
imageFrame: Types.IImageFrame,
pixelData: ByteArray
): Promise<Types.IImageFrame> {
await initialize();
// check to make sure codec is loaded
if (typeof local.DecoderClass === 'undefined') {
throw new Error('No JPEG Lossless decoder loaded');
}
// Create a new decoder instance for each decode operation to ensure thread safety
const decoder = new local.DecoderClass();
const byteOutput = imageFrame.bitsAllocated <= 8 ? 1 : 2;
const buffer = pixelData.buffer;
const decompressedData = decoder.decode(
buffer,
pixelData.byteOffset,
pixelData.length,
byteOutput
);
if (imageFrame.pixelRepresentation === 0) {
if (imageFrame.bitsAllocated === 16) {
imageFrame.pixelData = new Uint16Array(decompressedData.buffer);
return imageFrame;
}
// untested!
imageFrame.pixelData = new Uint8Array(decompressedData.buffer);
return imageFrame;
}
imageFrame.pixelData = new Int16Array(decompressedData.buffer);
return imageFrame;
}
export default decodeJPEGLossless;
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