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// dicomParser requires pako for browser-side decoding of deflate transfer syntax
// We only need one function though, so lets import that so we don't make our bundle
// too large.
import type { ByteArray } from 'dicom-parser';
import type { Types } from '@cornerstonejs/core';
import { getWebWorkerManager } from '@cornerstonejs/core';
import type { LoaderDecodeOptions } from '../types';
function processDecodeTask(
imageFrame: Types.IImageFrame,
transferSyntax: string,
pixelData: ByteArray,
srcOptions,
decodeConfig: LoaderDecodeOptions
): Promise<Types.IImageFrame> {
const options = { ...srcOptions };
// If a loader is specified, it can't be passed through because it is a function
// and can't be safely cloned/copied externally.
delete options.loader;
// Similarly, the streamData may contain larger data information and
// although it can be passed to the decoder, it isn't needed and is slow
delete options.streamingData;
const webWorkerManager = getWebWorkerManager();
const priority = options.priority || undefined;
const transferList = options.transferPixelData
? [pixelData.buffer]
: undefined;
return webWorkerManager.executeTask(
'dicomImageLoader',
'decodeTask',
{
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig,
},
{
priority,
requestType: options?.requestType,
}
);
}
function decodeImageFrame(
imageFrame,
transferSyntax,
pixelData,
canvas,
options = {},
decodeConfig
) {
switch (transferSyntax) {
case '1.2.840.10008.1.2':
// Implicit VR Little Endian
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.1':
// Explicit VR Little Endian
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.2':
// Explicit VR Big Endian (retired)
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.1.99':
// Deflate transfer syntax (deflated by dicomParser)
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.5':
// RLE Lossless
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.50':
// JPEG Baseline lossy process 1 (8 bit)
// Handle 8-bit JPEG Baseline color images using the browser's built-in
// JPEG decoding
if (
imageFrame.bitsAllocated === 8 &&
(imageFrame.samplesPerPixel === 3 || imageFrame.samplesPerPixel === 4)
) {
return decodeJPEGBaseline8BitColor(imageFrame, pixelData, canvas);
}
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.51':
// JPEG Baseline lossy process 2 & 4 (12 bit)
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.57':
// JPEG Lossless, Nonhierarchical (Processes 14)
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.70':
// JPEG Lossless, Nonhierarchical (Processes 14 [Selection 1])
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.80':
// JPEG-LS Lossless Image Compression
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.81':
// JPEG-LS Lossy (Near-Lossless) Image Compression
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.90':
// JPEG 2000 Lossless
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '1.2.840.10008.1.2.4.91':
// JPEG 2000 Lossy
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
case '3.2.840.10008.1.2.4.96':
case '1.2.840.10008.1.2.4.201':
case '1.2.840.10008.1.2.4.202':
case '1.2.840.10008.1.2.4.203':
// HTJ2K
return processDecodeTask(
imageFrame,
transferSyntax,
pixelData,
options,
decodeConfig
);
}
/* Don't know if these work...
// JPEG 2000 Part 2 Multicomponent Image Compression (Lossless Only)
else if(transferSyntax === "1.2.840.10008.1.2.4.92")
{
return cornerstoneDICOMImageLoader.decodeJPEG2000(dataSet, frame);
}
// JPEG 2000 Part 2 Multicomponent Image Compression
else if(transferSyntax === "1.2.840.10008.1.2.4.93")
{
return cornerstoneDICOMImageLoader.decodeJPEG2000(dataSet, frame);
}
*/
return Promise.reject(
new Error(`No decoder for transfer syntax ${transferSyntax}`)
);
}
export default decodeImageFrame;
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