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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 | import type { ByteArray } from 'dicom-parser';
import type { Types } from '@cornerstonejs/core';
/* eslint no-bitwise: 0 */
function swap16(val) {
return ((val & 0xff) << 8) | ((val >> 8) & 0xff);
}
async function decodeBigEndian(
imageFrame: Types.IImageFrame,
pixelData: ByteArray
): Promise<Types.IImageFrame> {
if (imageFrame.bitsAllocated === 16) {
let arrayBuffer = pixelData.buffer;
let offset = pixelData.byteOffset;
const length = pixelData.length;
// if pixel data is not aligned on even boundary, shift it so we can create the 16 bit array
// buffers on it
if (offset % 2) {
arrayBuffer = arrayBuffer.slice(offset);
offset = 0;
}
if (imageFrame.pixelRepresentation === 0) {
imageFrame.pixelData = new Uint16Array(arrayBuffer, offset, length / 2);
} else {
imageFrame.pixelData = new Int16Array(arrayBuffer, offset, length / 2);
}
// Do the byte swap
for (let i = 0; i < imageFrame.pixelData.length; i++) {
imageFrame.pixelData[i] = swap16(imageFrame.pixelData[i]);
}
} else if (imageFrame.bitsAllocated === 8) {
imageFrame.pixelData = pixelData;
}
return imageFrame;
}
export default decodeBigEndian;
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