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import { metaData, type Types } from '@cornerstonejs/core';
function convertLUTto8Bit(lut: number[], shift: number) {
const numEntries = lut.length;
const cleanedLUT = new Uint8ClampedArray(numEntries);
for (let i = 0; i < numEntries; ++i) {
cleanedLUT[i] = lut[i] >> shift;
}
return cleanedLUT;
}
function fetchPaletteData(imageFrame, color, fallback) {
const data = imageFrame[`${color}PaletteColorLookupTableData`];
Eif (data) {
return Promise.resolve(data);
}
const result = metaData.get('imagePixelModule', imageFrame.imageId);
if (result && typeof result.then === 'function') {
return result.then((module) =>
module ? module[`${color}PaletteColorLookupTableData`] : fallback
);
} else {
return Promise.resolve(
result ? result[`${color}PaletteColorLookupTableData`] : fallback
);
}
}
/**
* Convert pixel data with PALETTE COLOR Photometric Interpretation to RGBA
*
* @param imageFrame - The ImageFrame to convert
* @param colorBuffer - The buffer to write the converted pixel data to
* @returns
*/
export default function (
imageFrame: Types.IImageFrame,
colorBuffer: ByteArray,
useRGBA: boolean
): void {
const numPixels = imageFrame.columns * imageFrame.rows;
const pixelData = imageFrame.pixelData;
Promise.all([
fetchPaletteData(imageFrame, 'red', null),
fetchPaletteData(imageFrame, 'green', null),
fetchPaletteData(imageFrame, 'blue', null),
]).then(([rData, gData, bData]) => {
Iif (!rData || !gData || !bData) {
throw new Error(
'The image does not have a complete color palette. R, G, and B palette data are required.'
);
}
const len = rData.length;
let palIndex = 0;
let bufferIndex = 0;
const start = imageFrame.redPaletteColorLookupTableDescriptor[1];
const shift =
imageFrame.redPaletteColorLookupTableDescriptor[2] === 8 ? 0 : 8;
const rDataCleaned = convertLUTto8Bit(rData, shift);
const gDataCleaned = convertLUTto8Bit(gData, shift);
const bDataCleaned = convertLUTto8Bit(bData, shift);
Iif (useRGBA) {
for (let i = 0; i < numPixels; ++i) {
let value = pixelData[palIndex++];
if (value < start) {
value = 0;
} else if (value > start + len - 1) {
value = len - 1;
} else {
value -= start;
}
colorBuffer[bufferIndex++] = rDataCleaned[value];
colorBuffer[bufferIndex++] = gDataCleaned[value];
colorBuffer[bufferIndex++] = bDataCleaned[value];
colorBuffer[bufferIndex++] = 255;
}
return;
}
for (let i = 0; i < numPixels; ++i) {
let value = pixelData[palIndex++];
Iif (value < start) {
value = 0;
} else Iif (value > start + len - 1) {
value = len - 1;
} else {
value -= start;
}
colorBuffer[bufferIndex++] = rDataCleaned[value];
colorBuffer[bufferIndex++] = gDataCleaned[value];
colorBuffer[bufferIndex++] = bDataCleaned[value];
}
});
}
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