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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 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 | import getVOILUT from './getVOILut';
import { IImage, CPUFallbackLUT } from '../../../../types';
/**
* Creates a LUT used while rendering to convert stored pixel values to
* display pixels
*
* @param image - A Cornerstone Image Object
* @param windowWidth - The Window Width
* @param windowCenter - The Window Center
* @param invert - A boolean describing whether or not the image has been inverted
* @param voiLUT- A Volume of Interest Lookup Table
*
* @returns A lookup table to apply to the image
*/
export default function generateColorLUT(
image: IImage,
windowWidth: number | number[],
windowCenter: number | number[],
invert: boolean,
voiLUT?: CPUFallbackLUT
) {
const maxPixelValue = image.maxPixelValue;
const minPixelValue = image.minPixelValue;
const offset = Math.min(minPixelValue, 0);
if (image.cachedLut === undefined) {
const length = maxPixelValue - offset + 1;
image.cachedLut = {};
image.cachedLut.lutArray = new Uint8ClampedArray(length);
}
const lut = image.cachedLut.lutArray;
const vlutfn = getVOILUT(
Array.isArray(windowWidth) ? windowWidth[0] : windowWidth,
Array.isArray(windowCenter) ? windowCenter[0] : windowCenter,
voiLUT
);
if (invert === true) {
for (
let storedValue = minPixelValue;
storedValue <= maxPixelValue;
storedValue++
) {
lut[storedValue + -offset] = 255 - vlutfn(storedValue);
}
} else {
for (
let storedValue = minPixelValue;
storedValue <= maxPixelValue;
storedValue++
) {
lut[storedValue + -offset] = vlutfn(storedValue);
}
}
return lut;
}
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